781575

(Scloo Atomic Energy Levels—The Rare-Earth Elements

The Spectra of Lanthanum, Cerium, Praseodymium,

Neodymium, Promethium, Samarium, Europium,

Gadolinium, Terbium, Dysprosium, Holmium, Erbium,

Thulium, Ytterbium, and Lutetium

W.C. Martin, Romuald Zalubas, and Lucy Hagan

Institute for Basic Standards

National Bureau of Standards

Washington, D.C. 20234

- fr&S ) i

U.S. DEPARTMENT OF COMMERCE, Juanita M. Kreps, Secretary

Dr. Sidney Harman, Under Secretary

Jordan J. Baruch, Assistant Secretary for Science and Technology

NATIONAL BUREAU OF STANDARDS, Ernest Ambler, Director

l *

t Issued April 1978
Library of Congress Cataloging in Publication Data

Martin, William Clyde, 1 929- Atom ic energy levels—the rare-earth elements.

(Nat. stand, ref. data ser. ; NSRDS-NBS 60) “National Standard Reference Data System.”

Supt. of Docs, no.: C13.48:60

1. Earths, Rare—Spectra—Tables. 2. Atomic spectra—Tables, etc.

3. Energy levels (Quantum mechanics)—Tables, etc. I. Zalubas, Romuald, joint author. II Hagan, Lucy, joint author. III. Title. IV.

Series: United States. National Bureau of Standards. National stan- dard reference data series ; NSRDS-NBS 60. QCIOO.U573 no. 60 [QC462.R2] 602’. Is [539. 7’2] 77-12195 NSRDS-NBS 60

Nat. Stand. Ref. Data Ser., Nat. Bur. Stand. (U.S.), 60, 422 pages (April 1978) CODEN: NSRDAP

©1978 by the Secretary of Commerce on Behalf of the United States Government

U S. GOVERNMENT PRINTING OFFICE

WASHINGTON: 1978

For sale by the Superintendent of Documents, U.S. Government Printing Office, Washington, D.C. 20402

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Foreword

The National Standard Reference Data System provides access to the quantitative data of physical science, critically evaluated and compiled for convenience and readily accessible through a

variety of distribution channels. The System was established in 1963 by action of the President’s

Office of Science and Technology and the Federal Council for Science and Technology, and

responsibility to administer it was assigned to the National Bureau of Standards.

NSRDS receives advice and planning assistance from a Review Committee of the National

Research Council of the National Academy of Sciences-National Academy of Engineering. A number of Advisory Panels, each concerned with a single technical area, meet regularly to examine

major portions of the program, assign relative priorities, and identify specific key problems in need of further attention. For selected specific topics, the Advisory Panels sponsor subpanels

which make detailed studies of users’ needs, the present state of knowledge, and existing data re- sources as a basis for recommending one or more data compilation activities. This assembly of advisory services contributes greatly to the guidance of NSRDS activities. The System now includes a complex of data centers and other activities in academic insti- tutions and other laboratories. Components of the NSRDS produce compilations of critically evaluated data, reviews of the state of quantitative knowledge in specialized areas, and computations of useful functions derived from standard reference data. The centers and projects also establish criteria for evaluation and compilation of data and recommend improvements in ex- perimental techniques. They are normally associated with research in the relevant field. The technical scope of NSRDS is indicated by the categories of projects active or being

planned: nuclear properties, atomic and molecular properties, solid state properties, thermodynamic and transport properties, chemical kinetics, and colloid and surface properties. Reliable data on the properties of matter and materials are a major foundation of scientific and technical progress. Such important activities as basic scientific research, industrial quality control, development of new materials for building and other technologies, measuring and correcting

environmental pollution depend on quality reference data. In NSRDS, the Bureau’s responsibility

to support American science, industry, and commerce is vitally fulfilled.

Ernest Ambler, Director

iii
Preface

The program on Atomic Energy Levels (AEL) initiated at the National Bureau of

Standards in 1946 called for complete coverage of the Periodic Table. Three volumes prepared

by Charlotte E. Moore and originally published as NBS Circular 467 were reprinted as NSRDS-NBS 35 in 1971. These volumes cover the elements Hydrogen through Actinium ( Z=

1-89) except for the rare earths, Cerium through Lutetium (Z=58-71). The present

compilation covering Lanthanum through Lutetium (Z=57-71) has been prepared by W. C. Martin, Romuald Zalubas, and Lucy Hagan as part of a continuing program on the evaluation

and compilation of atomic energy levels, spectral wavelengths and classifications. This work is being carried out in the Atomic Energy Levels Data Center of the Spectroscopy Section,

Optical Physics Division, Institute for Basic Standards, and in the Office of Standard

Reference Data. It represents one of the important activities of the National Standard

Reference Data System.

A similar compilation for the actinide elements is planned. The preparation of a single

volume covering both the rare-earth and the actinide elements, i.e., the originally planned

Volume IV of AEL, would have unnecessai’ily delayed publication of the present tables. The

somewhat different title of the present publication and the assignment of a separate NSRDSNBS series number are meant to recognize this change, as well as to alert readers to certain

differences in the format of the tables from that of the previous AEL compilations.

The three AEL volumes now available as NSRDS-NBS 35 were originally issued during

the period 1949-58, and the tables for many of the included spectra are now in need of

revision. A part of this need is being met by new compilations for selected spectra. Moore’s

Selected Tables of Atomic Spectra [NSRDS-NBS 3, issued in sections] include H I, D, T [Sec.

6, 1972]; C i-vi [Sec. 3, 1970]; N i-lii [Sec. 5, 1975]; N iv-VH [Sec. 4, 1971]; 0 I [Sec. 7, 1976]; Si I [Sec. 2, 1967]; and Si 1 1 — I v [Sec. 1, 1965]. A multiplet table as well as a table of

energy levels is given for each spectrum in this series. Recent compilations of energy levels carried out in the Spectroscopy Section include 4 He I [W. C. Martin, J. Phys. Chem. Ref. Data

2, 257 (1973)], the 26 spectra of Fe, Fe I-XXVI [J. Reader and J. Sugar, J. Phys. Chem. Ref.

Data 4, 353 (1975)], the 24 spectra of Cr, Cr I-XXIV [J. Sugar and C. H. Corliss, J. Phys.

Chem. Ref. Data 6, 317 (1977)], and the 25 spectra of Mn, Mn I-XXV [C. H. Corliss and J. Sugar, J. Phys. Chem. Ref. Data 6, 1253(1977)].

Many users need more extensive current data on atomic energy levels and spectra than

are included in the critical compilations now available or planned for the near future. The NBS

program thus includes publication of bibliographies covering the more recent literature in this area, with the references classified according to the types of data. The most recent such

publication is the Bibliography on Atomic Energy Levels and Spectra, July 1971 through June

1975, by Lucy Hagan [NBS Spec. Publ. 363, Suppl. 1, 1977], Earlier periods are covered in the

bibliographies NBS Spec. Publ. 363 [L. Hagan and W. C. Martin, 1972] and NBS Spec. Publ.

306, Sections 1-4 [C. E. Moore, 1968-69].

The AEL program has from the beginning received the help and cooperation of

spectroscopists in many laboratories who observe and analyze atomic spectra. I join the

authors of the present compilation in expressing sincere gratitude for this assistance.

D. R. Lide, Jr., Chief

Office of Standard Reference Data

IV
Contents

Page

Foreword iii Preface iv

1. Introduction 1 1.1. Scope and Format of the Tables 1

1.2. Important Conventions 2

a. Naming of Levels 2

b. Incomplete Terms 2

2. Coupling Schemes, Allowed Terms, Percentage Composition,

Zeeman Effect 2

2.1. Coupling Types, Order of Coupling of Electrons, Ancestral Terms 3

a. LS Coupling (Russell-Saunders Coupling) 3

b. J x j or J X J2 Coupling 3

c. jj Coupling of Equivalent Electrons 3

d. J x l or J ,L, Coupling 4

e. LS x Coupling 4

f. Coupling Schemes and Term Symbols 4

2.2. Allowed Terms or Levels for Equivalent Electrons 5

a. LS Coupling (Table 1) 5

b. jj Coupling (Table 2) 5

2.3. Percentage Compositions of Levels 5

a. Explanation of Eigenvector Percentages 5

b. Need for Leading Percentages, and a Caveat 6

2.4. Zeeman Effect (Tables 3-6) 6

3. Material Preceding Each Table —Summary Data, Comments, References 7

4. Explanation of the Tables (by Column Heading) 8

4.1. Configuration 8

a. Levels Tabulated With Leading Percentages 8

b. Levels Tabulated Without Leading Percentages 8

c. Limits : 8

4.2. Term 8

a. Levels Tabulated With Leading Percentages: Naming of Levels,

Grouping of Levels Into Terms, Other Conventions 8

b. Levels Tabulated Without Leading Percentages 9

4.3. Total Electronic Angular-Momentum Quantum Number J 10

4.4. Level 10

4.5. Experimental g Value 10

4.6. Leading Percentages 10

a. First Percentage 10

b. Second Percentage From Same Eigenvector as First

Percentage 10

c. Second Percentage Is for Leading Component of Eigenvector

in Alternate Coupling Scheme 10

5. Note on Tables of Wavelengths for Rare-Earth Spectra 11

6. State of Analyses of Rare-Earth Spectra 12

7. Acknowledgments 12

8. References 13

9. Tables for the Introduction 14 Table 1. Allowed Terms for LS Coupling of Equivalent Electrons 14 Table 2. Allowed J Values for Zjv Equivalent Electrons (jj Coupling) 17 Table 3. Corrected Lande g Values for Terms of Odd Multiplicity 18 Table 4. Corrected Lande g Values for Terms of Even Multiplicity 21 Table 5. Lande g Values for Terms of Odd Multiplicity in Order of

Increasing g 24 Table 6. Lande g Values for Terms of Even Multiplicity in Order of

Increasing g 25 Table 7. The Periodic System 26

v
Index to Tables of Energy Levels

Z Element Spectrum* Page

57 Lanthanum La I 27 La II 36 La in 41 La iv 43 La v 45

58 Cerium Ce i 47 Ce 11 70 Ce in 83 Ce iv 91 Ce v 93 Ce VI 94

59 Praseodymium Pr 1 95

Pr II 102 Pr III 108 Pr IV 119 Pr V 123

60 Neodymium Nd 1 124 Nd 11 137 Nd ill 148

f Nd iv] 149

61 Promethium Pm 1 151 Pm 11 156 (Pm hi) 160 [Pm iv] 161

62 Samarium Sm 1 162 Sm 11 174 Sm hi 180

[ Sm iv] 182 Sm XXXV 184

63 Europium Eu 1 185 Eu II 199 Eu ill 204

[ Eu iv] 208

64 Gadolinium Gd 1 209

Gd 11 225

Gd in 235

[ Gd iv ] 237

Gd XXXVII 238

65 Terbium Tb 1 239

Tb 11 250

Tb in, 255

Tb iv 259

vi
Index to Tables of Energy Levels—Continued

Z Element Spectrum* Page

66 Dysprosium Dy I 261

Dy ii 279

( Dy hi) 292

[Dyiv] 293

Dy XXXIX 295

67 Holmium Ho I 296

Ho ii 305

Ho in 308

[Ho IV] 312

68 Erbium Er i 314

Er ii 332

Er in 339

I Er iv ] 341

69 Thulium Tm I 342

Tm ii 358

Tm iii 368

[Tm iv] 372

70 Ytterbium Yb I 373

Yb ii 382

Yb in 391

Yb iv 394

71 Lutetium Lu I 398

Lu ii 404

Lu in 407

Lu iv 408

Lu v 410

'“Spectral symbols enclosed in brackets indicate data obtained from ions in crystals or solutions. No analyses are available for the spectra in parentheses.

vii

Atomic Energy Levels— The Rare-Earth Elements

The Spectra of Lanthanum, Cerium, Praseodymium, Neodymium,

Promethium, Samarium, Europium, Gadolinium, Terbium,

Dysprosium, Holmium, Erbium, Thulium, Ytterbium, and Lutetium

W. C. Martin, Romuald Zalubas, and Lucy Hagan

Institute for Basic Standards, National Bureau of Standards, Washington, D.C. 20231,

Energy level data are given for 66 atoms and atomic ions of the 15 elements lanthanum (Z=57)

through lutetium (Z=71). These data have been critically compiled from published and unpublished material. Only experimentally determined energy levels are included, the energies being restricted to excitations of

outer-shell electrons and to inner-shell excitations up to the soft x-ray range. The levels were taken from

analyses of the spectra of atomic gases wherever possible; however, the levels for several of the triply ionized rare earths are from analyses of the spectra of the ions in crystals or solutions. In addition to the

level value (usually in units of cm

1 ) and the parity, the J value, configuration and term assignments, and

the experimental g value are listed wherever available. Leading percentages from the calculated eigenvector are also tabulated for each level if available. The levels are grouped into spectroscopic terms of appropriate coupling schemes where such groups appear meaningful. Ionization potentials are tabulated for most of the spectra. Complete references for the tabulated data are given for each spectrum.

Key words: Atomic energy levels; atomic spectroscopy; electron configurations; ionization potentials; lanthanides; rare earths; spectra; Zeeman effect.

1. Introduction

A program on the compilation of atomic energy levels was

begun at the National Bureau of Standards in 1946 by

Charlotte E. Moore under the direction of William F. Meggers [Moore, 1971 ].

1 The appearance of the third volume

of Moore’s Atomic Energy Levels (AEL) in 1958 completed

the coverage of the elements through Ac (Z=89) except for

the rare earths Ce through Lu (Z=58-71). A planned

Volume IV of AEL was to include the rare earths and the

actinide elements; publication of such a volume was not

feasible during the 1960’s, however, because many of the

needed spectra had not been analyzed sufficiently, if at all. Atomic spectroscopists have greatly increased the available

data for these elements during the past 15 years or so, and

active work on the present compilation was begun in 1969. As the compilation progressed we decided to publish the

tables for the rare earths separately. A similar compilation

for the actinide elements is planned.

1.1. Scope and Format of the Tables

The compiled data pertain to the energy levels of the

atoms and ions of the 15 elements La (Z=57) through Lu

(Z=71). Although La I, La n, and La ill were included in AEL Vol. Ill, the new and revised data obtained for La I through La v since 1958 warranted new compilations. Only

experimentally determined values of the energy levels are

tabulated, and the energies are restricted to excitations of

outer-shell electrons and to inner-shell excitations up to the

1 Names and dates in brackets indicate references at the end of this introduction.

soft x-ray range. All but a relatively few of the levels have

been obtained from analyses of optical spectra. The sources

for most of these spectra were atomic gases; ideally, the

levels are evaluated for free, unperturbed atoms and ions. Reliable analyses were not available, however, for the

(free-ion) spectra of triply ionized Nd, Pm, Sm, Eu, Gd, Dy,

Ho, Er, and Tm. In each case we have therefore given a few

levels as derived from the spectra of the ions in crystals or

solutions. These levels are enclosed in brackets to indicate

that the derived positions may differ from corresponding

values for the unperturbed ions by several percent. No data

of this type are included for species other than triply

ionized.

An explanation of the data tabulated with the energy

levels is given in section 4, arranged by column headings.

The format of the AEL tables, which was based to a considerable extent on the earlier Atomic Energy States [Bacher and Goudsmit, 1932], is now probably the most

familiar scheme for the presentation of energy level data. We have retained much of this format while adapting and

extending it to give more detailed theoretical descriptions of

levels for which such information is available. The main

formal changes are the addition of the “Leading

Percentages” (referring to the theoretical composition of the

levels) and the deletion of the “Interval” column. Changes in the arrangement within some of the other columns are noted in section 4. We originally prepared a table for each spectrum with the

levels of the two parities intermixed. In a number of cases, however, the complication added by intermixing two

separately complex level structures appeared to outweigh

1
2

any advantages of the arrangement. In such cases we give

the levels in separate lists for the two parities, a practice now followed in most publications on complex spectra. (A

deviation from the usual AEL arrangement of intermixed

parities was in fact made for Hf i; see AEL Vol. Ill [Moore, 1971].)

The notations for several different coupling schemes and

a convention bearing on the order of coupling of the

electrons are used without comment in the tables. Explanations of the notations and of some other pertinent

theoretical points are given in section 2. It should be emphasized that the familiarity of the format

can be misleading unless certain new conventions are understood. We recommend the reading of section 4 of the

Introduction (especially 4.1, 4.2, and 4.6) by all who plan to use this compilation in more than a casual way. The

following points are based on the more detailed explanations

given in sections 2 and 4.

1.2. Important Conventions

a. Naming of Levels

We have retained the practice of listing the levels according to spectroscopic terms, except where such

groupings of levels would be meaningless as indications of

atomic structure. In a note on coupling in rare-earth spectra,

G. Racah wrote “... in many configurations of the rare earths

there are interactions which are of the same order of

magnitude, and it will be impossible to define the coupling

scheme. This does not mean that it will be impossible to calculate the positions of the levels and even the exact compositions of the states; this only means that the

composition will be such a complicated combination of

different states, that it will be impossible to correlate it with a meaningful name or symbol” [Racah, I960], To make

the compilation easier to use, we have tried to handle the

question of term names in a reasonably consistent manner

for all spectra. The criteria we followed in deciding whether

to retain (or in some cases to assign) names for levels are explained in section 4.2. If a level is given with leading percentages and with a term symbol under the “ Term ” heading, the full set of

symbols in the first two columns (plus the J value)

constitutes a unique name in this compilation. This also holds for levels given without leading percentages, provided

the appropriate ancestral terms are given with the

configuration. In most cases we have not given shortened

designations for the levels; this is emphasized because in the

AEL tables each term or interpreted level has a unique

short designation under the column heading “Desig.”

Levels not listed with a term symbol in the second column

( under “Term ”) have no symbolic names for the purposes

of this compilation.2. This should be noticed especially in connection with J x j and J X J2 coupling, since the symbols in the first column alone constitute complete theoretical term

A convenient method for designating unnamed levels is to give the numerical value with the J

value as a subscript, and a superscript degree symbol for odd levels. It is usually sufficient to give

the position to the nearest cm -1

, or simply truncated at the decimal point.

descriptions in these schemes— such a term is a suggested

name, however, only if it is followed by a (J x ,j) or ( 7,,72 ) term symbol in the second column.

In cases of strong configuration interaction, an attempt to correlate each eigenvector with even a particular

configuration can be meaningless. The configuration listed in the first column does not necessarily represent a

configuration assignment for the level; the configuration for

the first percentage is normally given in the “Configuration”

column regardless of the magnitude of this percentage.

b. Incomplete Terms

Predicted levels that have not been found are usually not

indicated notationally in these tables. The only exceptions

occur as levels of partially known terms (shown as term

groups), and the levels of such terms are grouped only

under certain conditions (sec. 4.2). Some conventions

regarding incomplete terms can be noticed in an example

from the 4/ 6

( 7 F)5d subconfiguration of Eu ill:

Term 7 Level

fi G %

% 49905.64

%

W2 51650.77

13/2 52099.87

The blank spaces under “Level” for J= 3

/2 and % indicate

that these levels have not been found in the analysis (a

standard convention). It will be noticed, however, that no

blank space or J value appears for a third level “missing”

from this term (7=%). This omission signifies that none of

the calculated eigenvectors is appropriate for the corresponding designation. By the omission we avoid the

implication that a 4/ 6

( 7 F)5d 6 G7/2 level is missing from the

Eu ill analysis. The best candidate levels for this designation are known and may be found among the levels near the 6 G term. (In this particular example, all of the

calculated 4/ fi (

7 F)5d 6 G7/2 composition is distributed among

known levels, since all twelve 7=% levels for the interacting

4/ 6( 7 F)5d and 4/ 6(

7 F)6s subconfigurations are known.)

2. Coupling Schemes, Allowed Terms,

Percentage Composition, Zeeman Effect

We assume that the reader is familiar with the basic

vocabulary and standard notations used in discussing atomic

structure and spectra.3 However, the notations required for

the full description of some of the theoretical states used in this compilation are necessarily more complex than for

simpler spectra, and an explanation of certain adopted

conventions is needed. The following outline of the

notational scheme (sec. 2.1 and 2.2) includes all the coupling

A pertinent summary is given in the introduction to Vol. I of AEL IMoore, 1971). El’yashevich

(1961] gives an extensive discussion and a number of useful tables relating to the theoretical properties of terms and levels of rare-earth configurations. In the case of words used differently by

different authors (e.g., term, m ultiplet), we follow Condon and Shortley (1963, chaps. 7-9J.
3

types that now appear to be needed for Atomic Energy

Levels compilations.4 This section is also in part an

introductory supplement to section 4, which gives a detailed

explanation of the tables.

2.1. Coupling Types, Order of Coupling of

Electrons, Ancestral Terms

In this section we give enough examples to make clear the

meaning of the different coupling-scheme notations. Not all of the configurations in the examples have been identified

experimentally, and some of the examples of a particular

coupling scheme (given for heuristic purposes) may be

physically inappropriate.

a. LS Coupling (Russell-Saunders Coupling)

Some examples of this familiar scheme are given below

mainly to indicate a spacing convention bearing on the order

of coupling of the electrons.

Configuration Term

1. 4/ 7

( 8 S°)6s6p( 3 P°) 10 P

2. 4f 7

( 8 S°)6s6p2

(

4 P) n P°

3. 4/ 7

( 8 S°)5d 2

( 3 F) 10 F°

4. 4/ 10

(

3 K2)6s6p('P°) 3 L°

5. 4/ 7

( 8 S°)5rf (

7 D°)6p 8 F

6. 4/ 7

(

8 S°)5d ( 9 D°)6s (

8 D°)7s 9 D°

7. 4/ 7

( 8 S°)5d ( 9 D°)6s6p( 3 P°) 11 F

8. 4/ 7

( 8 S°)5d2 ('G) ( 8 G°)6p 7 F

9. 4/( 2 F°) 5d2 ('G)6s ( 2 G) 'P0

In the first example, the seven 4/ electrons couple to give an

8 S° term, and the 6s and 6p electrons couple to form the

3 P° term; the final 10 P term is one of three possible terms

obtained by coupling the 8 S° and 3 P° parent terms. The next

three examples are quite similar to the first. The meaning of

the index number 2 following the 3 K symbol in the fourth

example is explained in section 2.2. The coupling in example five is appropriate if the

interaction of the 5d and 4/ electrons is sufficiently stronger

than the 5d-6p interaction. The 7 D° parent term results

from coupling the 5d electron to the 8 S° grandparent, and

the 6p electron is then coupled to the 7 D° parent to form the

final 8 F term. A space is inserted between the 5d electron

and the 7 D° parent to emphasize that the latter is formed by

coupling to a term ( 8 S°) listed to the left of the space. The

sixth example illustrates a similar coupling order carried to

a further stage; the 8 D° parent term results from the

coupling of the 6s electron to the 9 D° grandparent.

The seventh example is similar to the first four cases, but

in seven the first of the two terms that couple to form the

4 Neither the jj coupling scheme for equivalent electrons (2.1.c, 2.2.b) nor the LS\ coupling scheme

(2.1.e) is used in this volume.

final 11 F term, i.e., the 9 D° term, is itself formed by the

coupling of the 5d electron to the 8 S° core term. The eighth

example shows an 8 G° parent term formed by coupling the

8 S° and 4 G grandparent terms. A space is again used to emphasize that the following ( 8 G°) term is formed by the

coupling of terms listed before the space. A different order of coupling is indicated in the final example, the 5d

2 *G term being coupled first to the external

6s electron instead of directly to the 4/ core electron. The

4/(

2 F°) core term is isolated by a space to denote that it is coupled (to the 5d2

(

1 G)6s 2 G term) only after the other

electrons have been coupled. The notation in this particular case (with a single 4/ electron) could be simplified by

writing the 4/ electron after the 2 G term to which it is coupled. It appears more important, however, to retain the

convention of giving the core portion of the configuration

first. The notations in examples 1-4 are in the form

recommended by Russell, Shenstone, and Turner [1929], and

used in both the Atomic Energy States and AEL

compilations. The convention introduced in the remaining

examples allows different orders of coupling of the electrons

to be indicated without the use of additional parentheses,

brackets, etc.

b. JJ or JJ2 Coupling

The symbol /.refers to the total angular momentum of an

electron or of a group of electrons; a small j indicates

explicitly the angular momentum of one electron (j=l± 1h). In the configuration notations, J, values are written as

subscripts.

Configuration Term

1 . 4/( 2 F j/2 )6p.!/2 ( 5/2,%)

2. 4/2

( 3 H5 )6p1/2 (5,V2 )°

3. 4/ 11 (

2 H°9/2 2)6s6p( 3 P°) (%,1)

4. 4/ 9

( 6 H°)5d (

7 H°)6s6p( 3 P°) (8,0)

5. 4/ 12

( 3 H6 ) 5d( 2 D)6s6p( 3 P°) ( 4 F°/2 ) (6,%)°

6. 5/ 4

( 5 I 4 )6d3/2 (4,% ) 11/2 7s7p( 1 P°) (

1JM)°

These examples all have an /-electron core in LS coupling.

The (J X J) and (J U J2 ) term symbols are used throughout

this compilation. The configuration notation 4/5/2 6p3/2 might

well be used in the first example, but the notation shown

emphasizes that the 4/ electron belongs more to the atomic

core. This notation is also preferred because of its similarity

to the more complex examples that follow.

c. jj Coupling of Equivalent Electrons

This scheme has been used for calculations of some 5f

N

actinide configurations, and is often used in relativistic ab

initio calculations. Notations of the following types are

consistent with those outlined above.
4

Configuration Term

1 . 6d 5/2 6dS/2 (%,%)

2. 6ds/2

3. 5/ 7/2 5/ i/2 (*4,4)

4. 5/ 7/2 5/5/2 (8,% )°2m 7p3/2 ( 21

/2 ,%)

5. 5/?/2 5/!/2 (%,%)s 7s7p( 3 P?2 ) (9,2)°

The configuration in the second example shows a general

notation for equivalent electrons having the same j value.

The third example shows a more general case of jj

coupling of equivalent electrons, with each of the two

groups of electrons (jx =

’7k, j2 = 5

/2 in this case) having more

than one allowed J value. The allowed J values for If equivalent-electron groups are given in table 2 through j=V2 . The l* l2 group has two levels for each of the J values 2 and

4; these are distinguished by seniority numbers given as preceding subscripts to the /, values. The (J X ,J2 ) notation

under “Term” follows the convention that Jx arises from the

group of electrons on the left, J2 from the group on the

right. In pure jj coupling, the levels of an entire

subconfiguration such as 5/7/2 5/ 2

/2 are degenerate; thus the seven subconfigurations of 5/ 6

, for example, are the real “terms” in this scheme. The listing of the (J X ,J2 ) symbols

under the “Term” heading is, however, a notational

convenience implied by the fact that the final ( J x ,J2 )j wavefunctions constitute the basis set in the jj scheme (see

2.2.b). The fourth and fifth examples are obvious extensions to configurations having external electrons, with a resultant J2 coupled to the core J x to form a (J x , J2 ) term.

d. J x l or J x L2 Coupling5

Configuration Term

1 . 4/( 2 F°5/2 )5<7

2

[ 9

/2

]°

2. 4/2

( 3 H4 )5<7

2 [3]

3. 4/ 13

(

2 F°7/2 )5d 2 ('D) '[ 7

/2 ]°

4. 4/ 13

( 2 F°/2 )5d6s( 3 D) 3

[ 9

/2 ]°

The first two terms result from coupling a parent-level J x to the orbital angular momentum of a 5g electron ((=4) to obtain a resultant K value enclosed in brackets. The spin of

the external electron is then coupled with the K angular

momentum to obtain a pair of J values, J=K± 1

/

2

(for 0), not shown. The multiplicity (2) of such pair terms has

usually been omitted from the term symbol; it is given

explicitly in these tables, since other multiplicities occur in the more general J X L2 coupling (examples 3 and 4). The last two examples are straightforward extensions of J x l coupling, with the L2 and S 2 momenta of the “external” term

(‘D and 3 D in examples 4 and 5, respectively) replacing the l and s momenta of a single external electron.

Some authors refer to this scheme as JK coupling.

e. LS X Coupling*

Configuration Term

5pR

( 2 P°)5/ G

2 [%]

5p3( 4 D°)5/ 2

( 3 F) H° 3

[ 13/2 ]°

In these hypothetical examples from the Xe 1 and I I isoelectronic sequences, the 5/ electrons are mainly “outside”

the 5 p

N cores. The orbital angular momentum of the core is coupled with the orbital angular momentum of the external

electron(s) to give the total orbital angular momentum L. The letter symbol for the final L value is listed with the

configuration because this angular momentum is then

coupled with the spin of the core (S x ) to obtain the resultant

K angular momentum of the final term (in brackets). The

multiplicity of the [ K] term arises from the spin of the

external electron(s).

f. Coupling Schemes and Term Symbols

The coupling schemes outlined above include those now

most frequently used in calculations of atomic structure. Since the notations clearly distinguish the different schemes,

it will not be necessary in our discussions of particular

spectra to indicate the coupling schemes for the various

configurations.

Each of the three types of term symbols gives the values

of the two angular momenta that couple to give the total electronic angular momenta of the levels (indicated by the J

values). For configurations of more than one unfilled

subshell, the angular momenta involved in the final coupling

derive from two groups of electrons (either group may

consist of only one electron). These are often an inner group

of coupled electrons and an outer group of coupled electrons,

respectively. In any case the quantum numbers for the two

groups have been distinguished by subscripts 1 and 2, so that quantum numbers represented by capital letters without subscripts are total quantum numbers for both

groups. Thus the quantum numbers for the two vectors that

couple to give the final J are related to the term symbol as

follows:

Coupling

Scheme

Quantum numbers for vectors that couple

to give J

Term Symbol

LS L,S 2S+1 L

J1J2 Jwh

JiLiir+K) K, S2 252+1 [K]

LSA-+K) K, S2 252+1 [K]

The parity is parity terms.

indicated by appended degree symbols on odd

6 A1so referred to as LS C ( c for core) or LK coupling.
5

2.2. Allowed Terms or Levels for

Equivalent Electrons

a. LS Coupling (Table 1) Configurations with one or more groups of equivalent

electrons are usually analyzed or calculated on the basis of

LS coupling of the equivalent electrons. The allowed terms

of a configuration consisting of two inequivalent groups are obtained by coupling the L and S vectors of the groups in all possible ways, and the procedure may be extended to any

number of such groups. Thus the allowed terms for any

configuration can be obtained from a table of the allowed

terms for groups of equivalent electrons. Table 1 is sufficient for this purpose for any configuration in this compilation.

The configuration l N has more than one allowed term of

certain LS types if (>1 and 2<N<Al (c£.3 -d7 and /

3 -/ u

in table 1). Each recurring term of a particular type for one of

these configurations in table 1 is immediately followed by a sequential index number [Nielson and Koster, 1963]; these

index numbers stand for additional theoretical quantum

numbers that differentiate the recurring terms except for a few terms of /

5 and /

9

, /

6 and /

8

, and /

7

. The first of the additional quantum numbers given with

each term of the d

N and fN configurations is the seniority

number [Racah, 1942; 1943; 1949], The seniority number of

each d

N term is followed by the group label of the term

according to the irreducible representations of the Rb group.

This label consists of two integers ( w x w2 ) in parentheses,

with 2^w l ^w2 '^0. The theoretical classification of the terms of the f

N configurations is according to the scheme of Racah [1949],

The seniority number (not needed, but given for

completeness) is followed by the group labels W (three

integers (w x w2 w% ), with 2s=w x ^w2 ^w2 ^0) and U (two

integers (u x u2 ), with A^u x +u2 and u x ^u2 ^0). These identify

respectively an irreducible representation of the R 7 group

and an irreducible representation of its subgroup G2

. The

few remaining duplicated terms are further labeled A or B

to indicate Racah’s separation of the two terms.

In the tables of energy levels, we use the index numbers

assigned by Nielson and Koster to distinguish recurring

terms. For the d

N configurations, this procedure has the

disadvantage of substituting an arbitrary number for a quantum number (the seniority) that itself distinguishes the

recurring terms in all cases. The actual value of the

seniority number is rarely needed, however, and we prefer a consistent notation for the d

N and f

N configurations.

b. jj Coupling (Table 2) The allowed J values for a group of N equivalent

electrons having the same j value, If are given in table 2 for

j=y2 , %, %, and % (sufficient for (=£3). The lf2 group has

two allowed levels for each of the J values 2 and 4. The

subscripts distinguishing the two levels in each case are the

seniority numbers [de-Shalit and Talmi, 1963].

The allowed levels of the configuration nl p may be

obtained by dividing the electrons into sets of two groups

nl <j

l+l/2 nl p

_ 1 /2 , Q+R-P. The possible sets run from Q=P-2l (or zero if P<21) up to Q=P or Q-21+2, whichever is smaller.

The (degenerate) levels for a set with both Q and R

nonzero have wavefunctions defined by the quantum

numbers (aJ l ,f3J.z ) J , with the J, the resultant angular

momentum of the Q group, and J2 from the R group. The

symbols a and (3 represent any additional quantum numbers

required to identify levels of the Q and R groups,

respectively. The J values of the allowed levels for each

(aJj, (3J 2 ) subset are obtained by combining Jx and J2 in the

usual way.

2.3. Percentage Compositions of Levels

a. Explanation of Eigenvector Percentages

The analyses of many rare-earth spectra could be carried out beyond a very limited stage only with the aid of

calculations of the energy level structures. The calculations

of interest here yield the wavefunctions of the levels expressed as eigenvectors of a certain type: the eigenvector

for each level is a linear combination of single-configuration

single-term wavefunctions. (The configuration and quantum

numbers designating a level of a theoretical spectroscopic

term determine the angular dependence of a corresponding

wavefunction.) Thus the wavefunction | aJM) of the M

sublevel (state) of a level labeled aJ is expressed in terms

of basis states; for example, if basis states | ySLJM) are formed by Russell-Saunders coupling,

| aJM) = £ \ySLJM) (ySLJ\aJ).

ySL

The symbol y represents all the quantum numbers needed in addition to SLJM to specify a basis state | ySLJM)

(configuration, parentage, group-theoretical label, etc.). The

( ySLJ\aJ

)

are expansion coefficients, and

X \(ySLJ\aJ)\ 2 = 1. ySL

The squared expansion coefficients for the various ySL

terms in the composition of the aJ level are conveniently

expressed as percentages, whose sum is 100%. Thus the

percentage contributed by the pure Russell-Saunders state ya S h Lc J is equal to l00-\(yn S h Lc J\aJ)\ 2

. The notation for

Russell-Saunders basis states has been used only for concreteness; the eigenvectors may be expressed in any

coupling scheme, and the coupling schemes may be different

for different configurations included in a single calculation

(with configuration interaction).

Notations of the type (A+R+...), where A, B, ... represent

configurations, will be used in referring to calculations that

include the interactions of the configurations listed between

the parentheses.

The largest percentage in the composition of a level is called the “purity” of the level in that coupling scheme. The

coupling scheme (or combination of coupling schemes if more than one configuration is involved) that results in the
6

largest average purity for all the levels in a calculation is usually best for naming the levels. Calculations of very

complex configurations are almost always carried out with

Russell-Saunders basis states, however, and eigenvectors in this scheme are usually advantageous for most purposes.

Transformations to other schemes of higher purity are often

made as the last step of a calculation.

b. Need for Leading Percentages, and a Caveat

In the tables we give one or two leading percentages from

the eigenvectors of the levels where these are available (see

sec. 4). The percentages are important qualifiers of the

configuration and term notations given with the levels. The

need for some indication of low eigenvector purities seems

evident. Even leading components too small to describe a

level nevertheless serve to indicate the extent of term

and/or configuration mixing in the eigenvectors. Percentages

representing higher purities are quantitative confirmations

of the term designations (but see below).

It should be emphasized that the eigenvectors are

calculated quantities, dependent on particular theoretical

models and subject to the inaccuracies of necessary

approximations. Even within a particular approach such as, for example, the parametric treatment of Slater-Condon

interactions, the results are affected by the inclusion or omission of explicit configuration interaction (and which

configurations are included), effective interactions, explicitly

term-dependent interactions, magnetic interactions in addition to the spin-orbit interaction, etc. The variation of

the eigenvectors due to such effects can in some cases change the designations of particular levels. The calculations

also vary considerably in the overall accuracy of the

resulting eigenvectors, and thus in the accuracy of

prediction of the observed quantities—energy levels, g

values, line strengths, etc. The reader is urged to consult the

references given with the individual, tables for details about

calculations of interest.

2.4. Zeeman Effect (Tables 3-6)

The Zeeman effect for “weak” magnetic fields is of

interest here because of the importance of Zeeman data in the analysis of complex spectra. In the weak-field effect, the

J value of a level remains a good quantum number, although

in general the level is split by the field into magnetic

sublevels. (The field is weak only in the sense that the

splittings must be small compared to the level separations.

The nuclear magnetic moment is here assumed to be zero, or

to have a negligible effect.) For our purpose, the g value of

such a level may be defined by the expression for the

energy shift of its magnetic sublevel having magnetic

quantum number M (which has one of the 2/+1 values, -J, ~ J+ 1, ..., J— 1, J)'.

AE = gM/xn £>.

The magnetic flux density is B and yu.,, is the Bohr magneton

(ju, 0 =d/Zm, in SI units). Since the g value is a gyromagnetic

ratio (expressed as a pure number), the concept is

meaningless for J=0; levels having this J value are excluded

from the discussion.

The wavenumber shift Act corresponding to the energy

shift gMg. n B is given by

Ao- = c/M(0.466S6B cm’/T).

Here the magnetic flux density B is expressed in units of

the tesla (symbol T, equivalent to 104 gauss). The quantity in parentheses, the Lorentz unit, is of the order of 1 cm' 1 for

typical flux densities used to obtain the optical Zeeman

effect. Most of the g values tabulated here were derived by

application of this formula (for each of the two combining

levels) to measurements of optical Zeeman patterns. A

single transverse-Zeeman-effect pattern (two polarizations,

resolved components, and sufficiently complete) can yield

the J value and the g value for each of the two levels involved [White, 1934; van den Bosch, 1957],

The highly accurate g values tabulated for some low levels

in neutral atoms have been obtained by atomic beam

magnetic-resonance techniques; the analysis of this type of

data usually involves nuclear moments, and in general is more complex than the weak-field optical effect [Marrus and

Nierenberg, 1962; Wybourne, 1965, chap. 5]. The g value of a level aJ belonging to a pure LS-coupling

term is given by the formula:

i i / i \ J(J+l)~L(L+l)+S(S+l )

.

S.su = 1 + (9.-1) 2JUTT)

The independence of this expression from any other

quantum numbers (represented by a) such as the

configuration, etc., is important. The expression is derived

from vector coupling formulas by assuming a g value of

unity for a pure orbital angular momentum (singlet level)

and writing the g value for a pure electron spin (S level) as

9s [Wybourne, 1965, p. 98], A value of 2 for g, yields the

Lande formula. If the anomalous magnetic moment of the

electron is taken into account, the value of g„ is 2.002319.

“Corrected” Lande g values 7 obtained with this value for gs are given according to Russell-Saunders terms in tables 3

and 4. Tables 5 and 6 give Lande g values in increasing

order, the (three-place) values being from the uncorrected

Lande formula.

The usefulness of Lande g values is enhanced by their

relation to the g values in intermediate coupling. In the

notation used in section 2.3 for the description of a level aJ

in intermediate coupling, the corresponding g value is given

by:

9aj = J,9slj \(ySLJ\aJ)\ 2

,

ySL

where the summation is over the same set of quantum

numbers as for the wavefunction. The g aJ value is thus a weighted average of the Lande gSLJ values, the weighting

factors being just the corresponding component percentages

7 The g values in tables 3 and 4 are from an unpublished tabulation by Dr. Mark Fred of the Argonne

National Laboratory. The arrangement here follows similar tables in Vol. I of AEL IMoore, 1971J.
7

from the eigenvector of the aJ level in the LS-coupling

representation.. The range of g values of interest can be

obtained from the Lande formula; the practical range (table

6) is from -2.000 to 4.667. The Lande formula in general requires additional

corrections if theoretical values accurate to three or more

decimal places are needed. Relativistic and diamagnetic

corrections have been calculated for the g values of a number of low levels of neutral rare-earth atoms [Judd and

Lindgren, 1961; Conway and Wybourne, 1963]. If the

correction for intermediate coupling is excepted, the

absolute value of the sum of the corrections to the Lande

formula appears to be less than 0.002 for most of the g

values calculated by Judd and Lindgren.

The formulas for g values in two other coupling schemes

used in this compilation are:

J,J2 coupling

\(J j+1)—J2 (J2 +1)

9j ~ 9j ' 27(7+1)

J(J+1)+J2 (J2 + I) -J i (J i + 1

)

+9j2

2 J(J+l)

J X L2 coupling

Qj = 2(0, ,-D

K(K+1)+J j (J j + 1)— L2 {L/ 2 + 1) (2 J+l)(2K+l)

3J(«/+ 1) — A(A+1)+S2 (S 2 +1)

27(7+1)

provided if these are not readily apparent from the table

itself. We have given the sources of the data for each spectrum,

along with any necessary explanation of the theoretical

interpretation. We have also tried to include in the

references enough of the earlier papers to indicate the main

line of progress on the energy-level analysis of the

spectrum. References on energy levels of ions in crystals or

solutions are mainly restricted to sources of the compiled

data in cases where no free-ion data were available.

The extent of the observations of the spectra on which

the analyses are based is usually indicated (wavelength

ranges, approximate numbers of lines). The main references

for line lists are given, except that we usually do not cite any of the extensive collections of atomic wavelengths that

may be useful for a particular spectrum. References for

several such collected tables are listed in section 5. The

references for various other types of data not included in the tables (hyperfine structure, isotope shifts, etc.) are very

incomplete, and in many cases are omitted entirely.

The abbreviations of periodical titles generally follow the

Bibliographic Guide for Editors and Authors [1974], The

symbols following the citations indicate types of data or other content according to the following code:

EL Energy Levels

Experimental energy differences, except Hfs or IS. Includes references that suggest the rejection of

previously reported levels or confirm previously

doubtful levels.

The J 1 L2 -coupling formula is from Wybourne [1965, p. 100]

with gr

s set equal to 2. If S2 =V2 , so that J=K±Vi, the second

term simplifies to (2 J+1)/(2K+1), and the formula is equivalent to that given by Racah [1942a] for J f coupling.

ND New Designations

New or changed designations or J values for known

energy levels. This symbol is sometimes omitted,

especially if the symbol EL occurs.

3. Material Preceding Each Table — Summary

Data, Comments, References

Some basic data are collected at the beginning of the table

for each spectrum.* The configuration and term designation

of the ground-state level are given, with the electrons of

inactive closed subshells listed in parentheses. The

wavenumber corresponding to the principal ionization

energy is given, as well as this energy expressed in electron-volts (eV). An equivalence of 1 eV to 8065.479+0.021 cm 1 was used for the conversion [Cohen and

Taylor, 1973]. The confidence levels of the quoted

uncertainties for many of the ionization energies were not given in the original papers. Uncertainties quoted without

comment are probably best taken as standard-deviation

errors. A summary list of the configurations to which

experimental levels of each parity have been assigned is

A single-page tabulation of the ground levels and ionization potentials for the neutral through triply ionized lanthanide atoms is given in a compilation of such data for the lanthanides and actinides IMartin, Hagan, Reader, and Sugar, 1974]. A number of the ionization potentials are superseded by more accurate values in the present compilation.

CL Classified Lines

Indicates the assignment of observed lines to transitions between energy levels that are specified

by theoretical designations and/or by their positions

in a known level scheme.

W Wavelengths (or wavenumbers)

New measurements, or wavelengths newly assigned

to a particular spectrum. Also, measurements of

other entities corresponding to energy differences

between levels. ZE Zeeman Effect data or interpretation

SE Stark Effect data or interpretation

Hfs Hyperfine structure Observations and theory.

IS Isotopic or Isomeric (Nuclear) Shifts

Observations and theory.

IP Ionization Potential (Ionization Energy)
8

SF Series Formulae

Evaluated series constants, including those

appearing in polarization-theory formulae.

PT Parametric Theory

Calculations in which the energy parameters of

Slater-Condon theory, or extensions thereof, were

obtained by fitting the theory to experimental levels,

g values, and/or other observed quantities.

AT A b initio Theory

These references are mostly to Hartree-Fock type

calculations of energy parameters or levels.

Additional references for these types of data may be

found in the NBS bibliographies [Moore, 1969; Hagan and

Martin, 1972; Hagan, 1977]. A recent article on rare-earth

atoms and ions by Blaise, Camus, and Wyart [1976] includes some types of data omitted from the present compilation,

especially hyperfine structures and isotope shifts. The date of submission of the manuscript for each

spectrum is given in brackets following the list of

references.

4. Explanation of the Tables

(By Column Heading)

For most of the headings, it is convenient to discuss

separately the cases of levels tabulated with and without

leading percentages.

4.1.

Configuration

a. Levels Tabulated With Leading Percentages

The electron configuration for the largest component in the calculated eigenvector for the level is normally given in this column. (The configuration is for the largest component

to within the estimated uncertainty of the calculation; see

4.2.) Any ancestor terms or J values appropriate to this component are normally included with the configuration, as

in the examples in section 2.1. A question mark after the configuration indicates that the

assignment of the observed level to the calculated

eigenvector is uncertain. This particular notation for an

uncertain assignment usually implies that at least one other

possible assignment of the level would give a different

configuration or set of parent terms for the leading

component.

The configuration is listed only once for a set of levels grouped into a term (see 4.2). All notations given with the

configuration, including any question marks, apply to each

level of such a term.

In cases of strong configuration interaction, more than

half the percentage composition of a level may be due to components from a configuration different from that for the

leading component; such an example makes it clear that the

configuration given in the first column does not necessarily

represent a configuration assignment of the level. A

particular configuration may appear in the first column for more levels than the pure configuration is allowed (see

Ce ill for a relatively simple example).

b. Levels Tabulated Without Leading Percentages

The reliability and indeed the meaning of configuration

assignments made without, supporting calculations vary

greatly. Even in the most complex spectra, there may be some levels or groups of levels belonging largely to a single

configuration. The observed structure, g values, intensities,

and other data can in such cases lead to unambiguous

assignments representing high purity. (Examples are the

lower levels of most 4/ w 6s 2

, 4/

v 6s, and 4f

N configurations in the rare earths.) Quite often, however, the levels to be

interpreted comprise a dense structure to which several

configurations are known or expected to contribute. Some

preliminary configuration assignments may be possible and

useful in such cases, but such assignments for the bulk of

the levels are often best regarded as tentative until confirmed by calculations. In many cases, meaningful singleconfiguration assignments do not exist. We have tried to indicate doubtful features of the

interpretations in the discussions of particular spectra and,

to some extent, in the tables. A question mark following the

configuration indicates explicitly that the assignment is doubtful. A doubtful ancestor term is indicated by a question mark after the term symbol within parentheses.

In some cases the configuration for a level may be known,

although the appropriate ancestor terms (or even the

preferred order of coupling of the electrons) cannot be

determined without calculations. Such a configuration

assignment (together with the final term and J value)

without full ancestry does not in general serve as a unique name for the level.

c. Limits

The wavenumber corresponding to the principal ionization

energy is entered in proper sequence under “Level.” The

corresponding entry in the first column is the symbol for

the next higher spectrum of the element, followed by the

term designation and J value for the ground level of this next ion. The configuration is normally omitted, and the

word “Limit” appears in the “Term” column (the levels of

the higher ion being limits for series in the lower spectrum).

If the known levels of the lower ion (or atom) extend above

the principal limit, one or more of the higher limits are also given at appropriate positions.

4.2.

Term

a. Levels Tabulated With Leading Percentages:

Naming of Levels, Grouping of Levels Into Terms,

Other Conventions

A term symbol in the second column belongs to the

eigenvector component whose configuration and ancestry

appear in the first column. The assignment of a set of levels
9

to a term is indicated by grouping the levels and by listing

the configuration and term symbol for only the first (lowest)

level of the group.

9 The presence of both a configuration

with all necessary ancestor terms in the first column and a term symbol in the second column guarantees that each of

the levels grouped with the term is uniquely designated by

the symbols in the first two columns, together with the J

value; i.e., such levels have names. This naming convention

also applies to isolated levels not grouped into terms. The

use of the ( J U J2 ) term symbols in this connection should be

noticed; a J X J2 configuration notation in the first column is indicated as a name for the associated level(s) only if a

(J,, J2 ) symbol appears in the second column.

We usually retained or formed a term (by grouping levels)

if half or more of the candidate levels for the term were known and had leading components approximately 45% or

larger. The 45% requirement was sometimes lowered

significantly for levels having leading components

sufficiently larger than the corresponding second

components. Additional levels of lower purity (—30% to 45%) were retained (or assigned) to help complete a multilevel term provided certain conditions were met. Thus

the component for an assigned term name is normally the

leading component in the eigenvector, and is also as large a percentage of the particular name as occurs in the

eigenvector of any other level (known or not) with the same

J value. We have also tried to avoid a name for which the

configuration contributes less to the total composition of the

level than some other configuration. These are minimal

requirements for avoiding completely inappropriate names. One can assure more generally satisfactory names by

disallowing any name representing significantly less than

50% eigenvector purity; and in the case of a leading

percentage near 50%, by requiring that the second

percentage be significantly smaller (alternate designation

clearly less appropriate), and that no other eigenvector

should have a comparable leading percentage (—50%) for the same designation. The weaker criteria for the grouping and

naming of levels outlined above were adopted to allow

practically any significant term structure within a single

configuration to be exhibited in the tables. In cases of

strong configuration interaction it sometimes happens that

assignment to a particular term type remains appropriate

for a level or level group for which no meaningful

configuration assignment is possible. Such term names are

not indicated by our scheme but may usually be deduced by

examination of the two leading eigenvector percentages (see

sec. 4.6). Most of the calculated leading percentages for levels in question as to naming are probably uncertain by several

percent. In order to facilitate term assignments, we have

allowed a relatively few small deviations (by up to —4%)

from the above requirements on naming. These deviations

are probably within the uncertainties of the calculations.

9 A group of levels (or a single level) constituting a term is always set off from neighboring terms or

levels by full vertical spaces. For compactness, neighboring levels not belonging to terms are in many cases separated by less than full vertical spaces. Groups of such levels are not to be confused

with the significantly more compact groups constituting terms.

Many of the resulting terms are incomplete, in the sense

that no observed level is listed for one or more of the

possible J values of the term. A level “missing” from such a term may not have been found in the analysis; alternatively,

it may be that no theoretical eigenvector is appropriate for

the corresponding designation, even under the relaxed

criteria described above. The first case is distinguished in the tables by printing the J value of the level, and leaving a blank space in the “Level” column. The leading percentages

for such a missing level are given if available. In the second

case, the best candidate levels for the missing designation

are usually known and lie in the same region as the levels assigned to the term. Levels belonging to a term most of whose levels have not been found may nevertheless be grouped if the term

appears to be an important one or lies in a region where

most terms are more complete. The printed J values of the

missing levels explicitly indicate possible extensions of the

analysis. No predicted term is shown, however, unless at

least one level is known, and we emphasize that missing

predicted levels are generally not indicated in these tables: No term symbols or J values are listed for missing levels having low eigenvector purities or belonging to terms the

levels of which are not grouped (for whatever reason). The

reader is urged to consult the references to published

calculations for additional predicted levels. A level with the leading percentage >45% from a singlelevel term (singlet, S term, etc.) is usually so named (shown

as a term) if the second percentage is significantly smaller,

and if the other conditions outlined above are met. Isolated

levels (those remaining after the formation of all terms) are named according to similar conditions.

Some levels of f

N and dN configurations have large

eigenvector components from two or more terms of the same LS type (sec. 2.2.a). Since the resultant lowering of the

purities has no physical significance, we have retained the names of such levels having adequate total purity of a

particular LS type and labeled them with the NielsonKoster index number for the term of the leading component.

(Of course the corresponding group-theoretical numbers

have little meaning for such a low-purity term.) Similar

considerations have been applied in designating parent (or

grandparent) terms arising from f

N configurations.

A question mark after a term designation indicates that

the assignment of the observed level(s) to the calculated

eigenvector(s) is uncertain.

b. Levels Tabulated Without Leading Percentages

Most of the discussion in section 4.1.b of configuration

assignments of levels with no calculated eigenvectors is pertinent to term assignments. Some of the additional

difficulties often encountered in attempts to assign term names will be obvious from the preceding discussion.

We note here also that a term symbol in the second

column does not guarantee that the symbols in the first two

columns (and the J value) uniquely name the level; the

necessary nominal parentages may not be given.

225-298 0 - 78 -2
10

4.6. Leading Percentages

4.3. Total Electronic Angular-Momentum

Quantum Number J

An uncertain J value for a level is usually known to within two or three possible values; in such cases all the

possible J values are listed. Two or more J values may also be listed at a single energy position to denote the

unresolved levels of a term, etc. Three or more such J

values are indicated by listing the two extreme values

separated by a dash.

4.4.

Level

The levels are normally given in units of cm -1

, with

respect to the ground level at zero cm -1. Odd-parity levels are printed in italics. The uncertainty of the level positions

in units of the last decimal place is not constant; it may vary

by an order of magnitude even within an analysis. If no statement about the accuracy is made, it is usually safe to assume that the probable error is between 2 and —20 units

in the last place. A better estimate of the error in a

particular case may sometimes be obtained by consulting the

original paper(s) or line list. Levels within terms are listed in order of position. Terms

are listed in order of lowest (known) levels, with ungrouped

levels being treated as terms. The J value and blank space

indicating a missing level of a term are given in the order of

the corresponding calculated level if such a value is available.

A question mark following a level always indicates that

the level may not be real. An asterisk (*) following a level has the same meaning as

a question mark following the assignment—the term

assignment of the level is questionable. For configurations

that have been calculated, this means that the correlation of

the calculated eigenvector to the experimental level is questionable. The asterisk notation is used mainly for

questionably assigned levels included in terms. An uncertain

assignment of an isolated level may be indicated by an

asterisk, but only if the configuration in the first column

would be unchanged by any possible reassignment of the

level (no question mark in the first column).

4.5.

Experimental g Value

These (dimensionless) magnetic splitting factors are

usually obtained from measurements of weak-field Zeeman

patterns (sec. 2.4). The relation between the uncertainty and

the number of decimal places given differs according to the

observer and the particular value; the range covered by this relation is similar to that for the level values (see above).

More specific comments are made on the g values for some

spectra.

A colon following a g value indicates that it may be

significantly less accurate than values given to the same number of decimal places but not so marked. Values

followed by a question mark are tentative, usually being

based on assumptions made to allow reduction of the

Zeeman patterns.

This column normally gives one or two percentages from

the calculated eigenvector of the level. The space for the

second percentage (on the right) is used in either of two

ways, as explained below. All percentages are rounded off to the nearest percent, and the “%” symbol is omitted.

Any use of this column in a manner not outlined below is explained in the tables for particular spectra.

a. First Percentage

If the level has an assigned name (see sec. 4.2), the first percentage is for this “name” component. A first percentage

followed by a term symbol represents the largest component

in the eigenvector of a level having no assigned name, the

configuration and ancestry for this component being shown

under “Configuration.”

b. Second Percentage From Same Eigenvector

as First Percentage

If two percentages are listed without the word “or” between them, the second percentage is the largest of the

remaining percentages from the same eigenvector as the

first percentage. If the second component belongs to the same configuration as the first, usually only the parent

terms (or parent levels where appropriate) and final term

for the second component are given after the percentage.

Electron subshells common to different configurations for

the first and second percentages may be omitted from the

second configuration, the most frequent example being a common 4f

N

core. Term notations common to all second

percentages listed for the levels of a term are usually given

only once. The coupling scheme for a second eigenvector component

belonging to a different configuration may be different from

the scheme for the first component; this should not be

confused with case c below, where the second listed percentage is the leading percentage in a different coupling

scheme.

Since many authors list only the largest percentage for at

least some levels, the absence of a second percentage in this compilation does not necessarily mean that it is less than the

smallest percentage used here (0.5%, given as 1%).

The relative signs of the two eigenvector components are

not given. These are often not given in the original

publications. Furthermore, these signs depend on certain

conventions, no one set of which has been accepted by all authors. The original articles can be consulted for (possibly) more complete eigenvectors with signs.

c. Second Percentage Is for Leading Component of

Eigenvector in Alternate Coupling Scheme

Where the eigenvectors from a calculation are available in more than one coupling scheme, we often give in the second

percentage space the leading percentage from the

eigenvector calculated in an alternate scheme. This use of

the second percentage space is indicated by the word “or” between the two percentages, since each is a leading
11

percentage. Competitively high coupling purities for a configuration in different coupling schemes were, of course, regarded as an argument for giving leading percentages in alternate schemes, as was the case in which a second scheme

for the configuration in question is the preferred scheme for

a related configuration (two configurations connected by a strong transition array, etc.). We have favored LS coupling

as a second scheme in cases where another scheme was used

for naming the levels.

It should be noted that the leading component in a secon^. scheme is not necessarily a name for the level in that

scheme; in cases of low purity, the eigenvectors of two (or

more) levels of the same J value may have the same leading

component.

For some configurations, the alternate coupling schemes

are both LS coupling, but with the electrons coupled

differently in the two cases (see Eu I 4/ 7 5d6s, for example).

In this case it is usually possible to set up terms in either

scheme, as indicated by printing the term symbol for the

second scheme only for the first level of each term.

5. Note on Tables of Wavelengths for

Rare-Earth Spectra

Several of the more comprehensive collections of atomic

spectral wavelengths that include the rare earths are listed here, since we have usually not included these publications

in the references for particular spectra. The most complete

existing lists of observed lines for many rare-earth spectra

are at present unavailable in either published or report

form.

Gatterer, A., and Junkes, J., Atlas der Restlinien, Vol. II, Spektren der Seltenen Erden, Specola Vaticana, 347

pp. (1945).

Wavelength range, 2265-7600 A. Mainly first and second spectra. Main tables have a total of

41605 lines arranged by element, with Sc, Y,

Zr, and Th included in addition to the

lanthanides. Generally the most complete

collection of rare-earth lines having tables

separated according to element. Otherwise,

these tables have been superseded. No energy

level classifications.

Harrison, G. R., MIT Wavelength Tables, MIT Press,

Cambridge, Mass., 429 pp. (1969).

Wavelength range, 2000-10000 A. Mainly first and second spectra. Main table has all elements

and spectra together, arranged by wavelength.

Includes original measurements of thousands

of lines of the more complex rare-earth

spectra, and was used extensively in the

preparation of several other publications listed here. No energy level classifications.

Meggers, W. F., Corliss, C. H., and Scribner, B. F., Tables

of Spectral-Line Intensities, Nat. Bur. Stand. (U.S.),

Monogr. 145, Part I, 403 pp.; Part II, 228 pp. (1975).

Wavelength range 2000-9000 A. Mainly first and second spectra. Part I is arranged by

element. About 16000 of the strongest lines of

the rare-earth spectra are included, and the

tables for several of these spectra have lines and energy levels (for classified transitions)

that have not been published elsewhere. Part

II is arranged according to wavelength with all (70) elements together.

Moore, C. E., A Multiplet Table of Astrophysical Interest, Nat. Stand. Ref. Data Ser., Nat. Bur. Stand. (U.S.),

40, 253 pp. (1972). A reprint of the 1945 edition. Wavelength range, 2950-13000 A. Has

multiplet tables (by spectrum) and a finding

list (all included spectra together). Lines of

several rare-earth spectra (as available in 1945) are listed in the multiplet format especially

convenient for some users.

Wysocka-Lisek, J., Spectrum Lines of Rare Earths

Arranged by Wavelengths, Lubelskie Towarzystwo

Naukowe, Lublin, Poland, 583 pp. (1970).

Most complete published collection of spectrum

lines of the neutral and singly ionized rare earths for the region 2000-10000 A (58000 lines including lines of Sc, Y, Zr, and Th, in addition

to the lanthanides). Arranged by wavelength

with all elements together. No energy level

classifications.

Zaidel’, A. N., Prokof’ev, V. K., Raiskii, S. M., Slavnyi, V.

A., and Schreider, E. Ya., Tables of Spectral Lines,

IFI/Plenum, New York, 782 pp. (1970).

Part 1 has 52000 lines of 60 elements, including

the rare earths. This part is arranged by

wavelength, with all elements together (mainly

first and second spectra, range 2000-8000 A).

Part 2 has 38000 lines of 98 elements arranged

by element, and includes lines from third and

higher spectra. Both parts were revised to include material published in the 1960’s. The

wavelength range of Part 2 extends into the vacuum ultraviolet and further to the infrared.

For the rare earths, the main advantage of

Part 2 (relative to the other publications) is the

tabulation of the stronger lines of some third

and higher spectra. Also includes the energy of

the upper level (to the nearest 0.01 eV) for

classified lines.
12

6. State of Analyses of Rare-Earth Spectra

The table 10 below roughly summarizes the status of the

analyses for the first six spectra of the rare earths, based

on the data available for this compilation. Analyses of

spectra of ions in crystals or solutions are included only to the extent of indicating (by brackets) nine triply ionized

species for which the levels tabulated here are entirely

derived from such data. Analyses of the atomic and free-ion

spectra are indicated by numbers one to four, with the

following approximate meanings:

1. The spectrum has been well excited and measured over

the relevant optical range. For a first or second spectrum

the Zeeman effect has been observed. Practically all of the

strong lines are classified. (In practice the number of

“strong” lines varies from less than 100 to several thousand,

depending on the complexity of the spectrum.) The more

important configurations have been calculated; all the lower

levels and more than half of all the known levels have been

interpreted according to the calculations. More or refined

calculations might be needed, such as the inclusion of

additional configuration interactions, use of effective

interactions, recoupling transformations, or extension to additional configurations. Such additional calculations

probably would allow some extension and refinement of the

analysis, especially in the case of a first or second spectrum;

however, the analysis is now one of the most complete for

the type of spectrum.

2. These analyses are less complete than those described

above. Important configurations are not known or have not been interpreted theoretically. The wavelength descriptions are usually satisfactory, but in some cases further

observations are needed.

3. The analysis has progressed beyond the beginning

stages, but important configurations are not known relative

to the ground configuration; or the basic configurations have

not been calculated. More observations may be needed.

4. Only a beginning analysis exists. The number for a particular spectrum thus indicates

roughly the completeness of the analysis relative to other

spectra of the same type and level of complexity. The main

tables should, of course, be perused for details on the

analyses. Summary tables of “Observed Terms,” of the type

given in AEL Vols. I- III, have been omitted here as being

impractical for many of the complex rare-earth spectra with

extensive configuration interactions.

The energy levels for 57 of the atomic species in the

present compilation are from analyses of atomic or free-ion

spectra; 11 before 1960, there were no analyses at all for 35 of

these spectra. Also since 1960, there has been additional

work on all but 2 or 3 of the 22 spectra analyzed earlier. It

is clear from the table, however, that this progress on the

The table is a revised version of a similar summary made several years ago [Martin, 1972]. The

separated group of spectra in the upper part of the table belong to the Xe I and I I isoelectronic sequences; the 4/-electron orbit is not collapsed (rare-earth like) in the low-ionization members of these sequences. The first three Lu spectra are also separated off, since the analyzed configurations

include 4/ electrons only in the closed shell. Three additional spectra that have been analyzed, Sm XXXV, Gd XXXVII, and Dy XXXIX, are not shown.

11 Analyses of crystal or solution spectra are excluded from consideration in the following remarks.

rare earths during the past 15 years or so has in most cases not included the fourth and higher spectra. (No analyses of

third or fourth rare-earth spectra were carried out during

the 20 years from the late 1930’s to the late 1950’s.) More

complete data on energy levels and wavelengths for the rare

earths are needed in several important areas of research. It

is fortunate that work on a number of these difficult spectra

is now continuing or planned.

Status of analyses of rare-earth spectra. See text for explanation.

z I II III IV V VI

57 La 2 2 1

1 2 3 58 Ce 2 1 1 2

[ 4 4 59 Pr 2 3 1 1 2 60 Nd 2 2 3 [ ] 61 Pm 3 3 l ] 62 Sm 1 2 3 [ ] 63 Eu 2 2 2 [ 1 64 Gd 2 1 2 [ ] 65 Tb 2 3 2 2 66 Dy 2 2 4 1 1 67 Ho 2 3 2 [ 1 68 Er 2 2 2 1 1 69 Tm 1 1 1 1 1 70 Yb 2 1 1 1 71 Lu 1 2 2 2 1 1 3

7. Acknowledgments

The international community of spectroscopists has been

very generous in helping with this undertaking. We are

especially grateful to those colleagues in other laboratories

who have supplied unpublished data and theoretical results,

the following being only the most outstanding in this regard:

J. Blaise and his associates, especially J. F. Wyart, at the

Laboratoire Aime Cotton, Orsay; Zipora Goldschmidt and

associates in the Racah Institute of Physics, the Hebrew

University, Jerusalem; P. F. A. Klinkenberg, E. Meinders,

and T. A. M. van Kleef, at the Zeeman Laboratory,

Amsterdam; G. Smith, of the Department of Astrophysics,

Oxford; H. M. Crosswhite, formerly at the Johns Hopkins

University and now at the Argonne National Laboratory,

and W. T. Carnall, of the Argonne National Laboratory.

These and other contributors of unpublished material are

cited in the discussions of particular spectra.

We are very grateful to Charlotte E. Moore for the

example of her carefully done compilations of spectroscopic

data, especially the Atomic Energy Levels volumes, and for

the extensive bibliographic material that she maintained and

kept current in this laboratory for more than 20 years. Our colleagues in the Spectroscopy Section have

generously assisted us whenever called upon. We especially

thank C. H. Corliss, V. Kaufman, J. Reader, J. Sugar, and J. L. Tech for their expert help and advice on a variety of

problems. Reader and Sugar have also supplied unpublished

material.
13

K. G. Kessler, Chief of the Optical Physics Division, and

D. R. Lide, Jr., Chief of the Office of Standard Reference

Data, have supported this work over a period of years. Their encouragement and advocacy are much appreciated.

In the preparation of the tables, the data were first transferred to decks of punched cards which could be

conveniently revised and expanded to include new material

up to a cutoff date. After final checking, the coded punched

card records were transferred to magnetic tape and edited

to produce a final tape for automatic typesetting. The main

editing code was obtained by suitable modifications of edit- insertion programs of C. Messina and J. Hilsenrath [1970],

The modified code and its successful use to produce the

tables via automatic photocomposition (Linotron) are largely

due to Robert Thompson, of the Office of Standard

Reference Data, and to Rebecca Morehouse, Anne

Meininger, and the late Rubin Wagner of the Computer

Assisted Printing Section. Kathy Strine and the late Ruth

Peterson of the Spectroscopy Section did most of the

keypunching of the original cards and helped with the

checking. Mrs. Strine also typed most of the original

manuscript; Marsha Ahalt and Arlene Musgrove did the

later typing and keypunching, and helped with the

proofreading. Miriam Oland of the Computer Assisted

Printing Section retyped and coded the final manuscript for

typesetting via photocomposition. We are very grateful to

all these members of the NBS staff for this excellent

assistance.

8. References

Bacher, R. F., and Goudsmit, S., Atomic Energy States, 562 pp. (McGrawHill Book Co., New York, N.Y., 1932). Bibliographic Guide for Editors and Authors, 362 pp. (American Chemical

Society, Washington, D.C., 1974). Blaise, J., Camus, P., and Wyart, J. F., in Gmelin Handbuch der Anorganischen Chemie, Vol. 39, Part B4, pp. 124-334 (Springer-Verlag,

Berlin, 1976).

Cohen, E. R., and Taylor, B. N., J. Phys. Chem. Ref. Data 2, 663 (1973). Condon, E. U., and Shortley, G. H., The Theory of Atomic Spectra, 441 pp. (Cambridge University Press, 1935: reprinted 1951 and later years). Conway, J. G., and Wybourne, B. G., Phys. Rev. 139, 2325 (1963). de-Shalit, A., and Talmi, I., Nuclear Shell Theory, 573 pp. (Academic Press, New York, N.Y., 1963). El’yashevich, M. A., Spectra of the Rare Earths, 586 pp. in 2 books, AEC-tr- 4403/LK (1961). Available from National Technical Information Service

(U.S.), Springfield, VA 22161. [A translation of Spektry Redkikh Zemel

(State Publishing House of Technical-Theoretical Literature, Moscow,

1953).] Hagan, L., Nat. Bur. Stand. (U.S.), Spec. Publ. 363, Suppl. 1 (1977). Hagan, L., and Martin, W. C., Nat. Bur. Stand. (U.S.), Spec. Publ. 363, 103

pp. (1972). Judd, B. R., and Lindgren, I., Phys. Rev. 122, 1802 (1961). Marrus, R. A., and Nierenberg, W. A., in Topics on Radiofrequency

Spectroscopy, International School of Physics “Enrico Fermi,” Course XVII, pp. 118-156, (Academic Press, New York, N.Y., 1962). Martin, W. C., Opt. Pur. Apt 5, 181 (1972). Martin, W. C., Hagan, L., Reader, J., and Sugar, J., J. Phys. Chem. Ref. Data 3, 771 (1974). Messina, C. G., and Hilsenrath, J., Edit-Insertion Programs for Automatic

Typesetting of Computer Printout, Nat. Bur. Stand. (U.S.), Tech. Note

500, 50 pp. (1970). Moore, C. E., Nat. Bur. Stand. (U.S.), Spec. Publ. 306, Sec. 4, 55 pp. (1969). Moore, C. E., Atomic Energy Levels, Nat. Stand. Ref. Data Ser., Nat. Bur.

Stand. (U.S.), 35, Vol. I, 359 pp., Vol. II, 259 pp., Vol. Ill, 282 pp. (1971). [Reprint of NBS Circular 467, which originally appeared in 1949 (Vol. I), 1952 (Vol. II), and 1958 (Vol. III).] Nielson, C. W., and Roster, G. F., Spectroscopic Coefficients for the p", d", and f Configurations, 275 pp. (MIT Press, Cambridge, Mass., 1963). Racah, G., Phys. Rev. 61, 537 (1942a). Racah, G., Phys. Rev. 62, 438 (1942b). Racah, G., Phys. Rev. 63, 367 (1943). Racah, G., Phys. Rev. 76, 1352 (1949). Racah, G., in Transactions of the Joint Commission for Spectroscopy, J. Opt. Soc. Am. 50, 408 (1960). Russell, H. N., Shenstone, A. G., and Turner, L. A., Phys. Rev. 33, 900

(1929). van den Bosch, J. C., in Encyclopedia of Physics, S. Fliigge, Ed., Vol. 28, 448 pp. (Springer-Verlag, Berlin, 1957). White, H. E., Introduction to Atomic Spectra, 457 pp. (McGraw-Hill Book

Co., New York, N.Y., 1934). Wybourne, B. G., Spectroscopic Properties of Rare Earths, 236 pp. (John

Wiley & Sons, New York, N.Y., 1965).
14

9. Tables for the Introduction

Table 1. Allowed terms for LS coupling of equivalent electrons 3

Config.

2 S

>S

Allowed terms

p and p

5 2p°

p

2 and p

4 3 P ‘D S

p3 4 S° 2 D° 2 po

p

6 *s

d and d

9 2 D 1 GO)

d

2 and d 8 3 F 2 (ID >G 2 (20) S 0 (00)

3 p 2 (ID >D 2 (20)

d

3 and d

7 4 JT 3 (ID 2 H 3 (21) 2 F 3 (21) 2 D2 3 (21)

4 P 3 (ID 2 G 3 (21) 2 D1 1 GO) 2 P 3 (21)

d

4 and d6 5 D 4 GO) 3 F2 4 (21) ‘I 4 (22) 1 D1 2 (20)

3 H 4 (21) 3 D 4 (21) 1 G1 2 (20) 1 D2 4 (22)

3 G 4 (21) 3 P1 2 (ID ‘G2 4 (22) ‘SI 0 (00)

3 F1 2 (ID 3 P2 4 (21) 1 F 4 (22) ' S2 4 (22)

d

5 «S 5 (00) 4 P 3 (ID 2 G2 5 (22) 2 D2 3 (21)

4 G 5 (20) 2 I 5 (22) 2 F1 3 (21) 2 D3 5 (22)

4 F 3 (ID 2 H 3 (21) 2 F2 5 (22) 2 P 3 (21)

4 D 5 (20) 2 G1 3 (21) 2 D1 1 GO) 2 S 5 (22)

d‘° ‘S

f and /'3 2 P

° 1 (100) GO)

f

2 and /

12 3 H 2 (110) (ID 3 P 2 (110) (ID ‘G 2 (200) (20) ‘S 0 (000) (00)

3 F 2 (110) GO) ’I 2 (200) (20) ‘D 2 (200) (20)

f

3 and /“ 4 I° 3 (111) (20) 2 L° 3 (210) (21) 2 G°1 3 (210) (20) 2 D°2 3 (210) (21)

4 G° 3 (111) (20) 2 K° 3 (210) (21) 2 G°2 3 (210) (21) 2 P

° 3 (210) (ID

4 F

° 3 (111) GO) *r 3 (210) (20) 2 F°1 1 GOO) GO)

4 D° 3 (111) (20) 2 H°1 3 (210) (ID 2 F°2 3 (210) (21)

4 S° 3 (111) (00) 2 H°2 3 (210) (21) 2 D°1 3 (210) (20)

f

4 and f10 5 I 4 (111) (20) 3 H2 4 (211) (11) 3 P1 2 (110) (11) ‘G1 2 (200) (20)

5 G 4 (111) (20) 3 H3 4 (211) (21) 3 P2 4 (211) (ID ‘G2 4 (220) (20)

5 F 4 (111) GO) 3 H4 4 (211) (30) 3 P3 4 (211) (30) ‘G3 4 (220) (21)

5 D 4 (111) (20) 3 G1 4 (211) (20) ‘N 4 (220) (22) ‘G4 4 (220) (22)

5 S 4 (111) (00) 3 G2 4 (211) (21) ‘LI 4 (220) (21) ‘F 4 (220) (21)

3 M 4 (211) (30) 3 G3 4 (211) (30) ‘L2 4 (220) (22) ‘D1 2 (200) (20)

3 L 4 (211) (21) 3 F1 2 (110) GO) ‘K 4 (220) (21) D2 4 (220) (20)

3 K1 4 (211) (21) 3 F2 4 (211) (10) ‘11 2 (200) (20) ‘D3 4 (220) (21)

3 K2 4 (211) (30) 3 F3 4 (211) (21) ‘12 4 (220) (20) ‘D4 4 (220) (22)

3 I1 4 (211) (20) 3 F4 4 (211) (30) >13 4 (220) (22) ‘SI 0 (000) (00)

3 I2 4 (211) (30) 3 D1 4 (211) (20) ‘HI 4 (220) (21) •S2 4 (220) (22)

3H1 2 (110) (11) 3 D2 4 (211) (21) ’H2 4 (220) (22)
15

Table 1. Allowed terms for LS coupling- of equivalent electrons a — Continued

Config.

/

5 and /

/

6 and f

Allowed terms

6 H° 5 (110) (ID 4 F°3 5 (211) (21) 2 K°5 5 (221) (31)B 2 F°i 1 (100) GO)

ep° 5 (110) GO) 4p°4 5 (211) (30) 2I°1 3 (210) (20) 2 F°2 3 (210) (21)

6p° 5 (110) (ID 4 D°1 3 (111) (20) 2 I°2 5 (221) (20) 2 F°3 5 (221) GO)

4 M° 5 (211) (30) 4 D°2 5 (211) (20) 2 I°3 5 (221) (30) sp°4 5 (221) (21)

4 L° 5 (211) (21) 4 D°3 5 (211) (21) 2 I°4 5 (221) (31)A 2 F°5 5 (221) (30)

4 K°1 5 (211) (21) 4 P°1 5 (211) (ID 2 I°5 5 (221) (31)B 2 F°6 5 (221) (31)A

4 K°2 5 (211) (30) 4 P°2 5 (211) (30) 2 H°l 3 (210) (ID 2p°7 5 (221) (31)B

4 I°1 3 (111) (20) 4 go 3 (111) (00) 2 H°2 3 (210) (21) 2 D°1 3 (210) (20)

4 I°2 5 (211) (20) 2Q° 5 (221) (31) 2 H°3 5 (221) (ID 2 D°2 3 (210) (21)

4 I°3 5 (211) (30) 2 N° 5 (221) (31) 2 H°4 5 (221) (21) 2 D°3 5 (221) (20)

4 H°1 5 (211) (11) 2 M°1 5 (221) (30) 2 H°5 5 (221) (30) 2 D°4 5 (221) (21)

4 H°2 5 (211) (21) 2 M°2 5 (221) (31) 2 H°6 5 (221) (31)A 2 D°5 5 (221) (31)

4 H°3 5 (211) (30) 2 L°1 3 (210) (21) 2 H°7 5 (221) (31)B 2 P°1 3 (210) (ID

4 G°1 3 (111) (20) 2 L°2 5 (221) (21) 2 G°1 3 (210) (20) 2 P°2 5 (221) (ID

4 G°2 5 (211) (20) 2 L°3 5 (221) (31) 2 G°2 3 (210) (21) 2 P°3 5 (221) (30)

4 G°3 5 (211) (21) 2 K°1 3 (210) (21) 2 G°3 5 (221) (20) 2 P°4 5 (221) (31)

4 G°4 5 (211) (30) 2 K°2 5 (221) (21) 2 G°4 5 (221) (21)

4 F°1 3 (111) GO) 2 K°3 5 (221) (30) 2 G°5 5 (221) (30)

4 F°2 5 (211) GO) 2 K°4 5 (221) (31)A 2 G°6 5 (221) (31)

7 F 6 (100) GO) 3 K6 6 (221) (31)B 3 F8 6 (221) (31)A 16 6 (222) (40)A

5 L 6 (210) (21) 3 I1 4 (211) (20) 3 F9 6 (221) (31)B '17 6 (222) (40)B

5 K 6 (210) (21) 3 I2 4 (211) (30) 3 D1 4 (211) (20) 'HI 4 (220) (21)

5 I1 4 (111) (20) 3 I3 6 (221) (20) 3 D2 4 (211) (21) 'H2 4 (220) (22)

5 I2 6 (210) (20) 3J4 6 (221) (30) 3 D3 6 (221) (20) H3 6 (222) (30)

5 H1 6 (210) (ID 3 I5 6 (221) (31)A 3 D4 6 (221) (21) 'H4 6 (222) (40)

5 H2 6 (210) (21) 3 I6 6 (221) (31)B 3 D5 6 (221) (31) 'G1 2 (200) (20)

5 G1 4 (111) (20) 3 H1 2 (110) (ID 3 P1 2 (110) (ID 'G2 4 (220) (20)

5 G2 6 (210) (20) 3 H2 4 (211) (ID 3 P2 4 (211) (ID 'G3 4 (220) (21)

5 G3 6 (210) (21) 3 H3 4 (211) (21) 3 P3 4 (211) (30) 'G4 4 (220) (22)

5 F1 4 (111) GO) 3 H4 4 (211) (30) 3 P4 6 (221) (11) 'G5 6 (222) (20)

5 F2 6 (210) (21) 3 H5 6 (221) (ID 3 P5 6 (221) (30) G6 6 (222) (30)

5 D1 4 (111) (20) 3 H6 6 (221) (21) 3 P6 6 (221) (31) 'G7 6 (222) (40)A

5 D2 6 (210) (20) 3 H7 6 (221) (30) ] Q 6 (222) (40) G8 6 (222) (40)B

5 D3 6 (210) (21) 3 H8 6 (221) (31)A >N1 4 (220) (22) 'FI 4 (220) (21)

5p 6 (210) (ID 3 H9 6 (221) (31)B >N2 6 (222) (40) 'F2 6 (222) GO)

5 S 4 (111) (00) 3 G1 4 (211) (20) 'Ml 6 (222) (30) 'F3 6 (222) (30)

3 0 6 (221) (31) 3 G2 4 (211) (21) 'M2 6 (222) (40) 'F4 6 (222) (40)

3 N 6 (221) (31) 3 G3 4 (211) (30) 'Ll 4 (220) (21) 'D1 2 (200) (20)

3 M1 4 (211) (30) 3 G4 6 (221) (20) 'L2 4 (220) (22) 'D2 4 (220) (20)

3 M2 6 (221) (30) 3 G5 6 (221) (21) 'L3 6 (222) (40)A 'D3 4 (220) (21)

3 M3 6 (221) (31) 3 G6 6 (221) (30) >L4 6 (222) (40)B 'D4 4 (220) (22)

3 L1 4 (211) (21) 3 G7 6 (221) (31) •K1 4 (220) (21) 'D5 6 (222) (20)

3 L2 6 (221) (21) 3 F1 2 (110) GO) 'K2 6 (222) (30) 'D6 6 (222) (40)

3 L3 6 (221) (31) 3 F2 4 (211) GO) 'K3 6 (222) (40) >P 6 (222) (30)

3 K1 4 (211) (21) 3 F3 4 (211) (21) 'll 2 (200) (20) 'SI 0 (000) (00)

3 K2 4 (211) (30) 3 F4 4 (211) (30) '12 4 (220) (20) 'S2 4 (220) (22)

3 K3 6 (221) (21) 3 F5 6 (221) GO) 13 4 (220) (22) 'S3 6 (222) (00)

3 K4 6 (221) (30) 3 F6 6 (221) (21) '14 6 (222) (20) 'S4 6 (222) (40)

3 K5 6 (221) (31)A 3 F7 6 (221) (30) '15 6 (222) (30)
16

TABLE 1. Allowed terms for LS coupling of equivalent electrons a — Continued

Config.

/

7

f

14

Allowed terms

8 S

° 7 (000) (00) 4 G°6 7 (220) (21) 2 K°1 3 (210) (21) 2 G°6 5 (221) (31)

SJ° 7 (200) (20) 4 G°7 7 (220) (22) 2 K°2 5 (221) (21) 2 G°7 7 (222) (20)

«H° 5 (110) (11) 4po i 3 (111) GO) 2 K°3 5 (221) (30) 2 G°8 7 (222) (30)

S G° 7 (200) (20) 4 F°2 5 (211) GO) 2 K°4 5 (221) (31)A 2 G°9 7 (222) (40)A

(>jr° 5 (110) GO) 4 F°3 5 (211) (21) 2 K°5 5 (221) (31)B 2 G°10 7 (222) (40)B

6 D° 7 (200) (20) 4p°4 5 (211) (30) 2 K°6 7 (222) (30) 2 F°1 1 (100) GO)

Bp° 5 (110) (ID 4 F°5 7 (220) (21) 2 K°7 7 (222) (40) 2 F°2 3 (210) (21)

4 N° 7 (220) (22) 4 D°1 3 (111) (20) *I°1 3 (210) (20) 2 F°3 5 (221) GO)

4 M° 5 (211) (30) 4 D°2 5 (211) (20) 2 I°2 5 (221) (20) 2 F°4 5 (221) (21)

4 L°1 5 (211) (21) 4 D°3 5 (211) (21) 2 1 °3 5 (221) (30) 2 F°5 5 (221) (30)

4 L°2 7 (220) (21) 4 D°4 7 (220) (20) 2 I°4 5 (221) (31)A 2 F°6 5 (221) (31)A

4 L°3 7 (220) (22) 4 D°5 7 (220) (21) 2 I°5 5 (221) (31)B 2p°7 5 (221) (31)B

4 K°1 5 (211) (21) 4 D°6 7 (220) (22) 2 I°6 7 (222) (20) 2 F°8 7 (222) GO)

4 K°2 5 (211) (30) 4 P°1 5 (211) (ID 2 I°7 7 (222) (30) 2 F°9 7 (222) (30)

4 K°3 7 (220) (21) 4 P°2 5 (211) (30) 2 I°8 7 (222) (40)A 2 F°10 7 (222) (40)

4 1° 1 3 (111) (20) 4 S°1 3 (111) (00) 2 I°9 7 (222) (40)B 2 D°1 3 (210) (20)

4 I°2 5 (211) (20) 4 S°2 7 (220) (22) 2 H°1 3 (210) (11) 2 D°2 3 (210) (21)

4 I°3 5 (211) (30) 2 Q° 7 (222) (40) 2 H°2 3 (210) (21) 2 D°3 5 (221) (20)

4 I°4 7 (220) (20) "0° 5 (221) (31) 2 H°3 5 (221) (ID 2 D°4 5 (221) (21)

4 I°5 7 (220) (22) 2 N°1 5 (221) (31) 2 H°4 5 (221) (21) 2 D°5 5 (221) (31)

4 H°1 5 (211) (ID 2 N°2 7 (222) (40) 2 H°5 5 (221) (30) 2 D°6 7 (222) (20)

4 H°2 5 (211) (21) 2 M°1 5 (221) (30) 2 H°6 5 (221) (31)A 2 D°7 7 (222) (40)

4 H°3 5 (211) (30) 2 M°2 5 (221) (31) 2 H°7 5 (221) (31)B 2 p°i 3 (210) (ID

4 H°4 7 (220) (21) 2 M°3 7 (222) (30) 2 H°8 7 (222) (30) 2p°2 5 (221) (11)

4 H°5 7 (220) (22) 2 M°4 7 (222) (40) 2 H°9 7 (222) (40) 2p°3 5 (221) (30)

4 G°1 3 (111) (20) 2 L°1 3 (210) (21) 2 G°1 3 (210) (20) 2 P°4 5 (221) (31)

4 G°2 5 (211) (20) 2 L°2 5 (221) (21) 2 G°2 3 (210) (21) 2 P°5 7 (222) (30)

4 G°3 5 (211) (21) 2 L°3 5 (221) (31) 2 G°3 5 (221) (20) 2 S° 1 7 (222) (00)

4 G°4 5 (211) (30) 2 L°4 7 (222) (40)A 2 G°4 5 (221) (21) 2 S°2 7 (222) (40)

4 G°5 7 (220) (20) 2 L°5 7 (222) (40)B 2 G°5 5 (221) (30)

>S

From Nielson and Foster (1963), with some rearrangement. (By permission of the M. I. T. Press.)
17

Table 2. Allowed J values for lN equivalent electrons

(jj coupling).

lN

J Allowed J values

ll/2 %

l

2

1/2 0

h/2 and l 3m %

0, 2

Z3/2 0

hi2 and /|/2 %

lt,2 and Z5/2 o, 2, 4

l 3

, 5/2 %, %, %

l 65/2 0

/ 7/2 and Z;

/2 7/2 and / 6

, 7/2 7/2 0, 2, 4, 6

/ 3 and/5

^ 7/2 ailU f 7/2 %, %, 7/2 , %, “A, 15/2

7/2 0, ,2, ,2, 2 4, A, 5, 6, 8

/ 8

7/2 0
18

TABLE 3. Corrected Lande g-values for terms of odd multiplicity

Multiplicity

Singlets Triplets Quintets Septets Nonets Undecets

Term

1 3 5 7 9 11

J 9 J 9 J 9 J 9 J 9 J 9

S 0

1 2.002319 2 2.002319 3 2.002319 4 2.002319 5 2.002319

P 1 1.000000 2 1.501160 3 1.668213 4 1.751739 5 1.801855 6 1.835266

1 1.501160 2 1.835266 3 1.918793 4 1.952203 5 1.968909

0 1 2.503479 2 2.336426 3 2.252899 4 2.202783

D 2 1.000000 3 1.334106 4 1.501160 5 1.601392 6 1.668213 7 1.715942

2 1.167053 3 1.501160 4 1.651507 5 1.735034 6 1.787537

1 0.198840 2 1.501160 3 1.751739 4 1.851971 5 1.902087

0.498840 1 1.501160 2 2.002319 3 2.085846 4 2.102551

0 1 3.004638 2 2.670532 3 2.503479

F 3 1.000000 4 1.250580 5 1.400928 6 1.501160 7 1.572754 8 1.626450

3 1.083527 4 1.350812 5 1.501160 6 1.596619 7 1.662247

2 0.665894 3 1.250580 4 1.501160 5 1.634802 6 1.715942

2 1.000000 3 1.501160 4 1.701623 5 1.801855

1 -0.002318 2 1.501160 3 1.835266 4 1.952203

1 1.501160 2 2.169372 3 2.252899

0 1 3.505798 2 3.004638

G 4 1.000000 5 1.200464 6 1.334106 7 1.429565 8 1.501160 9 1.556844

4 1.050116 5 1.267285 6 1.405701 7 1.501160 8 1.570765

3 0.749420 4 1.150348 5 1.367517 6 1.501160 7 1.590652

3 0.916473 4 1.300696 5 1.501160 6 1.620483

2 0.331787 3 1.167053 4 1.501160 5 1.668213

2 0.832947 3 1.501160 4 1.751739

1 -0.503478 2 1.501160 3 1.918793

1 1.501160 2 2.336426

0 1 4.006958

H 5 1.000000 6 1.167053 7 1.286377 8 1.375870 9 1.445475 10 1.501160

5 1.033411 6 1.214783 7 1.340073 8 1.431554 9 1.501160

4 0.799536 5 1.100232 6 1.286377 7 1.411667 8 1.501160

4 0.899768 5 1.200464 6 1.381836 7 1.501160

3 0.498840 4 1.050116 5 1.334106 6 1.501160

3 0.749420 4 1.250580 5 1.501160

2 -0.002318 3 1.083527 4 1.501160

2 0.665894 3 1.501160

1 -1.004637 2 1.501160

10

1.501160

I 6 1.000000 7 1.143188 8 1.250580 9 1.334106 10 1.400928 11 1.455600

6 1.023865 7 1.178986 8 1.292343 9 1.378654 10 1.446488

5 0.832947 6 1.071594 7 1.232681 8 1.348028 9 1.434338

5 0.899768 6 1.143188 7 1.304275 8 1.417633

4 0.599072 5 1.000000 6 1.238647 7 1.393768

4 0.749420 5 1.133643 6 1.357971

3 0.248261 4 0.949884 5 1.300696

3 0.582367 4 1.200464

2 -0.336425 3 1.000000

2 0.498840

1 -1.505797
19

TABLE 3. Corrected Lande (/-values for terms of odd multiplicity — Continued

Multiplicity

Term Sing-lets Triplets Quintets Septets Nonets

"

Undecets

1 3

5

7 9 11

./ 9 ./ 9 ./ 9 ./ 9 -/ 9 ./ 9

K 7 1.000000 8 1.125290 9 1.222738 10 1.300696 11 1.364480 12 1.417633

7 1.017899 8 1.153132 9 1.256148 10 1.337144 11 1.402446

6 0.856812 7 1.053696 8 1.194895 9 1.300696 10 1.382704

6 0.904541 7 1.107391 8 1.250580 9 1.356380

5 0.665894 6 0.976135 7 1.178986 8 1.320185

5 0.766126 6 1.071594 7 1.268478

4 0.398608 5 0.899768 6 1.190918

4 0.599072 5 1.066821

3 -0.002318 4 0.849652

3 0.415314

2 -0.670531

L 8 1.000000 9 1.111369 10 1.200464 11 1.273360 12 1.334106 13 1.385507

8 1.013921 9 1.133643 10 1.227800 11 1.303733 12 1.366232

7 0.874710 8 1.041763 9 1.167053 10 1.264248 11 1.341700

7 0.910507 8 1.083527 9 1.211601 10 1.309808

6 0.713623 7 0.964203 8 1.139211 9 1.267285

6 0.785217 7 1.035797 8 1.208817

5 0.498840 6 0.880676 7 1.125290

5 0.632483 6 1.000000

4 0.198145 5 0.799536

4 0.448724

3 -0.252898

M 9 1.000000 10 1.100232 11 1.182240 12 1.250580 13 1.308406 14 1.357971

9 1.011137 10 1.118456 11 1.205020 12 1.276280 13 1.335942

8 0.888631 9 1.033411 10 1.145792 11 1.235393 12 1.308406

8 0.916473 9 1.066821 10 1.182240 11 1.273360

7 0.749420 8 0.958237 9 1.111369 10 1.227800

7 0.803116 8 1.013921 9 1.167053

6 0.570435 7 0.874710 8 1.083527

6 0.665894 7 0.964203

5 0.331787 6 0.785217

5 0.498840

4 -0.002318

N 10 1.000000 11 1.091120 12 1.167053 13 1.231304 14 1.286377 15 1.334106

10 1.009112 11 1.106307 12 1.186329 13 1.253333 14 1.310242

9 0.899768 10 1.027336 11 1.129087 12 1.212029 13 1.280870

9 0.922042 10 1.054672 11 1.159460 12 1.244155

8 0.777262 9 0.955452 10 1.091120 11- 1.197427

8 0.819026 9 1.000000 10 1.136680

7 0.624130 8 0.874710 9 1.055684

7 0.695725 8 0.944316

6 0.427246 7 0.785217

6 0.546570

5 0.164734
20

Table: 3. Corrected Lande p-values for terms of odd multiplicity —Continued

Multiplicity

Singlets Triplets Quintets Septets Nonets Undecets

Term

1 3

5

7 9 1

1

./ 9 ./ 9 ./ 9 ./ 9 J 9 -/ 9

0 11 1.000000 12 1.083527 13 1.154203 14 1.214783 15 1.267285 16 1.313225

11 1.007593 12 1.096377 13 1.170725 14 1.233874 15 1.288167

10 0.908880 11 1.022780 12 1.115652 13 1.192754 14 1.257739

10 0.927104 11 1.045560 12 1.141353 13 1.220290

9 0.799536 10 0.954440 11 1.075933 12 1.173478

9 0.832947 10 0.990888 11 1.113900

8 0.665894 9 0.877494 10 1.036448

8 0.721578 9 0.933179

7 0.498840 8 0.791184

7 0.588333

6 0.284058

Q 12 1.000000 13 1.077101 14 1.143188 15 1.200464 16 1.250580 17 1.294800

12 1.006425 13 1.088116 14 1.157507 15 1.217169 16 1.269005

11 0.916473 12 1.019275 13 1.104638 14 1.176599 15 1.238051

11 0.931660 12 1.038551 13 1.126667 14 1.200464

10 0.817760 11 0.954440 12 1.064251 13 1.154203

10 0.845096 11 0.984813 12 1.096377

9 0.699304 10 0.881544 11 1.022780

9 0.743852 10 0.927104

8 0.554525 9 0.799536

8 0.624130

7 0.373551
21

TABLE 4. Corrected Lande (/-values for terms of even multiplicity

Multiplicity

Doublets Quartets Sextets Octets Decets

Term

2 4 6 8 10

J a J a J a J a J a

S 1/2 2.002319 3/2 2.002319 5/2 2.002319 7/2 2.002319 9/2 2.002319

P 3/2 1.334106 5/2 1.601392 7/2 1.715942 9/2 1.779582 11/2 1.820079

1/2 0.665894 3/2 1.735034 5/2 1.887768 7/2 1.938680 9/2 1.961821

1/2 2.670532 3/2 2.403247 5/2 2.288696 7/2 2.225057

D 5/2 1.200464 7/2 1.429565 9/2 1.556844 11/2 1.637839 13/2 1.693913

3/2 0.799536 5/2 1.372290 7/2 1.588664 9/2 1.698586 11/2 1.764006

3/2 1.200464 5/2 1.658667 7/2 1.811401 9/2 1.880826

1/2 -0.002318 3/2 1.868677 5/2 2.059595 7/2 2.097778

1/2 3.338745 3/2 2.804175 5/2 2.575073

F 7/2 1.143188 9/2 1.334106 11/2 1.455600 13/2 1.539710 15/2 1.601392

5/2 0.856812 7/2 1.238647 9/2 1.435351 11/2 1.553729 13/2 1.632232

5/2 1.028638 7/2 1.397746 9/2 1.577093 11/2 1.679895

3/2 0.398608 5/2 1.315015 7/2 1.620483 9/2 1.759330

3/2 1.066821 5/2 1.715942 7/2 1.906860

1/2 -0.670531 3/2 2.002319 5/2 2.231421

1/2 4.006958 3/2 3.205102

G 9/2 1.111369 11/2 1.273360 13/2 1.385507 15/2 1.467749 17/2 1.530640

7/2 0.888631 9/2 1.172115 11/2 1.343452 13/2 1.457469 15/2 1.538501

7/2 0.984090 9/2 1.273360 11/2 1.441581 13/2 1.549991

5/2 0.570435 7/2 1.143188 9/2 1.415102 11/2 1.567747

5/2 0.856812 7/2 1.365926 9/2 1.597342

3/2 -0.002318 5/2 1.257739 7/2 1.652303

3/2 0.933179 5/2 1.773218

1/2 -1.338744 3/2 2.135962

1/2 4.675170

H 11/2 1.091120 13/2 1.231304 15/2 1.334106 17/2 1.412720 19/2 1.474783

9/2 0.908880 11/2 1.133175 13/2 1.282705 15/2 1.389136 17/2 1.468576

9/2 0.969627 11/2 1.203268 13/2 1.354667 15/2 1.459888

7/2 0.665894 9/2 1.070871 11/2 1.301397 13/2 1.447189

7/2 0.824992 9/2 1.212613 11/2 1.427563

5/2 0.284058 7/2 1.047729 9/2 1.394853

5/2 0.684985 7/2 1.334106

3/2 -0.403246 5/2 1.200464

3/2 0.799536

1/2 -2.006957

I 13/2 1.077101 15/2 1.200464 17/2 1.294800 19/2 1.369275 21/2 1.429565

11/2 0.922899 13/2 1.107942 15/2 1.239770 17/2 1.338244 19/2 1.414493

11/2 0.964954 13/2 1.159343 15/2 1.294800 17/2 1.394101

9/2 0.726640 11/2 1.035046 13/2 1.231304 15/2 1.365552

9/2 0.827885 11/2 1.133175 13/2 1.323826

7/2 0.443156 9/2 0.969627 11/2 1.259341

7/2 0.665894 9/2 1.151867

5/2 -0.002318 7/2 0.952271

5/2 0.513159

3/2 -0.804174
22

TABLE 4. Corrected Lande (/-values for terms of even multiplicity — Continued

Multiplicity

Doublets Quartets Sextets Octets Decets

Term

2 4 6 8 10

J g .1 g J g ./ g ./ g

K 15/2 1.066821 17/2 1.176880 19/2 1.263768 21/2 1.334106 23/2 1.392212

13/2 0.933179 15/2 1.090405 17/2 1.207911 19/2 1.298937 21/2 1.371460

13/2 0.964019 15/2 1.129712 17/2 1.251356 19/2 1.344155

11/2 0.768696 13/2 1.015420 15/2 1.184741 17/2 1.307212

11/2 0.838788 13/2 1.087382 15/2 1.255493

9/2 0.544400 11/2 0.936917 13/2 1.179903

9/2 0.686142 11/2 1.063083

7/2 0.220418 9/2 0.868382

7/2 0.306795

5/2 -0.288695

L 17/2 1.058960 19/2 1.158261 21/2 1.238647 23/2 1.305054 25/2 1.360835

15/2 0.941040 17/2 1.077579 19/2 1.183382 21/2 1.267700 23/2 1.336431

15/2 0.964624 17/2 1.108610 19/2 1.218551 21/2 1.305054

13/2 0.799536 15/2 1.003931 17/2 1.152055 19/2 1.263768

13/2 0.850937 15/2 1.058960 17/2 1.207911

11/2 0.614493 13/2 0.922899 15/2 1.129712

11/2 0.712622 13/2 1.015420

9/2 0.362161 11/2 0.838788

9/2 0.544400

7/2 -0.002318

M 19/2 1.052754 21/2 1.143188 23/2 1.217895 25/2 1.280649 27/2 1.334106

17/2 0.947246 19/2 1.067826 21/2 1.163940 23/2 1.242300 25/2 1.307378

17/2 0.965865 19/2 1.092947 21/2 1.192993 23/2 1.273677

15/2 0.823120 17/2 0.996897 19/2 1.128116 21/2 1.230347

15/2 0.862427 17/2 1.040341 19/2 1.173333

13/2 0.665894 15/2 0.917456 17/2 1.096198

13/2 0.737855 15/2 0.988208

11/2 0.460290 13/2 0.830377

11/2 0.586456

9/2 0.179921

N 21/2 1.047729 23/2 1.130737 25/2 1.200464 27/2 1.259861 29/2 1.311065

19/2 0.952271 21/2 1.060181 23/2 1.148169 25/2 1.221253 27/2 1.282902

19/2 0.967343 21/2 1- 080933 23/2 1.172573 25/2 1.247981

17/2 0.841739 19/2 0.992464 21/2 1.109985 23/2 1.203950

17/2 0.872771 19/2 1.027633 21/2 1.147339

15/2 0.705200 17/2 0.916215 19/2 1.072850

15/2 0.760230 17/2 0.972072

13/2 0.532251 15/2 0.830981

13/2 0.624773

11/2 0.306087

0 23/2 1.043579 25/2 1.120278 27/2 1.185615 29/2 1.241939 31/2 1.290996

21/2 0.956421 23/2 1.054038 25/2 1.135127 27/2 1.203536 29/2 1.262008

21/2 0.968872 23/2 1.071470 25/2 1.155916 27/2 1.226578

19/2 0.856812 21/2 0.989624 23/2 1.095874 25/2 1.182645

19/2 0.881932 21/2 1.018677 23/2 1.127251

17/2 0.736232 19/2 0.917101 21/2 1.056030

17/2 0.779676 19/2 0.962319

15/2 0.587280 17/2 0.835533

15/2 0.658032

13/2 0.398608
23

TABLE 4. Corrected Lande ^-values for terms of even multiplicity — Continued

Multiplicity

Doublets Quartets Sextets Octets Decets

Term

2 4 6 8 10

./ 9 J 9 J 9 ./ 9 J 9

Q 25/2 1.040093 27/2 1.111369 29/2 1.172814 31/2 1.226330 33/2 1.273360

23/2 0.959907 25/2 1.049002 27/2 1.124170 29/2 1.188423 31/2 1.243966

23/2 0.970366 25/2 1.063851 27/2 1.142091 29/2 1.208491

21/2 0.869263 23/2 0.987798 25/2 1.084640 27/2 1.165133

21/2 0.890015 23/2 1.012202 25/2 1.111369

19/2 0.761353 21/2 0.919067 23/2 1.043579

19/2 0.796522 21/2 0.956421

17/2 0.630725 19/2 0.841739

17/2 0.686581

15/2 0.469360
24

J= 1 -1.500

-1.000

-0.500

0.000

0.500

1.000

1.500

2.000

2.500

3.000

3.500

4.000

n I

9 H

7 G

5 F

3 D

'P

3 P

5 D

7 F

9 G

"H

3 S

5 P

7 D

9 P

n G

J = 2

-0.667 U K

-0.333 9 I 0.000 7 H

0.333 5 G

0.500 "I

0.667 3 F

9 H

0.833 7 G

1.000 *D

5 F

1.167 3 D

1.500 3 P

5 D

7 F

9 G

n H

1.833 5?

2.000 5 S

7 D

2.167 9 p

2.333 7 P

n G

2.667 9 D

3.000 up

II CO

-0.250 "L

0.000 9 K

0.250 7 I 0.417 »K

0.500 5 H

0.583 9 I 0.750 3 G

7 H

0.917 5 G

1.000 ip

»I

1.083 3 F

9 H

1.167 7 G

1.250 5 F

1.333 3 D

1.500 5 D

.

TABLE 5. Lande p-values for terms of odd multiplicity in order of increasing g

.7=3 — Cont. .7=5--Cont.

1.500 7 F 0.900 9 K

9 G 1.000 H

»H 7 I 1.667 sp 1.033 3 H

1.750 7 D 1.067 11 K

1.833 9 p 1.100 5 H

1.917 7 P 1.133 9 I n G 1.200 3 G

2.000 7 S

7 H

2.083 9 D 1.267 5 G

2.250 9 P 1.300 U I up 1.333 9 H

2.500 "D 1.367 7 G

1.400 5 F

J == 4 1.500 7 F

9 G

0.000 "M n H

0.200 9 L 1.600 7 D

0.400 7 K 1.633 9 p

0.450 n L 1.667 »G

0.600 5 1 1.733 9 D

9 K 1.800 9 P

0.750 7 I lip

0.800 3 H 1.900 11 D

0.850 n K 1.967 up

0.900 5 H 2.000 •>S 0 950 9 I 1.000 'G .7 = 6 1.050 3 G

7 H 0.286 “O

1.150 5 G 0.429 9 N

1.200 11 1 0.548 u N

1.250 3 F 0.571 7 M

9 H 0.667 9 M

1.300 7 G 0.714 5 L

1.350 5 F 0.786 7 L

1.500 5 D

U M

7 F

0.857 3 K

9 G

0.881 9 L

11 H 0.905 5 K

1.650 7 D 0.976 7 K

1.700 9p 1.000 ‘I 1.750 7 P "L

n G 1.024 3 I 1.850 9 D 1.071 5 1 1.950 9 P

9 K

lip 1.143 7 I 2.000 9 S

1.167 3 H

2.100 »D 1.191 11 K

2.200 up 1.214 5 H

1.238 9 I

.7 = 5 1.286 7 H

1.333 5 G

0.167 n N 1.357 n I 0.333 9 M 1.381 9 H

0.500 7 L 1.405 7 G

“M 1.500 7 F

0.633 9 L

9 G

0.667 5 K 11 H

0.767 7 K 1.595 9 p

0.800 U L 1.619 n G

0.833 3 I 1.667 9 D

0.900 5 1 1.714 up

-7 = 6 — Cont.

1.786

1.833

n D

up

J= 7

0.375

0.500

0.589

0.625

0.696

0.750

0.786

0.804

0.875

0.911 0.964

1.000

1.018

1.036

1.054 1.107

1.125

1.143

1.179

1.232

1.268 1.286

1.304

1.339

1.393

1.411 1.429

1.500

1.571 1.589

1.661 1.714

0.556

0.625

0.667

0.722

0.778

0.792

0.819

0.875

0.889

0.917

0.944

0.958

1.000

1.014

1.042

1.083

1.125 1.139

"Q

9 0

”0

7 N

9 N

5 M

11 N

7 M

3 L

9 M

5 L

7 L

n M

K

3 K

9 L

5 K

7 K

n L

3 I

5 I

9 K

7 I U K

5 H

9 I

7 H

“I

9 H

7 G

9 G

>'H 9p n G

up

"D

J= 8

9 Q

U Q

7 0

9 o

5 N

"O

7 N

9 N

3 M

5 M

nN

7 M

3 L

9 M

5 L

7 L

n M

3 K

9 L

.7=8 — Cont.

1.153 5 K

1.194 7 K

1.208 “L

1.250 5 1

9 K

1.292 7 I 1.319 U K

1.347 9 I 1.375 7 H

1.417 11 1 1.431 9 H

1.500 9 G

'H

1.569 "G

1.625 up

.7=9

0.700 7 Q

0.744 9 Q

0.800 5 0

"Q

0.833 7 0

0.878 9 0

0.900 3 N

0.902 5 N

0.906 7 N

0.933 “0

1.000 >M

9 N

1.011 3 M

1.033 5 M

1.056 "N

1.067 7 M

1.111 3 L

9 M

1.133 5 L

1.167 7 L

n M

1.211 9 L

1.222 5 K

1.256 7 K

1.267 >L

1.300 9 K

1.333 7 I 1.356 "K

1.378 9 I 1.433 “I

1.444 9 H

1.500 "H

1.556 “G

J= 10

0.818 5 Q

0.845 7 Q

0.882 9Q

0.909 3 0

0.927 5 0

"Q

0.955 7 0

0.991 9 0

./= 10 — Cont.

1.000

1.009

1.027

1.036

1.055

1.091 1.100

1.118

1.136

1.145

1.182 1.200

1.227

1.264 1.300

1.309

1.336

1.382 1.400

1.445

1.500

>N

3 N

5 N

11 0

7 N

9 N

3 M

5 M

>'N

7 M

9 M

5 L

7 L

11 M

9 L

7 K

n L

9 K

U K

9 I n I n H

J= 11

0.917

0.932

0.955

0.985

1.000

1.008

1.023

1.045

1.076

1.091 1.106

1.114

1.129

1.159 1.182

1.197

1.205 1.235

1.273

1.303

1.341 1.364 1.402

1.455

3 Q

5 Q

7 Q

9 Q

>0

3 0

5 0

n Q

7 0

9 0

3 N

5 N

"O

7 N

9 N

5 M

n N

7 M

9 M

7 L

n M

9 L

U L

9K

“K

”1

.7 = 12

1.000 1.006

1.019

1.038

1.064

1.083

1.096

1.115

'Q

3 Q

5 Q

7 Q

9 Q

3 0

5 0

“Q

7 0

= II C\S 1 Oo3r+-

1.141 9 0

1.167 5 N

1.173 "0

1.186 7 N

1.212 9 N

1.244 U N

1.250 7 M

1.276 9 M

1.308 U M

1.333 9 L

1.365 11 L

1.417 U K

II CO

1.077 3 Q

1.088 5 Q

1.104 7 Q

1.126 9 Q

1.154 5 0

"Q

1.170 7 0

1.192 9 0

1.220 >‘0

1.231 7 N

1.253 9 N

1.280 “N

1.308 9 M

1.335 uM

1.385 n L

II t-H

1.143 5 Q

1.157 7 Q

1.176 9 Q

1.200 U Q

1.214 7 0

1.233 9 0

1.257 •>0 1.286 9 N

1.310 uN

1.357 “M

7= 15

1.200 7 Q

1.217 9 Q

1.238 n Q

1.267 9 0

1.288 UQ

1.333 UN

J= 16

1.250 9 Q

1.268 U Q

1.312 UQ

J= 17

1.294 "Q
25

TABLE 6. Lande gr-values for terms of even multiplicity in order of increasing g

J = 1/2 J = 7/2 — Cont.

- 2.000 i° H 0.508 ,0 K

J = 11/2 — Cont. J= 15/2 -Cont.

-1.333 8 G 0.667 4 H

-0.667 «F 8 I 0.000 4 D 0.825 6 H

0.667 - P 0.889 2 G

2.000 2 S 0.952 101 2.667 4 P 0.984 4 G

3.333 fi D 1.048 8 H

4.000 S F 1.143 2 f

4.667 .° G

1.238 «G

4 JT .7=3/2

1.333 i°H

-0.800 !«! 1.365 8 G

-0.400 8 H 1.397 6 F

0.000 6 G 1.429 4 D

0.400 4 F 1.587 6 D

0.800 2 D 1.619 8 F

i° H 1.651 ,° G

0.933 8 G 1.714 ep

1.067 6 F 1.809 8 D

1.200 4 D 1.905 iof

1.333 2 P

1.937 8 P

1.733 4 P

2.000 8 S

1.867 r, D

2.000 4 S

2.095 i°D

8 F

2.222 iop

2.133 i° G

fi p

J = 9/2 2.400

2.800 8 D 0.182 10 M

3.200 lop 0.364 8 L

0.545 6 K

.7 = 5/2 10 L

0.687 8 K

-0.286 io K 0.727 4 I 0.000 8 I 0.828 «I 0.286 6 H 0.869 i°K

0.514 ,01 0.909 2 H

0.571 4 G 0.970 4 H

0.686 8 H 8 I 0.857 2 F 1.071 «H

6 G 1.111 2 G

1.029 4JT 1.152 ,01 1.200 2 D 1.172 4 G

10 H 1.212 8 H

1.257 8 G 1.273 6 G

1.314 6 F 1.333 4 JT 1.371 4 D 1.394 10 H

1.600 4 P 1.414 8 G

1.657 «D 1.434 6 F

1.714 8 F 1.556 «D

1.772 i° G 1.576 8F

1.886 ep 1.596 ,°G

2.000 6 S 1.697 8 D

2.057 8 D 1.758 iop 2.229 iop 1.778 8 P

2.286 8 P 1.879 10 D

2.572 i°D 1.960 iop

2.000 10 S

.7=7/2 J = 11/2

0.000 40 L 0.308 10 N

0.222 8 K 0.462 8 M

0.444 H 0.587 10 M

0.615 6 L 0.659 h>0 0.713 8 L

' 0.706 6 N

0.769 4 K 0.761 8 N

0.839 6 K 0.824 4 M

10 L 0.831 ,°N

0.923 2 I 0.863 «M

0.937 8 K 0.918 8 M

0.965 4 I 0.941 2 L

1.035 «I 0.965 4 L

1.063 ,o K 0.988 ,°M

1.091 2 H 1.004 6 L

1.133 4 H 1.059 8 L

8 I 1.067 2 K

1.203 6 H 1.090 4 K

1.259 10J 1.129 6 K

1.273 4 G 4(1 L

1.301 8 H 1.184 8 K

1.343 6 G 1.200 4 I 1.427 ,°H 1.239 «I 1.441 8 G 1.255 ,°K

1.455 6 F 1.294 8 I 1.552 8 F 1.333 6 H

1.566 10 G 1.365 4 °I 1.636 8 D 1.388 8 H

1.678 iop 1.459 4 ° H

1.762 ,°D 1.467 8 G

1.818 iop 1.537

1.600

10 G

iop

J = 13/2

0.400

0.533

lOQ

8 N

/ = 17/2

0.626 ,o N 0.632 8 Q

0.667 6 M 0.687 10 Q

0.738 8 M 0.737 6 0

0.800 4 L 0.780 8 0

0.831 ,°M 0.836 40 O

0.851 6 L 0.842 4 N

0.923 8 L 0.873 «N

0.933 2 K 0.916 8 N

0.964 4 K 0.947 2 M

1.015 6 K 0.966 4 M

10 L 0.972 40 N

1.077 2 I 0.997 6 M

1.087 8 K 1.040 8 M

1.108 4 I 1.059 2 L

1.159 «I 1.077 4 L

1.179 ,°K 1.096 10 M

1.231 4 H 1.108 6 L

8 I 1.152 8 L

1.282 6 H 1.176 4 K

1.323 lOj 1.207 6 K

1.354 8 H 10 L

1.385 6 G 1.251 8 K

1.446 ,°H 1.294 6 I 1.456 8 G 1.307 40 K

1.538 8 F 1.337 8 I 1.549 I0 G 1.393 4 °I 1.631 iop 1.412 8 H

1.692 iop 1.467 10 H

J = 15/2 1.529 ,0 G

J= 19/2 0.471 i°Q

0.588 8 0 0.762 6 Q

J= 19/2 -Cont. J = 23/2 — Cont.

0.797 8 Q

0.842 10 Q

0.857 4 0

0.882 «0

0.917 8 0

0.952 2 N

0.962 10Q

0.967 4 N

0.992 6 N

1.028 8 N

1.053 2 M

1.068 4 M

1.073 10 N

1.093 6 M

1.128 8 M

1.158 4 L

1.173 40 M

1.183 6 L

1.218 8 L

1.263 6 K

10 L

1.298 8 K

1.343 ,°K 1.368 8 I 1.414 ,„i 1.474 4(1 H

J = 21/2

0.870 4 Q

0.890 6 Q

0.919 8 Q

0.957 2 0

10 Q

0.969 4 0

0.990 6 0

1.019 8 0

1.048 2 N

1.056 4 «o

1.060 4 N

1.081 6 N

1.110 8 N

1.143 4 M

1.147 10 N

1.164 6 M

1.193 8 M

1.230 10 M

1.238 6 L

1.267 8 L

1.304 4(1 L

1.333 8 K

1.371 40 K

1.429 ,oi

J= 23/2

0.960 2 Q

0.970 4 Q

0.988 6 Q

1.012 8 Q

1.043 2 0

10 Q

1.054 4 0

1.071 «0

1.096 8 0

1.127 >°0 1.130 4 N

1.148 «N

1.172 8 N

1.203 ,°N 1.217

1.242 8 M

1.273 ,°M

1.304 8 L

1.336 40 L

1.391 40K

J= 25/2

1.040 2 Q

1.049 4 Q

1.064 6 Q

1.084 8 Q

1.111 40 Q

1.120 4 0

1.135 «0

1.156 8 0

1.182 lOQ 1.200 «N

1.221 8 N

1.247 40 N

1.280 8 M

1.307 10 M

1.360 40 L

J = 27/2

1.111 4 Q

1.124 6 Q

1.142 8 Q

1.165 10 Q

1.185 6 0

1.203 8 0

1.226 40 O

1.259 8 N

1.282 40 N

1.333 ,°M

J = 29/2

1.172 6 Q

1.188 8 Q

1.208 10 Q

1.241 8 0

1.261 40 O

1.310 40 N

J = 31/2

1.226 8 Q

1.243 40 Q

1.290 10 0

/ = 33/2

1.273 10 Q
Table

7.

The

Periodic

System

26
LANTHANUM

La I

57 electrons Z=57

Ground state (ls 2 2s 2 2p6 3s 2 3p6 3d 10 4s 2 4p6 4d 10 5s2 5p6

) 5d6s 2 2 D3/2

Ionization energy 44981± 5 cm' 1 5.5770± 0.0006 eV

Identified even configurations 5d6s 2

, 5d2 6s, 5d

:\ 4/6s6p, 5d2 7s, 5d6s7s, 5d2 6d

Identified odd configurations 5d6s6p, 5d2 6p, 6s 2 6p, 4/5d6s, 4/6s2

, 4/5d2 ?, 5d2 7p?,

6s 2 8p-23p

Emission Spectrum, Energy Levels, g Values

Meggers’ [1932] list of wavelengths from arc and spark sources has about 700 lines assigned to La I (2647-10952 A). The basic analysis of the spectrum by Russell and Meggers

[1932] gave classifications for about 540 of these lines, and their list has not yet been

superseded by publication of the more recent observations. Fisher, Knopf, and Kinney [1959]

gave 14 La lines in the infrared region 1.11-1.41 p.m, with 10 lines classified by known La I levels.Stein [1967a, 1967b] was able to locate the 5

3 4 F term using modern computer techniques

to calculate several important configurations of both parities and to make energy-level

searches. The more comprehensive work on the analysis during the past 10 years is partly

based on new but as yet unpublished observations carried out at the Argonne National

Laboratory and at the Laboratoire Aime Cotton in Orsay [Giacchetti and Wilson, 1968, 1976; Ben Ahmed, Bauche-Arnoult, and Wyart, 1974; Ben Ahmed, Verges, Wilson, and Giacchetti,

1976; Ben Ahmed, 1976, 1977]. Giacchetti and Wilson photographed the spectrum emitted from

electrodeless lamps over the region 2500-9000 A, and Ben Ahmed and Verges obtained

Fourier-transform spectra of such lamps in the range 6900 A to 2.9 p.m. The list of stronger La

lines given by Meggers, Corliss, and Scribner [1975] for the region 2187-8840 A includes some

energy-level classifications of Lai lines by Giacchetti and Wilson, as well as classifications

from the earlier analysis of Russell and Meggers.

All levels given here except the 6s 2 8p-23p series members were reevaluated or newly

derived in the extensions of the analysis mentioned above. The level positions are from Ben

Ahmed et al. [1976a, 1976b], Ben Ahmed [1976, 1977], and Giacchetti and Wilson [1976]. The

combination arrays show the positions of the low even levels to be consistent to within a few

units in the third place [Giacchetti and Wilson, 1976],

Meggers’ measurements of optical Zeeman-effect patterns in La I and La II were largely

superseded by the more accurate determinations of Harrison, Rosen, and McNally [1945] at M.I.T. Zeeman data for 152 La I lines and 506 La n lines were given by Harrison et al., who

noted that their p-value determinations from different lines “agree usually to within 0.004 g

unit.” New measurements of Zeeman-effect patterns obtained at the Argonne Laboratory

enabled Ben Ahmed to determine many J values and extend the analysis. The two- and threeplace g values here are from these new data [Ben Ahmed et al., 1976a, 1976b; Ben Ahmed,

1976, 1977], or from Harrison et al. [1945], or are averages of values from these sources. Childs

and Goodman [1971] used the atomic-beam magnetic-resonance technique to obtain the five- place g values given for 13 low even levels. The stated uncertainties vary from 3 to 8 units in the fifth place except for the 4 P 1/2 level and the two 5d2 ('D)6s 2 D levels, for which the

uncertainties are 2 to 3 units in the fourth place.
28 La I —Continued

Theoretical Interpretation

Russell and Meggers identified the lowest even and odd levels as belonging respectively

to 5d6s 2

, 5d 2 6s and 5d6s6p, 6s 2 6p terms. A number of their level assignments to higher

configurations such as 5d2 7s and 5d2 6p have also been confirmed, but much of the present

interpretation was possible only with modern calculations and extension of the analysis. The

eigenvector percentages given here for the even levels are from the calculation of (5d6s 2 +

5d 2 6s+5d'f +4/6s6p+5d6s7s+5d2 7s) by Ben Ahmed et al. [1976a]; these six configurations

account for the known even levels up to about 33000 cm' 1

. Although configuration-interaction

and intermediate-coupling effects are apparent in the eigenvectors, the purities nevertheless

allow the grouping of most of these levels into Russell-Saunders terms. Ben Ahmed at al. [1976a] assigned six levels to two terms of the 5d2 6d configuration, which was not included in the calculation. With regard to the uninterpreted even levels above 33000 cm

-1 these authors

note that “Several overlapping configurations are expected to lie in this energy region, in particular 6p 2 5d, 5d2 6d, 5d6s6d and 6s 2 6d, not forgetting those levels above 35000 cm

-1 belonging to the configurations already studied. Because of this confusion of levels (made

worse by the large departures from LS coupling) we have not yet been able to classify the

great majority of these levels.” Stein’s [1967b] calculations for La I included the odd group (5d6s6p+6s 2 6p+5d2 6p+4/6s2 +

4/5d6s). He found several of the configuration interactions to be very large (see below), and

his eigenvector assignments correctly located the 4/6s 2 and 4/5d6s configurations and showed

the latter to be the main configuration for most of the levels previously assigned to 4/5d2

. Brewer [1971] also assigned or reassigned a number of the odd levels to 4/5d6s.

The percentages given here for the odd levels are from the thesis of Ben Ahmed [1977],

who has calculated the five configurations listed above in connection with her extension of the

analysis. We list the percentage for the largest single eigenvector component first, as usual. This number is, however, followed by the largest total percentage contribution to the

eigenvector from a configuration different from that for the first percentage; if no such

percentage from another configuration is 5=10%, the second percentage space is blank. The

large configuration mixing is apparent, and in some cases the second listed configuration is the

largest total contributor to the eigenvector. Ben Ahmed regards the calculation as preliminary;

a calculation including additional configurations is needed, since large deviations occur for some levels in the region above about 23000 cm 1

. The inclusion of additional configurations,

particularly 4/5d2

, will of course change some of the eigenvectors significantly. Ten of the

eleven unidentified levels between 29466 and 33820 cm

-1 can be assigned to doublet terms of

the 4/5d( :i G°)6s subconfiguration; however, these levels and the 5d2

(

:i P)6p 4 S3/2 level were

omitted from the calculation because of large deviations [Ben Ahmed, 1977], The tentative

assignments of several odd levels above 34000 cm -1 to 4/5d2

, 5d2 7p, and 5d6s7p terms are also due to Ben Ahmed. The 4/5d2 configuration probably accounts for many of the unidentified

levels in this region.

5d6s 2 2 1) 6s

2 np 2 P° Absorption Series and the Ionization Energy

Garton and Wilson [1966] observed two series interpreted as 5d6s 2 2 D5/2 —

6

s

2 np 2 P°/2 and

5d6s- 2 D :i/2 —6s

2 np 2 P°/23/2 , respectively (w=8-23). The lines are broadened by autoionization for

9, and none of the (theoretical) doublets of the latter series were resolved. In some cases we have given the positions for the 6s

2 np 2 P°/2 levels as derived from the former series

separately from the corresponding np 2 P° positions from the latter series, but the differences

may not be significant. Garton and Wilson derived the quoted value for the La II 6s 2 1 S0 limit from these series, and thus also the 5d

2 :! F2 principal ionization energy.

References

Ben Ahmed, Z., unpublished material (1976). EL ZE PT

Ben Ahmed, Z., Thesis, Univ. Paris. Orsay (1977). EL CL ZE PT

Ben Ahmed, Z., Bauehe-Arnoult, C., and Wyart, J. F., Physica (Utrecht) 77, 148 (1974). EL ZE Hfs PT

Ben Ahmed, Z., Verges, J., Wilson, M., and Giacchetti, A., Physica (Utrecht) 84C, 275 (1976a). EL ND ZE PT

Ben Ahmed, Z., Verges, J., Wilson, M., and Giacchetti, A., unpublished material (1976b). EL ZE

Brewer, L., J. Opt. Soc. Am. 61, 1101 (1971). ND
La I —Continued 29

Childs, W. J., and Goodman, L. S., Phys. Rev. A 3, 25 (1971). ZE Hfs PT

Fischer, W., Hiihnermann, H., and Mandrek, K., Z. Phys. 269, 245 (1974). IS

Fisher, R. A., Knopf, Jr., W. C., and Kinney, F. E., Astrophys. J. 130, 683 (1959). CL W

Garton, W. R. S., and Wilson, M., Astrophys. J. 145, 333 (1966). EL CL W IP

Giacchetti, A., and Wilson, M., J. Opt. Soc. Am. 58, 740A (1968). Giacchetti, A., and Wilson, M., unpublished material (1976). EL CL Hfs

Harrison, G. R., Rosen, N., and McNally, Jr., J. R., J. Opt. Soc. Am. 35, 658 (1945). ZE

King, A. S., and Carter, E., Astrophys. J. 65, 86 (1927). W

Meggers, W. F., J. Washington Acad. Sci. 17, 25 (1927). EL

Meggers, W. F., J. Res. Nat. Bur. Stand. (U.S.) 9, 239 (1932). W ZE

Meggers, W. F., and Burns, K., J. Opt. Soc. Am. 14, 449 (1927). EL Hfs

Meggers, W. F., Corliss, C. H., and Scribner, B. F., Nat. Bur. Stand. (U.S.), Monogr. 145, Part 1, 403 pp. (1975). CL

Moore, C. E., Atomic Energy Levels, Nat. Bur. Stand. Ref. Data Ser, Nat. Bur. Stand. (U.S.), 35, Vol. Ill, 282 pp.

(1971). Compilation EL ZE IP

Russell, H. N., and Meggers, W. F., J. Res. Nat. Bur. Stand. (U.S.) 9, 625 (1932). EL CL ZE IP

Stein, J., J. Opt. Soc. Am. 57, 333 (1967a). EL ND CL PT

Stein, J., Thesis, Hebrew Univ. Jerusalem, Israel, 152 pp. (1967b). EL ND CL PT

Wilson, M., Phys. Rev. A 3, 45 (1971). AT

[May 1977]

La I, Even Parity

Configuration Term J

Level (cm -1

) 9 Leading percentages

5rf 6s2 2D 3

/0.000 0.79755 85 10 5d2

(

1 D)6s 2D

5

/2 1053.164 1.19907 82 13

5rf2

( 3 F)6s 4p 3

/2 2668.188 0.40446 98 1 5c/6s2 2D

5

/2 3010.002 1.02940 98 1 5d 6s2 2 D

7

/3494.526 1.23742 99 1 ( 3F) 2 F

9

/4121.572 1.33278 100

5d2

( 3 F)6s 2F 5

/

7011.909 0.89830 86 5 CD) 2D

7

/2 8052.162 1.13469 93 4 5d

3 2F

5t/2

( 3P)6s 4p V2 7231.407 2.65252 99 1 PS) 2S

3

/2 7490.521 1.70427 97 2 CD) 2D

5

/2 7679.939 1.50558 82 10 CD) 2D

5d2(»D)6s 2D 3

/

8446.044 0.93603 61 18 ( 3P) 2P

5

/9183.797 1.25449 67 16 ( 3P) 4P

W2

( 3P)6s 2P V2 9044.214 0.690 72 26 5d

3 2P

3

/2 9719.439 1.220 54 21 5d2

(

l G)6s 2G 9

/9919.821 1.107 91 8 5d

3 2G

7

/

9960.904 0.892 88 9

5d

3 4 F 3

/2 12430.609 0.411 98 1 2D2

5/2 12787.404 1.026 99

7/2 13238.323 1.228 99

9

/2 13747.276 97 2

2G

5d

3 4p V2 16617.30 97 2 5t/2

(

l S)6.s 2S

3

/16735.14 1.698 94 2 5d2

( 3P)6s 2P

5

/2 17099.38 97 2

2D1

5d2

(

1 S)6s 2S

lh 16991.42 97 2 5d

3 4P

5d

3 2G 7

/17023.36 0.880 90 9 5dVG)6s 2G 9

/17140.90 54 39 2 H

5d3 2 D2 3

/2 18037.64 57 26 2D1

5/2 18776.62 68 21
30

La I, Even Parity—Continued

Configuration Term J

Level (cm' 1 ) 9 Leading percentages

5d

3 2H 11

/2 18310.92 100

9

/2 18315.88 0.970 61 36 2G

5d3 2P Va 20392.60 0.709 71 26 5d2

( 3P)6s 2P

3

/2 21037.30 1.316 67 24

5

d

3 2F 7

/2 21943.80 95 4 5d2

( 3F)6s 2F

5/2 21969.32 93 3

5d3 2D1 5

/2 25414.63 64 23 2D2

3

/2 56 32

4/6s(3F°)6p 4p 3

/

2

28742.34 0.45 96 2 ( 3F°) 2D

5

/2 28754.96 0.93 64 15 (iF°) 2F . 7/2 30055.05 1.19 54 15 (

1 F°) 2F

9

/2 91 3 ( 3F°) 2G

4/6s(3F°)6p 7

/2 29045.86 1.15 40 4p 33 (iF0

) 2p

4/6s(3F°)6p 4G S

/2 29578.82 0.78 62 23 ( 3F°) 4F

7

/

2

30401.70 1.03 77 15 (iF0

) 2F

9

/

2

30934.76 1.16 78 18 (iF0

) 2Q

11

1

2

100

5d2

(3F)7s 3

/

2

29874.97 0.70 42 4p 30 5rf6s(3D)7s 4D

5d2

( 3F)7s 5/2 29905.33 1.14 20 4p 20 5d6s(!D)7s 2D

5d6s( 3D)7s 4 D 30019.24 0.00 100

3

/

2

30169.82 0.91 58 39 5d2

( 3F)7s 4F

5

/2 30354.28 1.07 44 30 5d2

( 3 F)7s 4F

7

/

2

31287.59 1.41 85 7 ( 3F°) 4 D

4f6s( l F°)6p 2F 5

/2 30305.61 0.84 49 25 ( 3F°) 4G

4/fo(3F°)6p 4 D 5

/2 30908.86 1.25 58 23 (iF°) 2 d

3

/2 30988.36 1.12 85 7 (ip0

) 2D

1

/ 2 31061.85 0.00 100

?/2 31925.00 1.27 63 14 (1F°) 2Q

5d2

( 3 F)7s 4p 7

/2 31059.69 1.22 83 17 ( 3F) 2F

5d2

( 3F)7s 5

/2 31119.02 0.98 48 4p 46 (3F) 2F

5d6s( 1 D)7s 3

/

2

31247.78 0.78 33 2D 30 5d2

(

1 D)7s 2D

5d6s(3 D)7s 5

/2 31351.60 1.18 34 4D 21 (

1D) 2D

5d6s( 3D)7s 2D 3

/

2

31688.66 0.81 78 9 5d3 2 D1

5

/2 32872.94 1.19 74 10 5d2

(

1 D)7s 2 D

5d2

( 3 F)7s 4p 9

/

2

31923.96 1.34 99 1 (!G) 2G

5d2

( 3F)7s 2F 72 32108.48 1.13 82 17 ( 3F) 4F

4/6s( 1 F°)6p? 2G? 72 32219.53 1.06 46 19 ( 3F°) 4 D

72 50 22 ( 3F°) 2G

4/6s( 1 F°)6p 72 32348.34 1.23 44 2D 36 ( 3F°) 4 D

72 33143.55 1.39

5cP(3 F)6d 4H 72 33286.50 0.78 72 33753.41 1.02

11/2

13

/2
31

La I, Even Parity—Continued La I, Even Parity—Continued

Configuration Term J

Level (cm -1

) 9 Configuration Term

5d

2

( 3 F) 6o? 4G

S

/2 33350.00 0.68 72 33756.45 0.99 72 34526.69 n/2 35236.20 1.21

72 33419.48 1.03 72 33657.05 1.17

72 33678.21 0.99

72 34032.72 0.90

72 34124.64 0.89

72 34249.24 0.97

72 34272.48 0.84 72 34369.05 1.62

72 34400.06 1.21

72 34482.28 1.21

72 34488.22 1.75 72 34529.88 0.88

72 34545.80 0.83

72 34590.09 1.32

72 34634.98 1.07

72 34663.99 1.10

72 34752.58 1.33 72 34758.54 1.28 72 34787.23 1.01 72 34860.96 0.95 72 34880.63 0.91 72 34906.89 1.07 72 34968.73 1.05 72 35009.99 1.22 72 35096.10 1.20 72 35117.70 1.20 72 35169.58 0.95 72 35280.42 0.94 72 35298.12 1.09 72 35308.40 1.04 72 35393.38 1.28 72 35414.45 1.10 72 35445.98 1.11 72 35494.05 0.83 72 35552.32 1.15 72 35570.48 1.11 72 35581.78 1.80 72 35628.33 1.13 La II ( 3F2 ) Limit

J

Level (cm -1

) 9

72 35875.99 1.78 72 35907.05 1.19 72 35931.75 1.28 72 36027.41 2.17 72 36034.60 1.10 72 36065.91 0.96 72 36109.65 1.28 n/2 36159.90 1.28 72 36172.80 1.24 72 36220.33 1.13 72 36258.93 1.40 72 36265.28 1.22 72 36292.96 1.23 72 36400.72 1.18 72 36792.36 0.89 72 36822.77 0.90 72 36840.70 2.02 72 36851.32 1.21 72 36853.58 1.13 72 37092.15 0.66 72 37248.61 1.38 72 37544.15 1.06 72 37612.91 1.43 72 37659.48 0.91

72 37833.78 0.90 72 37855.75 1.28 72 37903.24 0.93 72 38172.80 0.93 72 38178.00 0.99 72 38378.90 1.06 72 38391.75 1.04 72 38478.84 0.90 72 38755.72 72 38921.15 0.22 72 38991.90 1.03 72 39110.34 0.87 72 39391.23 1.04 72 40084.07 1.25 72 40243.01 2.24

L 44981
32

La I, Odd Parity

Configuration Term J

Level (cm~ l ) 9 Leading percentages

5d6s( 3D)6p 4p° 3

/2 13260.38 0.52 71

5

/2 Li80.lf.08 1.09 53 10 5

d

2 6p

7

/

2

15019.51 1.237 89

9

/

2

16243.17 97

5d6s( 3D)6p 5

/2 13631.04 1.096 43 4F° 10 5d2 6p

5d6s(3D)6p 4 D° 1 h 14095.69 0.357 49 26 6s2

(

1 S)6p 2P°

3

/

2

14708.92 1.01 57

5

/2 15503.64 1.36 86

7

/

2

1609939 1.37 81

5d6s(3D)6p 3

/2 15031.64 0.92 25 2D° 11 5tf2 6p

4/(is2 2 F° 5

/2 15196.83 0.906 53 31 5rf6s6p

7

/

2

16538.39 1.179 51 29

5d6s(3D)6p V2 15219.89 0.313 46 4 D° 35 6s2

(

1 S)6p 2P°

6s2CS)6p 3

/

2

1628036 1.326 40 2p° 51 5c/6.s6p

5d2

( 3 F)6p 5

/2 16856.80 0.810 28 4G° 24 4/6s2 2F°

5d6s(3 D)6p 4 P° V2 17567.49 2.63 93

3

/

2

1779739 1.69 82

5/2 18156.97 1.175 51 31 5d2 6p

5c/2

( 3F)6p 7

/

2

17910.17 1.086 42 4G° 19 4/6s2 2F°

5rf2

( 3 F)6p 4G° 5

/2 17947.13 1.061 42 46 5c/6s6p

7

/

2

18603.92 1.051 52 23 5c/6.s6p

9

/2 19129.31 1.173 96

11

1

2

20117.38 1290 96

5d2

( 3 F)6p 2D° 3

/

2

18172.35 0.799 60 29 5d6s6p

5

/2 19379.40 1.186 54 30

5<f6s( 1 D)6p 3/2 20018.99 1.01 37 2p° 51 5

d

2 6p

5d2

( 3 F)6p 4p° 3

/

2

20082.98 0.724 72 11 5rf6s6p

5/2 2033835 1.006 73

7/2 2076331 1.178 63

9

/

2

21384.00 1.278 67

5rf6s( 1 D)6p V2 20197.34 0.63 47 2p° 50 5d2 6p

5d2

( 3F)6p S/2 20972.17 0.890 41 2p° 28 5d6s6p

5d2

( 3 F)6p 7

/

2

21447.86 1.103 31 2p° 16 5d6s6p

5tf2

( 3F)6p 2G° 7

/

2

21662.51 0.995 51 15 4/5d6s

9

/

2

22285.77 1.13 44 32

5tf2

( 3F)6p 4 D° V2 22246.64 0.04 89

3/2 22439.36 1.192 92

5/2 2280435 1.362 92

7/2 2330336 1.178 80

M6s(3D)6p 7

/

2

23221.10 1.078 23 2F

° 47 4/5rf6.s

5rf2

( 3P)6p 2S° V2 23260.92 1.891 85

4/5d( 1 G°)6s 2G° 9

/2 23466.84 1.11 49 31 5d2 6p
33

La I, Odd Parity—Continued

Configuration Term J

Level (cm" 1 ) 9 Leading percentages

5c?2

( 3P)6p 4D° V2 23528.4-5 0.153 85

3/2 23704.81 1.133 79

S

/2 24046.10 1.271 63 16 4/5d6s

7

/2 25083.36 1.381 83 12 4f5d6s

5c?6s( 3D)6p S

/2 23874.95 0.962 34 2p° 32 4/5d6s

4/5c?(3H°)6s 4H° 7/2 24088.54 0.72 73 14 5tf2 6p

9

/

24249.00 0.96 65 12 5d

2 6p U/2 24841-42 1.15 86

l 3

/

100

4/5c?(3F°)6s 4p° 3

/2 24173.83 0.717 68 13 5d2 6p

5/2 24507.87* 1.158 48 21

7

/

2538027 1.228 84 10

9

/

25997.17 1.319 85 11

4/5c?( 1 G°)6s 7/2 24409.68 1.161 40 2G° 29 5d2 6p

5c?2

( 3P)6p 4S° 3

/

2463926 1.781 59 14 5d6s6p

5c?2

( 3P)6p? 2D°? 3

/

24762.60 0.854 49 26 5d6s6p

4/5c?( 1 D°)6s? 3

/

24910.38 0.724 22 2D° 44 5d2 6p

5c?2

( 3P)6p? 5

/2 2498429 1.063 31 2D° 49 4/.M6.S

4/5c?(3H°)6s 9

/

25089.35 0.94 42 2H° 33 5d2 6p

5c?2

( 3P)6p 5

/

2521827 1.244 21 4p° 26 4/5c/6s

5c?6s( 3D)6p V2 25453.95 0.984 31 2p° 35 5c?2 6p

5d2

( 3P)6p 4p° V2 25616.95 2.274 62 13 5d6s6p

3

/

25643.00 1.59 65 13 4/5c?6s

5

/2 26338.93 1.524 60 18 4/5c/6.s

5d2

(

1 G)6p 11

1

25874.52 1.082 47 2H° 52 4/5c/6s

5d2

( 3P)6p 3

/

25950.32 1.433 33 4S° 19 4/5c/6.s

4/5rf(3G°)6s 4G° S/2 27022.62 0.58 78-

7

/

27455.31 0.976 86 11 5c?2 6p

9

/

28089.17 1.163 95

11

12874324 1.27 96

5d2CG)6p 9

/

27054.96 0.91 49 2H° 49 4/5c?6s

5c?2

(

x G)6p 2G° 7

/27132.44 0.94 48 38 4/5c?6s

9

/

27619.54 1.12 62 30

5c?2

( 3P)6p 2p° 3

/

2722526 1.31 50 13 4/5c?6s V2 27748.97 0.682 48 19

5rf2

(

1 D)6p 5/2 27393.04 0.888 32 2F° 31 5c?6s6p

4/5c?(3 F°)6s 2p° S/2 27669.37 0.88 57 31 5c?2 6p

7

/

28543.08 1.12 57 36

4/5d(3D°)6s 3

/

27968.54 0.836 33 2D° 32 5c?2 6p

5c?6s( 1 D)6p 7

/

28039.45 1.14 31 2p° 45 5c?2 6p

4/5c?(3H°)6s 2 H° 11/2 28179.07 1.098 57 39 5c?2 6p

5d6s(3D)6p 5

/2 28506.41 1.20 21 2D° 45 5c?2 6p

4/5c?(3D°)6s 4D° I V2 1 28893.51 0.018 84 11 5c?2 6p
34

La I, Odd Parity—Continued

Configuration Term J Level (cm *) 9 Leading percentages

4/5d(3D°)6s 3

/2 28971.84 0.884 46 4D° 22 5d2 6p

4/5d(3D°)6s 3

/ 2 29199.57 1.106 36 4D° 20 5cP 6p

7

/ 2 29466.67 0.93

4/5rf(3D°)6s 5

/2 29502.18* 1.263 41 4D° 19 5rf2 6p

4/5d(3P°)6s V2 29564.70 0.78 35 2p

° 19 5d2 6p

4/5d(3D°)6s 5/2 29775.58* 1.253 36 4D° 20 5d2 6p

4/5d(3D°)6s 7/2 29894.91 1.352 34 4D° 21 5d2 6p

4/5d(3P°)6s 3/2 29936.74* 1.492 44 2p

° 14 5d6s6p

4/5d(3P°)6s 4p

° V2 29985.46 2.534 50 17 5d2 6p

3

/ 2 30417.46* 1.533 49 15

S

/2 30896.84 1.424 67 17

9

/ 2 3065028 1.08

5/2 30788.45 1.04

7/2 30964.71 1.15

5

/2 3147722 0.90

3

/2 31751.48 0.832

7

/2 32140.55 1.15

4/5d( 1 P°)6s 2p

° V2 32290.16 0.67 72 13 5d2 6p

3

/2 69 16

9

/ 2 32415.73 0.92

S

/2 32492.76 1.145

3

/2 33204-05 1.324

5

/2 3379923 1.25 V2 33820.31 0.617

5d2

( 3F)7p? 4 p

°? 3

/ 2 34015.76 0.60

S

/2 34213.53

7

/ 2 34988.1 7?

9

/

2

35888.45

4/5d( 1 H°)6s 2H° 9/2 34239.61 0.90 89

Xl

/2 34245.05 1.06 89 10 5d2 6p

3

/2 34299.11 1.01

5tf2

( 3F)7p? 4G°? 5/2 34358.60

7

/ 2 34380.86

9

/ 2 35236.06 1.13

11

1

2

36074.74

4/( 2F°)5rf2

( 3 F)? 4 H°? 9

/2 34714.73 1.02

5d6s( 3D)7p? 4F°? 3

/2 34850.38 0.58

5

/2 34982.43 0.9

S

/2 35232.81

4/( 2F°)5rf2

( 3F)? 2G°? 7

/ 2 35253.10 0.89

9

/ 2 35450.47 1.09

5/2 35275.16 1.2

3

/2 35470.85 1.42

1 /2 35482.70
35

La I, Odd Parity—Continued La I, Odd Parity—Continued

Configuration Term J

Level (cm -1

) g Configuration Term J

Level (cm -1

) g

72 35780.10

2p° 72 47675

V2 35860.64 2.2 47695

7

/2 35956.72 WSHOp 2P° 49168.7 72 49176.5

7

/35999.06 1.03

5/2? 36081.09 esvsnip 2p° 500262

72 50030.3

3/2 36333.08 1.57 V2 36358.96 0.40 esvs^p 2P° 72 50591.4 50593.5

5

/2 36447.35 0.90 6s2os)i3p 72 50968.3

7

/

36454-46 50969.6 V2 3649528 0.43 6s2('S)14p 51238.7

3

/2 36678.58 0.91 72 512422

3

/2 36722.38 1.076 es^susp 2P° 51432.2

772 3672327 1.21 72 51441.6 V2 36896.63 1.70 6s2

(

1 S)16p 2p° V2,72 515912

S/2 37086.70 1.20

5

/2 37245.34 0.98 GsVSWp 2p° 72 51708.5 517102

3

/

37253.52 1.20 V2 37475.30 0.76 QsVS)l8p 2p° 72 51800.3

51801.5

7

/

37673.94 1.29

5

/ 37731.59 1.15 6s2

(

1 S)19p 2p° 72,72 51874.1

5

/ 2 37771.53 0.733 6s2

(

1 S)20p 2p° 72,72 519392

3

/ 2 37787.04 0.648 6s2

( 1 S)21p 2P° 72,72 51989.0

7

/ 2 37842.77 1.0

5/2 37961.34 1.14 6s2(*S)22p 2p° 72,72 52030.4

7

/ 2 37982.68 1.04 6s2

( 1 S)23p 2P° 52066.7

7

/2 38050.57 1.04 72 52069.8

3/2 38061.57 1.33 La 11 (!&.) Limit 52376

5

/

38264.31 0.79

S/2 39179.11 1.04

7

/ 2 39350.50 72 40910.11 1.15

6s

2

(

1 S)8p

2P° 72 44978.6 72 44978.9?

La II ( 3 F2 ) Limit 44981
36

La II

(Ba I sequence; 56 electrons) Z=57

Ground state (ls 2 2s 2 2p6 3s 2 3pfi 3d'°4s 2 4p6 4d!

10 5s 2 5p6

) 5

d

2 3 F2

Ionization energy 89200± 80 cm -1

Identified even configurations

Identified odd configurations

11.060± 0.010 eV

5d

2

, 5d6s, 6s2

, 4/6p, 4f

2

, 6

p

2

, 5d6d, 5d7s,

6s7s?, 6s6d

4/6s, 4/5d, 5d6p, 6s6p

Spectrum Observations, Zeeman Effect, Early Work on the Analysis

Meggers [1927] and Russell and Meggers [1932] carried out most of the analysis of this spectrum, greatly extending the earlier work of Paulson [1914] and Goudsmit [1925]. Most of

the energy levels and assignments are from the 1932 paper, which pointed out that

observations of La II in the Schumann region were needed for extension of the analysis. No

such observations appear to have been made to date. Meggers [1932] lists about 800 lines for

La II in the range 2142-10955 A, with more than 700 having energy-level classifications

[Russell and Meggers].

All except one of the g values are from Harrison, Rosen, and McNally [1945]. (See La I for more detail on the Zeeman data.) These authors also give more accurate (3-place) wavelengths

for some of the 507 La ii lines for which they obtained Zeeman patterns.

La ii was an important spectrum in early applications of the Slater-Condon theory of

atomic structure. The identification of the complete 4/6p, 4/5d, and 4/ 2 configurations in La ii led Condon and Shortley [1931] to extend Slater’s formulas to configurations involving /

electrons. They showed that the La ii 4/5d and 4/ 2 configurations fit the theory very well, and

“their theoretical predictions led to the correct identifications of the difficult terms 4/5d 1 H°

and 4f

2 'I” [Russell and Meggers], The agreement with theory for several other two-electron

configurations in La n was less good because of neglect of strong configuration interactions

and of the spin-orbit interaction.

Designations and Calculations of the Even Levels

More recent calculations have yielded quantitative details of the configuration interactions

in both the even and odd groups. In a discussion of the (5d2 +5d6s+6s2

) group, Goldschmidt

[1968b] notes the especially mixed configurational compositions of the J-2 levels at 1394 and

10095 cm 1

. The 'D character of both levels is apparent from the eigenvectors, but “the

assignments of configurational quantum numbers . . . are meaningless.” We indicate the lack of

configuration assignments by listing the “a 1 D” and “5 ’D” designations of these levels after

the respective leading percentages, instead of under “Term.” Russell-Saunders term notations

preceded by small letters are in all cases as given by Russell and Meggers, and can be used in connection with line classifications given in their paper.

All eigenvector percentages for the even levels are from Goldschmidt’s [1976] calculation

of the group ( 5d2+5d6s+6s2+4f'Li-4f6p+6p 2+6s6d). Her eigenvector assignments reverse the former

configuration designations of the high h 'D 2 and i ‘D2 levels, a result not inconsistent with the

intensities of the transitions from these levels. The 4/6p levels are here arranged into four

j\ j2 'coupling terms according to the leading percentages, the Russell-Saunders designations

being listed after the word “or” in the last column. The four 5d7s levels clearly form two jx j2 pairs, as listed, and again the less appropriate Russell-Saunders names are also shown.

The reality of the 5d6d :! P0 level is questionable [Russell and Meggers], and the

designations of the nominal hd6d 3 S,, 'So, and 3 Pj levels are given here as tentative. The

inclusion of this configuration in the calculation of the even group is definitely needed. The

/

:, S, level given by Harrison et al. (60660.18 cm -1

) classifies several lines listed by Russell and
La II —Continued

Meggers, and is certainly real. The position is consistent with our suggested assignment to the

6s7s configuration. The “i 3 D:) ” level of Russell and Meggers (69233.90 cm

-1

) is still uninterpreted, and the tentative level at 64706.76 cm 1 is omitted here.

Interpretation of the Odd Levels

Goldschmidt [1968a; 1974] and Spector and Gotthelf [1970] have calculated the four

identified odd configurations (4/6s+4/5d+5d6p+6s6p), with the configuration interactions

included. The eigenvector percentages here are from Goldschmidt’s unpublished results [1974].

The 4/6s levels are grouped into two j x j2

-c0UP^ng pairs, with the Russell-Saunders names and

leading percentages being given after the word “or” in the last column.

The designations y

:! P 2 and x:, P 2 are retained for the levels at 29498 and 33204 cm -1

, respectively, because the eigenvectors have high :! P° character; these designations are given

after the leading percentages (and not under “Term”), however, to indicate that meaningful

configuration assignments are prevented by the strong mixtures of 6s6p and 5d6p in the

eigenvectors. Several J=1 levels in this group also have very mixed compositions. The eight

odd levels lying above the interpreted group are listed with the ordinal designations used by

Russell and Meggers.

Ionization Energy

Sugar and Reader [1965] related the 4/6s levels, the 5d6s and 5d7s levels, and the 5d6s

and 6s6d levels to known regularities for the three corresponding series, 4/ns, 5dns, and 6snd.

The three values thus obtained for the ionization energy agreed to within 52 cm” 1

. We give

their value with an error estimate conservatively based on this agreement.

References

Condon, E. U., and Shortley, G. H., Phys. Rev. 37, 1025 (1931). PT

Eremin, M. V., and Maryakhina, O. I., Opt. Speetrosc. (USSR) 26, 479 (1969). PT

Goldschmidt, Z. B., Thesis, Hebrew Univ. Jerusalem, Israel, 487 pp. (1968a). PT

Goldschmidt, Z. B., in Spectroscopic and Group Theoretical Methods in Physics, Ed. F. Block et al. (John Wiley and

Sons, New York, N.Y., 1968b). PT

Goldschmidt, Z. B., unpublished material (1974; 1976). ND PT

Goudsmit, S., Proc. Sect. Sci. Kon. Akad. Wet., Amsterdam, 28, 23 (1925). EL CL ZE

Harrison, G. R., Rosen, N., and McNally, Jr., J. R„ J. Opt. Soc. Am. 35, 658 (1945). CL ZE

Meggers, W. F., J. Opt. Soc. Am. 14, 191 (1927). EL CL W

Meggers, W. F., J. Res. Nat. Bur. Stand. (U.S.) 9, 239 (1932). W ZE

Meggers, W. F., and Burns, K., J. Opt. Soc. Am. 14, 449 (1927). Hfs

Paulson, E., Ann. Phys. (Leipzig) 45, 1203 (1914). EL W

Russell, H. N., and Meggers, W. F., J. Res. Nat. Bur. Stand. (U.S.) 9, 625 (1932). EL ND CL W ZE IP

Spector, N., and Gotthelf, U., Opt. Pura Apt (Spain) 3, 98 (1970). ND PT

Sugar, J., and Reader, J., J. Opt. Soc. Am. 55, 1286 (1965). IP

[January 1977]
38

La II

Configuration Term

J

Level (cm -1 ) 9 Leading percentages 5d2 a 3F 2 0.00 0.721 83 li i 3 1016.10 1.083 100 4 1970.70 1.248 99 l !G 5c?2 2 1394.46 0.977 36 a *D 33 5d6s ‘D

5d6s

a 3 D 1 1895.15 0.498 100 2 2591.60 1.133 85 10 5c?2 'D 3 3250.35 1.334 100 5c?2 a 3P 0 5249.70 92 4 1 5718.12 1.497 99 1 4f2 3p 2 6227.42 1.481 96 3 5c?6s 'D 6s2 a *S 0 7394.57 75 17 5c?2 !S 5c?2 a *G 4 7473.32 1.000 98 1 5c?2 3F

5d6s 2 10094.86 1.005 53

b »D 42 5d2 4f( 2 FS/2)6si/2 ( 5/2,V2)° 2 UU7.98 0.664 96 or 95 z 3F° 3 17,375.17 1.056 95 or 64

4/( 2 F7/2)6Sl/2 ( 7/ 2 ,V2)° 4 15698.71, 1.247 95 or 97 z 3F° 3 15773.77 1.017 93 or 64 z 1 F°

4/5d 2 *G° 4 16599.17 0.969 73 22 3H°

4/5c?

y 3 F° 2 17211.93 0.754 70 26 i D° 3 18235.56 1.086 97 4 19214.54 1.232 90 8 1G°

4/5c? 2 3 H° 4 17825.62 0.846 77 19 1 G° 5 18580.41 1.017 100 6 19749.62 1.178 100

4/5rf

ao 2 18895.41 0.923 64 28 3p°

4/5c? 2 3G° 3 20402.82 0.757 96 4 21331.60 1.049 100 5 22282.90 1.197 99

4/5c? 2 3D° 1 21441-73 0.542 79 15 5c?6p 3D° 2 22106.02 1.167 83 13 5c?6p 3D° 3 22537.30 1288 78 10 4/5c? J F°

4/5c? 2 3P° 0 22683.70 84 11 5c?6p 3P° 1 22705.15 1.431 79 11 2 23246.93 1.459 82 11

5c/6p 6o 2 24462.66 0.887 56 33 3p°

4/5c? 2/^° 3 24522.70 1.034 84 10 3D°

5d6p 2/ 3D° 1 25973.37 0.782 44 27 ip° 2 27388.11 1.168 83 13 4^5^ 3 D° 3 2831525 1.308 81 10 4/5c? 3 D°

5d6p

x 3F° 2 26414-01 0.825 59 33 iD° 3 26837.66 1.088 90 . 4 28565.40 1.245 95

5d6p 1 27423.91 0.876 37 3D° 23 ip°

6s6p 2/ 3P° 0 27545.85 70 19 5d6p 3P°

6s6p 1 28154.55 1.267 44 3p° 30 4/ 5c? 'P0
39

La II—Continued

Configuration Term J

Level (cm -1

) 9 Leading percentages

4/5d 2 ‘H 0 5 28525.71 1.004 99

6s6p 2 291,98.05 1.471 45 2/ 3P° 40 M6p 3P° 4fM y

1 P° 1 3035333 1.074 49 22 M6p !P° M&p X

3P° 0 31785.82 70 26 6s6p 3P°

1 32160.99 1.492 65 29 M6p X

1 F° 3 32201.05 1.005 91

6s6p 2 33201,41 1.494 52 x

3P° 45 MGp 3P°

4

( 2FS/2)6pi/2

(5/2,V2) 3 35452.66 0.876 92 or e

aG

2 35787.53 0.719 80 or e

3F

4/( 2F7/2)6P l/2

( 7/2,V2) 3 36954.65 1.061 48 or e

3F

4 37172.79 1.127 86 or e

3G

4f(2F5/2)6p3/2

( 5

/2,3

/2) 3 37209.71 0.944 48 or e

J F

4 37790.57 1.113 82 or e

3F

2 38221.49 1.071 81 or e

3D

1 38534.11 0.497 100 or e

3D

4

( 2 F7/2)6p3/2

( 7

/2,3

/2) 5 39018.74 1.21 100 or e

3G

4 39221.65 1.059 70 or e

7 G

3 39402.55 1.274 80 or e

3D

2 40457.71 1.036 97 or e

X D

6s6p X 1P° 1 45692.17 0.999 77 20 MGp 1 P°

5d( 2D3/2)7S!/2

(3/2,V2) 1 49733.13 0.500 or /

3D

2 49884.35 1.117 or /

3D

5rf( 2Ds/2)7Sl/2

( 5

/2,

1 /2) 3 51228.57 1.315 or /

3D

2 51523.86 1.036 or /

X D

MM /

J F 3 52137.67 0.987 MM p

3 D 1 52169.66 0.621 2 52734.81 1.154 3 53689.56 1.218 MM /

3G 3 52857.88 0.861 4 53333.37 1.036 5 54434.65 121

MM 1 53302.56 1.335 MM /

3F 2 53885.24 0.751 3 54840.04 1.088 4 55321.35 1.136 MM e

3S? 1 54365.80 1.455 MM? e

J S? 0 54793.82 MM e

3P 0 54964.19?

1 55230.33* 1.552 2 56036.60 1.203

4P e

3 H 4 55107.25 0.883 98 2 !G

5 55982.09 1.033 100 6 56837.94 1.14 100 MM p iD 2 55184.05 1.183 MM /‘G 4 56035.70 1.027
40

La II

Continued

Configuration Term J

Level (cm' 1 ) 9 Leading percentages

1

° 3 57364.12 1.07

4f2 9

3 F 2 57399.58 0.675 97 2 3 57918.50 1.085 100 4 58259.41 1.196 77 22 *G

2

° 4 58748.90

4/

2 9 'G 4 59527.60 1.046 75 23 3F

3° 2,3 59612.64

6p

2 A >D 2 59900.08 1.035 58 32 6s6rf 'D

6p2 /

3 p 0 60094.84 90 6 *S

1 61128.83 1.528 95 5 4f

2 3P

2 62506.36 1.416 79 11 if2 »D

6s7s? /

3 S 1 60660.18 1.955

4° 4 60744-17 1.25

5° 3,4 61017.66

6

° 3,4 61514.46 0.97?

4/2

i »D 2 62026.27 1.054 78 12 3P

4/2 e O 6 62408.40 1.003 100

4/2 9

3 P 0 63463.95 91 4 >S

1 63703.18 1.471 94 5 6p

2 3P

2 64278.92 1.414 82 9 6p2 3P

7° 4 63598.87 1.205

6s6d /? 3 D 1 64361.28 0.506 100 2 64529.90 1.217 99 3 64692.59 100

8° 3 64411-17 0.97

6p2 .PS 0 66591.91 56 35 4/

2 !S

? 3 D? 3 69233.90

4/2 9 *S 0 69505.06 58 34 6p2 is

La in ( 2D3/2) Limit 89200
41

La III

(Cs i sequence; 55 electrons) Z=57

Ground state (ls 2 2s2 2p6 3s 2 3p6 3d 10 4s 2 4p6 4d 10 5s2 5p6

) 5d

2 D:!/2

Ionization energy 154675± 5 cm 1 19. 1774± 0.0006 eV

Identified even configurations 5p6 5c?-9d, 5p6 6s-10s, 5p6 5g-8g

Identified odd configurations 5p 6 4/-8/, 5p6 6p-9p

Gibbs and White first classified the La ill 6s-6p and 5c?-6p multiplets in their early work

on one-electron spectra. Badami confirmed these terms in his 1931 paper and added the 6c? levels. The following year Meggers published new measurements of the La spectra, and

Russell and Meggers gave new values for the known La m levels, as well as for the 7s 2 S

level.Lang’s observations in the vacuum ultraviolet yielded the 5/ 2 F° term but not the 4/ term. The latter was located by Sugar and Kaufman, who found 13 new terms based on their

measurements of 45 lines in the region 700-2000 A. Five of the highest terms were added by

Odabasi [1967], who also obtained the intervals for the 2 G terms.

All levels except those of 5c?

2 D and 4/ 2 F° are from Odabasi’s paper, and are accurate to about ±0.2 cm

-1

. He gives 74 La ill lines in the region 2200-11000 A. The four lowest levels are from Johansson and Litzen, whose measurements of the three 5c?-4/ lines (in the infrared)

yielded levels accurate to ±0.02 cm'1

. The ionization energy [Sugar and Reader, 1973] is based

on the three values for the limit obtained by Kaufman and Sugar [1971] from the ns, nf and

ng series. Odabasi resolved the hfs of the 6s 2 S 1/2 level, obtaining the sublevels 13590.56 cm' 1 (F=3)

and 13591.59 cm" 1 (F-4). His value for the hyperfine splitting (1.03±0.10 cm _l

) agrees well with

measurements made with higher resolution; Wittke [1940], for example, obtained the value

1.076±0.01 cm" 1

. Odabasi estimates that his values for the 2 G fine-structure intervals are accurate to ±0.10

cm" 1

, in which case the peculiar behavior of these intervals (an increase with increasing n, n

to 7) is an interesting theoretical problem.

References

Badami, J. S., Proc. Phys. Soc. London 43, 53 (1931). EL CL W

Gibbs, R. C., and White, H. E., Proc. Nat. Acad. Sci. (U.S.) 12, 551 (1926); Phys. Rev. 33, 157 (1929). EL CL W

Johansson, S., and Litzen, U., J. Opt. Soc. Am. 61, 1427 (1971). EL CL W

Kaufman, V., and Sugar, J., J. Opt. Soc. Am. 61, 1693 (1971). IP Lang, R. J., Can. J. Res., Sect. A 13, 1 (1935). EL CL W

Meggers, W. F., J. Res. Nat. Bur. Stand. (U.S.) 9, 239 (1932). W ZE

Odabasi, H„ J. Opt. Soc. Am. 57, 1459 (1967). EL CL W Hfs IP PT AT

Russell, H. N., and Meggers, W. F., J. Res. Nat. Bur. Stand. (U.S.) 9, 625 (1932). EL CL W ZE IP

Sugar, J., and Kaufman, V., J. Opt. Soc. Am. 55, 1283 (1965). EL CL W IP

Sugar, J., and Reader, J., J. Chem. Phys. 59, 2083 (1973). IP

Wittke, H, Z. Phys. 116, 547 (1940). Hfs

[October 1976]

225-298 0 - 78 -4
42

La ill

Configuration Term

J

Level (cm -1 ) 9

5p6( x S)5d 2 D 3/2 0.00 5 /2 1603.23

5p6( 1 S)4/ 2JT"> 5/2 7195.11, 7 / 2

8695.1,1

5p6( 1 S)6s 2 S V2 13591.14 2.10

5p6(‘S)6p 2p° 42015.01, 0.63 ai 2 45110.94 1.37

5p6( 1 S)7s 2 S V2 82347.28

5p6( 1 S)6d 2 D 3 /2 82380.76 5/ 2

82814.27

5p6 ( 1 S)5/ 2p° 5 /2 92454-54 7 / 2

92534-73

5p6 ( 1 S)7p 2 P° 1 h 93232.39 31 2 94461.44

5p6 ( 1 S)8s 2 S 1 h 110209.57

5p6 ( 1 S)7d 2 D 3 / 2 110534.20 3 1 2 110738.31 2 G 7 /2 114754.90 9/ 2

114755.34

5p6( 1 S)6/ 2p° 5/2 114889.80 7 / 2

114938.90

5p6( 1 S)8p 2 P° V2 11560226 3 / 2

116225.92

5p6( 1 S)9s 2 S l /2 124504.10

5p6( 1 S)8d 2 D 3/ 2

124742.24 5/2 124856.08

5p6( 1 S)6gr 2G 7 / 2

126952.47 9/ 2

126953.16

5p6( l S)7/ 2 F° 5/2 127042.58 7 /2 127075.60

5p6 ( 1 S)9p 2P° */2

127548.93 3 / 127935.04

5p6( 1 S)10s 2 S V2 132840.41

5p6( 1 S)9d 2D 3/ 2

133006.65 5/ 133076.90

5p

G ( 1 S)7p 2G 7 /2 134318.02 9/ 2

134319.39

5p6( 1 S)8/ 2p° 5/ 2

134373.83 7 / 134399.63

5p6( 1 S)8fif 2G 7 / 2

139100.48 9/ 139101.70

La iv CSo) Limit 154675 1
43

La iv

(Xe i sequence; 54 electrons) Z-57

Ground state (ls 2 2s 2 2p6 3s 2 3pe 3d 10 4s 2 4p6 4d 10 5s 2

) 5

p

6 ‘S 0

Ionization energy 402900± 500 cm 1 49.95± 0.06 eV

Reader and Epstein [1975, 1976] have observed this spectrum in the range 300-5200 A

using sliding-spark sources. Ten resonance lines from upper J= 1 levels were given in the 1975

paper, but about 200 lines are classified by the unpublished analysis used here. The connection

of the system of excited levels to the ground level should be accurate to about ±0.5 cm' 1

, and

the relative positions of most of the excited levels are accurate to ±0.2 cm" 1. All levels of the upper configurations are here designated in the J x l coupling scheme.

Leading eigenvector percentages in the LS scheme are also listed (after the word “or”) except

for the 5p

r

’ 4/ levels. The percentages are from Reader and Epstein [1976], whose calculations

of (5p

5 5d+5p5 6s) and (5p 5 6d+5p5 7s) included the configuration interactions.

Reader and Epstein [1975] obtained the quoted ionization energy from the 5p5 6s and 7s

levels by assuming a value for the difference in the quantum defects for these configurations.

References

Reader, J., and Epstein, G. L., J. Opt. Soc. Am. 65, 638 (1975). EL CL W IP Reader, J., and Epstein, G. L., unpublished material (1976). EL CL W PT

[March 1977]

La IV

Configuration Term J

Level (cm 1 ) Leading percentages

5p

6 0 0.0

5p5( 2Pa/2)4/ 2

[ 3

/ 2 ] 1 143354.7 2 145949.0

5p5( 2 PS/2)4/ 2

[ 5

/ 2] 3 149927.1 2 160486.4

5p5( 2PS/2)4/ T/2] 3 153339.1 4

5p5( 2 P3/2 )5d 2

[

1 / 2

]° 0 156100.3 100 or 100 3P°

1 158412.6 65 or 93 3P°

5p5( 2P§/2)5d 2

[ 3

/2

]° 2 162867.6 90 or 78 3P°

1 181155.0 51 or 88 3 D°

5p5( 2 P3/2 )5d 2

[ 7

/ 2

]° 4 163693.3 100 or

eo O

O’O 3 165070.7 78 or 74 3 F°

5p5( 2 P.3/2)5d 2

[ 5/2]° 2 167921.7 95 or 42 3F°

3 173335.5 80 or 62 3D°

5p5( 2 P!/2)4/ 2 P/2] 3

2 175013.8

5p5

( 2P!/2 )5d 2

[ 5/2]° 2 184885.7 91 or 55 3F°

3 190831.7 96 or 45 *F0
44

La IV—Continued

Configuration Term J

Level (cnr ') Leading percentages

5p5( 2Pf/2 )5d 2f3/2]° 2 188393.2 85 or 58 3D°

1 215919.2 59 or 93 ‘P

0

5p5( 2P§/2 )6s 2

f 3

/ 2

]° 2 198303.1 98 or 98 3P°

1 200183.3 99 or 59 *P°

5p5

( 2P!/2)6s 2[V2]° 0 219336.9 100 or 100 3P°

1 220506.9 99 or 59 3P°

5p5

( 2PS/2 )6p

2 tV2] 1 231008.7 86 or 70 3 S

0 244301.8 94 or 57 3P

5p5( 2P§/2)6p

2

[ 5

/2] 2 233401.5 85 or 54 3D

3 236790.4 100 or 100 3 D

5p5(2 p°/2 )6p

2

[ 3

/2] 1 237727.3 88 or 56 J P

2 239654.3 85 or 69 3 P

5p5

( 2P!/2 )6p 2

r 3

/ 2 ] 1 254251.3 91 or 70 3D

2 259224.3 100 or 45 3 D

5p5

( 2Pf/2 )6p

2

[

i / 2 ] 1 259085.9 90 or 59 3P

0 260449.8 94 or 57 ‘S

5p5( 2P§/2)6f? Vh]° 0 284205.8 100 or 100 3P°

1 284981.9 65 or 86 3P°

5p5(2p°/2)6rf 2

[ 7

/ 2

]° 4 28585642 100 or 100 3F°

3 285951.0 94 or 55 3F°

5p5(2p§/2 )6p 2

[ 3

/ 2

]° 2 286298.2 97 or 57 3P°

1 290596.2 63 or 52 1 P°

5p5( 2P3/2)6rf 2

[ 5

/ 2

]° 2 287402.6 98 or 51 'D°

3 287874-0 94 or 71 3 D°

5p5( 2P3/2 )7s 2

[ 3

/ 2

]° 2 292080.3 100 or 100 3P°

1 292777.8 97 or 62 X P°

5p5

( 2Pi/2)6rf 2

t 5/2]° 2 307183.0 97 or 72 3F°

3 308151.3 100 or 41 3F°

5p5

( 2P!/2 )6c? 2

[ 3

/ 2

]° 2 307398.4 97 or 41 3P°

1 310049.8 98 or 45 'P°

5p5( 2P!/2 )7s TO0 0 313512.4 100 or 100 3P°

1 313917.0 100 or 64 3P°

La v ( 2P§/2 ) Limit 402900
45

La V

(I i sequence; 53 electrons) Z=57

Ground state (ls 2 2s 2 2ps 3s 2 3p6 3d 10 4s 2 4pfi 4d in

) 5s 2 5p5 2 P

°

!/2

Ionization energy 497000± 5000 cm 1 61. 6± 0.6 eV

Identified odd configuration 5s 2 5p5

Identified even configurations 5s5p6

, 5s2 5p4 5d, 5s 2 5p4 6s

The levels and eigenvector percentages are from the analysis by Epstein and Reader

[1976], Their list of transitions from the even levels to the 5

p

5 2 P° ground-term levels extends

over the range 389-825 A. In addition to the 5s5p6 2 S 1/2 level, most of the levels of the 5p4 5d

and 5p 4 6s configurations that can combine with the ground term have been found. The

uncertainty of the 5p5 2 P

°

/2 and 5s5p 6 2 S 1/2 levels relative to the 2 P

°

!/2 ground level is ±1 cm

-1

; the uncertainty increases for the higher levels to about ±3 cm

-1 at 250000 cm'1

. We have

rounded off the levels above 180000 cm

' 1 to the nearest cm' 1

. Epstein and Reader based their interpretation on a calculation of the three known even

configurations, with the configuration interactions being included. Eigenvector percentages for

the 5p 4 6s configuration are given here in the Jx j coupling scheme, the second percentages

being from the unpublished complete eigenvectors [Epstein and Reader, 1975]. We have

omitted names for several even levels, and some of the retained names have little or no

meaning. For example, two /=% levels with leading percentages well below 40% are assigned

to terms. The two leading percentages for the nominal 5p4

(

:, P)5d 4 D 1/2 level (169748.5 cm' 1 ) are almost identical to those for the unnamed level at 185115 cm'1

. Epstein and Reader note strong configuration mixing in several of the eigenvectors. Although the interaction between

the 5s5p 6 2 Si/2 and 5p4 ('D)5d 2 S U2 levels is less in La v than for lower sequence members, the

La v 5s5p 6 2 S 1/2 level is displaced about 25000 cm

' 1 by this perturbation. The 5p4 5d-5p4 6s interaction is also strong (30-40% admixture) for two pairs of levels. Good agreement between the calculated and experimental even levels was necessary for

the analysis, since the J values could not be determined unambiguously before the levels were

identified. In general the even levels having J=V2 or % are based on pairs of lines separated

by the 2 P°/ 2 _ 2 P°/2 wavenumber interval. The questionable level at 169748 cm' 1

, designated

5p 4(

:1 P)5d 4 D 1/2 , is an exception derived from a single line. Each of the levels having is also based on a single allowed transition (to the 2 P

°

/2 ground level), but all such transitions clearly belong to La v and have wavelengths close to the

predicted values. The level designated 5p4 (

3 P2 )6s (2,

2 ) 5/2 , at 225191 cm' 1

, is less certain

because of the relative weakness of the transition. The assignment of the /=% level for this term is also uncertain, because of ambiguity in the J values of this level (228545 cm' 1 ) and the

nearby level at 228916 cm'1

; it is possible that the J values and eigenvector assignments of

these two levels should be interchanged [Epstein and Reader, 1976].

Epstein and Reader obtained the ionization energy from the 5p4

( 3 P.,)6s ( 2,V2 ) term by

using an estimated value of the effective quantum number n*(6s). A correction for the

perturbation of this term was included.

References

Epstein, G. L., and Reader, J., unpublished material (1975). PT

Epstein, G. L., and Reader, J., J. Opt. Soc. Am. 66, 590 (1976). EL CL W Hfs IP PT AT

[October 1976]
46

LaV

Configuration Term J

Level (cm' 1 ) Leading percentages

5s2

(

x S)5p5 2 p° 3

/ 2 0.0

‘/2 2163LI

5s 5p

6 2 S

X /2 142970.1 70 28 5p4

(

x D)5d 2 S

5s2

(

x S)5p4

( 3P)5d 4 D 5

/2 166600.9 75 7 ( 3P) 4 F

3 /2 167307.9 65 12 ( 3P) 4 P

7 /2 77 16 ( 3P) 4 F

l h 169748.5? 52 19 (

X D) 2 P

5s2

(

x S)5p4

( 3P)5d 4 P 3

/2 182670 33 20 (

X S) 2 D

1 h 183552 74 14 ( 3P) 2 P

S

/2 189842 52 18 ( 3P) 2 F

5s2

(

x S)5p4

( 3 P)5d X /2 185115 00 .U o 23 (

X D) 2 P

5s2

(

x S)5p4

( 3P)5d 4JT 9

/2 83 17 (

X D) 2G

5

/2 187535 80 7 ( 3P) 4 D

3

/ 2 188299 67 19 ( 3P) 4 P

7 /2 49 23 ( 3P) 2 F

5s2

(

x S)5p4

( 3 P)5d 3

/ 2 190217 29 4 D 23 (

X D) 2D

5s2

(

x S)5ps4

(

x D)5d 3

/

2

196794 28 2 P 28 ( 3P) 2P

5s2

(

x S)5p4

(

x D)5d 5

/2 198577 26 2 D 24 (3P) 4 P

5s2

(

x S)5p4

( 3 P)5<2 2 F 7 /2 43 29 ( 3P) 4 F

5

/2 200771 51 23 (

X D) 2 F

5s2

(

x S)5p4

(

x D)5d 2 F 5

/2 207398 61 27 (

X D) 2 D

? /2 78 14 ( 3P) 2 F

5s2

(

x S)5p4

(

x S)5d 2 D 3

/ 2 222023 35 28 (

X D) 2P

S

/2 236365 64 11 ( 3P) 2 F

5s2

(

1 S)5p4

( 3P2 )6si/2 (2,

1

/2) 5

/2 225191? 81 15 (

x D2 ) (2,x / 2) 3

/ 2? 228545* 54 15

5s2

( l S)5p4(

1 D)5d? 2 S? X / 2 ? 228916 49 19 5s 5p6 2S

5s2

(

x S)5p4

( 3P)5d 2 D 5/ 2 229740 58 24 (

X D) 2 D

3

/ 2 250921 43 29 (

X S) 2 D

5s2

(

x S)5p4

( 3P)5d 3

/

2

231424 24 2P 22 (

X D) 2 D

5s2

(

x S)5p4

( 3 P)5d 1 l2 237222 30 2P 28 (

X D) 2P

5s2

(

1 S)5p4

( 3Po)6si/2 X /2 240308 38 (0,

x / 2 ) 17 (

x D)5d 2 S

5s2

(

1 S)5p4

( 3Pi)6si/2 (l, 1 /*) 3

/ 2 246854 96 3 (

x D2 ) (2,

x / 2)

1 h 250411 94 3 (

x So) (0,

x

/ 2 )

5s2

(

1 S)5p4

(

1 D2 )6si/2 (2, x / 2 ) 5 h 255936 83 15 ( 3P2 ) (2

,

x

/ 2 ) 3

1 2 257047 73 20

La vi ( 3 P2 ) Limit 497000
CERIUM

Ce I

58 electrons Z-58

Ground state (ls 2 2s 2 2p6 3s 2 3p6 3d 10 4s 2 4p6 4d 10 5s2 5p6

) 4/5d6s2 ‘G°

Ionization energy 44672± 3 cm' 1 5.5387± 0.0004 eV

Identified odd configurations 4/5d6s2

, 4/5d2 6s, 4/5cC?, 4/ 2 6s6p

Identified even configurations 4/ 2 6s 2

, 4/ 2 5d6s, 4/6s 2 6p, 4/5d6s6p, 4/5d2 6p, 4/ 2 5d2

Energy Levels, Wavelengths

The levels are from Martin’s unpublished tables for this spectrum [1975]; the low levels of

both parities up to 10000 cm 1 have been published previously [Martin, 1971], The odd levels are given here to 31000 cm -1

, and the table of almost 700 even levels includes all those known

below 30000 cm' 1

. Many of the levels in the working lists above these points are not yet well

established.

The uncertainty for a number of the odd levels below 5000 cm”1 is ±0.001 to ±0.003 cm' 1

, and most of the high even levels (>15000 cm

-1

) have uncertainties of less than 0.01 cm' 1

. The

low even levels and the high odd levels have uncertainties of 0.01 to 0.02 cm'1

. About 15000 lines are classified as transitions from high even levels to the low odd group

belonging mainly to 4/5d6s2 and 4/5d2 6s. A relatively small part of the spectrum arises from

transitions to the low even levels. The principal line list, a table of wavelengths for the

region 3000-10000 A measured by Martin, Corliss, and Blanc, is unpublished. However,

almost 1000 of the strongest Ce I lines are listed in the NBS intensity tables [Meggers, Corliss,

and Scribner], most with energy-level classifications from Martin’s analysis, and a published Ce

line list for the infrared (0.82-2.4 p.m) has about 1100 classified Cel lines [Verges, Corliss,

and Martin], The older line lists of King [1928] and of Paul [1936] were useful for their definite

assignments of lines to Ce I. Martin and Wilson have reobserved the absorption spectrum to below 3000 A, but no list of the wavelengths has been prepared.

Zeeman Data, Optical and Magnetic-Resonance Investigations

The three-place (and two-place) g values have been obtained from measurements of

Zeeman patterns for several thousand lines [Martin, 1975]. Childs and Goodman used the

atomic-beam magnetic-resonance technique to obtain the 5-place g values quoted for 32 low

odd levels and for the lowest even level. This appears to be the largest number of such atomicbeam g-value determinations made for any atom thus far. The uncertainties range from 2 to 10

units in the fifth place. The uncertainty for the optically determined values also varies, and in most cases it is less than 0.01. Smith and Spalding [1961] used the atomic-beam magnetic-resonance technique to make

the first measurements of three g values in Ce I. The corresponding levels were found and

included in the 15 low odd levels located in the first successful analysis of the optical

spectrum; they were shown to be the nominal 4/5d6s2 ‘G^, and 3 F° levels [Martin, 1963],

No simultaneous determinations of J and g values for Ce I levels have been made by the

atomic-beam magnetic-resonance method. Using a beam of cerium-143 atoms, Maleh [1965]

observed resonances that he associated with the three low levels for which Smith and Spalding

had obtained g values. Maleh’s interpretation of the resonances for two of the levels is in agreement with the J values obtained from analysis of the optical spectrum, but his interpretation of a third set of resonances as due to a low level having g=0.7651 and J=4 is inconsistent with the more detailed and highly redundant optical data [Martin, 1963; 1971].
48 Ce I —Continued

Theoretical Calculations, Status of the Analysis

Most of the theoretical calculations of Ce I have been carried out by Z. Goldschmidt and

her colleagues at the Hebrew University of Jerusalem. The eigenvector percentages for the

low odd configuration group (4/5d6s 2 +4/5d2 6s+4/5d3

) are from a calculation by Goldschmidt

and Salomon [1970] that included configuration interactions and effective interactions. The

levels having low term purities could be reliably interpreted only with such calculations, and

Martin’s [1971] arrangement of these levels was also based on the eigenvectors of Goldschmidt

and Salomon. We have allowed fewer practically meaningless term names for low-purity levels

in the arrangement here, since the two leading percentages are listed. The levels are complete to above 10000 cm”1

, but the assignments of two odd levels having

J=4 (3100 and 3312 cm” 1 ) might possibly be interchanged, as might those of two levels having

J=5 (7715 and 7842 cm” 1 ). Experimental g values are lacking for most of the low odd levels above 10000 cm” 1

, and only a few odd levels above 10500 cm” 1 have been assigned at this stage. It is almost certain, however, that the lowest predicted level of either parity not yet

found is a

3 P„ level (mainly from 4/5d2 6s) calculated by Goldschmidt and Salomon to be near

12000 cm”1

. The region below this point has 113 odd levels. Goldschmidt notes that 4/ 2 6s6p and 4/ 2 5d6p have been added to the three odd

configurations mentioned above in a more recent calculation of all five configurations with

interaction. The assignments of several odd levels above 18000 cm”1 to JjJ2 -coupling terms of

4/ 2 6s6p are taken from this preliminary work by Goldschmidt and Salomon [1973], An

extension of the experimental data (such as g values) will probably be necessary before enough

levels can be reliably assigned to the 4/5d3

, 4/ 2 6s6p, and 4/ 2 5d6p configurations to allow

improvement of the theoretical parameters.

Only the lowest few terms of the system of even levels could be identified without

extensive calculations [Martin, 1971]. Y. Oreg [1973], under the direction of Zipora

Goldschmidt, has constructed and carried out the first diagonalizations of the necessary

matrices. The eigenvector percentages for the even levels are from Oreg’s calculation of the

nine configurations (4/

2 6s 2 +4/ 2 5d6s+4/ 2 5d2 +4/5d6s6p+4/5d2 6p+4/6s2 6p+5d2 6s 2 +5d3 6s+5d4 ). Most of the eigenvectors are highly mixed with regard to both configuration and term type.

(Both the direct configuration interactions and effective interactions were included.)

Comparison of the calculated and experimental levels shows that the great majority of

predicted levels have been found up to about 27000 cm”1

, and that they belong primarily to a mixture of the first six of the above configurations. In many cases, however, the calculated

levels and g values are not sufficiently accurate to allow unambiguous correlations with the

experimental levels of this dense system. We have not entered eigenvector percentages for the even levels above some particular level (depending on the J value) at which uncertain

assignments become too numerous. Most of the interpretation up to about 20000 cm 1 appears

secure, however, the assignments here being in general those made by Oreg. Some of the more

questionable assignments are so marked. A few assignments were changed on the basis of line intensities and/or g values, and a number of additional assignments were made [Martin, 1975],

The interpretation at this stage establishes at least the lower portions of the first six of the

above configurations except 4/ 2 5d2

, and a few of the assigned levels have large 4/ 2 5d 2 components. Practically all of the 4/ 2 6s2 configuration except 'S0 is now accounted for.

Isotope Shifts, Ionization Energy

Champeau [1972] has derived values of the isotope shifts associated with the 4/5d2 6s,

4/ 2 6s 2

, and 4/ 2 5d6s configurations, taken with respect to zero shift for 4/5d6s2

. A tentative

and rough comparison of Oreg’s eigenvectors for a number of even levels for which Champeau

[1969] has obtained isotope shifts indicates a general consistency of the results; the isotope

shifts of several additional even configurations could be obtained.

Worden, Conway, Paisner, and Solarz [1977] have observed high members of two series in Ce i by using laser techniques. These data became available too late for inclusion here, but the

quoted ionization energy is a new determination from these series.
Ce I —Continued 49

References

Champeau, R.-J., Thesis, Univ. Paris, Orsay, 83 pp. (1969). IS Champeau, R.-J., Physica (Utrecht) 62, 209 (1972); ibid., 225 (1972). IS

Childs, W. J., and Goodman, L. S., Phys. Rev. A 1, 1290 (1970). ZE

Goldschmidt, Z. B., and Salomon, D., unpublished material (1970; 1973). ND PT

King, A. S., Astrophys. J. 68, 194 (1928). W

Maleh, I., Phys. Rev. 138, B766 (1965). Hfs

Martin, W. C., J. Opt. Soc. Am. 53, 1047 (1963). EL ZE

Martin, W. C., Phys. Rev. A 3, 1810 (1971). EL ND ZE

Martin, W. C., unpublished material (1975). EL ND CL W ZE

Meggers, W. F., Corliss, C. H., and Scribner, B. F., Nat. Bur. Stand. (U.S.), Monogr. 145, Part I, 403 pp. (1975). CL W

Oreg, Y., Thesis, Hebrew Univ. Jerusalem, Israel, 201 pp. (1973). ND PT

Paul, F. W., Phys. Rev. 49, 156 (1936). W

Smith, K. F., and Spalding, I. J., Proc. R. Soc. London, Ser. A., 265, 133 (1961). ZE

Verges, J., Corliss, C. H., and Martin, W. C., J. Res. Nat. Bur. Stand. (U.S.) 76A, 285 (1972). CL W

Worden, E. F., Conway, J. G., Paisner, J. A., and Solarz, R. W., unpublished material (1977). IP

[July 1976]

Ce I, Odd Parity

Configuration Term J

Level (cm 1

) 9 Leading percentages

4/5d 6s2 i G

° 4 0.000 0.94543 55 29 3 H°

4/5d 6s2 3 F° 2 228.849 0.76515 66 24 >D“

3 1663.120 1.07736 85 7 4/( 2 F°) 5d2(!D)6s ( 2 D) 3 F°

4 3100.151* 1.07703 34 27 4/( 2 F°) 5d2

( 3F)6s ( 4 F) 5 I°

4/5d 6s2 3 H° 4 1279.424 0.88979 54 20 1 G°

5 2208.657 1.03212 80 12 4/(2 F°) Sc^TOs ( 2 D) 3 H°

6 3976.104 1.16032 78 13 4/(2 F°) ( 2 D) 3 H°

4/5d 6s2 3G° 3 1388.941 0.73494 66 11 4/(2F°) 5d2

(

1 D)6s ( 2D) 3G°

5 4199.367 1.15021 48 34 4/( 2 F°) 5d2

( 3 F)6s ( 4 F) 5 H°

4/(2 F°) 5d2

( 3 F)6s ( 4 F) 5 H

° 3 2369.068 0.59978 66 16 4/5d6s2 3G°

4 2437.629 0.98592 38 25 ( 2 F°) ( 3 F)(4 F) 3G°

6 4746.627 1.16593 67 24 ( 2 F°) ( 3 F)(4 F) 5I° 7 5802.108 1.237 62 38 ( 2 F°) ( 3 F)(4 F) 5 I°

4/5d 6s2 1 D

° 2 2378.827 0.93654 54 23 3 F°

4/(2 F°) 5d2

( 3 F)6s ( 4 F) s r 4 3196.607 0.66612 67 11 4/5d6s2 3F°

5 3764.008 0.90691 90 3 4/5d6s2 3 H°

6 4455.756 1.11714 64 26 ( 2 F°) ( 3 F)(4 F) 5 H°

7 5315.803 1.21625 56 33 ( 2 F°) ( 3 F)(4 F) 5 H°

8 6809.128 1.250 100

4/(2 F°) 5d2

( 3 F)6s ( 4 F) 5 3210.583 1.16277 41 3G° 37 ( 2 F°) ( 3 F)(4 F) 5 H°

4/5d 6s2 4 3312240* 1.08582 29 3p° 26 3 G°

4/5d 6s2 3 D° 1 3710.513 0.61549 64 10 4/(2 F°) 5d2

(

1 D)6s ( 2 D) 3 D°

2 4766.323 1.14945 67 12 4/(2 F°) 5d2

(

l D)6s ( 2 D) 3 D°

3 5006.719 1.23674 58 20 ip°

4/(2 F°) 5d2

( 3 F)6s ( 4 F) 0 3974.503 29 5 D° 23 ( 2 F°) GDl^D) 3P°

4/(2 F°) 5d2

( 3 F)6s ( 4 F) 1 4020.954 1.49404 17 3S° 15 ( 2F°) (

1 D)(2 D) 3P°

4/(2 F°) 5d2

( 3 F)6s ( 4 F) 3 G° 3 4160283 0.72933 47 23 ( 2F°) ( 3 F)(4 F) 5 H°

4/(2 F°) 5d2

( 3 F)6s ( 4 F) 4 4173.494 1.02948 41 3G° 30 ( 2 F°) ( 3 F)(4 F) 5 H°

4/(2 F°) 5d2

( 3 F)6s ( 4 F) 5 4417.618 1.17790 29 3G° 28 4/5<f6s2 3G°
50

Ce I, Odd Parity—Continued

Configuration Term J

Level (cm -1

) 9 Leading percentages

4/(2 F°) 5d2( 3 F)6s ( 4 F) 3 S° l 5097.777 1.88257 49 25 ( 2 F°) ( 3 F)(4 F) 5 D°

4/(2 F°) 5d2( 3 F)6s ( 4 F) 2 5210.906 1.22694 28 S D° 27 ( 2F°) ( 3 F)(4 F) 5G°

4/(2 F°) 5d2

( 3 F)6s ( 4 F) 5G° 2 5409236 0.773 35 24 ( 2 F°) ( 3 F)(4 F) 5 D°

3 6234-792 1.04965 69 13 ( 2 F°) ( 3F)(4 F) 5D°

4 6856.559 1.150 72 6 ( 2 F°) ( 3 F)(2 F) X G°

5 7467.160 1.179 69 7 ( 2 F°) ( 3 F)(4 F) 3 H°

6 8055.526 1.207 50 18 ( 2F°) ( 3 F)(4 F) 3H°

4/(2 F°) 5d2( 3 F)6s ( 4 F) 3 5519.751 1.24530 32 s D

° 21 ( 2 F°) ( 3 F)(4 F) 3 F°

4/(2 F°) 5d2

( 3 F)6s ( 4 F) 0 5571.156 44 5 D° 35 4/5d6s2 3P°

4/(2 F°) 5d2( 3 F)6s ( 4 F) 4 5572.074 1.31658 29 5D° 27 ( 2F°) ( 3 F)(4 F) 3 F°

4/5d 6s2

1 5637233 1.389 30 3p° 26 4/(2 F°) 5d2

( 3F)6s ( 4 F) 5 D°

4/(2 F°) 5d2( 3 F)6s ( 4 F) 5jr° 1 5674-829 0.140 73 6 ( 2F°) ( 3 F)(4 F) 5D°

2 5904-006 0.905 66 13 ( 2F°) ( 3 F)(4 F) 5G°

3 6337.061 1.232 42 16 ( 2 F°) ( 3F)(4 F) 5D°

4 7174-156 1.373 67 19 ( 2 F°) ( 3 F)(4 F) 5 D°

5 7933.558 1.345 81 5 ( 2 F°) ( 3 P)(4 P) 5 F° 4/5d 6s2 2 6303.984 1.419 36 3P° 16 4/(2 F°) 5d2

(

x D)6s ( 2 D) 3P°

4/(2 F°) 5d2

( 3 F)6s ( 2 F) 4 6475.540 0.897 43 3 H° 17 ( 2F°) ( 3 F)( 2 F) X G°

4/5d 6s2 3 6621.892 1.147 35 ip° 17 3 D

°

4/(2 F°) 5d2( 3 F)6s ( 4 F) 5 6663226 0.953 19 3 r 18 ( 2 F°) ( 3 F)(2 F) 3 I° 4/(2 F°) 5d2

( 3 F)6s ( 4 F) 2 6836.628 0.68078 33 3 F° 18 ( 2 F°) ( 3 F)(4 F) 5G°

4/(2 F°) 5d2( 3 F)6s ( 4 F) 3 7169.751 1.13 28 3p° 26 ( 2 F°) ( 3 F)(4 F) 5 F°

4/(2 F°) 5d2

( 3 F)6s ( 2 F) 4 7348299 0.964 22 1 G° 21 ( 2 F°) ( 3 F)(4 F) 3 H°

4/(2 F°) 5d2

( 3 F)6s ( 4 F) 6 7696210 1.076 39 3r 19 ( 2 F°) (

1 G)(2G) 3 1° 4/(2 F°) 5d2

( 3 F)6s ( 4 F)? 5 7715236 0.934 22 3J° 14 ( 2 F°) ( 3 F)(4 F) 5G°

4/(2 F°) 5d2

( 3 F)6s ( 2 F)? 5 7841.955 1.063 24 3 H° 21 ( 2 F°) ( 3F)(2 F) 3 I° 4/(2 F°) 5d2

(

1 D)6s ( 2 D) 1 7853.119 0.983 27 ipo

16 ( 2 F°) ( 3 F)(2 F) 3 D°

4/(2 F°) 5d2

( 3 F)6s ( 4 F) 4 7890.429 1.242 25 3p° 18 ( 2 F°) ( 3 F)(4 F) 5 D°

4/(2 F°) 5d2

( 3P)6s ( 4 P) 5G° 2 8088.912 0.403 95 3 ( 2 F°) ( 3 F)(4 F) 5G°

3 8307.309 0.957 81 6 ( 2 F°) ( 3P)(4 P) 3G°

4 8762.126 1.054 50 9 ( 2 F°) ( 3 F)(2 F) 3 H°

5 9462.705 1.19 46 12 ( 2 F°) ( 3P)(4 P) 3G°

6 11030.470 1.193 51 21 ( 2 F°) ( 3 F)(2 F) 3 H°

4/(2 F°) 5d2

( 3 F)6s ( 4 F) 5 P° 2 8101.187 1.735 85 5 ( 2 F°) ( 3 F)(4 F) 5S° 3 8270249 1.504 74 11 ( 2 F°) ( 3 F)(4 F) 3 D°

1 8430.846 2.04 62 10 ( 2 F°) ( 3F)(4 F) 3P°

4/(2 F°) 5d2

( 3 F)6s ( 2 F) l S° 0 8351.167 44 17 4/5d6s2 3 P°

4/(2 F°) 5d2

( 3 F)6s ( 4 F) 2 8366.098 1.525 33 3P° 16 ( 2F°) ( 3 F)(4 F) 5S° 4/(2 F°) 5d2

( 3 F)6s ( 2 F) 5 8400.730 0.917 30 3 J° 19 4/5d6s2 1 H°

4/(2 F°) 5d2

( 3 F)6s ( 2 F) 4 8509209 0.954 20 3 H° 19 ( 2F°) ( 3P)(4P) 5G°

4/(2 F°) 5d2

( 3 F)6s ( 4 F) 3 J° 7 8587.973 1.155 59 24 ( 2 F°) (

X G)(2G) 3 I° 4/(2 F°) 5d2

( 3 F)6s ( 4 F) 6 8603.531 1.225 36 5G° 25 ( 2F°) ( 3 F)(4 F) 3 H°

4/(2 F°) 5d2

( 3 F)6s ( 4 F) 1 8695201 1.285 22 3P° 12 ( 2 F°) ( 3 F)(4F) 5P°

4/(2 F°) 5d2

( 3 F)6s ( 2 F) 3 8902.306 1.128 20 ip° 14 4/5d6s2 1 F°

4/(2 F°) 5d2

( 3 F)6s ( 2 F) 5 8991.451 1.067 31 3 H° 17 ( 2 F°) ( 3P)(4P) 5G°
51

Ce I, Odd Parity—Continued

Configuration Term J

Level (cm-1

) 9 Leading percentages

4/(2 F°) 5d2

( 3 F)6s ( 4 F) 0 9119.094 40 3P° 32 ( 2 F°) ( 3 F)(2F) 1 S°

4/(2 F°) 5d2( 3 P)6s ( 4P) 3 D° 3 9135.099 1.274 50 12 ( 2 F°) ( 3 F)(4 F) 5P°

4/(2 F°) 5d2( 3 F)6s ( 2 F) 2 9200.707 1.376 24 3 D° 21 ( 2 F°) ( 3 P)( 2 P) 3 D°

4/(2 F°) 5d2( 3 F)6s ( 2 F) 3J° 6 9333222 1.047 61 20 ( 2F°) (>G)(2G) 3 I° 7 11061.551 1.141 79 16 ( 2F°) (

1 G)(2G) 3 I°

4/(2 F°) 5d2( 3 F)6s ( 4 F) 1 9369.628 1.065 21 3P° 17 ( 2F°) ( 3 F)(2 F) 3 D°

4/(2 F°) 5d2( 3 P)6s ( 4 P) 3 D° 2 9425.529 1.207 46 8 ( 2F°) ( 3F)(4 F) 5S°

4/(2 F°) 5d2( 3 F)6s ( 2 F) 3 F° 2 9709.012 0.799 51 13 ( 2F°) ( 3P)(2P) 3F°

4/(2 F°) 5d2

( 3 F)6s ( 2 F)? 3G° 3 9787220 0.868 42 26 ( 2 F°) ( 3P)(2P) 3G°

4/(2 F°) 5d2(‘G)6s ( 2G) 6 9830.608 1.081 31 1 I° 12 ( 2 F°) ( 3 F)(2 F) »r

4/(2 F°) 5d2( 3 P)6s ( 4P) 1 9903.122 0.813 38 3 D° 14 ( 2 F°) ( 3P)(4P) 5F°

4/(2 F°) 5d2( 3 F)6s ( 4 F) 5 S° 2 9947.822 1.63 52 18 ( 2 F°) ( 3 F)(4 F) 3P°

4/(2 F°) ( 2 D)? 3 9996.647 24 3G° 16 ( 2F°) ( 3P)( 2P) 3G°

4/(2 F°) 5d2(*D)6s ( 2 D) 4 10243.780 18 X G° 13 ( 2F°) ( 3P)(2P) ‘G

0

4/(2 F°) 5d2

( 3 P)6s ( 4 P) 5 D

° 0 10249.014 62 23 ( 2 F°) ( 3 F)(4 F) 5 D°

4/(2 F°) 5d2( 3 F)6s ( 2 F) 3 10318.438 20 3p° 18 ( 2 F°) ( 3 F)(4 F) 3 D°

4/(2 F°) 5d2

( 3 P)6s ( 4 P) 1 10409.273 39 5 D° 24 ( 2F°) ( 3P)(4 P) 5 F°

4 10586.772

3 10604.889

2 10612.867

4/(2 F°) 5d2

( 3 P)6s ( 4 P) 6 10673.847 1.201 40 5G° 23 ( 2 F°) ( 3 F)(2 F) 3 H°

4 10723.512

3 10774-605

4/(2 F°) 5d2

(

1 G)6s ( 2 G) 5 10879.793 1.10? 27 i H

° 20 ( 2 F°) (

X G)(2 G) 3G°

2 10901.971

3 11131.710

4 11271.088

2 11301.537

3 11337.859 0.860 4/5d 6s2 5 11357.036 20 x H

° 15 4/(2 F°) 5d2

( 1 G)6s ( 2G) l H°

1 11517.044

4 11545.398 1.174?

1 11578.951

1 11626.193

2 11650.367

4 11796.367

4 11810.672

4/(2 F°) 5d2

( 3 F)6s ( 2 F) 3 G° 5 11850252 60 12 ( 2 F°) ( 3 P)(2P) 3G°

3 11874.016

2 12022.199

1,2 12297.629

4/(2 F°) 5d2

(

1 G)6s ( 2G) 5 12297.781 1.12? 39 3 H° 9 ( 2F°) ( 3 P)(4P) 3 G°

4 12351.320
52

Ce I, Odd Parity—Continued

Configuration Term J

Level (cm ') 9 Leading percentages

1 12359.009

4 12425.898

2 12454.486

3 12600.087

4 12720.115

5 12793.504

2 12873.850

5 12948.901 4 12988.140

3 13089.798

2 13139.668

1 13214-677

4/(2 F°) 5d2(

1 G)6s ( 2G)? 3 H°? 6 13219.389 56 8 ( 2F°) ( 3 F)(2 F) 3 H°

5 13297212

4/(2 F°) 5d2

(

1 G)6s ( 2G) 3 K° 6 13301.147* 74 14 4/(2 F°)5d3

( 2G) 3 K°

7 13572.014 1.021 57 26 ( 2 F°) (

X G)(2G) X K°

8 15333298 81 13 4/(2 F°)5d3

( 2G) 3 K°

3,4 13315.568

2,3 13409.732

1 13451.017

5 13519.477

2 13622.021 5 13629.358

4,5 13815.996

3 13903.145

3 13924-569

6 14001.960

3,4,5 14027.718

6 14107.938

4 14116215

5,6 14186.567

5,6 14218.083

3 14273213

2 14310.076

5 14338.872

4 1441 7.612

4 14531.530

3 14697.478

5 14766.727

4/(2F°)5d3

( 4 F)? 5 I°? 7 15021.768 83 6 ( 2F°)(4 F) 3 I°

4,5 15063.392

4 15077.9761

6 15101.3711

5,6 15131.583
53

Ce I, Odd Parity—Continued Ce I, Odd Parity—Continued

Configuration Term J

Level (cm' 1 ) 9 Configuration Term J

Level (cm _1

) g

5 15255.040 4/2

( 3 He)6s6p( 1 P?)? (6,1)°? 5 27192.3001 1.159 6 15382.028

6

7

271*91.670 1.148

6 151*91.666

7 15677.661* 3 27593.61*1 0.940

7 15917.077 4/2

( 3 F2 )6s6p( 1 Pi)? (2,1)°? 2 27696.365 0.68?

6 16990.1*81 4 27766.972 0.694

6 1 7138.587

5 27796.11*0 1.045

4,5 1801*2.671* 7 27880.736 0.920

3 18186.160

5 27909.999 0.915

5 18221.783

6 27912.105 0.848

6 28122.510 4/2

( 3 H4 )6s6p(3 P?) (4,1)° 35 18281*.583 0.956

1,2,3 2831*1.689 4 4 283U-003 1.05

4 18676.826 5 28555.91*1 0.809

5 18732201*

3 28621.912

5 18790.605

4 2861*1*.31*2 1.039

5 19073.71*0 3 28726.936 0.947

4 19510.332 5 2871*1*.9 1*1 0.813

5,4 19530.380

6 28757.305 0.999

3 19624-51*8

4 2881*7.533

5 19782.885

5 28850.009 1.116

5,4 19863.308

6 28901*.031*

2 1991*1.382 7 2891*0252

6,5 19982.138 6,5 2891*3.559 4 20621.926 5 29099.161* 0.993

6,5 21796.170 4 29202.301* 0.979? 4 23697.5891 1.220? 4 29257.977

4/2

( 3 H4 )6s6p( 1 P?) (4,1)° 5 23819.871 0.890

4 29377.007

4 23901.786 0.904 6 291*32.305 0.925 3 2 291*1*3.866 5 2391*7.1*221 1.173? 6 29561*.126 4 21*320.5761 1.117? 5 2962821*5

4 21*1*26.131 1.082 5 29704.676

6 21*712.835 1.092 6 29731*.631* 5 21*839.872 1.05? 3 29839.334 1.174 4 21*957.611* 0.998 2,3 30034.780

3 25078.953 0.997 3 30098.186

3,4,5 25384.989 0.80? 5 30128.922

5 26287.707 1.035 5 30233.702 1.155? 6 26538263 0.980 3 30402.116

4 26576.399 1.043 4 301*39275

6 26585.577 4,5 30470.391

5 26612.1*51* 7 30511.959

5 26868.899 0.790 3 3051*2299
54

Ce I, Odd Parity—Continued Ce I, Odd Parity—Continued

Configuration Term J

Level (cm -1

) 9 Configuration Term J

Level (cm -1

) 9

4,5 30559272 4 30787.639 0.695? 5 30566.948 3 30854.052 0.737

6 30603.359 7 30876234

4,3 30624.042 2 30991.841

2 30706.313

4 30739270

3 30740.884 Ce II ( 4 H?/2) Limit 44672

5 30767.047

Ce I, Even Parity

Configuration Term J

Level (cm -1

) 9 Leading percentages

4/2 6s2 3 H 4 4762.718 0.80508 89 4 4/5d(3 G°)6s6p( 1 P°) 3 H

5 6238.934 1.035 92 4 6 7780.202 1.169 92 4

4/2 6s2 3 F 2 8235.605 0.680 88 4 4/5d(3 F°)6s6p( 1 P°) 3 F

3 9206.305 1.083 90 4 4/5d(3 F°)6s6p(»P°) 3 F

4 9379.148 1.139 55 32 l G

4/2 6s2 *G 4 11361.895 1.101 52 35 3F

4/2

( 3 H)5d ( 4 I)6s 5

I 4 12114.115 0.655 59 17 ( 3 H)(2 H) 3 H

5 13124.010 0.957 50 14 ( 3 H)(2 H) ‘H

6 13605.000 72 8 ( 3 H)(4 I) 3

I 7 14609.088 78 5 ( 3 H)(4 I) 3

I 8 85 5 4/(2F°)5d2

( 3 F) ( 4 H°)6p 5

I

4/2

( 3 H)5d ( 4 K)6s 5 K 5 12366.834 0.710 63 9 ( 3H)(2 H) 'H

6 12960.950 0.90 75 8 ( 3 H)(4 K) 3 K

7 13908.826 84 7 ( 3 H)(4 K) 3 K

8 89 4 ( 3 H)(4 K) 3 K

9 96 4 4/(2 F°)5d2

( 3 F) ( 4 I°)6p 5 K

4/2( 3 H)5d ( 4 K)6s 5 12467.827 0.948 22 5 K 20 ( 3 H)(2 H) 3 H

4/2

( 3 H)5d ( 4 G)6s 5G 2 12992.115 0.388 38 24 4/5d(3 F°)6s6p(3P°) 5G

3 13389.827 0.919 40 15 4/5d(3 F°)6s6p(3 P°) 5G

4 14064.382 46 11 ( 3 F)(4G) 5G

5 46 12 ( 3F)(4G) SG

6 16066.940 1.260 44 14 ( 3 F)(4G) 5G

4/2

( 3 H)5d ( 2 H)6s 3 H 4 13194.849 0.775 45 13 ( 3H)(4 I) 5

I 6 13939.793 1.127? 46 10 ( 3F)(2 H) 3 H
55

Ce I, Even Parity—Continued

Configuration Term J

Level (cm -1

) 9

Leading percentages

4/5d(1 G°)6s6p(3 P°) 4 13513.875 0.806 22 3 H 18 ( 3 H°)(3P°) 3 H

4/5d( l G°)6s6p(3 P°) 5 13784.151 1.023 19 3 H 17 ( 3 H°)(3P°) 3 H

4/2

( 3 H)5d ( 2 H)6s 5 13881.444 0.990 20 3 H 20 ( 3 H)(2 H) ‘H

4/2( 3 H)5d ( 4 H)6s 3 13902.760 0.665? 42 5 H 26 4/5d(3G°)6s6p( 3P°) 5 H

4/2( 3 H)5d ( 4 G)6s 2 14098.305 0.484 27 5G 26 4/5d(3 F°)6s6p( 3P°) 5G

4/5d(3 H°)6s6p(3 P°) 3 14136.322 0.649 40 5 H 20 (

1 G°)(3P°) 3 G

4/5d(3 F°)6s6p(3 P°) 3 14539.212 0.967 20 5G 20 (1 D°)( 3P°) 3 F

4/2( 3 H)5d ( 4 H)6s 4 14599.598 0.906 39 5 H 18 4/5d(3 G° )6s6p(3P° ) 5 H

4/5d(3 F°)6s6p(3 P°) 1 14635.243 0.407 44 s F 16 ( 3 F°)(3P°) 3 D

4/5d(3 F°)6s6p(3 P°) 2 14646.445 1.152 19 3 D 16 ( 3F'°)(3 P

°

) 5 F

4/2( 3 H)5d ( 4 K)6s 3 K 6 14743.626 67 10 ( 3 H)(4 K) 5 K

7 16067.587 1.051? 56 10 ( 3 H)( 4 K) 5 K

8 84 5 ( 3 H)(2 K) 3 K

4/5d( 1 G°)6s6p(3P°) 4 14748.945 0.992 19 3G 17 ( 3 H°)(3P°) 5 H

4/2

( 3 H)5d ( 4 I)6s 3

I 5 14795.290 53 11 ( 3 H)(2 H) 'H

4/5d(1 G°)6s6p(3P°)? 3 15063.452 0.849 16 3G 13 (3 F“)(3P°) 3G

4/5d(1 G°)6s6p(3P°) 4 15240.619 1.012 16 3G 14 ( 3 H°)(3P°) 5 H

4/2( 3 H)5d ( 2 F)6s? 3 15277.852 0.807 12 -F 10 ( 3 H)(2 F) 3 F

4/2

( 3 H)5d ( 4 H)6s 5 15339.718 1.076 32 5 H 11 4/5d(3G° )6s6p(3P° ) 5 H

4/5d(3 H°)6s6p(3P°) 4 15371.647 1.040 24 5 H 19 (

l G°)(3 P°) 3 F

4/2

( 3 H)5d ( 4 I)6s 6 15396.286 37 3

I 15 ( 3 H)(2

I) 3I 4/

(

2 FI/2 ) 6s2 6pi/2 3 15555.992 1.005 14 ( 5

/ 2)

t-M 8 4/2

( 3 H)5d ( 4 F)6s 5 F

4/5d(3 H°)6s6p(3P°) 5

I 5 15561.346 1.075 27 25 (1 G°)( 3 P°) 3G

4 15843.449 0.883 29 10 ( 3 H°)( 3P°) 3 H

6 17066.246 1.117 56 8 ( 3 H°)(3P°) 5 H

7 18027.669 1.179 76 4 4/(2 F°)5d2

( 3 F) ( 4 I°)6p 5

I 8 19567.423 1.246 93 5 4/(2 F°)5d2

( 3 F) ( 4 I°)6p 5

I

4/(2 Fi/2)6s2 6pi/2 2 15587.927 0.747 19 ( 5

/ 2,V2 ) 9 4/5d(3 G°)6s6p( 3P°) 5G

4/2

( 3 H)5d ( 2 F)6s 2 15607.981 0.839 21 3F 17 ( 3 H)(4 F) 5 F

4/5d( 1 G°)6s6p(3P°) 6 15644.943 1.171 36 3 H 15 ( 3 H°)(3 P°) 3 H

4/5d(3 F°)6s6p(3P°) 0 15649.774 37 5 D 23 (

1 D°)(3P°) 3 P

4/5d(3 F°)6s6p(3P°) 4 15700.978 1.062 15 5G 10 4/2

( 3 H)5d ( 4 G)6s 5 G

4/5d(3 F°)6s6p(3P°) 1 15751.949 1.013 26 5D 16 (

1 D°)(3P°) 3 P

4/5d(3 F°)6s6p(3 P°) 2 15758.458 0.550 19 5G 15 ( 3G°)(3 P°) 5G

4/2( 3 F)5d ( 4 H)6s? 3 15766.048 0.740 17 5 H 12 ( 3 H)(4 G) 5G

4/(2 F5/2)6s2 6pi/2 ? 3 15798.226 0.798 12 ( 5/2,V2) 11 4/5d( 1 G°)6s6p(3 P°) 3 F

4/5d(3 H°)6s6p(3 P°) 5 15879.778 0.952 16 5 H 13 ( 3 H°)(3P°) 5

I 4/5d(3 F°)6s6p( 3P°) 4 15945.111 0.987 25 5G 9 4/2

( 3 F)5d ( 4 H)6s 5 H

4/5d(3 F°)6s6p(3P°) 2 15967.087 0.901 23 5 F 11 ( 3G°)(3P°) 5G

4/5d(3 F°)6s6p(3 P°) 3 16008.831 1.220 36 s F 10 (3F°)(3 P°) 3 D

4/5d(3 H°)6s6p(3 P°) 5 16016.409 1.071 43 5 H 10 ( 3 H°)(3P°) ‘H

4/2

( 3 F)5d ( 4 H)6s 3 16017.358 0.863 25 5 H 9 ( 3 H)(4 G) 5G

4/2

( 3 H)5d ( 4 H)6s 4 16051.478 0.912 12 3 H 10 ( 3 H)(4 G) 5 G

4/2 6s2 2 16080.882 1.010 34 ‘D 19 4/5d(3 F°)6s6p(3P°) 5 F

4/5d(3 F°)6s6p(3P°) 3 16200.493 0.963 11 5G 11 ( 3G°)(3 P°) 5G
56

Ce I, Even Parity—Continued

Configuration Term J

Level (cm -1

) 9 Leading percentages

4/2

( 3 H)5d ( 2 I)6s 5 16223.643 0.977 27 3

I 13 4/5d(3 H°)6s6p(3 P°) *H

4/2

( 3 H)5d ( 4 H)6s 5 H 6 16249.601 1.190 56 11' 4/5d(3 G°)6s6p(3P°) 5 H

4/2

( 3 F)5d ( 4 H)6s 4 16338.704 0.967 20 5 H 8 ( 3 H)(4G) 5G

4f( 2 Fg,2 )6s2 6pi/2 2 16347.978 0.749 14 ( 5/2,V2) 10 4/5d(3G° )6s6p(3P° ) 5G

4/5d(3 F°)6s6p(3 P°) 3 16384.741 1.056 12 5 D 12 ( 3 F°)(3 P°) 5F

4/5d(3 F°)6s6p(3 P°) 2 16534.451 1.059 20 SD 10 4/2

( 3 F)5d ( 4 D)6s 5 D

4/2( 3 F)5d ( 2 P)6s 0 16546.418 21 3P 17 ( 3 F)(4 D) 5 D

4/5d( 1 G°)6s6p(3P°) 5 16586.423 1.065 27 3 H 21 ( 3 H

0

)( 3P°) 5

I 4/2

( 3 F)5d ( 4 H)6s? 4 16588.202 1.155 14 5 H 9 ( 3 H)(2 F) 3 F

4/2

( 3 F)5d ( 2 P)6s 1 16649.443 1.430 18 3P 12 4/5d( 1 D°)6s6p( 3P°) 3 P

4/5d(3G°)6s6p(3P°) 3 16668.190 0.867 22 5 H 13 ( 3G°)(3P°) 5G

4/2( 3 H)5d ( 4 G)6s? 4 16693.152 1.014 12 5G 10 4/5d(3G°)6s6p( 3P°) 5 H

4/5d(3 H°)6s6p(3P°) 6 16699.384 1.157 28 5H 17 (

1 G°)(3P°) 3 H

4/2( 3 H)5d ( 2 I)6s 6 16836.647 1.065 24 X I 23 ( 3 H)(4 I) 3I 4/2

( 3 H)5d ( 4 F)6s 2 16868.770 1.088 17 5F 9 ( 3H)(2 F) 3 F

4/2

( 3 F)5d ( 4 H)6s? 4 16869.253 0.991 6

5H 5 4/5d(3 H°)6s6p(3P°) 3 H

4/5d(3 F°)6s6p(3P°) 1 16873.700 0.616 29 3D 12 (‘D0 )^0

) 3P

4/5d(3 F°)6s6p(3 P°) 5 16903.380 1.185 14 5G 12 4/2

( 1 G)5d ( 2 H)6s 3 H

3 16921.980 0.950 4/5d(3 G°)6s6p(3P°)? 4 16942.526 0.981 14 5G 13 4/2

( 3 H)5d ( 4 H)6s 3 H

3 17051.642 1.040 4/5d(3 F°)6s6p(3P°)? 5 17075.107 1.087 21 5G 8 ( 3 H°)(3P°) X H

4/5d( 1 D°)6s6p(3P°) 2 17108.967 1.196 19 3P 16 ( 3 F° )( 3 P°) X D

4/5d(3 F°)6s6p(3 P°) 0 17109.992 33 5 D 15 ( 3D°)(3 P°) 3 P

4/2

( 3 F)5d ( 4 H)6s? 5 17120.402 1.095 37 5 H 12 4/( 2 F°)5d2

( 3 F) ( 4 H°)6p 5 H

4/2( 3 F)5d ( 4P)6s 1 17136.214 1.491 18 sp 17 4/5d(3 F°)6s6p(3 P°) 5 D

3 17146.308 0.864 4/5d(3 G°)6s6p(3P°)? 4 17147.538 1.026 16 5 H 9 ( 3F°)(3p° ) IQ

4/2( 3 H)5rf ( 4 H)6s 5 H 7 17167.681 50 19 ( 3 H)(4

I) 3I 4/2

( 3 H)5d ( 2 I)6s 6 17289.878 1.041 34 X I 18 ( 3 H)(2 I) 3

I 3 17302.943 1.030 4/5d(3 F°)6s6p(3P°) 4 17315.438 1.148 22 5 F 10 4/2

( 3 H)5d ( 4 H)6s 3 H

4/5d(3 F°)6s6p(3 P°) 5 17343.734 1.178 18 5G 10 ( 3G°)(3 P°) 3 G

4/5d(1 D°)6s6p(3P°) 4 17390.114 1.179 16 3 F 11 ( 3 F°)(3 P°) 5 F

4/2( 3 F)5d ( 4 P)6s 1 17391.859 1.830 29 sp 9 ( 3F)(4 F) 5 F

4/2( 3 F)5d ( 4 P)6s sp 2 17417.150 46 10 ( 3F)(2 P) 3 P

4/5d(3 F°)6s6p(3P°) 4 17438.566 1.232 30 5 F 7 4/2

( 3 H)5d ( 4 F)6s 5 F

3 17511.596 0.977 4/2

( 3 H)5d ( 4G)6s 5 17530.761 1.194 26 5G 15 4/5d(3 G°)6s6p(3P°) 5 G

4/5d(3 F°)6s6p(3P°) 4 17615.893 1.161 31 5 D 12 4/2

( 3 F)5d ( 4 D)6s 5 D

4/5d(3 H°)6s6p(3 P°) 6 17649.036 1.184 23 3 H 18 4/2

( 3 F)5d ( 4 H)6s 5 H

3 17654.418 1.078 4/2

( 3 F)5d ( 4 P)6s 1 17674.961 0.611 19 sp 17 ( 3 F)(4 F) 5 F

4/2( 3 F)5d ( 4 G)6s 2 17689.747 0.595 26 5G 22 4/5d(3 H°)6s6p(3P°) 5G
57

Ce I, Even Parity—Continued

Configuration Term J

Level

(era" 1 ) g Leading percentages

4

6s2 0 17700.798 20 3P 19 4/5d( 1 D°)6s6p(3 P°) 3P

4/5d(3 H°)6s6p(3 P°) 7 17708.707 1.206 28 5 H 16 4/2

( 3 F)5d ( 4 H)6s 5 H

4/5d(3 G°)6s6p(3 P°) 5 17729.875 1.222 16 5 H 9 4/2

( 3 H)5d ( 4 H)6s 3 H

4/5d(1 G°)6s6p(3 P°) 4 17731.228 1.110 10 3 H 6 4/2

( 3 F)5d ( 4 F)6s 5 F

4/5d( 1 P°)6s6p(3 P°) 2 17770.105 0.936 12 3 F 11 ( 3G°)(3P°) 3G

3 17785.937 1.147 4/2

( 3 F)5d ( 4 F)6s 2 17886.379 1.357 18 5 F 7 ( 3 F)(2 P) 3 P

4/2( 3 F)5d ( 4 H)6s 4 17892.814 0.917 27 3 H 12 4/(2 F°)5d2

( 3 F) (4 H°)6p 3 H

4/2

( 3 H)5d ( 4 H)6s 5 17895.539 1.087 23 3 H 7 4/5d(3 H°)6s6p(3P°) 5 H

3 17921.087 1.222 4/2

( 3 F)5d ( 4 H)6s 6 17975.060 1.207 22 5 H 14 (

X G)(2H) 3 H

4f( 2 F?/2)6s2 6pi/2? 4 17998.974 1.040 13 ( 7 /2,‘/2) 12 ( 5

/2,3/ 2 ) 3 18005.652 1.136 4/5d(3 H°)6s6p(3 P°) 5 18008.442 1.139 9

3

I 7 ( 3F°)( 3 P

0

) 5 F

4/2( 3 F)5d ( 4 F)6s 2 18052.690 0.978 13 5 F 8 ( 3 F)(4P) 5 P

4/5d( 1 D°)6s6p(3P°) 1 18066.931 0.719 19 3 D 12 4/2

( 3 F)5d ( 4 F)6s 5 F

4/2( 3 H)5d ( 2G)6s? 4 18141.848 1.075 9

X G 9 ( 3F)(2 F) 3 F

4/2

( 3 H)5d ( 4 F)6s 4 18162.311 1.161 15 s F 11 4/5d(3G°)6s6p(3P°) 5G

3 18192.766 1.087 4/5d(3 G°)6s6p(3P°) 5 18194.890 1.025 12 5 H 11 ( 3 H°)(3P°) >H

4/2 6s2

1 18201.970 1.302 19 3P 12 4/5d(3 D°)6s6p(3 P°) 5 D

4/2

( 3 F)5d ( 2 P)6s 1 18221.192 1.118 12 X P 12 4/5d(3 F°)6s6p(3P°) 5 D

4/2

( 3 H)5d ( 4 F)6s 2 18238.821 0.945 18 3F 8 4/5d(3 D°)6s6p(3P°) 5 F

4/5d(3 F°)6s6p(3P°) 6 18294.451 32 5G 10 ( 3 H°)(3P°) 3 H

4/5d(3 H°)6s6p(3P°) 7 18294.645 1.224 34 5H 16 4/2

( 3 H)5d ( 4 I)6s 3 I 3 18313.861 1.235

4/5d(3 F°)6s6p(3 P°) 2 18324.668 1.006 13 7 D 12 ( 3 F°)(3 P°) 3 D

4/5d(3 F°)6s6p(3P°) 5 18365.725 1.158 18 5 F 14 ( 3 H°)(3P°) 3 H

4/5<Z(3 F°)6s6p(3P°) 4 18411.170 1.175 12 3G 12 4/2

( 3 F)5d ( 4 F)6s S F

3 18427.612 4/2 6s2 1 18535.575 0.602 22 3P 18 4/5d(3 D°)6s6p(3P°) S F

4/2( 3 H)5d ( 2 G)6s 4 18550.101 1.055 15 3G 6 4/5d(3 G°)6s6p(3P°) X G

4/5d(3 F°)6s6p(3P°) 2 18587.749 1.135 12 5D 7 4/2

( 3 F)5d ( 4P)6s 3 P

4/5d(3 F°)6s6p(3P°) 6 18598.261 1.253 31 5G 17 ( 3G°)(3P°) 5 H

3 18611.386 1.028 4/5d(3 F°)6s6p(3P°) 5 18619.685 1.119 14 5 F 12 ( 3G°)(3 P°) 5 H

3 18652.242 1.137 4/2

( 3 H)5d ( 4 F)6s 5 18661.289 1.237 25 5 F 12 4/5d(3 F°)6s6p(3P°) 5 F

4/

(

2 FI/2)6s2 6p3/2 4 18692.793 1.110 11 ( 5

/2 3 /2) 7 ( 7

/2,3

/ 2 ) 4/2

( 3 H)5d ( 4 F)6s 2 18706.502 0.844 21 3 F 15 4/5d(3 F°)6s6p(3P°) 3 F

4/5d(3 G°)6s6p(3 P°)? 1 18727.755 0.625 13 5 F 12 4/2

( 3 F)5d ( 4 F)6s 5 F

3 18758.513 1.047 4/2

( 3 F)5d ( 4 G)6s? 5 18831.782 1.141 11 5G 9 4/5d(3G°)6s6p(3P°) 3G

4/5d(3 G°)6s6p(3 P°) 4 18871.606 1.100 9

3G 9 (3 F°)(3p° ) 3Q

225-298 O - 78 - 5
58

Ce I, Even Parity—Continued

Configuration Term J

Level (cm -1

) 9 Leading percentages

4/5d(1 D°)6s6p(3P°) 2 18880.662 0.934 14 3D 7 ( 3G°)(3 P°) 5 F

4/2

( 3 F)5a’ (4 H)6s 7 18942.478 1.257 39 5H 22 4/5d(3 H°)6s6p(3 P°) S H

4/2( 3 F)5d ( 4 H)6s? 5 18943.013 1.160 13 3H 5 ( 3 F)(4 F) 5 F

4/2

( 3 F)5d ( 2 P)6s? 1 18973.876 0.842 15 3P 12 ( 3 F)(2 P) X P

4/2( 3 F)5d ( 2 D)6s 2 18987.150 1.121 12 X D 9 ( 3 F)(2 D) 3 D

4/(2 F°)5d2( 3 F) ( 4 H°)6p 4 19014.863 0.911 26 5

I 15 4/2

( 3 F)5d ( 4 H)6s 3 H

4/5d(3 H°)6s6p(3P°) 5 19062.498 1.097 12 5G 11 4/2

( 3 F)5d ( 4 H)6s 3 H

4/2

( 3 H)5d ( 4 H)6s 6 19072.103 1.122 17 3 H 15 4/5d(3 H°)6s6p(3P°) 3

I

3 19072.898 1.009 4/2

( 3 F)5d ( 2 D)6s 2 19158.135 1.020 9

X D 9 4/5d( 1 D° )6s6p(3P° ) 3 D

4/5d(3G°)6s6p(3 P°) 4 19220.360 1.137 14 3G 6 4/2

( 3 F)5d ( 4 F)6s 5 F

4/5d(3 H°)6s6p(3P°) 6 19235.098 1.097 16 3

I 13 ( 3G°)(3P°) 5 H

4/2( 3 H)5d ( 2 G)6s 4 19244.787 1.000 13 X G 9 4/(2 F°)5d2

( 3F) ( 4 I°)6p 3 H

3 19247.627 1.067

4/(2 F°)5d2( 3 F) ( 4 I°)6p 4 19296.353 0.926 22 3 H 9 4/5d(3 H°)6s6p(1 P°) 3 H

2 19321.019 1.334 2 19330.215 0.961 4/5d(3 H°)6s6p(3 P°) 5 19347.064 1.198 18 SG 14 ( 3F°)(3P°) 3G

4/2( 3 H)5d ( 4 H)6s 6 19347.542 1.193 21 3H 9 ( 3 F)(4 H) 3 H

4/2 6s2 1 19362.490 1.392 15 3P 11 4/5d(3 D°)6s6p(3P°) 3P

3 19406.157 1.158

2 19409.898 0.922

3 19457.393 0.972 4/5d(3 D°)6s6p(3P°) 4 19544.105 1.187 12 sF 9 4/2

( 3 H)5d ( 4 F)6s S F

4/5d( 1 D°)6s6p(3P°)? 1 19566.861 0.836 18 3D 12 4/2

( 3F)5d ( 2 D)6s 3 D

2 19595.360 0.826 4/5d(3 G°)6s6p(3P°)? 6 19627.275 1.075 23 5 H 17 ( 3G°)(3 P°) 5G

3 19636.636 1.052

4/(2F°)5d2

( 3 F) ( 4 H°)6p? 5 19661.076 1.047 22 5

I 10 4/2( 3 F)5d ( 4 H)6s 3 H

4/2

( 3 F)5d ( 4 D)6s 4 19680.078 1.260 15 5D 10 4/5d( 1 G°)6s6p( 3P°) 3 F

4/2( 3 H)5d ( 2 K)6s? 3 K? 6 19680.343 1.06 45 7 ( 3 H)(4 H) 3 H

3 19711.008 0.946

4/5d(3 D°)6s6p(3P°)? 1 19768.832 0.813 9

X P 9 4/2

( 3 F)5d ( 4D)6s 3 D

4/( 2 F°)5d2

( 3 F) ( 4 I°)6p 5 K 5 19791.740 0.836 34 18 4/5d(3 H°)6s6p(3P°) 3

I 6 20591.937 0.961 51 11 ( 2 F°)( 3 F) ( 4 H°) 5

I 7 21654.060 1.053 66 5 ( 2F°)(3 F) ( 4 H°) 5

I 8 22864.055 1.164 59 26 ( 2F°)(3 F) ( 4H°) 5

I 9 24350.503 1.222 95 4 4/2

( 3 H)5d ( 4 K)6s 5 K

2 19805.290 1.244

4/2

( 3 H)5d ( 2 K)6s 7 19836.936 40 X K 30 ( 3 H)(2 K) 3 K

4/2( 3 F)5d ( 4 F)6s 4 19840.631 1.211 21 5F 5 ( 3F)(2G) X G

4/(2 F°)5d2

( 3 F) ( 4 I°)6p? 5 19843.704 1.008 15 5 K 10 4/2

(

x G)5d ( 2 H)6s 3 H

2 19880.707 0.779

3 19928.468 1.157

4/5d(3 P°)6s6p(3P°)? 1 19961.411 15 sP 10 ( 3D°)(3P°) 5P
59

Ce I, Even Parity—Continued

Configuration Term J

Level (cm -1

) 9 Leading percentages

3 19988.986 1.086 3 20030.979 0.950 4/2

( 3 F)5d ( 4 H)6s 6 20063.180 1.106 33 3 H 15 ( 3H)( 2 K) 3 K

4 20112.605 1.116 4/2

( 3 F)5d ( 4 P)6s? 1 20142.354 13 3P 10 ( 3 F)(4 D) 5 D

4 20174.457 0.879 2 20200.964 1.190 3 20242.186 1.017

3 20267.785 1.19 4/5d(3 G°)6s6p(3 P°) 5 20276.120 1.169 16 3G 16 4/(2 F?/2 )6s2 6p3/2 ( 7 /2,3

/ 2 ) 4 20320.040 1.137 4/5d(3G°)6s6p(3 P°) 5 20338.893 0.996 12 3H 12 4/(2 F°)5d2

( 3 F) ( 4 I°)6p 5 K

4/5d(3 H°)6s6p(3 P°) 6 20346.021 1.282 32 5G 19 4/2

( 3 F)5d ( 4G)6s 5 G

4/5d(3 P°)6s6p(3 P°) 1 20399.725 1.533 22 sp 10 ( 3P° ) ( 3 P°) 5 D

4 20411.394 1.088 3 20430.658 1.275 2 20430.829 1.216 4/5d(3 G°)6s6p(3P°) 5 H 7 20448.112 1.275 75 6 4/2

( 3 H)5d ( 4 H)6s 5 H

4/2( 3F)5d ( 4 F)6s 5 20498.515 1.212 28 5 F 10 4/(2 F°)5e£2

( 3F) ( 2G°)6p 3G

4/2 6s2 >1 6 20509.064 1.00 64 10 4/5d( 1 H° )6s6p( 1 P° )

l I

4 20509.805 1.163 2 20513.966 1.107 4/2

( 3 F)5d ( 4 D)6s 1 20562.159 16 3 D 10 ( 3 F)(2P) >P

3 20613.172 1.130 2 20624.376 0.889

4/(2 F°)5d2

( 3 F) ( 4 I°)6p 5 20631.804 1.016 13 3 H 10 ( 2F°)(3 F) ( 4 I°) 5 K

3 20661.129 0.885 2 20708.481 1.288 4/(2 F°)5d2

( 3 F) ( 4 I°)6p 5 20730.135 1.056 10 3 H 6 4/5d(3 H°)6s6p(3 P°) 3

I 4 20747.237 1.125 4 20765.312 1.103 3 20782.510 1.348

1 20791.875 1.230 4/5d(3 H°)6s6p(3P°) 3

I 7 20812.921 1.145 48 11 4/(2 F°)5d2

( 3 F) ( 4 I°)6p 3

I

4/(2 F°)5d2

( 3 F) ( 4 H°)6p 5I 6 20842.504 1.100 51 8 ( 2F°)(3 F) ( 4 I°) 5 K

7 22063.473 1.171 75 5 4/2

( 3 H)5d ( 4 I)6s 5

I 8 23282.722 1.233 60 32 ( 2 F°)(3 F) ( 4 F) 5 K

4 20907.116 1.148

2 20927.698 1.002 2 20962.608 0.996

4 20998.016 1.054 4/5d(3 D°)6s6p(3P°) 1 20998.840 1.209 36 5p 6 ( 3P°)(3 P°) 5 P

4/5d(3G°)6s6p(3P°) 1 21017.878 0.468 24 5 F 14 ( 3 D°)(3 P°) 5 F

1 2 21023.153 0.953
60

Ce I, Even Parity—Continued

Configuration Term J

Level

(cnr ‘) 9 Leading percentages

4/(2 F°)5d2

( 3 F) ( 4 H°)6p 5 21059.520 1.075 19 5

I 10 ( 2 F°)(3 F) ( 2 G°) 3 H

4/5d(3 D°)6s6p(3P°) 0 21068.470 18 3P 11 , ( 3P°)( 3 P

0

) 5 D

4 21076.477 0.949 4/(2 F°)5d2

( 3 F) ( 4 H°)6p 6 21100.065 1.069 11 3 H 9 4/2

(

1 G)5d ( 2 H)6s 3 H

4/5d(3 D°)6s6p(3P°) 5 21153.703 1.250 15 5F 12 ( 3G°)(3 P°) 5 F

3 21158.831 1.225 4 21161.192 0.700

4/(2 F°)5d2

( 3 F) ( 4 D°)6p 1 21165.259 0.85 17 5F 10 5rf3

( 4 F)6s 5 F

2 21168.987 1.128 4/5d(3 D°)6s6p(3 P°) 5 21226.361 1.134 14 S F 13 4/(2 F°)5d2

( 3 F) ( 2G°)6p 3 H

3 21237.916 1.010

4 21267.903 1.107 4/2

( 3 H)5d ( 2 K)6s 7 21314.996 1.014 32 >K 31 ( 3 H)(2 K) 3 K

4/5d(3 H°)6s6p(3 P°) 6 21324.736 1.043 21 ‘I 9 4/(2 F°)5d2

( 3 F) ( 4 I°)6p 3

I 3 21340.864 1.108 2 21375.475 0.950 3 21399.014 1.265

2 21420.772 1.114 4/2

(

1 G)5d ( 2 D)6s 1 21431.568 0.640 13 3 D 11 4/(2 F°)5d2

( 3 F) ( 4 F°)6p 3 D

4/5d(3 H°)6s6p(3 P°) 5 21456.528 1.200 21 5G 9 ( 3G°)(3P°) 5G

3 21499.915 1.153 4 21520.287 1.107 4/5d(3 H°)6s6p(3 P°) 5 21581.408 1.134 10 5G 7 4/(2 F°)5d2

( 3 F) ( 2 I°)6p 3

I 3 21582.401 1.148

4 21619.232 1.021 2 21623.269 1.503? 3 21661.537 0.843

4/(2 F°)5d2

( 3 F) ( 2 S°)6p 0 21664.821 41 3P 8 ( 2F°)(3 F) ( 4 P°) 3P

4/2(

1 G)5c? ( 2 I)6s 5 21683.722 0.934 9

3

I 8 ( 3 F)(4G) 3G

2 21712.611 1.395 4/2

( 3 H)5d ( 2 K)6s 3 K 8 21722.069 65 10 ( X I)(2 K) 3 K

4/(2 F°)5d2

( 3 F) ( 4 I°)6p 5

I 5 21725.348 0.997 45 8 ( 2 F°)(3 F) ( 2G°) 3 H

6 22321.098 1.057 41 5 ( 2 F°)(3 F) ( 2 I°) 3

I 7 23452.626 1.157 38 8 4/2

(

1 G)5d ( 2 I)6s 3

I 8 24657.245 1.238 70 11 4/2

( 3 H)5d2

( 3F) 5

I

4/(2 F°)5d2

(

1 D) ( 2 P°)6p 1 21725.865 1.337 10 3 S 7 ( 2F°)(3 F) ( 4 P°) 3 S

2 21786.764 1.186 3 21813.247 1.048 4/5d( 1 F°)6s6p( 3P°) 1 21823.516 0.653 17 3 D 11 4/2

(

1 G)5d ( 2 D)6s 3 D

4/(2 F°)5d2

( 3 F) ( 2G°)6p 6 21877.490 1.128 24 3 H 14 ( 2 F°)(3 F) ( 4 H°) 5

I 4 21885.546 1.156 5 21946.849 1.084 3 21948.875 1.099 4 21993.874 1.213 2 21994.428 1.45
61

Ce I, Even Parity—Continued

Configuration Term

1 J

Level (cm -1

) 9 Leading percentages

4 22063.708 1.156 4/5d(3 H°)6s6p(3P°) 6 22064.966 1.150 17 5G 16 4/(2 F°)5d2

( 3 F) ( 2G°)6p 3 H

2 22092.108 1.014 3 22127.392 1.087

4/(2 F°)5d2

( 3 F) ( 2 S°)6p 1 22162.504 0.806 11 3P 9 ( 2F°)(3 F) ( 4 F°) 5 F

2 22170.124 0.745

5 22184.376 1.092 3 22190.760 0.938

4 22210.585 1.082

2 22219.750 1.179

1 22246.080 1.322 3 22291.251 1.233

4 22325.164 1.106

5 22355.991 1.083 2 22360.158 1.165 4/5d(3 P°)6s6p(3 P°)? 1 22392.029 1.500 37 5D 19 ( 3D°)(3P°) 5 D

4/5d(3 H°)6s6p(3 P°) 6 22438.967 1.126 9

x i 7 ( 3 H°)(3P°) 5G

3 22477.386 0.990 4 22503.719 1.049

5 22518.695 1.080

2 22549.057 1.185

4/(2 F°)5d2

( 3 F) ( 4 I°)6p 6 22558.596 1.180 17 5

i 11 4/5d(3 H°)6s6p(3 P°) 5G

4/(2 F°)5d2

( 3 F) ( 2S°)6p? 1 22567.448 1.476 14 3p 8 ( 2F°)( X D) ( 2 P°) 3 S

3 22600.482 1.250 2 22660.085 0.955

4/(2 F°)5d2

( 3 F) ( 2 P°)6p 0 22678.015 14 X S 13 ( 2F°)(1 D) ( 2 P°) X S

3 22713.073 1.155 4/(2 F°)5d2

( 3 F) ( 4 I°)6p 7 22739.355 1.135 15 3I 13 4/2

(

x G)5d ( 2 I)6s 3

I 5 22740.645 1.093

4 22741.485 1.021 4 22781.169 1.156

2 22798.685 1.266 3 22844.779 1.036

4/(2 F°)5d2

( 3 F) ( 4 I°)6p 6 22851.015 1.141 28 3H 14 4/5d(3 H°)6s6p( x P°) 3 H

5 22882.755 1.147

4 22908.586 1.176

4/(2 F°)5d2( 3 F) ( 4 D°)6p 1 22933.990 0.488 17 5 F 7 ( 2F°)(3P) ( 4 D°) 5 F

4 22949.615 1.119

2 22970.284 0.890 3 22972.499 1.052

2 23049.867 0.953

5 23083.233 1.101

5 23117.060 1.087

3 23139.791 0.951
62

Ce I, Even Parity—Continued

Configuration Term J

Level (cm -1

) 9 Leading percentages

3 23154.693 0.696

4/(2 F°)5d2

( 3 F) ( 4 I°)6p 7 23184.096 1.151 27 5

I 17 ( 2 F°)(3 F) ( 2 I°) 3

I 4/(2 F°)5d2

( 3 F) ( 4 H°)6p 6 23190.384 1.169 38 5 H 8 4/5d( 1 H°)6s6p(3P° ) 3 H

3 23240.982 0.865 2 23244.973 0.993 4 23251.722 1.053 5 23292.136 0.975 4/5d( 1 F°)6s6p(3P°) 1 23299.807 1.527 6

3 D 6 4/(2 F°)5d2

( 3 F) ( 4 D°)6p 5 F

3 23301.906 1.272 4/(2 F°)5d2

( 3 F) ( 2 I°)6p 6 23370.168 1.034 13 ‘I 11 ( 2 F°)( 1 G) ( 2 I°) »I 4 23391.896 1.067 4/(2 F°)5d2

( 3 F) ( 4 D°)6p 0 23392.754 12 5 D 11 4/5d(3 P°)6s6p(3P°) 3 P

5 23430.776 1.293

4 23513.352 1.166 3 23535.757 1.011 4/5d(3 D°)6s6p(3 P°) 1 23554.940 0.519 9

3 D 7 4/(2 F°)5d2

(

1 D) ( 2P°)6p 3 D

4 23596.416 1.043 2 23620.200 1.047 6 23627.278 1.012

1 23673.890 1.604 3 23701.801 1.008 6 23709.980 0.943

4 23722.196 1.051 2 23725.770 1.088 3 23727.513 1.193 5 23749.896 1.148

4 23811.369 1.113 2 23860.329 0.962

2 23869.048 1.236

5 23885.162 1.16

1 23895.211 0.813

3 23909.764 1.186 6 23944.962 0.889

4/( 2 F°)5d2

( 3 F) ( 4 F°)6p 0 23951.456 26 5 D 12 4/5d(3 D°)6s6p( 1 P°) 3P

5 23962.481 1.196 4 23978.411 1.154 5 24009.430 1.074 2 24024.353 1.393 3 24041.686 1.133 2 24071.835 1.163 4/(2 F°)5d2

( 3 F) ( 4 D°)6p 1 24087.022 2.042 18 sP 11 4/2

( 3P)5d ( 4P)6s 5 P

3 24131.943 1.155 3 24135.490 1.195 4/(2 F°)5d2

( 3 F) ( 4 H°)6p 5 H 7 24148.194 1.216 51 10 4/2

(

1 G)5rf ( 2 I)6s 3

I
63

Ce I, Even Parity—Continued

Configuration Term J

Level (cm -1

) 9 Leading percentages

4 24159.701 1.103 6 24167.499 0.948 2 24193.407

4 24198.377 1.174

4 24214.433 1.146

5 24248.369 1.080

3 24274.908 1.192 5 24290.594 1.098

2 24294.652 0.941

1 24325.115 1.245

3 24352.787 0.863

4 24364.716 1.188

5 24412.448 1.067 2 24420.797 0.915 6 24427.862 1.129

2 24445.454 1.156 4/5d(3 P°)6s6p(3 P°)? 0 24466.163 11 3P 9 4/2

(

1 D)5d ( 2P)6s 3 P

5 24535.600 1.155

4 24549.787 0.947 6 24561.348 0.972 3 24562.175

3 24565.881 1.125 4/5d(3 P°)6s6p(3P°)? 0 24601.655 20 3P 18 4/2

(

1 D)5d ( 2P)6s 3 P

1 24609.938 1.252

4 24619.260 1.159

2 24660.675 0.936

2 24673.994

6 24691.'432 1.216

4 24697.323

2 24704.139 1.163 5 24715.417 1.189 3 24731.583 0.941

1,2 24789.209

2 24808.737 0.94

4/(2 F°)5d2

( 3 F) ( 2 I°)6p 7 24826.953 1.060 41 3 K 13 ( 2 F°)( 1 G) ( 2 I°) 3 K

5 24853.962 1.125 3 24859.809 1.219

4 24873.633 1.086 3 24883.143 1.042

1 24904.076

2 24934.358 1.265

1 24943.654 1.081

4 24960.288 0.947

1 24980.095
64

Ce I, Even Parity—Continued

Configuration Term J

Level (cm -1

) 9 Leading percentages

3 25044.233 0.997 6 25058.207 1.150

2 25059.621 1.113 4 25077.395 1.187

5 25093.105 1.146

3 25134.962 1.135

1 25174.542 1.906

1 25185.870 0.704

2 25193.242 1.578

4 25208.286 1.332

4/( 2 F°)5d2

( 3 F) ( 4 I°)6p? 7 25260.320 1.129 25 3 K 12 ( 2F°)(3 F) ( 2 H°) 3

I 5 25266.806 1.112

4/(2 F°)5d2

( 3 F) ( 4 D°)6p 0 25287.107 31 5 D 13 ( 2 F°)(3 F) ( 4 F°) 5 D

3 25297.222 1.225

4 25331.885 0.836

6 25344.548 1.126 2 25346.707 1.158

4 25365.812 0.941

1 25431.677 1.086

4/(2 F°)5d2

( 3 F) ( 4 H°)6p? 7 25434.458 1.086 26 3

I 14 ( 2F°)(3 F) ( 2 H°) 3I 5 25438.378 1.135 3 25441.048 1.399 2 25454.305 1.453

3 25492.072 0.956

6 25544.009 1.278 2 25567.838 0.909

1 25577.169

2 25635.648 1.311

3 25640.598 1.009 4 25668.215 1.069

5 25686.084 0.885

6 25730.382 1.179

3 25734.430 1.199

1 25740.465 1.319

4 25742.736 1.029

5 25774.246 1.11

6 25825.193 0.949

3 25854.290 1.09

4/(2 F°)5d2

( 3 F) ( 2 I°)6p 3 K 8 25859.876 1.144 55 11 ( 2 F°)( 1 G) ( 2 I°) 3 K

4 25863.180 1.042

5,6 25866.350

5 25868.082 1.057

2 25881.592

5 25928.289 0.931
65

Ce I, Even Parity—Continued

Configuration Term J

Level (cm -1

) 9 Leading percentages

4 25930.045 1.18 4 25958.129 1.024 2 25985.208 0.936 5 25987.414 1.066 4/(2 F°)5d2

( 3 F) ( 4 I°)6p 7 25990.573 1.191 20 5 H 17 ( 2 F°)(3 F) ( 4 I°) 3 K

1 26003.955 1.015 3 26010.601 0.687

4 26028.968 1.20 3 26050.442 1.404 5 26077.519 0.966 6 26107.128 1.137

2 26117.078

3 26129.632 0.990

1 26155.734 1.60 2 26160.350 1.51 4 26179.026 1.134 2 26209.390 1.446

1 26215.094 1.113 5 26226.051 0.951 5 26245.918 1.201 4 26297.430 1.216

3 26311.553

4 26351.090 1.05 3 26384.438 1.269

1 26402.895 1.835

6 26436.162 1.060 2 26449.158 1.232 4 26474.425

3 26498.929 1.20

1 26510.686

4/(2 F°)5d2

( 3 F) ( 4 I°)6p 7 26543.339 1.185 34 5 H 8 4/2

( 3 H)5d2

( 3F) 3K

4 26545.399 0.99 6 26586.690 1.10

5 26589.936 0.891 3 26610.277 1.144

5 26632.010 1.038

3 26658.643 0.978 6 26675.568

2 26690.185 1.144

5 26702.035 1.190 4/2

( 3 H)5d2( 3 F)? 7 26707.443 1.103 16 5 K 11 4/(2 F°)5d2

( 3 F) (4 I°)6p 3 K

4 26713.745 1.21 3 26714.323 1.248 4 26742.956 0.997

1 2 26786.991 0.775
66

Ce I, Even Parity—Continued

Configuration Term

r J

Level (cm ') 9 Leading percentages

6 26808.109 1.066 4 26836.434 1.217 3 26843.555

1 26853.642 1.605 6 26883.075

1 26913.605

4 26929.306 1.075

3 26934.381 1.270

2 26943.447 1.026 6 26972.051 1.186 2 27013.438 0.94

6 27038.349

6 27046.095

5 27059.164 0.989 2 27076.477

5 27079.267 1.129 4 27091.644 1.002

4,3 27103.499

4 27114.140 1.25

4 27159.064 0.83

3 27172.959

1 27183.504 1.456 3 27230.482

2 27254.752

4 27269.619

3 27269.831 0.855

4/(2 F°)5d2

( 3 F) ( 4 G°)6p 5 H 7 27271.854 1.239 54 8 4/2

(

1 I)5d ( 2 I)6s 3

I 6 27313.506 1.044 5 27323.672 1.278 2 27323.740

1 27334.124

2 27384.387 1.058

4 27394.344 1.20 5 27400.533 1.165

4 27419.445

3 27438.661 1.143

1 27474.071 0.537

4 27483.038

2 27488.295 4/2

( 3 H)5d2

( 3 F) 5

I 7 27499.170 44 22 ( 3F)(3 F) 5

I

2 27520.602

4 27539.493

5 27541.881 1.065

6 27551.129 1.138

3 27575.557 1.131
67

Ce I, Even Parity—Continued

Configuration Term J

Level (cm -1

) g Leading percentages

5 27594.029 0.883

1 27682.976 1.63 4/2

( 3 H)5d2

( 3 F) 8 27713.404 1.157 28 5 K 20 ( 3 H)(3 F) 5

I 3 27720.080

5 27722.717 1.078 2 27754.738 1.06

4 27777.471 4/2

( 3 H)5d2

( 3 F) 7 27790.306 1.082 41 5 K 12 4/(2 F°)5d2

( 3 F) ( 2 I°)6p *K

3 27801.418 0.789 4 27819.166

6 27831.875

2 27889.229 0.985

1 27927.770

4 27958.133

5 27961.103

3 27968.275

6 27993.692

4 28008.895

2 28027.579 4/2

( 3 H)5d2

( 3 F) 7 28035.167 1.06 15 3 K 14 4/(2 F°)5d2

( 3 F) ( 2 I°)6p X K

3 28061.678

4 28072.439

5 28081.659 1.15

1 28109.530

2 28110.643 1.21

3 28136.988 1.29 4 28162.787

4 28229.328

5 28248.773

4/(2 F°)5d2

( 3 F) ( 4 H°)6p 7 28278.254 28 3

I 12 ( 2 F°)(3 F) ( 2 H°) 3

I 3 28279.191

1 28318.481

2 28319.742

3 28323.546 1.149 4 28350.795

6 28353.870 1.076 0 28383.402

4 28391.572

1 28392.007

2 28398.232

2 28435.008

1 28449.566

6 28460.075

5 28463.492

1 4 28487.621
68

Ce I, Even Parity—Continued

Configuration Term J

' Level (cm 1 )

... 9* Leading percentages

3 28503.446 0.884 6 28540.983

3 28550.271

4 28552.406 4/2

( 3 H)5d2

( 3 P) 7 28557.829 14 3

I 13 ( 3 H)(3 F) 3

I

1 28560.398

5 28572.764

2,3 28585.170

5 28624.773

1 28630.090

3,4 28631.200

2 28637.803

4 28766.939 0.898

2 28776.759

6 28812.043 1.181

5 28818.644

4 28885.245

5 28900.623

4 28905.360 1.173

2 28918.763

3 28922.881

4,3 28970.469

2,3 28972.464

2,1 29013.879

6 29056.021

3 29066.231

4/(2 F°)5d2

(

1 G) ( 2 K°)6p 7 29068.385 27 3 L 15 4/2

(

1 I)5d ( 2 L)6s 3 L

4 29079.931

3 29102.000

2,3 29119.963

4,5,6 29164.578

4 29177.515

3 29213.489

4 29218.849

6 29252.803

1 29283.340

3,4 29283.952

3 29290.199

1 29322.493

2 29326.078

4 29330.295

6 29330.352

3,4 29331.059

5,6 29341.611

2 29380.730
69

Ce I, Even Parity—Continued

Configuration Term J

Level (cm" 1

) g Leading percentages

2 29404.276

3,4 29421.697

5 29442.990

2 29443.725

4/(2F°)5d2

(

1 G) ( 2 K°)6p 7 29451.510 23 3L 22 4/2

( 3 H)5d2(

1 G) 3 L

1 29452.104

4 29454.950 0.95

7 29467.837 1.111

1 29488.484

3,4 29493.486

6 29503.337

2,1 29527.513

2 29536.625

5,4 29570.267

4,3 29612.061

5 29613.602 1.228 6 29625.206 1.227

2,3 29646.559

5 29657.504

4,3 29667.999

1 29669.252

3,4 29678.177

7 29708.948

3,4 29717.715

2 29722.053

1 29751.194

4 29759.552

5 29766.188

6 29780.904

3 29798.291

2,3 29813.168

4 29821.757

5 29871.798

7 29877.112

3,2 29884.660

2 29903.166

4 29914.670

3 29946.815

5 29950.307

0,1 29956.305

2 29957.083

4 29999.887

6 30022.492 1.103

Ce II ( 4 H?/a) Limit 44672

V
70

Ce II

(La i sequence; 57 electrons) Z~58

Ground state (ls 2 2s 2 2pfi 3s 2 3pfi 3d 10 4s 2 4pfi 4d 10 5s 2 5p6

) 4/5d

2 4 H

o

7/2

Ionization energy 87500± 600 cm -1 10.85± 0.08 eV

Identified odd configurations 4/5d2

, 4/5d6s, 4/6s2

, 4/ 2 6p, 4/ 3

Identified even configurations 4/ 2 6s, 4/ 2 5d, 4/5d6p, 5d'\ 4/6s6p, 5

d

2 6s, 5d6s 2 ?

The preliminary analysis of this spectrum by Albertson and Harrison in 1937 gave a scheme of 31 lower and 51 upper energy levels classifying 584 lines. The basic methods of the

analysis —searching a list of the most accurate obtainable wavelengths for repeating

wavenumber differences by automatic techniques, and using Zeeman data to confirm, develop,

and interpret the level scheme —were successfully applied to several other spectra during this period at MIT, and more recently the modern version of this method became the standard

approach to analyses of the most complex and featureless atomic spectra. Such spectra are generally observed for atomic species having a large number of very low energy levels. Albertson and Harrison noted in this connection that for Ce II they had found “more than two

dozen low energy levels within 6000 cm -1 of the lowest.” (In fact Ce II has 46 levels below 6000

cm' 1 .) They suggested correctly that the low levels belonged to the 4/5d6s and 4/5d2 configurations.

This interpretation was confirmed by Harrison, Albertson, and Hosford [1941], who

extended the original system of energy levels and also found a second, unconnected system of

levels based on the lowest even configurations, 4/ 2 6s and 4/ 2 5d. The 39 low levels of this second system were given configuration and term designations, as were the 40 high odd (4/

2 6p

and 4/ 3

) levels. Term names were also assigned for many of the levels of the first system.

Some 3600 of the approximately 7000 lines in their unpublished list (2512-7000 A) were

classified by a total of 316 levels. Zeeman measurements for 427 lines gave g (and J) values for 280 of these levels. (This analysis and the data on which it was based superseded results

reported in the three 1939 papers by, respectively, Gerasimov, Tsien, and van de Vliet; only

the last of these was known to Harrison, Albertson, and Hosford.) Albertson worked

intermittently on the analysis until 1949 and added designations for many of the levels. G. Racah began calculations for Ce n at the Hebrew University in the 1950’s, and in 1955

he found the connection between the two systems of levels. An extraordinarily complete

theoretical interpretation of Ce n has resulted from Z. Goldschmidt’s continuation of this work. Her 1968 thesis included all seven even configurations, with their interactions, in one

calculation, and also gave her results for the four odd configurations 4/ 2 6p and (4/5d 2 +

4/5(Z6s+4/6s 2

). Working with Albertson’s unpublished line list, Goldschmidt also found some 50

real new levels and revised portions of the analysis.

Beginning in 1970, Corliss used new measurements of Ce n made at NBS to further

extend the analysis [Corliss, 1973]. He assigned a number of levels to the 4f

3 configuration and

also found many of the missing levels of configurations that had been calculated by

Goldschmidt. In 1971-72, Corliss and Goldschmidt again extended and revised the analysis,

making use of Goldschmidt’s new calculations for the levels of both parities.

The levels are from Corliss’s paper, which lists 192 odd and 288 even levels classifying

about 7500 lines. He gives a total of about 11000 lines in the range 2512 A to 2.423 pan, with

most of the wavelengths below 3300 A being taken from Albertson’s list. The wavelengths

longer than 1.1 /u.m were taken from the 1972 list of Verges et al. Corliss notes that the

strongest Ce II lines lie between 3800 and 4200 A, and arise from the transition arrays (4/5d2 +

4/5d6s)—4/5d6p, and 4/ 2 6s —4/

2 6p.

The eigenvector percentages are from Goldschmidt’s [1972] calculations. Every known

level of a particular parity was assigned to an eigenvector from a calculation that included all
Ce II—Continued 71

known configurations of that parity. All configuration interactions and appropriate effective

interactions were included [Goldschmidt, 1973].

The arrangement of the levels here results in a number of almost meaningless

designations (in order to complete certain terms), but no name is assigned that is clearly less appropriate than an alternate name. The ionization energy is from Sugar and Reader.

More than 150 lines of Ce II have been identified in the solar spectrum [Moore, Minnaert,

and Houtgast, 1966], Ce being one of the most abundant rare-earth elements in the sun

[Grevesse and Blanquet, 1969].

References

Albertson, W. E., and Harrison, G. R., Phys. Rev. 52, 1209 (1937). EL CL W

Albertson, W. E., unpublished material (1949, 1955). EL CL W ZE

Corliss, C. H„ J. Res. Nat. Bur. Stand. (U.S.) 77A, 419 (1973). EL ND CL W PT

Gerasimov, F. M., Zh. Eksp. Teor. Fiz., 9, 1036 (1939). ZE

Goldschmidt, Z. B., Thesis, Hebrew Univ. Jerusalem, Israel, 487 pp. (1968). ND CL PT

Goldschmidt, Z. B., unpublished calculations (1972). ND PT

Goldschmidt, Z. B., Atomic Physics 3, S. J. Smith and G. K. Walters, Eds., pp. 221-246 (Plenum Press, New York,

1973). ND PT

Grevesse, N., and Blanquet, G., Sol. Phys. 8, 5 (1969). Harrison, G. R., Albertson, W. E., and Hosford, N. F., J. Opt. Soc. Am. 31, 439 (1941). EL CL W ZE

Kiess, C. C., Hopkins, B. S., and Kremers, H. C., Sci. Papers Bur. Stand. 17, 317 (1921). W

King, A. S., Astrophys. J. 68, 194 (1928). W

Moore, C. E., Minnaert, M. G. J., and Houtgast, J., Nat. Bur. Stand. (U.S.), Monogr. 61, 349 pp. (1966). Racah, G., Bull. Res. Council Israel 5A, 78 (1955). EL

Sugar, J., and Reader, J., J. Opt. Soc. Am. 5, 1286 (1965). IP

Tsien, Wei-Zang, Chinese J. Phys. 3, 89 (1939). EL CL ZE

van de Vliet, H. J., Thesis, Zeeman Lab., Amsterdam, 85 pp. (1939). ZE

Verges, J., Corliss, C. H., and Martin, W. C., J. Res. Nat. Bur. Stand. (U.S.) 76A, 285 (1972). CL W

[July 1976]

Ce II, Odd Parity

Configuration Term J

Level (cm -1

) 9 Leading percentages

4/( 2 F°)5d2

( 3 F) 4 H° ? /2 0.000 0.794 48 35 ( 2 F°)(3 F) 2G°

9h 2581 1257 1.023 35 21 ( 2F°)(3 F) 2G°

ll/2 2879.695 1.123 92 2 ( 2F°)(1 D) 2 H°

13/ 2 A203.93A 1.189 69 29 ( 2 F°x3 F) 4 r

4/(2 F°)5d2

( 3 F) 9

/

987.611 0.948 30 4 J° 24 ( 2F°)(3 F) 2G°

4/(2 F°)5d2

( 3 F) 4 F 9

1 2 1U10.30U 0.856 49 22 ( 2 F°)(3 F) 4 H°

n/2 25637233 0.968 94 2 ( 2F°)( 1 D) 2 H°

is

/ 2 3 793.63

1.128 68 24 ( 2 F°)(3 F) 4 H°

! 5/2 5A55.8A5 1.196 99

4/(2 F°)5d2

( 3 F) 7

/

1873.93

0.806 43 4H° 18 ( 2 F°)(3F) 2G°

4/(2 F°)5d2

( 3 F) V2 21A0.A92 0.985 26 2 S° 23 (2F°)( 1 D) 2 P°

4/5d(1 G°)6s 9

1 2 23822A6 1.039 33 2G° 18 4/(2 F°)5d2

( 3 F) 4 H°

4/5d(3 F°)6s 4p° 3/2 2595.6AA 0.516 72 21 (1 D°) 2 D

»

S /2 3363.A27 0.995 43 18 4/(2 F°)5d2

( 3 F) 2 F°

7 /2 AA59.872 1.134 57 10 4/(2 F°)5d2

(

1 D) 2G°

9

1 2 5675.763 1.241 71 16 ( 3G°) 4G°

4/5d(3 F°)6s 5

/

263A-666 0.957 26 2 F° 21 4/(2 F°)5d2

(

1 D) 2 F°

4/5d(1 G°)6s 7

/

26A1.559 0.829 44 2G° 29 ( 3 H°) 4 H°

4/(2 F°)5d2

( 3 F) 2 S° V2 3508.A70 1.262 52 27 (2 F°)(3 F) 4 D°
72

Ce II, Odd Parity—Continued

Configuration Term J

Level (cm -1

) 9 Leading percentages

4/5d(1 G°)6s 9

/2 3593.882 0.988 26 2G° 25 4/(2 F°)5d2

(

1 D) 2 H°

4/(2 F°)5d2

( 3 F) 7 /2 3703.594 1.085 20 2p° 16 ( 2 F°)(3 F) 2G°

4/(2 F°)5d2

( 3 F) 4 D° 3 /2 3745.475 1.240 58 16 ( 2F°)(3 P) 4 D

°

4/5d(3 H°)6s 4 H° 7 /2 3995.460 0.879 51 18 (3 F°) 4p°

9

/2 4523.033 0.978 84 4 4/(2 F°)5d2

(

1 D) 2 H°

"/2 5651.357 1.085 49 15 4/( 2 F°)5d2

( 3 F) 2 I°

13

/ 2 6913.392 1.217 95 2 4/(2 F°)5d2

( 3 F) 2 I°

4/(2 F°)5d2

( 3 F) 4p° 3

/

2

4201.893 0.528 54 15 ( 2F°)(*D) 2 D°

5

/

2

5010.870 1.038 80 7 ( 2F°)( 3 P) 4 p°

7 /2 5964.896 1.332 45 29 ( 2 F°)(3 F) 4 D°

9

/

2

7059.072 1.222 53 9 ( 2F°)(3 F) 4 G°

4/5d(3 G°)6s 7

/

2

4266.397 0.964 27 2G° 26 ( 3G°) 4 G°

4/5d(3 G°)6s 5

/

2

4322.708 0.766 30 4G° 28 4/(2 F°)5d2

( 3 F) 4G°

4/5d(3 G°)6s 4 G° S/2 45117257 0.731 63 10 (3p°) 4p°

4/(2 F°)5d2

( 3 F) 5

/2 4737.373 1.021 41 4 D° 33 ( 2 F°)(3 F) 4 G°

4/(2 F°)5d2

( 3 F) 3

/2 4844.644 0.699 29 4p° 25 4/5d( 1 D°)6s 2 D°

4/5d(3 H°)6s 11

/ 2 4910.963 1.095 32 4 H° 26 ( 3 H°) 2 H°

4/5d( 1 D°)6s S

/2 5118.806 1.152 43 2 D° 17 4/(2 F°)5d2

( 3 F) 4 D°

4/(2 F°)5d2

(

, D) V2 5283.029 0.566 34 2P° 31 ( 2 F°)(3 F) 4 D°

4/(2 F°)5d2

( 3 F) 4 G° 7

/

2

5437.422 0.999 54 23 4/5d(3G°)6s 4G°

9

/

2

6389.942 1.154 66 19 n/2 7522.622 1.248 78 16

4/(2 F°)5d2

( 3 F) 7

/

2

5716216 1.009 37 4G° 34 4/5d(3G°)6s 4G°

4/5d(3 G°)6s 9

/

2

5819.113 1.189 26 4G° 21 4/(2 F°)5d2

(

1 D) 2G°

4/(2 F°)5d2

( 3 F) 3

/

2

5924204 1.241 26 2p° 25 ( 2 F°)(»D) 2P°

4/(2 F°)5d2( 3 F) 7/2 5942.798 1.145 26 4p° 22 ( 2F°)(3 F) 4 D°

4/(2 F°)5d2(

1 G) 11/2 5969.007 0.954 32 2 r 30 ( 2p°)(3p ) 2JO

4/5d(3 F°)6s S

/2 6517.619 0.954 14 2p° 14 ( 3 D°) 2 D°

4/5d(3 D°)6s 3

/

2

6521.332 0.924 28 2 D° 27 ( 3 D°) 4 D°

4/5d(3 F°)6s 5

/2 6549.908 20 2 F

o 15 (>D°) 2 D°

4/(2 F°)5d2( 3 F) 9

/

2

6638258 1.215 27 4p° 26 4/5d(3G°)6s 4G°

4/5d(3 D°)6s 4 D° V2 7061.838 95 2 (ip°\ 2p°

3

/

2

7818.147 1.099 67 14 (1 D°) 2 D

<=

5/2 81 75.863 1.271 75 7

(X F°) 2p°

7

/

2

8402.668 1.343 69 13 (1 F°) 2p°

4/(2 F°)5d2

( 3 P) 4 G° 5/2 7202.529 1.106 91 3 4/5d(3 F°)6s 2 F°

7 /2 7878.328 1.195 83 5 4/5d(3 G°)6s 2G°

9

/

2

8804224 1.160 69 9 4/5d(3G°)6s 2 G°

X1

/

2

10035.711 93 2 4/5d(3 H°)6s 2 H°

4/5d(3 G°)6s 4G° ll/2 7233.627 1.266 80 14 4/(2 F°)5d2

( 3 F) 4G°

4/5d(3 F°)6s 7

/

2

7259.075 1.140 39 2F

° 18 4/(2 F°)5d2

( 3 F) 2 F°
73

Ce II, Odd Parity—Continued

Configuration Term J

Level (cm -1

) 9 Leading percentages

4/(2 F°)5d2

( 3 F) 4 P° 3

/2 7278.922 85 6 ( 2 F°)(3 F) 2 P° V2 7522458 84 12 ( 2 F°)(3 F) 2 S°

5 /2 77U6.185 77 7 4/5d(3 D°)6s 2 D°

4/(2 F°)5d2

( 3 F) 2 I° l 3

/

7293.938 1.100 48 37 ( 2f°)( i g) 2 r

4/(2 F°)5d2

(

x G) 9

/2 7713.089 0.950 28 2 H° 26 ( 2 F°)(3 F) 2 H°

4/(2 F°)5d2

( 3 F) 4 S° 3

/2 8169.698 66 14 (2F°)( 1 D) 2 P°

4/(2 F°)5d2

( 3 P) 2 D° 5h 8280.9U6 1.189 48 7 ( 2 F°)(3 F) 4 D°

3

/ 2 87024U 50 11 ( 2 F°)(3 F) 2 D°

4/5d(3 H°)6s 11 h 8927.5

1.071 36 2 H° 31 4/(2 F°)5d2

( 3 F) 2 H°

4/(2 F°)5d2

(

x G) 2G° 7 /2 9198.326 64 16 ( 2 F°)(3 P) 2G°

4/(2 F°)5d2

( 3 P) V2 9269.826 41 4 D° 35 ( 2 F°)(3 F) 2P°

4/5d(3 P°)6s 4 P

C V2 9U91493 97 1 (i P°) 2 P°

3

i 2 963U-186 1.690 87 4 (ip°) 2p=

S/2 106U1 4h2 1.526 86 3 4/(2 F°)5d2

( 3 P) 4 D°

4/(2 F°)5d2

(

x G) 9

/2 9723.335 1.348 29 2G° 18 ( 2F°)(3 P) 4QO

4/(2 F°)6s2

2 F° 5

/ 2 9778.986 73 13 4/(2 F°)5d2

( x S) 2 F°

4/(2 F°)5d2

( 3 F) 3

/ 2 10088.623 2p° 17 ( 2F°)(3 P) 4 D

o

4/5d( 1 F°)6s 2 F° 5

/ 2 101 U,883 0.938 54 8 4/( 2 F°)5d2

( 1 D) 2 F°

7 /2 10271^.971 1.195 52 22 ( 3D°) 4 D°

4/(2 F°)5d2

( 3 P) 3

/2 10454272 31 4 D° 19 ( 2 F°)(3P) 4 F°

4/(2 F°)5d2

( 3P) V2 10684441 36 4D° 29 ( 2 F

°

)( 3 F) 2P°

4/(2 F°)5d2

( 3P) S

/2 10798.555 0.971 37 4 D° 27 ( 2 F°)(3P) 4 F°

4/(2 F°)5d2

(

x G) 2 H° 9

/ 2 10924-876 44 22 ( 2 F°)( X G) 2G°

“/2 11742245 1.081 51 20 4/5d( x H°)6s 2 H°

4/(2 F°)5d2

( 3P) 4p° 3

/ 2 11007.799 58 12 ( 2 F°)(3 P) 4 D°

3

/ 2 11325.781 55 19 ( 2F°)(3 P) 4 D°

7

/ 2 11340.598 1.123 38 12 4/5d(3G°)6s 2G°

9

/ 2 12762.641 1.275 65 9 4/5d(3G°)6s 2G°

4/(2 F°)5d2

( 3 P) 4 D° 7 /2 11387.731 60 17 ( 2F°)(3 F) 4 D°

4/5d(3G°)6s 7

/ 2 11949.189 1.029 22 2G° 19 4/(2 F°)5d2

(

x D) 2G°

4/(2 F°)5d2

( 3 F) 2D° S

/2 12057.107 47 17 ( 2 F°)( X G) 2 F°

3

/ 2 12466.430 59 18 ( 2 F°)(3 P) 2 D°

4/(2 F°)6s2 7

/ 2 12260.088 1.168 42 2p° 35 4/(2 F°)5d2

( 3 P) 4 F°

4/(2 F°)5d2

(

x G) 2 K° 18/2 12326417 97 2 ( 2 F

0

)( 3 F) 2 I°

15

/2 1440440 99 1 4/3 2 K°

4/(2 F°)5d2

( 3 F) 2 H° 9

/ 2 12365.806 0.921 46 23 4/5d( x H°)6s 2 H°

4/(2 F°)5d2

( 3 F) “/2 12751.782 33 2 H° 23 4/5d( x H°)6s 2 H°

4/(2 F°)5d2

(

1 G) 2p° 5

/2 13012.095 44 14 ( 2 F°)(3 F) 2 D°

7

/ 2 13515.853 73 9 ( 2F°)(3 F) 2 F°

4/(2 F°)5d2

( 3 P) 9

/ 2 13659.329 23 4p° 23 4/5d(3 G°)6s 2G°

225-298 0 - 78 -6
74

Ce II, Odd Parity—Continued

Configuration Term J

Level (cm -1

) 9 Leading percentages

4/5d(3 D°)6s 2 D

° 3

/2 13758.670 45 33 4/(2F°)5d2

(

1 D) 2 D°

4/5d(3 P°)6s 3

/ 2 1378U-83U 37 2 P

° 36 (

1 P°) 2P

°

4/5d(3 P°)6s 2 P° V2 U315.932 62 18 (i P°) 2 P°

4/(2 F°)5d2

(

1 D) S/2 11,481.930 29 2F

° 14 PF'WG) 2 F°

4/(2 F°)5d2

(

1 G) n/2 14963.100 41 2J

° 39 ( 2 F°)(3 F) 2 I° 4/(2 F°)5d2

(

1 G) 2J

° 1S/2 15517.772 56 42 t 2 F°)(3 F) 2 I° 4/5d(3 D°)6s 5/2 15565.420 26 2 D

° 20 4/(2 F°)5d2

(

1 G) 2 D°

4/(2 F°)5d2

(

1 D) 7

/ 2 16159.536 42 2F

° 14 4/5d(3 F°)6s 2F°

4/5d(1 H°)6s 2 H° 9

/2 16192.466 62 20 4/(2 F°)5d2

(

1 D) 2 H°

“/2 17171245 45 29

4/(2 F°)5d2

( 3 P) 7/2 17300.310 41 2G° 18 ( 2F°)( 1 D) 2G°

4/(2 F°)5d2

( 3 P) 9

/ 2 17475.023 38 2G° 28 ( 2F°)( 1 D) 2G°

4/5d(1 P°)6s 2P° l h 17851.80 74 12 4/(2F°)5d2

(

1 D) 2P°

3 h 19138.534 42 21 4/(2 F°)5d2

(

1 G) 2P°

4/(2 F°)5d2

(

1 G) 2 D° 3/2 65 13 (2 F°)(iG) 2P°

5

/2 18147.005 55 17 (2F

0 )(

X D) 2 D°

4/(2 F°)5d2

( 3 P) 2 F° S/2 19136.024 54 15 ( 2F°)( 1 S) 2 F°

7 /2 19920.813 62 11 ( 2F°)(3 F) 2 F

0

4/(2 F°)5d2

(

1 G) 2 p° 3

/

2

19946.568 59 13 4/5d( 1 P°)6s 2P° V2 95 1 (2F

°

)(3 F) 2p°

4/2( 3 H4 )6pi/ 2 (V/2)

0 9

/

2

25766255 0.799 95 4 ( jG4 ) (4,

l

/ 2

)°

7

/ 2 26268203 0.712 75 19 ( 3 H4 ) (4,8/2)°

4/2

( 3 Hs)6px/ 2 (5,V2

)° 11/2 27378.515 1.005 87 11 ( 3H4 ) (4,8/2)°

9/2 27975.619 0.933 51 34

4/2

( 3 H4 )6p3/2 (4

,

3

/ 2

)° 9

/ 2 27432.782 0.941 62 31 ( 3 Hs) (5,V2)° u/2 28327.071 1.036 64 26 ( 3 H5 ) (5,

3

/ 2

)°

7

/

2

28349.582 0.900 71 15 ( 3 H4) (4,

1 / 2

)° 5

/2 28396.150 0.594 65 27 ( 3 F2 ) (2,

x /2)°

4/2

( 3 H6 )6p!/2 (6,V2)° 18/2 29043.854 1.130 70 27 ( 3 H5 ) (5,

3

/ 2

)° u/2 29263.338 1.107 62 14

4/2( 3 H5 )6p3/2 (5 3

/ 2

)° 13 /2 29591.873 1.158 64 19 ( 3 He) ( 6, 8

/ 2

)° 9

/

2

29735.413 1.112 78 11 ( 3 Hs) (5, x /2)° “/

2

29750.547 1.019 58 22 ( 3 He) ( 6,V2

)°

7

/ 2 29892.677 0.940 46 45 ( 3 Fs) (3, x /2)°

4/2

( 3 F2 )6pi/ 2 (2,‘/2)° 5/2 29948.914 0.612 65 29 ( 3 H4 ) (4,8/2)°

3

/

2

30120.406 0.677 95 2 OD2 ) ( 2,>/2

)°

4/2

( 3 F4 )6pi/2 (4.V2) 0 9

/2 30669.702 1.110 53 27 (

x G4 ) (4,

x /2)°

7 /2 31344-828 52 34

4/2

( 3 H6 )6p3/2 ( 6, 3

/ 2

)° 15

/ 2 30846.582 1.205 100 “/2 31151.534 1.210 74 13 ( 3 F4 ) ( 4, 8

/ 2

)°

18/ 2 31340.393 1.110 77 12 ( 3 He) (e,

1 ^)

0

9

/ 2 32372.621 1.104 48 33 ( 3F3 ) (3,8/2)°

4/2

( 3 F3)6pi/2 (3,V2)° 3

/ 2 31024-076 95 1 ( 3F3) (3,8/2)°
75

Ce II, Odd Parity—Continued

Configuration Term J

Level (cm -1

) 9 Leading percentages

4/2( 3 Hs)6p3/2 7

/ 2 31130.983 0.975 37 (5

3

/2

)° 33 ( 3Fa) (3,V2)°

4/2( 3 F2 )6p3/2 (2,

3

/ 2

)° 31613.833 95 2 0D2) (2,

3

/ 2

)° 3/2 31747243 0.860 95 2 (*D2 ) (2,

3

/2

)°

5

/

31966.71,8 1.015 87 8 ( 3 F3 ) (3,

3

/ 2

)°

7

/

32235£39 1.111 52 15 ( 3 F3 ) (3,V2

)°

4/2( 3 F3 )6p3/2 (3,

3

/ 2

)° 9

/2 32616.019 47 28 0G4) (4,Va)°

3h 32826.668 95 1 4/5d(3 D°)6s 2 D°

S

/2 32885.367 1.102 47 28 ( 3 F4 ) (4,

3

/2

)°

7 /2 32989218 1.10 46 22 (

7 G4 ) (4,V2)°

4/2( 3 F4)6p3/2 (4,

3

/ 2

)° U/2 32864278 52 29 (*G4 ) (4 3

/ 2

)°

4/2( 3 F4 )6p3/2 9

/2 33040.353 1.106 36 (4,

3

/2

)° 34 OG4) (4,8/2)°

4/2( 3 F4)6p3/2 7

/33111.163 1.086 29 (4,

3

/2

)° 27 ( 3F3 ) (3,

3

/ 2

)°

4/2(

1 G4 )6pl /2 7/2 33535.636 0.966 31 (4,

1 / 2

)° 23 ( 3F4 ) (4,V2)°

4/2( 3 F3 )6p3/2 5

/2 33594-152 41 (3,3

/2

)° 34 ( 3 F4 ) (4,

3

/2)

0

4/2

( 3 F4)6pi/2 9

/

33908.193 1.11 30 (4,V2)° 21 (*G4 ) (4,

3

/ 2

)°

4/2

(

1 G4)6p3/2 (4,3

/ 2

)° “/2 34861.526 63 34 ( 3 F4 ) (4,8/2)°

4/2( 3 F4 )6p3/2 (4,

3

/ 2

)° 9

/35026.944 1.142 50 41 (>G4 ) (4,8/2)°

4/2(

1 G4)6p3/2 (4 3

/2

)° 5/2 35298.190 59 32 ( 3F4 ) (4,

3

/ 2

)°

4/2

( 3 F4 )6p3/2 7 /2 35625.700 0.923 48 (4 3

/2

)° 46 (‘G4) (4,

3

/ 2

)°

4/3 4 I° 9

/38194.728 0.720 97 2

2 H°2

11 h 39079298 0.964 99 1 2 H°2

18/2 40039.524 1.104 99

15/2 41058.614 1.197 99 1 2 K°

4/2(

1 D2)6pi/2 (2,

1 /*)

0 3

/2 38661.520 82 7 ( 3P2 ) (2,V2)°

5 /2 38835.734 83 7

4/2(>D2 )6p3/2 (2

,

3

/ 2 )° l /2 82 9 ( 3P2) (2,

3 /2)°

7

/40475.925 88 7

3

/

40720.122 79 7

S

/2 41100.932 89 5

4/2( 3Pi)6pi/2 3

/42533.459 42 (1,V2)° 22 ( 3P2 ) (2,

1

/2

)°

4/2

(

1 Ie)6pi/2 (6,Va

)° 13/2 42712.810 79 21 (Ge) (6,8/2)° n/2 42729.447 69 30

4/2( 3Po)6p3/2 (0,

3

/ 2

)° 3

/

44423.575 69 24 (8P2) (2,V2)°

4/2(‘I 6 )6p3/2 (6,8/2)° 13/2 44637.548 79 20 (Ge) (6,V2)°

15/2 45443.86 99 n/ 2 45864.950 59 24 (Ge) (6,V2)°

9

/46697.084 89 4 4/8 2 H°2

4/3 4 p

° 3

/ 2 44651.303 62 25 4/2

( 3 Pi)6p3/2 (1,8/2)°

5

/ 2 45130.529 97 2

2 D°1

7 /2 45598.301 92 4

2G°1

9

/2 46162.692 77 9

2 H°2

4/

2

( 3 p2 )6p3,2 (2,

3

/ 2

)° 7

/ 2 44893.939 92 7 (

7 D2) (2,8/2)°

5

/ 2 91 5 (*D2) (2,8/2)°

‘/2 39 40 (8P1) (1,8/2)°

3

/ 2 70 15 (8P2) (2,V2)°
76

Ce II, Odd Parity—Continued

Configuration Term J

Level (cm -1

) 9 Leading percentages

4/3 2 H°2 9

/ 2 44949.011 61 9

2 H°1

“/2 16588.131 66 12

4/3 7 /2 47430.184 35 2G°1 31 4G°

4/3 4 G° 5

/2 47459.894 98 1 4/(2 F°)5d2

( 3 P) 4G°

7 /2 48330.79 67 18 2 G°1

9

/2 48549.99 65 11 2 G° 1 n/2 4961 7.70 93 4

2 H°1

4/3 2 K° 13

/2 48045.10 98 1 2

J

°

15 / 49087.88 94 42 L°

4/3 9

/ 2 49267.982 33 2G°1 31 4G°

Ce III ( 3 H4 ) Limit 87500

Ce II, Even Parity

Configuration Term J

Level (cm -1

) 9 Leading percentages

4/2( 3 H)6s 4 H 7

/ 2 3854.012 0.669 95 3 CG) 2G

9

/ 2 4165.550 0.949 55 40 ( 3 H) 2 H

ll/2 5513.709 1.125 82 17 ( 3 H) 2 H

13/2 6967.547 1.225 98 1 4/5d(3 G°)6p 4 H

4/2( 3 H)6s 2 H 9

/ 2 5616.739 0.934 56 42 ( 3 H) 4 H

il/2 7341.007 1.089 81 17

4/2

( 3 H)5d 2 H 9

/ 2 7011.804 0.889 65 19 ( 3 H) 4

I “/

2

8278.054 0.957 56 14 ( 3 F) 2 H

4/2

( 3 H)5d 4 K n/2 7092.265 0.803 83 7 ( 3 H) 2

I 13

/ 2 8423.672 0.980 96 2 ( 3 H) 2

I 15

/ 2 9771.956 1.090 100

17

/ 2 11165.796 1.187 100

4/2( 3 F)6s 4p 3

/ 2 7454.951 0.407 95 2 CD) 2 D

5

/

2

7722.285 0.986 68 27 ( 3 F) 2 F

7

/

2

8531.678 1.213 89 4 ( 3 F) 2 F

9

/ 2 8774.064 1.247 61 34 (*G) 2G

4/2

(3 H)5d 4

I 9

/

2

8131.217 0.751 78 11 ( 3 H) 2 H

n/2 8896.729 0.961 92 4 ( 3 H) 2 I 13

/ 2 10058.226 1.105 97 2 ( 3 H) 2

I 15/2 11309.972 1.193 98 1 ( 3 H) 2 K

4/2

( 3 H)5d 4 G 5

/

2

8448.641 0.633 49 30 ( 3F) 4 G

7

/ 2 9316.912 0.992 54 32

9

/ 2 10314.162 1.04 55 34

11

/ 2 11458.353 1.235 48 35

4/2

( 3 F)6s 2 F S

/2 8789.380 0.905 69 28 ( 3 F) 4 F

? /2 9053.629 1.026 54 41 CG) 2 G

4/2( 3 H)5d 4 H 7

/ 2 9725.733 0.694 63 25 ( 3 F) 4 H

9

/ 2 10703.305 0.969 62 27 u/2 11759.467 1.124 64 28

13/2 13027.758 1.210 59 22
77

Ce II, Even Parity—Continued

Configuration Term J

Level (cm' 1 ) 9 Leading percentages

4/2( 3 H)5d 2

I 11 h 10646.070 0.951 46 22 OG) 2

I 18/2 11454.701 1.101 48 27

4/2( 3 H)5d 5

/2 10820.486 34 2 F 26 ( 3F) 2 F

4/2(

1 G)6s 2G 9

/

10869.541 1.193 60 36 ( 3 F) 4 F

7 /2 11015.579 1.016 49 39 ( 3 F) 2 F

4/2( 3 F)5d 7

/

12097.276 38 2 F 32 ( 3 H) 2 F

4/2

( 3 F)5d 4 H 7

/

12456.746 0.691 63 28 ( 3 H) 4 H

9

/

13117.922 36 21 (‘G) 2 H

n/ 2 14276.298 1.114 59 27 ( 3 H) 4 H

i 3

/ 2 15281.602 1.204 61 27 ( 3 H) 4 H

4/2( 3 H)5d 4 p 3

/

12704.634 0.467 68 17 ( 3F) 4 F

4/2( 3 H)5d 2G 7

/

13217.976 45 11 (‘G) 2 F

4/2( 3 F)5d 4 p 3

/

13256.701 60 16 ( 3 F) 2 D

S/2 13436.858 47 13 ( 3F) 2 D

V2 13503.508 64 16 ( 3F) 2 P

4/2( 3 H)5d 4 F S

/2 13268.218 51 12 ( 3 F) 4 F

4/2

( 3 F)5d 9

/2 13527.239 0.963 32 4 H 24 (

l G) 2 H

4/2( 3 F)5d 4G 5

/

13675.722 54 25 ( 3 H) 4 G

4/2( 3 F)5d 3/2 14049.761 34 2 D 14 ( 3F) 2 P

4/2

( 3 H)5d 7 /2 14097.689 40 4 F 17 ( 3 F) 4 G

4/2( 3 F)5d 7 /2 14252.178 30 4G 20 ( 3 H) 4G

4/2( 3 H)5d 9

/

14387.112 33 4 F 16 ( 3 H) 2G

4/2(

1 G)5d ll/2 14625.503 44 2 H 16 ( 3 H) 4G

4/2( 3 F)5d 3

/

14727.540 35 4D 27 ( 3 F) 2P

4/2

( 3 F)5d 5/2 14739.761 24 4 jr 19 ( 3 H) 2 F

4/2

(

1 G)5d 7

/

14827.623 27 2G 12 ( 3 H) 2 G

4/2

( 3 F)5d 9/2 15134.048 41 4G 18 ( 3 H) 4G

4/2

( 3 F)5d 4 P 3

/

15235.579 49 19 ( 3 H) 4 F

4/2

( 3 F)5d 5

/

15434.699 29 4 F 22 ( 3 F) 2 D

4/2

( 3 F)5d 4 D V2 15510.786 74 21 ( 3 F) 2 P

5

/

15529.576 80 5 (

4 G) 2 D

3

/15576.568 50 28 ( 3F) 2 P

7

/

16152.377 48 27 ( 3F) 4 F

4/2( 3 H)5d 2 K 1 S

/2 15593.660 76 15 (»I) 2 K

15/2 17232.652 80 18

4/2( 3 H)5d 9

/

15803.310 38 2G 12 ( 3F) 4G

4/2

( 3 F)5d 7

/

15822.059 28 4 D 16 (

l G) 2G

4/2( 3 H)5c£ 9

/15859.363 43 4 F 35 (!G) 2 G

4/2

(

1 D)6s 2 D 5

/2 16133.194 68 5 ( 3P) 4 P

3

/

16268.673 86 4 ( 3P) 2 P

4/2

(

1 D)6s 5

/16454.555 17 2 D 12 4/2

( 3 H)5d 4 F

4/2

( 3 F)5d 4G n/ 2 16545.269 47 23 ( 3 H) 4G

4/2

( 3 F)5d 7/17000.007 28 4 p 20 ( 3 H) 4 F

4/2

( 3 F)5d 4 F 9/17571.401 55 17 (‘G) 2G
78

Ce II, Even Parity—Continued

Configuration Term J

Level (cm' 1 ) 9 Leading percentages

4/2

(

x G)5d 2 D 5

/2 17976.413 56 27 ( 3 F) 2D

3

/

2

58 20

4/2( 3 F)5d 7

/

2

18393.327 36 2G 18 CD) 2G

4/2

(

1G)5d 2

I ll/2 18704.313 56 23 ( 3 H) 2

1 13

/ 2 19950.340 62 26

4/2( 3 F)5d 2 H 9

/

2

19481.040 47 13 CG) 2 H

ix/2 20554.596 51 11 ( l I) 2 H

4/2(

1 G)5d 2 F

S

/2 19483.225 50 27 ( 3F) 2 F

4/2( 3 F)5d 9

/2 19982.187 42 2G 17 (

X D) 2G

4/2( 3 P)6s 4 p */2 86 5 ( 3P) 2P

3

/

2

87 6 ( 3P) 2 P

5 /2 20714.959 87 6 (

X D) 2 D

4/2

(

x I)6s 2

I ll/

2 20783.79 96 3 4/5d( 1 H°)6p 2

I is/2 20881.327 97 3

4/2

(

1 G)5d 7

/

2

20940.839 33 2F 26 ( 3 F) 2 F

4/2( 3 P)6s 2P V2 58 15 4/2

(

1 D)5d 2P

3

/

2

21373.623 66 12

4/2( 3P)5d 3

/

2

22290.320 30 4P 17 ( X D) 2 D

4/2( 3 P)5d 5

/2 22576.170 32 4 jr 19 (»D) 2 F

4/2( 3P)5d 3/

2

22903.974 34 4JT 21 ( 3P) >P

4/2( 3 P)5d 4P 5/2 23200.331 45 15 ( 3P) 4 F

4/2( 3P)5d 7

/

2

23267.351 41 4 F 16 (

X D) 2 G

4/2(

x D)5d 3

/

2

23508.880 34 2 D 29 ( 3P) 4 P

4/2( 3 P)5d 9

/

2

23640.563 33 4JT 29 (

X D) 2G

4/2(

x D)5d S

/2 23782.988 40 2F 28 ( 3P) 4 F

4/2(

1 D)5d 7 /2 24153.466 34 2G 18 ( 3P) 4 F

4/2(

x D)5d 5/2 24500.756 43 2 D 21 ( 3P) 4 P

4/5d( x G°)6p 9

/

2

24663.053 0.933 34 2 H 25 ( 3 H°) 2 H

4/2

(

x D)5d 7

/

2

24819.334 43 2 F 18 ( 3P) 4 F

4/2

( 3P)5d 3

/

2

25099.482 43 2P 13 ( 3P) 4P

4/5d(3 F°)6p 4 G S/2 25359.686 0.761 42 23 (

X D°) 2 F

7

/

2

27187.047 1.015 51 11 (

X D°) 2 F

9

/2 29166.597 1.124 64 9 ( 3G°) 4 G

n/2 31089.731 1.221 59 12 ( 3G°) 4 H

4/2

( 3P)5d 4 jr 9

/

2

25361.674 45 28 (

X D) 2G

4/2( 1 I)5d 2

I ll/2 25492.251 92 3 ( 3 H) 2

I 1S/2 25753.492 84 8 (

X I) 2 K

4/5d(3 F°)6p 3

/

2

25681.488 0.692 32 4jr 27 ( 3 F°) 2 D

4/5d(1 G°)6p 7

/

2

25945.396 0.941 44 2G 17 ( 3 H°) 4 H

4/2( 3 P)5d 4 D x h 26351.911 86 7 ( 3P) 2P

3

/

2

26479.921 86 4 ( 3P) 2 P

5/2 26817.940 88 2 4/5d(3 P°)6p 4 D

7 /2 27514.660 58 13 4/5d(3 H°)6p 4 H

4/5d(3 H°)6p 9

/

2

26841.384 0.954 42 4I 28 (

X G°) 2G

4/5d(3 H°)6p 7

/

2

26900.354 0.841 23 4H 18 ( 3F°) 2G
79

Ce II, Even Parity—Continued

Configuration Term J

Level (cm -1

) g Leading percentages

4/5d(3 F°)6p 4p 5

/2 27249.669 1.061 55 13 (3F°) 2 D

4/2(

1 I)5d 2 L 15/2 27353.67 98 1 ( 3H) 2 K

17 /2 28096.58 100

4/5d( 1 G°)6p n/2 27379.949 1.052 40 2 H 33 ( 3H°) 4

I

4/2

(

1 I)5d 2 K 13/2 27706.631 75 15 ( 3 H) 2 K

15/2 28117.519 81 17

4/2( 3 P)5d 7

/ 2 27811.496 26 4 D 24 4/5d(3 H°)6p 4 H

4/5d(3 F°)6p 5

/2 27812.398 40 4 G 17 ( 3G°) 2 F

4/5d(3 F°)6p 3/ 2 27835.233 0.833 32 4p 26 (>D°) 2P

4/2

(

1 I)5d 2 H 9

/2 27905.157 0.920 77 7 ( 3F) 2 H

”/2 27950.889 81 8

4/5d(3 H°)6p 9/ 2 27934.638 0.969 35 4 H 27 (!G°) 2 H

4/5d(3G°)6p 4 H 7/ 2 28297.473 0.906 46 13 ( 3G°) 2G

9

/ 2 29908.904 1.074 44 15 ( 3G°) 2 G

11 h 31738.484 1.140 64 13 ( 3 F°) 4 G

13/2 33531.388 1.257 95 2 ( 3 H°) 4 H

4/5d(3 H°)6p 9/ 2 28334.756 0.891 38 2 H 31 ( 3H°) 4

I 4/5d(3 G°)6p 3

/2 28337.814 0.916 26 4G 16 ( 3G°) 2 F

4/5d( 1 D°)6p V2 28345.313 0.387 44 2P 43 ( 3 F°) 4 D

4/5d(1 G°)6p 11/2 28634.516 1.080 37 2 H 27 ( 3 H°) 4

I 4/5d( , G°)6p 5

/2 28685.758 0.827 37 2F 14 ( 3H°) 4G

4/5d(3 H°)6p 9

/ 2 28725.148 1.002 36 4 H 18 GG0

) 2 H

4/5d(3 F°)6p 4JT 7

/ 2 28730.712 1.124 54 7 (3 F°) 4 G

4/5d(3 F°)6p 3/2 29029.353 0.980 31 2 D 29 (1 D°) 2P

4/5d(3 F°)6p 5/2 29281.374 1.052 23 2 D 22 ( 3 F°) 4 D

4/2

( 3 P)5d 7

/ 2 29364.740 0.894 17 2 F 14 4/5d(3G°)6p 2 F

4/5d(3 H°)6p li/2 29438.817 1.041 39 4I 31 (3 H°) 2H

4/5d(3G°)6p 3

/ 2 29449.778 0.723 36 4p 23 ( 3F°) 4 D

4/2( 3 P)5d 2 F 5

/2 29673.771 51 13 5d3 2 F

7 /2 29807.078 1.055 39 8

4/5d(3 D°)6p V2 29790.270 0.45 39 2 P 26 ( 3F°) 4 D

4/5d(3 F°)6p 7

/ 2 29794.517 1.052 24 2 F 15 ( 3F°) 4 D

4/5d(3 F°)6p 3

/

29984.052 0.773 38 4 D 14 ( 3G°) 4 F

4/5d(3 G°)6p 5

/2 29994.041 34 4G 21 ( 3G°) 4 F

4/5d(3 F°)6p 7

/

30065.164 1.075 29 4 D 12 ( 3 H°) 2G

4/5d(3 H°)6p 4 H ‘V2 30134.910 1.146 53 22 ( 3 H°) 2 H

4/5d(3 G°)6p 7 /2 30166.057 1.036 30 4G 16 (4D0

) 2p

4/5d(3 H°)6p 4

I 13/ 2 30180.096 1.115 91 9 ( 3 H°) 4 H

4/5d(3 F°)6p 9

/

30245.878 1.225 41 4p 21 (

lG°) 2G

4/5d(3 H°)6p 3/2 30425.349 0.831 37 4G 15 4/6s(3 F°)6p 4G

4/5d(3 F°)6p 3/2 30637.157 1.125 10 2 D 10 ( 3G°) 2 F

4/5d(3G°)6p 9

/

30702.610 1.079 30 4 H 15 ( 3 f°) 2 G

4/6s(3 F°)6p 3/2 30745.286 | 29 4 F 28 4/5d(3 D°)6p 4 F
80

Ce II, Even Parity—Continued

Configuration Term

' J

Level (cm" 1 ) 9 Leading percentages

4/5d(3 G°)6p 7

/ 2 30829.124 1.016 25 4G 12 (>D°) 2 F

4/5d(1 D°)6p 3

/ 2 30961.518 1.043 25 2 D 17 ( 3 F°) 4 D

4/5d( 1 D°)6p l h 31032.611 0.692 31 2P 24 ( 3 F°) 4 D

4/5d(3 F°)6p 5/2 31043.110 1.014 29 2 F 26 ( 3 F°) 4 D

4/5d(3G°)6p 9

/2 31075.603 1.207 24 4 p 23 ( 3G°) 4 G

4/5d(3 H°)6p 4 H 13/2 31155.623 1.203 80 9 ( 3 H°) 4

I 4/5d(3 D°)6p 3

/ 2 31170.645 1.118 31 2 P 19 ( 3 D°) 4 D

4/5d(3 F°)6p 7 /2 31207.927 1.123 15 4 D 12 ( 3G°) 4 F

4/5d( 1 D°)6p S/2 31234.878 0.975 20 2 F 16 (

l D°) 2 D

4/5d(3 D°)6p 5/2 31369.093 15 4 p 15 5

d

3 4 F

4/5d(3 G°)6p 7

/ 2 31558.626 1.167 13 4p 12 ( 3 D°) 4 F

4/2(

1 I)5d 9

/ 2 31568.019 1.138 33 2G 17 4/5d(3G°)6p 4G

4/2

( 3 P)5d 3

/ 2 31766.109 32 2 D 11 5d3 2 D2

4/5d(3 D°)6p S/2 31851.397 1.238 20 4P 18 ( 3 D°) 4 D

4/5d(3 G°)6p 9

/ 2 31930.936 1.149 31 4G 20 4/2

(

1 I)5d 2G

4/5d(3 H°)6p 7

/ 2 31937.653 29 4G 23 ( 3H°) 2G

4/6s(3 F°)6p 5/2 32138.698 1.008 23 4p 11 4/5d(3G°)6p 2 F

4/2 0I)5d 9

/

2

32197.982 1.195 28 2G 16 4/5d(3G°)6p 4F

4/5d(3 H°)6p 4

I 15/2 32269.252 1.195 100

4/5d(3 D°)6p 4 P V2 32314.466 57 20 ( 3 D°) 4 D

3

/2 33050.291 1.426 48 14 ( 3 D°) 2 P

4/5d(3F°)6p 7/2 32318.175 1.118 15 2 F 14 ( 3G°) 2 G

4/2(

1 I)5d 2G 7

/

2

32413.346 1.019 68 7 4/5d( 1 H°)6p 2G

4/5d(3 G°)6p U/ 2 32492.038 1.221 43 4G 28 ( 3H°) 4G

5d

3 3

/

2

32507.442 0.643 26 4p 22 4/2

( 3P)5d 2D

4/5d(3 D°)6p 3

/2 32638.165 1.070 37 4 D 12 ( 3P°) 4 D

4/2( 3P)5d 5/2 32716.647 1.151 28 2 D 8 5

d

3 4 F

4/5d(3 H°)6p 2

I n/2 32802.165 0.948 83 3 (‘H0

) 2

I 18/2 34513.468 1.079 84 8 ( 3 H°) 4 H

4/5d(3P°)6p 4 P V2 32860.353 56 9 ( 3 D°) 2 P

3

/

2

33876.377 1.535 68 8 5d2

( 3 P)6s 4 P

4/5d(3 F°)6p 7

/ 2 32862.767 1.009 21 2G 17 ( 3G°) 2 F

4/2( 3P)5d S /2 33045.095 1.188 35 2 D 15 4/5d(3 D°)6p 4P

5d

3 7

/

2

33079.512 1.257 27 4 p 17 4/6s(3 F°)6p 4 F

5d

3 5

/2 33148.589 1.098 21 4 p 16 4/5d(3 D°)6p 4P

4/5d(3 P°)6p V2 33177.196 1.484 21 4P 18 ( 3 D°) 4 P

4/5d(1 F°)6p 9

/2 33296.805 18 2G 18 ( 3G°) 2G

4/5d(3 D°)6p 7

/

2

33409.897 15 4 D 14 ( 3G°) 2 F

4/6s(3 F°)6p 5

/ 2 33552.582 0.920 13 2 F 11 (

l F

°

) 2 F

4/6s(3 F°)6p 3

/ 2 33574.145 0.675 20 4p 15 4/5d(3 D°)6p 4 F

4/5d(3 H°)6p 11/2 33659.968 1.249 41 4G 21 ( 3G°) 4G

4/5d(3 D°)6p 5/2 33808.317 1.230 44 4 D 16 ( 3 P°) 4 D

4f5d(3 G°)6p 2 H 9

/ 2 33811.567 1.090 43 16 ( 3G°) 2G

11/2 35716.083 1.096 61 9 ( 3 H°) 2 H
81

Ce II, Even Parity—Continued

Configuration Term

1 J

Level (cm -1

) 9 Leading percentages

4/5d(3 D°)6p ?/2 33977.140 1.186 17 4 p 10 4/6s( 1 F°)6p 2 F

4/6s(3 F°)6p l h 34006.822 40 4 D 26 4/5<2(3P°)6p 4 D

4/5rf(3 G°)6p 9

/2 34044.441 1.102 22 2 H 16 5d3 4 F

5d

3 7

/2 34155.311 1.151 19 4p 10 4/6s(3 F°)6p 4 F

4/2

(

1 S)6s 2 S V2 34159.877 68 12 5d2

(

1 S)6s 2 S

4/6s(3 F°)6p 3

/34166.039 17 4p 15 ( 3 F°) 4 D

4/5d(3 H°)6p 2 G 9

/2 34295.450 1.125 45 13 ( 3 H°) 4 G

4/6s(3 F°)6p 5

/2 34333.096 1.069 28 4G 13 (‘F°) 2 D

4/5d( 1 F°)6p 5

/

34426.037 0.997 24 2 D 9 4/6s(3 F°)6p 4 D

4/6s(3 F°)6p 3

/34767.688 0.974 18 4 D 17 4/5d(3 D°)6p 2 D

4/5d(3P°)6p 5/2 34813.202 1.269 28 4 P 16 ( 3 D°) 2 F

4/5d(1 F°)6p 7

/

34920.788 1.109 25 2G 20 ( 3 D°) 4 D

4/5d(3 D°)6p 9

/34928.969 1.275 38 4p 22 5d3 4 F

4/6s(3 F°)6p 5

/34934.421 1.134 29 4 D 17 ( 3F°) 4 F

4/5d(3 P°)6p 4 S 3/2 35197.840 0.999 61 8 ( 3P°) 2 P

4/5d(3 P°)6p S

/2 35225.656 1.217 23 4 P 10 ( 3 D°) 2 F

4/6s(3 F°)6p 7

/

35346.282 1.119 18 4G 16 ( 3 F°) 4 F

4/5d(3 D°)6p 3/2 35457.318 2.799 19 2 D 19 ( 3P°) 2 D

4/6s(3 F°)6p 7

/35558.702 1.197 15 4 D 15 ( 3F°) 4 G

4/6s( 1 F°)6p 9

/

35807.568 1.199 26 2G 15 ( 3F°) 2 G

4/6s(3 F°)6p 7/2 35925.682 1.075 17 4G 16 ( 3 F°) 4 D

4/6s( 3 F°)6p 7/2 36112.021 1.184 20 4 D 19 4/5d( 1 F°)6p 2 F

4/6s( 1 F°)6p 5

/

36137.604 1.060 20 2F 19 4/5d(3 D°)6p 2 D

4/6s(3 F°)6p 4G 9

/36202.557 1.186 47 14 4/5d(3 H°)6p 4G

4/5d(3P°)6p 1 h 36288.661 36 2? 15 5d2

( 3P)6s 2P

4/5d(3P°)6p 3

/

36516.798 25 4S 22 ( 3P°) 2 P

4/5d(3 D°)6p 5

/36844.305 1.091 18 2D 16 4/6s( 1 F°)6p 2 D

4/6s( 1 F°)6p 7

/36893.770 1.062 21 2G 17 4/5d(3 D°)6p 2 F

4/5d( 1 H°)6p 9

/36923.789 1.104 27 2 H 12 ( iF°) 2 q

4/5cJ(1 F°)6p 3

/37078.879 0.695 20 2 D 18 5d2

( 3 F)6s 4F

4/6s(3 F°)6p 9

/37196.137 1.175 17 4G 15 ( 3F°) 4 F

4/5d(3 P°)6p 3

/37232.438 0.625 25 2 D 25 5d2

( 3 F)6s 4 F

4/5d( 1 F°)6p 5

/2 37342.327 1.194 19 2F 16 4/2

(

l S)5d 2 D

4/5d(3P°)6p 3

/37530.630 1.112 27 4 D 12 4/6s( 3F°)6p 4 D

4/5d( 1 F°)6p 7

/37588.473 1.142 38 2F 19 ( 3 D°) 2 F

4/6s(3 F°)6p 1 h 37615.734 40 4D 30 4/5d(3P°)6p 4 D

4/5d(3P°)6p 5

/37652.091 1.108 29 2D 25 ( 3P°) 4 D

4/2

(

1 S)5d 3

/37804.434 0.908 14 2 D 14 5d2

( 3 F)6s 4 F

5d2

( 3 F)6s 4 F S

/2 37848.550 1.082 49 23 4/5d(3G°)6p 4 F

7

/

38809.476 1.192 53 22

9

/

39871.833 63 22

4/5d( 1 H°)6p 2 H ll/2 37970.532 56 22 5d3 2 H

5d

3 2G 7/2 37973.771 53 13 4/5d( x F

0 )6p 2G
82

Ce II, Even Parity—Continued

Configuration Term J

Level (cm' 1 ) 9 Leading percentages

4/5d(*F°)6p 9

/2 38134.400 0.621 25 2G 22 0H°) 2 H

4/6s(3 F°)6p 4G u/2 38137.682 71 13 4/5d(3 H°)6p 4G

4/5d(3 P°)6p l h 38269.974 33 2S 23 5rf3 4 P

4/6s( 1 F°)6p 3h 38452.750 24 2 D 15 ( 3 F°) 4 D

4/5d(3 D°)6p 3

1 2 38529.021 1.169 19 2 D 12 4/2

(

1 S)5d 2D

5d

3 9

/ 2 38541.873 1.097 35 2G 10 4/5d( 1 H°)6p 2G

4/6s(3 F°)6p 5

/

2

38832.709 1.273 35 4 D 13 (>F°) 2 D

4/5d(3P°)6p X /2 38892.501 30 2S 24 5d3 4 P

5d

3

3/2 38937.812 1.399 34 4P 9 4/5d(3P°)6p 2P

4/5d(3P°)6p

7

/

2

39394.990 1.396 42 4 D 23 4/6s(3 F°)6p 4 D

5d3 4p 5/2 39838.445 1.577 67 16 4/2

( 3P)5d 4 P

5d3

1 h 39855.395 30 2P 22 4 P

5d3 3

/2 40511.127 27 2P 22 4 P

4/5d( 1 H°)6p 2

I n/2 40673.575 74 13 5d3 2 H

13

/2 41992.356 90 6 ( 3 H°) 2

I

4/5d( 1 H°)6p 2G 9

/

2

40858.205 45 14 (

l H°) 2 H

7 /2 41085.208 57 14 5d2

(

x G)6s 2G

5d3

2 H 9

/

2

41083.294 49 16 4/5d( 1 H°)6p 2 H

ll/2 41289.971 1.090 53 27

5d2

( 3 F)6s

2 F 5

/2 41198.309 51 9 5d3 2 F

7

/

2

42573.191 1.143 52 19

4/5d(1 P°)6p

2 P */2 41589.12 73 13 ( 3P°) 2 S

3

/

2

42458.743 40 10 5d3 2 D2

4/5d( 1 P°)6p 3/2 41748.279 0.880 23 2 D 16 5d2

(

l D)6s 2 D

5d2

(

l D)6s S

/2 42033.653 1.161 21 2 D 20 4/2

(

x S)5d 2 D

4/5d( 1 P°)6p 3

/

2

43167.878 35 2 D 32 (ip<=) 2p

4/5d( 1 P°)6p 2 S

X /2 43334.332 66 15 ( 3P°) 2 S

4/5d(1 P°)6p 2 D 3

! 2 43460.533 1.170 64 7 5d3 2 D2

5d2

( 3 P)6s 4p X /2 43643.230 75 9 4/5d(3 D°)6p 4P

3

! 2 44081.375 77 7 4/5d(3 D°)6p 4 P

5

/ 2 44594.928 1.573 68 9 5d3 2 D1

5d3 3

/ 2 46987.371 31 2 D2 24 5d2

( x D)6s 2 D

5d2

(

1 D)6s 3h 47466.445 34 2 D 29 5d3 2 D2

5d2

(

1 G)6s 2G 7

/ 2 47489.280 48 22 4/6s(3 F°)6p 2G

9

/

2

48151.739 67 8 4/6s( 1 F°)6p 2G

4/6s(3 F°)6p 3

1 2 48024.675 36 2F 28 5d3 2 F

4/6s(3 F°)6p 3

/ 2 48630.464 26 2 D 22 5d2(»D)6s 2 D

5d3 2 F 7

/ 2 48657.336 49 19 5d2

( 3 F)6s 2 F

5d

3 5

/2 49089.486 38 2 F 18 4/6s(3 F°)6p 2 F

4/6s(3 F°)6p 7

/ 2 50368.336 24 2 F 15 ( 3 F°) 2G

5d(2 D)6s2 ?

5

/ 2 50564.294 32 2 D 26 4/6s(3 F°)6p 2 D

4/6s(3 F°)6p 7

/ 2 51171.581 23 2G 20 ( 3 F°) 2 F

4/6s(3 F°)6p 2 G 9

/ 2 52058.587 51 16 (

X F°) 2G

Ce ill ( 3 H4 ) Limit 87500
83

Ce III

(Ba i sequence; 56 electrons) Z=58

Ground state (ls 2 2s2 2p6 3s2 3pfi 3d 10 4s 2 4p6 4d 10 5s2 5pfi ) 4/ 2 3 H4

Ionization energy 162903± 20 cm" 1 20. 198± 0.003 eV

Identified even configurations 4/ 2

, 5

2

, 4/6p, 5d6s, 4/5/, 4/7p, 4/6/ 6

p

2 ?, 5d6d

Identified odd configurations 4/5d, 4/6s, 4/6d, 4/7s, 5d6p, 4/8s, 4/7d, 4/5p

Most of the energy levels found by Kalia are based on real wavenumber differences, but

the first correctly designated levels were given by de Bruin, Lier, and van de Vliet [1937], and

by Russell, King, and Lang [1937], The latter analysis gave nearly all the levels of seven

configurations. These did not include, however, the 4f

2 ground configuration, which Sugar

located in his extension of the analysis. His observations of the sliding-spark spectrum (1700 new lines, 757-11091 A) increased the known lines by a factor of 7 and yielded 126 new levels. Sugar also gave improved values for the previously known levels and assigned designations in appropriate coupling schemes. More recently Johansson and Litzen observed 31 infrared lines of Ce ill (1. 1-2.6 /urn) and completed the 4f

2 configuration by finding the 3 P term.

Levels, Ionization Energy, g Values

Most of the energy levels and designations are from Sugar’s paper. The 4/ 2 3 P levels are from Johansson and Litzen, as are some improved values for other 4/ 2 levels. Wyart recently

located the 5d 2 ’S 0 level. The analysis is remarkably complete, almost all the expected levels having been found for 14 of the 17 identified configurations. Five of the 26 possible 4/6/ levels are missing. Sugar noted that his assignments of eight high even levels to 6p2 and 5d6d were

not positive; we give the 6

p

2 identification as tentative, as only one level was assigned to this configuration. Sugar’s level for 5d6p 'P° (102249.70 cm

-1

) does not agree well with the position

calculated by Spector (103780 cm

-1

). Since the experimental evidence for the level is not

strong, it is listed as questionable.

Sugar and Reader derived the ionization potential from the 4/6s-8s series, using a correction for the estimated deviation from the Ritz formula.

The g values are mainly from Russell et al., from van de Vliet, or from our reductions of

patterns given by these authors. An additional few values were taken from de Bruin et al. or from our reductions of patterns they measured. Most of the g values not followed by a colon are probably accurate to ±0.02. Values given with a colon are based on poor or unresolved

patterns, and are in general less accurate.

Theory

Goldschmidt’s [1968a] calculations have been used for the 4/ 2 configuration and for the

(4/6p+5d2 +5d6s) group. The effects of the (4/6p+5d2

) configuration interaction on the four

J=4 levels between 50000 and 55000 cm

-1 are noteworthy. Since each of these levels has well over 50% 4/6p configurational purity, all four are listed with this configuration in the first column, even though a pure fp configuration has only three J=4 levels. The good jj2 coupling

shown by the 4/6p levels having other J values cannot hold for these four levels sharing three

designations, and their leading// components range from 41% to 53%. The level with smallest

leading percentage (51289.38 cm"1 ) has no assigned // name, but it has a higher total 4/6p

configurational purity than two of the J=4 levels having such names. The basic reason for the

low purities of the four levels is the interaction of 4/6p with 5d

2 [Goldschmidt, 1968b], as evidenced by the large second percentages from 5d

2 'G listed for two of the levels. Goldschmidt notes that the composition of each of these two levels (named 4/(

2 F°/2 )6p 1/2 and

4/(2 F°/2 )6p3/2 in the table) has a total of about 80% 'G character if the percentages from both

configurations are given in LS coupling. The strong interaction of 4/6p 'G and 5d

2 'G causes
84 Ce III —Continued

the 5d

2 'G components to be distributed among the four levels in such a way that 5d

2 is missing as a designation. This case furnishes one of the simplest examples of some effects of

configuration interaction having many analogues in more complex rare-earth spectra.

The percentages for the 4/5d levels are from a calculation by Goldschmidt and Salomon.

The inclusion of effective interactions in this calculation significantly improved the

eigenvectors for several of the levels, as shown by comparisons of observed with calculated g

values [Goldschmidt, 1973].

The four levels of 4/6s have very high purity in the jxj2 coupling scheme [Goldschmidt,

1967].

Spector’s results have been used for the percentages of the 5d6p, 4/6d, 4/7/ and 4f5g

odd levels. The leading component for each of the 4/6d levels is given in both the jt

l and LS

coupling schemes, and leading components for the 4/7d levels are given in the jx l and jj2 schemes. The percentages for the 4/5/ 4/6/ and 4/7p even configurations are also from

Spector. Most of Sugar’s LS designations for the 4/5/ levels, made on the evidence of the

intensities of the 4/5d-4/5/ lines, were confirmed by Spector’s calculations. The LS scheme

does not furnish satisfactory names for 6 of the 26 4/5/ levels, however, and the j x l scheme is definitely preferred.

References

Crosswhite, H. M., Phys. Rev. A 4, 485 (1971). PT

de Bruin, T. L., Lier, J. N., and van de Vliet, H. J., Proc. K. Ned. Akad. Wet. 40, 334 (1937). EL CL W ZE

Goldschmidt, Z. B., Colloq. Int. C.N.R.S., No. 164, 365 (1967). ND PT

Goldschmidt, Z. B., Thesis, Hebrew Univ. Jerusalem, Israel, 487 pp. (1968a). ND PT

Goldschmidt, Z. B., Spectroscopic and Group Theoretical Methods in Physics, Ed. F. Bloch et al., pp. 411-457 (John

Wiley & Sons, Inc., New York, N.Y., 1968b). ND PT

Goldschmidt, Z. B., Atomic Physics 3, Ed. S. J. Smith and G. K. Walters, pp. 221-246 (Plenum Press, New York, N.Y.,

1973). PT

Goldschmidt, Z. B., and Salomon, D., unpublished material (1974). PT

Johansson, S., and Litzen, U., Phys. Scr. 6, 139 (1972). EL CL W

Judd, B. R., Crosswhite, H. M., and Crosswhite, H., Phys. Rev. 169, 130 (1968). PT

Kalia, P. N., Indian J. Phys. 8, 137 (1933). EL CL

King, A. S., and King, R. B., Astrophys. J. 75, 40 (1932). W

Russell, H. N„ King, R. B., and Lang, R. J., Phys. Rev. 52, 456 (1937). EL CL W ZE IP

Spector, N., J. Opt. Soc. Am. 55, 492 (1965). ND PT

Sugar, J., J. Opt. Soc. Am. 55, 33 (1965). EL ND CL W IP

Sugar, J., and Reader, J., J. Chem. Phys. 59, 2083 (1973). IP van de Vliet, H. J., Thesis, Univ. Amsterdam, 85 pp. (1939). ZE

Wyart, J. F., private communication (1976). EL

[October 1976]
85

Ce III, Even Parity

Configuration Term J

Level (cm -1

) 9 Leading percentages

4/2 3 H 4 0.00 97 5 1528.32 100 6 3127.10 100

4/2 3 F 2 3762.75 98 3 4764.76 100 4 5006.06 58 40 *G

4/2 ‘G 4 7120.00 57 42 3 F

4/2 >D 2 12835.09 90 8

3P

4/2 3P 0 16072.04 99

1 16523.66 100 2 17317.49 92 8 'D

4/2 G 6 17420.60

“ 100

4/2 ‘S 0 32838.62 99

5d2 3 F 2 40440.20 0.70: 95 3 41938.54 1.08: 98 4 43517.46 1.27: 97

5d2 >D 2 46889.79 1.06: 71 15 3P

bd2 3P 0 48075.96 99

1 48674.12 100 2 50043.85 82 14 ‘D

4/( 2 Fg/ 2 ) 6p1/2 ( 5 /2,V2) 3 48267.00 0.87 97 2 48404.86 0.81 89

4/( 2 F?/2 )6pi / 2 ( 7 /2,V2) 4 50057.60 1.06 52 36 5d

2 !G

3 50375.00 1.16 91

4/( 2 F§/2)6p3/2 ( 5

/ 2, 3

/ 2) 3 51262.21 0.94 92 2 51640.68 0.99 91

1 51932.34 0.40 95 4 52440.96 1.135 45 38 ( 7

/2,3/2)

4/6p 4 51289.38 1.09 41 ( 7/2,V2) 32 ( 5

/ 2,3

/ 2)

4/(2 F7/2)6p3/2 ( 7

/2,3/2) 3 53615.98 1.24 94 5 54193.84 1.21 100 4 54549.34 1.05 53 27 5d

2 l G

2 54556.48 1.08 93

bd6s 3 D 1 63335.40 95 2 64010.70 93 3 65550.73 96

5d2 7 S 0 67730.3

bdbs 2 70433.08 90

4/(2 Fg/2 )5/ 2

[ 7

/ 2] 3 98913.68 79 or 59 3G

4 99577.01 77 or 83 " 2

[

1 X

/ 2] 5 99178.16 80 or 67 3

I 6 100015.70 83 or 88 " 2

[ 3

/ 2] 1 99248.38 85 or 52 3 D

2 99894.15 56 or 86
86

Ce III, Even Parity—Continued

Configuration Term J

Level (cm 1 ) 9 Leading percentages

4/(2 Fs/2)5/ 2

t 9

/2] 5 99604.30 69 or 40 X H

4 100814.08 86 or 77 3 H

" 2

t 5

/2] 3 99708.39 67 or 30 3 D

2 101354.33 72 or 69 3 F

" 2

t

l /2] 1 100189.69 62 or 33 3 D

0 102502.41 94 or 81 3P

4/(2 F§/2)7pi/2 ( 5/2,V2) 3 100662.63 98 2 100734.04 94 6 ( 5

/ 2, 3/ 2 )

4/(2 F?/2 )5/ 2

[ 9

/ 2 ] 5 101178.46 83 or 77 3G

4 102566.29 74 or 42 X G

" 2 [*V2 ] 3 101343.93 66 or 55 3 D

2 103231.23 62 or 36 3P

" 2

[ l3

/ 2] 7 101564.83 100 or 100 3

I 6 103676.13 67 or 81 X I " 2

[ 3

/ 2] 1 101647.49 46 or 50 3 S

2 104177.07 74 or 55 3 P

4/(2 F§/2 )7p3/2 ( 5

/2,3

/ 2 ) 3 101821.97 98 2 102173.68 94 6 ( 5

/2,

1 /2) 4 102221.92 98

1 102369.48 100

4/(2 F7/2)5/ 2

[ 11

/2] 5 102408.70 72 or 83 3 H

6 102897.68 77 or 83

•• 2

[ ?

/ 2] 3 102649.22 55 or 83 3 F

4 103351.21 83 or 67

4/(2 F?/2)7p!/2 ( 7

/2,

1 /2> 3 102961.29 94 4 ( 7

/ 2, 3

/ 2 ) 4 103079.67 92 5

4/(2 F?/2 )5/ 2[>/2] 1 103612.68 58 or 85 3P

0 94 or 81 l S

4/(2 F?/2 )7p3/2 ( 7

/ 2,3

/ 2 ) 4 104289.06 94 5 ( 7

/2,

l /2) 3 104293.20 94 6 ( 7

/ 2,

1 / 2 ) 5 104351.04 100 2 104840.50 100

4/(2 FI/2)6/ 2

[ 7

/ 2 ] 3 122160.10 79 21 ( 2Fg/2) 2

[ 5

/ 2] 4 122628.94 80 "

5 122289.31 75 25 ( 2 FI/2) 2

[ 9

/ 2 ] 6 122870.19 92 " 2

[ 9

/ 2 ] 5 122611.07 70 25 ( 2 F§/2) 2

[ 1X /2] 4 123201.62 83 " 2

[ 5

/ 2 ] 3 122688.60 74 20 ( 2 F§/2) 2

[ 7

/ 2 ] 2 123555.41 67 31 ( 2 F§/2) 2

[ 3

/ 2 ] " 2

t 3

/2] I 88 2 122807.84 59 32 ( 2F§/2) 2

[ 5

/2 ] " 2 [V2] 1 122980.12 83 0 99

4/(2 F?/2 )6/ 2

[ 9

/ 2 ] 5 124433.38 80 20 ( 2F?/2) 2

[ ll

/ 2 ] 4 125091.24 74 20 ( 2 F?/2) 2

[ 7

/ 2 ]
87

Ce III, Even Parity—Continued

Configuration Term J

Level (cm 1 ) 9 Leading percentages

4/(2 F?/2 )6/ 2

[ 5/2] 3 124510.28 64 36 ( 2 F7/2 ) 2

[ 7

/ 2 ] 2 125399.50 74 18 ( 2 F7/2 ) 2

[ 3

/ 2 ] " 2

[ 13 /2] 7 124609.73 100 6 125710.16 59 36 ( 2 F?/2 ) 2

[ u/ 2 ] " 2

[ ll

/2] 5 125006.22 80 20 ( 2 F?/2 ) 2

[ 9

/ 2 ] 6 125301.13 62 32 ( 2F?/2 ) 2

[ 13

/2 ] " 2

[ ?

/ 2 ] 3 125132.28 60 35 ( 2 F7/2 ) 2

[ 5

/ 2 ] 4 125615.94 80 20 ( 2 F?/2 ) 2

[ 9

/ 2 ]

4/(2 F?/2 )6/ 2

[ 3

/ 2 ] 1 66 31 ( 2F?/2 ) 2

[>/2 ] 2 126052.62 77 21 ( 2 F?/2 ) 2

[ s

/ 2 ]

6p

2 ? 3 P? 0

1 130713.26

2

5d6d 3 D 12 136321.39

3 137902.90

5d6d ip 3 136447.67

5d6d 3 F 2 138264.72

3 139477.67

4

5d6d 3 P 0

12 141104.03

5d6d D 2 141803.07

Ce IV ( 2 Fs/2 ) Limit 162903

Ce III, Odd Parity

Configuration Term J

Level (cm -1

) 9 Leading percentages

4/5d

, G

° 4 3276.66 0.99 72 22 3 H°

4/5d

3 F

° 2 3821.53 0.76 72 27 i D

° 3 5502.37 1.10 96 3

3 G°

4 7150.05 1.30 86 8

, G

°

4/5d

3 H° 4 5127727 0.87 77 18 'G°

5 6361727 1.07 100 6 83U9.99 1.17 100

4/5d 3 G° 3 6265721 0.76 93 4

3 F

° 4 7836.72 1.06 94 4

3 F

° 5 9325.51 1.22: 99 1

1 H°

4/5d >D° 2 6571.36 0.88 67 27 3 F

°

4/5d 3 D° 1 8922.05 0.52: 97 2 1P° 2 990049 1.18 95 4

1 D°

3 10126.53 1.34 74 26 i F

°
88

Ce III, Odd Parity—Continued

Configuration Term J

Level (cm -1

) 9 Leading percentages

4/5d 3 p° 0 11577.16 100

1 11612.67 1.29 95 4 iP° 2 1261,1.55 1.38 97 3

i D

°

4/5d i F

° 3 12500.72 1.03 72 26 3D

°

4/5d 1 H° 5 16152.32 1.06 99 1 3Q°

4/5d ip° 1 18W.63 0.99 94 4 3p°

4/( 2 Fg/2 )6si/2 ( 5/2,V2)° 2 1923623 0.665 99 3 19U6h-l*6 1.07 99

4/( 2 F7/2 )6S 1/2 ( 7 /2,V2)° 4 211,76.1,6 1.27 100 3 2181,9.1,7 1.035 100

4/(2 F5/2)6d 2

[ 5 /2]° 2 89350.03 86 or 77 3 F

° 3 90086.92 85 or 67

4/(2 F§/2)7sl/2 ( 5/2,V2)° 2 89596.39

3 89663.07

4/(2 Fs/2)6d 2

[ 9

/ 2

]° 4 89651.92 0.88: 71 or 64 3 H°

5 90658.91, 1.07: 92 or 76 " 2[7/ 2

]° 3 89743.68 86 or 80 3G

° 4 9004527 70 or 36 "

2[3/2]° 1 90144-52 90 or 88 3D°

2 90223.72 86 or 57 " 2[V2]° 1 90878.78 90 or 81 3P°

0 90902.41 100 or 100

4/(2 F?/2 )6d 2 [9/2

]° 4 91735.87 78 or 59 3G°

5 92180.41 69 or 71

4/(2 F?/2)7Sl/2 ( 7

/2,

1 /2)° 4 91840.44

3 91922.55

4/(2 F7/2)6d 2[ 7

/ 2

]° 3 91954-59 55 or 44 3D°

4 92080.62 80 or 74 3 F°

" 2

t 5/2]° 2 92018.61 71 or 40 3 D

° 3 92705.16 56 or 48 1 F

°

" 2[U/2

]° 6 92526.56 100 or 100 3 H°

5 93226.80 1.01: 63 or 69 1 H°

5d6p 3 P

0 2 92635.13 58 37 i D

° 3 96022.31 92 4 99168.82 100

4/(2 F?/2)6d 2

t 3/2] 0 2 92795.44 71 or 64 3p°

1 93602.83 96 or 74 ipo

5d6p 3 D° 1 94508.68 88 2 96375.66 94 3 97964.37 83 10 i F°

5d6p 'D° 2 9582723 53 41 3 F

°

5d6p 3P° 1 99288.43 79 13 1P° 0 100 2 100968.18 88
89

Ce III, Odd Parity—Continued

Configuration Term J

Level (cm 1 ) 9 Leading percentages

5d6p i P

°

1 102249.701 79 18 3p°

5d6p 1 F° 3 102369.16 90 10 3D°

4f( 2 F5/2)8Sl/2 ( S

/ 2,V2)

0 2 117949.15

3 117986.06

4/(2 Fi/2 )7d 2

[ 5 /2]° 2 118290.69 83 or 95 ( 2 F5/2)7d3/2 3 118588724 97 or 88 ( 2 F§/2)7ds/2 " 2[9/2 ] 0 4 118312.48 50 or 81 ( 2 FS/2 )7d3/2 5 118794-12 98 or 98 ( 2 F5/2)7d5/2 " 2 [7/2

]° 3 118318.07 97 or 88 ( 2F5/2)7d3/2 4 118476.74 50 or 81 ( 2 Fs/2)7d5/2 " 2

t 3 /2]° 2 118665.91 83 or 95 ( 2FI/2)7ds/2

1 118682.98 98 or 56 ( 2 Fs/2)7d3/2 " 2 [V2]° 0 100 or 100 ( 2FI/2)7ds/2

1 119043.35 98 or 57

4

( 2 F7/ 2 )85 1/2 ( 7 /2,V2)° 4 120199.11

3 12024922

4/(2 F7/2)7d 2 [9/2]° 4 120467.78 86 or 97 ( 2 F7/2)7d3/2 5 120646.18 84 or 52 ( 2F7/2)7d5/2 " 2[ 7

/ 2 ] 0 3 120652.44 55 or 99 ( 2F?/2)7d3/2 4 120685.11 86 or 97 ( 2 F?/2 )7ds/2 " 2

[ 5/2]° 2 120739.95 95 or 58 ( 2 F7/2)7d3/2 3 121001.44 55 or 99 ( 2 F7/2)7c?5/2 " v'hr 6 120845.67 100 or 100 ( 2F7/2)7c?5/2 5 121056.71 83 or 50 ( 2 F?/2)7d3/2 " 2 [3/2

]° 2 121095.78 95 or 58 ( 2 F?/2)7ds/2

1 121559.51 98 or 98

4f( 2 F!/2)5<7 2

t 9/2]° 4 122905.69 100 5 122908.89 100 "

2[ 11

/ 2 ] 0 6 122919.83 100 5 122922.37 100 " 2[ 7

/ 2 ] 0 4 12293221 100 3 12293338 100 " 2

[ 5

/ 2

]° 2 122976.30 100 3 122978.36 100 ” 2

t 13

/ 2

]° 6 12301029 100 7 12301 7.02 100 " 2

[ 3

/ 2

]° 2 123028.39 100

1 123029.01 100

4f( 2 F?/2)5^ 2

[ 11

/ 2

]° 6 125155.89 100 5 125158.97 100 " 2[9/2

]° 4 125164.86 100 5 125168.37 100

2

[ 13

/ 2

]° 6 125181.54 100

1 7 125186.61 100

225-298 0 - 78 -7
90

Ce III, Odd Parity—Continued

Configuration Term J

Level (cm -1

) 9 Leading percentages

4/( 2 F?/2 )5g 2

[ 7

/ 2

]° 4 125193.91 100 3 125196.03 100 " 2

[ 5

/2

]° 2 125230.90 100 3 125232.67 100 "

2[ 3

/ 2

]° 2 125268.40 100

1 12526929 100 » 2

[ 15

/ 2

]° 8 125270.97 100 7 125279.58 100

" 2

[

l / 2

]° 0 12529521 100

1 125296.65 100

Ce iv ( 2 Fs/2 ) Limit 162903
91

Ce IV

(Cs I sequence; 55 electrons) Z=58

Ground state (ls 2 2s 2 2p6 3s 2 3p6 3d 10 4s 2 4p6 4d 10 5s 2 5pfi ) 4/ 2 F°/2

Ionization energy 296470± 40 cm" 1 36. 758± 0.005 eV

Gibbs and White [1929] and Badami [1931] classified the 6s 2 S—6p

2 P° transitions, but

Badami’s extension of the analysis proved incorrect. The levels and interpretation given here

are due to Lang [1936a], who reobserved the spectrum with spark sources. He lists 31

classified lines in the range 443-2778 A. Lang commented that the 6d

2 D levels are “puzzling, as there seems to be no reason for

their inversion, but no other possibility could be found in the spectrum.” Reader has confirmed

the correctness of these levels. He suggests that their perturbation is probably due to interaction with one or more configurations of the type 5p5 4/n( (probably 5p5 4/5d and/or

5p5 4/6s).

On the basis of the accurate ionization potential [Sugar and Reader] and the general

behavior of ng series (in La in, for example), we find Lang’s level for 6g

2 G to be about 850 cm 1 above the expected position. Since a perturbation of this magnitude seems unlikely and

the level is based on two weak lines, we have omitted it here. The 5g

2 G level is based on four

combinations, and its quantum defect of 0.02 is in accord with similar spectra.

The four Zeeman patterns observed by van de Vliet for the 6s 2 S —6p

2 P° and 5/ 2 F°

7d

2 D lines are consistent with these classifications. The three g values we have derived from

his data are close to the theoretical single-electron values.

Edwin and King resolved the 140 Ce- 142 Ce isotope shift for each of the 6s 2 S —6p

2 P° lines

in Ce IV, using a pulsed hollow-cathode source; "... we believe this is the first time a fourth

spectrum has been obtained with emission lines narrow enough for high-resolution

measurements to be made on them.”

References

Badami, J. S., Proc. Phys. Soc. London 43, 53 (1931). EL CL

Edwin, R. P., and King, W. H., J. Phys. B 2, 260 (1969). IS

Gibbs, R. C., and White, H. E., Phys. Rev. 33, 157 (1929). EL CL

Lang, R. J., Can. J. Res., Sect. A 13, 1 (1935); Sect. A 14, 127 (1936a). EL CL W IP

Lang, R. J., Phys. Rev. 49, 552 (1936b). EL CL W

Reader, J., private communication (1975). Sugar, J., and Reader, J., J. Chem. Phys. 59, 2083 (1973). IP van de Vliet, H. J., Thesis, Univ. Amsterdam, 85 pp. (1939). ZE

[July 1976]
92

Ce iv

Configuration TermJ

Level (cm -1 ) 9

5p6( 1 S)4/ 2p° 5/ 2 0 7 /2 2253

5p6(>S)5d 2 D 3

/2 49737 5

/2 52226

5p6( 1 S)6s 2 S V2 86602 1.95 Sp^S^p 2P° V2 122585 0.65 3

/2 127292 1.36

5p6( 1 S)6d 2 D 5/2 177198 3/ 2

178913

SpTS^s 2 S V2 183502

5p6( l S)5/ 2 F° 5/2 18U5U5 7 /2 18h7h6

5p6 ( 1 S)7d 2 D 3 / 2

221661 5 / 2

221838

5p6( 1 S)8s 2 S 225128

5p6( 1 S)5p 2G 7

/2,9

/2 225625

Ce

V QSo) Limit 296470
(Xe i sequence; 54 electrons) Z=58

Ground state (ls 2 2s 2 2p6 3s 2 3pfi 3d 10 4s 2 4pfi 4d 10 5s 2

) 5

p

fi 1 S0

Ionization energy 528700± 2000 cm 1 65.55± 0.25 eV

The five excited levels derive from five transitions to the ground level (365 to 552 A).

Reader and Ekberg based the identifications on comparisons along the Xe I isoelectronic

sequence through La IV. We have listed the ,7=1 upper levels as belonging to J^-coupling

pairs, by analogy with La iv. Alternative Russell-Saunders names are given in the last column, the leading percentages for the 5p5 5d levels being from a preliminary calculation by

Hansen [1971].

Reader and Epstein derived the quoted ionization energy by using the 5p5 6s levels, an

estimated position for the 5p5 7s levels, and an assumed value for the difference between the

Rydberg denominators n*(7s)-n*(6s).

References

Hansen, J., unpublished material (1971). PT

Reader, J„ and Ekberg, J. 0., J. Opt. Soc. Am. 62, 464 (1972). EL CL W

Reader, J., and Epstein, G. L., J. Opt. Soc. Am. 65, 638 (1975). IP

[July 1976]

Ce v

Configuration Term J

Level (cm *) Leading percentages

5p

6 0 0

5p5

( 2p°/2 )5p 2

[ X /2]° 0 or 100 3p°

1 181116 or 93 3p°

5p5( 2Pa/2)5d 2P/2]° 2 or 75 3p°

1 207057 or 87 3D°

5p5( 2Pa/2)6s 2[3/ 2]

o 2 or 3p°

1 21>7396 or

ip°

5p5( 2Pi/2 )5d 2

[ 3 /2]° 2 or 51 3D°

1 250399 or 93 ip°

5p5( 2P!/2)6s 2

[

1 /2]° 0 or 3p°

1 2731+77 or 3p°

Ce vi ( 2PE/2 ) Limit 528700
94

Ce VI

(I i sequence; 53 electrons) Z-58

Ground state (ls 2 2s 2 2p6 3s2 3p6 3d 10 4s 2 4p6 4d 10

) 5s 2 5p5 2 P2/2

Ionization energy 626000± 10000 cm -1 77.6± 1.2 eV

Reader and Ekberg classified the two transitions from the 5s5p6 2 S 1/2 level to the 2 P°

ground-term levels, using comparisons along this isoelectronic sequence through La v. The

value for the separation of the 2 P° levels “is supported by additional measurements for

transitions to 5p5 2 P° from as yet uninterpreted upper levels.” The authors state that the

5s 2 5p4 4/ configuration is expected “not far above the ground configuration” and suggest that

the ground term is probably perturbed by interaction with this configuration.

Epstein and Reader derived the quoted ionization energy by an extrapolation based on the

data for this sequence through La v.

References

Epstein, G. L., and Reader, J., J. Opt. Soc. Am. 66, 590 (1976). IP Reader, J., and Ekberg, J. O., J. Opt. Soe. Am. 62, 464 (1972). EL CL W

[July 1976]

Ce VI

Configuration Term J

Level (cm -1

)

5s2

(

1 S)5p5 2 p° 3h 0

l h 2598

A

5s 5p

6 2 S V2 160416

Ce vii ( 3 P2 ) Limit 626000
PRASEODYMIUM

Pr I

59 electrons Z=59

Ground state (ls 2 2s 2 2p6 3s 2 3p6 3d 10 4s2 4p6 4d 10 5s2 5p6

) 4/ 3 6s2 4 Ig/2

Ionization energy 44070± 40 cm'1 5.464± 0.005 eV

Identified odd configurations 4/ 3 6s 2

, 4/ 3 5d6s, 4/ 2 6s 2 6p?, 4/ 2 5d6s6p, 4/ 2 5d2 6p?

Identified even configurations 4/ 2 5d6s 2

, 4/ 2 5d2 6s, 4/ 3 6s6p, 4/ 3 5d6p

The levels are from unpublished tables of Blaise, Verges, Wyart, Camus, and Zalubas

[1973a; 1973b], and Blaise and Ginibre [1976], who are extending this analysis. Zalubas and

Borchardt [1973] reported the lowest three levels of the 4/ 3 6s 2 4 I° ground term and about 60

upper even levels. The accuracy of the wavelength measurements for Pr i and Pr n is limited in general by

unresolved hyperfine structure. The line list for the region 4000 to 12000 A has about 25000

Pr i lines [unpublished list for Pr I and Pr n; see Zalubas and Borchardt], The list has been

extended to 3 p,m at the Laboratoire Aime Cotton, Orsay. Zalubas and Wilson [1964] give 3532

Pr i lines obtained in absorption in the range 1741-5839 A, and King’s [1928] list has 1018 lines of Pr i and Pr n between 3111 and 6828 A with temperature classifications. Most of the 1460

stronger lines of Pr i and Pr n given by Meggers, Corliss, and Scribner [1975] belong to Pr n;

the range is 2558-8715 A, and energy-level classifications are listed for both spectra.

The Zeeman patterns are also affected by hyperfine structure, with a resultant lowering

of the accuracy of the derived g values [Blaise et al., 1973b; Blaise and Ginibre, 1976]. Except

for the 4 I° ground term these are basically two-place values, although some values are given to the nearest 0.005. The more poorly determined g values are followed by colons, and values

obtained from ambiguous reductions of patterns are given with question marks.

Very accurate g values for the levels of the ground term have been determined by the

atomic-beam magnetic-resonance method. The values for the lowest three levels are from

Boklen, Bossert, Foerster, Fuchs, and Nachtsheim [1975], and the value for the 4 I°5/2 level is from Lew [1970], The values are rounded off to five decimal places from values given in the

references with uncertainties from 1.5 to 4 units in the sixth place. Lew’s [1953] original

determination of the J and g values for the 4 Ig/2 level were important in establishing 4/ 3 6s2 as the ground configuration of Pr I. The leading percentages for the ground-term levels are from

Conway and Wybourne [1963].

Although the lower levels of several of the most important configurations have been

identified, the interpretation of this spectrum is incomplete. The designations followed by

question marks are regarded as tentative. Blaise, Verges, Wyart, and Camus [1975] have

begun calculations for Pr I, and the percentages for the 4/ 3 5d6s levels are from their results. The interpretation of some of the low even levels is also based in part on preliminary

calculations. A more complete analysis and theoretical interpretation for Pr i will probably

involve calculations in alternate coupling schemes, e.g., J X J2 coupling for the 4/ 3 6s6p

configuration. We have included parentages for some of the designations given without

percentages. In some cases these are unique for the indicated order of coupling and final term,

in other cases only probable.

The hyperfine structures of the levels have to some extent proved useful in the analysis

[Blaise et al., 1973b]. Ginibre and Gerstenkorn [1970] began the theoretical and experimental

work at Orsay on this aspect of the Pr i spectrum. Murakawa [1960] classified the strong Pr i line at 4951.37 A and analyzed its hyperfine structure.
96

Pr I —Continued

Worden, Conway, Paisner, and Solarz [1977] obtained the ionization energy from two-step

photoionization threshold determinations carried out with laser techniques.

References

Blaise, J., and Ginibre, A., unpublished material (1976). EL ND ZE

Blaise, J., Verges, J., Wyart, J. F., and Camus, P., unpublished material (1975). PT

Blaise, J., Verges, J., Wyart, J. F., Camus, P., and Zalubas, R., J. Opt. Soc. Am. 63, 1315A (1973a). EL

Blaise, J., Verges, J., Wyart, J. F., Camus, P., and Zalubas, R., unpublished material (1973b). EL ND CL ZE Hfs

Boklen, K. D., Bossert, T., Foerster, W., Fuchs, H. H., and Nachtsheim, G., Z. Phys. A274, 195 (1975). ZE Hfs

Cabezas, A. Y., Lindgren, I. P. K., Marrus, R., and Nierenberg, W. A., Phys. Rev. 126, 1004 (1962). ZE Hfs Conway, J. G., and Wybourne, B. G., Phys. Rev. 130, 2325 (1963). PT

Ginibre, A., and Gerstenkorn, S., unpublished material (1970). Hfs PT

King, A. S., Astrophys. J. 68, 194 (1928). W

Lew, H., Phys. Rev. 91, 619 (1953). ZE Hfs Lew, H., Bull. Am. Phys. Soc. 15, 795 (1970). ZE Hfs

Meggers, W. F., Corliss, C. H., and Scribner, B. F., Nat. Bur. Stand. (U.S.), Monogr. 145, Part I, 403 pp. (1975). CL

Murakawa, K., J. Phys. Soc. Japan 15, 2306 (1960). EL CL Hfs Worden, E. F., Conway, J. G., Paisner, J. A., and Solarz, R. W., unpublished material (1977). IP

Zalubas, R., and Borchardt, B. R., J. Opt. Soc. Am. 63, 102 (1973). EL ZE

Zalubas, R., and Wilson, M., J. Res. Nat. Bur. Stand. (U.S.) 69A, 59 (1965). W

[January 1977]

Pr I, Odd Parity

Configuration Term J

Level (cm -1

) 9 Leading percentages

4/ 3 6s2 4 J

° 9

/2 0.00 0.73104 97 2

2H°2

11

1

2

1376.60 0.96515 99

13/2 281,6.75 1.10632 99

lS/2 4381.10 1.19799 99 1 2K°

4/3

(4 I°)5d6s(3 D) 6 L° n/2 8080.13) 0.63 95 2 ( 2H°2)(3D) 4 K°

l 3

/

2

8733.50 0.85 84 7 ( 4 I°)(3D) 4 L°

15h 9646.90 0.98 85 7 ( 4F)(3D) 4L

°

17/2 10720.45 1.06: 89 5 ( 4 I°)( 3D) 4 L°

19

/2 1191321 1.18 93 3 ( 4

I

0 )(3 D) 4 L°

21

/ 2 13198.74 99 1 ( 2K°)(3D) 4M°

4/3( 4 I°)5d6s( 3 D) 6 K

° 9

/ 2 825022 0.56 93 3 ( 4

I°)( 3D) 4 I°

11/2 8835.42 0.84 83 7 ( 4 I°)( 3D) 4 K

o

l 3

/

2

968424 0.98 85 8 ( 4I°)(3 D) 4 K°

15h 10669.00 1.13: 87 7 ( 4 I°)( 3 D) 4 K°

17/2 1176429 90 4 ( 4I°)(3D) 4 K°

19/2 12945.56 94 3 ( 4

I°)( 3 D) 6 L°

4/3( 4 I°)5d6s( 3 D) 4 L° 13/2 10410.80 0.805 43 40 CDCD) 4 L°

15/2 11814-70 0.97 48 37 (4I°)( 1 D) 4 L°

! 9/2 17/2 13280.47 1.08 54 36 ( 4 I°)( 1 D) 4L°

4/3( 4 I°)5d6s( 3 D) 4 K° 11/2 10431.75 0.800 38 33 ( 4F)(1D) 4K

o

1 S

/2 11746.36 0.97 50 30 ( 4

I°)( 1 D) 4 K°

15/2 13002.05

17/2 1434021

4/3

( 4 I°)5d6s(3D) 6J° 7

/2 9

/ 2 10936.67 0.80

11/2 11322.46 40 34 ( 4

I°)( 3D) 4 I°

1 S

/2 12222.10

15

/ 2 17

/2

4/2 5t/6.s6/j 6 K° 9/ 2 18125.55 0.615 4/2

( 3 H)5d ( 4 K)6s6p(3P°) 6 L° 11

1

2

18204-08 0.720
97

Pr I, Odd Parity—Continued Pr I, Odd Parity—Continued

Configuration Term J

Level (cm -1

) 9 Configuration Term J

Level (cm -1

) 9

n/2 18808.05 0.985 9

/2 23430.39

4/2( 3 H)5t/ ( 4 K)6.s6/X 3P°) 6 L° 13

/2 1882941 0.97 11/2 23475.11 0.965

9

/2 18886.11 0.80 15

/ 2 23488.64 1.02

4/2 5d6s6p 6K° ll/2 18934-89 0.885 n/2 23611.65 1.17

4/2 5d6s6p 6J° 7

/ 2 18987.10 0.64 n/2 2376722 0.925

4/2 5d6s6p 6J° 9

/ 2 19303.53 0.840 n/2 23923.09 1.04

4/2 5d6s6p i 3

/ 2 19315.96 7

/ 2 23984.06 0.88

4/’ 2

( 3 H)6.s2 6p?

41° 9

/ 2 19339.86 0.77 13

/ 2 24116.09 1.00?

11/2 19910.13 0.85 15/2 24156.54 1.09

11/2 20249.54 1.035 13

/ 2 24390.15 1.020

11

1

2031528 1.07 n/2 24406.45 0.86

4f

2 5rf6s6p?

6 K°? 13

/2 20339.47 1.05 ls

/2 24528.91 1.105

9

/2 20396.31 0.83 11/2 24534.39 1.00

4/2 5c/6.s6p?

4 L° 13

/2 20439.49 0.915 7

/ 2 25013.78 0.960

7

/ 2 20542.98 0.76 9

/2 25209.16 1.05

1X /2 20583.92 1.06 l 3

/2 25236.52 1.005

5

/ 2 20621.72 0.79 11/2 25250.67 0.980

15/2 20652.01 1.135 11/2 25280.40 1.11

7

/ 2 20873.94 0.84: l'3

/

25312.15 0.99

ll/2 2101327 0.84 n/2 25366.96 1.07

13

/ 2 21231.04 13/2 25382.49 1.145 n/2 21301.02 0.96: II /2 25461.73 1.07

5/ 2 21369.79 0.63

II /2 2555127 1.02

7

/ 2 21424.11 0.93

13

/ 2 25614.30 1.11

13/2 21466.44 1.05

9

/ 2 25657.85 0.98 H/2 21470.50 1.00

9

/ 2 25704.78 1.020

15/2 21655.15 1.14

9

/2 25729.03 1.025

13/2 21709.83 1.065

7

/ 2 25745.61 0.930 n/2 21813.11 1.05

9

/ 2 25814.85 1.020 4/2 5<f2 6p? 6 L° U/2 21969.49 0.64

13

/ 2 25843.56 1.055 4/2

( 3H)5d2

( 3 F) ( 5 L)6p? 6 M° 18/2

11

/ 2

21999.38 22577250.915

1.085

13

/ 2

9

/

25902.38 1.165 26006.18 1.055

1S/2 22670.12 0.92

9

/2 26083.73 0.98 4/2 5d2 6p? 6 L° 13/2 22786.54 0.95

S/2 26197.80 n/2 2281126 1.02

II /2 26310.93 1.04

13

/ 2 22831.71 1.105

13/2 26448.18 n/2 22850.99 1.025 n/2 26757.35 0.99 n/2 22881.44 0.98

II /2 2676620 1.26 n/2 22949.56 0.85 n/2 26824.75 0.825

1S/2 22974.55 1.080

9

/

26828.82 1.02

9

/

2308727 0.950

9

/

26908.65 0.945

ll/2 23207.53 1.050

9

/

27026.50 0.83

9

/

23280.09 1.060

II /2 27309.98 1.030

ll/2 23309.48 1.005

9

/

27331.71 1.00
98

Pr I, Odd Parity—Continued Pr I, Odd Parity—Continued

Configuration Term J

Level (cm *) 9 Configuration Term J

Level (cm' 1 ) 9

11 h 271,17921, 1.070 9/2 28675.30 1.050

11/2 27571.91 1.065 U/2 31728.1,9 1.040 n/2 27602.1,2 0.99 11/2 31787.07 1.01

13/2 27991.76 1.050 9

/2 32701,29

11/2 28168.72 1.20

9

/2 28501.82 1.120 FT II ( 4 I§/2)6Sl/2 ( 9

/2,

1 /2)4 Limit U070

Pr I, Even Parity Pr I, Even Parity

Level

Configuration J

Level

Configuration Term J

(cm' 1 ) 9 Term (cm 1 ) 9

4/ 2

( 3 H)5d6s2 4

I 9

/

2

443222 0.805 13

/2 10266.51 1.13:

11/2

13

/ 2

6313.23

7951.31

0.96

1.09

9

/2 10356.71

15/2 13/2 10423.68

4/2

(3H)5d6s2 4 K 11/2

13

/2

i5/2 17/2

4866.54 6603.60 8363.91*0.785

0.96

1.06?

11/2

5

/ 2

9

/ 2

10904.07

11107.69

11184.41

0.85

11

1

2

11282.89 1.080 4/2

( 3 H)5c/6s2 2H 9

/ 2

11

1 2

5822.87

6892.95

0.855

0.85

1S/2 11562.79

9

/2 11713.25 0.980 4/2

( 3 H)5</6s2 4 H 7

/2 6535.51 0.68

9 11944.19 /

2

8029.24 0.965

il/2 1.085

11

/ 2 9675.01 1.1 13/2 12041.67

13

/2

11 12 12180.13 1.095 4/2

( 3 H)5c/2( 3 F) ( 5 L)6s 6 L

11

/ 2 6714.22 0.81 11

/2 12234.62

13/2 7630.16 0.87

15/2 9

/

2

12746.10 1.140

17

/2 n/2 13035.75 19

/2 21

/2 13/2 13146.60

4

f

2 5d6s2 4G

7/2 7617.44 0.95

13

/2 13250.71

9

/ 2 13272.65 1.075 4/2 5c/2 6s 6

I 7/2 8013.14 0.46

9

/ 2 8643.83 4/3

( 4 I°)6s6p(3P°)? 6 K? 9

/ 2 13432.52 0.79 n/2 9268.75 1.040 ”/2 14178.40 0.910

13

/2 13/2 15156.11 1.0

15

/2

15

/2 16451.35 1.095

17

/2 n/2 17855.50 1.20

19

/ 2 19171.69 4/2

( 3 H)5c/2

( 3 F) ( 5 K)6s 6 K 9

/ 2 8320.27 0.54 U/2 8829.06 0.85 4/' 3

( 4 I°)6s6p( 3P°)? 6 I? 7

/ 2 13454.27 0.75

13/2 9464.43 1.01 9

/ 2 13974.75 0.91

15/2 10466.73 1.14: 11/2 14981.54 1.05

17/2

lS/2 16069.91 1.1

l 9

/

2

XS/2 17262.21

17/2 18557.11 n/2 9483.50

9

/ 2 13605.71 1.030 4/2

( 3F)5c/6s2 4 H 7

/ 2

9

/ 2

9918.17

10920.40

0.62

0.97 n/2 13727.51 n/2

7/2 13781.39 0.93

13/2
99

Pr I, Even Parity—Continued Pr I, Even Parity—Continued

Configuration Term J

Level (cm 4) 9

Configuration Term J

Level (cm -1

) 9

9

/2 13822.51 1.170 17/2 17695.16

7/2 13867.20 0.71 u/ 2 18144.32 0.945 “/2 13872.32 1.075 9

/ 2 18189.22

13/2 14087.60 1.065 u/2 18237.29 0.990

9

/2 14139.33 1.020 15

/ 2 18277.91

9

/

14186.39 1.00 U/2 18309.12 0.905

9

/

14261.56 1.11 17/2 18380.34

9

/

14272.91 1.01 1S/2 18466.97 1.30

9

/2 14468.33 1.00 15

/2 18548.53 1.14?

13/2 14470.09 9/2,U/2 18578.24

11 h 14505.11 0.97 9

/

18636.18 1.145

11

/ 2 14660.64 0.985 u/2 19122.57 1.025 n/2 14760.32 13/2 19212.72 1.145

9

/

14764.32 0.880 u/ 2 19343.25 1.06

15/2 14800.71 15/2 19364.58 n/2 15111.50 13

/2 19390.42 1.13

ll/2 15238.16 4/36s6p? 4 I? U/2 19474.75 0.94

13/

15372.31 1.055 15/2 19566.82 1.08? 4/2 5rf6s2?

2 I? U/ 2 15469.58 1.045 9/2,U/2 19620.04

9

/

15531.58 7/2 19654.58 0.95

11

1

15567.30 1.13 7

/

19749.10 1.075 4/3

( 4 P)6s6p(3P°)? 4 K? 13/2 15677.69 0.95 u/ 2 19820.69 0.995

!3/2 15772.58 U/2 19861.89 0.89

13/2 15850.49 9

/ 2 19871.16 1.12 U/ 2 15882.93 u/ 2 19920.36 1.040

1 1/2 15904.93 1.00 9

/

19963.96 1.010

15/2 15994.81 u/ 2 20089.26 1.035

11/2 16121.23 9

/

20154.60 1.225

13/2 16250.92 u/2 20171.75 1.09

15

/2 16294.40 4/3

( 4 I°)6s6p('P°)? 4 I? 9

/

20190.85 0.81 n/2 16316.49 u/ 2 20243.72 1.095

11/2 16377.47 7

/

20269.46 1.035

13/2 16626.91 u/ 2 20271.23

4/3 6.s6p? 15/2 16650.65 13/ 2 20290.58 1.15: U/2 16778.49 9

/2 20344.28 1.005

13

/ 2 16823.81 7

/

20167.38 0.88

11/2 16935.88 9

/

20476.66 1.08

!3/2 16979.04 1.10 9

/

20620.80 1.235 U/2 17405.54 1.05 13h 20622.75 1.03

4 K? ! 5/2 17429.98 ?/2 20653.36 1.185

11/2 17470.75 1.150 u/a 20731.90 1.17?

17/2 17494.45 7

/ 2 20792.13 0.975

! 3/2 17504.18 1.040 13/2 20798.25 1.05

4/3 6s6p? 4 K? U/2 17577.91 0.76 13/2 20827.15 1.005
100

Pr I, Even Parity—Continued Pr I, Even Parity—Continued

Configuration Term J

Level

( cm

* 1 ) 9 Configuration Term J

Level (cm* 1 ) 9

9

/2 20878.48 1.04 4/3 6s6p? 4 K? 15/2 22762.55 1.03

9

/2 20938.62 1.07

4/' 3

( 4 I°)5rf ( 5 L°)6p? 6 M? 13/2 22785.33 0.71 U/2 20943.42 1.180 1S

/ 2 23842.67 0.87 n/2 20982.95 1.135

17/2 25025.55 1.075

19

/ 2? 26313.78

7/2 21072.64 0.950 21/2

7

/ 2 21105.88 0.865

23/ 2? 29011.25 U/ 2 21120.69 1.135 9

/2 22921.34 1.08

13/2 21159.76 1.120 9

/ 2 22924.39 1.115

7

/

2

21211.48 1.045 4/3

( 4 I°)M ( 5 L°)6p? 6 L? U/2 23067.34 0.76 4/3

( 4 I°)6s6p? 4 K? 13

/2 21263.71 13/2 24073.41 0.99

is/2 25168.99 1.12

15

/ 2 21398.47 1.20: 17

/ 2? 26252.14

13

/2 21470.05 19

/ 2? 28613.84

21 /2? 28809.03 n/2 21471.81 1.010

7

/2 21513.28 1.18 4/3 6s6p? 4 I? 13/2 23085.08 1.11

7/2 21565.83 0.96 4/3 6s6p? 4G? 9

/ 2 23242.13 1.185 n/2 21612.66 1.07 4/3 6s6p? 4 K? U/2 23793.67 1.09

4

/

2 5d2 6s? 4 L? 13

/ 2 21618.49 0.850

9

/

2

23818.60 0.90

15

/2 21629.20 1.06:

13/2 23891.25 0.995

7/2 21649.64 0.88 4/3 5c/6p? 6 K? 9

/

2

23976.05 0.845 n/2 21677.15 1.00

13/2 23997.59 1.090

7

/2 21720.97 0.970 4/3 5d6p? 4 M? 1S

/ 2 24125.97 0.93

13

/ 2 21746.01 1.115

II/2 24136.57 1.105 n/2 21765.16 1.02 4/3 6s6p? 4 K? 17

/2 24195.13 1.16

13/ 2 21766.96 1.12 4/3 5<76p?

4 L? 13/2 24235.31 0.87

7

/

2

21789.99 1.150 U/2 24251.54 1.12

9

/

2

21795.17 1.06

1 3/2 24267.84 1.10

7

/

2

21961.01 1.025

41 /2 24307.52 0.97

7

/

2

22014.11 1.165 U/2 24312.05 0.86

7

/

2

22057.52 1.140 n/2 24333.76 1.10

15

/2 22088.82 1.09:

9

/

2

24441.81 0.995

13/2 22156.21 1.157

15/2 24472.97 1.11

7/2 22159.67 0.885

13/2 24555.04 1.035

7/2 22272.48 1.165

11

/ 2 24584.76 0.93

l 3

/

2

22416.15 1.11 4/3 5rf6p? 6 L? n/2 24590.84 0.680

7/2 22453.16 1.11

15/2 24634.79 1.075

n/2 22463.47 1.14: 4/3 5r/6p? U/ 2 24720.82 1.035

15

/ 2 22498.81 1.02

15

/2 24754.55 1.075

9

/ 2 22509.40 1.105 4/3 5c/6p? 6K? 11

1

2

24821.53 0.96

7

/ 2 22566.39 1.030

11/2 24906.70 1.07

9

/2 22694.60 1.03 4/3 5d6p? U/2 25006.96 1.030

17

/2 22700.89 1.175 4/3 5c/6p? 11

1

2

25097.82 1.01

13/2 22725.88 1.14 n/2 25279.18 1.10

ll

/2 22742.62 4/3 5c/6p? 4 L? 15/2 25321.60 1.03

9

/2 22761.90 1.110 4/3 5c/6p? n/2 25333.72 0.91
101

Pr I, Even Parity—Continued Pr I, Even Parity—Continued

Configuration Term J

Level (cm 1 ) 9 Configuration Term J

Level (cm -1

) 9

i 3

/2 25357.39 1.01 15/2 26932.88

13

/ 2 25454.41 1.040 15/2 26998.57 1.07:

9/2 25473.75 0.915 ll/2 27153.94 0.96

4/3 5f?6p? 6 L? 18/2 25498.90 0.975 4/3 5tf6p 17

/2 27201.91

13/2 25587.92 1.15 4/3 5<76p 13

/2 27213.98

4/3 5rf6p? 13/2 25608.77 1.050 4/3 5c/6p? 19

/ 2 ? 27404.55

17/2 25664.75 4/3 5d6p? 17

/2 ? 27523.18

4/3 5</6p? 4 M? 15/2 25781.55 0.97 15/2 27620.01 1.02

4/3 W6p? 6 K? 13

/ 2 25840.18 1.04 li/2 27634.52 0.94

15/2 25861.92 0.98 4/3 5c/6/j? 21 /2? 27634.53

13

/ 2

13

/2

25962.72 1.15

13

/ 2 27721.26 0.96 26107.27 1.040 4/3 5c/6p? 17

/ 2 27784.56 1.11

13

/ 2 26123.37 1.10 n/2 27869.73 1.27

13/ 2 26258.65 1.08 u/2 28054.35 1.060

l 3

/ 2 26297.91 n/2 28149.78 0.98

13

/ 2 26352.84 0.99

15

/2 28378.49 1.12 n/2 26357.24 1.04 n/2 28560.68 0.97

6 L?

9

/

26392.39 1.035 28906.27 15

/2 4/3 5c/6p? 15/2 26410.25 1.12 28917.29 1.10

6 K?

13/2 4/3 5f?6p? 13/2 26455.31 1.04 4P 5c/6p?

9

/26528.81 0.83

21 /2? 28964.07 4/3 5c/6p?

17h

21 /2? 29805.84 26565.32 1.13:

17

/2 30010.53

15/2 26654.48 1.02 4/3 5c/6p? 19

/ 2? 31172.71

4/’ 3 5c/6p?

4 K?

15

/2

I 3

/2

26710.33

4/ 0.97 3 5<76p? 26715.43

26784.33 Pr II ( 4

l9/2 )6si/ 2 ( 9

/ 2, l / 2 )4 Limit U070 H/2 0.89

1 1/2 26844.01
102

Pr II

(Ce i sequence; 58 electrons) Z=59

Ground state (ls 2 2s 2 2p6 3s2 3p6 3d l0 4s 2 4p6 4d 10 5s 2 5pfi ) 4/ 3

(

4 l9/2 )6s

Ionization energy 85100± 600 cm'1 10.55± 0.08 eV

Identified odd configurations 4/ 3 6s, 4/ 3 5d, 4/ 2 5d6p?

Identified even configurations 4/ 2 5d2

, 4/ 2 5d6s, 4/ 3 6p

In their 1941 paper Rosen, Harrison, and McNally noted the difficulty in analyzing the Pr

spectra, “both because of the complexity of this rare earth atom, and because many of its lines show hyperfine structure difficult to measure.” Their successful analysis of Pr n was helped

greatly by Zeeman-effect data obtained at magnetic fields up to 9.5 teslas (95000 gauss). They

gave 74 levels, including all the low odd levels of 4/ 3

(

4 I°)6s and of the 4/ 3

( 4 I°)5d 5 L° and 5 K°

terms. A number of the upper even levels were assigned to 4/ 3 6p. Schuurmans’ [1946]

independent analysis also yielded the low odd terms mentioned above.

Rosen at al. list more than 300 classified lines of Pr n (3650-7100 A), with Zeeman data

for about half of them. The wavelengths were taken from the M.I.T. tables [Harrison, 1969],

which have 2708 lines from the arc and spark spectra of Pr. The other main line lists are described in the preceding text for Pr i. About 13000 of the lines in an unpublished NBSOrsay list are believed to belong to Pr ii. The levels here are mainly from Blaise, Verges, Wyart, Camus, and Zalubas [1973], who

extended the analysis to include about 200 levels. Blaise and Ginibre [1976] have supplied a number of additional levels from their more recent work on this spectrum.

The data of Rosen et al., Blaise et al., and Blaise and Ginibre were used in compiling the g

values, with many of the values being averages of values from the first two sources. The

accuracy is usually limited by hyperfine structure; the most poorly determined g values are followed by colons. Values derived from uncertain reductions of Zeeman patterns are indicated

by question marks.

Wyart, Blaise, and Camus [1974] calculated (4/

3 6s+4/ 3 5d) for Pr n, and the percentages

for the 4/ 3 5d levels are from their unpublished eigenvectors [1975], The pairing of the eight

4/ 3

(

4 I°)6s levels into four /^'-coupling terms was first noted by Rosen et al.; we have

arranged the levels accordingly and listed the corresponding percentages from an unpublished

calculation of 4/ 3 6s [Sugar and Hagan, 1971]. The leading percentages in LS coupling from this calculation are also given, following the word “or.” The two separate calculations we have used

for 4/ :, 6s and 4/ 3 5d (only one of which includes the configuration interaction) are not very

inconsistent, because the configuration interaction is relatively small. Blaise et al. [1973] have shown that the lowest even levels belong to the (4/

2 5d2 +4/ 2 5d6s)

group, but a detailed interpretation with assignments to calculated eigenvectors has not yet

been made. Ginibre [1975] made a preliminary calculation 4/ 3 6p without configuration

interaction; the percentages for some of the higher even levels are from her results. Most of

the even levels are unassigned or have only tentative assignments, pending more complete

calculations and interpretation.

White’s [1929] measurements of the hyperfine structures of 173 Pr ii lines enabled him to deduce a nuclear spin of % and the occurrence of a single 6s electron in a low configuration.

Rosen et al. made some use of White’s data in their analysis, and most of the subsequent work

on hyperfine structure in Pr n has dealt with transitions to the 4/ 3

(

4 I°)6s levels. The hyperfine

patterns of a much larger number of Pr n lines could be resolved and conveniently recorded

with modern spectroscopic techniques; such data would very likely prove highly useful in obtaining a more complete analysis and interpretation of this spectrum.

Sugar and Reader derived the quoted ionization energy.
Pr II —Continued 103

References

Belyanin, V. B., Opt. Spektrosk. 4, 264 (1958). CL W Hfs

Blaise, J., and Ginibre, A., unpublished material (1976). EL ND ZE

Blaise, J., Verges, J., Wyart, J. F., Camus, P., and Zalubas, R., unpublished material (1973). EL ZE

Brix, P., Phys. Rev. 89, 1245 (1953). Hfs

Ginibre, A., unpublished material (1975). PT

Harrison, G. R., M.I.T. Wavelength Tables, 2d Edition, 429 pp. (M.I.T. Press, Cambridge, Mass., 1969). W

King, A. S., Astrophys. J. 68, 194 (1928). W

Murakawa, K., J. Phys. Soc. Japan 15, 2306 (1960). Hfs PT

Rosen, N., Harrison, G. R., and McNally, J. R., Jr., Phys. Rev. 60, 722 (1941). EL CL W ZE Hfs

Schuurmans, P., Physica (Utrecht) 11, 419 (1946). EL

Sugar, J., and Hagan, L., unpublished material (1971). PT

Sugar, J., and Reader, J., J. Opt. Soc. Am. 55, 1286 (1965). IP

White, H. E„ Phys. Rev. 34, 1397 (1929). W Hfs

Wyart, J. F., Blaise, J., and Camus, P., Phys. Ser. 9, 325 (1974). PT

Wyart, J. F., Blaise, J., and Camus, P., unpublished material (1975). PT

[January 1977]

Pr II

Configuration Term J

Level (cm -1

) 9 Leading percentages

4/ 3

( 4 II/2)6si/2 ( 9/2,V2)° 4 0.00 0.604 97 or 97 ( 4 I°) 5J° 5 441.95 0.875 90 or 58

4/3( 4 Ill/2)6Sl/2 ( n/2,V2)

0 6 1649.01 1.064 94 or 77 ( 4 I°) 5 I° 5 1743.72 0.860 91 or 59 ( 4 D 3J°

4/3

( 4 I?3/2)6Sl/2 ( 13/2,V2)° 7 2998.36 1.177 98 or 90 (41°) 5J° 6 340331 1.037 95 or 77 (41°) 3J°

4/3(4 I°)5c? 5 L° 6 3893.46 0.726 94 3 ( 2 H°2) 3 K°

7 5108.40 0.908 95 1 ( 2 H°2) 3K°

8 6417.83 1.05 97 1 ( 4 I°) s K

° 9 7805.61 1.12 98 1 ( 4 I°) 5 K°

10 9255.14 1.20 99 1 ( 2K°) 3M°

4/3( 4 I°)5c? 5 K° 5 4097.60 0.686 90 6 ( 4 I°)6s 3 I° 6 5226.52 0.911 95 2

0 Ci

l-H O 7 6413.93 1.05 96 1 ( 4 D 5 L

° 8 7659.76 1.15 06 1 ( 4 I°) 5 L°

9 8958.49 1.220 96 1 ( 4I°) 3 L°

4/3( 4 I!s/2)6.s„ 2 ( 15/2,V2)° 8 4437.15 1.250 99 or 99 ( 4 I°) 5I

° 7 5079.35 1.143 97 or 89 ( 4 I°) 3J°

4/2( 3 H)5c?2

( 3 F) 5 L 6 5854.61 0.71

4/2( 3 H)5c?2( 3F)? 5 I? 4 7227.99 0.62

4/3

( 4 I°)5c? 3J° 5 7438.23 0.880 59 11

O CA O 6 8465.04 1.035 47 19 (4n s r

4f3

( 4 l°)5d 5 I° 4 7446.43 0.631 89 8 (41°) 3H

° 5 8489.87 0.93 83 8 ( 4 I°) 3 H

° 6 9646.67 1.076 78 8 (4

I°) 3I° 7 11005.57 1.152 49 28 ( 4 I°) 3JO 8 11611.05 1.234 87 9 ( 4 I°) 3 K

°

4f3

( 4 l°)5d 5 H° 3 774437 0.52 73 12 ( 4 I°) 3Q°

4 8099.72 0.830 40 35 ( 4 I°) 3 H

° 5 9378.63 1.05 55 13 ( 4

i°) 3 r

6 10729.75 1.11 50 23 ( 4i°) 3I

° 7 12243.49 1.18 41 24 ( 4

I°) sp

4f

2 5</6s? 5

I 4 7832.43 0.61
104

Pr II

Continued

Configuration Term J

Level (cm" 1 ) 9 Leading percentages

4/2

( 3 H)5tf6s( 3D)? 5 7888.50 0.79

4/2

(3 H)5c/6s(3D)? 5 K? 6 8140.67 0.95

4f

2 5d6s? 5 8197.80 0.78

4/2

(3H)5d6s(3D)? 5 K? 5 8379.44 0.66?

4/2( 3 H)5rf2

( 3 F)? 5I? 5 8477.84 0.96:

4/3( 4 I°)5d 5G° 2 8965.63 0.37 92 3 ( 4G°) 5G°

3 9045.00 0.83 62 22 ( 4 I°) 3G°

4 10116.63 1.07 67 10 ( 4 I°) 3G°

5 11447.73 1.20 63 18 ( 4 I°) 3 H°

6 12826.94 1.285 64 17 ( 4 I°) 3 H°

4f3

(4 l°)5d 4 9128.67 0.91 39 5H° 23 ( 4I°) 3 H°

4/2 5d6s? 6 9211.93

4 9335.75 0.68?

5 9515.97

4fH3 H)5d2

( 3 F)? 5 I? 6 9532.52 1.03:

6 9670.81

4f2 5d6s? 7 9694.73

4/2 5d6s? 4 9767.98 0.85

4f3

(4 I°)5d 7 10030.31 1.14 44 *1° 32 ( 4 I°) 3 I°

6 10137.91

4f

3

( 4 I°)5d 3 K° 6 10163.47 0.930 55 13 ( 4 I°) 5 H°

7 11794.38 1.12 46 32 ( 4I°) 5 H°

8 13373.61 1.14 67 13 ( 2H°2) 3 K°

5 10466.42

4f3

( 4 I°)5d 5 10535.83 1.11 24 3H° 23 ( 4I°) 5 H°

4

f

2 5d6s? 7 10650.22

5 10801.81 0.97

4/2 5rf2

? 7 10987.23

4 11054.73

6 11088.79

7 11253.45

6 11283.14

4/2 5c/6s? 8 11310.15

4/3( 4 I°)5c? 3 L° 7 11418.52 0.897 80 10 ( 2K°) 3 L°

8 13029.09 1.013 81 11 9 14705.96 1.11 81 11

4/3

( 4 I°)5t? 6 11749.49 1.215 31 3 H° 25 ( 4I°) 5G°
105

Pr II

Continued

Configuration Term J

Level (cm' 1 ) 9 Leading percentages

4/2 5rf2? 5 11927.02

4,5 11943.32

4f

2 5rf6s? 6 12076.31

7 12237.15

4

5tf6s? 8 12545.18

7 12916.25

4/2 5t/2? 8 13021.35

6 13084.24

4/2 5rf6s? 7 13122.57 6 13216.22

4/2(3 H)5</6s( 3D)? 5 H? 3 13257.21 0.63

4/2 5d6s? 6 13365.03 4 13457.10

4/2

5rf2 ? 6 13472.64 1.07

4/2 5d6s? 9 13639.13 6 13776.80

7,8 14035.48

4,5 14095.02

4/ 2 5d6s? 4 14102.29

4,5 14167.90

7,8 14198.61

7 14307.12 9 14330.52 6 14416.81 5 14607.64

5,6 14745.85 1.04 4/2 5d6s? 8 14791.81

7 14810.97 5 14908.91 8 15087.16 5 15166.04

4/2 5c/6.s? 6 16243.01 4/2 5d6s? 4 16967.72 0.865 5 17676.04 0.945 7 18077.25 1.03 4 18470.25 6 18835.77 1.04 5 18910.11 0.95 4/2 5d6s? 4 19567.48 1.04 8 19721.75

4/2 5rf6s? 4 19845.37 0.988 6 19882.14 6 20114.95

! 7 20490.61 1.13

225-298 0 - 78 -8
106

i Pr II

Continued

Configuration Term J

Level (cm -1

) 9 Leading percentages

6 20554.30

5,6 21061.01

5,6 21131.26

4

P

5rf6s? 4 21462.00

6 21494.75

4/2 5c/6.s? 5 21676.12 1.000 6 21781.06

4 21971.46 0.84

5 22040.05 0.998 8 22184.27 5 22317.07 1.18

6 22472.04

5 22571.48 1.166

7 22660.77 1.03

4/3( 4 I°)6p 5 K 5 22675.44 0.830 6 24115.50 0.959 88 7 ( 4 I°) 3I 7 25569.19 1.07 91 5 ( 4

I°) 5I 8 27128.00 1.15 93 5 ( 4 I°) 5I 9 28816.25 1.221 99 1 ( 2 K°) 3 L

4 22686.69

6 22718.35 1.08 5 22885.59 0.997 6 23141.44 1.061

5 23261.36 0.920

6 23505.46

4 23527.90 1.025

5 23616.86 1.01?

5 23652.25 0.98

4/3( 4 I°)6p 5

I 4 23660.20 0.67 64 27 ( 4I°) 3 H

5 24716.04 0.913 74 14 ( 4 I°) a H

6 25656.69* 1.046 7 26860.95 1.119 60 27 ( 4

I°) 3 K

8 28201.95 1.160 65 27 ( 4 I°) 3 K

5 23712.63 7 23898.36 1.104

8 23970.47 1.14

6 23977.83 1.156 6 24393.73 0.97

4/3

( 4 I°)6p? 4 24754.95 0.908

7 24818.54 1.14

6 24835.03 1.01

7 25248.69 1.07

4 25467.47 0.90

4/3( 4 I°)6p? 5 25499.52 0.990

4 25545.04
107

Pr II

Continued

Configuration Term

........ J

Level (cm -1

) 9 Leading percentages

4/3

( 4 I°)6p 5 H 3 25578.49 0.55 97 2 ( 2H°2) 3G

6 25610.20 1.118 3 25762.81 0.86

4 25814.44 0.95 5 25842.41 1.000

5 26062.38 8 26139.77

4/3( 4 I°)6p? 5 26146.01 1.05

4/3( 4 I°)6p? 4 26226.56 0.91

4/3( 4 I°)6p? 6 26398.52 0.990

7 26445.11 1.065

6 26524.02 1.02

5 26640.86 1.05

5 26707.31 1.07

4/3( 4 I°)6p? 6 26961.96 1.076

5 26973.49 1.11

4/3( 4 I°)6p? 5 27198.24 1.07

5 27380.45 1.06

4/3

( 4 I°)6p? 6 27604.94 1.13 8 27781.69 1.075

4/3

( 4 I°)6p? 7 28009.80 1.12

6 28034.08

7 28172.96 1.14:

4/3( 4 I°)6p 3

I 6 28508.79 1.11 51 37 ( 4 I°) 5H

4/3( 4 I°)6p? 3 I? 7 28577.79 1.19 4/3

( 4 I°)6p? 8 29723.97 1.15 4/3

(4 I°)6p? 5 H? 7 30018.10 1.215 4/2

( 3 H)5d6p? 5 K°? 5 308U.63 0.74? 4/2 5d6p? 4 31775.93 0.78 4/2 5d6p? 5 32590.69 0.69: 4/2 5d6p? 5 33277.53 0.91 4/2 5d6p? 5 33387.62 0.93 4/2 5d6p? 4 33U0.49 0.83 6 33616.69 0.98 4/2 M6p? 5 33674.55 0.97 4/2 5c?6p? 4 3398123

4/2 5d6p? 6 34031.30 0.96 4/2 5d6p? 4 34322.69 0.80 6 35133.62

5 35220.91 0.89 5 35497.57

1 Pr III ( 4

I§/2 ) Limit 85100
108

Pr HI

(La i sequence; 57 electrons) Z=59

Ground state (ls 2 2s 2 2p6 3s 2 3p6 3d 10 4s 2 4pfi 4d 10 5s 2 5p6

) 4f

:t 4 F

o

9/2

Ionization energy 174407± 20 cm 1 21.624± 0.003 eV

Identified odd configurations 4/ 3

, 4/ 2 6p, 4/ 2 5/, 4/5d2

, 4/5d6s

Identified even configurations 4/ 2 5d, 4/ 2 6d, 4/ 2 6s, 4/ 2 7s, 4/ 2 8s

The levels are from Sugar’s analysis [1963, 1969], with a few additions and revisions

[Crosswhite, Crosswhite, and Judd, 1968; Sugar, 1974; Wyart, Blaise, and Camus, 1974]. There

are more than 3300 classified lines in the range 821 A to 10717 A. About 4400 lines are included in Sugar’s list [1974] for the range above 2107 A, and his 1969 paper has a table of

2948 lines in the range below this wavelength.

Rajnak’s eigenvectors were used to obtain LS percentages for the 4/ 3 configuration. The

compositions for (4/

2 6p+4/5d2 +4/5d6s), 4/ 2 5/, and 4/ 2 6d are from Sugar’s calculations [1969],

and those for 4/ 2 6s and 4f

2 5d are from Goldschmidt’s thesis [1968]. The second component

given in the last column is from the same eigenvector as that used for the designation, except

for the levels of the 4/ 2 5/ configuration. Although Jx l coupling is the preferred scheme for this configuration, Sugar found the LS character of the levels useful in making his first identifications. Hence the leading LS component for each 4/ 2 5/ level is listed instead of a second component from the Jx l scheme.

The strong configuration interactions within the (4/

2 6p+4/5d2 +4/5d6s) group [Sugar,

1969; Pasternak, 1970] are analogous to the interactions within Ce in (4/6p+5d2 +5d6s) found

by Goldschmidt.

The extent of the observed structure for Pr hi 4/ 3 (39 of the 41 expected levels have been

found) and the relative freedom from perturbation by other low configurations have made

possible the evaluation of other deviations from the intermediate-coupling approximation; a number of “effective interactions” and additional magnetic interactions applicable to f

N configurations were evaluated by fitting the observed 4/ 3 levels [Rajnak, 1965; Crosswhite et

al., 1968; Goldschmidt et ah, 1968; Pasternak, 1970],

The energy parameters derived by Feneuille and Pelletier-Allard [1968] for the Pr in

(4/ 2 5d+4/ 2 6s) and 4/ 2 6p configurations include effective interactions corresponding to “all two-particle operators, acting only upon the orbit of the electrons.” Wyart et ah [1974]

calculated (4/

2 5d+4/ 2 6s) with improved values for the parameters, and found two missing

4/ 2(

3 F)5d 4 D levels. These levels also agree well with the predictions of Goldschmidt [1968],

Judd [1968] cited the regularity of the observed intervals within each of several low Pr hi

4f

2 5d quartets as an example of a theorem he derived. The Lande rule is well obeyed by these

intervals despite overlapping of the terms. The smallness of the interactions between the

terms is due to the approximate equality of the spin-orbit parameters £(4/) and £(5d). This

equality also accounts for the regularity of the low lying 4/5d2 quartets [Sugar, 1969].

Reader and Sugar [1965] were able to derive a value for the nuclear magnetic moment of

141 Pr from the wide hyperfine structure of transitions to 4/ 2 6s levels. Sugar obtained a value of 174284 cm'1 for the Pr IV 4f

2 3 H4 limit by fitting a Ritz formula

to the 4/ 2

( 3 H)6s, 7s, and 8s levels. Sugar and Reader [1973] derived the quoted limit by

applying a correction known to be needed in this region of the periodic table.

Crosswhite, H., Crosswhite, H. M., and Judd, B. R., Phys. Rev. 174, 89 (1968). EL PT

Feneuille, S., and Pelletier-Allard, N., Physiea (Utrecht) 40, 347 (1968). PT

Goldschmidt, Z. B., Thesis, Hebrew Univ. Jerusalem, Israel, 487 pp. (1968). ND PT

Goldschmidt, Z. B., Pasternak, A., and Goldschmidt, Z. H., Phys. Lett. 28A, 265 (1968). PT

Judd, B. R., J. Opt. Soc. Am. 58, 1311 (1968). PT

Pasternak, A., Thesis, Hebrew Univ. Jerusalem, Israel, 219 pp. (1970). PT

References
Pr III

Continued ' 109

Rajnak, K., J. Opt. Soc. Am. 55, 126 (1965). ND PT

Reader, J., and Sugar, J., Phys. Rev. 137, B784 (1965). CL Hfs

Spector, N., J. Opt. Soe. Am. 54, 1359 (1964). ND PT

Sugar, J., Johns Hopkins Spectroscopic Rep. No. 22, 87 pp. (1961). EL CL W IP PT

Sugar, J., J. Opt. Soc. Am. 53, 831 (1963). EL Hfs IP PT

Sugar, J., J. Res. Nat. Bur. Stand. (U.S.) 73A, 333 (1969). EL ND CL W IP PT

Sugar, J., J. Res. Nat. Bur. Stand. (U.S.) 78A, 555 (1974). EL CL W

Sugar, J., and Reader, J., J. Chem. Phys. 59, 2083 (1973). IP

Trees, R. E., J. Opt. Soc. Am. 54, 651 (1964). PT

Wyart, J. F., Blaise, J., and Camus, P., Phys. Scr. 9, 325 (1974). EL ND CL PT

[July 1976]

Pr hi. Odd Parity

Configuration Term J

Level (cm' 1 ) Leading percentages

4/3 4I

o ®/2 0.00 97 2

2 H°2

il

/ 2 1398.3

99 1 2 H°2

13/ 2 2893.1 A 100

15/ 2 Jtlt53.76 99 1 2 K°

4/3 4 p

° 3

/2 9370.66 95 5

2 D°1

5

/2 10138.18 98 2

2 D°1

7

/ 2 10859.06 93 4

2G° 1 9

/2 11761.69 79 15 2 H°2

4/3 2 H°2 9

/ 2 10032.92 60 10 2G° 1 n/2 12494.63 82 13 2 H°1

4/3 4 S° 3

/2 1095024 95 4

2 p

°

4/3 ? /2 13887.60 41 2G°1 29 2G°2

4/3 4 G° 5

/ 2 14187.35 99

7

/ 2 15443.48 75 15 2G°1

9

/ 2 15705.13 55 17 2G° 1

ll

/ 2 1 7409.58 95 3

2 H° 1

4/3 2 K

° 18/2 16089.14 99 1 2

J

° 15 /2 1 7642.06 96 3

2 L°

4/3 9

/

16763.98 43 4 G° 30 2G°1

4/3 2 D°1 3

/ 2 17095.63 50 40 2p

° 5

/2 19046.09 98 2

4p

°

4/3 2 p

° 1 h 18693.65 95 5

4 D°

3 /2 20856.86 53 40 2 D°1

4/3 4 D° 3

/2 23091.70 82 15 2 D°2

5

/ 2 23245.99 81 18 2 D°2

l h 23465.43 95 5

2p

°

7 /2 24886.51 100

4/3 2 I° ll

/ 2 24357.98 84 14 2 H°1

13/2 25391.75 99 1 2 K°

4/3 2 L° 15/2 25244-61 97 3

2 K°

17 /2 26447.88 100

4/3 2 D°2 3

/2 26921.49 80 16 4 D°

5 /2 27597.13 77 19

4/3 2 H°1 9

/2 26979.66 87 11 2 H°2

ll

/ 2 28101.77 70 16 2 jo

4/3 2 F°2 7 /2 31787.93 82 17 2 F°1

5

/2 73 21
Pr III, Odd Parity—Continued

Configuration Term J

Level (cm -1

) Leading percentages

4P 2G°2 9

/

2

39225.60 59 41 2G°1

7

/2 39940.72 59 40

4

P

2 F°1 7 /2 53092.80 82 17 2F°2

5

/ 2 77 23

4/2

( 3 H4 )6pi/2

7

/ 2 58158.08 82 6 4/(2 F°)5d2

( 3 F) 4 H°

9

/ 2 581 74.15 95

4/2( 3 Hs)6pi/2 (5.V2

)° 9

/2 60166J20 79 7 ( 3 H4 ) (4,

3

/ 2

)° ll/2 60419.73 94

4/(2 F°)5d2

( 3 F) 7/ 2 60520.32 43 4 H° 33 ( 3F) 2G°

4/2( 3 H4 )6p3/2 (4,

3

/ 2

)° 9

/ 2 61357.04 53 19 4/(2 F°)5d2

( 3 F) 4 I°

7 /2 61605.66 80 7 4/(2 F°)5d2

( 3 F) 2G°

5

/2 61 71 7.98 72 18 ( 3 F2 ) (2,V2)° u/2 62240.83 40 35 ( 3 He) (6,V2)°

4/(2 F°)5d2

( 3 F) 41 ° 9

/ 2 62062.63 44 32 4/2

( 3 H4 )6p3/2

14 /2 63816.91 50 24 4/ 2

( 3 H.5 )(5p3/2 13

/ 2 65967.15 86 5 ( 3 F) 4 H°

15/ 2 68305.1 95

4/(2 F°)5d2

( 3 F) 9

/ 2 62535.62 33 2G° 27 ( 3 F) 4 H°

4/2( 3 He)6pi/2

41 /2 62558.67 55 37 ( 3 H4 ) (4 3

/ 2

)° 18/2 62678.70 89 6 ( 3 He) (6,

3

/ 2

)°

4/2( 3 F2)6pi/2 (2,V2)° 3

/2 6322138 91

S

/2 6357637 75 20 ( 3 H4 ) (4,

3

/ 2

)°

4/(2 F°)5d2

( 3 F) 4 H° 7 /2 63232.14 42 20 ( 3 F) 2G°

9

/2 64235.61 46 24 4/ z

( 3 Hs)6p3/2

“/

2

64865.15 73 15 4/2( 3 H5 )6p3/2

13

/ 2 66735.88 53 32 4/ 2

( 3 H6)6p3/2

4/2( 3 H5 )6p3/2 (5,

3

/ 2

)° 9

/

2

63593.35 67 11 4/(2 F°)5d2( 3 F) 4 H°

? /2 63768.66 47 34 ( 3 Fa) (3,V2)°

1S/2 64215.45 86 8 ( 3 Hs) (6,

3/2)°

4/(2 F°)5d2

( 3 F) U/2 64150.94 42 4 J° 39 4/2

( 3 H5 )6p3/2

4/2( 3 Fs)6pi/2 (3,V2

)° 5

/2 64401.03 75 7 4/(2 F°)5d2

( 3 F) 4 D°

7 /2 65295.90 45 39 ( 3 Hs) (5 3

/ 2 )°

4/(2 F°)5d2

( 3 F) 5

/2 6481 7.53 31 2jr° 27 ( 3 F) 4G°

4f2

( 3 F4 )6pi/2 (4,

l /2)° 9

/

2

64857.15 57 24 (>G4 ) (4.V2)

0

7 /2 64979.55 46 17

4/(2 F°)5d2

( 3 F) 4 G° 5

/2 65909.44 47 18 ( 3 F) 4 D°

7 /2 66852.87 47 18 4/ 2

( 3 F2 )6p3/2

9

/

2

68544.19 50 35 4/2

( 3P’3)6p3/2

11/2 69978.08 62 11 (

4 D) 2 H°

4/2( 3 H6 )6p3/2 (6,

3 /2)° 11/2 65922.43 88 4 4/(2 F°)5d2

( 3 F) 4 H°

1S/2 66148.40 51 25 4/(2 F°)5d2

( 3 F) 4 H°

ls

/ 2 66301.35 96

9

/ 2 67049.18 60 12 (>G4 ) (4,V2)°

4/(2 F°)5d2

( 3 F) 7 /2 6593535 22 2p° 12 ( 3 F) 4D°

4/2( 3 F2 )6p3/2 (2

,

3

/ 2

)° V2 66324-84 81 4 4/(2 F°)5d2

( 3 F) 2 S°

3

/2 66867.09 76 7 4/(2 F°)5d2

( 3 F) 4 F°

7 /2 67240.35 58 27 4/(2 F°)5d2

( 3 F) 4G°

5

/2 67395.32 44 22 4/(2 F°)5d2

( 3 F) 4 F°
Pr III, Odd Parity—Continued

Configuration Term J

Level (cm 1 ) Leading percentages

4/(2 F°)5d2

( 3 F) 4 jr° 3

/

76 10 4/2

( 3 F2)6p3 /2 5

/2 66681.lU 52 30 4y2

( 3 F2 )6p3 /2 ? /2 6767921 32 32 4/2

(

1 G4)6pi/2

9

/2 6968626 65 8 4y2

( 3 F4 )6pi/2

4/(2 F°)5d2

( 3 F) S

/2 669i3.CH 24 4 D° 14 4/2

( 3 F2)6p3/2

4/(2 F°)5d2

(

1 D) 9

/

67398.79 29 2 H° 20 ( 3F) 2H°

4/2( 3 F3 )6p3/2 (3

3

/ 2

)° 9

/

67870.76 48 26 4/(2F°)5d2

( 3F) 4G°

3

/

6796547 91

7 /2 68492.43 37 17 4/(2 F°)5d2

( 3 F) 4 F°

S

/2 68978.55 41 35 ( 3 F4 ) (4,

3

/ 2

)°

4/(2 F°)5d2( 3 F) 2 J

° n/2 68238.12 51 36 (1 G) 2J°

13 /2 7038148 53 29

4/(2 F°)5d2

( 3 F) 7

/

68331.73 22 4p° 21 4/2( 3 F3 )6p3/2

4/2 (*G4)6pi/2 9

/

68374.54 41 (4,V2)° 22 ( 3 F4 ) (4,V2)°

4/2( 3 F4)6p3/2 (4,

3

/ 2

)° ll/ 2 68525.62 53 20 0G4) (4,

3

/ 2

)°

4/2( 3 F4)6p3/2 7 /2 68801.67 29 (4,3

/ 2

)° 23 (!G4 ) (4,

3

/ 2

)°

4/(2 F°)5d2

( 3 F) 7 /2 68987.07 19 4 D° 15 ( 3P) 4G°

4/2( 3 F4)6p3/2 9

/

6913828 36 (4,

3

/ 2

)° 32 (!G4) (4,

3

/ 2

)°

4/(2 F°)5d2( 3 F) n/2 69W8.51 37 2 H° 25 (

J D) 2G°

4/(2 F°)5d2( 3 F) 7 /2 69 431.00 18 4 D° 17 ( 3P) 4 G°

4/(2 F°)5d2( 3P) 4G° 5

/2 69681.6 83 6 ( 3 F) 4 P°

9

/

71021.1 43 . 17 ( 3P) 2G°

7 /2 71385.6 58 24 (

4 D) 2G°

U/2 73609.1 76 9 ( 3 F) 2 H°

4/(2 F°)5d2( 3 P) 3

/2 71501.0 32 2 D° 25 ( 3 F) 4S°

4/2(

1 G4 )6p3/ 2 (4,3

/ 2

)° 5

/2 71536.38 61 28 ( 3F4 ) (4,

3

/ 2

)° 9

/2 71592.34 51 37 n/2 7173645 65 29

7

/

71978.52 48 38

4/(2 F°)5d2(

1 D) 5

/2 71994-81 26 2 D° 17 ( 3 P) 4 D°

4/(2 F°)5d2

( 3P) 9

/

73029.9 36 4G° 25 (1 G) 2 H

o

4/(2 F°)5d2(

1 G) 2 G° 7 /2 73378.42 65 9 ( 3P) 2G°

9

/

7576223 38 21 (

l G) 2 H°

4/(2 F°)5d2(

1 D) 2 G° 9

/2 73606.1

42 12 ('G) 2 H°

4/(2 F°)5d2

( 3 P) S

/2 741052 27 4 D° 23 ( 3 P) 4 F°

4/(2 F°)5d2( 3 P) 4p° 3

/2 74463.7 45 26 ( 3 F) 2 D°

5

1 2 62 12 ( 3P) 4 D°

7 /2 75294.0 74 7 ( 3P) 4 D°

9

/

85 6 ( 3 F) 4 F°

4/2(

1 D2)6pi/2 (2.V2

)° 3

/

75409.58 79 8 ( 3P2 ) (2,

1 /2)°

5 /2 75614.81 60 10 4/(2 F°)5d2

(

1 D) 2 D°

4/(2 F°)5d2( 3 F) 5 h 75560.75 35 2 D° 18 4/2

(

1 D2)6pi/2

4/(2 F°)5d2( 3 F) n/2 75640.00 32 2 H° 18 (‘D) 2 H°
Pr III, Odd Parity—Continued

Configuration Term J

Level (cm -1

) Leading percentages

4/(2 F°)5d2

( 3 F) 3

/2 768924 30 2 D° 27 (i D) 2P

°

4/(2 F°)5d2

(

1 G) 2 F° 5

/2 77822.00 70 5 ( 3 F) 2F°

7 /2 78463.6 58 20 4/2

(

1 D2 )6ps/2

4/2(

1 D2 )6p3/2 (2, 3

/ 2

)° V2 78312.91 68 11 ( 3P2 ) (2 3

/ 2

)° 3

/ 2 78889.1 A 76 8 ( 3Pa) (2,8/2)°

5

/2 79366.65 79 7 ( 8P2 ) ( 2, 8

/ 2

)°

? /2 79395.55 66 14 4/(2 F°)5d2

(

1 G) 2 F°

4/(2 F°)5d2

(

1 G) 2J° 1 V2 78694.57 35 25 (3 F) 2 P

18/2 7913623 51 26

4/2

( 3Pi)6pi/2 (l ,

l h)° V2 7971,2.36 79 12 ( 3Po) (0,V2)°

3

/2 80161t.01, 88 5 OD2 ) ( 2, 8

/2

)°

4/2 (>I 6 )6pi/2 ( 6//2

)° Xl /2 80360.82 80 6 4/(2 F°)5d2

( 3 F) 2 I°

18/2 80988.76 70 12 4/(2 F°)5d2

(

1 G) 2 I°

4/2( 3P2 )6pi/ 2 ( 2, 1 / 2

)° 3

/ 2 80897.85 75 7 PDa) (2,V2)°

5

/

2

81404.52 83 8

4/

2

( 3Po)6p3/2 ( 0, 3

/ 2

)° 3

/2 82492.4 44 35 4/(2 F°)5d2(

1 G) 2 D°

4/2

( 3 Pl)6p3/2 (l,3

/ 2

)° 3 /2 83025.91 43 23 ( 3Po) (0,8/2)° V2 51 35 ( 3Pa ) ( 2, 8

/ 2

)°

5 /2 83426.55 79 10 4/(2 F°)5c(2

(

1 G) 2 D°

4/2(

1 l6)6p3/2 ( 6

3

/ 2

)° xx

/ 2 83607.32 87 7 (Ge) (6,V2

)° X8/2 83703.43 87 11 (Ge) (6, 1 /2

)° 9

/ 2 84410.63 78 8 4/(2 F°)5d2

(

1 H) 2 H°

15/2 84992.04 98

4/5d(3 F°)6s 4p° 3

/ 2 84409.93 62 11 4/2

( 3Pi)6p3/2 5

/2 56 8 4/(2 F°)5d2( 3 P) 2 F°

7 /2 70 15 ( 3G°) 4G°

9

/2 88948.6 39 35 ( 3G°) 4 G°

4y2( 3 p2 )6p3/ 2 ( 2, 3/ 2

)° 7 /2 84430.98 85 9 (

4 D2 ) (2

,

3

/ 2 )°

1 h 47 37 ( 3Px) ( 1 , 8

/ 2

)° 3

/2 65 16 4/(2 F°)5d2(

1 G) 2P°

5

/2 85306.10 52 19 4/(2 F°)5d2

(

1 G) 2 D°

4/5d(3G°)6s 4 G° S

/2 87 7 (3 F°) 4 F°

7 /2 87511.6 52 26 (»G°) 2G°

9

/ 2 88220.2 57 35 ( 3 F°) 4 F°

“/

2

90119.8 96

4/5d(3 H°)6s 2 H° 9/2 906292 79 5 4/(2 F°)5d2

(

1 D) 2 H°

xx

/ 2 93296.5 80 9 ('H°) 2 H°

4/5d(3G°)6s 2 G° 7 /2 92441.7 53 21 ( 3 D°) 4 D°

9

/

2

95147.9 77 8 4/(2 F°)5d2

(

1 D) 2G°

4/(2 F°)5d2(

1 S) 2 F° 5

/ 2 92554-8 54 13 4/5d( 1 F°)6s 2 F°

7 /2 93967.4 74 4 4/5d(3G°)6s 2G°

4/5d( 1 F°)6s 2p° 5/2 50 10 ( 3D°) 2 D°

7 /2 96830.5 51 23 (3 F°) 2 F°

4/2( 3 H4 )5/ 2[ 6]° 11

/ 2 110295.1 83 or 74 ( 3 H) 4 K°

18/2 111110.3 87 or 59

" 2[4]° 7 /2 110333.5 91 or 81 ( 3 H) 4 H°

9

/2 110922.5 66 or 70 ( 3 F) 4 H°

" 2[7]° 18/2 110530.9 97 or 89 ( 3 H) 4 L°

X5/2 111335.1 82 or 67
Pr ill, Odd Parity—Continued

Configuration Term J

Level (cm' 1 ) Leading percentages

4/2

( 3 H4 )5/ 2 [5]° “/a 110881.1 78 or 41 ( 3 H) 2I°

9

/2 111993.0 72 or '58 ( 3 F) 2 I° " 2 [2]° 3

/2 111268.7 92 or 80 ( 3 H) 4 F°

5

/2 111 1,91,3 64 or 59 " 2[3]° 7 /2 11131)2.8 87 or 40 ( 3 H) 2G°

5

/2 63 or 52 ( 3 H) 4G°

4/2

( 3 Hs)5/ 2 [5]° “/a 11261,32 66 or 61 ( 3 H) 4 H°

9

/

113158.8 62 " 2[7]° 13

/ 2 112769.7 51 or 39 ( 3 H) 2I°

15

/ 2 112896.3 88 or 72 ( 3 H) 4 K°

" 2 [8]° 17/2 113023.5 94 or 94 ( 3H) 4 L°

15/2 113833.9 79 or 76 ( 3 H) 2 L°

" 2 [4]° 7

/

113291.8 50 or 44 ( 3 H) 4 F°

9

/2 113780.5 66 or 35 ( 3 H) 2 H°

" 2 [3]° 5

/2 113556.8 45 or 23 ( 3 H) 4 D°

7 /2 113630.9 46 or 51 ( 3 H) 4 G°

" 2 [6]° 13

/ 2 113600.3 49 or 43 ( 3 H) 2 K°

11

/ 2 113661,3 61 or 67 ( 3H) 4I° " 2 [2]° 3

/2 113825.5 93 or 45 ( 3 H) 2 D°

5

/

113911,-1 46 or 38 ( 3 H) 2 F°

4/2

( 3 He)5/ 2 [8]° 17

/ 2 111,725.6 95 or 95 ( 3 H) 4 K°

15/2 1156722 71 or 57 ( 3 H) 2 K°

" 2[6]° 13 /2 111,7972 69 or 48 ( 3 H) 4 H°

ll/2 1151,03.3 64 or 34 ( 3 H) 2 H°

" 2[9]° 19/ 2 111,970.7 100 or 100 ( 3 H) 4 L°

17

/ 2 116139.8 89 or 89 ( 3 H) 2 L°

" 2 t4]°

9

/2 115321,3 46 or 35 ( 3 H) 4 F°

" 2 [7]° is/ 2 1151,08.1, 64 or 60 ( 3 H) 4 I°

15/2 116238.8 78 or 72 ( 3 H) 4 I° " 7 /2 115120.8 36 2 [3]° or 35 ( 3 H) 4 D°

" 2 [5]° 9

/

1151,99.8 59 or 54 ( 3 H) 2G°

U/2 1159332 50 or 41 ( 3 H) 4G°

4/2

( 3 F2 )5/ 2 [4]° 7 /2 115670.0 89 or 82 ( 3 F) 4 H°

9

/2 1161332 52 or 54 ( 3P) 4 H°

4/2( 3 He)5/ 2 [3]° 5

/ 2 115800.0 48 or 47 ( 3 H) 2 D°

" 7 /2 116021.8 41 2 [3]° or 42 ( 3 H) 2 F°

4/2

( 3 F2 )5/ 2 [5]° 9/2 87 or 71 ( 3 H) 4 H°

n/2 1163092 63 or 31 ( 3 F) 4 I°

" 2 [3]° 5 /2 116727.1 66 or 50 ( 3 F) 4G°

7 /2 1170U-6 57 or 21

4/2( 3 F3 )5/ 2 [6]° 13/ 2 1172132 56 or 54 ( 3 F) 4 H°

n/2 117323.1 35 or 28 " 3

/2 11751,0.5 26 O

0 i-H C4 24 ( 3 F) 2P°
Pr III, Odd Parity—Continued

Configuration Term J

Level (cm’ 1 ) Leading percentages

4/‘*(»Fs )5/

2[5]° 9

/2 44 or 36 ( 3 F) 2 H°

n/2 1175 74.5 51 or 48 ( 3 F) 2 I° " 2[4]° 7

/

2

1176472 64 or 33 ( 3 F) 2 F°

9

/2 118081.1 40 or 36 ( 3 F) 2G°

" 2 [3]° 5 h 117686.4 33 or 42 ( 3 F) 4 D°

7 h 118318.6 60 or 41 ( 3 F) 2G°

4/2( 3 F4 )5/ l 3

/

2

117775.3 28 2 [6]° or 61 ( 3 F) 4 I° " 2[7]° 1S

/ 2 118063.0 70 or 65 ( 3 F) 4 I°

13

/

2

118610.9 36 or 55 ( 3 F) 2 I°

4/2( 3 Fa)5/ 2 [2]° S

/2 51 or 30 ( 3 F) 2 F°

3

/2 118201.4 59 or 34 ( 3 F) 4 F°

4/2( 3 F4 )5/ n/2 118271.6 22 to oi 0 0 32 ( 3 F) 4G°

4/2( 3 H4 )5/ 9

/2 118468.8 36 2 [5]° or 36 ( 3F) 4G°

"

”/2 118879.3 35 2 [5]° or 37 ( 3 F) 2 H°

4/2( 1 G4 )5/ 2 [6]° l®/2 120498.7 61 or 56 OG) ap

u/2 121532.5 35 or 31

" 2 [5]° “/2 1210952 45 or 40 (

4 G) 2 H°

9

/

2

121382.6 51 or 46

" 2[7]° 15/2 1211192 73 or 67 (‘G) 2 K°

13/2 1214312 50 or 44

4/2(

1 D2 )5/ 2[1]° 3

/2 1282142 84 or 83 (1 D) 2 P

° V2 89 or 88

" 2[5]° 9

/

2

128352.8 78 or 77 (!D) 2 H°

“/2 128381.6 89 or 88

" 2 [4]° 7 /2 1284532 87 or 86 (‘D) 2G°

9

/

2

128568.6 79 or 78

4/2(

1 Ie)5/ 2 [9]° 17

/ 2 133194-3 98 or 98 01) 2M°

19/2 133212.3 100 or 100

" 2 [8]° 15/2 1333522 98 or 98 (4 I) 2 L°

17

/2 133373.0 97 or 97

Pr iv ( 3 H4 ) Limit 174407
Pr III, Even Parity

Configuration Term J

Level (cm *) Leading percentages

4/2

( 3 H)5d 2 H 9

/2 12846.66 52 38 ( 3 H) 4

I “/2 14859.96 46 27

4/2( 3 H)5d 4 K U/ 2 13352.10 80

l3 /2 15454.16 95

15

/ 2 17534.76 100

17

/ 2 19649.67 100

4/2( 3 H)5d 4

I 9

/

14558.82 59 26 ( 3 H) 2 H

'V2 15525.50 68

l 3

/

17113.19 98

15/2 18921.24 98

4/2( 3 H)5d 4 G 5 /2 15045.80 50 25 ( 3F) 4G

? /2 16516.15 57 25

9

/

18063.36 56 25 n/ 2 19700.90 52 29

4/2( 3 H)5d 4 H 7

/ 2 16135.97 76

9

/ 2 17627.00 76 10 ( 3H) 4G

11/2 19308.93 85

13

/ 2 21238.78 77 13 ( 3 H) 2

I

4/2

( 3 H)5d S

/2 18211.76 34 2 F 21 ( 3F) 2F

4/2

( 3 H)5d 2

I 11/2 18241.54 47 16 0G) 2I 13

/

19360.10 50 19 ( 3 H) 4 H

4/2

( 3 F)5d 4 H 7 /2 18990.08 88

9

/ 2 20315.65 89

ll

/ 2 21755.84 88

13

/ 2 23175.09 71 15 ( 3 H) 2 K

4/2

( 3 H)5d 7 /2 19872.43 33 2 F 23 ( 3F) 2 F

4/2

( 3 H)5d 4 jr 3

/2 20160.36 78 16 ( 3F) 4 F

5

/2 20848.39 41 17 ( 3F) 4 G

9

/ 2 22747.69 49 13 OG) 2 H

4/2

( 3 F)5d 4 P 3

/2 21148.43 60 17 ( 3 F) 2P

V2 75 13 ( 3 F) 4 D

5

/2 21611.19 39 14 ( 3 H) 4F

4/2

( 3 H)5d 2 G ? /2 21294.89 38

9

/ 2 24788.02 48 15 ( 3F) 4F

4/2

( 3 F)5d 4 G 5

/2 21418.84 40 16 ( 3F) 4P

7

/

22080.94 40 27 ( 3 H) 4F

9

/ 2 23844.58 48 14 ( 3 H) 4G

14 /2 26095.23 42 24 PG) 2 H

4/2

(

1 G)5d 9

/ 2 21535.17 33 2 H 13 ( 3F) 4G

4/2( 3 F)5d 3

/2 22277.66 30 4 D 27 ( 3 F) 2 D

4/2( 3 H)5d 7 /2 22527.70 22 4p 16 ( 3 F) 4G

4/2

( 3 F)5d 4 D 3

/2 23050.61 30 23 ( 3F) 4P

5

/ 2 23751.57 76 10 OG) 2 F

V2 23955.37 66 28 ( 3 F) 2 P

7

/ 2 24470.90 69

4/2

(

1 G)5d 11/2 23442.25 35 2 H 22 ( 3F) 4G

4/2( 3 F)5d 5

/2 23532.86 23 4 F 15 ( 3H) 2 F

4/2

( 3 H)5d 2 K 1 S

/2 23647.77 71 19 ( 3F) 4 H

15/2 25979.34 86 11 OD 2 K
Pr III, Even Parity—Continued

Configuration Term J

Level (cm 1 ) Leading percentages

4/2(‘G)5d 7

/ 2 23651.88 24 2G 17 (

X G) 2 F

4/2( 3 F)5d 4 p 3

/2 24250.62 38 20 (3F) 2P

S

/2 24461.24 43 18 ( 3F) 2 D

7 /2 26446.97 34 21 ( 3 H) 2 F

9

/

2

27604.26 56 26 (

X G) 2G

4/2( 3 F)5d 3

/2 24309.20 28 4 D 26 ( 3F) 2 P

4/2(

1 G)5d 9

/

2

25033.91 36 2G 33 ( 3 H) 4F

4/2( 3 F)5d 7 /2 25409.74 30 4 p 25 (

4 G) 2G

4/2

(

1 G)5d 5

/

2

25934.98 18 2 D 17 (3 F) 2 F

4/2( 3 F)5d 2G 7

/

2

27138.55 42 17 (*D) 2G

9

/

2

28720.71 52 15 ( 3 F) 2 H

4/2(

1 G)5d 2

I 11/2 27380.31 64 17 ( 3 H) 2

I

l 3

/2 29263.08 68 22

4/2(i G)5d 2 D 5

/

2

27452.45 56 27 ( 3F) 2 D

3

/2 28936.46 66 18

4/2( 3 H4 )6Sl/2 (4,i/2 ) 7 /2 28399.43 97

9

/

2

28885.14 93

4/2

(

1 G)5d 2 F

5

/2 29267.86 55 23 ( 3F) 2 F

4/2( 3 F)5d 2 H 9

/

2

29835.09 37 27 (

4 G) 2 H

H/2 30505.72 57 19

4/2(3 Hs)6S1/2 (5,‘M 11/2 30733.53 98

9

/

2

30994.55 95

4/2(iG)5d 7 /2 31254.71 35 2 F 27 ( 3 F) 2 F

4/2(iD)5d 2 S

1 / 2 31803.70 68 19 ( 4 D) 2P

4/2 (iD)5d 2 P 3

/2 32288.92 73 17 ( 3P) 2P

V2 34198.61 68 25 ( X D) 2 S

4/2( 3 H6 )6Sl/2 (6,1/2) is/ 2 32760.11 100 H/2 33466.41 97

4/2( 3 F2 )6s 1 /2 (2,1/2) 3

/

2

33338.37 98

5

/2 33659.99 89 9 ( 3 Fa) (3,Va)

4/2(i D)5d 2 F

5

/2 34520.27 53 18 ( 3P) 4 F

7

/

2

36640.38 39 22

4/2( 3 F3 )6si/2 (3,‘/2) 7 /2 34825.49 89

5

/2 35384.17 91 9 ( 3 F2 ) (2,

1 /*)

4/2(i D)5d 2 G 7 /2 35024.49 48 19 ( 3F) 2G

9

/2 35828.46 54 22 ( 3P) 4 F

4/2( 3 P)5d 3

/2 35137.82 32 4 p 31 (‘D) 2 D

4/2

( 3 F4 )6Sl/2 ( 4, 1 / 2 ) 9

/2 35291.00 69 30 (

l G4 ) (4,Va)

7 /2 35801.12 50 39

4/2( 3 P)5d 4 p

3

/2 35863.74 65 12 ( 3P) 2 P

5

/2 36652.29 80 11 (

4 D) 2F

7

/

2

37919.58 61 23 (‘D) 2 F

9

/

2

39024.27 73 16 (*D) 2G
Pr III, Even Parity—Continued

Configuration Term J

Level (cm -1

) Leading percentages

4/2 0I)5d 2

I i3/2 36642.13 69 26 (

X I) 2 K

n/2 36670.57 92

4/2( 3P)5d 4 p

X /2 36683.21 57 35 ( 3P) 2P

3

/ 2 37197.64 40 32 OD) 2 D

S

/2 38694.51 50 23 (

X D) 2 D

4/2( 3 P)5d S

/2 37011.92 41 4p 39 (>D) 2 D

4/2

(

1 G4 )6si,2 (4,

1 / 2 ) 9

/2 38448.38 68 30 ( 3 F4 ) (40/2)

7 /2 38726.50 57 42

4/2( 3 P)5d V2 38549.90 35 4 D 30 ( 3P) 4 P

4/2(

1 I)5d 2 K 1S/2 38701.59 63 28 01) 2

I 15 h 38785.76 72 16 01) 2 L

4/2( 3 P)5d 4 D 3

/

39120.49 56 22 ( 3P) 4 P

X /2 39485.48 57 34 ( 3P) 2 P

5

/

40098.66 71 19 OD) 2 D

1 h 41023.98 85 11 (X D) 2 F

4/2(>I)5d 2 L 15/2 39725.99 83 16 (

X I) 2 K

17/2 41026.87 100

4/2( 1 I)5d 2 H X1 /2 39732.99 86

9

/

39870.17 81

4/2( 3P)5d 3

/

40205.74 32 2P 29 ( 3P) 4 D

4/2

( 3 P)5d

2 F 7 /2 44679.98 77 10 ( 3 F) 2 F

5h 44903.42 71 12 (

X D) 2F

4/2(

1 I)5d 2 G 9

/

45805.95 94

7 /2 46673.78 98

4/2(

1 D2 )6sx/2 (2,V2 ) S /2 45807.1 88 9 ( 3P2 ) (2,

x / 2) 3

/

45844.65 90 8

4/2( 3 P)5d 2 D 3

/

48401.64 90

5 h 48745.48 87

4/2

( 3Pi)6si/2 (l, 1 /*)

3

/2 50227.79 97

X /2 50869.3 86 14 ( 3Po) (0,

X / 2 )

4/2

(

1 Ie)6si/2 (6,X

/ 2 )

1 1/2 50647.35 100

13 /2 50658.72 100

4/2( 3P2 )6si/2 (2,

x /2)5

/2 51312.8 91 9 (

x D2 ) (2,x / 2 ) 3

/

52026.9 90 7

4/2( 3 H4 )7si/2 (4,

1 / 2 ) 7 /2 9

/

100321.12

4/2( 3 H4 )6d3/2 (4

3

/ 2 ) 9

/

100430.29 96

Xi/2 100625.04 96

? /2 100788.95 65 31 ( 3H4) (4,5

/ 2 ) 5

/

101071.43 50 45 ( 3 H4 ) (4,

5

/ 2 )

4/2( 3 H4 )6ds/2 (4,

5

/2) 9

/

100947.18 94 H/2 101165.33 94

7 /2 101446.27 64 28 ( 3H4) (4,3

/ 2 ) 3

/

97

5

/ 101665.58 52 43 ( 3 H4 ) (4,

3

/ 2 ) 18/2 101680.38 84 10 ( 3 Hs) (5 3

/ 2 )

4/2( 3 Hs)7si/2 11/2 102435.67

9

/

102484.66
Pr III, Even Parity—Continued

Configuration Term J

Level (cm' 1 ) Leading percentages

4/2( 3 Hs)6d3/2 (5,3

/2 ) n/2 102617.24 95

9

/2 102830.43 79 18 ( 3 Hs) (5,

5

/ 2 ) 13

/ 2 102981.94 51 47 ( 3 Hs) (5,

5

/i) V2 103308.53 93

4/2

( 3 Hs)6ds/2 (5,

5

/2 ) 9

/2 103335.06 74 18 ( 3 Hs) (5,

3

/ 2 ) u/2 103344.35 96

15/ 2 103484.19 95

18/ 2 103805.38 48 39 ( 3 H5 ) (5,

3

/ 2 ) 7

/2 103895.83 95

5

/2 94

4/2( 3 H6 )7si/2 (6,V2) 13

/ 2 104598.99 n/2 104788.68

4/2( 3 He)6d3/2 (6

,

3

/ 2 ) ll/ 2 104904.55 93

is/2 105019.06 86 13 ( 3 He) (6,

5

/ 2 ) 9

/

2

105566.62 96

15/ 2 54 41 ( 3 He) (6,

5

/ 2 )

4/2

( 3 He)6d5/2 (6,

5

/ 2 ) 15 /2 105049.72 57 42 ( 3 He) (6,

3

/ 2) n/2 105450.18 82

17 /2 100

13/ 2 105632.16 85 12 ( 3 He) (6,

3

/ 2 ) 9

/2 69 19 ( 3 F2 ) (2,

5

/ 2 ) 7 /2 86 5 ( 3 F3 ) (3,

3

/ 2 )

4/2( 3 F3 )7si/2 (3,V2) Vi 106665.07

5

/2 106745.65

4/2( 3 F4 )7si/2 (4,Va) 9

/2 107081.94

? /2

4/2( 3 F3)6d3/2 (3

,

3

/ 2 ) 7 /2 107299.07 64 8 ( 3 F4 ) (4,

3

/ 2 )

4/2

( 3 F4 )6d3/2 9

/

2

107854.46 32 (4,

3

/ 2 ) 20 ( 3 F3 ) (3,

3

/ 2 )

4/2( 3 F4 )6ds/2 (4,

5

/ 2 ) ll /2 108559.40 42 21 (

1 G4 ) (4,5

/ 2 )

4/2( 3 H4 )8si/ 2 (4,

1 /a) Vi

9

/a 129106.1

4/2

( 3 Hs)8si/2 (5,V2) u/2 131200.3 Vi 131226.3

4/2( 3 H6 )8si/2 (6//2 ) 1 3

/ 2 133393.2 n/2 133503.9

4/2( 3 F3)8si/2 (S.Va) Vi 135445.2 Vi

4/2( 3 F4 )8si/2 (4,Va) Vi 135868.8 Vi

Pr iv ( 3 H4 ) Limit 174407
119

Pr IV

(Ba i sequence; 56 electrons) Z=59

Ground state (ls 2 2s 2 2p6 3s 2 3p6 3d 10 4s 2 4p6 4d 10 5s 2 5pfi ) 4/ 2 2 H4

Ionization energy 314400± 200 cm'1 38.98± 0.02 eV

Identified even configurations 4/ 2

, 4/5/, 4/6p, 5d

2

Identified odd configurations 4/5d, 4/6d, 4/6s, 4/7s, 5d6p

Sugar [1965, 1971a] and Crosswhite, Dieke, and Carter [1965] have observed this spectrum

as emitted by sliding-spark discharges. The line lists in the two 1965 references overlap up to 3021 A, and Sugar’s additional list of classified lines [1971a] extends downward to 691 A. The

analysis is from these three references. The two 1965 papers are in agreement on all levels of

the 4/ 2

, 4/5d, 4/6s, and 4/6p configurations, except for 4/ 2 and an interchange of

designations for three pairs of 4/5d levels. The two-place level values are from Crosswhite et

al. It is not clear that these values are more accurate than the one-place values of Sugar,

however, from which they differ by up to 0.3 cm' 1

. The 4/ 2 'Sn level of Crosswhite et al. has

been omitted as doubtful [Morrison and Rajnak, 1971], and Sugar’s designations for the 4/5d

levels are preferred as supported by calculations. The levels of the remaining configurations

are taken from Sugar [1971a], with the two possible 5d

2 levels he judged as doubtful being

omitted.

The compositions of the 4/ 2 levels are from Goldschmidt’s thesis [1968], Her calculation was later refined to include additional magnetic interactions, but the eigenvectors were

essentially unaffected [Goldschmidt, Pasternak, and Goldschmidt, 1968; Pasternak, 1970],

Theoretical percentages for levels of the 4/6s, 4/6d, and 4/5/ configurations are taken from

Sugar’s publications, supplemented by some of his unpublished results for alternate coupling

schemes. Sugar recalculated for inclusion here the eigenvectors for the 4/5d and 4/6p

configurations, with energy matrices including the appropriate effective interactions.

Goldschmidt, Salomon, and Starkand [1974] have made similar calculations of 4/5c? in Pr IV, Ce hi, and La n. The average purity of the 4/5/ configuration in the jl l coupling scheme is only slightly

greater than in the LS scheme, but the former is preferred because none of the LS

designations 'F, 'G, and is the leading component of any level. The 4/6p configuration

exhibits strong jj2 coupling, and in the 4f6d configuration the / value of the 4/ core is defined

with greater than 90% purity for every level. Thus “no strong combinations involving a change

of the 4/ core level were observed” in the 4/6p-4/6d transition array [Sugar, 1971a],

Sugar [1971a] obtained a value for the ionization limit based on the 4/6s, 7s series. Sugar

and Reader [1973] have revised the value using a semi-empirical method and knowledge of the

system differences 4/ w -4/ iV “ 1 5d.

References

Crosswhite, H. M., Dieke, G. H, and Carter, W. J., J. Chem. Phys. 43, 2047 (1965). EL CL W Hfs

Goldschmidt, Z. B., Thesis, Hebrew Univ. Jerusalem, Israel, 487 pp. (1968). PT

Goldschmidt, Z. B., Pasternak, A., and Goldschmidt, Z. H., Phys. Lett. 28A, 265 (1968). PT

Goldschmidt, Z. B., Salomon, D., and Starkand, J., unpublished material (1974). PT

Morrison, J. C., and Rajnak, K., Phys. Rev. A 4, 536 (1971). ND AT

Pasternak, A., Thesis, Hebrew Univ. Jerusalem, Israel, 219 pp. (1970). PT

Sugar, J., J. Opt. Soc. Am. 55, 1058 (1965). EL CL W PT

Sugar, J., J. Opt. Soc. Am. 61, 727 (1971a). EL CL W IP PT

Sugar, J., unpublished calculations (1971b). PT

Sugar, J., and Reader, J., J. Chem. Phys. 59, 2083 (1973). IP

[July 1976]
120

Pr IV

Configuration Term J

Level (cm -1

) Leading percentages

4/2 3 H 4 0.00 97 5 2152.09 100 6 4389.09 100

4/2 3 F 2 4996.61 98 3 6415.24 100 4 6854.75 66 33 >G

4/2 X G 4 9921.24 65 34 3 F

4/2 X D 2 17334.39 90 8

3P

4/2 3 P 0 21389.81 99

1 22007.46 100 2 23160.61 92 8

X D

4/2 *1 6 22211.54 100

4/5d 1Qo 4 61170.95 63 or 70 ( 5

/2,3/2)°

4/5d 3 F° 2 6145 7.48 69 or 95 ( 5

/2,3/2)° 3 64123.54 82 or 67 ( 5

/2,5/2)° 4 66518.01 73 or 91 ( 7

/2,5/2)°

4/5d 3G° 3 63355.94 77 or 85 ( 5

/2,3/2)° 4 65639.95 87 or 58 ( 7

/2,3/2)° 5 67899.32 98 or 70 ( 7

/ 2,5

/ 2

)°

4/5d 3 H° 4 63580.59 68 or 40 ( 5

/2,5/2)° 5 65239.39 100 or 52 ( 5

/2,5

/ 2

)° 6 68077.83 100 or 100 ( 7

/2,5 /2)°

4/5d i D

° 2 65321.67 61 or 58 ( 5

/2,5 /2)°

4/5d 3 D° 1 66967.72 95 or 63 ( 5/2,3/ 2

)° 2 68411.51 92 or 55 ( 7

/2,3/ 2

)° 3 68495.57 67 or 59 ( 7

/2,3/ 2

)°

4/5d 3 P° 1 70755.33 93 or 70 ( 5/2,5/ 2

)° 0 70842.93 100 or 100 ( 5

/2,5

/ 2

)° 2 72185.10 94 or 54 ( 7

/2,5/ 2

)°

4/5d iF° 3 71724-77 65 or 95 ( 7

/2,5/ 2

)°

4/5d >H° 5 75265.66 98 or 35 ( 5

/2,5/2

)°

4/5d i P

° 1 78776.38 92 or 83 ( 7

/2,5/ 2

)°

4/( 2 F5/2)6sl/2 ( S

/2,

1 /2

)° 2 100258.48 100 or 100 3F°

3 100543.85 99 or 69 3 F°

4/(2 F?/2)6si/2 ( 7

/2,

1 /2)° 4 103271.38 100 or 100 3 F

° 3 103753.75 99 or 69 iF°

4/(2 FI/2)6pi/2 ( 5

/2,

1 /2 ) 3 136850.85 98 or 59 3G

2 137175.04 94 or 69 3F

5d

2 3 F? 2? 139711.8

3

4 145362.7

4/(2 F?/2 )6Pi/2 P/s.Va) 3 139875.31 93 or 53 3 F

4 140225.92 96 or 41 3G

4/( 2 F5/2)6P3/2 ( 5

/2,3/2) 3 141254.01 94 or 39 3G

2 142331.59 95 or 54 3 D

4 142565.94 93 or 56 3G

1 142997.32 100 or 100 3 D
121

Pr IVContinued

Configuration Term J

Level (cm -1

) Leading percentages

A( 2 F7/2)6p3/2 ( 7

/2,3

/2) A 144925.33 90 or 55 l G

3 144943.27 94 or 65 3 D

5 145281.20 100 or 100 3G

2 146577.13 99 or 64 *D

4f( 2 F5/2)6d3/2 ( 5

/2,3

/ 2

)° 2 193330.5 93 or 75 3F°

4 193601.8 98 or 72 3 H°

3 193805.1 83 or 92 3G°

1 55 or 92 3 D°

Af( 2 F§,2 )6ds/2 ( 5/2, 5/2

)° 4 191*022.2 98 or 44 3G°

3 80 or 71 3 F°

2 90 or 44 3 D°

5 191*777.21 91 or 78 3 H°

0 100 or 100 3p°

1 56 or 84 3P°

5d6p 3 F° 2

3

4 195917.0

Af( 2 F7/2)6d3/2 ( 7

/ 2,3

/ 2 )° 4 196581*.7 99 or 51 3G°

3 95 or 38 3 D°

2 54 or 54 3 D°

5 198301*. 7 48 or 81 i H

°

4/(2 F7/2)6d5/2 ( 7

/2,5

/2 )° 4 196800.0 100 or 63 3 F°

5 197103.7 55 or 85 3G°

6 197196.9 100 or 100 3 H°

2 54 or 88 3P°

3 198155.1*1 99 or 53 3 D°

1 96 or 77 i P

°

4/(2 Fs/2 )5/ T/G 3 199191.0 86 or ‘ 70 3G

4 200202.6 69 or 87 3G

" 2

[ 11

/ 2] 5 199595.8 68 or 57 3

I 6 200893.8 79 or 90 3

I

Af( 2 Fi/2)7si/2 ( 5

/2,

1 /2)° 23 199727.7

4/( 2 Fg/2 )5/ 2 P/2] 1 199815.5 87 or 64 3 D

2 200697.1 55 or 89 3D

" 2

[ 9

/ 2 ] 5 200235.1 57 or 39 3

I 4 201985.3 85 or 82 3 H

" 2

[ 5

/ 2 ] 3 200417.0 73 or 36 3 D

2 202819.0 74 or 71 3 F

" T/2] 1 201365.2 70 or 55 3 S

0 89 or 87 3P

Af( 2 F?/2)5f

2

[ 9

/2] 5 202327.9 84 or 73 3G

4 204541.7 55 or 43 3 F

5d6p ip° 3 2021*87.0

Af( 2 F?/2)5f

2 P/2] 3 202614.7 67 or 54 3D

2 205541.6 74 or 50 »D

" 2[l 3

/ 2 ] 7 202948.9 100 or 100 3

I 6 206299.4 70 or 88 G

" 2

t 3 /2] 1 203265.4 52 or 51 J P

2 207046.3 84 or 72 3P

225-298 0 - 78 -9
Pr IV

Continued

Configuration Term J

Level (cm -1

) Leading percentages

4/( 2 F?/2 ) 5/ 2

[ n/ 2 ] 5 204032.1 72 or 84 3 H

6 204815.6 84 or 90 3 H

" 2

t 7

/ 2 ] 3 204557.0 54 or 86 3 F

4 205748.3 69 or 50 3 F

» 2

[

x / 2] 1 206369.4 47 or 91 3p

0 89 or 87 >S

Pr v ( 2 F§/2 ) Limit 31U00
(Cs I sequence; 55 electrons) Z=59

Ground state (ls 2 2s 2 2ps 3s 2 3p6 3d 10 4s 2 4pfi 4d 10 5s 2 5pfi ) 4/ 2 F°/2

Ionization energy 464000± 400 cm 1 57.53± 0.05 eV

Kaufman and Sugar observed 12 lines of Pr v in the region 840-2250 A, with accuracies

such that the uncertainties of the resulting levels are from 1 to 2 cm' 1. The term assignments

are supported by comparisons along the isoelectronic sequence, the authors noting that the

“quantum defect, doublet splitting, and term energy intervals were found to vary in a regular

way through the Cs I sequence.”

The hyperfine splitting of the 6s 2 S 1/2 level was resolved. The component levels are given

as 178969.4 cm -1 (F=2) and 178972.3 cm' 1 (F=3), with the separation of 2.95 cm' 1 being

accurate to about ±0.05 cm' 1

. Kaufman and Sugar derived the ionization potential from the 6s and 7s levels. A slightly

different value obtained from the same data is quoted here [Sugar, 1975], The relatively high

accuracy derives from a regularity in the quantum defects of such levels that holds throughout

the rare-earth group.

References

Kaufman, V., and Sugar, J., J. Res. Nat. Bur. Stand. (U.S.) 71A, 583 (1967). EL CL W Hfs IP

Sugar, J., J. Opt. Soc. Am. 65, 1366 (1975). IP

[July 1976]

Pr V

Configuration Term J

Level (cm -1

)

5p6

(

1 S)4/ 2p° 5

/2 0.0

7 /2 30274

5p6

(

1 S)5d 2 D 3

/2 115052.3

S

/2 118513.8

5p

e

(

l S)6s 2 S ‘/2 178971.1

5p6(

1 S)6p 2 P° X /2 2231t78.1

3

/2 230039.5

5p6

(

1 S)7s 2 S Va 304511.5

Pr Vi PSo) Limit 464000
NEODYMIUM

Nd i

60 electrons Z=60

Ground state (ls 2 2s 2 2pfi 3s 2 3ps 3d 10 4s 2 4p6 4d in 5s 2 5ps

) 4/ 4 6s 2 5 I 4

Ionization energy 44562± 5 cm

-1 5.5250± 0.0006 eV

Identified even configurations 4/ 4 6s 2

, 4/ 4 5d6s, 4/ 3 5d6s6p, 4/ 3 5d2 6p, 4/ 4 5d2

, 4/ 4 6s7s

Identified odd configurations 4/ 4 6s6p, 4/ 3 5d6s 2

, 4/ 3 5d2 6s, 4/ 4 5d6p

Spectrum Observations, Early Analysis

The wavelengths and temperature classifications for 2863 Nd lines (2963-7005 A)

published by A. S. King in 1933 are still useful, especially since a complete list of lines based

on the more recent observations has not been published.

Van de Vliet [1939] began a series of investigations of Nd spectra in the Zeeman

Laboratory, Amsterdam, with his observations of the Zeeman effect. In 1946 Schuurrnans gave

the 4/ 4 6s 2 5 I levels of Nd I, which he had found with the aid of King’s and van de Vliet’s data. Klinkenberg [1946, 1955] and Hassan [1962, 1963] extended the observations. Klinkenberg

located about 100 upper odd levels, but the analysis and interpretation were limited by the

lack of sufficiently accurate wavelengths and Zeeman data [Hassan and Klinkenberg, 1963].

The more recent observations of Nd I and Nd ii have yielded wavelengths for a total of more than 27000 lines in the range from 2450 A to 4.1 p.m. About 25000 lines were

photographed at the Argonne National Laboratory and measured with an automatic

comparator at the Zeeman Laboratory [Hoekstra, 1969]. Wyart’s thesis [1968] gives

wavelengths from these measurements for about 2170 lines (4662-8713 A) for which he

measured the Zeeman effect; the complete line list has not been published. Blaise, Chevillard,

Verges, and Wyart [1970], at the Aime Cotton Laboratory, Orsay, measured 2049 Nd lines in the infrared region from 0.8 to 2.5 p.m, and Morillon’s observations [1970] from 2.3 to 4.1 p

m

gave wavelengths for 470 lines. Since 1965 the work on Nd I and Nd II at Amsterdam and

Orsay has been carried out “in close and stimulating collaboration” [Blaise, Wyart, Hoekstra,

and Kruiver, 1971],

Levels, g Values, and Theoretical Interpretation

The theses of Wyart [1968] and Hoekstra [1969] reported revisions and large extensions of

the analysis of Nd I. About 700 energy levels were known by 1970. Most of the levels and g

values given here are from the paper by Blaise, Chevillard, Verges, and Wyart [1970], with some additions and corrections from Blaise et al. [1971, 1976]. Many of the three-place level values are actually given to the nearest 0.005 cm -1

; the probable error for these levels is presumably somewhat larger than for the other three-place levels. Blaise et al. [1971, 1976] found two low levels and three upper levels comprising a system

not yet connected with the other levels. They tentatively assigned the two low levels to 4/ 4 6s 2 5 F, and 5 F 2

. We have adjusted the levels to a value of 10200.00 cm" 1 for the 5 Fj level,

approximately in agreement with the value they calculated for 4/ 4 6s 2 5 Fj. The lack of a connection for the system is indicated by the notation “ +x” following each of the five levels. Hassan, Abbas, and Turki [1975] list 45 levels for Nd I. Several of their odd levels are confirmed by the more complete analyses used for this compilation.
Nd I —Continued 125

Wyart derived most of the g values from his measurements of Zeeman-effect

spectrograms (2900-11200 A) obtained by M. Fred at the Argonne Laboratory [Wyart, 1968; Hoekstra, 1969; Blaise et al., 1970]. Most of these values are given to the nearest 0.005 units. Childs and Goodman [1972] measured the g values of the 5 1 ground-term levels to within

uncertainties of two or three units in the fifth decimal place.

The available eigenvector percentages are limited to the four lowest configurations (two

odd and two even). The percentages for the 5 I ground-term levels are from Conway and

Wybourne [1963], and the percentages for the 4/ 4 5d6s, 4/ :! 5c?6s 2

, and 4/ 3 5d2 6s levels are from

Blaise et al. [1971], The 4/ :i 5c?

2 6s percentages are based on the “real” 4/ :! (4 I°) grandparent

term (not pure LS-eoupling basis states), and all 4/ 2 5d 2 6s states based on higher 4/ :! terms were neglected. Some details of the basic methods used for the calculations of 4/ 4 5d6s and

4/ :! 5d6s 2 are given in Wyart’s thesis [1968], No configuration interaction has been included.

No calculations are available for two of the identified odd configurations nor for four of

the identified even configurations listed above. Blaise et al. [1971] have outlined some of the

criteria for the assignments of levels to these configurations. Only the configuration and final term assignments are given in the most complete list of levels [Blaise et al., 1970], Following

these assignments, we have grouped some of the levels into terms and also in some cases have

supplied parentages. The designations of several of the resulting terms are followed by

question marks to indicate that all of the grouped levels may not belong to the same term.

Isotope Shifts, Ionization Energy

Isotope-shift data have played an important role in the interpretation of the Nd I spectrum [see, e.g., Rao and Gluck, 1964; Wyart, 1968; Blaise et al., 1971]; only a few of the

pertinent references are listed below.

Worden, Conway, Paisner, and Solarz [1977] have observed high members of a series in Nd i by using laser techniques. These data became available too late for inclusion here, but the

quoted ionization energy was determined by Worden et al. from the new series.

References

Blaise, J., Chevillard, J., Verges, J., and Wyart, J. F., Spectrochim. Acta, Part B 25, 333 (1970). EL CL W ZE

Blaise, J., Wyart, J. F., Hoekstra, R., and Kruiver, P. J. G., J. Opt. Soc. Am. 61, 1335 (1971); unpublished additions and

corrections (1976). EL ND ZE PT

Childs, W. J., and Goodman, L. S., Phys. Rev. A 6, 1772 (1972). ZE Hfs Conway, J. G., and Wybourne, B. G., Phys. Rev. 130, 2325 (1963). PT

Gerstenkorn, S., Helbert, J. M., and Chabbal, R., C. R. Acad. Sci. 261, 1232 (1965). IS Hassan, G. E. M. A., Thesis, Univ. Amsterdam, 175 pp. (1962). EL CL W ZE IS IP Hassan, G. E. M. A., Physica (Utrecht) 29, 1119 (1963). EL ZE IP

Hassan, G. E. M. A., Abbas, A., and Turki, A. H., Indian J. Phys. 49, 729 (1975). EL ZE

Hassan, G. E. M. A., and Klinkenberg, P. F. A., Physica (Utrecht) 29, 1133 (1963). CL ZE IS

Held, S., Israel Atomic Energy Commission, IA-927, 37 pp. (1964). W

Hoekstra, R., Thesis, Univ. Amsterdam, 64 pp. (1969). EL W ZE

King, A. S., Astrophys. J. 78, 9 (1933). W

Klinkenberg, P. F. A., Physica (Utrecht) 12, 33 (1946). EL ZE

Klinkenberg, P. F. A., Thesis, Univ. Amsterdam (1955). EL CL W ZE

Morillon, C., Spectrochim. Acta, Part B 25, 513 (1970). CL W

Noldeke, G., and Steudel, A., Z. Phys. 137, 632 (1954). IS Hfs

Paul, F. W., Phys. Rev. 49, 156 (1936). W

Rao, P. R., and Gluck, G., Proc. R. Soc. London, Ser. A 277, 540 (1964). IS Schuurmans, Ph., Physica (Utrecht) 11, 419 (1946). EL CL

Smith, K. F., and Spalding, I. J., Proc. R. Soc. London, Ser. A 265, 133 (1961). ZE

van de Vliet, H. J., Thesis, Univ. Amsterdam, 85 pp. (1939). ZE

Worden, E. F., Conway, J. G., Paisner, J. A., and Solarz, R. W., unpublished material (1977). IP Wyart, J. F., Thesis (Third Cycle), Univ. Paris, Orsay, 106 pp. (1968). EL ND CL W ZE IS PT

Wyart, J. F., J. Phys. (Paris) Suppl. Colloq. C 1 30, 50 (1969). EL ZE PT

[October 1976]
126

Nd I, Even Parity

Configuration Term J

Level (cm' 1 ) 9 Leading percentages

4/4 6s2 5

I 4 0.000 0.60329 98 l 3 H4

5 1128.056 0.90047 99 l 3 H4

6 2366.597 1.06991 99 7 3681.696 1.17538 98 l 3 K2

8 5048.602 1.24527 96 3

3 K2

4/4( 5 I)5d6s(3 D) 7 L 5 8475.355 0.505 99 1 ( 5 I)(3 D) 5 K

6 9115.092 0.785 94 3 ( 5 I)(3 D) 5 L

7 9939.704 0.965 93 4 ( 5

I)( 3 D) 5 L

8 10897.998 1.085 93 4 ( 5

I)(3 D) 5 L

9 11959.761 1.170 95 3 ( 5 I)(3 D) 5 L

10 13101.411 1.225 97 2 ( 5 I)(3 D) 5 L

11 14304.110 1.265 100

4/4( 5 I)5d6s(3 D) 7 K 4 9814.683 0.405 98 1 ( 5 I)(3 D) 5

I 5 10376.842 0.770 94 3 ( S I)(3 D) 5 K

6 11109.167 0.970 92 5 ( 5 I)(3 D) 5 K

7 11918.353 1.055 65 18 ( 5 I)( 3 D) 5 L

8 12902.422 1.180 87 5 ( 5 I)( 3 D) 5 K

9 13953.585 1.245 90 4 ( 5

I)(3 D) 5 L

10 15073.203 1.290 95 5 ( 5

I)( 3 D) 5 L

4/4 6s2 ?

5 F 1 10200.00 +x 0.0 23

4

10550.50 +z 0.99

4/4

( 5 I)5d6s(3 D) 5 L

5

6 10774.927 0.728 59 33 ( S

I)( 1 D) 5 L

7 12056.824 0.985 42 27 ( 5

I)( 3 D) 7 K

8 13333.505 1.055 59 30 ( 5 I)( 1 D) 5 L

9 14687.945 1.140 63 29 ( 5 I)( 1 D) 5 L

10 16092.06 1.200 67 27 ( 5 I)( 1 D) 5 L

4/4( 5 I)5d6s(3 D) 7

I 3 11001.353 0.270 90 9 ( 5 I)(3 D) 5 H

4 11486.093 0.750 85 7 ( 5 I)(3 D) 5 H

5 12178.643 0.963 80 6 ( 5 I)(3 D) 5 K

6 12917.422 1.105 74 9 ( 5

I)( 3 D) 5 K

7 13798.860 1.203 74 8 ( 5 I)( 3 D) 7 H

8 14780.090 1.270 77 8 ( 5 I)(3 D) 5K

9 15834.515 1.315 87 10 ( 5 I)(3 D) 5 K

4/4( 5 I)5d6s(3 D) 7 G 1 11841.78 -0.485 100 2 11990.02 0.77 90 7 ( 5 I)(3 D) 5 G

3 12264.88 1.080 79 14 ( 5

I)( 3 D) 5G

4 12624.175 1.060 68 21 ( 5 I)(3 D) 5G

5

6

67 19 ( 5 I)( 3 D) 5G

4/4( 5 I)5d6s(3 D) 5 K

/

5 12065.807 0.715 56 26 ( 5

I)( 1 D) 5 K

6 13195.169 0.935 53 26 7 14327.638 1.070 55 23 8 15533.960 1.160 57 21 9 16791.257 1.230 60 21

4/4( 5 I)5d6s(3 D) 5 H 3 12736.919 0.695 46 25 ( 5 I)( 3 D) 3G

4/4

( 5 I)5d6s(3 D) 4 13017.120 0.795 37 5

I 27 ( 5

I)( 3 D) 3 H

4/4( 5 I)5d6s(3 D) 3 13781.840 0.710 38 5G 23 ( 5

I)( 3 D) 5 H

4f4

( 5 I)5d6s(3 D) 5

I 5 14122.461 0.980 47 23 (“DOD) 5

I
127

Nd i, Even Parity—Continued Nd I, Even Parity—Continued

Configuration Term J

Level (cm -1

) 9 Configuration Term J

Level (cm -1

) 9

4/3

( 4 I°)5d ( 5 L°)6s6p(3P°) 7M 6 20271.673 0.595 4/3

( 4 I°)5d2

( 3 F) ( 6 M°)6p 7 N 7 24856.360 0.850

7 21240.345 0.830 8 22680.963 0.975 6 24926.767 0.955

9 24264.991 1.065 7 25005.315 0.905

10

11 7 25026.390 1.020 12 8 25046.797 1.025

4/3 5d6s6p 7 L 5 20486.822 0.545 8 25189.930 1.110

4f

3 5d6s6p 7 K 4 21257.363 0.465 6 25207.070 0.905

4P 5d6s6p 7 L 5 21361.414 0.570 7 25383.854 0.971

4P 5d6s6p 7 L 6 21388.164 0.820 5 25450.400 0.820

4/4 5<22 7 M 6 21889.659 0.580 8 25529.411 0.990

4

3 5d6s6p 7 K 5 21924.137 0.780 7 25534.316 0.905

4/3 5d6s6p 7 L 6 22121.676 0.765 5 25619.648 0.965

4/3 5d6s6p 7 L 7 22615.179 0.845 7 25623.570 1.050

4/4 5d2 7 M 7 22705.580 0.810 6 25674.250 0.915 6 22874.654 0.900 8 25703.655 1.095 4/3 5d6s6p 7

I 3 22909.965 0.395 8 25740.206 1.090 5 23065.496 0.835 6 25746.414 0.860 6 23108.948 0.895 3 25822.628 0.660

5 23175.246 0.785 6 26014.144 1.090 6 23221.966 0.965 6 26027.860 1.080 6 23242.421 1.115 2 26288.475 0.465

7

I 3 23248.393 0.290 6 26303.870 0.990 4/3 5d6s6p 7 L 7 23269.485 0.905 5 26331.356 0.835

4 23275.398 0.580 4/3

( 4 I°)5d2( 3 F) ( 6M°)6p 7 N 8 26333.118 0.890 5 23281.089 0.545 5 26357.250 0.875

7

I 4 23346.750 0.740 8 26425.327 1.135 5 23565.210 0.760 7 26515.707 1.085 4 23808.534 0.610 6 26668.475 1.020 3 23866.080 0.450 4 26694.655 0.805 8 23952.890 1.053 7 26835.359 0.860 4/4 5d2 7 L 6 23964.137 0.815 6 26892.543 0.910 6 23969.072 0.840 7 26898.411 1.040 6 24146.624 0.890 9 26987.075 1.140 5 24198.530 0.800 7 27000.108 1.055 4/3 5d6s6p 5 M 7 24217.847 0.870 6 27056.090 0.990

4 24225.650 0.875 4 27222.174 0.860 8 24231.280 1.065 7 27223.630 1.095 7 24260.091 1.010 9 27265.575 1.040

4P 5d6s6p 7 M 9 24264.991 1.065 8 27324.410 1.040 4/4 5d2 7 M 9 24558.778 1.098 7 27381.805 1.005 2 24559.635 0.245 6 27423.635 1.025 5 24577.981 0.870 7 27502.595 1.087 4/4 5d2 7 L 7 24793.359 0.965 7 27554.118 0.995

7 24821.218 1.060 7 27567.908 1.000
128

Nd I, Even Parity—Continued Nd I, Even Parity—Continued

Configuration Term J

Level (cm -1

) 9 Configuration Term J

Level (cm -1

) 9

4 27588.440 0.790 5 29310.196 0.870

6 27589.409 1.080 6 29314.777 0.995

6 27633.729 0.975 9 29365.082 1.055

6 27679.543 1.130 8 29391.756 1.130

6 27711.985 0.945 5 29493.945 0.830

6 27755.134 1.045 9 29494.836 1.100 9 27777.530 1.085 5 29535.427 0.970

7 27805.365 1.020 8 29537.338 1.075

8 27815.384 1.015 10 29570.770 1.060

4 27852.748 0.845 8 29685.852 1.035

9 27881.244 1.140 8 29802.070 0.995

8 27922.081 1.125 6 29853.580 1.086

5 27926.240 0.880 8 29873.308 1.110

9 27961.248 0.975 7 30011.635 1.055

5 27988.786 1.000 5 30148.057 0.950

5 30200.650 0.880 4/4

( 5 I)6s7s(3 S) 7

I 3 28027.403 0.345

4 28229.220 0.710 8 30319.660 1.165 5 28578.959 0.945 6 30405.300 1.035 6 29522.78 1.085 7 30630.89 1.200 3 30475.205 0.685 8 31838.70 1.255 8 30489.865 1.110 9 33106.00 1.315 9 30644.708 1.044 6 28040.725 0.840 5 31129.734 1.000 5 28086.830 0.860 5 31151.150 0.835

7 28105.805 1.045 4 31182.990 0.520 5 28160.209 0.895 8 31235.494 1.086 5 28220.326 0.895 7 31242.740 0.940 7 28354.540 1.060 7 31381.920 1.055 6 28356.954 0.980 7 31524.204 0.980

7 28412.288 0.995 6 31529.965 1.135 4 28438.783 0.880 4 31541.980 0.860 8 28440.275 0.935 5 31555.724 0.735 5 28525.930 1.075 7 31801.150 0.955 5 28665.120 0.920 3 32226.230 0.840

4 28695.460 1.085 4 32265.520 0.935 5 28731.205 0.870 2 32430.985 0.700 6 28758.742 1.020 4 32617.700 0.620 8 28839.355 1.070 7 33170.042 0.975 6 28858.270 0.855 6 33634.150 0.925

5 28885.798 0.825 6 34302.090 0.950 7 28934.040 0.945 3 34867.271 0.670 6 28950.824 0.735

8 29060.068 0.950

6 29280.696 0.720 Nd II ( 6

l7/2) Limit 44562
129

Nd I, Odd Parity

Configuration Term j

Level (cm' 1 ) 9 Leading percentages

4/3( 4 I°)5d6s2 5 L° 6 676A211 0.715 92 4 ( 2 H°) 3 K° 7 8A02.A87 0.905 95 2 ( 2 H°) 3 K° 8 10160.612 1.035 97 2 ( 4 I°) s K° 9 12162. U2 1.113 98 1 ( 4 I°) 5 K°

10 99 1 ( 2 K°) 3 M°

4/3( 4 I°)5d6s2 5 K° 5 6853.99

0.675 87 8 ( 4 I°) 3 I° 6 8AH.900 0.905 94 2 ( 4 I°) 3 I° 7 10017.790 1.045 94 1 ( 4 I°) a K° 8 1170A-6A0 1.160 94 2 ( 4 I°) 3 LC 9 93 3 ( 4 I°) 3 L°

4/3( 4 I°)5d2 ( 3 F) ( 6 M°)6s 7 M° 6 8800.392 0.580 97 1 ( 4 F)(3 F) (4

L°) 5 L° 7 9692277 0.805 93 4 (4I°)(3F) ( 6M°) 5M° 8 1078A.929 0.960 92 5 ( 4 I°)( 3 F) ( 6M°) 5 M° 9 11887.735 1.085 92 5 ( 4 I°)( 3 F) ( 6 M°) 5 M°

10

1112

4/3 ( 4 I°)5d6s2 5 I° 4 9083.813 0.615 90 6 ( 4 I°) 3 H° 5 1000A-583 0.880 59 28 ( 4 I°) 3 I° 6 11179.0A5 1.035 49 26 ( 4 I°) 3 I° 7 12927232 1.110 70 12 ( 4 I°) 3J° 8 1A732200 1.240 86 10 ( 4 I°) 3 K°

4/3 ( 4 I°)5d6s2 5 H° 3 9927.387 0.570 76 16 ( 4 I°) 3G° 4 10672.571 0.855 59 28 ( 4 I°) 3 H° 5 1239A260 1.038 65 18 ( 4 I°) 3 I° 6 1 A308.080 1.106 53 32 ( 4 I°) 3I ° 7 15396.590 1.165 43 39 ( 4 I°) 3 I°

4/3 ( 4 I°)5d6s2 5 10918.755 0.900 35 *r 30 ( 4 I°) 3 I°

4/3 ( 4 I°)5d2 ( 3 F) ( 6 L°)6s 7 L° 5 11108.813 0.510 95 3 ( 4 I°)(3 F) ( 4 K°) 5K° 6 11812.80A 0.790 88 4 ( 4 I°)( 3F) ( 6 L°) 5 L° 7 12611210 0.880 84 6 ( 4 I°)( 3 F) ( 6 L°) 5L° 89

10

13726.950 1.080 79 6 ( 4 I°)(3 F) ( 4 L°) 5 L°

11

4/3 ( 4 I°)5d2 ( 3 F) ( 6 K°)6s 7 K° 4 11360. 79

0.410 87 5 ( 4

I°)( 3P) ( 6K°) 7 K° 5 12009206 0.775 83 5 ( 4 I°)( 3p) («K°) 7 K° 6 12837.035 0.985 80 5 ( 4 I°)( 3F) ( 6 K°) 5K° 7 13799.780 1.090 74 6 ( 4 I°)(3 F) ( 4 K°) 5 K° 8 1A931230 1.180 69 7 ( 4 I°)(3 F) (6 L°) 7 L° y

10

4/3 (4 I°)5d6s2 5G° 2 94 4 ( 2 H°) 3F° 3 11375.770 0.875 59 23 ( 4 I°) 3G° 4 13116.887 0.990 48 31 ( 4 I°) 3 H° 5 13896.372 1.170 55 14 ( 4 I°) 5 H° 6 15739.680 1.270 67 15 ( 4 I°) 3 H°

4/3 ( 4 I°)5d6s2 4 11992.388 0.960 28 5G° 23 ( 4 I°) 5 H°

4/3 ( 4 I°)5d2 ( 3 F) ( 6 I°)6s 7J° 3 12369.A70 0.300 89 8 ( 4 I°)(3 F) ( 4 H°) 5 H° 4 12878.503 0.775 84 5 ( 4 I°)( 3 F) ( 4H°) 5H° 56789

136Al.835 1.000 79 7 ( 4 I°)(3 F) ( 4 I°) 5 I°
130

Nd I, Odd Parity—Continued

Configuration Term J

Level (cm -1

) 9 Leading percentages

4/3

( 4 I°)5d6s2 6 12505. 75

A

1.020 46 sr 24 (4 I°) 3 R

o

4/3( 4 I°)5d2

( 3 F) ( 6M°)6s 5 M° 7 12731.80

A

0.920 86 5 ( 4 I°)(3 F) ( 6 M°) 7M°

8

Q

1U66.980 0.930 83 6 ( 4 I°)( 3F) ( 6M°) 7 M°

10

11

4/3( 4 F)5d6s2 6 13276.820 0.990 36 3 K° 26 ( 4 I°) s H

°

4/3

( 4 I°)5d2

( 3 F) ( 6 H°)6s 7 H° 2 13621.805 0.030 88 8 ( 4 I°)( 3 F) ( 4G°) 5G°

3 13733497 0.670 78 6 ( 4 I°)(3 F) ( 4G°) 5G°

4 13982.696 0.930 70 9 ( 4 I°)( 3F) ( 4 H°) 5 H°

5 U677.896 1.090 43 16 ( 4 I°)(3 F) ( 6 K°) 5 K°

6 15598.133 1.210 41 13 ( 4 I°)(3 F) ( 4 H°) 5 H°

78

167U6.95U 1.265 24 20 ( 4

I°)(3 F) (61°) 7 I°

4/3

( 4 F)5d6s2 3G° 3 13630.361 0.775 53 35 ( 4 I°) 5G°

4 16209.8AO 1.055 70 19 5 18133495 1.190 64 6

4/4( 5 I)6s6p(3 P°) 7 K° 4 13672.851 0.440 5 1 A311.99A 0.780 6 15220.805 0.985

7 16282.827 1.110 8 1 7AA0A298 1.190 9 18709.86A 1.230 10 1993A-A85 1.290

4/4( 5 I)6s6p(3 P°) 7 I° 3 1AA38.8A5 0.390 4 15235.585 0.745

5 15625.975 0.850 6 16658427 1.050 7 17837470 1.150 8 19093.93

A

1.200 9 20523475 1.230

4/3

( 4 I°)5d6s2 7 1A722.161 1.160 29 3J° 26 ( 4 I°) 5 I°

4/3( 4 I°)5d2( 3 F) ( 6 K°)6s 5 K° 5 1A797.102 0.760 52 15 ( 4 I°)( 3 F) ( 6 H°) 7 H°

4/4 6s6p 5 H° 4 1A801.9A5 0.825 4/3

( 4 F)5d6s2 3 H° 5 15113.956 1.110 48 31 ( 4 I°) 5Q°

4/4 6s6p 7 H° 2 15382.310 0.030

4/4 6s6p 7 H° 3 15ASA-689 0.690

5 K° 5 15522.917 0.855

4/3

( 4 I°)5d2( 3 F) ( 6G°)6s 7 G° 4 15599.985 0.630 55 22 ( 4I°)(3 F) ( 4G°) 5G°

4 15718.726 0.755

6 15780.356 0.945

4/4 6s6p 7 H° 4 15863.061 1.020

4/3( 4 I°)5d2( 3 F) ( 4 H°)6s 3 15898.902 0.600 27 5H° 21 (4 I°)(3F) (6 H°) SH°

5 16028.050 0.915

4 16059.191 0.713

4/3( 4 F)5d2( 3 F) ( 6 K°)6s 6 161288A1 0.950 43 5 K° 13 ( 4 I°)(3 F) ( 6 H°) 7 H°

5 16163.811 0.925

5 16257.778 0.957 4/3

( 4 F)5d 6s2 7 16387.532 1.175 41 3J° 39 ( 4 I°) 5 H

=

5 16757.037 1.035
131

Nd I, Odd Parity—Continued

Configuration Term J

Level (cm -1

) 9 Leading percentages

4/3

( 4 I°)5d2( 3 P) ( 6 K°)6s 7 K° 6 16796.783 0.955 59 8 (4I°)(3F) ( 4 L°) 5 L°

5 16844-843 1.015 7 16845.388 1.120

3 16979.352 0.520

4 17032.146 1.020 4/3

( 4 I°)5d6s2 3 H° 6 17085.070 1.215 46 25 ( 4 I°) sG

°

4f

4 6s6p 5 17162.930 1.135 4/3

( 4 I°)5d2( 3 F) ( 6 H°)6s 6 17237.450 1.190 24 7 H° 17 ( 4 I°)( 3 F) ( 6G°) 7G°

7 17289.640 1.070 4 17319.761 0.865 5 17387.528 0.735 4/3

( 4 I°)5d2( 3P) ( 6 I°)6s 7 r 4 1 7652.848 0.755 73 9 ( 4 I°)( 3 F) ( 4

I°) 5 I° 6 17748.814 1.090

4/3( 4 F°)5d6s2 5 H° 3 1 7786.992 0.600 88 5 ( 2 D°) 3G°

4 18741.337 0.930 90 3 ( 2 D°) 3G°

5 19815.981 1.110 78 3 ( 2 H°) 3 I° 6 20673.022 1.185 70 6 ( 2G°) 3 I° 7

4 17790.018 0.920 5 1 7790.613 1.005 8 17973.309 1.200 3 17976.888 0.900 5 18029.780 0.970 *

5 18067.942 0.920

7 18143.686 1.090 6 18171.819 1.080 4/3

( 4 I°)5d2

( 3 F) ( 4 K°)6s 6 18249275 0.945 13 5 K° 11 ( 4 n(3 P) ( e n 7 i° 5 18249.784 1.010

7 18256.805 0.955

5 18304-400 0.845

4 18436.007 1.075 6 18446.541 1.180 3 18589.901 0.660

5 18627.302 0.945 4/3

( 4 I°)5d2

( 3 F) ( 6 I°)6s 6 18679.139 1.080 17 7r 16 ( 4 I°)( 3P) (6!°) ?I

°

5 18732.556 0.940 6 19152.080 0.930

4 19209262 0.990 9 19218.140 1.270

5 19226.443 0.925 4/3

( 4 I°)5d2

( 3 F) ( 6G°)6s 7 G° 7 19271240 1.260 54 16 ( 4 I°)(3 F) ( 4 H°) 5 H°

6 19281.068 1.055 6 19428.540 1.040

4 19590241 0.785 5 19648.022 1.070
132

Nd I, Odd Parity—Continued

Configuration Term J

Level (cm -1

) 9 Leading percentages

5 19700.856 0.560

7 19746204 1.090

4 19769.507 0.920 8 19862.845 1.290

4 19956.8lit 0.910 6 19994-716 0.920 4 20046.654 0.900 4/3

( 2 H°)5d6s2 6 201 18.99

A

1.015 23 3K° 16 ( 2 H°) 3I° 5 201 76.912 0.960 3 20281.957 0.895

4/4 6s6p 5 K° 5 20300.875 0.775 6 21543.326 0.900

7 22761. 440 1.035 8 24121.478 1.135 9 25518.700 1.220

4/4 6s6p 5 I° 4 20360.673 0.735

6 20432.386 1.040

4 20478.962 0.895

5 20541.833 0.990

7 20583.890 1.070 4/3

( 2 H°)5d6s2 3 20594-915 0.910 32 3G° 10 ( 4 F°) 5 G°

6 20703.113 1.035

5 20827.652 0.985

6 20839206 0.940

4 20859.563 1.080

6 20918.059 0.840

5 20963.071 0.990

4f

4 6s6p 5 I° 5 21005.439 0.960

4 21009.134 1.280

7 21025.517 1.235

4 21184-881 0.920

3 21227.550 1.032

7 21239.427 1.250

5 21271.524 1.040

7 21285.976 1.050

6 21314254 1.060

4 21314-439 0.985

6 21345.572 0.975

4 21345.837 0.880

7 21411-523 1.067

5 21469.140 1.220

4 21488.390 0.910 5 21558.796 0.835
133

Nd I, Odd Parity—Continued Nd I, Odd Parity—Continued

Configuration Term J

Level (cm -1

) 9 Configuration Term J

Level (cm -1

) 9

4/4 6s6p s H

° 3 21572.610 0.650 6 23040.538 1.075

7 216UO.050 0.980 5 23049.760 1.060

6 21 718.328 0.960 4 23088.680 1.250

5 21726.771 1.000 5 23198.130 1.085

4 21 758727

0.735 4 23203.810 1.200

6 21797.900 0.990 3 2321 7.930 1.060

7 21908.639 0.970 5 23241-915 0.775

4 21926.903 0.860 6 23283.635 1.040

3 21951.870 1.070 6 233247278 1.070

4 22010.3AO 0.815 6 23350.793 0.875

7 22041.570 1.020 5 23433.840 0.965 6 22049.736 1.040 4 23438.440 0.885 4 22076.640 1.035 8 23474-023 1.123 6 22123.898 1.170 3 23487.080 0.683

5 22128.600 1.060 6 23496.003 0.930

5 22192£9 7 1.090 7 23517.752 1.052

1 22215.05+x 1.395 4/4

( 5 I)5d ( 6 L)6p 7 M° 6 23553.851 0.730 3 22222240 1.245 7 24529.411 0.820

3 22229.000 0.705 8

9 25596.944267407268

0.975

1.080 5 22241.911 0.770 10 27970.520 1.170

5 22255.855 1.030

1112 29165.380

30484-586

1.205 1.250 6 22303.048 1.080

7 22320290 1.128 4 23562.766 0.940

5 22367268 1.085 5 23573.049 1.080

5 22406.550 0.885 6 23578.372 0.985

4 22471210 0.995 8 23652.731 1.128

7 22482.764 1.120

7 23744-797 1.040

3 22490.970 0.830 6 23755.750 1.075

5 22530.372 0.850 3 23761.870 1.190

6 22560.071 1.135 5 23801.447 1.065

5 22605.665 1.000 5 23829.550 1.165

4 22622.000 1.280 4 23845.890 1.175

4 22622.790 1.135

7 23876.922 1.075

3 22631.490 1.130 6 23889268 1.030

4 22677.810 0.885

4 23953.397 0.830

5 22736.693 1.070 5 23968.310 0.980

6 22738.850 0.985

6 23985.826 1.100

4 22814-600 0.975

7 23991.098 1.225

5 22814888 0.755 6 23996.513 1.045

6 22870.686 1.164 4 24001.071 1.110

3 22929.940 0.765 4 24070241 0.825

7 22938.734 1.065 8 24077.780 1.070

3 22956.500 0.990 8 24168.695 1.100

4 23016.512 0.810

4 24175.88 0.965
134

Nd I, Odd Parity—Continued Nd I, Odd Parity—Continued

Configuration Term J

Level (cm' 1

) 9 Configuration Term J

Level (cm 1 ) 9

7 21)212.928 1.060 8 25382.895 1.140 4 21)21)7.1)60 0.680 6 25422319 0.910 7 21)270.715 0.990 4 25448.064 1.175 5 24291.930 1.060 5 25470.463 0.580

5 24364M0 1.090 4 25476.540 0.915 5 24428.576 1.190 6 25478.135 1.085

4 24479.510 0.835 3 25499.930 0.825 5 24582.166 0.860 7 25503.978 1.115

5 24586233 1.110 8 25513.721 1.140 6 24589.973 1.010 3 25545.110 0.725

4 24606.125 0.840 5 25555333 0.985

4 24674.567 1.060 7 25596.531 1.095

8 24688275 1.155 2 25604.770 0.505

6 24702.585 1.135 6 25609.372 0.895

7 24729.558 1.150 4 25621.125 1.175

5 24745.790 1.185 4 25640.896 1.120

6 24751.047 0.925 3 25643.460 0.900

8 24773.380 1.145 6 25662.081 1.190

3 24775.168 1.352 6 25750.895 1.200

5 24868.81

7

0.960 3 25787.780 0.900

6 24922.410 1.080 4 25791.080 0.920

7 25849.358 1.085 4/4

( 5 I)5d ( 6 L)6p? a

7 L°? 5 24934-498 0.625

6 25918240 0.825 4/4 5d6p? b7 L°? 5 25864-308 0.750 7 26611.603 0.960 6 26842.129 0.815 8 27328.386 0.945 7 27785.804 0.980 9 28344-032 1.075 8 28821.577 1.100 10 29581.923 1.190 9 29886.558 1.160

11 30874252 1.230 10 30993.181 1.225

11 32107.527 1.270 9 24935.096 1.150

7 24968.490 1.145 7 25885.747 0.965

6 24984-183 1.210 5 25924-462 1.050

7 25063.720 1.100 5 26029.075 1.035

5 25074.779 1.020 3 26060.685 1.360

6 25114-815 1.225 4/4 5d6p? 5 K°? 5 26072.305 0.855 9 25141.541 1.120 6 27391.160 0.905

7 28527.728 1.065 3 25164-400 1.050 8 29754-930 1.135 8 25190.770 1.195 9 31263301 1.205

6 25196.454 1.120 3 26096.006 0.980

7 25197.765 1.120 7 26154-957 0.950

5 25227.122 0.995 3 26162.810 1.180 8 25280.940 1.115 4 26232350 1.025 3 25282.385 1.360 7 26326.958 1.250 6 25301.10 1.21 5 26345336 1.100 7 25349.575 1.210 3 26345.503 1.025 6 25354-565 0.940 7 26394-658 1.080
135

Nd I, Odd Parity—Continued Nd I, Odd Parity—Continued

Configuration Term J

Level (cm -1

) 9 Configuration Term J

Level (cm -1

) 9

3 26395.035 1.060 4 27489.817 1.085

4 26449260 0.870 7 27504.046 1.125

3 26462.900 0.865 5 27523.700 0.970

5 26484-161 1.035 3 27582269 0.945

5 26502.625 1.180 7 27620.780 1.120

9 26510.903 1.165 3 27620.944 0.810 6 26511.022 1.040 3 27694-579 1.060 5 26595.445 1.015 7 27714.489 1.110 4 26603.506 0.935 4 27716.710 0.890

7 26634-857 1.125 4 27780.41

1.030 4 26662.411 1.000 6 27831.090 1.035 4 26683.773 1.130 10 27835.822 1.200 6 26695.703 1.040 5 27841.055 0.990 8 26763.662 1.210 9 27842.460 1.160

4 26770.528 1.200 4 27860.481 1.125

8 26782.921 1.118 4/4 5d6p? b

7 K°? 4 27880.750 0.505 6 26816.488 1.215 5 28514218 0.858 6 29387.657 1.005 4/4

( 5 I)5d ( 6 L)6p? 5M°? 78 26878.120

27961.346

0.805

0.995

78

30266.607

31219.015

1.085

1.120 9 29309.910 1.025 9 32314250 1.170 10 30476.670 1.170 10 33374.315 1.220

11 31637.048 1.205 5 27902.568 1.040 6 26907.981 1.125 6 27913.665 0.910

4/4 5d6p? a

7 K°? 4 26962.959 0.545

7 27953.705 1.107 5 27691.315 0.890 4 27989.990 0.930

6 28680.378 1.025 27998.195

7 29606.670 1.073 3 0.915 8 30604.756 1.160 5 28000.141 0.915

9 31686.040 1.173 28058.160

10 32872.574 1.265 4 0.795

4 28062.501 0.590 4/4 5d6p? 5 L°? 6 28178.960

7 27023.300 0.995 5 0.965 8 28160.690 1.032 4 28210.680 1.010 9 29383.155 1.115 28241.151

10 30608.650 1.183 4 1.020

5 28280.559 1.070 8 27044-344 1.015 6 28309.200 1.000 7

8

27085.423 27130.9271.175

1.17 3 28311270

28393.805

0.800

4 0.980 4 27144-080 0.965 8 28426.752 0.945 4 27230298 1.125 8 28514-659 1.150 3 27258.336 0.720 5 28531.428 1.115 4 27328.788 0.570 5 28567235 1.090 3 27329.680 0.995

8 28589.855 1.175 7 27374.385 1.235 6 28602.740 1.100 2 27435.677 0.910 5 28661.687 0.960 6 27454-721 1.035 4 28719.510 1.070 5 27474.552 1.080
136

Nd I, Odd Parity—Continued Nd I, Odd Parity—Continued

Configuration Term J

Level (cm’ 1 ) 9 Configuration Term JLevel (cm -1

) 9

5 28722.845 0.895 3 29998232 1.089 3 28759.995 0.935 5 30014270 1.037 9 28781.120 1.215 5 30060.045 0.985 8 28787.H0 1.175 5 30090.733 0.962

3 28825468 1.090 5 30099285 1.050 5 28843.988 1.100 5 30139.860 1.070 5 28862.723 0.945 5 30169.707 1.025 6 28946.028 1.208 4 30202.415 1.020

7 28947443 1.090 2 30238.3 0.770 7 29008.809 1.120 4f

4 5d6p? 10 30295.030 1.243 9 29060.965 1.015 3 30399.600 0.890 6 29177.585 0.960 4 30494264 1.030 4 29319.949 0.910 8 30726.324 1.145 10 29340.570 1.217 8 30805.309 1.188 5 29425.514 0.965 2 30875.395 0.795 5 29473.1 75 1.120 6 31000.583 1.007 6 2949 74160 1.268 4f

4 5d6p? 10 31260.190 1.245

6 29510.442 2 31331.36+x 0.875

6 29564.876 1.047 4

f

4 5d6p? 8 31412.145 1.065

9 29764.815 1.185 4/4 5d6p? 11 31666.660 1.107

5 29766.715 0.893 9 31 756.355 1.200

7 29766.974 1.090 9 31904270 1.240

10 29826.357 1.020

9 29956.145 1.138 8 29980.378 1.100 Nd ii ( 6 It/2) Limit 44562
137

Nd II

(Pr i sequence; 59 electrons) Z=60

Ground state (ls 2 2s 2 2p6 3s2 3p6 3d 10 4s2 4p6 4d 10 5s 2 5pfi ) 4/ 4 6s (i I 7/2

Ionization energy 86500± 600 cm" 1 10.73± 0.08 eV

Identified even configurations 4/ 4 6s, 4/ 4 5d, 4/ :1 5d6p

Identified odd configurations 4/ :! 5d2

, 4/ :i 5d6s, 4/ 4 6p

The original analysis of this spectrum by Albertson, Harrison, and McNally [1942] gave

the 4/ 4

( ’I)6s levels, 20 of the low 4/ 4

(

5 I)5c? levels belonging to the 5 sextet terms, and 57

upper odd levels. The analysis was based on wavelengths measured for the MIT Wavelength

Tables [1939], supplemented by King’s temperature classifications of Nd lines, and on Zeemaneffect data obtained at fields up to 8.7 T. In his work at Amsterdam, Schuurmans [1946]

independently duplicated part of the earlier analysis. His published data included the 4/ 4

(

rT)6s

levels and the levels of the two lowest 4/ 4

( 5 I)5d terms. The more recent progress on Nd n at Amsterdam and at Orsay has paralleled the Nd I work [see Nd i ]. Since the wavelength and Zeeman-effect observations include both spectra,

the summary of these need not be repeated. The remarks concerning the three-place level values and g values for Nd I also apply to Nd n. The main references for the levels of Nd II are the theses of Wyart [1968] and Hoekstra

[1969], the 1970 paper by Blaise, Chevillard, Verges, and Wyart, and the report by Blaise,

Wyart, Hoekstra, and Kruiver [1971], About 500 odd levels and somewhat less than 200 even

levels are now known. The positions and g values given here are mainly from the tables of

Blaise et al. [1970], with a few additional levels [Hoekstra, 1969; Wyart, private

correspondence, 1972] and some corrections kindly supplied by Blaise and Wyart.

In his 1973 thesis, Wyart extended his original calculations [1970] of Nd ii 4/ 4 6s and 4/ 4 5d

to include effective interactions and configuration interaction. The eigenvector percentages for

78 levels of these configurations are taken from the thesis. The 10 4/ 4

( 5 I)6s levels fall distinctly into 5 J x j

-coupling pairs [Schuurmans, 1946; Wybourne, 1965], and the experimental g values agree well with the theoretical values for Jx j

coupling. The structure and g values for the levels of 4/ 4 6s based on higher core terms do not

lead to unambiguous J x j designations, however, and no calculation in this scheme is available.

We have thus listed J x j designations only for the 10 4/ 4 ( 5 I)6s levels, as alternates to the usual

6 1,

4 1 designations of LS coupling. The J x j names appear in the last column, following the

purities in the LS scheme.

About 100 high even levels have been found, beginning with a

6 K9/2 level at 34608 cm" 1

, but most of these have not been interpreted.

Some preliminary calculations for the odd configurations 4/ :, (5d+6s) 2 and 4/ 4

( 5 I)6p have

been carried out [Blaise et al., 1971], but the details have not been published. In their

discussion of the odd levels, Blaise et al. state that “the theoretical interpretation ... has not

yielded satisfactory results. Some of the difficulty must almost undoubtedly be attributed to the use of a truncated basis set f 'ds+f 'Cl)d2

, the basis of f

:i ds being complete.” They were

able, however, to assign a number of the odd levels to low terms of the three identified odd

configurations. Since overlapping terms of the same type occur, most of the particular

groupings are given as questionable.

No levels have yet been assigned to the 4/ :, 6s 2 configuration, which Blaise et al. [1971]

suggest may begin around 14000 cm" 1. The ionization energy is from Sugar and Reader.

225-298 0 - 78 - 10
138 Nd II-—Continued

References

Albertson, W. E., Harrison, G. R., and McNally, J. R., Jr., Phys. Rev. 61, 167 (1942). EL CL W ZE

Blaise, J., Chevillard, J., Verges, J., and Wyart, J. F., Spectrochim. Acta, Part B 25, 333 (1970). EL CL W ZE

Blaise, J., Wyart, J. F., Hoekstra, R., and Kruiver, P. J. G., J. Opt. Soc. Am. 61, 1335 (1971). EL ZE PT

Harrison, G. R., Massachusetts Institute Tech. Wavelength Tables, 429 pp. (John Wiley & Sons, New York, 1939; MIT

Press, Cambridge, 1969). W

Hassan, G. E. M. A., Thesis, Univ. Amsterdam, 175 pp. (1962). EL CL W ZE IS

Held, S., Israel Atomic Energy Commission, IA-927, 37 pp. (1964). W

Hoekstra, R., Thesis, Univ. Amsterdam, 64 pp. (1969). EL W ZE PT

King, A. S., Astrophys. J. 78, 9 (1933). W

Klinkenberg, P. F. A., Physica (Utrecht) 12, 33 (1946). ZE

Klinkenberg, P. F. A., Thesis, Univ. Amsterdam (1955). EL CL W ZE

Morillon, C., Spectrochim. Acta, Part B 25, 513 (1970). CL W

Schuurmans, Ph., Physica (Utrecht) 11, 419 (1946). EL CL ZE

Sugar, J., and Reader, J., J. Opt. Soc. Am. 55, 1286 (1965). IP van de Vliet, H. J., Thesis, Univ. Amsterdam, 85 pp. (1939). ZE

Wyart, J. F., Thesis (Third Cycle), Univ. Paris, Orsay, 106 pp. (1968). EL CL W ZE PT

Wyart, J. F., J. Phys. (Paris) 31, 559 (1970). EL ZE PT

Wyart, J. F., Thesis, Univ. Paris-Sud, Orsay, 194 pp. (1973). EL ND ZE PT [Parameter values for the Nd n calculation have been published by Wyart, J. F., Blaise, J., and Camus, P., Phys. Scr. 9, 325 (1974). PT]

Wybourne, B. G., Spectroscopic Properties of Rare Earths, pp. 50-53 (John Wiley & Sons Inc., New York, 1965). PT

[July 1976]

Nd II, Even Parity

Configuration Term J

Level (cm -1

) 9 Leading percentages

4/4

( 5 I)6s 6

I

7/2 0.000 0.445 98 or ( 5

I 4 ) (4J/2 ) 9

/2 513.322 0.805 70 or ( 5

I 4 ) (4,

1 / 2 ) ll/2 1470.097 1.025 80 or ( 5

I 5) (5,V2 ) 13/2 2585.453 1.150 87 or ( 5 Ie) ( 6,V2 ) 15

/2 3801.917 1.235 93 or ( 5 It) (7J/2)

17

/2 5085.619 1.295 97 or ( 5 Is) (8J/2)

4/4

( 5 I)6s 4

I 9

/2 1650.199 0.755 70 or ( 5 Is) (5J/2) n/2 3066.750 0.980 80 or ( 5 Ie) ( 6,V2 ) 13/2 4512.481 1.110 87 or ( 5 It) (7J/2)

15

/ 2 5985.571 1.205 92 or ( 5 Is) (8J/2)

4/4

( 5 I)5d 6 L 41/ 2 4437.558 0.620 96 l ( 3 H4) 4 K

13

/ 2 5487.657 0.850 97 l ( 3 H4) 4 K

15

/ 2 6637.411 1.000 98 1 ( 5 I) 6 K

17

/ 2 7868.896 1.110 98 l ( 3 K2) 4 M

19

/ 2 9166.209 1.180 98 1 ( 3K2) 4 M

21/2 10516.759 1.240 97 2 ( 3 K2) 4M

4/4

( 5 I)5d 6 K 9

/

2

6005.271 0.550 95 2 ( 5 I) 4

I “/2 6931.800 0.840 96 1 ( 5 I) 4

I 13/ 2 7950.070 1.015 96 1 ( 5 I) 6

I 15

/ 2 9042.743 1.130 96 1 ( 5I) 4 L

17/2 10194.786 1.200 95 2 (5I) 4 L

19/2 11392.171 1.250 93 3 (5

I) 4 L

4/4

( 5 I)5d 6

I

7 /2 7524.740 0.480 82 13 ( 5 I) 4 H

9

/

2

8420.321 0.840 90 6 ( 5 I) 4 H

11 h 9357.906 1.035 93 1 ( 5G) 6

I 13/ 2 10337.097 1.140 92 2 ( 5 I) 4 K

15/2 11373.472 1.230 90 4 ( S I) 4 K

17

/ 2 12459.978 1.280 88 5 ( 5 I) 4 K

4/4

( 5 I)5d 6G 3

/2 8716.462 0.010 91 5 ( 5F) 6G

5

/2 8796.378 0.760 58 30 ( 5 I) 4 G

7

/2 9198.395 0.925 40 26 ( 5 I) 4 H

9

/2 10883.260 1.140 43 23 ( 5 I) 4 H

li/2 12021.350 1.157 40 19 ( 5 I) C H

13/2 12334.216 1.325 52 22 ( 5 I) 4 H
139

Nd II, Even Parity—Continued

Configuration Term J

Level (cm -1

) 9 Leading percentages

4/4

( 5 I)5d 6 H 5/2 9674.844 0.455 57 21 ( 5 I) 6G

7

/ 2 10666.777 0.845 61 12 ( 5 I) 4 G

9

/ 2 11709.600 1.050 66 13 ( 5 I) 4 H

11 h 12887.081 1.165 50 25 ( 5

I) 4 H

13

/ 2 13298.888 1.285 46 30 ( 5I) 6G

15

/ 2 14481.957 1.333 91 3 ( 5I) 4I

4/4

( 5 I)5d 9

/2 9877.173 1.095 34 6G 33 ( 5 I) 4 H

4/4

( 5 I)5d 7

/ 2 9908.650 0.850 36 4 H 29 ( 5 I) 6G

4/4

( 5 F)6s 6 F ‘/2 10256.056 -0.650 96 3 ( 3D1) 4 D

3/2 10439.238 1.050 92 4 (5F) 4 F

5

/ 2 10786.783 1.300 88 6 ( 5F) 4 F

7

/ 2 11377.571 1.390 91 5 ( 5F) 4 F

9

/ 2 12087.170 1.430 91 3 ( 5F) 4 F

ll

/2 13048.625 1.450 94 3 ( 3G2) 4G

4/4

( 5 I)5d 4 G 5/2 10887.246 0.520 43 35 ( 5 I) 6 H

7

/2 12222.185 0.957 57 15 ( 5 I) 6 H

9

/

13703.425 1.101 57 10 ( 5I) 4 H

”/

15148.000 1.230 67 8 ( 5 I) 4 H

4/4

( 5 I)5d 11/2 10942.012 1.230 39 6G 31 ( 5 I) 4 H

4/4( 5 F)6s 4 F 3/2 11440.733 0.430 92 3 ( 5 F) 6 F

5

/2 12091.170 1.055 88 6

7/2 12879.050 1.230 88 4

9

/ 2 13971.624 1.325 91 3

4/4( 5 I)5d 4 L 13

/ 2 11580.863 0.805 84 5 ( 3 K2) 4 L

15/2 12906.575 0.970 84 5 ( 3 K2) 4 L

17

/ 2 14301.794 1.074 82 5 ( 3 K2) 4 L

19/2 15749.198 1.160 80 5 ( 5 I) e K

4/4( 5 S)6s 6 S

5

/

11748.832 1.980 94 4 ( Sp2) 4p

4/4( 5 I)5d 4 K 11

/ 2 12276.210 0.870 67 14 ( 51 ) e H

18/2 13597.857 1.010 68 11 ( 5 I) 6 H

15/2 14957.611 1.090 52 20 ( 3 K2)6s 4 K

17

/ 2 16610.554 1.170 57 16 ( 3 K2)6s 4 K

4/4

( 5 S)6s 4 S

3

/

12747.610 1.980 95 3 ( 3P2) 2 P

4/4

( 5 I)5d 4

I 9

/

13246.181 0.815 66 12 ( 5 I) 4 G

“/2 14624.778 1.008 66 8 ( 5 I) 4 G

13

/ 2 15923.260 1.115 69 12 ( 5 I) 4 H

15/2 17001.500 1.195 76 2 ( 5 I) 4 K

4/4

( 3 K2)6s 4 K li/ 2 14049.810 0.767 76 21 ( 3 K1) 4 K

13

/ 2 14387.400 0.953 51 16 ( 3 K2) 2K

15/2 15357.954 1.073 40 25 ( 5 I)5d 4 K

17

/ 2 16295.726 1.171 46 20 ( 5 I)5d 4 K

4/4

( 5 I)5d 13/ 2 14259.383 1.223 43 4 H 24 ( 5 I) 6 H

1

4/4

( 3 K2)6s 2 K 18/2 15417.300 0.920 53 15 ( 3K1) 2 K

15/2 16868.735 1.043 52 12

6K 9

/

34608.625 0.680

4/3

( 4 I°)5d ( 5 L°)6p 6 M 13/2 34782.470 0.785

1S

/ 2 36704.880 0.907

17

/ 2 38741.194 1.042

19

/ 2 40832.415 1.118

21

/ 2 43005.780* 1.177

23

/ 2
140

Nd II, Even Parity—Continued Nd II, Even Parity—Continued

Configuration Term J

Level

( cm -1) 9 Configuration Term J

Level

( cm -1) 9

13/2 34851.551 0.982 5

/ 2 39901.515 0.450 n/2 34889.574 0.905 17

/ 2 40234.325 1.130

11 h 34915.157 0.960 i 5/2 40247.310 1.086

9

/2 35827.550 0.705 3/2 40447.803 0.195

4/3 5d6p e L ”/a 36352.460 0.735

9

/

2

40525.585 0.910

13/2 37531.565 0.845 15/2 40616.180 0.960

15/ 2 17/2 38486.455

40136.516

1.010

1.097

5

/2 40647.585 0.605

19/2 9

/

2

40783.030 0.907

21/2 7

/

2

40837.590 0.765 n/2 36434.621 1.085 17 /2 40857.160 1.114

13/2 36722.170 0.920 9

/

2

40982.115 0.905

6

I

7

/

2

37305.750 0.500 1S

/2 41176.480 1.125

7 /2 37431.863 0.645 5

/2 41257.665 0.715 H/2 37449.465 0.935 5/2 41277.210 0.755

9

/ 2 37664.875 0.825 17

/ 2 41352.438 1.120

13 /2 37724.558 1.070 3

/

2

41532.990 0.035

11/2 37741.662 0.900 17 /2 41751.770 1.170

9

/2 37799.820 0.820

19

/ 2 41912.860 1.162 n/ 2 37836.990 0.823 9

/

2

41944.192 0.930

l 3

/

2

37890.200 0.945 15/2 42079.900 1.117

9/2 37935.155 0.825 15/2 42205.475 1.075

6 H S/2 37979.815 0.560 7

/

2

42271.825 0.820

9

/2 37985.185 0.840 5

/2 42424.880 1.050

13 /2 38033.720 0.990 5

/2 42475.500 1.020

9

/

2

38060.876 1.020

9

/

2

42695.670 1.020

9

/

2

38111.085 0.985 9

/

2

42750.345 0.995

9

/2 38134.666 0.875 19/2 42816.300 1.191 n/ 2 38275.035 0.933 17

/ 2 42931.930 1.015

7

/

2

38431.770 0.590 19

/

2

42945.320 1.195

l ?

/ 2 38629.635 1.170

9

/

2

43014.770 0.905

6 K 9

/

2

38644.140 0.615 9

/

2

43062.054 0.890

9

/

2

38698.658 0.810 9

/2 43176.118 0.830 n/ 2 38736.080 0.915

7 /2 43212.630 0.762

is

/ 2 38803.795 0.965

9

/ 2 43291.858 1.130 u/ 2 38852.450 1.150 7

/ 2 43326.700 0.750

9

/ 2 38883.812 0.870

9

/ 2 43354.940 0.888

15

/ 2 38920.650 1.030

9

/ 2 43422.595 0.900

15

/ 2 38995.110 1.070 19/2 43499.935 1.235

15 /2 39136.695 1.083 9

/ 2 43883.572 1.005

7

/ 2 39442.825 0.805

17

/2 43938.545 1.185

7 /2 39542.970 0.910

17

/ 2 44103.625 1.200

15/2 39602.625 1.050 11/2 44104.990 0.945 n/ 2 39657.295 0.985 11/2 44205.836 1.005

15/2 39685.135 1.050 n/2 44596.330 1.195
141

Nd II, Even Parity—Continued Nd II, Even Parity—Continued

Configuration Term J

Level (cm -1

) 9 Configuration Term J

Level (cm -1

) 9

ii/2 44803.040 1.085 i3/2 45802.216 1.055

6 H 5/2 45039.200 0.355 is/ 2 47020.370 1.154

7 /2 45097.375 0.766

9

/ 2 45149.510 1.065

9

/ 2 45338.830 0.950 Nd III ( s l4) Limit 86500

Nd II, Odd Parity Nd II, Odd Parity

Configuration Term J Configuration (cm ’) 9 Term j

(cm *) 9

4/3

( 4 I°)5d2

( 3 F) 6 M° 15/2 9228.755 0.690 4 K° n/2 13550290 0.802

15/2 10667.120 0.880 9

17 / 2 0.820 h 12199. 1+50 1.010 13562.387

19/2 13819.760 1.103 11/2 13710220 0.860

21/2 1551821+5 1.168

6 H

° 5 23 / 2 0.360

/ 2 13801+230

6

J

0 9/2 13886.989 0.775 4/3

( 4 I°)5d2( 3 F)? 6 K°? 9

/ 2 10091.380 0.560

4 H° 7 n / 2

/ 2 1 1 93931+5 0.795 11+077.532 0.710

IS /2 13337.31+0 1.000 9

/ 2 11+282.608 0.820

15/2 11+835.625 1.137

7

/

1?

/2 16395.062 1.220

6 H

° 11+328280 0.810

19/2 18029270 1.270 n/ 2 11+365.015 0.800

4/3

( 4 I°)5d2( 3 F)? 6 L°? n/ 2 11273.130 0.642

6 H

° S

/2 11+ 1+87.855 0.320

13/2 12013230 0.845 9

/

11+81+3. 51+ 1+ 0.863

ia

/ 2 131+ 79.555 1.007

17 /2 15130.550 1.116

9

/

15013221 0.950

! 9/2 21

/ 2 16906.758 1.190 n/ 2 15139.616 1.000

5/2 15207207 0.575 4/3

( 4 I°)5d ( 5 K°)6s? 6K°? 9/2 11310295 0.585 4 K° ! 3/2 15309.080 0.970

ll

/ 2 121+91291+ 0.840

6 H° ? /2 0.820 13/2 13615.183 1.010 1531+5.880

15/2 11+891+.196 1.110 3

/2 151+20.180 0.010

l 7 /2 16325.588 1.190

9/2 0.975 19/2 17888.700 1.230 151+92.750

5/2 15616.720 0.770

6 I°? ? /2 12232.706 0.520

7

/

9

/2 13063.670 0.805 15777.398 1.010 “/

11+097.683 1.015 15 /2 16113. 11+8 1.130

13/2 15299.680 1.095 17

lS /2 1.118

/ 2 16700.008 1.210

6 L° 16123. 831+ 17 /2 181 71.385 1.260 7

/

1611+ 1+.623 0.855

6 L°? 11

/ 2 12306.715 0.715

6 H° 9

/

16192.780 1.090

13/ 2 1321+ 7. 1+10 0.845 n/2 16237.065 0.925

15/2 11+ 673.1 77 1.012

6 K°? 9

/

l7 /2 1 731+ 9.790 1.102 4/3

( 4 I°)5d2( 3 P)? 16371+.100 0.622

l*/2

21

/ 2

n/2 161+90.950 1.105

9

/

16565.518 0.885

6 r 7

/ 2 12861 . 1+07 0.470 6 r 13

/ 2 16570. 71+7 1.150

4P 5

2 ?4 L°? 13/2 1351+5.970 0.885

9

/ 2 16815.170 0.960

15/2

1

-7/2 1531+8.990 0.990 n/2 1681 721+2 0.868

19/2 191+ 67.625 1.176 n/2 17186.885 0.925
142

Nd II, Odd Parity—Continued Nd 11, Odd Parity—Continued

Configuration Term J

Level (cm -1

) 9 Configuration Term J

Level (cm' 1 ) 9

7

/ 2 17201.292 0.825 7

/

2

22850.552 0.755

9/2 17356.849 1.045 u/2 23127.457 1.105

13/2 17465.321 1.045 ii

/ 2 23159.979 1.065

4 K° l7

/ 2 17544-545 1.205 9/2 23171.114 1.080

6 K° 14 /2 17606.010 0.855 7 /2 23197.787 1.015

6 L

° 19/2 17701.145 1.191 4/4

( 5 I)6p 6 K° 9

/

2

23229.991 0.780

11

/ 2 17848.005 1.230 H/ 2 24445.389 0.915

6 H° 13 /2 18007.940 1.205

13

/ 2 15/2 25524-485

26912.765

1.030

1.130

7 /2 18120.909 1.075 17

/ 2 28418.965 1.200

5

/2 18354-613 0.340

19

/ 2 30002.302 1.260

li

/ 2 183622237 1.175

6 K° 19

/ 2 23292.475 1.240

15/2 18527.325 1.320 14

/2 23378.327 1.035

13

/ 2 18757.106 1.030 7

/

2

23397.385 0.845

6K° 9

/

2

188312119 1.090 9

/

2

23409.537 1.010

7

/

2

19026.065 0.985 u/2 23458.954 1.030

13 /2 19113.633 1.085

9

/

2

23537.387 0.945

6 H° 15/2 192322234 1.230 7

/

2

23636.759 1.130

9

/ 2 19698.640 1.145 5

/2 23706.705 0.785

11/2 19703.017 0.965 15/2 23737.463 1.060

9

/ 2 19758.554 1.055 9

/

2

23771.040 1.010

9

/

2

20058.494 1.152 13/2 23802.190 1.075

6K° 15/2 20297.802 1.152 11/2 23857278 1.010

14

/ 2 20617.814 1.175 18/2 23991.408 1.070

13

/ 2 20646.951 1.153 9

/

2

24003.714 1.050

4 r 9

/

2

20672.581 0.780

9

/ 2 24053.354 0.965

4 H° 7

/

2

20830.048 0.690

7 /2 24130.300 1.194

4 K° H/2 20907.332 0.890 U/2 24134.095 1.020

9

/

2

21050.626 1.070 18/2 24243228 1.165

6 H° 5

/2 21241.085 0.310 7

/

2

24316.040 1.140

7 /2 21291.761 0.825 9

/

2

24321262 0.900

7

/

2

214112258 0.895 13

/ 2 24418.720 1.130

“/2 21506.550 1.080 7 /2 24468.033 0.945

6 K° l7

/ 2 21729.555 1.195 4 K° 1S

/ 2 24547.470 1.120

18/2 21870.565 1.095 9

/ 2 24569.784 1.185

7

/

2

21871.522 0.630

ii /2 24685.721 1.122

4 H° 9

/2 21918.068 0.940 4 I

° 13/2 24721.059 1.050

9

/

2

22187.658 0.980 9

/2 24797.387 0.975

ll

/ 2 22212.745 1.195 14

/ 2 24842.878 0.975

9

/2 22358.081 1.080

7

/

2

24913.863 0.860

7 /2 22389.854 0.755

13

/ 2 24955215 1.130

9

/

2

22455.624 1.000 H/2 25014.930 1.120

4 K° 13

/ 2 22578.175 0.995

9

/

2

22663.728 0.870

4

I

° 11 12 22696.885 0.965
143

Nd ii, Odd Parity—Continued Nd II, Odd Parity—Continued

Configuration Term J

Level (cm -1

) 9 Configuration

4/

4

( 5 I)6p

e r 7

/ 2 25044-675 0.820

9

/2 25877.1 76 0.950 “/2 26772.093 1.020

13/ 2 277U-196 1.080

15 /2 28856.898 1.160

17 /2 30246.771 1.220

ll /2 25080.880 0.990

1S /2 25120.324 1.165

7

/ 2 25138.556 1.200

9

/ 2 25190.458 1.150 u/ 2 25200.913 1.135

5/2 25218.025 1.345

lS

/2 25235.677 1.110

11/2 25286.074 1.185

7

/ 2 25295288 1.035

ll

/ 2 25352.384 1.150

15 /2 25353.631 1.190

9

/ 2 25389217 1.030

13/2 25394-612 1.138

14 /2 25481274 1.025

7 /2 25519.085 1.170 n/ 2 25561.194 1.360

7 /2 25648.870 1.230

17

/ 2 25678.424 1.135

5

/2 25745.016 1.200

9

/ 2 25771.527 0.985

7

/ 2 25844-366 1.125 U/ 2 25873.144 1.175

4/

4

( 5 I)6p

6 H° 5

/ 2 25876.559 0.655

4/

4

( 5

I)6p

7

/ 2 26640.085 0.970

9

/

27425.015 1.170 n/ 2 28285.619 1.085

13

/ 2 29434270 1.215

15

/ 2 30707282 1.205

13

/2 25918.386 1.228

15/2 26031.487 1.140

5

/2 26041212 0.940

4 I° 1S

/2 26055.1 77 1.160

9

/ 2 26108.345 1.055

5

/2 26116.051 1.250

S

/2 26170.820 1.250

ll h 26182.478 1.020

7

/ 2 26206.821 0.925

l 3

/

26210.748 1.105

9

/ 2 26227.110 1.050

11/2 26274.095 1.025

7

/ 2 26292.502 1.215

Term

4 K°

4 K

°

J

Level (cm' 1

) a

13

/ 2 26328.010 1.083

7

/

26369.065 1.285

9

/2 26380.727 1.035

7

/ 2 26422.560 1.230

1X /2 26455.191 1.090

13

/ 2 26459.602 1.250

15

/ 2 26473.775 1.231

13

/ 2 26489.150 1.150

9

/ 2 26500.422 1.085

17

/ 2 26583.980 1.223

9

/ 2 26670.590 1.155

7 /2 26702.003 1.290

1 S

/2 26738.805 1.090

9

/

26759238 1.025 u/ 2 26761.110 1.130

7

/

26793.331 1.095

7

/ 2 26907.528 1.460

9

/2 26926.997 0.990

11/2 26991.889 1.200

9

/

27014265 1.105

9

/2 27069.997 1.095

13

/ 2 27124-095 1.110

11/2 27146.571 1.225

9

/2 27179.602 0.915

9

/

27233.527 1.130

7

/ 27244-020 1.190 U/2 27245.453 0.955

l3/2 28563.485 1.044

15

/ 2 30094850 1.105

17

/2 31675295 1.180

7

/ 2 27299.543 1.015

1 S

/2 27308.940 1.090

11/2 27352280 1.035

7

/ 2 27444-545 1.070

15/2 27445.854 1.110

13/2 27448.715 1.135

7

/ 2 27504.112 1.168 H/2 27518.405 1.020

9

/2 27536.610 1.325

9

/ 2 27553.523 1.125

is

/ 2 27611.719 1.100

5

/2 27614-956 0.730

7

/ 2 27638.675 1.150

7

/

27694.620 0.725

13

/ 2 27721.442 1.175
144

Nd II, Odd Parity—Continued Nd II, Odd Parity—Continued

Configuration

4/

4

( 5 I)6p

4/

4

( 5 I)6p

4/

4

( 5 I)6p

Term J

Level (cm -1

) 9 Configuration Term J

Level (cm -1

) 9

11/2 27769.432 1.102 ls

/ 2 29362.528 1.140

9

/2 27774.135 1.025 1X/2 29425.150 1.085

1 V2 27781.770 1.130 9

/ 2 29521.740 1.075

1X

/ 2 27798.540 1.065 1X

/ 2 29581.890 1.105

7 /2 27805.385 0.970 15/ 2 29622.1 72 1.035

15/2 27816.793 1.160 13/2 29701.474 1.090

4

J

0 9

/2 27921.395 1.035

X1

/ 2 29763.763 1.077

11/2 29484-600 1.022 13/2 29813.432 1.065

13/2 31153.870 1.115

9

/ 2 15/2 32464-640 1.130 29864.657 0.993

7 /2 29878.830 1.215

ll

/ 2 27923.620 0.980

S

/2 29882.190 1.195

9

/ 2 27934.544 1.070

15/2 29955.418 1.120

9

/ 2 27990.040 1.285

S

/2 30037.077 0.800 n/ 2 27992.437 1.174

ll

/ 2 30161.616 1.047

12/2 27993254 1.175

9

/ 2 30196.783 1.052

13 /2 28089.482 1.025

ll

/ 2 30210.725 1.150 n/ 2 28129.850 1.070

5 h 30292.992 0.798

9

/ 2 28170.456 1.025

15

/ 2 30306.150 1.130

13/2 28196.156 1.070

7 /2 30321.425 1.116

4 H° 7 /2 28213.885 0.720

13/ 2 30348.340 1.125

9

/ 2 28298.462 1.072

7

/

2

30393.800 1.105

9

/

2

28340.549 1.050

1S

/ 2 30405.583 1.120

13/2 28354-410 1.130

5

/2 30431.849 0.963

7

/

2

28520.155 1.172

7

/

2

30453.341 0.990

15/2 28540.957 1.145

13/2 30467.356 1.075

1 1/2 28582.619 1.180

7

/

2

30552.490 1.005 n/ 2 28597.560 1.140

13/2 305 707222 1.014

9

/

2

28602.040 1.265

7

/

2

30571.874 1.070

13/2 28725.933 1.120

9

/

2

30659.962 0.925

15/2 28729.745 1.130

7

/

2

30681265 0.980

17 /2 28748.524 1.120

X1

/ 2 30691.068 1.005

9

/

2

28785.075 1.155

13/

2

30700.780 1.155 n/ 2 28860.164 1.110

l 7

/ 2 30781.493 1.210

13

/ 2 28899.080 1.040

5

/

2

30795.119 1.046

9

/ 2 28926250 0.890

7

/

2

30805.535 1.080

17

/ 2 29027.543 1.200

13

/ 2 1.137

1.045 30813.108

7

/

2

9

/

29036.650

30818.335 1.255 0.981

9

/

2

4 H° 29043.459

5

/2 30890.990 1.000

11/2 29079.868 1.107

7

/

2

30893.730 1.005

13/2 29088.724 1.126

7

/

2

30919.630 1.090

9

/

2

29220.567 1.160

9

/

2

30927.645 1.165

11

1 2 29239.381 1.119

1 S

/2 30952.181 1.190

15/2 29260.740 1.223

9

/

2

30990.485 1.095

9

/

2

29298.632 0.900

X1

/ 2 30995.579 1.190

X1

/ 2 | 29336.734 1.025
145

Nd II , Odd Parity—Continued Nd II , Odd Parity—Continued

Configuration Term J

Level (cm -1

) 9 Configuration Term J

Level (cm -1

) 9

i 5/2 31069.500 1.040 X1 /2 32759.589 1.030 ”/2 31085.770 1.055 9

/ 2 32798.423 1.200

7

/ 2 31128.940 1.020 13/2 32864.841 0.950

9

/ 2 31179.755 1.000 15/2 32905.325 1.080

7 /2 31186.580 1.050 9

/ 2 32918.176 1.120

13/2 31256.788 1.135 3

/2 32964210 1.140 n/ 2 31274-810 1.145 H/2 33003220 1.115

9

/ 2 31335.807 1.125 17

/ 2 33097.724 1.230

15/2 31362.117 1.020 n/ 2 33120.090 1.015

13

/2 311,05.086 1.120 11/2 33192.940 1.050 n/ 2 31438.956 1.165 17

/ 2 33215.040 1.015

9

/2 31451299 1.048 3/2 33239.917 0.950

15/2 31489.109 1.110 13

/ 2 33260.386 1.245

7

/ 2 31514.079 1.050 3/ 2 33301.335 1.210 “/» 31528.633 1.000 7

/ 2 33313.870 1.200

9

/ 2 31618213 1.250 13/2 33452.835 1.065

9

/

31692.997 1.237 3/2 33464.640 0.755

17

/ 2 31818.517 1.180 V2 33520220 0.750

9

/

31834-827 1.089 17

/ 2 33526.500 1.110

7

/

31844.813 0.945 5

/2 33542.165 0.810

13/2 31857296 1.180 13/2 33556.696 1.015

15/2 31878.132 1.178 V2 33640.336 1.050

11/2 31900.596 1.185 ll

/ 2 33719.088 1.110

9

/

31944-650 1.071 13/2 33759.632 1.063

9

/

31993.640 0.957 il

/ 2 33792.430 1.210

7

/

32008.576 1.083 13

/ 2 33809.180 1.190

15/2 32093.646 1.130 1 h 33820.330 0.750

7

/ 2 32123.441 1.022 5

/

33861.325 1.170 n/2 32144-445 1.190 17

/ 2 33884238 1.210

9

/

32165264 0.970 3/2 33940.640 0.850

9

/

32192.051 1.060 13/2 34001.428 1.090

S

/2 32194-110 0.990 13/2 34087.960 1.150

S

/2 32211.650 1.135 17/2 34119.145 1.165

15/2 32221.573 1.139 n/ 2 34127.822 1.050

9

/

32253.730 0.985 3/2 34133.460 1.295

11/2 32375.051 1.095 3/2 34226.090 1.700

7

/

32394-087 1.240 "/2 34227.182 1.160

13

/ 2 32397.555 1.080 3/

34241-915 1.060

15/2 32423.943 1.030 1 h 34323.300 0.450

11

/ 2 32444-090 1.095 13/2 34399.930 1.165

9

/

32482.730 1.160 3/2 34515.860 1.095 “/2 32522.136 0.910 9

/

34526.890 1.125

11

/ 2 32650.760 1.110 15/2 34555.732 1.238

9

/

32671.367 1.185 3/2 34563.810 0.920
146

Nd II, Odd Parity—Continued Nd H, Odd Parity—Continued

Configuration Term J

Level (cm -1

) 9 Configuration Term J

Level (cm -1

) 9

5 /2 34632230 1.150 7

/

2

36393.740 0.970

15/2 34671.738 1.115 9/2 3641 7.060 1.235

13/2 34689408 1.085 V2 36434-470 1.300

5

/2 34695.523 1.440 l3 /2 36444.422 1.138

7 /2 34709.105 1.095 11/2 36512.740 1.015

7

/ 2 34746.565 1.130 V2 36553.810 2.280

7

/ 2 3481 7220 0.835 7

/ 2 36571.480 1.070

15/2 34841.070 1.130 3

/ 2 36577.063 1.280 V2 34856.400 0.935 7

/ 2 36621.025 1.160

5/2 34870.455 1.040 3

/ 2 36706.520 1.520

! 5/2 34895.820 1.175 9

/2 36707.400 1.205

S/2 34938.750 1.100 7 /2 36711.050 1.090

7 /2 34982.943 1.170 13

/2 36728.888 1.085

7

/ 2 35056.130 0.990 5

/ 2 36785.935 1.130

7

/ 2 35094.035 1.085 5

/2 36814.090 1.215

5

/ 2 35100.115 1.135 3

/ 2 36838.640 1.220

3/2 35124.315 0.885 9

/

2

37041.760 1.100

5

/2 35165.905 0.970 S /2 37041.905 1.230

9

/2 35169.610 1.175 “/* 37128.550 1.300 U/2 35225210 1.240 18/2 37149.107 0.988

13/2 35241.818 1.095 13/2 37262.720 1.023

7

/

2

35280.020 1.060 13/2 37294270 1.135

9

/2 35331.480 1.030 9

/

2

37354290 1.135

X /2 35344-395 0.435 7

/

2

37366.520 1.285

13/2 35403.450 1.175 5

/

2

37406260 1.045

7

/ 2 35444230 1.300 7

/

2

37434-915 1.610

3

/2 35447.030 1.125 n/ 2 37485.698 1.330

5/2 35496.685 1.005 13/2 37495.400 1.055

9

/

2

35606.691 1.035 5

/2 37635.835 0.985

15/2 35609220 1.240 11

/ 2 37637.360 1.055

7 /2 35651.980 0.940 13

/ 2 37640.530 1.035

3

/

2

35681.400 1.200 5

/2 37720.755 1.355

3

/ 2 35734-450 1.435 7

/

2

37722.765 1.285

S /2 35819.425 0.905 S

/2 37741260 0.800

9

/ 2 35871.490 1.015 7

/ 2 37764.315 1.078

7

/ 2 35882.880 1.138 9

/ 2 38152.895 1.195

5

/2 35962.900 1.375 9/ 2 38179.875 1.240

9

/ 2 35985.780 1.070 “/2 38253.770 1.100

S

/2 35996.995 0.990 15/2 38283.040 1.040

9

/ 2 36035.510 1.155 18/2 38297.145 0.955

5/2 36138.560 1.375 ”/2 38318.970 0.910

15/2 36169.872 1.165 13/2 38429.465 1.330

7

/ 2 36262.706 1.115 15/2 38432.360 1.120

S

/2 36384.680 1.210 11/2 38484.820 1.170

11/2 38787.450 1.085
147

Nd II, Odd Parity—Continued Nd H, Odd Parity—Continued

Configuration Term J

Level (cm -1

) 9 Configuration Term J

Level (cm -1

) 9

15

/2 38790275 1.045 9

/2 39603.150 1.220

ll/2 38867.790 1.190 13/2 39825.830 1.040

X 3/2 39057.860 1.033 15/2 39858.695 1.004

• 15/2 391 72.735 0.968 15

/ 2 39953.440 1.007

13/2 39176490 1.058 5

/ 2 40269.060 1.200 V2 39290.645 1.450 Va 40508.920 1.340

11/2 39366.377 1.195 is/2 40919.565 1.052

i 5/2 3$JfO Jfj2 1

1.140

13/2 39574-030 1.010 Nd III ( 5

I 4 ) Limit 86500
148

Nd III

(Ce i sequence; 58 electrons) Z=60

Ground state (ls 2 2s 2 2p6 3s 2 3pfi 3d 10 4s 2 4p6 4d 10 5s 2 5pfi ) 4f

4 5 I 4

Ionization energy 178600 ± 2400 cm 1 22 . 1 ± 0.3 eV

The levels and eigenvector percentages are from unpublished material furnished by

Crosswhite, who is continuing her analysis of this spectrum. The line list for Nd ill has about

9500 lines extending from 1810 A to 8715 A. Transitions from upper 4/ :i 5d levels to the 4/ 4 5 I ground-term levels account for all the lines now classified. Sugar and Reader derived the ionization energy.

References

Crosswhite, H., unpublished material (1975, 1976). EL PT

Sugar, J., and Reader, J., J. Chem. Phys. 59, 2083 (1973). IP

[January 1977]

Nd III

Configuration Term J

Level (cm 9

Leading percentages

4f4

5

I 4 0.0 98 5 1137.8 99 6 2387.6 99 7 3714.9 99 8 5093.3 97

4/3( 4 I°)5d 5 K° 5 152622 88 8 ( 4 D 3 F

6 16938.1 94 4 ( 4 I°) 3J° 7 18656.3 98 1 ( 4 I°) 3J° 8 20410.9 98 1 ( 4 I°) 3 L°

9 22197.0 96 3 ( 4

I°) 3 L°

4/3

( 4 I°)5d 5 I° 4 18883.7 83 13 ( 4 I°) 3H

° 5 20388.9 79 12 ( 4 I°) 3H

° 6 22047.8 71 8 ( 4 I°) 3H

° 7 22702.9 52 24 ( 4I°) 3 I° 8 24686.4 83 13 ( 4 I°) 3 K

°

4/3

( 4 I°)5d 5 H° 3 19211.0 69 18 ( 4 I°) 3Q°

4 20144.3 55 22 (4

I°) 3 H°

5 21886.8 62 18 ( 4I°) 3J° 6 23819.3 45 30 ( 4I°) 3 I° 7

4/3

( 4 I°)5d 7 240032 35 *i° 27 ( 4 I°) 3J°

4/3

( 4 I°)5d 6 265032 38 5G

° 32 ( 4 I°) 3 H°

4/3( 4 I°)5d 3 K° 8 27391.4 67 13 ( 4 I°) 5I

o

4/3

( 4 F°)5d 3 27569.8 36 5 H

° 15 ( 4 F°) 5 D°

4/3

( 4F°)5d 5 H° 3 277882 49 15 ( 4F°) 5D°

4 28745.3 83 7 ( 4 I°) s H

°

5 30232.3 58 11 ( 4 F°) 5G°

6 31394-6 46 18 ( 4 F°) 5G°

7 32832.6 44 32 ( 2 H°2) 3 K°

4/3( 4 F°)5d 5 29397.3 27 5 H° 17 ( 2H°2) 3I°

Nd IV ( 4I§/2) Limit 178600
[Nd IV]

149

(La i sequence; 57 electrons) Z=60

Ground state (ls 2 2s 2 2p6 3s 2 3p6 3d 10 4s 2 4p6 4d 10 5s 2 5p6

) 4/ 3 *1%I2

Ionization energy 326000± 3000 cm 1 40.4± 0.4 eV

No analysis of the spectrum of the free ion has been published. Irwin [1968] lists about

1000 of the strongest Nd lines he obtained using a spark source (1271-3109 A). A number of

lines were classified as 4/ 3 4 I° —4/

2 5d, 4/2

(

3 H)6s—4/2

(

:! H)6p, or 4/ 2

( s H)5d—4/

2

( 3 H)6p

transitions in Nd IV, but no connection between any of the three resulting systems was found.

We have not given the levels of these systems, pending confirmation by a more complete

analysis.

The levels of the 4/ 3 configuration listed here are based on analysis of the spectrum of

triply ionized Nd in a LaCls host crystal [Crosswhite, Crosswhite, Kaseta, and Sarup, 1976],

Crosswhite et al. give the 4/ 3 levels to almost 40000 cm'1

; the list here is complete to 20000 cm

-1

, with the levels being adjusted to a value of zero for the ground level and rounded off to the nearest 10 cm' 1

. Dieke [1968] gives references for much of the work on the crystal spectra

and analyses.

Crosswhite et al. calculated the eigenvector percentages.

The ionization energy is from Sugar and Reader, with the value rounded off to three

significant figures and the estimated error doubled [Spector and Sugar, 1976],

References

Carnall, W. T., Fields, P. R., and Rajnak, K., J. Chem. Phys. 49, 4424 (1968). [EL] [CL] [W] PT

Crosswhite, H. M., Crosswhite, H., Kaseta, F. W., and Sarup, R., J. Chem. Phys. 64, 1981 (1976). [EL] [ND] [CL] [W]

PT

Dieke, G. H., Spectra and Energy Levels of Rare Earth Ions in Crystals, Ed. H. M. Crosswhite and H. Crosswhite, pp. 202-232 (Interscience Publishers, New York, 1968). [EL] [CL] [W] [ZE]

Irwin, D. J. G., Thesis, Johns Hopkins Univ., Baltimore, 102 pp. (1968); (Univ. Microfilms, Ann Arbor, Mich., No. 69-

21084). EL CL W PT

Rajnak, K., J. Chem. Phys. 43, 847 (1965). [ND] PT

Spector, N., and Sugar, J., J. Opt. Soc. Am. 66, 436 (1976). Sugar, J., and Reader, J., J. Chem. Phys. 59, 2083 (1973). IP Wybourne, B. G., J. Chem. Phys. 34, 279 (1961). PT

[October 1976]
150

[Nd IV]

Configuration Term J

Level (cm -1

) Leading percentages

4/3 4JO 9

/

2

0 97 3

2 H°2

n/2 [1880] 99 1 2 H°2

13/2 [3860] 100

15/2 [5910] 99 1 2 K°

4/3 4JT° 3

/2 [11290] 94 5

2 D°1

5

/2 [12320] 98 2

2 D° 1

7 /2 [13280] 93 4

2G°1

9

/

2

[11/570] 75 20 2 H°2

4/3 2 H°2 9

/

2

[121/70] 54 14 4p°

ll/2 [15800] 80 13 2 H°1

4/3 4 go 3

/2 [13370] 95 5 2p°

4/3 4 G

° 5

/2 [16980] 99 1 2 F°2

7

/

2

[18890] 59 24 2G°1

9

/2 [19290] 76 7

2G°1

X1

/2 [21280] 92 4

2 H°1

4/3 ? /2 [17100] 41 4 G° 31 2G°1

4/3 2 K° 1 3

/ 2 [19UO] 99 1 2 r

15 /2 [21430] 94 5

2 L°

Nd v ( 3 H4 ) Limit 326000
PROMETHIUM

Pm I

61 electrons Z=61

Ground state (ls 2 2s 2 2pfi 3s 2 3p,i 3d 10 4s 2 4p'1 4(i

in 5s 2 5p,i ) 4/ ft 6s2

Ionization energy 44800± 160 cm" 1 5.554± 0.020 eV

All known isotopes of Pm have relatively short half-lives, and the element first became

available after Marinsky, Glendenin, and Coryell [1947] separated and identified two of its isotopes from other fission products of uranium [Marinsky and Glendenin, 1948], The various

observations of Pm spectra have been carried out with sources containing the 147 Pm isotope,

which is produced in nuclear reactors and has a half-life of 2.6 years.

In 1951 Meggers, Scribner, and Bozman published wavelengths and estimated relative

intensities for more than 2200 Pm lines excited in arc and spark sources (2337-6873 A). An

experimental separation of the lines according to ionization stage was not feasible with these

sources, but the authors thought it probable that most of the lines belonged to Pm n. They

pointed out the futility of attempting an analysis until more complete and accurate data could

be obtained.

In 1967 Reader and Davis published “the first results of our investigation to determine

the electronic structure of neutral promethium,” noting that “our experimental investigation of

the spectrum of promethium has extended over several years, and has included the taking of

hundreds of spectrograms on several instruments, under many different conditions.” This first analysis of Pm I yielded the 2 low 4/ 5 6s 2 terms and 209 upper even levels classifying 714 lines. No more complete list of Pm i lines has yet been published.

The levels and all except two of the g values given here are from Reader and Davis. The

even level at 27083.92 cm" 1 (J=1%) was given incorrectly as 27383.92 cm" 1 in their 1967 paper. The estimated uncertainty of the low odd levels is ±0.01 cm" 1

, and the even levels are accurate

to about ±0.03 cm" 1

. The g values quoted for the 4/ 5 6s2 6 H°/2 and fi H[]/2 levels were obtained from atomic-beam

magnetic-resonance measurements by Budick and Marrus [1963] and by Cabezas, Lindgren,

and Marrus [1961], respectively. The respective uncertainties are 0.0004 and 0.004. Cabezas,

Lindgren, and Marrus obtained J and g values for both the fi H°/2 and 6 Hg/2 levels, and were able

to conclude that the ground level was almost certainly 4/ 5 6s2 6 H°/2 . The eigenvector percentages for the levels of the two low 4/ 5 6s 2 terms are from a calculation by Conway [1965]. He essentially repeated the calculation by Conway and

Wybourne [1963], whose published results included eigenvectors only for levels below 5000

cm" 1

. (In table III of Conway and Wybourne, the last of the four 4 G° components in the

eigenvector for the 4/ 5 6s2 fi H°/2 level should have seniority 3; and the four 4 F° components

listed for the fi H°1/2 level are

4 G° components, in the same order as for the lower i; H

0 levels.)

Judd, Crosswhite, and Crosswhite [1968] made an improved calculation of Pm i 4/ a 6s2

, based

partially on the experimental levels of the two low terms. They included spin-spin and spinother-orbit interactions, as well as the Trees a parameter. The resulting values of the main

(electrostatic and spin-orbit) parameters are significantly larger than the values assumed by

Conway and Wybourne.

Reader and Davis [1967] note that most of the upper levels found by them must belong

mainly to 4/ r’6s6p or 4/ 4 5e?6s 2

, and conclude on the basis of certain arguments that the latter configuration is preponderant.

The ionization energy is from Reader and Sugar.
152 Pm I—Continued

References

Budick, B., and Marrus, R., Phys. Rev. 132, 723 (1963). ZE Hfs

Cabezas, A. Y., Lindgren, I., and Marrus, R., Phys. Rev. 122, 1796 (1961). ZE Hfs Conway, J. G., unpublished material (1965). PT

Conway, J. G., and Wybourne, B. G., Phys. Rev. 130, 2325 (1963). PT

Judd, B. R., Crosswhite, H. M., and Crosswhite, H., Phys. Rev. 169, 130 (1968). PT

Klinkenberg, P. F. A., and Tomkins, F. S., Physica (Utrecht) 26, 103 (1960). Hfs

Marinsky, J. A., and Glendenin, L. E., Chem. Eng. News 26, 2346 (1948). Marinsky, J. A., Glendenin, L. E., and Coryell, C. D., J. Am. Chem. Soc. 69, 2781 (1947). Meggers, W. F., Scribner, B. F., and Bozman, W. R., J. Res. Nat. Bur. Stand. (U.S.) 46, 85 (1951). W

Reader, J., and Davis, S. P., J. Opt. Soc. Am. 53, 431 (1963). Hfs

Reader, J., and Davis, S. P., J. Res. Nat. Bur. Stand. (U.S.) 71A, 587 (1967). EL CL ZE

Reader, J., and Davis, S. P., unpublished material (1974). EL

Reader, J., and Sugar, J., J. Opt. Soc. Am. 56, 1189 (1966). IP

[October 1976] Pm I

Configuration Term J

Level (cm -1

) 9 Leading percentages

4/5 6s

2 6 H

° 5

/2 0.00 0.305 96 2

4G°4

7

/ 2 803.82 0.8279 97 2

4G°4

9

/ 2 1748.78 1.068 98 1 4 G°4 u/ 2 2797.10 1.205 98 1 4

I °3

13

/2 3919.03 1.307 97 2

4

I °3

15

1

2

5089.79 1.33 95 4

4

I °3

4/5 6s

2 ep° v2 5249.48 - 0.68 97 1 4 D°2

3

/ 2 51, 60.50 1.051 95 1 4 F°3

5

/ 2 5872. 81, 1.239 94 2

4 F°3

? /2 6562.86 1.385 95 3

4 F°3

9

/2 7497.99 1.440 96 2

4 F°3 n/ 2 860921 1.458 97 1 4G°3

7

/ 2 17104.72 0.885

3

/ 2 20006.04 0.068

7

/ 2 20157.85 0.503

5

/ 2 20265.98 0.527

5

/2 20517.96 0.659

5

/2 20567.76 0.910

7 /2 20660.00 1.114

5

/2 20675.81 1.075

7 /2 20909.00 0.929

7 /2 21100.10 1.319

7 /2 21143.06 0.977

9

/2 21237.49 0.841

7

/ 2 21348.22 0.815

7

/ 2 21371.05 0.927

3

/

2

21590.60 0.135

»/2 21625.45 1.117

5

/ 2 21657.89 1.01

7

/ 2 21666.80 0.696

9

/2 21732.93 1.137

9

/ 2 21920.49 0.986

3

/ 2 21946.12 - 0.01

7

/

2

21976.26 1.218
153

Pm I —Continued Pm I—Continued

Configuration Term J

Level (cm -1

) 9 Configuration Term J

Level (cm -1

) g

3h 22013.40 0.887 7

/ 2 23743.96 1.111

S

/2 22080.08 0.571 n/2 23760.57

7

/ 2 22084.65 0.858 3

/ 2 23926.91 1.754

9

/

22205.44 0.974 13

/ 2 23938.76 1.044 V2 22259.21 -0.32 13

/ 2 24013.29 1.29

9

/2 22294.96 1.245 11

/ 2 24038.82 1.08

5

/2 22301.24 0.976 9

/ 2 24071.03 1.12

7

/

22309.94 0.850 3

/ 2 24091.39 1.395

9/2 22355.68 1.374 13

/ 2 24122.41

3

/2 22388.06 0.84 13/2 24180.80 1.28

il

/ 2 22414.17 1.12 7

/ 2 24204.37 0.670

5

/2 22425.58 0.83 9

/ 2 24234.42

11 12 22446.20 1.531 13

/ 2 24245.66 1.14

9

/

22456.72 0.936 9

/ 2 24338.33 1.17

S

/2 22522.90 0.735 7

/ 2 24418.44 1.124

9

/

22586.77 1.283 18/2 24443.15 1.17

7

/ 2 22654.34 0.84 9

/ 2 24443.57 1.037

5/2 22656.68 0.936 7

/ 2 24471.10 0.83 n/ 2 22761.33 1.296 U/ 2 24503.45 1.22 n/2 22817.13 1.134 13

/ 2 24520.23 1.34

5

/2 22905.24 1.16 ll/ 2 24533.27 1.183

7 /2 22934.70 1.237 9

/ 2 24558.56 1.39

ii/ 2 23006.35 9

/ 2 24627.53 0.961

il/2 23033.95 1.0 li/2 24681.68 0.895

7

/

23178.13 1.150 1S

/ 2 24705.25 1.102

5

/

23188.54 1.48 9

/ 2 24754.58 0.888 “/2 23198.33 1.12 is/2 24770.04 1.17

9

/

23276.10 0.83 9

/ 2 24789.86 1.08

7

/

23278.90 1.0 n/2 24884.90

5

/2 23334.10 0.571 ii/ 2 24912.34 1.29

7

/

23337.53 1.257 n/2 25104.27 1.15 U/2 23345.07 1.323 is/ 2 25306.07 1.21

9

/

23435.40 1.00 3

/ 2 25351.46 0.58

5

/

23443.79 0.784 lx

/2 25357.24

9

/

23480.63 1.16 il/2 25402.61 1.211 n/2 23501.57 1.283 13

/ 2 25405.29 1.034

5

/2 23538.86 0.780 9

/ 2 25448.28 1.14

11 h 23550.60 1.170 15

/ 2 25474.46

9

/ 2 23571.27 1.26 9

/ 2 25521.55 0.910

? /2 23584.31 1.123 18/2 25537.36 1.39

13/2 23629.06 1.09 15/2 25618.77 1.13

7

/

23712.56 1.181 X1

/ 2 25755.17 1.016 V2 23732.57 3.24 13 /2 25919.50 1.26

13/2 23740.42 11/2 26015.94

225-298 0 - 78-11
154

Pm I —Continued Pm I —Continued

Configuration Term J

Level (cm" 1 ) 9

Configuration Term J

Level (cm -1

) 9

V2 26065.63 -0.36 3

/ 2 27919.29 1.31

17/2 26080.99 1.29 5

/

2

27923.37 0.869

17/2 26096.75 1.25 9

/ 2 27939.87 1.025

13/2 26101.28 7 /2 28008.09

ll l2 26103.56 1.2 13/2 28030.99 1.39

13/ 2 26181.98 1.55 9

/2 28075.94 1.155

7

/

2

26211.44 0.715 5

/2 28084.28 0.904

9

/

2

26237.84 1.43 n/2 28086.21 1.150

13/2 26282.20 0.95 7

/

2

28150.73 1.071

7

/

2

26285.02 0.877 5/2 28153.69 0.632

‘/2 26300.30 0.955 7 /2 28169.71 0.9

13/2 26456.26 7

/

2

28186.31 1.98 Va 26468.80 -0.45 V2 28196.56 2.44

3

/ 2 26479.61 0.731 7

/

2

28273.52 0.764

3/2 26522.35 1.135 9

/

2

28274.21 1.055

17

/ 2 26545.85 1.14 7

/

2

28325.13 1.38

13/

2

26555.44 1.07 5

/2 28338.98 0.963

13

/2 26591.40 1.10 7/

2

28467.52 0.87

5

/2 26609.39 0.56 9

/

2

28490.35 1.123

5

/

2

26630.56 0.32 9

/

2

28565.66 1.0 “/a 26694.38 1.095 9

/2 28607.33 1.079

5

/2 26695.79 3

/

2

28608.57 1.740

1S/2 26703.97 1.30 V2 28657.02 0.29

3

/

2

26725.52 0.65 7

/

2

28680.26 0.88

3

/ 2 26830.74 0.794 “/2 28994.90 1.30

5

/2 26841.36 1.38 3

/

2

29002.94 0.99

15

/ 2 26955.22 9

/

2

29074.03

5

/ 2 27036.66 0.931 9

/2 29129.60 1.162

15/ 2 27042.18 9

/2 29161.96 1.0

15/ 2 27083.92 H/2 29242.64 1.259

i 5

/ 2 27109.75 n/ 2 29585.21 1.2

5

/2 27245.99 0.761 9

/

2

29595.58 1.04

7

/2,9/ 2 27272.46 0.8 9

/2 29648.42

15

/ 2 27304.15 1.44 11/2 29705.77

7 /2 27319.28 1.274 ”/a 29757.69

5

/2 27334.48 0.947 9

/

2

29784.08

7 /2 27351.42 0.92 X1 /2 29856.72 1.10

3

/ 2 27468.45 0.21 7

/ 2 29883.87 1.199

7

/ 2 27476.28 1.077 9

/ 2 29908.90

5

/ 2 27512.95 0.913 ll h 29960.42 1.18

13/2 27596.27 1.29 11/2 30008.40 1.28

7

/ 2 27621.74 9

/ 2 30063.62 1.224

3

/ 2 27685.89 2.049 11

/ 2, 18/2 30251.50 1.2

9

/2 27829.89 1.024 13/2 30281.98
155

| Pm I

Continued Pm I-—Continued

Configuration Term J

Level (cm -1

) 9

Configuration Term J

Level (cm -1

) 9

11 la 30374.95 1.226 9

/ 2 32022.32

13

/ 2 30457.44 1.226 13/ 2 32435.06 n/2 30541.28 15la 33180.50 1.285

9

/ 2 30726.26 9

/ 2 33246.65

9

/2 30785.03 n/2 31103.24 Pm II ( 7 H2 ) Limit hhSOO

11

/ 2 31846.70
156

Pm II

(Nd i sequence; 60 electrons) Z=61

Ground state (ls 2 2s 2 2p6 3s 2 3pfi 3d 10 4s 2 4pfi 4d 10 5s 2 5p6

) 4/ s 6s 7 H

0

2

Ionization energy 87900± 600 cm' 1 10.90± 0.08 eV

Davis and Reader have reobserved the Pm spectrum and “have prepared a line list with

about 17500 entries from 3100 to 10000 A, including lines from both neutral and singly ionized

species. Most of the lines are not clearly separated according to ionization state” [1972a], Some

2000 lines have been classified by energy levels, but the new line list has not been published.

The 1951 list of Meggers, Scribner, and Bozman (described under Pm i) thus remains the most

complete published table of wavelengths for Pm n. (Davis and Reader have confirmed that

practically all of the strong lines in this list belong to Pm n.)

The levels, g values, and eigenvector percentages are from the unpublished and as yet

incomplete analysis by Davis and Reader [1972b], The calculation of the 4/ 5 6s levels was

carried out with matrices that included off-diagonal spin-orbit elements only between (quintet

and septet) states having the same 4/ 5 sextet parent term. The resulting purity (leading

percentage) is given for each level in both the LS and J x s coupling schemes. Although these

levels have sometimes been assigned J,s designations, it is apparent that LS coupling is more

appropriate.

No attempt has yet been made to interpret the upper even levels, about 150 of which have

been found.

The ionization energy is from Sugar and Reader.

References

Davis, S. P., and Reader, J., J. Opt. Soe. Am. 62, 1370A (1972a). EL

Davis, S. P., and Reader, J., unpublished material (1972b). EL CL W ZE PT

Klinkenberg, P. F. A., and Tomkins, F. S., Physica (Utrecht) 26, 103 (1960). Hfs

Meggers, W. F., Scribner, B. F., and Bozman, W. R., J. Res. Nat. Bur. Stand. (U.S.) 46, 85 (1951). W

Reader, J., Phys. Rev. 141, 1123 (1966). Hfs

Reader, J., and Davis, S. P., J. Opt. Soc. Am. 53, 431 (1963). Hfs

Sugar, J., and Reader, J., J. Opt. Soc. Am. 55, 1286 (1965). IP

[October 1976]

Pm II

Configuration Term J

Level (cm -1

) 9 Leading percentages

4/ 5

( 6H°)6s 7 H° 2 0.00 0.000 100 or 100 ( 6 H§/2) ( 5/2,V2)° 3 446.1*5 0.728 89 or 62 ( 6H§/2) ( 5

/2,

1 /2)° 4 1133.45 1.038 89 or 79 ( 6 H?/2) ( 7/2,V2)° 5 1983.52 1.190 92 or 88 ( 6 H§/2) ( 9/2,V2)° 6 2950.31 1.29 95 or 93 ( 6 ffil/2) ( U/2,V2)° 7 4000.15 1.34 97 or 97 ( 6 Hl3/2) ( 13/2,V2)° 8 100 or 100 ( 6Hf5/2) ( 15

/2, 1 /2

)°

4/5

(6 H°)6s 5 H° 3 1602.97 0.531 89 or 62 ( 6 Ht/2 ) ( 7

/2 , 1 /2

)° 4 2666.76 0.920 89 or 79 ( 6HI/2) ( 9

/2,

1 /2)° 5 3812.31 1.10 92 or 88 ( 6HIl/2) ( 11

/2,

1 /2)° 6 5017.77 1.20 95 or 93 ( 6Hl3/2 ) ( 13/2,V2

)° 7 97 or 97 ( 6 Hl5/2 ) ( 15

/2,

1 /2)°
157

Pm II—Continued

Configuration Term J

Level (cm' 1 ) 9 Leading percentages

4/5

(6F°)6s 7p° 0 5280.88 100 or 100 ( 6Fi/2) (

x /2,

2)

0

1 539146 1.493 99 or 53 ( 6Fi/2 ) (72,72)° 2 563240 1.481 98 or 74 ( 6F§/2) ( 3

/2,

1 /2)° 3 6048.50 1.482 96 or 87 ( 6 Fi/2) ( 5

/2,V2)° 4 6705.18 1.50 96 or 94 ( 6F?/2) ( 7

/2,

2 F

5 98 or 97 ( 6F§/2) ( 9/2,V2)° 6 100 or 100 ( 6Ff 1 / 2 ) (“A-,

2)

0

4/5( 6 H°)5tf 7R0 4 5332.36 0.412 5

6

78

9

10

4/' 5

( 6 F°)6s 5p° 1 662940 0.00 99 or 53 ( 6F§/2) ( 3/2, V2)

0 2 7012.87 1.010 98 or 74 ( 6FI/2) ( 5

/ 2,V2)° 3 7701.09 1.23 96 or 87 ( G Ft/2) ( 7/2,V2)° 4 96 or 94 ( 6F§/2) ( 9

/2, V2)

0

5 98 or 97 ( 6Fll/2) ( n/2,V2)°

3 15543.14

2 15968.09 0.365

5 17561.95

5 17609.00

6 17610.00

5 17612.84

5 17712.15

6 17834.96

5 18419.45

5 18635.29

6 18687.53 1.09

6 18736.10

6 19114.25 6 19750.03 1.1 6 20134.63

7 21139.14

2 22377.66 1.62

2 22774.24 0.571

3 23261.30 0.617

5 23302.12

2 23499.82 0.467

4 23541.00 1.168 3 23761.98 0.840 2 24023.04 0.36 3 24024.75 0.962

4 24157.20 0.855

4 24311.93 0.693

2 24404.51 1.073

4 24464.73 1.039

3 24466.32 0.743
158

Pm II—Continued Pm II —Continued

Configuration Term J

Level (cm 1 ) 9 Configuration Term J

Level (cnr 1

) 9

2 24505.57 0.961 1 27616.10 2.863 3 24527.89 0.533 3 27622.53 1.271

4 24762.58 0.990 6 27645.16 1.1

5 24771.46 1.160 7 27678.03

3 25006.51 0.806 3 27765.61 0.906

5 25015.69 1.110 3 27848.71 1.164

6 25094.33 1.17 4 27894.03 0.69

4 25099.22 0.74 3 27991.45 1.161

4 25213.82 1.008 5 28061.10

5 25258.71 7 28066.15 123

4 25264.46 0.912 4 28133.56 1.037

2 25323.09 0.09 3 28166.72 1.040

5 25365.66 1.14 4 28227.39 1.19

1 25447.33 1.194 6 28271.15

5 25598.60 5 28296.71

2 25726.08 1.317 5 28324.75

3 25737.07 0.883 4 28401.54

2 26017.92 0.861 5 28444.27

6 26027.56 1.16 6 28487.33 0.98

5 26038.04 0.95 2 28499.09 1.803

4 26067.53 1.156 5 28507.50

5 26132.87 0.943 1 28507.58 1.88

6 26169.85 1.20 7 28516.85 1.20

5 26309.89 1.116 5 28642.00 1.178

2 26320.95 0.714 4 28765.64

6 26392.53 1 28819.06 0.74

3 26460.58 1.273 4 28930.06 1.024

5 26574.58 5 29057.65 1.13

3 26771.13 0.622 5 29368.84

6 26834.20 1.11 4 29400.84

4 27005.58 1.073 4 29468.44 0.96

2 27094.25 0.226 6 29586.34 1.11

6 27097.38 1.18 6 29662.69 1.13

7 27110.08 5 29693.40 0.99

4 27115.95 1.26 1 29802.52 0.12

3 27126.19 1.053 5 29863.62

4 27230.36 0.97 5,6 29967.46

2 27256.71 0.88 6 29987.92 1.22

5 27356.20 6 30089.49

6 27379.79 1.0 2 30142.21 1.110

4 27399.87 1 30172.01 0.534

5 27438.30 2 30216.86 1.015

3 27526.77 1 30402.81 1.123

2 27587.88 0.98 3 30477.48 1.374
159

Pm II —Continued Pm II—Continued

Configuration Term J

Level (cm ') 9

Configuration Term J

Level (cm -1

) 9

5 30532.47 5 32551.40 12

5 30547.86 2 32700.82 1.198

1 30612.37 0.32 3 32755.89 1.457

6 30688.69 1.28 2 32847.03 1.47

3 30736.73 1.117 2 32947.27 1.49

7 30814.52 1 32973.73 0.95

2 30996.26 0.901 6 32974.29

3 31085.12 1.11 1 33067.34 1.44

5 31251.94 3 33079.50 1.536

6? 31367.37 2 33111.77 0.71

3 31474.36 1.081 1 33272.56 0.990

4 31558.10 0.94 2 33380.55 1.23

2 31632.30 1.05 1 33551.90 1.322

3 31778.84 1.137 1 33641.58 1.980

4 31805.86 1.02

7 31851.14 Pm m(6Hs/2) Limit 87900

2 32321.10 1.581

2 32420.83 1.18
160

Pm ill

(Pr i sequence; 59 electrons) Z=61

Ground state (ls 2 2s 2 2p6 3s 2 3p'i 3d 10 4s 2 4pfi 4d 10 5s 2 5pfi ) 4/ 5 fi H5/2

Ionization energy 180000± 3000 cm” 1 22.3± 0.4 eV

Although this spectrum has not been analyzed, the above designation of the ground state

is not in significant doubt. The uncertainty of the ionization energy given by Sugar and Reader

has been rounded off to one significant figure.

Reference

Sugar, J., and Reader, J., J. Chem. Phys. 59, 2083 (1973). IP

[October 1976]
161

[Pm IV]

(Ce i sequence; 58 electrons) Z=61

Ground state (ls 2 2s 2 2pfi 3s 2 3p fi 3d 10 4s 2 4pfi 4d 10 5s 2 5pfi ) 4/ 4 5 I 4

Ionization energy 331000± 5000 cm" 1 41.1±0.6 eV

The spectrum of the free ion has not been analyzed. Carnall, Crosswhite, Crosswhite, and

Conway have given the most complete interpretation of the spectrum of the Pm:f+ ion in a LaCl:! host crystal. Using both absorption and fluorescence spectra, they derived the 4/ 4 levels up to 31690 cm

-1

. Only the levels of the three lowest terms are given here, the positions listed by Carnall et al. [1976] having been adjusted to a value of zero for the ground level and

rounded off to the nearest 10 cm" 1

. Carnall et al. evaluated the levels by first fitting a calculation to the experimental sublevels and then recalculating the levels with the crystalfield parameters set equal to zero. (Shifts of the levels due to the nephelauxetic effect are, of

course, not removed by this procedure.) The eigenvector percentages are also from their

calculation.

Carnall et al. [1976] took most of the energy levels based on absorption spectra from the

measurements of Baer, Conway, and Davis [1973], Gruber and Conway [1960] first observed

the absorption spectrum using solutions, and the analysis by Carnall, Fields, and Rajnak [1968] was also based on solution absorption data. Sugar and Reader derived the ionization energy, which has been rounded off to three

significant figures. Following the suggestion of Spector and Sugar, we have approximately

doubled the estimated uncertainty.

References

Baer, W., Conway, J. G., and Davis, S. P., J. Chem. Phys. 59, 2294 (1973). [EL] [CL] [W] PT

Carnall, W. T., Crosswhite, H., Crosswhite, H. M., and Conway, J. G., J. Chem. Phys. 64, 3582 (1976). [EL] [CL] [W] PT

Carnall, W. T., Fields, P. R., and Rajnak, K., J. Chem. Phys. 49, 4424 (1968). [EL] [CL] [W] PT

Crozier, M. H., and Runeiman, W. A., J. Chem. Phys. 35, 1392 (1961). ND PT

Gruber, J. B., and Conway, J. G., J. Inorg. Nucl. Chem. 14, 303 (1960). [W]

Hiifner, S., Z. Phys. 165, 397 (1961). ND PT

Spector, N., and Sugar, J., J. Opt. Soc. Am. 66, 436 (1976). Sugar, J., and Reader, J., J. Chem. Phys. 59, 2083 (1973). IP

[October 1976]

[Pm iv]

Configuration Term J

Level (cm -1

) Leading percentages

4r

5

I 4 0 97 2

3 H4

5 [1490] 98 1 3 H4

6 [3110] 99 7 [4820] 98 1 3 K2

8 [6580] 96 3

3 K2

4/4 5 F 1 [12230] 95 4

3 D1

2 [12670] 94 3

3 D1

3 [13520] 95 1 3 F3

4 [14470] 91 3

3G2

5 [15800] 92 4

3G2

4/4 5 S 2 [14100] 94 5

3P2

Pm v CPU-) Limit 331000
SAMARIUM

Sm I

62 electrons Z=62

Ground state (ls 2 2s 2 2p6 3s 2 3p6 3d 10 4s 2 4p6 4d 10 5s2 5p6

) 4/ fi 6s 2 7 F„

Ionization energy 45519± 8 cm 1 5.6437± 0.0010 eV

Identified even configurations 4/ fi 6s 2

, 4/ r’5d6s, 4/ fi 6s7.s

Identified odd configurations 4/ fi 6s6p, 4/ 5 5d6s 2

, 4/5 5d2 6s?, 4/ ,; 5d6p?

Albertson gave the levels of the 4/ 6 6s2 7 F ground term in his important 1935 paper, which

included 175 levels. The analysis was extended somewhat in his 1937 article and again in the

1949 paper by Brix. Racah and Ganiel gave a theoretical interpretation for 70 of the

4/

b ('F)6s6p levels. Carlier, Blaise, and Schweighofer [1968], Blaise, Morillon, Schweighofer, and Verges

[1969], and Henny-Schweighofer [1970] have revised and extended the analysis to include 65 even levels and about 400 odd levels. The levels and g values are taken from this work at Orsay, with the exception of the g values for the ground-term levels. Blaise [1976] has supplied

a few additions and revisions.

The five-place g values for the 4/ fi 6s 2 7 F levels are weighted averages of atomic-beam

magnetic-resonance measurements by Pichanick and Woodgate [1961] and Childs and Goodman

[1972], as given by the latter authors. The uncertainty is three or four units in the last place.

The leading percentages for these levels are from Conway and Wybourne [1963]. (Childs and

Goodman list detailed eigenvectors from Conway’s refinement of this calculation.) The next

lowest predicted term of 4/ b 6s 2

, the lowest of the three 7 D terms, is expected to begin above

14000 cm 1 (see Sm hi 4/ 6

). None of the higher 4/ h 6s 2 terms has been identified, nor have any

terms (of other configurations) based on higher 4/ fi terms been identified. The level compositions for 4/ fi ( 7 F)5d6s and 4/ 6

( 7 F)6s7s are from Carlier’s thesis [1967],

and the compositions for (4/

5

(

fi H°,6 F°)5d6s 2 +4/ 6

( 7 F)6s6p) were calculated by Carlier et al. Sugar transposed the eigenvectors from the latter calculation by recoupling to the

/

h

( 7 F)sp( :i P°,'P0

) scheme given here. Designations assigned by Blaise et al. to levels that have

not been calculated are listed with question marks, pending a more complete theoretical

interpretation of this spectrum. Most of these tentative designations are for odd levels thought

to belong to the (4/

fi 5d6p+4/ 5 5d2 6s) group. A few unpublished designations or revisions for

the odd levels are included here [Blaise, 1976].

Albertson’s analysis was based on the extensive furnace spectrum data of A. S. King

[1935], which includes wavelengths and temperature classifications for about 2800 Sm I lines in the range of 2910-8718 A, and on the absorption lines measured by Paul (1500 lines, 2503-8301

A). Henny-Schweighofer’s thesis gives more than 5000 Sm I and Sm n lines between 2628 and

9789 A, about three-fourths of them being classified. Zeeman data or the g and J values

derived from such data are listed for the lines. Isotope shift measurements are also given in this thesis, and in several other references listed below. Blaise et al. list 1812 lines for the

spectrum of an electrodeless lamp between 8186 and 24558 A, with 859 of the lines being

classified by transitions in Sm I and Sm II. Morillon [1970] used a grid spectrometer to extend

the infrared observations, obtaining 370 Sm lines (electrodeless lamp source) between 23820

and 41061 A. Parr and Inghram [1975] observed photoionization spectra of samarium vapor at different

temperatures. Their paper gives the positions of 43 resonances (42650-51070 cm' 1 ) due to autoionizing levels observed at a source temperature of 1270 K. A number of low levels were
Sm I —Continued 163

significantly populated at the source temperatures, and no definite analyses of the spectra were possible. We give three tentative odd levels above the limit, based on the authors’

statement that the first three lines they list are probably due to transitions from the

4/ 6 6s 2 7 F 5 level. (The high levels are followed by the letter “a” for autoionization.) Several of

the other resonances have wavenumbers corresponding to a transition from a low level to one

of these three tentative autoionizing levels. The authors discuss the probable configurations of

the autoionizing levels involved in the stronger resonances. Worden, Conway, Paisner, and Solarz [1977] have observed high members of a series in Sm i by using laser techniques. These data became available too late for inclusion here, but the

quoted ionization energy was determined by Worden et al. from the new series.

References

Albertson, W„ Phys. Rev. 47, 370 (1935); 52, 644 (1937). EL CL IP

Blaise, J., unpublished material (1976). EL ND ZE

Blaise, J., Morillon, C., Schweighofer, M. G., and Verges, J., Spectrochim. Acta, Part B 24, 405 (1969). EL CL W ZE

Brix, P., Z. Phys. 126, 431 (1949). EL CL IS

Carlier, A., Thesis (Third Cycle), Univ. Paris, Orsay, 128 pp. (1967). EL PT

Carlier, A., Blaise, J., and Schweighofer, M. G., J. Phys. (Paris) 29, 729 (1968). EL ZE PT

Childs, W. J., and Goodman, L. S., Phys. Rev. A 6, 2011 (1972). ZE Hfs PT

Conway, J. G., and Wybourne, B. G., Phys. Rev. 130, 2325 (1963). PT

Handrich, E., Steudel, A., Wallenstein, R., and Walther, H., J. Phys. (Paris), Colloq. Cl 30, 18 (1969). Hfs

Hansen, J. E., Steudel, A., and Walther, H., Z. Phys. 203, 296 (1967). IS

Heilig, K., Sauthoff, G., and Steudel, A., Z. Phys. 196, 39 (1966). ZE

Henny-Schweighofer, M. G, Thesis (Third Cycle), Univ. Paris, Orsay, 174 pp. (1970). EL CL W ZE IS

Kiess, C. C., Sci. Papers Bur. Stand. (U.S.) 18, 201 (1922). W

King, A. S., Astrophys. J. 82, 140 (1935). W

King, W. H., J. Opt. Soc. Am. 53, 638 (1963). IS

Martin, N. J., Sandars, P. G. H., and Woodgate, G. K., Proc. R. Soc. London, Ser. A 305, 139 (1968). SE Hfs

Morillon, C., Spectrochim. Acta, Part B 25, 513 (1970). CL W

Murakawa, K., Phys. Rev. 93, 1232 (1954). Hfs

Parr, A. C., and Inghram, M. G., J. Opt. Soc. Am. 65, 613 (1975). EL CL W

Paul, F. W., Phys. Rev. 49, 156 (1936). W

Pichanick, F. M. J., and Woodgate, G. K., Proc. R. Soc. London, Ser. A 263, 89 (1961). ZE

Racah, G., and Ganiel, U., J. Opt. Soc. Am. 56, 893 (1966). EL PT

Robertson, R. G. H., Waddington, J. C., and Summers-Gill, R. G., Can. J. Phys. 46, 2489 (1968). Hfs

Smith, K. F., and Spalding, I. J., Proc. R. Soc. London, Ser. A 265, 133 (1961). ZE

Striganov, A. R., Katulin, V. A., and Eliseev, V. V., Opt. Spektrosk. 12, 171 (1962). CL IS Sugar, J., unpublished material (1971). PT

Worden, E. F., Conway, J. G., Paisner, J. A., and Solarz, R. W., unpublished material (1977). IP

[July 1976]

Sm I, Even Parity

Configuration Term J

Level (cm -1

) 9 Leading percentages

4/6 6s2 7 F 0 0.00 94 3

5 D1

1 292.58 1.49839 95 2

5 D1

2 811.92 1.49779 97 2

5 D1

3 1489.55 1.49707 98 1 5 D1

4 2273.09 1.49625 98 1 5 F2

5 3125.46 1.49532 98 1 5G1

6 4020.66 1.49417 97 1 5G1

4/6( 7 F)5d ( 8 H)6s 9 H 1 10801.10 -0.98 99 2 11044.90 0.67 98 3 11406.50 1.08 98

4 11877.50 1.25 97 5 12445.35 1.33 97 6 13095.75 1.385 98 7 13814.90 1.410 99 8 14591.70 1.430 99 9 15418.65 1.445 100
164

Sm I, Even Parity—Continued

Configuration Term J

Level (cm" 1 ) 9 Leading percentages

4/6

( 7 F)5d ( 8 D)6s 9 D 2 12313.11 2.56 83 11 ( 7 F)(6P) 7 P

3 12846.64 2.05 86 4 13458.46 1.830 85 5 14202.85 1.715 85 10 ( 7 F) ( 8 F) 9 F

6 15082.94 1.66 89

4/6

( 7 F)5d ( 8 H)6s 7 H 2 13050.05 0.02 88 10 ( 7F) ( 6H) 7 H

3 13542.80 0.77 86 11 ( 7 F) ( 6 H) 7 H

4 14154.30 1.075 82 11 ( 7 F) ( 6H) 7 H

5 14856.20 1.240 76 12 ( 7 F) ( 6 H) 7 H

6 15617.45 1.36 65 14 ( 7F) ( 8G) 9G

7 16392.93 1.430 53 26 ( 7 F) ( 8G) 9G

8 17270.96 1.435 50 34 ( 7 F) ( 8G) 9G

4/6

( 7 F)5d ( 8 F)6s 1 13369.35 2.65 38 9F 31 ( 7F) ( 8G) 9G

4/6( 7 F)5d ( 8 G)6s 9G 0 13551.20 96 2 13687.75 1.780 54 35 ( 7 F) ( 8 F) 9F

1 13732.53 2.01 59 20 ( 7F) ( 6 P) 5 P

3 14056.70 1.63 54 31 ( 7 F) ( 8 F) 9 F

4 14563.98 1.575 57 29 ( 7 F) ( 8 F) 9 F

5 57 26 ( 7 F) ( 8 F) 9F

6 51 25 ( 7F) ( 8 F) 9F

7 39 29 ( 7 F) ( 8 H) 7 H

8 65 32 ( 7 F) ( 8 H) 7 H

4/6

( 7 F)5d ( 8 F)6s 9 F 1 14026.45 2.92 52 31 ( 7F) ( 6P) 5P

2 14365.50 1.845 43 42 ( 7 F) ( 8G) 9G

3 14920.45 1.74 55 31 ( 7F) ( 8G) 9G

4 43 33 ( 7 F) ( 8G) 9G

5 60 33 ( 7 F) ( 8G) 9G

6 63 32 ( 7F) ( 8 G) 9G

7 64 34 ( 7 F) ( 8G) 9G

4/6

( 7 F)5d ( 6 P)6s 7P 2 14550.50 2.340 56 14 ( 7F) ( 8 P) 7 P

4/6

( 7 F)5d ( 8 P)6s 9P 3 14612.44 2.14 48 25 ( 7 F)5d ( 6P)6s 7 P

4 43 16 ( 7 F)5d ( 6P)6s 7P

5 57 25 ( 7 F)5d ( 8D)6s 7 D

4/6( 7 F)5d ( 8 D)6s 7 D 2 14783.51 1.93 43 27 ( 7F) (6P) 5P

3 15524.56 1.84 53 20 ( 7 F) ( 8 P) 9P

1 56 31 ( 7 F) ( 6 P) 5P

4 16354.60 1.640 53 24 ( 7 F) ( 8 P) 9P

5 43 37 ( 7 F) ( 8 P) 9 P

4/6( 7 F)5d ( 8G)6s 7 G 1 15639.80 0.18 58 22 ( 7 F) ( 8 F) 7 F

2 15955.24 1.085 52 16 ( 7 F) ( 8 F) 7 F

3 54 15 ( 7 F) ( 8 F) 7 F

4 48 16 ( 7 F) ( 8 F) 7 F

5 44 17 ( 7 F) ( e H) S H

6 44 28 ( 7 F) ( e H) 5 H

7 40 37 ( 7 F) ( 6 H) 5 H

4/6( 7 F)5d ( 8 F)6s 7 F 0 15793.68 74 12 ( 7 F) ( 8 F)5 D

4/6( 7 F)5d ( 6 P)6s 3 15834.60 1.815 27 7 P 21 ( 7 F) ( 8 P) 9P

4/6( 7 F)5d ( s H)6s 7 H 2 18176.17 0.02 87 10 ( 7F) ( 8 H) 7 H

4/6( 7 F)6s ( 8 F)7s 9 F 1 28708.20 3.36 95 2 29037.25 1.85 90 3 29551.86 1.80 89 4 30191.24 1.68 90 5 30921.99 1.53 93 6 31725.70 1.59 96

7 32567.76 1.57 100
165

Sm I, Even Parity—Continued

Configuration Term J

Level (cm -1

) g Leading percentages

4/6 6s2 ? 2 29066.02 1.57

4/6( 7 F)6s ( 8 F)7s 7 F 0 29469.59 88 12 ( 7F) ( 6 F) 7 F

1 29656.26 1.48 74 12 2 30148.40 1.67 67 13 3 30755.28 1.47 66 14 4 31508.12 1.515 69 15 5 32333.00 1.515 73 16 6 33202.66 1.49 78 18

4/6 6s2 ? 2 30040.95 1.79

4/6 6s2 ? 5 30931.62 1.48

4/6

( 7 F)6s ( 6 F)7s 5 F 2 31246.30 1.21 63 24 ( 7 F)6s ( 8 F)7s 7 F

Sm II ( S F„2 ) Limit 45519

"

Sm I, Odd Parity

Configuration Term J

Level (cm -1

) 9 Leading percentages

4/6( 7 F)6s6p(3P°) 9G

° 0 13796.36 94 5 ( 7F)(ip°) 7 F

°

1 13999.50 1.50 95 4 ( 7F)( 1 P°) 7 F°

2 11,380.50 1.50 95 4 ( 7 F)( 1 P°) 7 F°

3 11,915.83 1.49 94 3 CFIFP0

) 7 F°

4 15579.12 1.500 94 3 ( 7 F)( 1 P°) 7 F°

5 163U-77 1.505 94 2 ( 7 F)( 1 P°) 7 F°

6 17193.73 1.50 96 1 ( 7 F)( 1 P°) 7 F°

7 18118.86 1.49 98 1 ( 7 F)(3P°) 7G°

8 19138.80 1.50 100

4/6( 7 F)6s6p(3P°) 9 F° 1 11^63.85 3.10 57 37 ( 7 F)(ip°) 7 D

°

3 16211.12 1.76 55 28 ( 7 F)(3P°) 9 D°

4 16890.59 1.605 67 18 CFJOP0) 7G

° 5 17587.1,6 1.545 68 26 ( 7 F)(ip°) t G

°

6 18298.30 1.52 62 30 CDOP0) 7 G°

7 19005.65 1.51 60 37 ( 7 F)( 1 P°) 7 G°

4/6

( 7 F)6s6p(3 P°) 2 15039.59 2.365 41 9D° 29 ( 7F)( 1 P°) 7 D°

4/6

( 7 F)6s6p(3 P°) 9 D° 3 15507.35 1.965 57 24 ( 7F)(ip°) 7 D

°

2 15567.32 2.235 53 36 ( 7 F)(3 P°) 9 F°

4 16131.53 1.79 70 18 ( 7 F)(ip°) 7 G°

5 16859.31 1.705 81 10 ( 7F)(ip°) 7 D

°

6 1 7651,-51, 1.650 88 6 CF)^0

) 7 F

°

4/6( 7 F)6s6p(3 P°) 5 D

° 0 15586.30 74 22 ( 7 F)(ip°) 7 F

°

4/6( 7 F)6s6p( 1 P°)

0 O 1 15650.55 -0.13 79 10 ( 7 F)(3P°) 5 F°

2 1611642 0.960 80 9 ( 7 F)(3P°) 5F°

3 1671,8.30 1.27 78 11 ( 7 F)(3 P°) 9F°

4 1 7501,-63 1.395 75 18 ( 7 F)(3 P°) 9 F°

5 1835040 1.44 71 26 ( 7 F)(3P°) 9 F°

6 19251,29 1.47 65 34 ( 7 F)(3P°) 9F°

7 20211.95 1.475 60 39 ( 7 F)(3P°) 9F°

4/6( 7 F)6s6p(3 P°) 5 D° 1 16112.33 1.50 59 16 ( 7 F)( 1 P°) 7 F°

4/6

( 7 F)6s6p(3 P°) 2 16681.71, 1.77: 42 5 D° 22 ( 7 F)( 3 P°) 9 F°
166

Sm i, Odd Parity—Continued

Configuration Term J

Level (cm 1 ) 9 Leading percentages

4/6

( 7 F)6s6p( 1 P°) 7 D° 1 16690.76 2.83: 53 30 ( 7 F)(3 P°) 9 F°

4/6

( 7 F)6s6p(>P°) 7 p° 2 1719020 1.425 46 25 ( 7 F)( 1 P°) 7 D°

0 17810.85 65 20 ( 7 F)(3 P°) 5 D°

3 17830.80 1.215 41 37 ( 7 F)(3P°) 5G°

4 19191.64 1.27: 60 20 ( 7 F)(3P°) 5G°

5 2015347 1.44 68 19 ( 7 F)(3P°) SG°

6 21055.76 1.455 65 26 ( 7 F)(3P°) 5G°

4/6

( 7 F)6s6p( 1 P°) 3 1 721,3.55 1.62 35 7 D° 21 ( 7 F)(3 P°) 5 D°

4/6

( 7 F)6s6p(3 P°) 5G

° 2 171,62.37 0.755 74 8 ( 7 F)(3 P°) S F°

3 18209.01, 1.39 36 27 ( 7 F)( l P°) 7 F°

4 18503.1,9 1.365 41 27 (7 F)(1 P°) 7 D°

5 18811.11 1.45 47 17 (’FXip0

) 7 F

° 6 1971241 1.38 70 23 ( 7 F)(ip°) 7 F

°

4/6

( 7 F)6s6p('P°) 1 17769.71 0.80: 26 7 F

° 17 ( 7 F)(3P°) 5F°

4/6

( 7 F)6s6p( 1 P°) 4 1795927 1.52 30 7D° 21 ( 7 F)(3P°) 5G°

4/5

( 6 H°)5d6s2 7 H° 2 18075.67 0.41 56 11 4/s( 7 F)6s6p( 1 P°) 7 F°

3 1891,8.78 0.94 45 11 4/6

( 7 F)6s6p(3P°) 5 D°

4 1999025 1.115 53 10 ( 6 H°) 7 I° 5 21062.82 1.21 59 12 ( 6 H°) 7 G°

6 22160.81, 1.305 52 15 ( 6H°) 7G°

7 2333740 1.36 53 13 ( 6H°) 7G°

8 74 14 (6F°) 7 H°

4/6

( 7 F)6s6p( 1 P°) 1 18225.13 0.695 31 7 F

° 21 4/5

( G H°)5d6s2 7G°

4/5( e H°)5d6s2 7p° 0 18309.02 74 13 4/6

( 7 F)6s6p(3P°) 7 F°

1 18U7528 0.96 65 13 4/6

( 7 F)6s6p(3P°) 5 F°

2 18788.08 1.280 31 14 4/6

( 7 F)6s6p( 1 P°) 7 F°

3 1950127 1.365 49 8 4/G

( 7 F)6s6p(3 P°) 5 D°

4 20163.00 1.390 30 14 4/6

( 7 F)6s6p(3 P°) 5 F°

5 21458.89 1.425 42 18 ( 6 H°) 7G°

6 22944-38 1.475 61 23 4/6

( 7 F)6s6p(3P°) 7 F°

4/5

( 6 H°)5d6s2 7 I° 3 18328.64 0.33 88 7 ( 6H°) 7 H°

4 19174.84 0.96: 86 9 ( 6 H°) 7 H°

5 20183.35 1.03 84 11 ( 6H°) 7 H°

6 21296.45 1.12 82 12 ( 6H°) 7 H°

7 22468.87 1.235 82 12 ( 6 H°) 7 H°

8 83 8 ( 6 H°) 7 H°

9 89 11 ( 6H°) 7 K°

4/5( 6 H°)5d6s2 2 18416.62 1.08 15 7 H° 13 ( 6 H°) 7 F°

4/6( 7 F)6s6p(3 P°) 5 F° 1 18985.70 0.18 58 16 4/5

( G H°)5<26s2 7G°

2 19677.46 1.08 59 14 ( 7F)(3 P°) 5 D°

3 20459.30 1.295 55 26 ( 7F)(3 P°) 5 D°

5 21809.74 1.41 56 14 4/5

( G H°)5d6s2 7 F°

4/5( 6 H°)5d6s2 2 19009.52 0.945 37 7G° 28 ( 6 H°) 7 F°

4/5( 6 H°)5rf6s2 3 19210.09 1.27 22 7 H° 16 ( 6 H°) 7 F°

4/e( 7 F)6s6p( 1 P°) 7 D° 5 19264.63 1.485 64 23 ( 7 F)(3 P°) 5G°

4/5

( G H°)5d6s2 7 G° 3 19776.97 1.15 52 22 4/6

( 7 F)6s6p(3 P°) 7 G°

4/5

( G H°)5d6s2 5 F° 1 20091.03 0.09 55 12 (6H°) 7G°

2 20762.82 0.99 53 11 4/6

( 7 F)6s6p(3P°) 7 G°

3 21 700.89 1.235 46 15 ( 6H°) 7G°

4 22893.05 1.345 32 20 (6H°) sG

°

5 28 20 ( 6H°) 5 I°
167

Sm i, Odd Parity—Continued

Configuration Term

1 J

Level (cm" 1

) 9 Leading percentages

4/s

( 6 H°)5d6s2 4 20396.67 1.405 24 7 F

° 14 4/6

( 7 F)6s6p(3 P°) 5 F°

6 20593.06 1.23

4/5

( 6 H°)5d6s2 4 20712.83 1.29 37 7G° 22 4/e

( 7 F)6s6p(3P°) 7 G°

4/6

( 7 F)6s6p(3 P°) 7 D° 1 21193.68 2.93 87 8 4/5

( 6 F°)5d6s2 7 D°

2 21813222 1.94 85 8 4/5

( 6F°)5d6s2 7 D°

3 22632.30 1.69 81 8 4/5

( 6F°)5d6s2 7D°

4 2359A-8A 1.60 67 10 4/5

( 6 H°)5d6s2 5G°

5 21,323.51 1.46 35 20 ( 7 F)(3P°) 7 F°

4/6

( 7 F)6s6p(3 P°) 4 212A3.30 1.385 45 5D° 44 ( 7 F)(3P°) 5 F°

4/6

( 7 F)6s6p(3P°) 5 21 599.8

1.37 23 5p° 18 4/5

( s H°)5d6s2 7G°

4/6( 7 F)6s6p(3P°) 7 F° 0 2201,1.02 58 32 4/5(®H°)5d6s2 7 F°

4/6

( 7 F)6s6p(3P°) 7 p° 1 22313.63 1.480 53 31 4/5

( 6 H°)5d6s2 7 F°

4/5

( 6 H°)5d6s2 5G° 2 22A91.9A 0.52 65 16 4/6

( 7 F)6s6p(3P°) 7 G°

4/5

( 6 H°)5d6s2 6 226A3.12 1.355 32 7G° 19 ( 6 H°) 7 H°

4/5

( 6 H°)5d2 6s? 9 I°? 2 228AA-00 0.49: 3 23230.75 0.83 4 23802.10 0.975

5 2AA67.8A 1.15 6 25259.80 1.25 7 261 71120 1.275 8 27196.73 1.35 9 28305.00 1.38 10 29A67.69 1.395

4/6

( 7 F)6s6p(3P°) 2 22893.37 0.59: 44 7 F° 29 4/5

( 6 H°)5d6s2 7 F°

4/6

( 7 F)6s6p(3P°) 7G° 1 2291 A.O 7 -0.480 57 21 4/5

( 6 F°)5d6s2 7G°

4/5( 6F°)5d6s2 7 G° 1 232A3.8A -0.475 67 22 ( 6H°) 7G°

4/5( 6 H°)5d6s2 3 23316.63 1.01 37 5G° 30 4/6

( 7 F)6s6p(3 P°) 7 G°

4/5

( 6 F°)5d6s2 7 G° 2 23380.75 0.72 52 28 4/6

( 7 F)6s6p(3P°) 7G°

4/5

( 6 F°)5d6s2 2 235A6.5A 0.795 30 7 H° 25 ( 6H°) 7G°

9 H°? 1 23629.98 -0.80

4/6

( 7 F)6s6p(3 P°) 3 23709.98 1.260 32 ?F° 26 4/5

( 6 F°)5d6s2 7 F°

4/6

( 7 F)6s6p(3 P°) 7 2373A-36 1.37 38 7G° 31 4/5

( 6H°)5d6s2 7G°

9 H°? 2 238A7125 0.60 4/5

( 6F°)5d6s2 7 G° 3 23852.A3 0.95 52 22 (6F

0

) 7 H

°

4/5

( 6 F°)5d6s2 7 H° 2 23986.A8 0.32 52 16 ( 6F°) 7 G°

3 2A150.80 1.105 37 15 (6H°) 7G

° 4 25065.37 1.21 52 24 ( 6F°) 7 G°

5 26065.85 1.245 43 17 ( 6F°) 7G°

6 27129.A9 1.33 50 18 ( 6F°) 7 G°

7 27718.35 1.345 45 33 ( 6F°) 7 G°

8 80 12 ( 6F°) 7 H°

4/e

( 7 F)6s6p(3P°) 4 23996.55 1.045 35 7G° 14 4/5

( 6 H°)5d6s2 5G°

7 D°? 1 2A18A-05 2.21

9 H°? 3 2A2AA.80 1.08 4 2A312.02 1.09

1 2A375.60 2.49 4/5

(6 F°)5d6s2 3 2AA67127 0.965 26 7 H° 22 ( 6F°) 7G°
168

Sm I, Odd Parity—Continued

Configuration Term J

Level (cm' 1 ) 9 Leading percentages

7 D°? 2 21*1*98.96 1.73 4 21*570.03 1.04 4/s

( 6 F°)5d6s2 4 21*633.75 1.325 20 7p° 19 ( 6 F°) 7G°

4/6( 7 F)6s6p(3 P°) 5 21*668.79 1.53 32 7 D° 17 ( 7 F)(3 P°) 7 G°

4/5

( 6 F°)5d6s2 4 21*772.71* 1.25 27 7G° 23 (6 F°) 7jp

2 21*91328 1.770

7 D°? 3 21*967.11* 1.56

5 21*977.83 1.20 4/5

( 6 H°)5d6s2 4 25387.1

7

1.055 26 sp 18 ( 6 H°) 5G°

4/5( 6 F°)5d6s2 5 25390.91 1.29 25 7H° 24 (6F°) 7 G°

5 251*53.11 1.32

7 D°? 4 25572.10 1.40 3 25601*.76 1.645 4/5

( 6 H°)5d6s2 5 25615.55 1.39 15 7G° 14 ( 6 H°) 5 F°

4 25663.60 0.705 4/5

( s H°)5d6s2 5 25675.50 1.12 38 5 p 25 ( 6F°) 7G°

4/6( 7 F)5d6p(3 F°)? 9|°? 2 25808.90 -0.22

3 2621J*.75 0.55 4 2675226 0.94 5 27852.78 1.16 6 28861*.89 1.25 7 2991*8.38 1.325 8 31129.79 1.360 9 32129.89 1.43 10 3380829 1.42

4/6( 7 F)6s6p(3 P°) 6 2581*0.31 1.48 40 7G° 17 4/5

( 6 H°)5d6s2 7G°

4/5

( 6 F°)5d6s2 7 P° 2 25979.30 2.535 95 2 ( 6F°) 5p°

2 26051*.05 2.34

1 2611*6.01

6 26180.92 1.29

7 H°? 2 26220.86 0.09

7 I°? 3 26267.11* 0.39

4/5

( 6 F°)5d6s2 7 F° 0 59 25 4/6

( 7 F)6s6p(3P°) 7 F°

1 26281.09 1.50 58 25 2 26786.80 1.34: 58 25 3 27125.50 1.49 59 24 4 28180.95 1.50 58 24 5 29023.96 1.405 54 23 6 30092.53 1.455 49 20

7 D°? 5 26311.1*5 1.50

4 2638225 1.57

9 H°? 1 261*3825 -0.81 4/5

( 6 F°)5d6s2 6 261*71.33 1.355 28 7 H° 25 ( 6F°) 7 G°

5 26507.31 0.935

3 26619.16 1.935

-

4 26657.10 0.91

3 26703.85 1.900
169

Sm i. Odd Parity—Continued

Configuration Term J

Level (cm -1

) 9 Leading percentages

7 H°? 3 2671440 0.725

9H°? 2 26721.35 0.785

5 26776.98 1.190

1 26803.70 1.17: 0 26822.13

4/5( 6 F°)5d6s2 7 D° 1 26962.12 2.565 82 8 4/6

( 7 F)6s6p(3P°) 7 D°

2 27671.35 1.955 84 8 4/6

( 7 F)6s6p(3P°) 7 D°

3 28356722 1.59 74 8 4/6

( 7 F)6s6p(3P°) 7 D°

4 29365.03 1.60 51 14 ( 6F°) 7p° 5 30233.64 1.55 68 8 ( 6F°) s F

°

4 26962.12 0.85

9 H°? 3 27166.50 1.02 -

5 27255.97 1.55

7 27263.07 1.40

1 27267.94 0.475 4/6

( 7 F)6s6p(3 P°) 7 G° 7 27287.58 1.400 47 24 4/5

( 6 H°)5d6s2 7G°

7 H°? 2 27338.00 0.07 2 27398.92 1.675

7 H°? 4 27406.90 1.00

6 27509.09 1.080

9H°? 1 2754828 -0.86

4 27583.38 1.765 2 2762725 1.525

7 I°? 5 27654.90 1.03

9H°? 2 27709.40 0.575

4 27734-99 1.685 6 27782.41 1.230

9 H°? 4 27783.54 1.20 7 27790.77 1.26

7 H°? 3 27818.55 0.725

7 D°? 1 27888.93 2.84 2 27920.10 0.40

0 27925.31

3 27992.35 0.805

2 28065.45 1.49 4/5

( 6 F°)5e£6s2 7 28138.00 1.39 38 7G° 23 (6F°) 7 H

°

3 28164.78 1,14 0 2816822

3 28224.05 0.86

1 28233.08 1.74:

7 28250.02 1.46 5 28331.84 1.135

7 D°? 2 28359.00 1.785

9H°? 8 28373.05 1.425

225-298 0 -78-12
170

Sm I, Odd Parity—Continued

Configuration Term J

Level (cm -1

) g Leading percentages

4 28W1.00 1.42

7 H°? 4 28425.30 1.01

2 28445.02 1.54

4 28465.30 1.140 2 28496.57 1.53 3 28505.72 1.56

9H°? 5 28534-04 1.300 3 28585.07 0.935

7 I°? 6 28600.02 1.165

7 D°? 1 2861322 2.125: 5 28694-06 1.67

1 2870425 1.725: 4 28705.58 1.53

3 28744.99 1.425 4 28752.34 0.96

4 2885325 1.19 3 28855.76 1.37

1 28913.97 0.27

3 28942.00 1.02

3 28998.13 1.48

2 29041.31 1.36

5 29069.90 1.33

1 29130.03 0.495

7 H°? 5 29151.15 1.23 4 2915226 1.45 2 29156.00 1.79 2 29200.62 1.33 4 29210.73 1.13 3 29226.71 1.68 3 2928228 2.00 4/5

( 6H°)5d6s2 6 29379.80 1.215 42 5 H° 19 ( 6 F°) 5 H°

5 29475.54 1.26

2 29478.74 2.06 4 2948125 1.10 5 29490.40 1.20 2 29506.40 1.11

*

4 29521.75 1.36 4 29557.87 0.93

9 H°? 9 2956424 1.435

5 29602.09 1.20

7 I°? 7 29627.02 1.25 2 29639.45 0.305 3 29648.85 1.230 4 2965120 1.20
171

Sm I, Odd Parity—Continued

Configuration Term J

Level (cm -1

) 9 Leading percentages

4/5

( 6 F°)5d6s2 5 G° 4 29673.01 1.26 54 18 ( 6F°) 7 D°

2 29723.05 0.44

4 29731.OQ 1.64

8 29741.50 1.24 6 29746.53 1.34 3 29775.10 1.83

6 2980332 1.575

5 29807.75 1.415

1 2981 7.84 1.21

4 29855.91 1.815 6 29929.38 1.30

1 30069.97 1.68 5 3008937 1.35

1 30107.05 1.56

3 30125.74 1.565 2 30128.88 1.38

7G° 1 30238.46 -0.14

3 30251.58 0.93 6 30256.40 0.96

7 30278.08 1.01

5 30284-40 1.33

6 3031237 1.215 3 30321.75 1.37

4/5( 6 H°)5d6s2 5 H° 7 30330.78 1.275 47 28 ( eF°) 5 H°

5 30332.35 1.33

4 30337.45 1.35

2 30399.70 1.96

1 30412.50 1.27 5 30416.80 1.58

2 30435.00 0.84

3 30476.37 0.685 2 30537.33 1.42

3 30559.13 0.585

6 30560.04 1.45

5 30560.08 1.48

7 30569.18 1.37

6 30586.50 1.17

2 30596720 1.57

7 D°? 4 30619.60 1.64

5 3063321 1.36

6 30659.34 1.40

5 30689.95 1.335

7 I°? 8 30698.42 1.29

3 30753.65 1.49
172

Sm I, Odd Parity—Continued Sm I, Odd Parity—Continued

Configuration Term J

Level

(cirr 1

) 9 Configuration Term J

Level (cm -1

) 9

1 30753.72 1.32 2 31786.71+ 1.25

7 30770.00 1.37 3 31820.91 1.25

4 30775.70 0.68 6 3181+5.65 1.33:

3 30788.75 0.75 6 31865.83 1.42:

2 3079627 1.32 3 31893.78 1.34

2 30823.5

A

1.72 4 31901+.93 1.55

3 30836.69 1.47 0 31923.80

2 30901.1+0 1.17 5 31921+.70 1.29

1 3091122 1.54 2 31931+.03 1.81

3 30963.07 1.49 7 31960.69 1.495

4 3100920 1.425 5 32028.11 1.475

6 3101520 1.415 1 32086.66 1.42

5 31021+.75 1.41: 4 32125.53 1.17

1 3101+1.00 0.60 4 3211+928 1.565

5 3101+7.10 1.11: 4 32188.17 1.43

2 31062.30 1.43 5 32197.35 1.35

6 31108.1+2 1.545 8 32212-1+5 1.47

4 31156.1+0 1.64 3 3225220 1.47

6 31171+.68 1.29 5 32260.63 1.13

3 3118520 1.50 6 32281+. 1+9 1.46

7 3120722 1.435 4 32289.85 1.22

5 31210.33 1.27 2 32291+20 1.73

1 31219.70 2.66 5 3231+0.69 1.41

4 31231+.62 1.21 4 3231+621+ 1.66

4 31322.81+ 1.29 2 321+01.65 1.58

3 3131+2.95 1.57 1 321+02.62 1.93 3 31352.05 1.50 2 32558.70 1.76 4 31361+.15 1.20 5 32626.35 1.36

1 31391.80 0.19 6 32696.63 1.34

4 311+21.00 1.32 5 32735.62 1.26

2 311+39.15 0.765 3 32822.82 1.50

3 311+83.52 1.43 5 32831.50 1.355

4 311+93.1+1 1.16 1 32865.57 0.84

1 31503.1+5 1.12 5 32868.71 1.42

6 31503.83 1.42 3 32907.61+ 1.49

8 31531+.12 1.40 1 33030.91 0.00

5 31568.1+0 1.04 6 33081.1+5 1.28

1 31581+.91 2.77 2 33199.1+0 1.96

3 31597.53 1.73 8 33318.35 1.345

4 31665.1+3 1.52 4 33329.35 1.37

9H°? 8 3169920 1.400 2 33382.06 0.90

2 31716.1+1 1.950 6 33381+.92 1.35

7 I°? 9 3171+6.67 1.35 7 331+08.80 1.32

5 31751+23 1.38 4 33All.09 1.52
173

Sm I, Odd Parity—'Continued Sm I, Odd Parity—Continued

Configuration Term J

Level (cm -1

) 9 Configuration Term J

Level (cm -1

) 9

4 33438.94 1.600 4 34514.74 1.45

7 3350728 1.350 6 34723.16 1.35

2 33634.82 2.22 8 34761.78 1.430 3 33733.00 1.505 9H°? 9 351 76.51 1.43

7 33739.36 1.460

3 33838.15 1.35 Sm n ( 8 Fi/ 2 ) Limit 45519

4 33983.40 1.48

2 34044-11 2.03 4? 45775a"!

3 34189.36 1.88 4,5,6 45865a"!

5 34224.44 4,5,6 46015a"!
174

Sm II

(Pm i sequence; 61 electrons) Z=62

Ground state (ls 2 2s 2 2pfi 3s 2 3pR 3d l "4s 2 4p6 4d 10 5s 2 5p‘; ) 4/ R 6s 8 F 1/2

Ionization energy 89300± 600 cm 1 11 . 07 ± 0.08 eV

Identified even configurations 4/ R 6s, 4/ R 5c(

Identified odd configurations 4/ 7

, 4/ fi 6p?, 4/ r, 5d6s?

Albertson’s analysis of this spectrum yielded about 40 low even levels, which he assigned

to terms of the 4/ R ('F)6s and 4/ 6

( 7 F)5c? subconfigurations, and more than 200 upper odd levels. The group at the Laboratoire Aime Cotton, Orsay, has revised and extended the analysis to include 70 even levels and more than 300 upper odd levels. We have taken the levels and g

values from their work as given in the article by Blaise, Morillon, Schweighofer, and Verges

[1969] and in the theses of Carlier [1967] and Henny-Schweighofer [1970], Carlier’s calculation

of the (4/

6

(

7 F)6s+4/ R

( 7 F)5d) configurations is the source of the percentage compositions.

Blaise et al. found the 4/ 7 8 S°/2 term, which is the lowest known odd level. Most of the odd

levels are expected to belong to the group of four configurations (4/

R 6p+4/ 3 (5d+6s) 2

); a calculation including these configurations and their interactions is needed. Although singleconfiguration assignments will no doubt be meaningless for some of these levels, the tentative

assignments listed here may prove useful in correlating experimental and calculated levels. Albertson made most of the tentative assignments to 4/ R

(

7 F)6p. Blaise [1976] has furnished

additional tentative assignments, mostly to 4/ 5 5d6s, and has revised some of Albertson’s

designations. A few odd levels having low J values and distinctive g values were assigned

octet designations by Blaise et al. (Six 8 F°/2 and five 8 G°/2 levels, for example, are known.)

The ionization potential is from Sugar and Reader.

The various observations of Sm spectra mentioned in the preceding text for Sm i included

measurements of Sm n, and the description of these lists need not be repeated. King’s 1935

list, which gives almost 1800 lines of Sm n, was extended somewhat for Sm n by King and

Albertson, and was also supplemented by Zeeman data [Albertson, 1936]. Albertson’s list of

about 1200 classified Sm ii lines has been extended by Henny-Schweighofer [1967], Blaise et

al. [1969], and Morillon [1970], In his 1936 paper Albertson also gave a noteworthy description of rare-earth spectra in general. He divided these into classes by character and noted that the order in which they were being analyzed corresponded to an increasing complexity. Using the different characters

of the spectra and the known ground configurations for La I, Sm I, Eu I, Gd I, and Yb I, Albertson gave a table of ground configurations for all the neutral rare earths that has proved

correct except for two elements.

References

Albertson, W., Astrophys. J. 84, 26 (1936). EL CL W ZE IP

Albertson, W., and King, A. S., Phys. Rev. 49, 209 (1936). ZE

Becher, J., Thesis, Johns Hopkins Univ., Baltimore, 135 pp. (1965); (Univ. Microfilms, Ann Arbor, Mich., No. 66-4956). PT

Blaise, J., private communication (1976). ND

Blaise, J., Morillon, C., Schweighofer, M. G., and Verges, J., Spectrochim. Acta, Part B 24, 405 (1969). EL CL W ZE

Carlier, A., Thesis (Third Cycle), Univ. Paris, Orsay, 128 pp. (1967). EL ND PT

Henny-Schweighofer, M. G., Thesis (Third Cycle), Univ. Paris, Orsay, 174 pp. (1970). EL CL W ZE IS

Kiess, C. C., Sci. Papers Bur. Stand. (U.S.) 18, 201 (1922). W

King, A. S., Astrophys. J. 82, 140 (1935). W

Morillon, C., Spectrochim. Acta, Part B 25, 513 (1970). CL W

Sugar, J., and Reader, J., J. Opt. Soc. Am. 55, 1286 (1965). IP

[July 1976]
175

Sm ii, Even Parity

Configuration Term

J

Level (cm^ 1 ) 9 Leading percentages

4/«(7 F)6s 8 F

V2 0.00 3.950 99 3/ 

326.64 1.975 98 51 2 838.22 1.708 97 7 / 2 1489.16 1.610 97 9

/2 2237.97 1.580 98

11/2 3052.65 1.550 99

13/2 3909.62 1.540 99

4/6( 7 F)6s 6 FV2 1518.29 -0.595 99 3i 2 2003.23 1.085 98 5/2 2688.69 1.325 97 7 / 

3499.12 1.400 97 9

/2 4386.03 1.440 97

ll / 

5317.56 1.455 98

4/6( 7 F)5d 8 H 3

/2 7135.06 -0.385 99 5/2 7524.86 0.70 99 7 / 

8046.00 1.055 99 9/ 

8679.23 1.210 99 H/2 9406.63 1.300 99

13/2 10214.38 1.35 99

15/2 11094.06 1.38 99

17 /2 12045.10 1.41 100

4/6( 7 F)5d 8 D 3 / 8578.70 2.62 84 13 6p 5 / 

9410.00 2.01 90 7 / 

10180.70 1.790 91 9

/2 10960.16 1.685 92 n/2 11791.05 1.636 95

4/6( 7 F)5d 8G */2 10371.51 0.360 70 28 8F 3 / 

10518.50 1.335 65 31 5

/2 10873.30 1.435 63 31 7 / 

11395.40 1.465 64 29 9/ 

12045.17 1.470 66 28 n/2 12789.81 1.47 69 27

!3/2 13604.50 1.47 72 26

15/ 2 14503.67 1.455 97

4/6 ( 7 F)5d 8 F

V2 10743.40 2.32 69 29 8G 3/ 

11155.30 1.64 61 34 5/ 

11659.80 1.57 38 27 7 / 

12232734 1.532 62 33 9/ 

12841.60 1.52 65 32 n/2 13466.50 1.51 68 29

13/ 2 14084.55 1.514 73 26

4/6( 7 F)5d eP 3/ 

11047.30 2.510 84 12 8 D 5/ 

11798.60 1.99 35 32 sP 7 / 

13777.05 1.78 61 34 8P

4/6( 7 F)5d 8 P 5 / 

12566.80 2.16 51 42 ep 7 / 

12987.86 1.86 63 31 ep 9 / 

14115.00 1.778 96

4/6( 7 F)5d 6 H 5/2 14193.43 0.295 98 7 / 

14667.96 0.840 96 9/ 

15242.95 1.080 96 n/2 15897.54 1.21 96

13 /2 16615.50 1.295 97

l5/2 17391.89 1.34 97
176

Sm II, Even Parity—Continued

Configuration Term J

Level (cm 1 ) 9 Leading percentages

4/6

( 7 F)5rf e F 3

/2 16077.75 1.35 46 26 6D

V2 16162.32 0.300 88 10 6 D

7 /2 17005.30 1.405 43 41 6 D

9/2 17717.86 1.52 46 42 6 D

u/2 18506.80 70 27 6G

4/6( 7 F)5d 6 D 5

/

2

16428.70 1.355 50 38 6F

1 h 17054.60 87 10 e F

3

/2 17568.38 1.58 66 27 6 F

7

/

2

18807.69 1.52 43 35 6G

9

/2 19400.27 48 33 6G

4/6( 7 F)5d 5/2 18050.94 1.54 37 6D 34 6G

4/6( 7 F)5d 6G 3

/

2

18478.13 0.01 71 25 6 F

5

/2 19035.41 59 33 6F

7 /2 19627.90 1.30 54 36 6 F

9

/

2

20179.48 1.35 55 36 6 F

13 /2 20582.56 97

1X /2 20648.02 1.35 70 28 6 F

Sm hi ( 7 Fo) Limit 89300

Sm II, Odd Parity Sm II, Odd Parity

Configuration Term J

Level (cm -1

) 9 Configuration Term J

Level (cm -1

) 9

4r

8 S° 7

/

2

18288.85 2.01 3! 2 2i.19i.38 0.275

4/6( 7 F)6p? 8G° 21250.75 -1.155

l h 2i221.81 2.41

4/5( 6 H°)5d6s? 3h 21507.87 0.19 4/6

( 7 F)6p? 9

/

2

2i257.37 1.445

8 F

° 1 h 21655.172 3.735

7

/

2

2i358.12 0.75

4/6

( 7 F)6p? 3

1 2 21 702.33 0.515 4/6

( 7 F)6p? 3

/

2

2029.52 1.030

4/5( 6 H°)5d6s? 3

1 2 21813.61 0.255 4/6

( 7 F)6p? 5h 2i582.59 1.29

4/e

( 7 F)6p? 3

/

2

2190L12 1.81 4/6

( 7 F)6p? 1X /2 2U588.00 1.39

4/5

(6 H°)5d6s? 5/2 22039.98 0.70

3

12 2i685.53 0.360

4/6

( 7 F)6p? 3

1 2 222U8.32 1.360 4/6

( 7 F)6p? 7

/

2

2i689.8i 1.41

4/6( 7 F)6p? 5

1 2 221t29.1t9 1.30 4/5

( 6 H°)5d6s? ll/2 2i81628 1.36

4/5( 6 H°)5d6s? 7

/

2

22788.68 1.045

3

! 2 2i8i847 1.08

4/6( 7 F)6p? 7

/

2

2287541 1.46

7

/

2

2097.91 0.835

4/6

( 7 F)6p? 3/2 231 7749 0.70 4/5

( 6 H°)5d6s? X /2 2i919.90 -0.85

4/6

( 7 F)6p? 7

/

2

23260.95 1.355 4/6

( 7 F)6p? 5

/

2

2i928.80 1.220

5

1 2 23321 4h 0.37

3

/

2

25055.5i 1.21

1 U 2335241 -0.505

s F

° ‘/

2

25115.55 3.52

4/6

( 7 F)6p? 9

/

2

2361t6.90 1.35

5

/2 25175.32 0.945

23659.99 0.235 4/5

( 6 H°)5d6s? 3

/

2

25178.i5 0.98

4/5

( 6 H°)5d6s? 9

/

2

23752.70 1.32 4/6

( 7 F)6p? 7

/

2

2530i.09 1.26

4/6( 7 F)6p? 5

/

2

2381t2J20 1.125

9

/2 25336.52 1.010

4/6

( 7 F)6p? 3

/

2

23962715 1.25 4/6

( 7 F)6p? 3

/

2

25361.0 1.49

3

/

2

21t013.56 0.83 4/6

( 7 F)6p? ll/2 25385.36 1.49
177

Sm II, Odd Parity—Continued Sm II, Odd Parity—Continued

Configuration Term J

Level (cm -1

) 9 Configuration Term J

Level (cm -1

) 9

5h 2541 7.

0.82 4/6

( 7 F)6p? 7

/ 2 271,61,20 1.206

S/2 2551,6.03 0.77

8 H° 3

/ 2 271,92.95 -0.225

3

/2 25552.80 1.86 7

/ 2 27552.1# 1.30

4/6( 7 F)6p? 7/ 2 25565.97 1.33 4/5 5d6s? S

/2 27631.18 1.165

4/6( 7 F)6p? 9

/2 25597.70 1.535 4/6

( 7 F)6p? 1X /2 27638.83 1.315

4/6( 7 F)6p? 13/2 25664.97 1.415

13

/2 27639.1,0 1.26:

7

/ 2 25790.15 1.25 4/5 5d6s? 13/2 27695.96 1.36

4/5( 6 H°)5d6s? 15/2 25939.87 1.405

9/2 27821,. 7

1.105

4/5( 6 H°)5d6s? 5/

25980.32 1.33

3

/

27829.77 1.185

4/6( 7 F)6p? 9

/2 2601,6.35 1.34

9

/

2781,9.30 1.505

7

/

26086.63 1.30

5/2 27923.96 0.760

7 /2 26159.60 1.28

3

/27912.33 2.18

5

/2 26190.92 1.32:

11/2 2798721, 1.35

5/2 262U.05 0.645:

7

/

2799725 1.170 8p° 1 h 26253.55 3.59

3

/ 2 28011.88 0.155

5

/

26357.90 1.20

9

/28022.50 1.10

ii/2 261,1329 1.15 4/5 5d6s? 7 /2 28072.33 1.375

8G° V2 261i.1i2.18 -1.21 V2 28112.79 -0.470

3

/

261#1,.66 0.25

1

/ 2 28151.1,0 1.49

4/6

( 7 F)6p? ii/2 26505.53 1.535

9

/

28191.96 1.46

7

/

26509.67 0.835

00 K

O 3

/28239.51, -0.025

4/6

( 7 F)6p? 13/2 2651,0.12 1.51

7

/

28256.32 1.085

4/6( 7 F)6p? 9

/

26565.61 1.28

9

/

2831218 1.30

3

/

26599.08 1.630

5

/2839201, 0.865

4f

5 5d6s? 8G° l h 26690.30 -1.100

5

/

28129.38 1.775

3/2 26723.87 1.05

7

/

281,12.12 1.225

7

/

26771.62 0.785 4/6

( 7 F)6p? 11/2 28520.12 1.46

4/5 5d6s? 9

/

26820.81 1.415 u/2 2855298 0.775

4f6

( 7 F)6p? n/2 2682829 1.315

S

/2 28573.13 0.74

ll/2 26880.60 1.29

5

/2 28672.08 1.215

4/5 5d6s? 15/2 26889.18 1.395

9

/2 28725.53 1.315

7

/

26938.1# 1.50

7

/

28730.11, 1.11

5

/

26971,-67 0.980

3

/

28812.92 0.06

9

/

2700120 1.32

X1 /2 28850.60 1.50

4/5 5rf6s? 3

/

27063.30 0.860

9

/

28913.99 1.380

5

/

27078.30 0.84

5/2 28929.72 0.565

7

/

27107.62 1.11

3

/

28938.55 0.92

5/2 27165.35 0.92

1 /2 28980.58 3.130

4/6

( 7 F)6p? 7

/ 2 27188.30 1.20 n/2 28988.79 1.31

X /2 27210.12 -0.485 4/5 5d6s? 9

/

28997.1 1, 1.39

4/6

( 7 F)6p? !5/2 2726325 1.445 13/2 29123.57 1.38

5

/2 27281,-69 1.47 u/ 2 2913723 1.210

4/5 5d6s? 9

/

27309.73 1.335

5

/

29238.56 0.645

9

/ 2 27386.69 1.060

7

/ 2 2921,6.00 1.470
178

Sm II, Odd Parity—Continued Sm II, Odd Parity—Continued

Configuration Term J

Level (cm -1

) 9 Configuration Term J

Level

(cnrr 1 ) 9

7

/ 2 29310.16 1.31 7

/ 2 30816.69 1.060 u/2 2931 423 1.31 4/5 5d6s? 13/2 30879.74 1.425

9

/ 2 29387.87 1.17 7

/

2

30954.05 1.105

5 /2 29391.38 0.76 9

/

2

30969.35 1.19

8G° V2 291,22.65 -1.185 13

/ 2 30970.56 1.285

1 V2 291,93.71 1.400 11 h 30981.48 1.245

? /2 29509.60 1.23 3/2 31045.47 1.69

3

/2 29533.82 1.710 3/2 31052.45 1.09

9

/

2

29591.12 1.37 8p° */2 31089.52 3.38

7

/

2

29619.89 1.00 9

/

2

31120.96 1.055 4/6

( 7 F)6p? 13/2 2961,0.51 1.505 1 1/2 31122.17 1.265

3/2 29655.90 0.88 8 D° 3/2 31171.00 2.665

5

/2 29732.66 2.250 1 h 31186.00 -0.08

il/ 2 29801.08 1.29 9

/2 31189.83 1.29

9

/

2

29801,-88 1.27 3/2 31194.15 0.720

3 /2 29891,23 -0.135 7

/

2

31215.08 1.145

13/2 29913.1,2 1.51 il/2 31255.90 1.42 4/5 5d6s? 11/2 29934-80 1.435 3/2 31309.40 1.900

5/2 29986.51, 1.15 9

/2 31320.00 0.93

9

/

2

29998.15 1.17 3/2 31332.65 1.76

S

/2 30031.1,7 1.125 9

/2 31352.93 1.69

3

/

2

30082.93 0.150 15

/ 2 31383.62 1.43

9

/

2

30104- 7

8

1.145 15/ 2 31441.34 1.230

7

/

2

30112.78 1.06 11/2 31521.61 1.485

13/2 30123.89 1.36 7

/2 31566.40 1.525

00 o 1 h 30252.90 3.86 Xl/2 31575.55 1.135

i5/ 2 30278.1,6 1.38 3/2 31599.63 1.55

3

/

2

30302.73 1.015 3/2 31638.79 1.595

9/2 3031,5.63 1.605 15/2 31646.49 1.295

7

/

2

30348.66 1.82: 3/2 31669.82 1.52

S

/2 301,4322 1.42: 3/2 31701.67 1.250

13

/ 2 30445.87 1.33 3/2 31725.56 1.916

9

/

2

30449.12 0.74 ii/2 31768.14 1.18

7

/

2

30511.73 1.28 7

/

2

31 774-52 1.285 H/2 30513.43 1.255 1X /2 31830.06 1.28

9

/

2

30514-16 1.36 V2 31902.10 -0.54

3

/2 30539.73 1.965 7 /2 31915.67 1.46

13

/ 2 30546.75 1.27 4/5 5d6s? 15/2 31926.40 1.415

8G° V2 30599.86 -0.69 3/2 31954-10 1.94

9

/

2

30652.56 0.90 11/2 31978.55 1.23

3/2 30669.65 0.69 13/2 31998.58 1.34

9

/

2

30681.79 1.200 9/2 32006.64 1.12 n/2 30710.03 1.38 3/2 32053.66 1.275

3/2 30756.88 2.24 ll /2 3206028 1.285
179

Sm II, Odd Parity—Continued Sm II, Odd Parity—Continued

Configuration Term J

Level (cm' 1 ) 9 Configuration Term JLevel (cm 1 ) 9

>/2 3206740 -0.150 9

/ 2 33772.5k 1.14

13/2 32130.57 1.33 11

/ 2 33775.8k 1.41

7 /2 3220U.31 1.47 13/2 33809.85 1.310

3

/2 32223.1(5 1.285 9

/ 2 33852.93 1.11

13/2 32286.05 1.27 7

/ 2 33881.9k 1.44

1 h 3229632 2.74 15/2 3393k.k8 1.280

9

/ 2 32299.89 1.355 9

/ 2 3k0k0.37 1.35

7

/

323UM 1.310 5

/2 3k066.75 1.58

9

/2 3231(5.32 1.510 3

/

3k068.kl 1.540

3

/

32358.56 1.42 11/2 3kl33.81 1.27

7

/

32380.78 1.52 l 3

/

3klk5.kk 1.440

5

/2 32397.1(8 1.06 11/2 3kl88.k7 1.395

9/2 321,31(.70 1.455 n/2 3k205.91 1.26

7

/

321(51.66 1.22 u/2 3k330.90 1.33

3

/

321(92.65 2.07 9/2 3k37k-70 1.21

ll/2 32513.09 1.230 U/2 3kkl8.95 1.46

7 /2 3251(9.6J( 1.60 5/2 3kk53.83 0.95

71 /2 32589329 1.230 18/2 3kk57.57 1.23

5/2 32603.65 1.44 9

/ 2 3kk96.00 1.090

5 /2 32675.1

1.16 7 /2 3k505.80 0.89

S

/2 32685.70 1.665 9

/ 2 3k72226 1.43

11 h 32690.37 1.240 13/2 3k7k5.k7 1.02:

13/2 32726.78 1.205 13/2 3k768.kl 1.35:

13/2 32852.81 1.360 13 /2 3k890.85 1.33

9

/

32857.5k 1.36 3/ 2 3k910.60 0.58

5

/

32935.k3 1.175 5

/

3k91349 0.945

9

/ 2 329k5.19 1.39 9

/

3k95 1.90 1.320

3

/

33069.10 1.83 7

/

35101.70 0.80

5

/ 2 33107.10 0.84 u/2 3519221 1.09

11/2 33153.69 1.42 15/2 3526120 1.32

5

/2 33218.75 1.500 7

/

35303.60 1.12

3

/

33227.9 1.73 9

/

353k3.60 1.36

9

/

33252.k5 1.22 9/ 2 35k63.91 1.295

11/2 33286.30 1.25 V2 35535.52 -1.19

7

/ 2 33333.W 1.43 U/2 355k7.50 1.415

9

/ 2 3336k-81 1.64 5

/ 2 3558340 0.98

5

/

33539.60 1.55 3

/ 2 35966.59 1.20

7 /2 33576.60 1.07 9

/ 2 36107.66 1.270 n/2 33598.70 1.39 V2 37k88.95 -0.40

9

/ 2 33613.k3 1.12 3

/ 2 37569.11 0.58

7

/ 2 3363020 1.07 3

/ 2 3758627 0.55

s F

° V2 3366126 3.00 19/2 38505.66 1.36

5/2 33689.50 1.47

15/2 33763.k5 1.34 Sm III ( 7 Fo) Limit 89300
180

Sm III

(Nd i sequence; 60 electrons) Z=62

Ground state (ls 2 2s 2 2pfi 3s 2 3p6 3d 10 4s 2 4pfi 4d 10 5s 2 5pfi ) 4/ fi 7 F0

Ionization energy 189000± 2400 cm 1 23.4± 0.3 eV

All the levels except 4/ 6 5 D() 3 are from Dupont’s analysis of spark emission spectra [1967].

His list of approximately 15000 lines (1800-9500 A) assigned to Sm hi has not been published.

The levels given here classify about 100 lines in the region 1935-4033 A as 4/ fi 7 F —

4/ 5

(

fi H

0

, 6 F°, fi P°)5c? transitions [Dupont, 1966]. A number of tentative levels listed in Dupont’s

thesis but not included in the 1967 publication were also omitted here.

The spectra of Sm2+ ions in several different types of crystals have been observed [see

compilation in Dupont, 1967], We have listed only the lowest of the 4/ e r> D levels from the

BaClF:Sm 2+ data of Kiss and Weakliem [1965] in order to approximately locate this important

term. The position of this level in the free ion is probably higher; i.e., “x” is probably positive

and may be as great as several hundred cm

-1

. The 5 D term extends to above 20000 cm

-1

. The leading percentages for the 4/ 6 7 F and 5 D terms are from Ofelt’s calculation [1963].

Dupont based the identifications of the 4/ 5 5d levels on the calculations of Becher [1965], who

did not list the eigenvectors. The levels have been arranged into terms following Dupont’s names; a number of the analogous Sm I 4/ 5 5c?6s 2 levels have eigenvector purities less than

50%.

The lowest predicted terms of the 4/ 5 5d configuration are ( 6 H°) 7 K° and 7 I°, with the 7 K°

level predicted a little above 24000 cm

-1

. These and some of the other missing terms of the

4/ 5 5d configuration can probably be found after the analysis is extended to include the 4/ 5 6s and 4/ 5 6p configurations.

Sugar and Reader obtained the ionization energy.

References

Becher, J., Thesis, Johns Hopkins Univ., Baltimore, 135 pp. (1965); (Univ. Microfilms, Ann Arbor, Mich., No. 66-4956). PT

Dupont, A., Thesis, Johns Hopkins Univ., Baltimore, 98 pp. (1966); (Univ. Microfilms, Ann Arbor, Mich., No. 66-7025). EL CL W

Dupont, A., J. Opt. Soe. Am. 57, 867 (1967). EL

Kiss, Z. J., and Weakliem, H. A., Phys. Rev. Lett. 15, 457 (1965). [EL]

Ofelt, G. S., J. Chem. Phys. 38, 2171 (1963). PT

Sugar, J., and Reader, J., J. Chem. Phys. 59, 2083 (1973). IP

[July 1976]
181

Sm III

Configuration Term J

Level (cm 1

) Leading percentages

4/e 7 F 0 0.00 94 35 D1

1 293.45 95 2

5 D1

2 813.55 96 2

5D1

3 1492.66 94 1 5 D3

4 2277.88 98 1 S F2

5 3131.54 98 l 5G1

6 4026.99 97 l 5G1

4/6 5 D3 0 [14533]+x 48 29 5 D1

1 52 31 2 56 33 3 56 34 4 55 34

4/5

( 6 H°)5d 7 H° 2 26283.55

3 27361.55

4

5 29377.26

6

78

4/5( 6 H°)5d 7 p° 0

1 27885.89

2 28228.81 3 29121.36

4 30198.89

5 31376.56

6 32868.01

4/5( 6 H°)5d 7 G° 1 28631+.31+ 2 29763.82

3 30608725

4 31556.56

5 323hi.80

6 33710.00

7

4/5

( 6 F°)5d o o

t' 1 3001+8.1+8 2 3091+8.50 3 31657.02

4 32598.82

5 33771.89

6

7

4/5( 6 F°)5d 7jr° 0

1 31+81+6.60 2 35311+.66 3 35928.00

4 36826.12

5 37738.1+1+ 6 38758.03

4/5( 6 F°)5d 7 D° 1 3631+7.51+ 2 36931.88

3 37715.91

4 38711+.36 5 39666.78

4/5

( 6P°)5d 7 D° 1 51160.80

2 511+3229

3 5191+0.36 4 5311+9.58 5

Sm iv ( 6 HI/2 ) Limit 189000
182

[Sm IV]

(Pr i sequence; 59 electrons) Z=62

Ground state (ls 2 2s2 2p6 3s 2 3p6 3d 10 4s 2 4p6 4d 10 5s 2 5p6

) 4f

5 6 H5/2

Ionization energy 334000± 6000 cm 1 41.4± 0.7 eV

No analysis of the free-ion spectrum has been carried out. Most of the levels here are averages of corresponding sublevels of Sm3+ in LaCls

. Both absorption and fluorescence

spectra were observed and analyzed at the Johns Hopkins University [Magno, 1958; Wybourne, 1962; Magno and Dieke, 1962; Dieke, 1968]; we have relied mainly on the data in Dieke’s book [1968], His values were tabulated with zero energy at the lowest sublevel arising

from the fi Hj/2 ground level, instead of at the average of the 6 H5/2 sublevels (36 cm

-1 higher).

No corresponding correction of the higher levels was made here, since overall better

agreement with the solution absorption data of Carnall, Fields, and Rajnak [1968] is obtained

without the correction. Four new levels not included in the earlier references are taken from

Crosswhite, Crosswhite, and Oats [1976], These levels are also based on the spectrum of Sm3+

in LaCL,.

A number of levels above the range covered here are given by Dieke [1968] (to —31500 cm

-1

) and by Carnall et al. [1968] (to 47400 cm" 1 ). The g values are from Wybourne’s compilation [1962]. Some references for the original

Zeeman data are given below.

Carnall, Fields, and Rajnak [1974] calculated the tabulated eigenvector percentages; their

matrices included spin-orbit and effective interactions.

The ionization energy is from Sugar and Reader. The estimated uncertainty has been

approximately doubled, as recommended by Spector and Sugar, and the value rounded off accordingly.

References

Carnall, W. T., Fields, P. R., and Rajnak, K., J. Chem. Phys. 49, 4424 (1968). [EL] [CL] [W] PT

Carnall, W. T., Fields, P. R., and Rajnak, K., unpublished material (1974). ND PT

Crosswhite, H., Crosswhite, H. M., and Oats, M., unpublished material (1976). [EL] PT

Dieke, G. H., Spectra and Energy Levels of Rare Earth Ions in Crystals, Ed. H. M. Crosswhite and H. Crosswhite, pp. 233-242 (Interscience Publishers, New York, 1968). [EL] [CL] [W] [ZE]

Friederich, A., Hellwege, K. H., and Lammermann, H., Z. Phys. 159, 524 (1960). [ZE]

Judd, B. R., Proc. Phys. Soc. London, Sect. A 69, 157 (1956). PT

Lammermann, H., Z. Phys. 160, 355 (1960). [ZE]

Magno, M. S., Thesis, Johns Hopkins Univ., Baltimore (1958). [EL] [CL] [W] [ZE]

Spector, N., and Sugar, J., J. Opt. Soc. Am. 66, 436 (1976). Sugar, J., and Reader, J., J. Chem. Phys. 59, 2083 (1973). IP Wybourne, B. G., J. Chem. Phys. 36, 2301 (1962). ND PT

[July 1976]
183

[Sm iv]

Configuration Term J

Level (cm -1

) 9 Leading percentages

4/

5 6 H

° 5

/2 0 96 2

4 G°4

7 /2 [1080] 0.79 97 24G°4

9

/[2290] 1.00 98 1 4G°4

11

1

[3610] 98 1 4 I°3

13/2 [4990] 98 2

4 I°3

15/2 [6470] 96 34 I°3

4/

5 ep° 1 h [6290] 97 1 4 D°2

3

1 2 [6540] 96 1 4 F°3

5

/

[7050] 95 2

4 F°3

7 /2 [7910] 95 24 F°3

9

/2 [9080] 96 2

4 F°3

n/2 [10470] 1.44 97 1 4G°3

4/5 5

/

[17860] 0.79 29 4G°4 21 4 F°3

4/5 4 F°3 3

/2 [18860] 0.44 68 15 4 F°1

4/5 7 /2 [20010] 1.08 34 4G°4 20 4 F°3

4/5 4 I°3 9

/

[20560] 80 15 4 I°1

ll/ 2 [20980] 63 18 4 K°1

13/2 [21550] 1.02 46 22 4 K°1

15

/ 2 47 15 4 K°1

4/5 4 M° 15/2 [20750] 74 8

4 L°

17

/ 2 [22530] 86 9

4 L°

19/2 91 7

4 L°

21/ 2 95 5

2 N°

Sm v ( 5

I 4 ) Limit 334000
Sm XXXV

(Ni i sequence; 28 electrons) Z-62

Ground state (ls 2 2s 2 2pfi 3s 2 3p6

) 3d 10 ‘S0

The levels are from Burkhalter, Nagel, and Whitlock, who classified the 3d 10 'S0 —

3d 9 4p(J=l) and 3d 10 *S 0 —3d9 4/(J=l) resonance lines of Sm XXXV, Gd XXXVII, and Dy XXXIX.

These authors produced spectra in the region 5-15 A by focusing light from a pulsed laser onto rare-earth targets. We have converted the levels from units of eV to units of 104 cm

-1 (equivalent to 1.23985 eV). The uncertainty of the measurements is about 2xl04 cm ’. Burkhalter et al. classified the transitions using regularities along the Ni I isoelectronic

sequence and comparisons with calculated energies. The location of the 3d9 4/(%,5/2)° level is tentative in all three spectra.

Although the J x j designations assigned by Burkhalter et al. are listed for both of the

excited configurations, the 3d9 4/ levels may also be assigned fairly appropriate LS names (see

Gd xxxvii).

Burkhalter et al. discuss the spectral and configurational assignments of several other

groups of Sm, Gd, and Dy lines with wavelengths down to about 5 A. Observations with higher

resolution may be necessary before more detailed energy level classifications can be made.

Reference

Burkhalter, P. G., Nagel, D. J., and Whitlock, R. R., Phys. Rev. A 9, 2331 (1974). EL CL W

[July 1976]

Sm xxxv

Configuration Term J

Level

(10 4 cm-1

)

3d10 ‘S 0 0.0

3d9

( 2 D3/2)4pi/2 ( 3/2,V2)° 1 836

3d9

( 2 D5/2)4p3/2 ( 5

/2,3 /2)° 1 8U6

3d9

( 2 D3/2)4p3/2 ( 3

/2,3

/ 2

)° 1 867

3d9

( 2 Ds/2)4/5/2 ( 5

/2,5/2)° 1 10151

3d9

( 2 D5/2)4/7/2 ( 5/2,

7

/ 2

)° 1 10w

3d9

( 2 D3/2)4/s/2 ( 3

/2,5/2)° 1 1069
185

EUROPIUM

Eu i

63 electrons Z=63

Ground state (ls 2 2s 2 2p6 3s 2 3pfi 3d lu 4s 2 4p'! 4<i

10 5s 2 5p6

) 4/ 7 6s 2 8 S°/2

Ionization energy 45734.9± 0.2 cm 1 5.67045± 0.00003 eV

Identified odd configurations 4/ 7 6s 2

, 4/ 7 5c?6s, 4/ 7 6s7s, 4/ 7 5d 2

, 4/ 7 6s6tf, 4/ 7 6s8s,

4/ 7 6s7d, 4/ 7 6p2

Identified even configurations 4/ 7 6s6p, 4/ 7 5d6p, 4/ fi 5c/6s 2

, 4/ fi 5d2 6s, 4/ 7 6s7p-18p,

4/ 7 6s42p-67p, 4/ 7 6s5/?, 4/ 7 6s6/?, 4/ 7 6sl4/?,

4/ 7 6sl5/?, 4/ 7 5d7p?

Spectrum Observations, Main Sources of the Levels

King [1939] observed 3950 europium lines from 2100 to 10165 A and assigned almost 2200

lines to Eu I. More than 1100 lines were classified by Russell and King’s extension [1939] of

their earlier analysis of Eu I, including practically all the strong lines. In the tables here, the

term designations preceded by a small letter, as well as the numerical designations assigned to some of the levels, are as given by Russell and King; their line list may be used directly to identify the combinations of these levels. The other odd levels and a number of the remaining even levels below the ionization limit were also found by Russell and King, but their original

designations have been omitted or changed on the basis of more recent work (see below). Most

levels with a question mark after the position were given as uncertain by Russell and King.

We have omitted their z

6 F 1/2 level (36586.37 cm '), as there appears to be no experimental

basis for its existence independent of combinations of the y

8 D:{/2 level (36586.35 cm A- We assigned parentages for some of the terms designated by Russell and King that have

not been calculated. In the case of one or two subconfigurations of the type 4/ 7

( K S°)6sw( for

which the best coupling order of the electrons was not clear, we chose the order

4/ 7

( 8 S°)6s ( 9 - 7 S°)nl. Smith and Tomkins [1975a, 1975b] have observed the Eu I absorption spectrum in the

region 2100-7200 A. Since all the lines were transitions from the 4/ 7 6s2 8 S°/2 ground level, the

upper levels have even parity and one of the three J values %, %, or %. Most of the extensive

system of even levels above about 40000 cm” 1 was found in this work. The more recent measurements begin at 27852 cm” 1

, with the lowest new level, at 31203 cm” 1

, belonging to the

10 1 term of the newly found 4/ 6 5d2 6s configuration. We give an average level value wherever

the wavenumber of an absorption transition to a previously known level differed by more than

±0.1 cm" 1 from Russell and King’s value for the level. The two long np series based on the

Eu ii 4/ 7

( 8 S°)6s ( H S°) and ( 7 S°) limits, respectively, were measured by Smith and Tomkins

[1975a]. The members of these series below n=42 are part of the complex absorption spectrum

that has not yet been fully interpreted (see below).

g Values

All except a few of the g values for the even levels were derived by Smith and Tomkins

[1975b] from Zeeman patterns observed in absorption. The uncertainties vary from one to a few units in the last decimal place, the less accurate values being obtained from perturbed or unresolved patterns. For a few even levels, mostly belonging to the 4/ 7

( 8 S°)6s6p group, we

derived g values from the Zeeman patterns of Russell, Albertson, and Davis by assuming (or

225-298 0 - 78 - 13
186 Eu I —Continued

correcting to) the value 1.993 for the ground-level value. These values were averaged with

those from Smith and Tomkins for levels included in both sets of data. The g values measured

by Handrich, Kretzen, Lange, and Steudel [1968] were also used or averaged in for three of

these levels. The g value for the ground level is from Pichanick and Woodgate [1961], who give the

uncertainty as ±0.00007. The leading percentages for this level are from Conway and

Wybourne [1963], the more precise values being 97.5% and 2.4%.

Theoretical Interpretation, Calculations

Several calculations of various Eu I configurations have shown the need for new

observations of the emission spectrum and further extension of the analysis. In deciding

whether to include possibly doubtful or incorrect former designations we relied heavily on the

comments of Smith and Wybourne [1965], who have given the most complete discussion of this spectrum based on modern calculations. The odd levels given here without term or numerical

designations were assigned to 4/ 7

( 8 S°)5d2 and ( 8 S°)6s6d by Russell and King. These

subconfigurations no doubt contribute strongly to the compositions of most of the

undesignated odd levels around 35000 cm

-1

, but Smith and Wybourne showed that the specific

designations omitted here were unreliable. Some even levels previously assigned to the

( 8 S°)6s7p or ( 8 S°)5d6p subconfigurations are also listed without names. The ( 8 S°)6s8s subconfiguration is perturbed, as evidenced by the position of the lower of

the two 8 S°/2 levels below the 10 S 9/2 level. Smith and Wybourne suggest that the ( 8 S°)6s8s 8 S°/2 levels are perturbed by the intervening ( 8 S°)5d 2 8 S°/2 level at 37994 cm -1

. The 4/ 7

( 8 S°)5d6s, ( 8 S°)6s6p, and ( 8 S°)5d6p subconfigurations were calculated by

Goldschmidt and Nir, and the percentages for the latter two groups are from their results. These authors also discuss the coupling order of the electrons and the type of coupling for

several configurations. The leading percentages for the (

8 S°)5d6p levels are given in each of

two LS schemes which differ in coupling order. The second scheme (the direct coupling of the

two external electrons) was used by Smith and Wybourne, and is the most appropriate order

for the ( 8 S°)6s6p levels. Wyart has made a calculation of 4/ 7

(

8 S°,6 P°)5d6s and fitted the known levels, which belong

nominally to the four terms a

10 D°, a

8 D°, b

8 D°, and a ^D0 of (

8 S°)5d6s. The electrons were

coupled in the order shown by Goldschmidt and Nir to be most appropriate, but Wyart’s

inclusion of the 4/ 7

( 6 P°) core term gave eigenvector purities considerably lower than those

previously obtained with the 4/ 7

( 8 S°)5d6s approximation. The percentages given here are from

Wyart. The compositions of the eight levels with J values common to the a

6 D° and b

8 D°

terms (based on the 7 D° parent) are rather strongly mixed by inclusion of the 4/ 7

( 6 P°)

grandparent.

The leading percentages for the ( 8 S°)6s6p levels are given in both LS coupling and in the

J X J2 scheme that Goldschmidt and Nir showed to be physically best. Bordarier, Judd, and

Klapisch calculated the ( 8 S°)6s6p group with the interaction parameters constrained to fit the

experimental value of the ratio of the Eu n ( 8 S°)6p 9 P

7 P term difference to the ( 8 S°)6s 9 S°

7 S° difference. The analysis indicated a perturbation of Eu I ( 8 S°)6s6p, with the ( 8 S°)( 1 P°) 8 P

term being most affected, and the hfs calculation gave a large deviation from experiment for

the ( 8 S°)('P°) 8 P9/2 level. One known interaction of the ( 8 S

0 )6s6p('P°) 8 P term is with the ( 8 S°)5d ( 7 D°)6p 8 P term

found by Smith and Collins near 42000 cm The latter term, which belongs mainly to

( 8 S°)5d6p(‘P0

) 8 P if calculated in the alternate coupling order, is even higher than had been

predicted by Smith and Wybourne. Smith and Collins explained the discrepancy as due to interaction with the ( 8 S°)6s6p('P0

) 8 P term; they calculated a configuration admixture of about

15% between these two terms. Since the calculation of 4/ 7

(

8 S°)6s6p+( 8 S°)5d6p is not available,

the percentages given here unfortunately do not include this interaction. (Smith and Collins

state that the configuration mixing of the other terms is small.)

Smith and Wilson assigned 17 even levels to terms of 4/ 6

(

7 F)5d6s 2

, and the tabulated

percentages are from their calculation. Their changes of the J values of two of the levels are accepted here. No levels of the predicted lowest term of this configuration, 4/ fi (

7 F)5d6s 2 8 H,

are yet known. Smith and Wilson noted that the “102” and “110” levels are based on weak

lines and apparently do not belong to 4/ 6

( 7 F)5c?6s2

; “these may therefore be unreal.”
Eu I —Continued 187

High Even Levels Based on Absorption and

Photoionization Spectra

The configuration and term designations for the even levels in the region 31000-45200 cm 1 given without leading percentages are from Smith and Tomkins [1975b], The

interpretation of this complex system of high even levels based mainly on absorption spectra is

still in progress. Overlapping configurations of the types 4/ 6 5d6s 2

, 4/ fi 5d 2 6s, 4/ 7 5dnp, 4/ 7 6swp,

and 4/ 7 6sre/ are already known to contribute to the system. Many of the designations are given

as tentative pending completion of the analysis.

Final term designations are omitted for the 4/ 7

( 8 S°)6s (

fl S°)np and ( 7 S°)np series members

above lOp, pending a determination of the appropriate coupling scheme. These series are in general perturbed in the region below the very high members listed by Smith and Tomkins

[1975a], They conclude that most of the absorption lines in the region 45200-45655 cm 1 can probably be accounted for by several highly perturbed series [Smith and Tomkins, 1975b]; only

a few of the upper even levels corresponding to the stronger transitions in this region are

listed here.

The levels above the Eu ii ( 9 S°) principal limit include, in addition to the high ( 7 S°)np

series members, a group of levels followed by the letter “a” (for autoionization). Parr [1971]

obtained these levels from photoionization resonances. The technique involved absorption

transitions from the 8 S° /2 ground level, and Smith and Tomkins [1975a] note that “... some

feature is visible in our spectra at or near most of the maxima listed by Parr.” The values for

the two autoionizing levels tentatively assigned to the lower 8 P term of 4/ 7

( 8 S°)5d7p are from

absorption data [Smith and Tomkins, 1975b] that may be somewhat more accurate than Parr’s determinations. These term assignments were suggested by Parr and also by Smith and

Tomkins [1975b]; we have omitted more specific suggestions for the J values. Parr assigned

eight more of these levels to 4/ 7

( 8 S°)5dwp 8 P terms (n=7—10). The designations are consistent

with quantum defect data, but are omitted here, pending a more detailed theoretical treatment. Configuration-interaction calculations for the ground level and for a number of high even configurations, especially those that can contribute 8 P components, will probably be

required for interpretation of the complex absorption spectra in this region.

Ionization Energy

Smith and Tomkins [1975a] derived the value 47404. 1±0.2 cm 1 for the Eu II 4/ 7

( 8 S°)6s 7 S°

limit from the high members of the (

7 S°)wp series. This result gave a value of 45734.9±0.2 cm

'

1 for the Eu II 4/ 7

( 8 S°)6s 8 S° limit, which is the principal ionization energy. The new

determination agrees well with the less accurate value of 45740 cm

-1 derived by Russell and

King, and also with the value 45680±65 cm 1 obtained by Parr from his photoionization

measurements.

References

Bordarier, Y., Judd, B. R., and Klapiseh, M., Proc. R. Soc. London, Ser. A 289, 81 (1965). Hfs PT

Conway, J. G., and Wybourne, B. G., Phys. Rev. 130, 2325 (1963). AT

Goldschmidt, Z. B., and Nir, S., Physica (Utrecht) 51, 222 (1971a). ND PT

Goldschmidt, Z. B., and Nir, S., unpublished material (1971b). PT

Handrieh, E., Kretzen, H., Lange, W., Steudel, A., Wallenstein, R., and Walther, H., Proc. Int. Conf. Optical Pumping

At. Line Shape, Ed. T. Skalinski, pp. 417-432 (Warsaw, June 25-28, 1968). ZE Hfs

King, A. S., Astrophys. J. 72, 221 (1930). W Hfs

King, A. S., Astrophys. J. 89, 377 (1939). W

Parr, A. C., J. Chem. Phys. 54, 3161 (1971). EL CL W IP

Pichanick, F. M. J., and Woodgate, G. K., Proc. R. Soc. London, Ser. A 263, 89 (1961). ZE

Russell, H. N., Albertson, W., and Davis, D. N., Phys. Rev. 60, 641 (1941). ZE

Russell, H. N., and King, A. S., Phys. Rev. 46, 1023 (1934). EL CL W IP

Russell, H. N., and King, A. S., Astrophys. J. 90, 155 (1939). EL CL W IP

Smith, G., and Collins, B. S., J. Opt. Soc. Am. 60, 866 (1970). EL CL PT

Smith, G., and Tomkins, F. S., Proc. R. Soc. London, Ser. A 342, 149 (1975a). EL CL W IP

Smith, G., and Tomkins, F. S., unpublished material (1975b). [This material is included in a recent publication: see Smith, G., and Tomkins, F. S., Philos. Trans. R. Soc. London, Ser. A, 283, 345 (1976).] EL ND CL W ZE IS Smith, G., and Wilson, M., J. Opt. Soc. Am. 60, 1527 (1970). ND PT

Smith, G., and Wybourne, B. G., J. Opt. Soc. Am. 55, 121 (1965). ND PT

Wyart, J. F., Thesis, Univ. Paris-Sud, Orsay, 194 pp. (1973). PT

[July 1976]
188

Eu I, Odd Parity

Configuration Term J

Level (cm -1

) 9 Leading percentages

4/7 6s2 a

8 S° 7

/ 2 0.00 1.99340 98 2

6P°

4/7( 8S°)5d ( 9D°)6s a

10 D° S

/2 12923.72 94

7 /2 1301*8.90 94

9

/2 13222.01* 93 ”/2 131*5721 94

13/2 13778.68 95

4/7

( 8S°)5d ( 9 D°)6s a

8 D° 3

/ 2 15137.72 87

5

/ 2 1521*8.76 86

7

/ 2 151*2125 85

9

/ 2 1568028 85

71 /2 16079.76 87

4/7

( 8 S°)5d ( 7 D°)6s a

6 D° 9

/2 1927321* 66

7

/ 2 19361*.50 65

5

/ 2 191*62.05 70

3

/ 2 1951*3.69 80

1 h 19599.16 94

4/7( 8 S°)5d ( 7 D°)6s 6

8 D° ii/2 191*1*7.19 >

00 9

/ 2 1963126 59

7

/ 2 19712.15 58

5

/ 2 19763.78 63

3

/ 2 19791*21 73

4/7

( 8 S°)6s ( 9 S°)7s e

10 S° 9/2 28763.82

4/7

( 8 S°)6s ( 9S°)7s e

8 S° 7

/ 2 29517.86

4/7

( 8 S°)6s ( 7 S°)7s e

6S° 5

/ 2 30619.1*9

4/7( 8 S°)6s ( 7 S°)7s /

8 S° 7 /2 31217.30

4/7( 8S°)5d2

( 3P) e

10 P° 7

/ 2 3181*8.81

9

/

2

32209.88

11/2 321*80.95

1° 5/2 31*065.73

2° 3

/2,5

/2 31*081.16

3° 7

/2,9

/2 31*126.1*2

4° 7/2,9

/2, ll /2 31*306.36

4/7( 8 S°)6s ( 9S°)6d e

10 D° 5/2 31*1*22.91*

7

/

2

31*1*1*0.50 9

/ 2 31*1*66.80

11/2 31*505.55

18/2 31*51*1*.59

8 D°? 3

/ 2 31*913.59?

8 D°? 5/2 31*967.69

8 D°? 7

/ 2 35033.98

4/7( 8 S°)5d2 ? 8p°7 7

/ 2 3505323

8 D°? 9

/ 2 35106.9

A

4/7( 8 S°)5d2 ? sp°? 5/2 35171*20

8 D°? 11 la 3520A.58

4/7( 8 S°)5d2 ? sp°? 9

/ 2 35280.1*3

8 D°? 3

/2 3528222
189

Eu I, Odd Parity—Continued Eu I, Odd Parity—Continued

Configuration Term J

Level (cm' 1 ) Configuration Term J

Level (cm 1

)

8 D°? 7

/ 2 35377.9b 4/7

( 8 S°)6p2( 3 P) j

iop° 7

/ 2 b0298.02

9

/ 2 b085b.H

8 D°? 5

/ 2 35398.16 n/2 blbb3.70

8 D°? n/2 35U60.7U 5° 7

/

b0576.00

8 D°? 9

/ 2 3581347 6° 5

/2, 7/2 b062b-10

4/7( 8 S°)6s ( 7 S°)6d <7 8 D° 3

/2 36014-39 7° 7

/

b0650.51

5 /2 36072.62

7

/ 2 36097.6b 8° 9

/ 2, 11 /2 b076b.08

9

/ 2 36219.00 n/2 362U2.3U 9° 9

/ 2 b0768.31

4/7( 8 S°)6s ( 7 S°)6d e

6 D° 9

/ 2 36566.6b 10° 7/ 2, 9

/

b0993.18

7

/ 2 3658948

5

/ 2 3660842 11° 7 /2,9

/2 b103 7.581

3

/2 36622.00

l h 3663046 4/7

( 8 S°)6s ( 7 S°)7d /

6 D° 9

/ 2 bll7b.7b

7

/ 2 bl 185.38 4/7

( 8 S°)6s ( 9 S°)8s g*S° 7 /2 36659.31 5 /2 bl20141

3

/ 2 bl208.60 4/7

( 8 S°)6s ( 9 S°)8s f

10 s° 9

/ 2 37195.76 V2

4/7( 8 S°)5d2( 3 P) e

6 P° 7

/

3758b-98 12° 9

/2, ll /2 bl37847

S /2

3

/ 2 38037.3b

38214.66

o

CO H 9

/2, 11 /2 bl395.92

14° 7

/2,9

/2 bl 631.3 7 4/7

( 8 S°)5d2(

1 S) /i 8 S° 7 /2 37993.98

15° 9

/2, 11 /2 14721.091 4/7

( 8 S°)6s ( 7 S°)8s /

6 S° 5

/2 38933.7b

16° 7

/ 2,9

/2 14100.66 4/7

( 8 S°)6s ( 7 S°)8s 1

8 S° 7 /2 392b2.56

17° 9

/2, 11 /2 14212.061 4/7

( 8 S°)6s ( 9 S°)7d /

10 D° S

/2 39267.62

7

/

3928b.73 18° ; /2,9

/2, 11 /2 14b66.82

9

/ 2 39306.13

n/2 14508.061 39332.68

19° 7

/2, 9

/2 1S/2 39369.19

4/7

( 8 S°)6s ( 9 S°)7d /i 8 D° lX/ 2 3914640

Eu II ( 9

9 S2) Limit 1473b-9

/2 39b9149

7

/ 2 39146.56

5

/ 2 39500.31

3

/
190

Eu I, Even Parity

Configuration Term J

Level (cm -1

) 9 Leading percentages

4/7( 8S°)6s6p(3P°) 2 1°P 7

/

2

14067.86 2.198 92 or 64 ( 8 S?/2 )(3 Po)

9

/

2

14563.57 1.936 85 or 91 ( 8S?/2)(3 P!)

n/2 15581.58 100 or 100 ( 8S?/2)(3PS)

4/7

( 8 S°)6s6p( 3 P°) 2

8 P 5

/2 15890.53 2.227 87 or 93 ( 8S?/2 )(3P?)

7 /2 15952.31 1.875 61 or 51 ( 8St/2 )(3P?)

9

/ 2 16611.79 1.797 83 or 91 ( 8S7/2)(3P2 )

4/7( 8 S°)6s6p(3 P°) 2

6 P7

/ 2 17340.65 1.787 64 or 82 ( 8S?/2)( 3P2)

5 /2 17707.42 1.932 86 or 92 ( 8S7/2 )(3PS)

3

/ 2 17945.49 100 or 100 ( 8S?/2)(3PS)

4/7( 8 S°)6s6p( 1 P°) y

8P S

/2 21444.58 2.272 98 or 99 ( 8S7/2)( 1 P!)

7

/ 2 21605.17 1.929 97 or 98 ( 8S7/2)( X Pi)

9

/ 2 21761.26 1.772 96 or 98 ( 8S7/2)( 1 P!)

4/6( 7 F)5d6s2 8 D 3/

2

5 /2 27852.90 2.009 68 15 ( 7 F) 6P

7 /2 28827.83 1.811 75 13 ( 7F) 8 F

9

/

2

29838.59 1.676 76 15 ( 7 F) 8 F

11 h 30819.44 77 17 ( 7 F) 8 F

4/7( 8 S°)5d ( 9 D°)6p 2

10 F 3

/2 28519.97 94 or 94 ( 8S°)5d6p(3 F°) 10 F

5

/2 28667.39 2.194 93 or 93

7 /2 28918.17 1.841 92 or 92

9

/

2

29186.32 1.70 92 or 92

11

/ 2 29612.69 93 or 93

13 /2 30211.09 97 or 97

15

/ 2 30923.71 100 or 100

102 9

/2 29045.75?

4/6( 7 F)5d6s2 8G X /2

3/2

S

/2 29124.78 1.440 44 20 (7F) s F

7

/

2

29809.23 1.465 56 21 ( 7F) 8 F

9

/

2

11/- 30642.61 1.470 63 19 ( 7 F) 8 F

/ 2 1S/2 32598.00 66 25 ( 7 F) 8 F

15/2

4/6

( 7 F)5d6s2 sp 5

/2 29982.50 2.06 51 25 ( 7F) 6P

? /2 31116.38 1.928 52 18 ( 7 F) 8G

9

/

2

32130.25 1.747 83 9 ( 7 F) 8 D

4/6( 7 F)5d6s2 8 F l /2

3

/

2

5

/2 30091.34 1.618 61 29 ( 7F) 8G

7

/

2

30783.64 1.551 50 16 ( 7 F) 8G

9

/

2

31553.76 1.522 58 28 ( 7F) 8G

“/2 32326.73 67 23 ( 7 F) 8G

13

/ 2

4/7

( 8 S°)5rf ( 9 D°)6p 2

8 D S/2 30798.06 2.14 86 or 68 ( 8S°)5d6p( 1 D°) 8 D

3

/

2

30800.71 2.80 89 or 69

7

/

2

30841.99 1.824 84 or 67

9

/

2

30901.84 1.706 81 or 67 ”/2 31014.48 79 or 70

110 9

/2, ll /2 30819.14?

4/7( 8 S°)5d ( 9 D°)6p 2

10 D 5

/2 30945.07 2.49 95 or 95 ( 8S°)5d6p(3 D°) 10D

7

/

2

31138.11 2.006 94 or 94

9

/

2

31382.61 1.860 92 or 92 “/

2

31725.93 84 or 84

18/2 32117.10 63 or 62
191

Eu I, Even Parity—Continued

Configuration Term J

Level (cm -1

) 9 Leading percentages

4/6

( 7 F)5d6s2 ep 3

/ 2

5

/ 2 31107.28 1.954 42 31 ( 7F) 8 P

7

/ 2 32681.13 1.729 56 22 ( 7 F) 8P

4/6( 7 F)5d2( 3 F) ( 9 I)6s i°I 3/2

5

/2 31203.49 0.540

7 /2 31653.48 0.97

9

/2 32224.19 1.172

ii/2

13

/2 15/2

l7

/ 2 19

/ 2 21

/ 2

4/7( 8 S°)5d ( 9 D°)6p z

8 F V2 31735.76 81 or 85 ( 8S°)5<26p(3 F°) 8 F

3

/ 2 31787.71 79 or 83

5/2 31876.09 1.719 77 or 81

7

/ 2 32003.24 1.628 73 or 77

9/2 32184.65 1.615 68 or 72 n/2 32418.38 61 or 66

is/

2 32761.74 48 or 54

4/7

( 8 S°)5d ( 9 D°)6p y

10P 7

/ 2 32398.25 2.195 95 or 95 ( 8S°)5d6p(3P°) 10P

9

/ 2 32596.31 1.93 91 or 91

1J

/ 2 32948.41 89 or 89

4/6

( 7 F)5d6s2 ?

e H? 7

/ 2 32961.85 0.857

4/6

( 7 F)5d2 6s? 7

/ 2 33245.85 1.483

4/6

( 7 F)5d6s2 ?

6 D?

3

/

5 /2 33614.42 1.479

7

/34138.16 1.495

9

/ 34738.80 1.542

4/6

( 7 F)5d2 6s? 9

/33779.50 1.48

4/7

( 8 S°)5d ( 9 D°)6p x

8 P 5

/2 33786.55 2.276 93 or 55 ( 8S°)5d6p( 3 P°) 8 P

? /2 34101.78 92 or 56

9

/34725.81 1.719 94 or 59

4/7

( 8S°)6s7p(3 P°)? i°p? 9/2? 33879.16 1.97

7

/33908.77 2.180 U/ 2

121 5

/2 33964.87? U/2 34316.97

4/6

( 7 F)5d6s2 ?

G F? V2

3

/

5

/ 34343.85 1.32

7

/ 35050.64 1.394

9

/ 36071.71 1.447 U/2

4/7

( 8S°)6s7p(3 P°)? 8 P? 9

/34366.13 1.803

S

/2 34555.82 2.27

7/2 34561.87 1.91

4/6

( 7 F)5d2 6s? i°p? 9

/34546.06 1.96

7

/36005.73 2.150

ll

/2
192

Eu I, Even Parity—Continued

Configuration Term J

Level (cm -1

) 9 Leading percentages

4/7

( 8 S°)5d ( 7 D°)6p 2

6 F "h 35453.23 91 or 91 ( 8S°)5d6p(3 F°) 6 F

9

/

2

35731.62 1.458 90 or 90

7

/

2

36081.01 1.462 90 or 90

S

/2 36284.82 1.420 93 or 93

3

/2 36501.65 97 or 97 V2 100 or 100

4/7( 8 S°)6s7p( 3 P°) ep 3

/2

7

/

2

35612.47 1.716

5

/

2

35703.65 1.89

125 3

/2 35762.12 126 3

/ 2 35799.09 127 3

/ 2,5

/2 35941.51 128 5/2 36052.65 2.202 -

130 5

/ 2,7 /2 36107.85?

131 3

/ 2 36334.52

7

/ 2 36381.51 1.841

5

/ 2 36410.96 4/7

( 8 S°)6s7p( 1 P°)? sp? 5/2 36441.77 2.224

9

/ 2 36504.56 1.793

9

/ 2 36548.83 1.810

4/7

( 8 S°)5d ( 7 D°)6p y

8 D 5/2 36584.31 1.971 85 or 67 ( 8S°)5d6p(3 D°) 8 D

3

/ 2 36586.35 2.43 90 or 71

7 /2 36700.39 1.83 80 or 64

ll

/2 36867.04 1.662 87 or 73

9

/ 2 36889.62 1.729 76 or 61

7

/ 2 36600.83 1.91

4/6

( 7 F)5d6s2 ?

6G? 3

/ 2

5

/

2

36736.26 1.103

7 /2 37152.55 1.245

9

/

2

37908.83 1.375

11/2 “/a

5

/

2

37001.69 1.297 132 11

/ 2 37034.83

133 5/2 37093.81 1.99 134 9

/

2

37126.08 1.795 135 5

/2 37266.36 2.380

7

/

2

37301.64 1.311 136 1

1

/ 2, 13

/

2

37392.64 137 5

/ 2, 7 /2 37502.49 138 7

/

2

37504.76 139 S

/ 2, 7

/

2

37574.26? 140 7

/

2

37589.41 1.61 141 9

/

2

37591.21 1.58 142 11/2 37800.42 143 7

/

2

37812.80

144 7

/

2

37851.77 1.65

9

/ 37988.09 1.389 146 7

/

2

38072.67 1.87
193

Eu I, Even Parity—Continued

Configuration Term J

Level (cm -1

) 9 Leading percentages

5

/ 2 38080.28 1.820

4/7( 8 S°)5d ( 7 D°)6p z

6 D 9

/ 2 38167.16 1.491 77 or 77 ( 8S°)5d6p(3 D°) 6 D

7

/ 2 38411.83 1.598 80 or 80

5

/ 2 38457.26 77 or 77

3

/ 2 38530.92 71 or 71

1 h 38563.98 67 or 67

147 9

/2 38262.89 1.699 148 7

/ 2? 38290.93 149 1

/ 2, 13

/ 2 38292.17 150 7

/ 2 38305.27 1.432

151 9

/ 2 38360.67 1.804 152 11

/2, 13/ 2 38534.17

4/7( 8 S°)6s ( 9S°)5/? y

10 F? 3

/ 2 38565.73

7 /2 38569.48

S

/2 38572.63

9

/2 38580.53 1.54

ii/2 38581.80

1S

/ 2 38585.65

13/2 38585.73

153 9

/ 2 38661.42

154 7

/ 2 38676.85 1.76 155 3/2? 38738.78 2.03 156 u/2 38852.45

4/7

( 8 S°)5d ( 7 D°)6p y

6P7 /2 38917.74 1.796 84 or 84 ( 8S°)5d6p(3 P°) 6P

5

/2 39022.47 2.07 90 or 90

3

/ 2 39151.69* 97 or 97

4/7

( 8 S°)6s ( 9 S°)8p? 8p 7

/ 2 9

/ 2 38975.14 1.754

5

/ 2 39179.37 2.07

9

/ 2 39015.09 1.42

4/7( 8 S°)5d ( 7 D°)6p ySF ll/2 39040.31 79 or 83 (^/SdepOF0

) 8 F

9

/ 2 39051.76 75 or 78

7

/ 2 39059.70 70 or 73

13

/ 2 39063.29 80 or 85

5

/ 2 39085.78* 63 or 66

3

/ 2 39129.32* 57 or 61 V» 39132.10 54 or 57

7

/ 2 39126.90

5

/ 2? 39136.89

9

/ 2 39192.10 1.70

4/7

( 8 S°)6s ( 9 S°)8p iop 7

/ 2 39203.83 2.16

9

/ 2 39256.45 1.95

ll/ 2

3

/ 2 39278.83 158 U/2, l 3/2 39291.36

7

/ 2 39328.30 1.80

5

/2 39611.35 1.592

5 /2? 39770.72 1.99

9

/ 2 39782.62 1.639
194

Eu I, Even Parity—Continued

Configuration Term J

Level (cm -1

) g Leading percentages

159 5

/

2

40073.57 2.305

4/7( 8 S°)6s ( 7 S°)5/? y

6 F? ll/2 40198.00

9

/

2

40200.43

7

/ 2 40201.14

3

/2 40203.37

5

/2 40203.68 V2 40206.71

4/7( 8S°)6s ( 7 S°)5/? x

8 F? V2 40217.90

3 /2 40223.66 u/2 40236.14

7

/

2

40236.64

5/2 40237.35

13 /2 40244.66

9

/

2

40249.68

160 9

/2, 11 /2 40302.07 4/7

( 6 I°)6s6p? 7

/

2

40323.65 1.042

9

/

2

40372.61 1.58

7

/ 40373.63 1.436

4/7( 8 S°)6s ( 7 S°)8p? 8 P 9

/

2

40455.51 1.768

7

/ 40609.30 1.89

5

/ 40629.82 2.264

7

/ 40493.09 1.529

5

/2 40792.43 1.605

161 9

/2, 11 /2 40838.66 4/7

( 6 I°)6s6p? 9

/

2

40843.16 1.013

4/7( 8 S°)6s ( 7 S°)8p 6P 3

/

2

7 /2 40862.41 1.692

5

/2 40939.36 1.88

9

/

2

40962.39 1.64

162 ll/ 2, l3 /2 41054.83?

5

/2 41078.38 1.149

4/7

( 8 S°)6s ( 9 S°)6/? x

10 F? 15/2 41152.12

3

/

2

41166.02

5

/2 41167.14

7

/

2

41169.20

9

/ 41171.00

11/2 41176.73

18/2 41184.12

7/2 41223.58 1.708

3

/ 2,7/ 2,9

/

2

41246.25

5

/2,7/2,9

/2 41247.86

6/7( 8 S°)6s ( 9 S°)9p 8 P

5

/2 41283.00 2.256

7

/

2

9

/ 41285.58 1.762

7

/

2

41335.67 1.775

S

/2 41408.47 1.609

5/2 41497.75 1.357

4/7( 8 S°)6s ( 9S°)9p iop 7

/

2

41515.52 2.210

9

/ 41540.43 1.97

11/2
195

Eu I, Even Parity—Continued

Configuration Term J

Level (cm 1

) 9 Leading percentages

7/2 41590.46 1.537

9

/2 41620.68 0.95

9

/2 41635.08 1.608

7

/

41692.92 1.466

5

/2 41750.07 0.918

9

/

41841.47 1.637

7

/ 41895.92 1.391

5

/2 41909.69 1.692

4/7( 8 S°)5d ( 7 D°)6p ap 9/42010.25 1.771 81 or 53 (aS^depOP0

) 8P

7

/

42087.02 1.86 79 or 52

5

/2 42130.72 2.04 90 or 55

9

/42048.40 1.596

5

/2 42139.06 1.4

7 /2 42147.42 1.642

7

/

42261.30 1.583

5

/2 42325.67 1.463 4/7

( 6 I°)6s6p? 9

/

42364.85 1.232

5

/2 42394.46 1.74 4/7

(6 I°)6s6p? 9/2 42403.68 0.867

S/2? 42491.77 1.15

9

/42499.72 1.657

9/2 42679.78 1.517

4/7

( 8 S°)6s ( 9 S°)10p iop 7

/ 2 42787.00 2.210

9

/ 2 42801.24 2.00 “/

7

/ 2 42885.69 1.88

5

/2, 7

/2,9

/2 42923.70 1.88 4/7

( 8S°)6s ( 9 S°)10p 8 P 9

/

42928.91 1.755

5

/2, 7/2,9

/2 42945.76 1.895

5/2 42958.67 1.569

9

/

42976.60 1.518

5

/2 43074.75 1.645

9

/ 2 43161.59 1.328

4/7

( 8 S°)6s ( 7 S°)9p 8 P 3/2

? /2 43168.06 1.619

5

/ 2 43228.62 1.84

7

/43226.63 1.620

7

/ 2 43283.39 1.608

4/7

( 8 S°)6s ( 7 S°)9p sp S

/2 43301.51 2.210

7

/ 2 9

/ 2? 43330.23 1.787

9

/ 2 43327.82 1.591

5

/2, 7/2,9

/2 43361.03 2.05

9

/ 2 43372.31 1.15

1 9

/ 2 43380.42 1.15
196

Eu I, Even Parity—Continued Eu I, Even Parity—Continued

Configuration Term J

Level (cm 1 ) 9 Configuration Term J

Level (cm' 1 ) 9

7

/

2

43392.16 1.633

9

/

2

44561.58 1.493

5

/2, 7

/2,9

/2 43428.78

5

/2 44594.46 1.67

5

/2, 7 /2 9

/ 2 44599.50 2.0

b

/ 2, 7

/ 2, 9/

2

43438.19 1.502

5

/ 2, 7

/ 2, 9

/ 2 44604.24 1.71

9

/2 43479.74 1.253

5

/ 2, 7

/ 2, 9

/ 2 44614.11 4/7

( 8 S°)6s ( 9 S4)llp 7 /2 43559.52 2.203

7

/ 2 44644.09 1.87

4/"7

( 8 S°)6s ( 9 SS)llp 9

/2 43567.76 2.0

7 /2 44654.31 1.662

S

/ 2 43603.59 0.715 4/7

( 8 S°)6s ( 9 SS)14p 9

/2 44659.84 2.0 4/7

( 8 S°)6s ( 9 SS)llp 5

/ 2, 7

/ 2, 9

/ 2 43634.86

4/ '( 8 S")6s ( 9S4)14p 9

/2 44671.42 1.786 4/7

( 8 S°)6s ( 9 SS)llp 5

/ 2 , 7 /2 9/ 2 43637.11 4/7

( 8 S°)6s ( 9 S4>14p S

/2 44698.5 2.20

5

/2 43673.46 1.794

9

/2 44698.5 1.372

? /2 43703.57 1.359

5/2 44723.05 1.92

S

/2 43739.50 1.652

7

/

2

44735.16 1.81

9

/2 43751.97 1.321

9

/

2

44749.99 1.50

7 /2 43840.86 1.353

7

/

2

44783.74 1.71

7 /2 43889.05 1.632

5

/2, 7/2,9/ 2 44793.78

9

/ 2 ? 43947.66

5

/2, 7/2,9

/2 44801.58

5

/ 2, 7

/ 2, 9

/

2

43955.82

5

/2 44825.13 2.0 44035.19 1.63 4/7

( 8 S°)6s ( 9 SS)15p 5

/2,

7 /2,9

/2 44843.61

5

/ 2 44039.93 1.66 4/7

( 8 S°)6s ( 9 SS)15p? 5

/2,

7 /2,9

/2 44851.85 4/7

( 8 S°)6s ( 9 S3)12p 7

/2 44061.21 2.15

7

/

2

44876.07 1.74 4/7

( 8 S°)6s ( 9 S4)12p 9

/ 2 44070.22 1.99 4/ 7

( 8 S°)6s ( 9 S4)15p 5 /2 44887.53 2.28 4/7

( 8 S°)6s ( 9 SS)12p 7

/ 2 44080.39 1.96 4/ ; ( 8 S")6s ( a S4)15p 7 /2 44888.96 2.0

4/’ 7

( 8 S°)6s ( 9 S4)12p 5 /2 44092.10 2.18

7 /2 44922.81

®/ 2 44096.79 1.610

5

/2, 7/2,9

/ 2 44932.85

7

/ 2 44159.26 1.653

9

/

2

44934.55 1.58

9

/2 44171.58 1.616

5

/2, 7 /2 9/ 2 44964.80

S

/ 2 44199.87 1.461

5

/2, 7

/2,9

/2 44974.29 2.0

5

/ 2, 7 /2 9/ 2 44226.56 4/7

( 8 S°)6s ( 9 SS)16p? b

/ 2 //2,9

/2 44977.09

5

/ 2, 7/ 2 9/ 2 44238.08 4/7

( 8 S°)6s ( 9 S4)16p 5

/2,

7 /2 9

/ 2 44996.32 2.0

5

/2,

7 /2 9

/ 2 44239.46

9

/2 45006.82 1.612

5

/ 2, 7 /2 9/ 2 44244.47 4/7

( 8 S°)6s ( 9S3)16p 5

/2,

7 /2,9

/ 2 45012.59 2.0

S

/ 2 , 7

/ 2, 9/

2

44334.75

9

/ 2? 45025.15 1.752 44336.86 4/7

( 8 S°)6s ( 9 SS)17p? 7 /2? 45087.89

7

/ 2 44384.60 1.118 4/7

( 8 S°)6s ( 9 S3)14/? 5

/2,

7 /2,9

/ 2 45099.21 4/7

( 8 S°)6s ( 9SS)13p 9

/ 2 44411.55 2.0 4/7

( 8 S°)6s ( 9 S3)17p a

/2,

V /2,M

/2 45106.83 2.0 44424.82 4/7

( 8S°)6s ( 9SS)17p 5/ 2»7/ 2, 9

/

2

45111.10 2.0 4/7

( 8S°)6s ( 9 S3)13p 7

/ 2 44425.63 2.0

9

/2 45116.42 1.58 4/7

( 8 S°)6s ( 9 SS)13p S

/2 44427.35 2.19

5 /2? 45120.98 1.70 4/7

( 8 S°)6s ( 7 S°)10p 6 p 3

/2 5

/ 2, 7/ 2,9

/ 2 45154.80

7

/ 2 44450.86 1.744

S

/2 ? 44489.91 1.94

b

/ 2, 7

/ 2, 9

/

2

45156.32 4/7

( 8 S°)6s ( 9SS)18p? 7

/ 2? 45168.30

44503.02 1.882 4/7

( 8 S°)6s ( 9SS)18p? 9

/ 2 ? 45180.18 4/7

( 8 S°)6s ( 7 S°)10p 8P 9/2 44529.04 1.755 4/7

( 8 S°)6s ( 9SS)15/? 5/ 2,7/2, 9

/ 2 45185.63

7 /2 44576.83 2.0

5h 44590.66 2.2
197

Eu I, Even Parity—Continued Eu I, Even Parity—Continued

Configuration Term J

Level (cm -1

) g Configuration Term J

Level (cm -1

) g

4/7

( 8 S°)6s ( 9 S4)18p? 5

/ 2 ? 45187.63 4/7

( 8 S°)6s ( 9 SS)57p 5/2,7

/2,9

/ 2 45695.50 4/7

( 8 S°)6s ( 9SS)18p? 7/ 2 ? 45189.42 4/7

( 8 S°)6s ( 9 S4)58p 5/2, 7

/2,9

/2 45696.87 4/7

( 8 S°)6s ( 9SS)18p? 9

/ 2 ? 45191.23 4/7

( 8 S°)6s ( 9 SI)59p 5

/2,7

/ 2, 9

/ 2 45698.16

5

/ 2, 7/ 2, 9

/2 45258.76 4/7

( 8 S°)6s ( 9 SS)60p 5

/2,7/ 2) 9/ 2 45699.40

5

/2, 7

/ 2 , 9/ 2 45260.00 4/7

( 8 S°)6s ( 9 SS)61p 5

/2,7

/2,9/ 2 45700.57

5

/2, 7/ 2, 9/ 2 45262.44 4/7

( 8S°)6s ( 9SS)62p 5

/2,7/2,9

/2 45701.70

5

/ 2, 7/ 2, 9/ 2 45298.60

5

/2, 7/2,9

/ 2

5

/ 2, 7

/ 2, 9

/ 2

45304.93 45321.20 Eu ii ( 9SS) Limit U573U-9

5

/2, 7

/2,9

/ 2 45337.71 4/7

( 8 S°)5d ( 9 D°)7p? 8 P? 5

/ 2, 7

/2,9/ 2 45754.4a

5

/ 2, 7/ 2, 9/ 2- 45339.82 5

/2, 7/ 2)9/ 2 45975a

5

/2, 7

/2,9/ 2 45364.35 4/7

( 8 S°)5d ( 9 D°)7p? sp? 5

/2,7

/ 2 , 9

/ 2 46145a

5

/2, 7/ 2, 9/ 2 45367.53 5

/ 2, 7/ 2, 9/ 2 46346a

5

/2, 7

/ 2, 9/ 2 45403.19 5

/2, 7 /2 9/ 2 46394a

5

/2, 7

/ 2, 9

/ 2 45407.95 5

/ 2 , 7

/2,9/ 2 46539a

5

/2, 7/2,9

/ 2 45420.78 5

/2,7/ 2, 9

/2 46684a

5

/2,7/2,9

/ 2 45423.50 5

/ 2, 7

/ 2,9

/ 2 46781a

5

/2, 7/ 2, 9/ 2 45427.36 5

/ 2, 7

/ 2 , 9/ 2 46983a

5

/ 2, 7/ 2, 9

/

45447.46 5

/ 2, 7/ 2 , 9

/ 2 47088a

5

/ 2, 7

/ 2, 9/ 2

5

/ 2, 7/ 2 9

/ 2

45469.87 45471.70 4/7

( 8 S°)6s ( 7 SE)44p

5

/ 2, 7/ 2 9/ 2 47289a

5

/ 2, 7

/ 2 , 9

/ 2 47337.15

5

/ 2) 7/ 2, 9/ 2 45481.97 4/7

( 8 S°)6s ( 7 S§)45p 5

/2,7/2,9

/2 47340.29

5

/2, 7/2,9/ 2 45490.70 4/7

( 8 S°)6s ( 7 SS)46p 5

/ 2, 7

/2 9

/ 2 47343.21

5

/ 2, 7

/ 2 9/ 2 45492.79 4/7

( 8 S°)6s ( 7 SS)47p 5

/2,7

/2,9

/2 47345.98

5

/ 2, 7

/ 2, 9

/ 2 45509.92 4/7

( 8 S°)6s ( 7 S§)48p 5

/ 2 , 7/ 2 , 9

/ 2 47348.63

5

/2, 7/ 2, 9/ 2 45593.85 4/7

( 8 S°)6s ( 7 S§)49p 5

/2,7

/2,9

/ 2 47351.04

5

/2, 7/2,9/ 2 45601.92 4/7

( 8 S°)6s ( 7 S§)50p S

/ 2 , 7

/2,9

/2 47353.29

5

/ 2, 7/ 2, 9/ 2 45607.71 4/7

( 8 S°)6s ( 7 SS)51p 5

/2,7/ 2>9/ 2 47355.41

5

/2, 7/2,9/ 2 45608.95 4/7

( 8 S°)6s ( 7 S5)52p 5

/2,

7

/ 2 , 9

/ 2 47357.43 4/7

( 8 S°)6s ( 9SI)42p 5/ 2 , 7

/2,9

/ 2 45658.74 4/7

( 8 S°)6s ( 7 S§)53p 5

/ 2 , 7

/2,9/ 2 47359.29 4/7

( 8 S°)6s ( 9 SS)43p 5/ 2, 7

/ 2 , 9

/ 2 45662.57 4/7

( 8 S°)6s ( 7 S§)54p 5

/ 2, 7

/2,9

/2 47361.02 4/7

( 8 S°)6s ( 9S2)44p 5

/ 2, 7/ 2, 9/ 2 45666.13 4/7

( 8 S°)6s ( 7 SS)55p 5

/2,7

/2,9

/ 2 47362.69 4/7

( 8 S°)6s ( 9 SS)45p 5

/2,7/2,9

/ 2 45669.43 4/7

( 8 S°)6s ( 7 SS)56p 5

/ 2, 7/ 2, 9/ 2 47364.27 4/7

( 8 S°)6s ( 9SS)46p S

/2, 7/2,9/ 2 45672.53 4/7

( 8 S°)6s ( 7 Sa)57p 5

/2,7/2,9

/2 47365.76 4/7

( 8 S°)6s ( 9 SS)47p 5/2, 7

/2,9

/ 2 45675.37 4/7

( 8 S°)6s ( 7 Sa)58p 5

/2,7/2,9/ 2 47367.15 4/7

( 8 S°)6s ( 9S4)48p 5

/2, 7/ 2, 9

/2 45678.00 4/7

( 8 S°)6s ( 7 S§)59p 5

/2, 7

/2,9/ 2 47368.49 4/7

( 8 S°)6s ( 9 SS)49p 5/ 2, 7/ 2 , 9/ 2 45680.53 4/7

( 8S°)6s ( 7 Sa)60p 5

/ 2, 7/ 2, 9

/

47369.75 4/7

( 8S°)6s ( 9SS)50p 5

/2,7/ 2, 9/ 2 45682.86 4/7

( 8 S°)6s ( 7 Sa)61p 5

/ 2)7

/ 2, 9/ 2 47370.90 4/7

( 8 S°)6s ( 9 SS)51p 5/2, 7

/ 2, 9

/2 45685.03 4/7

( 8 S°)6s ( 7 Sa)62p 5

/2,7

/2,9/ 2 47372.02 4/7

( 8 S°)6s ( 9 S4)52p 5

/2,7/2,9/ 2 45687.12 4/7

( 8 S°)6s ( 7 Sa)63p 5

/2,7/2,9/ 2 47373.10 4/7

( 8 S°)6s ( 9 SS)53p 5

/ 2, 7

/ 2 , 9/ 2 45689.05 4/7

( 8 S°)6s ( 7 Sa)64p 5

/ 2, 7/ 2, 9

/ 2 47374.10 4/7

( 8 S°)6s ( 9 SS)54p 5

/2,7/ 2, 9

/2 45690.82 4/7

( 8 S°)6s ( 7 Sa)65p 5

/2,7/2,9/ 2 47375.04 4/7

( 8 S°)6s ( 9SS)55p 5

/2,7/ 2, 9/ 2 45692.50 4/7

( 8S°)6s ( 7 S8)66p 5

/ 2» 7/2» 9

/

47375.96 4/7

( 8 S°)6s ( 9 SS)56p 5

/2,7/ 2, 9/ 2 45694.05 4/7

( 8 S°)6s ( 7 Sa)67p 5

/2,7/2,9

/ 2 47376.87
198

Eu I, Even Parity—Continued Eu I, Even Parity—Continued

Configuration Term J

Level (cm -1

) 9 Configuration Term J

Level (cm -1

) 9

Eu II (’Ss) Limit U7U0U.1 5

/2, 7

/2,9

/2 51274a

S

/2, 7

/2,9

/2 47483a 5

/2, 7/2,9/2 51556a

5

/2,7

/2,9

/2 48241a *V 2, 7

/ 2, 9

/

2

51806a

5

/2,7

/2,9/2 48490a 5

/2, 7

/2,9

/2 52185a

5

/ 2, 7

/ 2,9/

2

49860a 5

/2,7

/2,9

/2 52572

a

5

/2, 7

/2,9

/2 50040a 5

/2, 7

/2,9

/2 53000a

5

/2, 7/2,9

/2 50435a 5

/2, 7

/2,9

/2 53355a

5

/2, 7

/2,9

/ 2 50935a 5

/2, 7

/2,9

/2 53887a

5

/2, 7/2,9

/2 51137a 5

/2, 7

/2,9

/2 54073a
199

Eu II

(Sm I sequence; 62 electrons) Z=63

Ground state (ls 2 2s 2 2p fi 3s 2 3p6 3d 10 4s 2 4pfi 4<i 10 5s 2 5p6

) 4/ 7 6s 9 S°

Ionization energy 90665± 50 cm"1 11.241± 0.006 eV

Identified odd configurations 4/ 7 6s, 4/ 7 5d, 4/ 7 7s, 4/ fi 5d6p?, 4/ 7 6d, 4/ 7 8s

Identified even configurations 4/ 7 6p, 4/ fi 5c?6s, 4/ 6 5d2

, 4/ M ?

Albertson’s 1934 note on this spectrum gave all the levels of 4/ 7

( 8 S°)6s, (

8 S°)6p, and

( 8 S°)7s, as well as the 4/ 7( 8 S°)5c?

9 D° levels. His discovery that the Eu ii ground configuration

has a single external (6s) electron led to the conclusions that the Eu hi ground configuration

would have no such electrons (4/

7 ground configuration) and that the normal Eu I configuration would probably be 4/ 7 6s 2

. Albertson’s prediction for Eu i was confirmed later in the same year by Russell and King [1934, see Eu i ]; these results were the first experimental

contradiction of the previous usual view that all neutral rare-earth atoms had ground

configurations of the type 4/'v 5d6s 2

. The levels and LS-coupling designations are from the 1941 extension of the analysis by

Russell, Albertson, and Davis. This analysis was based on 1861 lines (2109-10165 A) definitely

assigned to Eu n by A. S. King [1939] and on extensive Zeeman-effect data. All of the

strongest lines are classified by transitions between levels based on the 4/ 7

( 8 S°) parent term;

the 156 known levels classify a total of 467 lines. If all lines in King’s list that probably belong

to Eu II are included, more than 2200 lines remain unclassified. Russell et al. note that most of

these lines must involve levels based on higher terms of 4/ 7

. The 4/ 7

( 8 S°)5d levels have high purity in the LS-coupling scheme, as shown by the

percentages taken from the calculation of Eremin and Maryakhina. The 4/ 7

( 8 S°)6p levels have

been assigned J x j names by analogy with this configuration in Gd in; Callahan remarked that

the corresponding levels of 4/ 7

( 8 S°)6p in Eu n and Gd hi fall very near each other on the LSto-J x j coupling diagram. The two pairs of levels having the same J value (/=4 and .7=3) have

significantly mixed compositions in the LS scheme; the percentages are from Bordarier, Judd,

and Klapisch, as quoted by Guthohrlein.

The two 4/ 7 (

8 S°)6s levels have high purity in either LS or J x j coupling, since the ( 8 S°)

parent has high LS purity (see Eu i). In a single-configuration pure-coupling approximation

the 6s —6p lines are therefore probably best regarded as transitions from levels of the J x j

terms ( 8 S°/2 )6p 1/2 and ( 8 S°/2 )6p 3/2 to the two ( 8 S°/2 )6

1/2 levels. Analysis of the hyperfine

structure of four of these lines (3819-4523 A) by Guthohrlein and by Guthohrlein, Himmel, and

Steudel shows the (

8 S7,»)6p levels to be perturbed, probably due to interaction with

4/ 6

( 7 F)5d6s levels. In cases where Russell et al. assigned both a numerical and a (tentative) term designation

to a level, we give here the numerical name; these were used in the list of line classifications. The even levels that were given as belonging to one of three terms 2

7 D, x

7 P, or y9 D are

listed here (in order of position) with tentative designations. The LS assignments are strongly

indicated by the observed g values, but until the analysis is further developed the term

groupings appear uncertain. The higher even levels probably belong mainly to 4/ fi 5d6s and

4/ 6 5d2

, but the irregular 2

7 F term (—56000 cm' 1 ) is tentatively assigned to 4/ 8

. (This term is called 2

7 F in the text and in tables II and V of Russell et al., but is given as x7 F in tables

VIII and XII.) Russell et al. state that this configuration is more probable than 4/ 6 5d2 “on account of the isolation and great strength of the [a 7 D°—2

7 F] multiplet,” and the resulting

position of 4/ 8 is reasonable. If the level identifications are correct, the term is perturbed,

since the levels should lie in the regular order for an inverted term.

Russell et al. assigned the x

9 P and y7 P terms to 4/ 6

(

7 F)5d2

, the y

7 P assignment being

tentative. Koniordos and Winkler have observed that the hyperfine structure of the a

7 S :! —

y

7 P 2 transition does not support the 4/ fi 5d 2 assignment for the y

7 P., level.
200 Eu II —Continued

The grouping of a few of the high odd levels into the e

7 F° and f1 D° terms is tentatively

retained here. According to Russell et al., these terms belong to the (4/ 6 6s6p+4/6 5d6p) group,

with the latter configuration being more probable.

The g values are based on Zeeman patterns obtained at MIT with a field of 8.785 teslas

(87850 gauss). Russell et al. give the patterns for 460 lines, including “all the stronger lines and

a great number of faint ones” (2317-7426 A). If the g value of a particular level is one of two

possible values, both values are listed with question marks. A colon following a g value

indicates that it is “doubtful.” The probable error of the g values ranges from about 0.001

(a a

7 S°,) to 0.006. Wybourne pointed out that an apparent failure of the <7 ~sum rule for the

low terms discussed by Russell et al. could be explained by the deviation of the g value of the

Eu in 4f

1 8 S°/2 limit level (measured value 1.985) from the theoretical LS-coupling value

(2.002). A more accurate g value for the 4/ 7 x S°/2 level is probably obtained by taking it equal

to the accurately measured value for the Eu I 4/ 7 6s 2 8 S°/2 level (1.9934). This value would

account for about half of the p-sum discrepancy noted by Russell et al., and the remaining

discrepancy (if real) could well be due to a small error in the original field calibration, as discussed by them.

A fit of the ( 8 S°)6s,7s,8s, 9 S4 series to the Ritz formula, as was done by Russell et al., yields a value of 90713 cm' for the Eu ill 4/ 7

( 8 S°/2 ) limit. We have adjusted this value downward by

48 cm

-1

, the correction being derived from data on the systematic behavior of ns series

[Reader, 1973]. The uncertainty is conservatively taken as equal to the correction, although the

consistency of the systematic behavior would indicate a considerably smaller error. The identification of Eu n in the spectrum of the A-type star a

2 Canum Venaticorum more than 60 years ago was one of the first indications of the peculiarity of the spectra of

many stars of this type. It is now known that the light rare-earth elements are greatly

overabundant (relative to the solar abundances) in the atmospheres of many “peculiar” A

stars. The study of these puzzling objects furnishes one of the best examples of the need for more complete data on rare-earth spectra and energy levels.

References

Albertson, W., Phys. Rev. 45, 499 (1934). EL CL

Bordarier, Y., Judd, B. R., and Klapiseh, M., unpublished results quoted by G. Guthohrlein (1968). Hfs PT

Callahan, W. R., J. Opt. Soc. Am. 53, 695 (1963). PT

Eremin, M. V., and Maryakhina, O. I., Opt. Spectrosc. (USSR) 26, 479 (1969). PT

Guthohrlein, G., Z. Phys. 214, 332 (1968). Hfs IS PT

Guthohrlein, G., Himmel, G., and Steudel, A., J. Phys. (Paris) Colloq. C 1 30, 66 (1969). Hfs

King, A. S„ Astrophys. J. 72, 221 (1930). W Hfs

King, A. S., Astrophys. J. 89, 377 (1939). W

Koniordos, I., and Winkler, R., Phys. Lett. 27A, 198 (1968). IS Reader, J., private communication (1973). IP

Russell, H. N., Albertson, W., and Davis, D. N., Phys. Rev. 60, 641 (1941). EL CL ZE IP Wybourne, B. G., J. Opt. Soc. Am. 54, 267 (1964). PT

[July 1976]
201

Eu II

Configuration Term J

Level (cm -1

)

!

'

9 Leading percentages

4/7( 8 S°)6s a

9 S° 4 0.00 1.984 or ( 8S7/2)6sl/2

4/7( 8S°)6s a

7 S° 3 1669321 1.981 or ( 8S7/2)6Sl/2

4/7

( 8 S°)5d a

9 D° 2 9923.00 2.641 100 3 10081.65 2.062 100 4 10312.82 1.842 99 i ( 8S°) 7 D°

5 10633.38 1.726 99 i ( 8 S°) 7 D°

6 11128322 1.659 100

4/7( 8 S°)5d a

7 D° 5 16860.72 1.592 99 i ( 8S°) 9 D°

4 17003.06 1.628 99 i ( 8S°) 9 D°

3 17130.87 1.728 100 2 17237.67 1.981 100

1 1 7323.66 2.972 100

4/7( 8 S?/2 )6pi/2 ( 7 /2,>/2) 3 23774.28 2.195 or 87 ( 8 S°) 2

9 P

4 24207.86 1.877 or 63

4/7( 8 S7/2)6p3/2 ( 7

/2,3 /2) 5 26172.83 1.789 or 100 ( 8 S°) 2

9P

4 26838.50 1.801 or 63 ( 8S°) 2

7 P

3 27104.07 1.943 or 87 ( 8S°) 2

7 P

2 27256.35 2.312 or 100 ( 8S°) 2

7 P

4/6

( 7 F)5d ( 8 D)6s 2

9 D 2 30189.31 2.511 3 31500.82 2.002

4 32486.10 1.824 5 33420.20 1.710 6 34764.97 1.687

101 4 33779.95 1.565

102 3 33919.70 1.681

103 2 33944.49 1.690

4/6( 7 F)5d ( 8 P)6s y

9 P 3 34393.57 2.037

4 35527.02 1.898 5 36648.95 1.749

104 3 34546.10 1.307

105 4 34617.73 1.603

106 3 34923.43 1.669

107 4 35045.98 1.966

108 3 35440.88 2.004

109 3 35567.74 1.434

2

7 D? 12 35846.96 1.931 4 37010.70 1.702 3 37167.90 1.733 5

110 4 35935.81 1.591

111 4 36428.89 1.472

4/6( 7 F)5d2

( 3 F) x

9P 3 36628.00 2.163 4 37223.78 1.892 5 37849.34 1.715

112 3 36821.20 1.428

113 4 36954.00 1.463

225-298 0 - 78-14
202

Eu II—Continued Eu II—Continued

Configuration Term J

Level (cm -1

) 9 Configuration Term J

Level (cm -1

) 9

114 5 37000.00 1.578 141 4,5 43461.07 115 2 37003.23 2.151 142 5 43643.12 1.645:

4/6

( 7 F)5d2 ? y

7 P 2 37336.83 2.196 143 5 44947.15

3 38804.98 1.916 4 39134.72 1.746 144 4 46032.03 1.418:

116 6 37583.63 1.775 145 4 46584.45

117 3 37605.51 1.735 146 2 48171.51 1.455

118 3,4 37622.87 147 1,2 48180.68

119 2 37799.89 1.744 148 5 48378.03 (1.748?

1 1.428? 120 5 37932.19 1.460 149 2 48522.28

121 4 37993.64 1.322 150 3 48536.61 1.576 122 4 38058.03 1.436 151 4 48872.85 x

7 P? 2 38146.44 2.364 3 38463.66 1.716 152 3 48910.95

4 39554.43 1.694 153 4,5 49003.10 123 3 38295.89 1.703 154 2 49043.00 1.319 124 1 38582.08 3.155 4/7

( 8 S°)7s e

9S° 4 49128.03 1.985 125 7 38725.32 1.576: 155 2 49254.68 1.558 126 5 38784.47 1.601 156 3 49480.46 127 4 38995.52 1.566 4/7

( 8 S°)7s e

7 S° 3 49646.62 1.974 128 2 39099.43 2.016 157 2 49720.89 129 6 39601.80 1.756 158 1 50947.46 2.874 130 3 39767.55 r 1.750? 12.374? 4/6 5c£6p? e

7 F° 6

5 5296340 1.526 131 6 40316.92 1.632 4 53150.3k 1.552 3 53k90.kk 1.525 132 4 40870.72 1.892 2 538612,6 1.563

133 6 41099.11

10

134 5 41223.24 1.661 1° 4 53783.01 1.875:

135 4 41438.13 1.694: 4/7

( 8S°)6d e

9 D° 2 51273.98 2.620: 136 4 41666.81 1.505 3 5k320.69 1.912 4 54380.30 1.807 137 4 41714.84 5 5448427 1.507 6 54565.04 1.655 138 2 42391.03 1.935 4/7

( 8 S°)6d e

7 D° 4 54295.02 y

9 D? 2 42438.56 5 54428.76 1.414 3 43193.46 1.987 1 54435.41 2.852 4 44075.84 1.672 2 54490.63

5 45126.78 1.602 3 54589.10

6 46029.14 1.621 2° 3,4 54600.07 139 4 42710.14

3° 3 55156.18 140 3,4 42939.45
203

I Eu FI —Continued Eu II

Continued

Configuration Term J

Level (cm -1

! 9 Configuration Term J Level (cm -1

) 9

4° 3 55193.08 11° 3,4 57360.05

5° 3 55559.02 162 1,2 57363.68

4/8? 2

7 F 6 55651.82 1.490 163 3 57388.87 1.736: 3 55967.88 1.460 0 55986.45 164 2,3 57415.06

5 55991.33 1.460 4 56067.39 1.466 165 3,4 57634.02

1 56245.61 1.494 2 56571.04 1.451 166 2 58920.64 1.502

159 2 55693.94 1.115 12° 3 59045.49 2.061

160 2 55807.25 1.090 167 1 59145.26 1.486

6° 3,4 56158.66 168 2 59334.70

161 3 56229.17 1.381 169 4,5 59343.45

/

7 D°? 5 5627HO 1.662

0

CO

pH 3 59765.77

4 56293.33 1.649: 3 5630921 170 3,4 59995.34

1 56310.89 2.962 2 5632127 1.792 4/7

( 8 S°)8s /

9S° 4 66598.00

7° 2,3 56421-62 1.844 4/7

( 8S°)8s f

1 s° 3 66836.167

8° 5 5678120 1.454

9° 3,4 5712726 EU III ( 8S7/2) Limit 90665

10° 4 57270.14
204

Eu III

(Pm i sequence; 61 electrons) Z=63

Ground state (ls 2 2s 2 2p6 3s2 3p6 3d 10 4s2 4p6 4d 10 5s2 5p6

) 4f

1 8 S

/2

Ionization energy 201000± 800 cm 1 24.92± 0.10 eV

Sugar and Spector [1974] list almost 900 lines for this spectrum in the range 2026-8582 A,

with all but 22 of the lines lying below 3360 A. The 105 levels obtained from their analysis,

given here, classify about 300 of the observed lines. The leading percentages for all levels except the ground level are also from Sugar and

Spector [1974, 1975], They calculated 4/ fi (

7 F)6p with matrices truncated to include only terms

based on the 7 F core term, using the “real core” approximation. The 1974 paper gives the first two percentages for each level in the J x j coupling scheme most appropriate for this configuration; we have omitted the second Jx j percentages, and listed instead the leading

percentages in LS coupling [Sugar and Spector, 1975],

The calculation of (4/

fi 5c?+4/ 6 6s) was expanded to include terms based on the three 5 D

terms of 4/ fi

, but still more complete matrices apparently are needed to fit the observed levels,

g values, and intensities more accurately [Sugar and Spector, 1974]. The intensities of the

transitions to the ground level indicate that the level having J= 5/

2

at 39769 cm

-1 has a larger

4/ fi ( 7 F)5e? 8 P component than the level at 40897 cm' 1

, contrary to the results of the 1974

calculation. We have thus followed Sugar and Spector in retaining the original 8 P designation

for the lower of these levels [Martin and Sugar, 1973].

Baker and Williams obtained a g value of 1.9926±0.0003 for the 4/ 7 8 S°/2 ground level by

fitting their electron paramagnetic resonance data for Eu2+ ions (calcium fluoride host). An

assumption that the observed g value is due to a mixture of 8 S°/2 and fi P°/2 wavefunctions (see

Eu 1 ) gives a

fi P°/2 percentage of 2.9±0.1% in the eigenvector for the ground level [Baker and

Williams, 1962], The g values for six upper levels are from Russell, Albertson, and Davis

[1941], with some corrections noted by Martin and Sugar.

The ionization potential is from Sugar and Spector, who were able to improve the

accuracy of the value obtained earlier by Sugar and Reader [1973].

References

Baker, J. M., and Williams, F. I. B., Proc. R. Soc. London, Ser. A 267, 283 (1962). ZE Hfs

Martin, W. C., and Sugar, J., Astrophys. J. 184, 671 (1973). EL ND CL ZE PT

Russell, H. N., Albertson, W., and Davis, D. N., Phys. Rev. 60, 641 (1941). EL CL ZE

Sugar, J., and Reader, J., J. Chem. Phys. 59, 2083 (1973). IP

Sugar, J., and Spector, N., J. Opt. Soc. Am. 64, 1484 (1974). EL ND CL W IP PT

Sugar, J., and Spector, N., unpublished material (1975). PT

[July 1976]
205

Eu in

Configuration Term 1 J

Level (cm" 1 ) 9 Leading percentages

4/7 8 S° 7 / 2 0.00 1.9926 97 3 6p° 4P 6 P° 7 /2 28200.06 5/2 28628.51* 3/2

4/7 e r 7 / 2 31 71*5.99 9/ 2 31951*21

17 / 2 32073.30 u/2 32179.55

15/2 32307.78

13/2 323U.11*

4/6( 7 F)5d 8 H 3

/2 33856.22 97 2 ( 5 D1) 6G 5

/2 34394.41 97 1 ( 5 D1) eG ? /2 35108.86 97 1 ( 5 D1) 6G 9/2 35972.13 98 1 ( 5 D1) 6G

n/2 36962.29 99 1 ( 7F) 6 H

13/2 38067.33 99 1 ( 7F) 6 H

15 / 2 39289.69 99 1 ( 7 F) 6 H

11/2 40659.41 100

4/6( 7 F)5d 8 D 3 / 2 35627.36 56 38 ( 7 F) 6 P 5 /2 74 19 ( 7 F) 6P 7 / 2 38229.07 90 4 ( 7 F) 6P 9

/2 39225.71 95 3 ( 7 F) 8 F

n/2 40133.12 97 1 ( 7 F) 6F

4/6( 7 F)5d 8 G

V2 38050.11 65 27 ( 7 F) 8 F 3 h 38316.66 61 30 ( 7 F) 8 F 5 1 2 38828.56 61 29 ( 7 F) 8 F 7 / 2 39579.66 63 29 ( 7 F) 8 F 9 / 2 40518.43 67 28 ( 7 F) 8F

n/2 41573.22 72 25 ( 7 F) 8 F

lS/ 2 42658.20 79 17 ( 7F) 8 F

lS / 2 43658.96 93 7 ( 7 F) 6 H

4/6 ( 7 F)5d 8 F 1 h 65 28 ( 7 F) 8G 3

/2 39014.36 61 33 S

/2 39636.88 1.592 52 20 7 /2 40371.65 59 33 9 / 2 41159.52 66 30 U/ 2 41987.90 71 26

18/2 42850.07 80 17

4/6 ( 7 F)5rf 8 P 8/ 

39769.05 2.025 39 23 ( 7F) 6P 7 / 2 40870.60 1.885 69 25 ( 7 F) 6P 9 / 2 42084.25 1.762 97 2 ( 7 F) 6 D

4/e( 7 F)5d 5

/2 40897.66 2.027 45 8P 39 ( 7 F) 6 P

4/6 ( 7 F)5d 8 P 8/2 55 41 ( 7F) 8 D 7 / 2 42530.91 1.860 64 27 ( 7 F) 8P

4/6 ( 7 F)5d 6 H 8/2 43395.75 95 2 ( 5D1) 4 G ? /2 43885.27 95 2 ( 7 F) 6G 9 / 

44553.80 94 3 ( 7 F) 6G

u/2 45313.75 95 3 ( 7 F) 6G

13 / 2 46150.85 94 3 ( 7 F) 8G

15/2 47069.87 92 7 ( 7 F) 8G

4/6( 7 F)6s 8 F

V2 46096.40 92 2 ( 5 D1) 6 D

8/2 46519.26 94 2 ( 5 D1) 6 D

8/2 47173.34 94 2 ( 7 F) e F 7 / 

47993.76 95 2 ( 7 F) 6 F 9

/2 48925.15 96 2 ( 7 F) 6 F

“/2 49925.96 98 1 ( 7 F)5d 8 F

13/2 50965.29 98 1 ( 7F)5d 6G
206

Eu III —Continued

Configuration Term J

Level (cm -1

) 9 Leading percentages

4/6

( 7 F)5d 6 F l h 55 35 ( 7 F) 6 D

3

1 2 47 39 ( 7 F) 6 D

S

/2 46108.79 54 31 ( 7 F) 6 D

7

/ 2 46793.38 59 25 ( 7F) 6 D

9

/2 47714.74 64 21 ( 7 F) e D

xx/2 49086.13 81 15 ( 7 F) 6G

4/6( 7 F)6s 6 F V2 48259.62 93 2 ( 7F)5d 6 F

3

/ 2 48828.91 87 8 ( 7 F)5d 6G

5

/2 49610.81 78 15 ( 7 F)5d 6G

7

/

2

50805.58 54 27 ( 7 F)5d 6G

9

/2 51848.18 91 4 ( 7F)5d 6G

n/2 52960.08 97 1 ( 7 F) 8 F

4/6( 7 F)5d 6 D V2 54 33 ( 7 F) 6F

3

/

2

49 35 ( 7 F) 6 F

5 /2 48496.43 54 21 ( 7F) 6 F

7

/ 2 49292.56 57 24 ( 7 F) 6G

9

/ 2 49956.73 63 23 ( 7 F) 6G

4/e

( 7 F)5d 6G 3

/ 2 78 10 ( 7 F) 6 F

5

/ 2 49905.64 58 18 ( 7 F)6s 6 F

9

/ 2 59 21 ( 7 F) 6 F

1X

/

2

51650.77 80 15 ( 7 F) 6 F

13/2 52099.87 95 2 ( 7 F) 8 F

4/6

( 7 F)6s 7 /2 50426.33 42 eF 37 ( 7 F)5d 6G

4/6( 7 Fo)6pi/2 ((V/2)

0 V2 78981.86 69 or 88 ( 7 F) 8G°

4/6

( 7 F i)6pi/2 a,

l h)° 3

/

2

7943 7.1

8

80 or 84 ( 7 F) 8G°

V2 79639.31 72 or 56 ( 7 F) e D°

4/e

( 7 F2 )6pi/2 (2,

1 /2

)° 5

/

2

8015347 85 or 81 ( 7F) 8G°

3

/

2

80253.58 83 or 48 ( 7 F) 6 D°

4/6( 7 F3 )6pi/2 (3

,

1 /2

)° 7

/

2

8105949 87 or 77 ( 7 F) 8G°

5

/

2

8106748 87 or 38 ( 7 F) 6 D°

4/6

( 7 F4 )6pi/2 (4,

1 /2)° 7

/

2

81985.13 89 or 42 ( 7 F) 8 D°

9

/

2

82101.85 89 or 70 ( 7 F) 8G°

4/6( 7 Fs)6pi/2 (V/a)" 9

/

2

82954.63 90 or 60 ( 7 F) 8 D°

11/2 8324849 91 or 58 ( 7 F) 8G°

4/6( 7 F i)6p3/2 (l,3 /2)° 3

/

2

83009.54 44 or 82 ( 7F) 8 D°

5

/ 2 83776.98 55 or 55 ( 7 F) 8 D°

l h 84563.08 68 or 56 ( 7 F) 8F°

4/e( 7 F6)6pi/2 (6,V2)° n/2 83959.93 91 or 79 ( 7 F) 8 D°

1 3

/ 2 84486.76 95 or 41 ( 7 F) 6G°

4/6( 7 Fo)6p3/2 (0,

3

/ 2

)° 3

/2 84510.34 54 or 67 ( 7 F) 6G°

4/6

( 7 F2 )6p3/2 (2

,

3

/ 2

)° 7

/ 2 84640.56 79 or 53 ( 7F) 8 F°

5

/ 2 84938.40 52 or 62 ( 7 F) 6G°

3

/ 2 61 or 35 ( 7 F) 8 F°

V2 67 or 85 ( 7 F) 6 F°

4/6

( 7 F3 )6p3/2 (3,

3

/ 2

)° 9

/ 2 85479.93 91 or 47 ( 7 F) 8 F°

7

/ 2 85705.11 75 or 54 ( 7 F) 6G°

5

/ 2 8592849 60 or 37 ( 7F) 6D°

3 /2 86933.53 72 or 76 ( 7 F) 6 F°

4/6( 7 F4)6p3/2 (4,

3 /2)° u/2 86282.06 93 or 38 ( 7 F) 8G°

9

/ 2 86760.09 90 or 46 ( 7 F) 6G°

7

/

2

86944-83 58 or 45 ( 7F) 6 D°

5

/

2

87820.98 71 or 72 ( 7 F) 6 F°
207

Eu III —Continued

Configuration Term J

Level (cm -1

) 9 Leading percentages

4/6( 7 F5)6p3/2 (5

3

/ 2

)° 13/2 87041.33 95 or 61 ( 7F) 8G°

ll/ 2 87959.80 97 or 47 ( 7F) 8F°

9

/2 88166.46 53 or 55 ( 7 F) 6D°

7/2 88753.45 67 or 68 ( 7 F) 6 F°

4/6( 7 F6 )6p3,2 (6,

3

/ 2

)° 15/2 87710.15 100 or 100 ( 7 F) 8G°

13/2 89178.53 100 or 59 ( 7 F) 8 F°

9

/

89639.1

59 or 64 ( 7 F) 6F°

lx

/ 2 90155.04 92 or 81 ( 7 F) 6 F°

Eu iv ( 7 Fo) Limit 201000
208

[Eu IV]

(Nd i sequence; 60 electrons) Z=63

Ground state (ls 2 2s 2 2p6 3s2 3p6 3d 10 4s2 4pfi 4d 10 5s2 5p6

) 4/ fi 7 F„

Ionization energy 344000± 5000 cm" 1 42.7±0.6 eV

The spectrum of the free ion has not been analyzed. The 4/ w 7 F and 5 D levels given here

are centers-of-gravity of the corresponding sublevels of the ion in hexagonal LaCl8 , rounded

off to the nearest 10 cm" 1

. DeShazer and Dieke derived the sublevels by analysis of both

absorption and fluorescence spectra. Levels for higher terms are listed by Dieke [1968] and by

Carnall, Fields, and Rajnak [1968] (to 41370 cm" 1 ). Ofelt has given the septet and quintet components of the eigenvectors for the 4/ 6 levels up to 40000 cm" 1

. The percentages here are from an unpublished calculation by Carnall et al. [1974],

Sugar and Reader derived the ionization energy. Their estimate of the uncertainty has

been doubled, as recommended by Spector and Sugar.

References

Carnall, W. T., Fields, P. R., and Rajnak, K., J. Chem. Phys. 49, 4450 (1968). [EL] [CL] [W] PT

Carnall, W. T., Fields, P. R., and Rajnak, K., unpublished material (1974). PT

DeShazer, L. G., and Dieke, G. H., J. Chem. Phys. 38, 2190 (1963). [EL] [CL] [W] [ZE] PT

Dieke, G. H., Spectra and Energy Levels of Rare Earth Ions in Crystals, Ed. H. M. Crosswhite and H. Crosswhite, pp. 242-249 (Interscience Publishers, New York, 1968). [EL] [CL] [W] [ZE]

Ofelt, G. S., J. Chem. Phys. 38, 2171 (1963). PT

Spector, N., and Sugar, J., J. Opt. Soc. Am. 66, 436 (1976). Sugar, J., and Reader, J., J. Chem. Phys. 59, 2083 (1973). IP

[July 1976]

[Eu iv]

Configuration Term J

Level

(cm -1

) Leading percentages

4/6 7 F 0 0 93 3

5 D1

1 [370] 95 3

5 D1

2 [1040] 96 2

5 D1

3 [1890] 97 1 5D1

4 [2860] 98 1 5F2

5 [3910] 98 1 5G1

6 [4940] 96 2

5G1

4/6 5 D3 0 [17270] 46 30 5 D1

1 [19030] 51 32 2 [21510] 55 35 3 [24390] 56 36 4 [27640] 53 36

Eu V ( 6 Hs/2 ) Limit 3U000
GADOLINIUM

Gd I

64 electrons Z=64

Ground state (ls 2 2s 2 2p6 3s 2 3p fi 3(i

in 4s 2 4p6 4<i10 5s 2 5pfi ) 4/ 7 5d6s2 9 D2

Ionization energy 49603±5 cm-1 6.1500±0.0006 eV

Identified odd configurations 4/ 7 5d6s 2

, 4/ 7 5d2 6s, 4/ 7 5d'\ 4/ 7 5d6s7s, 4/ 7 5e?6s8s, 4/ 7 6s2 7s, 4/ 7 6s6p2

, 4/ 8 6s6p

Identified even configurations 4/ 8 6s 2

, 4/ 8 5d6s, 4/ 8 6s7s, 4/ 7 6s 2 6p, 4/ 7 5d6s6p, 4/ 7 5d2 6p

Spectrum Observations

King [1943] gave wavelengths and temperature classifications for 5775 Gd lines in the

range 2135-10667 A. By comparing intensities in the spectra from the furnace, an arc, and a spark, he separated the lines of Gd I and Gd n. A much richer spectrum has been obtained

from an electrodeless lamp containing 158 Gd. P. E. Noorman photographed the spectrum from

this source with the 9-m spectrograph at the Argonne National Laboratory. The measurements

of these plates by Hoekstra and Slooten [1971] gave more than 18500 Gd lines in the range

2468-8752 A, about 11000 of which belong to Gd I. Also at Argonne, Tomkins and Camus have

observed 850 Gd I lines in absorption in the region 2200-2800 A. The new lists are unpublished, but van Kleef, Blaise and Wyart [1971] used them in their analysis, and some

5300 Gd I lines are now classified. Practically all of the 1400 strongest Gd I and Gd ii lines are

classified [Meggers, Corliss, and Scribner, 1975; the energy levels for the classifications in this reference were taken from Blaise, Chevillard, Verges, Wyart, and van Kleef, 1971].

Spector and Held [1970] photographed and measured 950 Gd lines between 7200 and 12315

A, and assigned about 900 lines to either Gd I or Gd n. Blaise, Chevillard, Verges, Wyart, and

van Kleef [1971] give 966 Gd lines between 8331 and 24552 A, with most of the 760 classified

lines belonging to Gd I.

History of the Analysis

In his remarkable 1935 paper Albertson gave the first analyses of both Sm I and Gd I, including the ground term and its configuration assignment in each case. In addition to the 5

levels of the Gd I 4/

7

( 8 S°)5d6s 2 9 D° ground term, he found 30 upper even levels and classified 71 lines in a then unpublished list of King.

The analysis was continued by Russell [1942, 1950] and greatly extended to include the

4/ 7

( 8 S°)5d6s 2 8 D° term, the low 4/ 7( 8 S°)5d2 6s 9 F° and 11 F° terms, the high 4/ 7

( 8 S°)5d6s7s 9 D°,

11 D° and 4/ 7

( 8 S°)6s 2 7s 9 S° terms, and about 200 even levels. He classified 1200 lines from

King’s list, including most of the stronger lines. Klinkenberg [1946] first obtained g values for the levels of the ground term and for 17 upper even levels. He independently assigned several of the even levels to the two lowest 9 D

terms of 4/ 7

( 8 S°)5c?6s6p and noted that the low even 9 P term belonged to 4/ 7

( 8 S°)6s 2 6p. Mainly

on the basis of more extensive Zeeman data (see below), Pinnington [1967] identified two

4/ 7

( 8 S°)6s 2 6p 7 P levels and assigned a number of other even levels to new 4/ 7 ( 8 S°)5d6s6p

terms. Spector [1971] corrected the assignments of two low even levels and arranged the

4/ 7( 8 S°)6s 2 6p levels into two Jjj-coupling terms. A collaborative effort of spectroscopists at the Zeeman Laboratory, Amsterdam, and the

Laboratoire Aime Cotton, Orsay, has greatly extended the analysis to include 236 odd levels and 371 even levels [van Kleef, Slooten, Blaise, and Camus, 1970; Blaise, Wyart, and van Kleef,

1970; Blaise, Chevillard, Verges, Wyart, and van Kleef, 1971; van Kleef, Blaise, and Wyart,
210 Gd I —Continued

1971], All level values are taken from the last two references; the levels are given to three

decimal places, but it is apparent that many of the values were quoted only to the nearest

0.005 cm In addition to the new wavelength measurements mentioned above, these authors

also had available extensive new Zeeman data (see below). Their results include a number of

revisions of the previous analysis.

Theoretical Interpretation, Calculations

All identified levels are based on one of the two core terms 4/ 7

( 8 S°) or 4/ 8( 7 F); the next

lowest term of the 4/ 7 core, the 6 P° term, is predicted to be about 32500 cm'1 above the 8 S° term. The identification of the entire system based on 4/ 8

( 7 F) is due to the Amsterdam-Orsay

group.

The eigenvector percentages for the odd levels are from Wyart’s thesis [1973], His

calculations included the (4/

7

( 8 S°,

H P0 )5d6s 2 +4/ 7

( 8 S

0 )5d2 6s+4/ 7

( 8 S°)5dx

) subconfigurations with

their interactions, and he also calculated the 4/ 7

( 8 S°)5d6s7s group. No calculations of

configurations based on the 4f* core are available. Van Kleef et al. [1971] note that the 4/ 8 6s6p

configuration assignments, which begin at 25658 cm' 1

, are based mainly on strong transitions

to the 4/ 8 6s 2 F levels. These assignments have been listed tentatively above 32000 cm' 1 , pending a calculation of the odd configurations in this region. Van Kleef et al. did not list term

assignments for the 4/ 8 6s6p levels but noted the appropriateness of a Jx j coupling scheme. An

example of the scheme is the designation if H CF(X )6s6pC~P°2 ) for the tentative level having J=

8

at 27797 cm” 1. Much of the interpretation of the even level system above about 26000 cm”1 appears as yet uncertain. Only the analysis of Russell was available to Nir [1969] when he calculated the

group (4/ ( 8 S°)6s 2 6p+4/ ( 8 S°)5<i6s6p+4/ 7 ( 8 S

0 )5d 2 6p), and no more complete calculations are

available. All eigenvector percentages are from Nir, but a number of the levels belonging

mainly to this group were subsequently found and assigned independently of his calculation

[van Kleef et al., 1971], The 4/ 8

(

7 F)5d6s subconfiguration is especially prominent among the

additional even groups found by van Kleef et al. to overlap the above group. The strong

configuration interaction and intermediate coupling already evident in Nir’s results obviate any

meaningful names for many of the levels, and these effects can only be increased if additional

configurations are included. In the arrangement here we have omitted term names indicated as inappropriate by the assigned eigenvectors, and almost all of the designations of levels above

30000 cm” 1 are given as questionable. In cases of disagreement we usually followed the

suggested interpretation of van Kleef et al. (the data available to them being much more

extensive) or omitted configuration and/or term assignments for the levels in question. The

configuration assignments of a number of the levels are based partly on measured isotope

shifts; some recent suggestions made by Ahmad, Saksena, and Venugopalan [1976] on this basis have been taken into account. A few of the suggested assignments of levels to Nir’s

eigenvectors were made by us. More complete calculations of both the even and odd levels for

this spectrum are badly needed.

g Values, Ionization Energy

Smith and Spalding [1961] measured g values for the levels of the 4/ 7 5d6s2 9 D° ground

term, using an atomic-beam magnetic-resonance method. Their g values are given here for the

lowest three levels, the uncertainties being four to six units in the fourth place. All of the

three-place g values and some of the two-place values represent weighted averages that

include Pinnington’s results [1967], His measurements of optical Zeeman-effect patterns gave g

values for 118 levels of Gd I, with probable errors varying from 0.001 to 0.01. The majority of

the g values are from the very complete measurements of the Zeeman effect by van Kleef,

Blaise, and Wyart. These authors used Zeeman-effect spectrograms (2700-11400 A)

photographed at Argonne by Noorman and Fred. Van Kleef et al. gave values to the nearest

0.005, but we have truncated their values to two decimals to distinguish them from the threeplace averages. The latter are usually taken close to Pinnington’s values if the probable error

is =£0.005; the overall agreement of the two sets of measurements is satisfactory. Spector’s

unpublished measurements of the g values for about 20 levels were also used in the averages.

Some of the levels noted by van Kleef et al. or by Blaise [1976] as showing the Paschen-Back
Gd I —Continued 211

effect are indicated here by colons following the g values.

Worden, Conway, Paisner, and Solarz [1977] observed high series members in Gdl using a stepwise laser photoionization technique. These data became available too late for inclusion

here, but the quoted ionization energy was determined from the new series.

References

Ahmad, S. A., Saksena, G. D., and Venugopalan, A., Physica (Utrecht) 81C, 366 (1976). ND CL IS Albertson, W., Phys. Rev. 47, 370 (1935). EL CL

Blaise, J., private communication (1976). ND ZE

Blaise, J., Chevillard, J., Verges, J., Wyart, J. F., and van Kleef, T. A. M., Spectrochim. Acta, Part B 26, 1 (1971). EL

CL W ZE

Blaise, J., Wyart, J. F., and van Kleef, T. A. M., C. R. Acad. Sci., Ser. B 270, 261 (1970). EL ZE

Eremin, M. V., and Maryakhina, 0. I., Opt. Spectrosc. (USSR) 26, 479 (1969). ND PT

Hoekstra, R., and Slooten, R., Spectrochim. Acta, Part B 26, 341 (1971). Wavelength Accuracy

King, A. S., Astrophys. J. 97, 323 (1943). W

Klinkenberg, P. F. A., Physica (Utrecht) 12, 33 (1946). EL ZE

Meggers, W. F., Corliss, C. H., and Scribner, B. F., Nat. Bur. Stand. (U.S.), Monogr. 145, Part I, 387 pp. (1975). CL

Nir, S., Thesis, Hebrew Univ. Jerusalem, Israel, 216 pp. (1969). ND PT

Pinnington, E. H., J. Opt. Soc. Am. 57, 1252 (1967). EL ND ZE

Russell, H. N., Astrophys. J. 96, 11 (1942). EL CL IP

Russell, H. N., J. Opt. Soc. Am. 40, 550 (1950). EL CL IP

Smith, K. F., and Spalding, I. J., Proc. R. Soc. London, Ser. A 265, 133 (1961). ZE

Spector, N., unpublished material (1967). ZE

Spector, N., J. Opt. Soc. Am. 61, 1350 (1971). ND

Spector, N., and Held, S., Astrophys. J. 159, 1079 (1970). W

van Kleef, T. A. M„ Blaise, J., and Wyart, J. F., J. Phys. (Paris) 32, 609 (1971). EL ZE PT

van Kleef, T. A. M., Slooten, R., Blaise, J., and Camus, P., C. R. Acad. Sci., Ser. B 270, 204 (1970). EL ZE

Worden, E. F., Conway, J. G., Paisner, J. A., and Solarz, R. W., unpublished material (1977). IP Wyart, J. F„ C. R. Acad. Sci., Ser. B 271, 849 (1970). PT

Wyart, J. F., Thesis, Univ. Paris-Sud, Orsay, 194 pp. (1973). ND PT

[July 1976]

Gd I, Odd Parity

Configuration Term J

Level (cm -1

) 9 Leading

percentages

4/7( 8 S°)5d6s2 9 D° 2 0.000 2.6514 95 3 215.121 2.0708 94 4 532.977 1.8392 93 5 999.121 1.720 92 6 1719.087 1.660 95

4/7

( 8 S°)5d2

( 3 F) ( 10 F°)6s lijr 0 2 6378.1 16 2.980 98 3 6550.395 2.237 98 4 6786.181, 1.935 98 5 7103.1,20 1.781 98 6 7180.31$ 1.72 98 7 791,7$91, 1.695 98 8 8198.131 1.62 99

4/7

( 8 S°)5e£6s2 7 D° 5 6976.508 1.600 90 4 7231.910 1.65 90 3 7126.710 1.744 90 2 7562.157 1.995: 91

1 7653.927 2.979: 91
Gd I. Odd Parity—Continued

Configuration Term J

Level (cm ') 9 Leading

percentages

4/7

( 8 S°)5d2( 3 F) ( 10 F°)6s 9F° 1 10222233 3.466 79 2 10359.905 2.144 78 3 10576410 1.814 77 4 10883.505 1.684 75 5 11296465 1.619 74 6 11830.393 1.58 70

7 12486.547 1.56 70

4/7

( 8 S°)5d2( 3 P) ( 10 P°)6s np° 4 11685.594 2.19 98 5 12057.164 1.96 98 6 12345.966 1.82 94

4/7( 8 S°)5d2

( 3 P) ( 10P°)6s 9 P° 3 15173.639 2.23 83 4 15519.180 1.92 71 5 15720.715 1.75 51

4/7( 8 S°)5d2

( 3 F) ( 8 F°)6s 9 F

° 2 15744.826 2.08: 74 3 15758277 1.81: 68

1 15758.651 3.33: 79 4 15833.797 1.71 59 5 15989.463 1.65 46 6 16228.822 1.60 57

7 16758.940 1.57 68

4/7

( 8 S°)5d2( 3 F) ( 8 F°)6s 7 F° 0 15972270 87

1 16012.884 1.64: 82 2 16078.047 1.57: 76 3 16165.993 1.54 71 4 16296.617 1.55 68 5 16534.515 1.53 62 6 17015.950 1.52 76

4/7( 8S°)5d2

(

1 D) ( 8 D°)6s 9 D° 2 17332222 2.64: 89 3 17362.198 2.07: 78 4 17439.747 1.83 69 5 17600.818 1.71 67 6 17906.737 1.63 75

4/7( 8 S°)5d2(

1 D) ( 8 D°)6s 7 D° 3 18993.172 1.73 72 2 19014-075 2.00 80 4 19022.740 1.63 65

1 19062222 2.96 89 5 19085.785 1.58 40

4/7

( 8 S°)5d2

(

1 G) ( 8G°)6s 9 G° 0 19361.800 94

1 19375.576 1.49 93 2 19403.104 1.50 93 3 19445.555 1.50: 85 4 19507.993 1.51 86 5 19592.485 1.51 90 6 19682.130 1.50 92 7 19781.555 1.51 94 8 19850.132 1.50 96

4/7( 8 S°)5d2

( 3P) ( 8P°)6s 9p° 3 19574-024 2.22 71 4 19718.720 1.92 66 5 19978.775 1.76 63

4/7

( 8 S°)5d2

( 3 F) ( 6 F°)6s 5 F

° 3 20299.870 1.25: 65 2 20303.800 0.93: 56

1 20306.942 0.03: 50 4 20324-722 1.37 73 5 20588292 1.49 39

4/7

( 8 S°)5d2( 3 P) ( 8P°)6s 7 P° 2 20565.620 2.27 79 3 20759.674 1.86 68 4 21152.850 1.72 66
Gd I, Odd Parity—Continued

Configuration

4/7( 8 S°)5d2

(

1 G) ( 8G°)6s

4/7

( 8 S°)5d3

( 4 F)

4/8( 7 F)6s6p

4/8

( 7 F)6s6p

4/8

( 7 F)6s6p

4/7( 8 S°)5d3(4 P)

4/8( 7 F)6s6p

4/8( 7 F)6s6p

4/8( 7 F)6s6p

4/8

( 7 Fe)6s6p(3 P2)

4/8( 7 F)6s6p

4/8

( 7 F)6s6p

4/8

( 7 F)6s6p

4/7( 8 S°)5d3

( 4 F)

4/8

( 7 F)6s6p

4/8

( 7 F)6s6p

4/8( 7 F)6s6p

4/8( 7 F)6s6p

4/8( 7 F)6s6p

4/8( 7 F)6s6p

4/8

( 7 F)6s6p

4/8

( 7 F)6s6p

4/8( 7 F)6s6p

Term

7 G°

up0

np°

( 6, 2 )°

J

Level (cm -1

) 9 Leading

percentages

6 21389.502 1.42 94 5 211*39.715 1.36 90 7 215U.952 1.43 97 4 21544-680 1.34 72 3 21647.935 1.21 66 2 2171*5.650 0.90 55

1 21815.61*5 -0.36 50

2 22429.156 98 3 22602.550 98 4 22835.400 98 5 231281224 98 6 23479211 98 7 23883.504 98 8 24332.715 98

6 25658.055 1.58

7 25676.890 1.54

5 26651.912 1.57

4 27026.088 2.18 97 5 27258.986 1.95 97 6 27715.350 1.81 99

6 27343.873 1.48

5 27628230 1.50

4 27648.774 1.66

8 27797.6031 1.50?

6 27829.680 1.55

7 27981.472 1.46

6 28366.491 1.53

2 28725.150 2.16: 96

1 28741.590 3.45: 98 3 29041.722 1.80 94 4 29174-580 1.67 91 5 29439.330 1.61 90 6 29867.535 1.58 90 7 30367.361 1.56 93

5 28837240 1.51 5 28938287 1.44

5 29312.770 1.52 6 29420.675 1.47

4 29672.515 1.49

4 30289.386 1.46

4 30583.740 1.64 6 30749.194 1.41 3 31542.413 1.66

5 31633.995 1.71 4/ 5 31766.595 1.35 8

( 7 F)6s6p
214

Gd I, Odd Parity—Continued

Configuration Term J

Level (cm -1

) 9 Leading

percentages

4/7( 8 S°)5d ( 9 D°)6s ( 10 D°)7s ll D° 3 31907.020 2.496 99 4 32176.447 2.09 98 5 32547.600 1.89 97 6 33061.555 1.77 97 7 33804-505 1.71 100

4/8 6s6p? 2 32167.925 1.17

3 32181.645 2.19 4/8 6s6p? 2 32220.343 1.78 4/8 6s6p? 1 32660.836 2.81

4/7( 8 S°)5d3

( 4 P) 9P° 3 44 4 32925.478 1.93 55 5 33491.370 1.78 78

4/8 6s6p? 7 32928.702 1.44

4/7( 8 S°)5d ( 9 D°)6s ( 10 D°)7s 9D° 2 32957.765 2.65 93 3 33195.300 2.07 92 4 33534-711 1.85 91 5 34044-330 1.72 90 6 34754-990 1.62 94

4/8 6s6p? 4 33088.337 1.46 4/8 6s6p? 3 33189.474 1.00 4/7

( 8 S°)5d3

( 4 P) 4 33734-095 1.93 32 9P° 4/7

( 8 S°)5d3

( 2 D2) 5 33782.140 1.77 37 9D°

4/8 6s6p? 5 33823.080 1.50 3 33951.525 2.22 4/7

( 8 S°)5d3

( 4 F) 7 F° 4 34554-985 1.54: 73

6 34623.935 1.44 4/8 6s6p? 4 34698222 1.56

4/7

( 8S°)6s2 7s 9 S° 4 34719.128 1.98

5 34720.193 1.50 4/8 6s6p? 6 34811.786 1.48 2 34906200 1.94

4/8 6s6p? 5 34911.443 1.46

4/7( 8 S°)6s2 7s 7 S° 3 34984-563 1.88

3 35045.755 1.80

4/7( 8 S°)5d ( 9 D°)6s ( 8 D°)7s 7 D° 1 35254-585 2.98 91 2 35435.990 1.99 79 3 35716.787 1.84 50 4 36326.630 1.67 66 5 37204-746 1.51 81

4/7( 8S°)6s6p2( 4 P) lip° 4 35561.302 2.18 5 36381.675 1.91 6 37460.787 1.78

4/8 6s6p? 4 35603.585 1.42
Gd I, Odd Parity—Continued

Configuration Term J

Level (cm 1 ) 9 Leading

percentages

4/7( 8 S°)5d ( 9 D°)6s ( 8 D°)7s 9 D° 2 35606.143 2.61 74 3 35860.584 1.99 46 4 36060.122 1.74 65 5 36541260 1.68 72 6 37150.790 1.65 66

4/8 6s6p? 3 35997.029 1.29

4 361 79.444 1.69:

3 36182.700 1.78:

4/8 6s6p? 2 36268.455 0.97

4/8 6s6p? 7 G° 1 36360.088 -0.41

4/8 6s6p? 4 36386.383 1.52

4/8 6s6p? 3 36576.972 1.46

4 36616.719 1.51 4/8 6s6p? 5 36653.970 1.58

4/8 6s6p? 5 36853.110 1.56

4/8 6s6p? 2 36895.845 1.41

4/8 6s6p? 4 37041205 1.44

4/8 6s6p? 4 37123.736 1.58

4/8 6s6p? 3 37215.945 1.39

4/8 6s6p? 1 37246.590 1.04

3 37248.528 1.60

4/7( 8 S°)5d3( 2G) 7 G° 6 37288.663 1.47

9 D°? 2

3 37313.720 2.07 4 37544290 1.80 5 37908.489 1.68 6 38024800 1.65

4/7( 8S°)5d3( 2 F) 9 F° 1 37385210 3.58: 4 37463.818 1.60 85 2 37529.785 2.07: 87 3 37548.383 1.80: 88 5

6

7

4/8 6s6p? 2 37416.590 1.51

2 37424-457 1.97:

4/8 6s6p? 0 37531.095

4/8 6s6p? 1 37544.453 0.29

4/8 6s6p? 3 37604-950 1.82 3 37648.503 1.98

3 37669207 2.08 4/7

( 8 S°)5d3 7p° 4 37702.758 1.74

- 5 37722.087 1.88 4/8 6s6p? 2 37913.508 1.89 3 37933.446 1.50 3 38108217 2.18 4/8 6s6p? 1 381 73.340 2.91 6 38245.743 1.64:
Gd I, Odd Parity—Continued

Configuration Term J

Level (cm' 1

) 9 Leading

percentages

5 38275.950 1.80

7 38376280 1.64

5 38A03.922 1.91 np°? 3 38582.555 2.16 i»F°? 4 38589.360 1.89

8 38693.120 1.60

7 38825.1 U8 1.58

4/7( 8 S°)5d ( 7 D°)6s(8 D°)7s 9 D° 6 391f58.li.10 1.66 69 5 63 4 A0125.073 1.72 50 3 54 2 A0A52283 2.00 71

7 39805273 1.52

3 39881f.550 2.23

4/7( 8S°)5d ( 7 D°)6s(6D°)7s 4 39897.703 1.71 41 7 D°

6 IfOOlfl 250 1.62

5 If0058.09

5

1.69

3 If0078.81f3 1.85

5 It0153.1t73 1.87

5 If0281f.lf23 1.77

3 A0588.967 2.29

5 lf0891f.570 1.56

4 If 1021.507 1.83

6 U212.620 1.61

4 Jfl370.1f73 1.99

6 Ifl 71 If. 780 1.58

7G° 1 If 1883. 7AO -0.41

2 Ifl982.71f9 0.80

3 A2103.120 1.17

2 12167.60

A

2.38

6 12213.821 1.51

7 12582.59

A

1.51

4 A2839.A22 2.03

4/7( 8 S°)5d6s8s? 9 D

° 6 A3963.900 1.60

Gd II ( 10 D§/2) Limit A9603 |
217

Gd I, Even Parity

Configuration Term

1 J

Level (cm ') 9 Leading percentages

TPW 1 7F 6 10947.210 1.48 5 12519.997 1.49 4 13506.051 1.50 3 14253.948 1.51 2 14777.975 1.51

1 15121.220 1.49 0 15289.035

4/7( 8 S°)6s2 6p

9P 3 13433.851 2.22 70 4 13926.311 1.89 57 5 15665.424 1.80 69

4/7( 8 S°)5d ( 9 D°)6s6p(3 P°) up 2 14036.026 2.96 92 3 14298.311 2.22 90 4 14669.148 1.92 88 5 15174.000 1.78 86 6 15852.245 1.70 85

7 16775.024 1.63 89 8 17909.944 1.62 99

4/7

( 8 S°)5d ( 9 D°)6s6p(3 P°) ll D 3 16061.273 2.42 86 4 16195.999 1.97 56 5 16885.739 1.88 83 6 17318.942 1.77 87

7 18014.403 1.70 88

4/7

( 8 S°)5d ( 9 D°)6s6p(3 P°) 4 16824.589 1.90 34 UD 33 4/7

( 8 S°)6s2 6p 7 P

4/7

( 8 S°)6s2 6

p

7 P 3 16920.400 1.994: 61 10 ( 8S°)5d ( 9 D°)6s6p(3P°) 7 P

2 16923.378 2.354: 60 15

4/7( 8 S°)5d ( 9 D°)6s6p(3 P°) 9 F 1 17227.969 3.33 67 2 17380.827 2.105 63 3 17617.767 1.79 60 4 17973.611 1.69 38 24 ( 8S°) ( 9D°)(3P°) 9 D

5 18509.198 1.61 53 17 ( 8S°) ( 9 D°)(3 P°) 7 D

6 19480.008 1.59 72 7 20434.115 1.57 81

4/7

( 8 S°)5d ( 9 D°)6s6p(3 P°) 9 D 2 17749.978 2.606 73 3 17795.267 2.076 83 4 17930.516 1.83 50 18 ( 8S°) ( 9 D°)(3P°) 9 F

6 18070.257 1.71: 46 32 ( 8S°) ( 9 D°)(3P°) ll P

5 18083.642 1.75: 56 21 ( 8 S°) ( 9 D°)(3P°) "P

4/7( 8 S°)5d ( 9 D°)6s6p(3 P°) "P 4 19164.774 2.17 86 5 19525.374 1.905 71 6 20160.144 1.78 59 35 ( 8S°) ( 9 D°)(3 P°) 9D

4/7

( 8 S°)5d ( 9 D°)6s6p(3 P°) 7 D 1 19285.485 3.111: 71 2 19330.624 2.039: 67 3 19399.839 1.775: 62 4 19507.332 1.665 58 23 ( 8S°) ( 9D°)(3 P°) 9F

5 19700.606 1.64 56 21

4/7

( 8 S°)5d ( 9 D°)6s6p(3 P°) 7 F 0 21347.427 79

1 21381.514 1.50 77 2 21450.164 1.49 73 3 21543.156 1.560 60 4 21674.730 1.561 39 27 ( 8S°) ( 9D°)(3P°) 9P

5 21905.353 1.57 48 11 6 22452.867 1.54 62

4/7

( 8 S°)5d ( 9 D°)6s6p(3 P°) 9P 3 21857.475 2.169 71 4 22225.537 1.855 45 22 ( 8S°) ( 9D°)(3P°) 7 F

5 22718.314 1.70 43 13 ( 8S°) ( 7 D°)(3P°) 9 D

4/7

( 8 S°)5d ( 9 D°)6s6p( 1 P°) 2 22334.508 2.631 33 9D 29 ( 8S°) ( 7 D°)(3P°) 9 D

225-298 0 - 78-15
218

Gd I, Even Parity—Continued

Configuration Term J

Level (cm' 1 ) 9 Leading percentages

4/7( 8S°)5d ( 7 D°)6s6p(3P°) 9 D 3 22563.824 2.077 40 27 ( 8S°) ( 9D°)(‘P°) 9 D

4 22820.895 1.849 50 17 ( 8S°) ( 9D°)( 1 P°) 9D

5 23196.410 1.74 44 22 ( 8S°) ( 9D°)(3P°) 9P

6 23229.298 1.65 62 2 24655.639 2.632 45 22 ( 8S°)5d2

( 3 F) ( 10 F°)6p 9D

4/7( 8S°)5d2( 3 F) ( 10 F°)6p 1 23103.660 3.549: 29 MG 25 ( 8S°)5d (9D°)6s6p(‘P°) 9 F

4/7( 8 S°)5d ( 9 D°)6*6p( 1 P

0

) 2 23215.028 2.176: 25 9F 25 ( 8S°)5d2

( 3 F) ( 10F°)6p ll G

4/7( 8S°)5d ( 9 D°)6s6p( 1 P°) 3 23389.782 1.833 24 9F 20 ( 8S°)5d2

( 3 F) ( l0 F°)6p “G

4/7( 8 S°)5d ( 9 D°)6s6p( , P°) 4 23644.156 1.696 23 9F 18 ( 8S°)5d2

( 3 F) ( 10F°)6p 9 F

4/7(8 S°)5d ( 9D°)6s6p(1 P°) 5 23999.912 1.631 21 9F 18 ( 8S°)5d2

( 3 F) ( 10F°)6p 9 F

4/8( 7 F)5d ( 8G)6s 9G 7

Q 24255.103 1.51

6 24854.297 1.555 5 25380.885 1.63 4 25820.720 1.580 3 26247.609 1.60 2 26588.338 1.70

1 26834.311 2.26 0 27089.815

4/7

( 8S°)5d ( 9 D°)6s6p(1 P°) 6 24430.425 1.580 20 9F 17 ( 8S°)5d2

( 3 F) ( 10 F°)6p 9 F

4/7( 8 S°)5d ( 9 D°)6s6p(3 P°) 7 P 2 24458.988 2.31 64 3 24860.040 1.87 70 4 25920.888 1.58 63

4/7( 8 S°)5d ( 7 D°)6s6p(3 P°)? 5 24660.325 1.51 44 5F 35 (8S°) ( 7 D°)(3P°) 7 D

4/7

(8 S°)5d ( 7 D°)6s6p(3 P°) 3 24714.841 2.042 34 9D 23 ( 8S°)5d2

( 3 F) ( 10F°)6p 9 D

4/7( 8 S°)5d ( 7 D°)6s6p(3 P°) 4 24849.514 1.82 22 9D 16 (8S°) (9D

o )( ip=

) 9 D

4/7( 8 S°)5d ( 7 D°)6s6p(3 P°) 7 D 4 24988.884 1.65 44 9 ( 8S°) ( 9 D°)(3P°) 5P

3 25253.838 1.784 58 16 ( 8 S°)5d2

( 3 F) ( 10 F°)6p ll G

2 25337.755 2.06: 65

1 25352.706 3.07: 73 5 25732.850* 1.50 43 31 ( 8S°) ( 7 D°)(3P°) 5 F

4/7

( 8 S°)5d (9D°)6*6p(l P

0

) 5 25043.649 1.65 30 9 D 25 ( 8S°)5d2

( 3F) ( 10F°)6p 9 D

4/7( 8S°)5d2

( 3 F) ( 10 F°)6p UG 1 25069.179 3.764: 66 2 25164.640 2.21: 57 13 ( 8S°)5d ( 7 D°)6s6p( 3P°) 7 D

3 25403.265 1.857 49 15 ( 8S°)5d ( 9 D°)6s6p( 1 P°) 9F

4 25571.672* 1.70 35 25 ( 8S°)5d ( 7 D°)6s6p( 3P°) 5F

5 25940.122 1.64 60 6 26337.071 1.61 53 11 ( 8S°)5d (9 D 9D

7 26870.393 1.57 85 8 27536.397 1.56 92 9 28432.859 1.54 100

4/7( 8S°)5d ( 9 D°)6s6p(1 P°) 7 25376.313 1.58 32 9F 23 ( 8S°)5d2

( 3 F) ( 10F°)6p 9F

4/7(8 S°)5d ( 7 D°)6s6p(3 P°)? 4 25621.293 1.57 35 5 D 30 ( 8S°) ( 7 D°)(3P°) 7 F

4/7

( 8S°)5d ( 7 D°)6s6p(3 P°) 6 25661.340 1.62 21 9D 21 ( 8S°) ( 7 D°)(3P°) 7 F

4/8( 7 F)5d ( 8 D)6s 9 D 6 25815.330 1.55 5 26335.661 1.58 4 27704.965 1.73 3 28215.140 1.96 2 28785.230 2.31
219

Gd I, Even Parity—Continued

Configuration Term

I J

Level (cm -1

) 9 Leading percentages

4/7

( 8S°)5d ( 7 D°)6s6p(3P°) 7 F 3 26101.585 1.38 41 29 ( 8S°) ( 7 D°)(3P°) 5D

6 26568.265 1.55 30 19 ( 8S°)5d2

( 3 F) ( 10F°)6p UG

5 26615.044 1.55 52 9 ( 8S°) (9D°)( 1 P°) 9F

1 26616.320 1.18 41 32 ( 8S°) ( 7 D°)(3 P°) 5 D

0 26742.308* 49 36 ( 8S°) ( 7D°)(3P°) 5 D

4 26866.385* 1.565 43 11 ( 8S°) ( 9D°)(»P°) 9 F

9F 7 26145.852 1.550 4 27040.865 1.60: 3 27041.751 1.67: 2 27118.725 1.84:

1 27129.239 2.34: 5 27315.791 1.63 6 27336.898 1.53

4/7( 8S°)5d ( 7 D°)6s6p(3 P°) 2 26397.585 1.29 30 5 D 27 ( 8S°) ( 7 D°)(3P°) 7 F

4/7( 8 S°)5d2( 3 F) ( 10 F°)6p? 4 26451.785 1.48 32 “G 25 ( 8S°)5d ( 7 D°)6s6p( 3 P°) 5 D

4/7

( 8S°)5d ( 7 D°)6s6p(3P°) 5 F 3 26730.757 1.42 49 25 ( 8S°) ( 7 D°)(3P°) 5 D

4/7( 8 S°)5d ( 7 D°)6s6p(3P°) s F 2 26882.867 1.28 56 19 ( 8S°) ( 7 D°)(3P°) 5 D

4/8

( 7 F)5d ( 8G?)6s 7 G 7 26924.525 1.48 6 27081.048 1.50 5 27571.672 1.61 4 28168.665 1.54 3 28648.530 1.25 2 29089.945 1.17:

1 29323.963 -0.42

4/7( 8S°)5d ( 7 D°)6s6p(3 P°) 5 F 1 26955.249 0.63 87

4/7

( 8S°)5d ( 9 D°)6s6p(1 P°) 9P 3 27135.695 2.240 53 14 ( 8S°)5d2(‘D) ( 8 D°)6p 9 P

4/7( 8 S°)5d ( 9 D°)6s6p( 1 P°) 4 27425.245 1.914 37 9P 24 ( 8S°) ( 7 D°)(3 P°) 9P

4/7( 8 S°)5d ( 7 D°)6s6p(3 P°) 3 27475.740 1.58 26 9F 25 ( 8S°) ( 7 D°)(3 P°) 7 F

4/8

( 7 F)5d (8 H)6s 9 H 9 27556.066 1.44 8 28272.575 1.42 7 28892.913 1.40 6 29444.375 1.36 5

43

29888.205 1.36:

4/7

( 8S°)5d2

(3 F) ( 10 F°)6p ll F

z

1

2 27660.440 2.88 93 3 27861.093 2.223 90 4 28111.670 1.83 91 5 28450.948 1.78 91 6 28841.676 1.70 88 7 29293.618 1.63 81 8 29794.750 1.57 70

4/7

( 8 S°)5d ( 9 D°)6s6p( 1 P°) 5 27731.202 1.62 30 9P 26 ( 8S°) ( 7 D°)(3P°) 9 F

4/7

(8S°)5d ( 7 D°)6s6p(3P°) 2 27736.681 1.65 39 5 D 26 ( 8S°) ( 7 D°)(3P°) 7 F

4/7( 8 S°)5d ( 7 D°)6s6p(3 P°) 5 D 1 27880.718 1.56 52 24 ( 8S°) ( 7 D°)(3P°) 7 F

4/7

( 8S°)5d ( 7 D°)6s6p(3 P

0

) 5 D 0 27949.912 57 23 ( 8S°) ( 7 D°)(3 P°) 7 F

4/8( 7 F)5e£6s? 7 F? 5 28414.925 1.55
220

Gd I, Even Parity—Continued

Configuration

4/7

( 8 S°)5d ( 7 D°)6s6p(3P°)

4/7( 8 S°)5d2( 3 F) ( 10 F°)6p

4/8( 7 F)5d6s?

4/7( 8 S°)5d ( 7 D°)6s6p(3 P°)?

4/7

( 8 S°)5d6s6p?

4/7

( 8 S°)5d2

( 3 F) ( 10 F°)6p

4/8

( 7 F)5d6s?

4/7( 8 S°)5d2 6p?

4/8

( 7 F)5d6s?

4/7( 8 S°)5d6s6p?

4/8

( 7 F)5d6s?

4/7( 8 S°)5d2( 3 F) ( 10 F°)6p

Term J

Level (cm -1

) g

sp 3 28486.854 1.71 64 2 28716.819 2.00 72

1 29191.604 2.74 90

9 F? 7 28504.435 1.55 6 28731.590 1.58 4 28793.370 1.60 5 29119.955 1.64 3 29426.450 1.93

1 29557.785 3.41 2 29717.231 2.24:

9G 0 28971.965 73

1 28984.690 1.54: 73 2 29005.609 1.30: 72 3 29125.847 1.515: 71 4 29209.220* 1.603: 67 5 29628.388 1.509 66 6 30007.307 1.50 62

7 30505.374 1.51 61 8 31171.622 1.50 59

7 F? 4 29141.205 1.49

7 P? 4 29358.628 1.66 54 3 29681.305 1.86: 38 2 29835.103 2.29 59

6 29362.593 1.51

5 29451.356 1.69

4 29501.640 1.63 U D 3 29631.255 2.26 44 4 29876.618 2.04: 52 5 30242.293 1.80 67 6 30652.018 1.78 74 7 31146.456 1.72 74

7 H? 8 29754.908 1.39 “D? 3 29878.477 1.76

7 D? 5 30197.296 1.52 4 30834.958 1.50 3 31327.520 1.58 2 31549.730 1.71

1 31602.931 2.31

4 30307.480 1.89

2 30394.640 1.77

7 F? 6 30409.890 1.42

9 F 1 30555.827 3.427 62 2 30694.874 2.136 58 3 30881.658 1.878 38 4 31135.795 1.685 45 5 31457.179* 1.614 42 6 32091.730 1.57 51 7 32729.502 1.56 46

5 F? 5 30629.495 1.44

Leading percentages

10 ( 8S°) ( 9 D°)(3 P°) 7 P

25 ( 8 S°) ( 7 D°)(3 P°) 5P

17 ( 8S°) ( 7 D°)(3 P°) S P

26 ( 8 S°)(3P) ( 10P°) nD

31

22 ( 8S°)5d ( 9 D°)6s6p( 1 P°) 9 F

17 ( 8 S°)(3 P) ( 10P°) nD

13 ( 8S°)5d ( 9 D°)6s6p( 1 P°) 9 F

15 ( 8S°)5d (9D°)6s6p( 1 P°) 9 F

15 ( 8S°)5e£ (9D°)6*6p( 1 P

0

) 9 F

20 ( 8S°)(3 P) ( 10P°) "D

4/8( 7 F)5d6s?
221

Gd I, Even Parity—Continued

Configuration Term J

Level (cm -1

) 9 Leading percentages

4/8

( 7 F)5d6s? 7 G? 7 30680.188 1.45 6 32221.202 1.43 5 32931.787 1.42 4 33436.430 1.41 3 33942.500 1.28 2 34285.465 0.85

1 34466.621 -0.30

4/7( 8S°)5d6s6p? 3 30809.375 2.15

1 30909.913 2.16

5 31279.165 1.46 4/8

( 7 F)5d6s? 7 H? 8 31546.432 1.36 4/8

( 7 F)5d6s? 7 H? 5 31676.675 1.24 5 31777.972 1.62: 4/7

( 8S°)5d ( 7 D°)6s6p( 1 P°)? 6 31794.775 1.48 28 7 F 20 ( 8S°)5d2

( 3P) ( 10P°)6p n D

4/8

( 7 F)5d6s? 7 F? 4 31847.478 1.50: 4/7

( 8 S°)5d2

( 3 F) ( 10 F°)6p? 4 31859.283 1.64: 17 nD 14 ( 8S°)5d ( 7 D°)6s6p( 1 P°) 7 D

4/7( 8 S°)5d2

( 3 P) ( 10P°)6p? 2 31865.242 2.58: 38 9 D 24 ( 8S°)(3 F) ( l0 F°) 9 D

4/7( 8 S°)5d2

( 3 P) ( 10 P°)6p? 3 31869.139 2.12: 30 9 D 21 ( 8S°)(3 F) ( 10 F°) 9D

4/7

( 8 S°)5d ( 7 D°)6s6p( 1 P°)? 3 31999.810 1.57 24 7 F 22 ( 8 S°) ( 7 D°)( 1 P°) 7 D

4/8( 7 F)5d6s? 7 F? 6

5 32020.340 1.54 4 32549.565 1.59 3 33087.060 1.45 2 33602.413 1.38

1 33955.639 1.30 0 34096.945

4/8( 7 F)5d6s? 7 H? 4 32061.483 1.32: 4/7

( 8 S°)5d ( 7 D°)6s6p( 1 P°)? 3 32133.125 1.65 23 7 D 21 ( 8S°) ( 7 D°)( 1 P°) 7 F

4/7( 8 S°)5d (’D^epOP0 )? 2 32149.515 1.70: 28 7 F 19 ( 8S°) ( 7 D°)( 1 P°) 7 D

4/7

( 8 S°)5d2 6p? 4 32157.092 1.90 4/7

(8 S°)5d2

( 3 P) ( 10 P°)6p? 4 32206.820 1.728 18 9D 12 ( 8S°)5d (’D^esepC'P0

) 7 F

4/8

( 7 F)5d6s? 5G? 6

5 32226.746 1.31 4 32984.305 1.23 3 33552.455 1.25 2 34120.150 0.67

4/7

( 8 S°)5d CD^sepPP0 )? 1 32251.757 2.23 33 7 F 15 ( 8S°) ( 7 D°)(1 P°) 7 D

3 32272.125 1.59 4/7

( 8 S°)5d ( 7 D°)6s6p( 1 P°)? 2 32336.079 1.79 27 7 D 19 ( 8 S°) ( 7 D°)( 1 P°) 7 F

4/7

( 8 S°)5d ( 7 D°)6s6p( , P°)? 7 F? 0 32341.098 49 20 ( 8S°)5d2

( 3 F) ( 8 F°)6p 7 F

4/7

( 8 S°)5d ( 7 D°)6s6p( 1 P°)? 1 32356.085 2.25 31 7 D 22 ( 8S°)5d2

( 3 F) ( 8 F°)6p 7 D

4/8

( 7 F)5d6s? 5 F? 3 32384.000 1.44 3 32448.112 1.448 5 32563.597 1.74 4/7

( 8S°)5d2

( 3 P) ( l0P°)6p? 5 32585.125 1.75 33 UD 24 ( 8S°)(3P) ( 10P°) 9 D

4 32785.115 1.832 4 32886.276 1.82 4/8

( 7 F)5d6s? 5 F? 2 32949.825 0.98 4/7

( 8 S°)5d2

( 3 P) ( 10P°)6p? "D? 1 6 32966.862 1.69 52 19 ( 8S°)(3 P) ( 10P°) 9 D
222

Gd I, Even Parity—Continued

Configuration Term J

Level (cm -1

) g Leading percentages

4/8( 7 F)5d6s? 7 H? 6 33013.830 1.26

4/7

( 8S°)5d2( 3 P) ( ,0P°)6p? “S? 5 33231.096 1.95 84

5 33348.226 1.81

4 33568.045 1.88 3 33704.627 1.75

4 33724.517 1.51 5 33732.275 1.47 6 33851.828 1.73 5 33923.459 1.97 2 34147.343 2.119

7 34175.835 1.68

4 34458.220 2.13: 3 34465.872 2.23: 4/7

( 8S°)5d2 6p? up? 5 34517.671 1.95 4/8

( 7 F)5d6s? 5 H? 4 34524.661 0.97

4 34635.520 1.73

4 34698.190 1.53

4/7

( 8S°)5d2( 3 F) ( 8 F°)6p? 9G? 0 34704.810 67

1 34711.445 1.47 65 2 34722.925 1.48 60 3 34765.635 1.48 52 14 (8S°)(1 G) ( 8G°) 9G

4 34836.980 1.47 44 14 (8S°)( 1 G) ( 8G°) 9G

5 34951.016 1.47 36 16 ( 8S°)(3 F) ( 8 F°) 7G

6 35149.140 1.46 27 25 ( 8S°)(3 F) ( 8 F°) 7G

7 36482.515 1.48 45 33 ( 8S°)(3 F) ( 8 F°) 7 G

8 36731.590 1.49 69

3 34913.620 1.66

6 34938.434 1.80

2 35342.327 2.65

3 35360.405 1.89 4/7

( 8 S°)5d2 6p? 3 35442.715 1.94 4/8

( 7 F)5d6s? 7 P? 4 35498.790 1.68

3 35553.915 1.46: 4/7

( 8 S°)5d2 6p? 4 35566.145 1.84

4/7

( 8S°)5d2( 3 F) ( 8 F°)6p? 7G? 7 35579.553 1.47 39 19 ( 8S°)(3 F) ( 8 F°) 9G

1 35744.507 -0.42 84 2 35766.831 0.85 78 3 35811.565 1.22 71 4 35883.613 1.35 65 5 36000.475 1.42 54 24 ( 8S°)(3 F) ( 8 F°) 9G

6 36203.224 1.55 42 34 ( 8S°)(3 F) ( 8 F°) ®G

4/8

( 7 F)5d6s? 7 H? 3 35593.010 1.03

5 35794.634 1.72

1 35908.957 2.71
Gd I, Even Parity—Continued

Configuration Term J

Level (cm -1

) 9 Leading percentages

4/7( 8S“)5d2( 3 F) ( 8 F°)6p? ®F? 1 36024.050 3.39: 65 2 36037.230 2.16: 47 9 ( 8S°)(3P) ( ,0P°) 9D

3 36087.265 1.83 47 7 ( 8S°)(3 F) ( 8 F°) 9G

4 36191.722 1.69 49 6 ( 8S°)(3 F) ( 8 F°) 9G

5 36394.507 1.62 47 12 ( 8S°)(3 F) ( 8 F°) 9 D

6 36772.153 1.59 45 21 ( 8S°)(3 F) ( 8 F°) 9D

7 37343.174 1.55 72

5 36060.305 1.55 6 36147.130 1.59 4/7

( 8S°)5d2 6p? 2 36203.602 2.30

4/7( 8 S°)5d2 6p? 9 D? 2 36850.345 2.65 3 36954.050 1.98 4 37090.080 1.84 5 37279.343 1.74 6 37809.508 1.62

3 37284.744 2.29 3 37385.063 2.13

4 37401.692 1.87 5 37425.155 1.67 2 37486.970 1.60 2 37505.570 2.16

3 37541.235 1.58

4 37661.975 1.70 5 37904.060 1.63

3 38275.565 2.13 2 38322.000 2.31 6 38348.325 1.48

3 38434.970 1.54

4 38495.824 1.86 6 38586.520 1.73

4/7

( 8S°)5d2 6p? 7 D? 1 38627.695 3.02 2 38669.490 2.04 3 38775.670 1.84 4 39022.720 1.70 5 39192.375 1.57

5 38687.305 1.58 6 38792.563 1.43

4/7

( 8 S°)5d2

( 3 F) (®F°)6p? 5 F? 1 39017.320 0.05: 2 39028.020 0.76: 3 39043.934 1.14: 4 39079.645 1.39: 5 39113.910 1.53:

2 39243.930 2.67 9P 4 39323.062 1.92

4/7

( 8 S°)5d2 6p? 9F? 1 39367.155 3.26 2 39426.712 2.04 3 39519.795 1.89 4 39625.560 1.69 5 39790.120 1.60 6 39949.445 1.57 7 40234.024 1.49
224

Gd I, Even Parity—Continued

Configuration Term J

Level (cm' 1

) 9 Leading percentages

3 39404.167 2.00 5 39593.830 1.72 7 39605.305 1.54

6 39608.405 1.65 3 39668.382 1.94

4 39819.045 1.68

4 39938.046 1.63:

5 39971.374 1.54 4/7

( 8S°)5d2 6p? 9 H? 8 40127.198 1.45

6 40160.870 1.49

5 40200.540 1.64:

5 40330.415 1.44 6 40382.555 1.54

4 40391.540 1.47

4/8

( 7 F)6s ( 8 F)7s 9 F 7 40439.513 1.55 6 41069.210 1.52 54

3

2

1

9 40450.605 1.44

5 40463.758 1.59

4 40487.655 1.72

4 40554.495 1.21:

6 40632.680 1.60

3 40684.910 1.34

5 40707.970 1.70

2 40786.235 2.32:

3 40803.185 1.90

5 40865.900 1.41

4 40963.685 1.89

7 41097.255 1.47

4 41127.460 1.55

5 41150.915 1.57

1 41231.060 1.63

5 41283.160 1.38

4 41296.165 1.75

8 41461.330 1.41 6 41624.405 1.40

5 41665.212 1.46

5 41692.155 1.89

Gd it ( 10 Dl/2 ) Limit 49603
225

Gd II

(Eu i sequence; 63 electrons) Z=6

Ground state (ls 2 2s 2 2p6 3s 2 3p6 3d 10 4s 2 4p6 4d 10 5s 2 5p6

) 4/ 7 5e?6s in D 5/2

Ionization energy 97500± 600 cm 1 12.09± 0.08 eV

Identified odd configurations 4/ 7 5c?6s, 4/ 7 6s2

, 4/ 7 5d

2

, 4/ 8 6p

Identified even configurations 4/ 8 6s, 4/ 8 5d, 4/ 7 6s6p, 4/ 7 5d6p

The original analysis of Gd n by Albertson, Bruynes, and Hanau yielded the

4/ 7

( 8 S°)5d6s 10 D° ground term, the ( 8 S°)5d6p in F term (thus accounting for the fundamental

multiplet of the spectrum), and a few other low odd and high even levels. Using King’s list of more than 2600 Gd II lines, Russell [1950] greatly extended the system based on the 4/ 7

( 8 S°) core to include 137 levels classifying 1177 lines. Blaise and van Kleef [1969], Spector [1970a,

1970b], and Blaise, van Kleef, and Wyart [1971] have recently extended the analysis further

and identified levels based on the 4/ 8 core configuration.

More than 300 levels are now known, about equally divided between the two parities. The

values here are from Blaise, van Kleef, and Wyart, who found more than half of these levels. The principal line lists are described in the first section of the text for Gd I. More than

2200 Gd ii lines are now classified, but the most complete description of the spectrum has not been published [see Hoekstra and Slooten, 1971],

g Values

Blaise, van Kleef, and Wyart also derived g values for all the known Gd n levels, using

Zeeman spectrograms (2700-11400 A) photographed at Argonne by Noorman and by M. Fred.

Blaise et al. gave values rounded off to the nearest 0.005, and most of the two-place values

given here result from a further rounding-off of these values. This allows a distinction

between such values and the three-place values obtained from weighted averages of the values

of Desmarais and Pinnington [1967] and of Blaise, van Kleef, and Wyart. Desmarais and

Pinnington derived g values for 67 levels of Gd ii, with estimated errors from ±0.001 to ±0.02. The agreement between the two sets of observations is in general very good. About 30 of the

two-place g values given here also result from averages.

Some odd levels gave Zeeman patterns with significant Paschen-Back effects [Blaise,

1976]. The g values of these levels are followed by colons.

Calculations of the Odd Levels

Zeldes [1953] noted that his calculations of the (4/

7

( 8 S°)5d6s+( 8 S°)5d2

) odd

subconfigurations and the (4/

7

( 8 S°)6s6p±(8 S°)5d6p) even subconfigurations could be improved

by including the effects of intermediate coupling. Smith and Wybourne [1965], Goldschmidt

and Nir [1965, 1971], and Wyart [1973] have since carried out such calculations.

The percentages listed here for levels of the low odd group are from Wyart’s calculation

of (4/

7

(

8 S°,

6 P

0 )6s 2 +4/ 7

( 8 S

0

, 6 P

0 )5d6s+4/ 7

( 8 S

0

, 6 P°)5d2

). Although the 6 P° term of the 4/ 7 core configuration is very high, Wyart’s inclusion of this core term significantly affected the

eigenvectors for the levels nominally based on the 4/ 7 (

8 S°) core. Wyart did not list second

components for the eigenvectors, but gave total percentages from the three configurations;

instead of second components we list the total percentage from a second configuration

wherever a second configuration contributes most of the remaining eigenvector percentage

(after the leading component). For several of the lowest terms the configuration interaction

has a regularity expected for LS coupling. For example, practically all of the —20% mixture of

4/‘5d2 into the eigenvectors of the nominal 4/ 7

( 8 S°)5d ( 7 D°)6s 8 D° levels is due to
226 Gd II—Continued

4/ 7( 8 S°)5d 2 8 D° [Smith and Wybourne, 1965; Goldschmidt and Nir, 1965]. On the other hand,

the combined effects of this configuration interaction and intermediate coupling make it impossible to assemble a physically meaningful 4/ 7

(

8 S°)5d2 8 D° term from the calculated

eigenvectors. Smith and Wybourne [1965] and Goldschmidt and Nir [1965] assigned several

previously unidentified levels to 4/ 7

( 8 S°)5d 2

, and the latter authors also found several new

levels of this subconfiguration. Blaise, van Kleef, and Wyart [1971] found and assigned several

of the highest ( 8 S°)5d2 levels. A large group of uninterpreted odd levels begins only a little above the 4/ 8

(

7 Ffi )6p 1/2 pair

(—32600 cm' 1 ), which are the lowest levels of this subconfiguration. However, most of the 37

expected levels of 4/ 8

(

7 F)6p have been found and unambiguously identified, even though the

calculations included only this subconfiguration [Blaise and van Kleef, 1969; Spector, 1970a;

Blaise, van Kleef, and Wyart, 1971], The eigenvector percentages given here are from Blaise, van Kleef, and Wyart. A few of the 4/ 8

(

7 F)6p assignments probably should not be regarded as

definite until more complete calculations of the odd configurations in this region are made;

three levels for which the agreement between experimental and calculated g values is relatively poor are followed by asterisks. The designation of the level at 36565.69 cm

-1 (/=%)

as the upper level of the 4/ 8

( 7 F6 )6p:V2 term is also given as tentative, since Ahmad, Saksena,

and Venugopalan [1976] find the isotope shift of this level to be more consistent with

assignment to the 4/ 7 5d6s configuration.

Spector [1970a] found that the J x j coupling scheme is best for the 4/ 8

(

7 F)6p configuration.

He discussed the coupling in other Gd ii configurations and noted that in some cases the spins

of the parent terms are good quantum numbers to an unexpected degree. This explained, for

example, the failure to observe any lines of the nominal 4/ 7

( 8 S°) 5d(9 D°)6s 8 D°—4/

8

(

7 F)6s 8 F

multiplet (in the near-infrared spectrum); the multiplet is spin forbidden because of the high

purities of the respective spins of the 9 D° and 7 F parent terms.

Calculations of the Even Levels

The low even levels belong to the 4/ 8

(

7 F)6s and 4/ 8

(

7 F)5d subconfigurations, both of

which are completely known. Spector’s calculation [1970b] has been used for the 4/ 8

(

7 F)5d

level percentages. The experimental g values of the levels designated 8 D :W2 and 8 F2/2 differ by

only 0.05, as compared with the calculated g values of 2.57 and 2.11, respectively. Thus the

experimental g values indicate a stronger mixing of 8 D and 8 F for J=% than the calculated

eigenvectors show, and the assigned designations probably mean very little; in fact, the names

assigned by Blaise and van Kleef [1969] are reversed from those indicated by the eigenvectors.

Similar comments apply to the 8 D5/2 , 8 F 5/2 pair of levels. The leading percentages for the levels of (4/

7

( 8 S°)5d6p+( 8 S°)6s6p) are from Goldschmidt

and Nir [1965, 1971]. Their calculations and those of Smith and Wybourne showed that

previous term assignments for several ( 8 S°)5d6p levels were inappropriate. Zeeman-effect

measurements by Desmarais and Pinnington [1967] confirmed these results and also indicated

that some additional interchanges of designations should be made. Wyart’s [1973] calculation of

this group included the effects of the 4/ 7

( 6 P°) core term, but the eigenvectors are not much

different from those of Goldschmidt and Nir. The assignments appear to be unambiguous

except for two pairs of levels having J=1k (32263 and 32490 cm' 1 ) and J= 9

/

2

(39251 and 39537

cm' 1 ); these levels are followed by an asterisk to indicate the possibility of interchanges of

their compositions.

We have omitted any names for a number of levels of this group. The levels at 29198 cm" 1

(J=5/2 ) ancj 29242 cm-1 (</= 7/2 ), for example, have usually been designated 4/7 ( 8 S°)6s6p( 3 P°) 8 P, although both levels have somewhat larger components of ( 8 S°)5d ( 9 D°)6p 10 D and belong about

equally to 4/ 7 6s6p and 4/ 7 5d6p. The leading percentages for the corresponding two levels assigned to the 10 D term («/=% and «/= 7

/2 ) are also only —40%; the retention of these two not very meaningful names to complete this term is perhaps justified by the positions of the levels and the fact that they do belong mainly to 4/ 7 5d6p.

Goldschmidt and Nir [1971] discuss in some detail the coupling in the configurations based

on the 4/ 7

( 8 S°) core, including the effects of the interaction between 4/ 7

( 8 S°)5d6p and ( 8 S°)6s6p on the coupling in these subconfigurations.

Ionization Energy

Sugar and Reader derived the quoted value for the ionization energy.
Gd II—Continued 227

References

Ahmad, S. A., Saksena, G. D., and Venugopalan, A., Physica (Utrecht) 81C, 366 (1976). ND CL IS Albertson, W. E., Bruynes, H., and Hanau, R., Phys. Rev. 57, 292 (1940). EL CL ZE

Blaise, J., private communication (1976). ZE

Blaise, J., Chevillard, J., Verges, J., Wyart, J. F., and van Kleef, T. A. M., Spectrochim. Acta, Part B 26, 1 (1971). EL

CL W ZE

Blaise, J., and van Kleef, T. A. M., C. R. Acad. Sci., Ser. B 268, 792 (1969). EL ZE

Blaise, J., van Kleef, T. A. M., and Wyart, J. F., J. Phys. (Paris) 32, 617 (1971). EL ZE PT

Brix, P., Z. Phys. 132, 579 (1952). ND IS

Brix, P., and Lindenberger, K. H., Z. Phys. 141, 1 (1955). Hfs IS Desmarais, D., and Pinnington, E. H., J. Opt. Soc. Am. 57, 1245 (1967); 59, 1391 (1969). ND ZE

Goldschmidt, Z. B., and Nir, S., unpublished material (1965). ND PT

Goldschmidt, Z. B., and Nir, S., Physica (Utrecht) 51, 222 (1971). ND PT

Hoekstra, R., and Slooten, R., Spectrochim. Acta, Part B 26, 341 (1971). Wavelength Accuracy

King, A. S., Astrophys. J. 97, 323 (1943). W

Kopfermann, H., Kruger, L., and Steudel, A., Ann. Phys. (Leipzig) [61] 20, 258 (1957). IS Meggers, W. F., Corliss, C. H., and Scribner, B. F., Nat. Bur. Stand. (U.S.), Monogr. 145, Part I, 403 pp. (1975). CL

Russell, H. N., J. Opt. Soc. Am. 40, 550 (1950). EL CL IP

Smith, G., and Wybourne, B. G., J. Opt. Soc. Am. 55, 1278 (1965). ND PT

Spector, N., J. Opt. Soc. Am. 59, 488A (1969). EL

Spector, N., J. Opt. Soc. Am. 60, 763 (1970a). EL CL PT

Spector, N., J. Phys. (Paris) Colloq. C 4 32, 173 (1970b). EL CL PT

Spector, N., Astrophys. J. 159, 1091 (1970c). CL

Spector, N., and Held, S., Astrophys. J. 159, 1079 (1970). W

Sugar, J., and Reader, J., J. Chem. Phys. 59, 2083 (1973). IP Wyart, J. F., C. R. Acad. Sci., Ser. B 271, 849 (1970). PT

Wyart, J. F., Thesis, Univ. Paris-Sud, Orsay, 194 pp. (1973). PT

Zeldes, N., Phys. Rev. 90, 413 (1953). ND PT

[July 1976]

Gd II, Odd Parity

Configuration Term J

Level

(cm -1

) g Leading percentages

4/7( 8S°)5d ( 9 D°)6s 10 D° 5/2 0.000 2.557 96

7

/ 2 261.8hi 2.082 95

9

/ 2 633273 1.862 94

ll/2 1158.9h3 1.74 94

13/2 1935.310 1.70 97

4/7

( 8S°)5d ( 9 D°)6s 8 D° 3

/2 2856.678 2.804 80 14 4/7 5d

2 5

/ 2 3082.011 2.044 79 14

7

/ 2 312727b 1.870 76 13

9

/2 3972.167 1.70 78 13 “/2 hShl-106 1.63 79 17

4/7( 8 S°)6s2 8 S° 7/2 3hhh235 1.92 93 4 4P 5d6s

4/7

( 8 S°)5d2

( 3 F) iop° 3/2 h027.161 3.163 87 10 4P 5d6s

5

/2 1212.756 2.206 87 9

7

/ 2 hhS3.85h 1.894 87 8

9

/ 2 h852.30h 1.76 88 8 u/2 5339477 1.657 86 9

is/2 589726h 1.63 95

15/2 6605.15

1.60 96

4/7

( 8S°)5d ( 7 D°)6s 8 D° ”/2 8551.0h9 1.64 74 21 4

1 5d

2 9

/ 2 888h-809 1.73 72 22

?/2 9112.90h 1.798 73 22

5

/ 2 9328.86U 2.055 74 21

3

/2 9121.697 2.79 74 21
228

Gd II, Odd Parity—Continued

Configuration Term J

Level (cm 1 ) 9 Leading percentages

4/7

( 8 S°)5d ( 7 D°)6s 6 D° 72 10091.567 1.55 92

7

/

2

10391.789 1.60 75 18 4/7 5d2 72 10633.083 1.67 93 72 10802.621 1.87: 94 72 10908223 3.33: 95

4/7

( 8 S°)5rf2

( 3 P) iop° 72 10599.743 2.22 77 20 4/7 5d6s

72 11066.865 1.95 92 n/2 11492204 1.78 90 7 4/7 5d6s

4/7( 8 S°)5oP(3 F) 8p° l h 12662.186 3.99: 94 72 12703.450 1.98: 93 72 12776.067 1.709 92 72 12891.692 1.612 90 72 13076.050 1.57 88 ”/2 13377.976 1.56 87

13/2 13925.734 1.54 94

4/7( 8 S°)5d2

( 3 F) n/2 1 7725.052 1.53 43 6 F°

4/7

( 8 S°)5d2 (’D) 72 1781 7.123 1.59 32 8 D°

4/7

( 8 S°)5d2

( 3 P) 7 /2 17869.878 1.71 35 8P°

4/7

( 8 S°)5d2

( 3 P) 72 17971.595 1.69 33 8P°

4/7

( 8 S°)5d2 ('G) 8G° V2 17987.607 -1.12: 77 72 18001.302 0.94: 75 72 18095.705 1.72: 61

7

/

2

18150.637 1.49 62 72 18319239 1.52 53 u/2 18641.357 1.48 75

18/2 18676.965 1.45 95

is/2 18753.034 1.43 96

4/7

( 8 S°)5d2(

, D) 8 D° 72 18369.326 2.76 66 24 4/7 5d6s

4/7( 8 S°)5d2

( 3 P) 8p° 72 18955.050 2.17 49 72 19223207 1.86 44 72 19401.977 1.65 41

4/ 7( 8 S°)5d2

( 3 F) 6 F

° 11/2 19750.111 1.52 49 72 19946.775 1.55 42 72 20047.344 1.41 67 72 20227.868 1.33 72 72 20369257 1.05 74 72 20453.647 -0.73 75

4/7( 8 S°)5e£2( 3 P) 6P° 72 24H3296 1.73 86 72 24791.510 1.89 91 72 24965.843 2.40 91

4/7( 8 S°)5d2 (‘S) 8 S° 72 29224-352 2.01 98

4/8

( 7 Fe)6pi/2 (6,72)° n/2 32595.348 1.56 96 or 44 ( 7 F) 8 D°

172 32677.540 1.46 92 or 56 ( 7 F) 8 F°

72 33785.507 1.64

11/2 34029.883 1.53

4/8

( 7 Fs)6pi/2 (5,72

)° 72 34108.47

5

1.56 93 or 52 ( 7F) 8 F°

n/2 34608.122 1.45 95 or 33 ( 7 F) 8G°

4/s( 7 F4 )6p 1/2 (4,72)° 72 34900.473 1.62 91 or 59 ( 7 F) 8 F°

72 35541.141 1.45 92 or 44 ( 7F) 8G°
229

Gd II, Odd Parity—Continued

Configuration Term

1 J

Level (cm -1

) 9 Leading percentages

4/8( 7 F6 )6p3/2 (6

,

3

/ 2

)° 13/2 35111.830 1.48 88 or 48 ( 7 F) 8G°

lS/2 35272.546 1.47 100 or 100 ( 7 F) 8G°

n/2 35605266 1.50 99 or 64 ( 7 F) 6 F°

9

/2 36565.693* 1.58 90 or 87 ( 7 F) 6 D°

3

/2 35298.183 2.67

15/2 35362.630 1.50

5/2 35404.833 1.92

9/2 35822.697 1.47

4/8

( 7 F3 )6pi/2 (3.V2)° S/2 35938.545 1.62 93 or 62 ( 7 F) 8 F°

7 /2 36398.500* 1.50 82 or 50 ( 7 F) 8G°

? /2 35991.374 1.55

5

/2 36144-683 1.75

4/8

( 7 F2)6pi/2 (2,V2)° 3 /2 36373.530 1.78 89 or 64 ( 7 F) 8 F°

5

/

36819.318 1.39 99 or 56 ( 7 F) 8 G°

? /2 36632.006 1.58

4/8( 7 F i)6pi/2 (l, l /2)° 1 h 36687.528 2.80 86 or 67 ( 7 F) 8 F°

3

/

37007228 1.19 96 or 59 ( 7 F) 8G°

4/8( 7 F5)6p3/2 (5

3

/ 2

)° ll/2 36723.695 1.47 89 or 46 ( 7 F) 8 F°

13

/ 2 36821.816 1.44 97 or 72 ( 7 F) 6G°

9

/

85 or 46 ( 7 F) 6 F°

7

/

37522.667 1.54 60 or 72 ( 7 F) 6D°

9

/

36778.403 1.44

4/8( 7 Fo)6pi/2 (0,V2)° 1 h 37058.115 -0.27 90 or 66 ( 7 F) 8G°

3

/

37567.768 1.87

4/8

( 7 F4 )6p3/2 (4,

3

/ 2

)° ll/2 37569.531 1.45 90 or 50 ( 7 F) 6G°

9

/

37642.838 1.42 83 or 44 ( 7 F) 8 D°

7

/

75 or 50 ( 7 F) 8 D°

5

/2 68 or 61 ( 7 F) 6 D°

3/2 37632.423 1.99

5

/2 37703.968 1.54 n/2 37831.032 0.89

17

/2 37871.723 1.29

9/2 37992.923 1.45 n/2 38010.603 1.57

9

/ 2 38230.334 1.54

4/8

( 7 F3 )6p3/2 (3,3

/ 2

)° 7 /2 38386.557* 1.39 74 or 36 ( 7 F) 6F°

9

/

38679.364 1.33 86 or 61 ( 7 F) 6G°

5

/2 65 or 62 ( 7 F) 8 D°

3

/

39280.808 1.81 68 or 48 ( 7 F) 6 D°

9

/

38467.016 1.10

9

/ 38555.861 1.20

9

/ 38573218 0.93

7 /2 38877200 1.51
230

Gd II, Odd Parity—Continued

Configuration Term J

Level (cm' 1 ) 9 Leading percentages

4/8

( 7 F2 )6p3/2 (2,

3

/ 2

)° S/2 38922.1*87* 1.30 60 or 27 ( 7 F) ®F°

7 /2 39237448 1.24 80 or 72 ( 7 F) 6G°

3

/

2

55 or 72 ( 7F) 8 D°

l h 67 or 52 ( 7F) 6D°

7 /2 39050.438 1.74

l3/2 39077206 1.43

4/8( 7 Fl)6P3/2 (l,3 /2)° 3

/

2

39367258 1.23 68 or 27 ( 7 F) 6 F°

V2 39610.733 -0.70 63 or 56 ( 7F) 6 F°

5/2 39635.683 1.01 68 or 83 ( 7F) 6G°

5 /2 39543.658 1.69

S/2 39715248 1.75

S

/2 39780.771 1.63

5

/2 39818.862 0.48

4/8

( 7 Fo)6P3/2 (0 3

/2

)° 3

/

2

39936.597 0.16 55 or 92 ( 7 F) 6G°

3

/

2

40024.553 2.32

9

/2 40086.838 1.55

3

/

2

40096.902 2.24

1 h 40244210 -1.08

l /2 40309.427 2.45

5/2 40364.755 1.46

3

/

2

40379.452 0.99

S/2 41142212 1.97

7

/

2

41256.420 1.69

15/2 41284-124 1.44 U/2 41439.557 1.46

•

lS/2 41497.450 1.45

9

/2 41784.500 1.58

11/2 42255.655 1.60 U/2 42289.546 1.46

18/2 42359.716 1.44 n/2 42574.565 0.94

9

/ 2 42626235 1.38

15/2 42636.966 1.44

18/2 42825.332 1.39

11/2 42916.750 1.52 V2 43187.545 — 1.24

S/2 43225224 1.36:

3

/2 43237.460 1.04:

7

/

2

43275.645 1.33 n/2 43279248 1.35

9

/

2

43372.522 1.37

3

/

2

43439.102 1.33

9

/2 43476.925 1.48

7

/

2

43499.711 1.38:
231

Gd II, Odd Parity—Continued

Configuration Term J

Level (cm -1

) 9 Leading percentages

ia/2 43518298 1.48

? /2 43673490 1.30

9/2 43744-110 1.40

i3/2 44197.741 1.40

9

/ 2 45064-987 1.44

9

/ 2 45170.039 1.60

9

/ 2 45185.749 1.59

3

/2 45212.690 0.04

S

/2 45214-658 1.87

5

/2 45394-925 1.09

7

/

45563276 1.24

Gd III ( 9 D5) Limit 97500

Gd II, Even Parity

Configuration Term J

Level (cm-1

) 9 Leading percentages

4/8( 7 F)6s 8 F 13/2 7992.268 1.54 u/2 9092.491 1.51

9

/ 2 10292.567 1.56

7

/ 2 11084.335 1.59

5

/2 11669.863 1.70

3/2 12071.778 1.99 V2 12309.508 3.98

4/8

( 7 F)6s 6F “/a 9943.779 1.50

9

/ 2 11343.525 1.45

7

/2 12318.288 1.41

5

/2 13030.786 1.32

3

/ 2 13515.189 1.08 V2 13800.345 -0.63

4/8

( 7 F)5d 8G 15/2 18366.854 1.46 98

ia

/ 2 18389.122 1.46 72 M/2 18690.096 1.51 56 30 ( 7F) 8F

9

/ 2 19376.999 1.51 56 30

7

/ 2 20098.274 1.44 66 25

5 /2 20631.090 1.32 79

3

/ 2 21005.895 1.01 90 V2 21227.621 -1.22 98

4/8( 7 F)5d 8 D 11/2 20093.245 1.51 56 30 ( 7F) 8G

9

/ 2 20574.163 1.58 50 32 ( 7F) 8G

7

/ 2 21364.923 1.67 48 25 ( 7F) 8G

S

/ 2 23697.401 1.83 53 40 ( 7 F) 8F

3

/ 2 23731.959 2.37 72 25 ( 7F) 8 F

4/8

( 7 F)5d 8 F 15/2 21157.496 1.51 76

5

/2 22062.405 1.86 40 40 ( 7 F) 8 D

“/a 22533.110 1.55 56 32

3

/ 2 22677.320 2.32 64 26

9

/ 2 23025.282 1.58 55 27 V2 23255.821 3.95 98

7 /2 23473.095 1.66 50 40
232

Gd II, Even Parity—Continued

Configuration Term J

Level (cm ') 9 Leading percentages

4/8( 7 F)5d 8 H 17/2 22531.290 1.41 100

15/2 23270.336 1.37 88

13

/ 2 23970.178 1.35 92 “/2 24528.042 1.35 90

9

/ 2 24852.273 1.21 90

7

/ 2 25167.167 1.05 94

5

/ 2 25404.022 0.69 98

3/2 25570.698 -0.36 98

4/8

( 7 F)5d 6 F 11

1

2

24412.685 1.47 90

9

/ 2 25438.335 1.41 85

7/2 26372.991 1.38 86

5

/ 2 27130.397 1.30 90

3

/ 2 27662.215 1.05 94

*/2 27989.933 -0.61 100

4/8( 7 F)5d 6G 13/ 2 25277.136 1.37 94 u/ 2 26639.861 1.32 84

9

/ 2 27546.000 1.28 77

7

/ 2 28220.168 1.20 79

5

/ 2 28790.113 0.34 88

3

/ 2 29146.959 0.05 96

4/8( 7 F)5d 6 H 15/2 25502.560? 1.34 90

l 3

/

2

26931.602 1.33 86 n/ 2 28124.301 1.22 84

9

/

2

28876.600 1.10 86

7 /2 29417.045 0.35 88

5

/

2

29819.766 0.34 94

4/8

( 7 F)5d 8 P 9

/

2

25609.049 1.75 83

7/2 27417.652 1.90 90

5/2 28629.017 2.321 96

4/7( 8S°)6s6p(3 P°) lop 7

/

2

25668.692 2.185 80 12 ( 8S°)5d ( 9 D°)6p 10P

9

/

2

26455.446 1.816 64 15 n/ 2 28502.312 1.75 46 23

4/7

( 8 S°)5d ( 9 D°)6p iop 3 /2 25960.073 3.094 83 15 ( 8S°) ( 9D°) 8 D

5 /2 26211.912 2.171 80 15 ( 8S°) ( 9 D°) 8 D

7

/

2

26595.222 1.863 76 14 ( 8 S°) ( 9 D°) 8 D

9

/

2

27162.224 1.731 72 12 ( 8S°) ( 9 D°) 8 D

n/ 2 27864.534 1.67 51 18 ( 8S°) ( 9D°) 8 D

13

/

2

29353.344 1.61 77 11 ( 8S°) ( 9 D°) 8 F

15

/2 31145.651 1.57 100

4/8

( 5 D3)6s? 6 D?

9

/

2

26351.767 1.61

4/8( 5 D3)6s? 4 D? 7

/

2

27273.505 1.46

4/7

( 8 S°)5d ( 9 D°)6p 10 D 5

/

2

27297.741 2.361 43 29 ( 8S°) ( 9D°) 8P

? /2 27988.074 1.951 37 21 ( 8S°) ( 9D°) 8P

9

/

2

29045.291 1.818 50 23 ( 8S°) ( 9 D°) 8P

11

/ 2 30366.818 1.70 46 22 ( 8S°) ( 9 D°) 8 P

18/2 30996.851 1.65 79 16 ( 8 S°) ( 9 D°) 10 F

4/8

( 7 F)5d 6 D 9

/2 28442.719 1.51 85

7

/

2

28561.734 1.56 73

5/2 29715.817 1.70 85

3

/

2

30403.335 1.90 94

l h 30758.588 3.32 100

4/7( 8 S°)5d ( 9 D°)6p S

/2 29197.887 2.311 43 10 D 38 ( 8 S°)6s6p(3P°) 8P

4/7

( 8 S°)5d ( 9 D°)6p 7

/

2

29242.250 1.950 42 10D 26 ( 8 S°)6s6p(3P°) 8P
233

Gd II, Even Parity—Continued

Configuration Term J

Level (cm' 1 ) g Leading percentages

4/7

( 8 S°)5d ( 9 D°)6p 8 D 3 h 29877.937 2.839 81 16 ( 8 S°) ( 9 D°) 10 F

5

/29965.752 2.040 73 17

7 /2 30008.894 1.832 62 19

9

/2 30027.378 1.78 39 35

4/7( 8 S°)5d ( 9 D°)6p ll/2 30101.366 1.75 41 iop 36 ( 8S°) ( 9 D°) 8 D

4/8

( 7 F)5d 6P 7

/30144.962 1.65 86

5

/2 31237.931 1.84 92

3

/2 31915.795 2.34 98

4/7( 8 S°)6s6p(3 P°) 3 p 9/30849.648 1.784 67 11 ( 8S°)5d ( 9 D°)6p 8 D

4/7( 8S°)6s6p(3 P°) ep 7

/31908.123 1.86 57 28 ( 8S°)(3 P°) 8 P

5

/2 32750.423 1.94 79

3

/2 33181.598 2.35 93

4/7( 8 S°)5d ( 9 D°)6p 8 F l /2 31977.393 3.97 85 14 ( 8S°) ( 7 D°) 8F

3

/32048.837 2.00 83 14 ( 8S°) ( 7 D°) 8 F

5

/2 32150.143 1.81 77 13 ( 8S°) ( 7 D°) 8 F

7

/

32262.787* 1.743 69 11 ( 8S°) ( 7 D°) 8 F

9

/32684.712 1.623 68 10 ( 8S°) ( 7 D°) 8 F

n/2 32946.196 1.55 67 10 ( 8S°) ( 7 D°) 8 F

13

/ 2 33557.951 1.53 74 11 ( 8S°) ( 9 D°) 10 D

4f7

( 8 S°)5d ( 9 D°)6p 5/2 32260.120 2.172 37 8P 23 ( 8S°)6s6p(3P°) 8P

4/7( 8 S°)5d ( 9 D°)6p 7

/

32490.510* 1.791 36 8P 17 (^leseppp0

) 8P

4/7( 8 S°)5d ( 9 D°)6p 9

/

32304.409 1.747 42 8P 25 ( 8S°)6s6p(3 P°) 8P

4/7( 8S°)5d ( 9 D°)6p iop ?/2 33211.481 2.155 80

9

/2 33596.027 1.93 75 U/2 34178.776 1.81 68

4/7( 8S°)5d ( 7 D°)6p 8 D n/2 36461.156 1.58 46 37 ( 8S°) ( 7 D°) 6 F

9

/

36647.241 1.67 64

7 /2 36711.176 1.79 74

5

/2 36845.366 2.030 83

3

/

36995.778 2.745 90

9

/

37845.943 1.50

4/7( 8S°)5d ( 7 D°)6p 9

/

38029.848 1.43 37 6F 36 ( 8S°) ( 7 D°) 6 D

9

/

38057.954 1.14

4/7

( 8S°)5d ( 7 D°)6p 7 /2 38320.173 1.54 35 6F 33 ( 8S°) ( 7 D°) 6 D

11

/ 2 38509.608 1.17

4/7

( 8S°)5d ( 7 D°)6p e F n/2 38553.210 1.48 53 43 ( 8S°) ( 7 D°) 8 D

9

/

39250.737* 1.66 42 21 ( 8S°) ( 7 D°) 8 D

7 /2 39777.217 1.50 43 40 ( 8S°) ( 7 D°) 6 D

5

/

39971.223 1.44 68 23 ( 8S°) ( 7 D°) 6 D

3

/

40091.597 1.19 85 10 ( 8S°) ( 7 D°) 6D

V2 40162.389 -0.43 96

4/7

( 8 S°)5d ( 7 D°)6p 5

/

38628.604 1.66 35 6 D 25 ( 8S°) ( 7 D°) 6F

4/7( 8 S°)5d ( 7 D°)6p 3

/

38828.402 1.83 39 6 D 38 ( 8S°) ( 7 D°) 8 F

225-298 0 - 78-16
234

Gd II, Even Parity—Continued

Configuration Term J

Level (cm-1

) 9 Leading percentages

4/7

( 8 S°)5d ( 7 D°)6p 8 F V2 38934.150 3.53 48 40 ( 8S°) ( 7 D°) «D

13/2 40773.207 1.52 89 10 («S°) ( 9D°) 8F

7 1/2 40785.114 1.53 84

9

/2 40924.927 1.56 74

7 /2 41097.146 1.61 61 21 ( 8S°) ( 7 D°) 6 D

5

/

2

41260.194 1.70 49 37 ( 8S°) ( 7 D°) 6 D

4/7

( 8 S°)5d ( 7 D°)6p 8p 5

/2 39024.491 2.20 49 22 ( 8S°)6s6p( , P°) 8P

7

/2 39170.192 1.83 43 14 ( 8S°)6s6p(‘P°) 8P

9

/

2

39537.159* 1.61 38 30 ( 8S°) ( 7 D°) 6 D

4/8 6s? 4G? ll/2 40888.843 1.31

4/7

( 8S°)5d ( 7 D°)6p 6 D 3/2 41391.647 1.93 50 41 ( 8S°) ( 7D°) 8F

4/7

( 8S°)5d ( 7 D°)6p 6 D V

2

41475.630 3.61 58 36 ( 8S°) ( 7 D°) 8 F

4/7

( 8 S°)5d ( 7 D°)6p ep 7

/

2

42628.167 1.70 90

S

/2 42745.310 1.84 88

3

/

2

42964.576 2.40 89

3

/

2

44358.240 1.91

4/7

( 8S°)6s6p( , P°) 8 P 9

/

2

49053.743 1.77 59 25 ( 8S°)5d ( 7D°)6p 8P

7

/

2

49332.231 1.94 55 31

5

/2 49547.120 2.28 52 37

7 /2 49291.082 1.60

S/2 49497.835 2.10

Gd III ( 9 DS) Limit 97500
235

Gd III

(Sm i sequence; 62 electrons) Z=64

Ground state (ls 2 2s 2 2p6 3s 2 3p6 3d 10 4s 2 4p6 4d 10 5s 2 5p6

) 4/ 7 5d 9 D2

Ionization energy 166400± 800 cm" 1 20.63±0.10 eV

Callahan [1962, 1963] observed this spectrum over the range 1900-11000 A using a mild

spark discharge. His thesis has about 8200 lines assigned to Gd ill, with the “largest

concentration” of the lines lying in the region 2100-3200 A. Kielkopf [1969] also measured

thousands of Gd lines in connection with his investigation of Gd iv, and his thesis gives the

stronger Gd in lines from 1720 to 6000 A. The line lists of Callahan and Kielkopf differ

considerably with regard to particular spectra in some regions. Both lists have many lines experimentally assigned to Gd hi that are now known to belong to Gd n.

Callahan’s analysis of the 4/ 7

( 8 S°)5d6p and 4/ 7

( 8 S°)6s6p transitions in Gd in classified 42 lines (2043-3177 A) and yielded all the 4/ 7

( 8 S°)5d,6s, and 6p levels [Callahan, 1963].

Johansson and Litzen [1973] found the 4/ 8 7 F levels by observing and classifying eight lines of

the 7 F —7 D° multiplet in the infrared (1.43 —2.56 p.m). Kielkopf [1976] has reevaluated the

Gd ill levels, taking his own wavelength determinations into account. He supplied the values

given here except for the two 4/ 7 ( 8 S°)7s levels, which were recently located by Wyart [1976].

The eigenvector percentages, which are from Callahan [1963], are based on the assumption

of a pure 4/ 7

( 8 S°) core state. As he remarks, the actual purity of this state is about 97%.

The ionization energy is from Sugar and Reader.

References

Callahan, W. R., Thesis, Johns Hopkins Univ., Baltimore, 117 pp. (1962). EL CL W PT

Callahan, W. R., J. Opt. Soe. Am. 53, 695 (1963). EL CL W PT

Johansson, S., and Litzen, U., Phys. Ser. 8, 43 (1973). EL CL W

Kielkopf, J., Thesis, Johns Hopkins Univ., Baltimore, 121 pp. (1969). W

Kielkopf, J., unpublished material (1976). EL

Sugar, J., and Reader, J., J. Chem. Phys. 59, 2083 (1973). IP Wyart, J. F., private communication (1976). EL

[July 1976]

Gd ill

Configuration Term J

Level (cm -1

) Leading percentages

4/7

( 8 S°)5d 9 D° 2 0.00 99 1 ( 8S°) 7 D°

3 279.32 98 2 4 69^.37 98 2 5 1310.13 97 3 6 2282.83 100

4/8 7 F 6 2381.24 5 3996.71

4 5015.20 3 5789.97 2 6334.17

10

4/7( 8 S°)6s 9go

4 9195.04
Gd III

Continued

Configuration Term J

Level (cm -1

) Leading percentages

4/7

( 8 S°)5d 7 D° 5 9356.30 97 3 ( 8 S°) 9D°

4 9717.70 98 2 3 1001 U.7

5

98 2 2 1023U-U9 99 1 1 10387.30 100

4/7( 8 S°)6s 7 S° 3 115A9.50

4/7

( 8 S?/2 )6pi/2 ( 7 /2,*/2) 3 43019.99 98 2 ( 8S?/2) ( 7

/2,3

/2) 4 43611.69 95 5

4/7( 8 S7/2)6p3/2 ( 7

/2,3

/ 2) 5 47233.93 100 4 48339.14 95 5 ( 8S?/2) ( 7 /2,V2) 3 48859.62 98 2 2 49194.70 100

4/7( 8 S°)7s 9 S° 4 8775LA

4/7( 8 S°)7s 7 S° 3 8856372

Gd iv ( 8 S?/2 ) Limit 166A00
237

[Gd IV]

(Pm i sequence; 61 electrons) Z~64

Ground state (ls 2 2s 2 2p fi 3s 2 3p6 3d’°4s 2 4p6 4d’°5s 2 5p'i ) 4f

1 8 S°/2

Ionization energy 355000± 6000 cm ’ 44.0± 0.7 eV

Kielkopf [1969] observed the Gd spark spectra using a pulsed hollow-cathode source. The

line list in his thesis includes the strongest lines experimentally assigned to Gd iv in the region

1265-6000 A, with most such lines lying below 2500 A. The levels from a preliminary analysis

of Gd iv by Kielkopf and Crosswhite [1970] are omitted here, pending confirmation by further

work on this spectrum [Kielkopf and Crosswhite, 1976].

Some of the research on the spectra of the Gd3+ ion in crystal hosts is summarized in Dieke’s book [1968]. Absorption transitions from the 4/ 7 8 S°/2 ground level to levels of several

upper 4f

1 terms have been identified. Only the lowest excited term, 6 P°, is given here; the

levels are averages of the corresponding sublevels of the ion in a LaCl3 host crystal [Piksis,

Dieke, and Crosswhite, 1967], rounded off to the nearest 10 cm"’. Crosswhite [1976] furnished

the eigenvector percentages from a new calculation of this configuration.

In deriving the quoted ionization energy, Sugar and Reader [1973] used a value of 91200

cm"' for the lowest level of the 4/ 6 5d configuration. Most of the uncertainty given for the

ionization energy here arises from the uncertainty in this 4/ 7 -4/6 5d energy difference

[Spector and Sugar, 1976],

References

Crosswhite, H. M., unpublished material (1976). PT

Dieke, G. H., Spectra and Energy Levels of Rare Earth Ions in Crystals, Ed. H. M. Crosswhite and H. Crosswhite, pp. 249-253 (Interscience Publishers, New York, 1968). [EL] [CL] [W]

Kielkopf, J. F., Jr., Thesis, Johns Hopkins Univ., Baltimore (1969). EL CL W PT

Kielkopf, J. F., and Crosswhite, H. M., J. Opt. Soc. Am. 60, 347 (1970). EL ND CL W

Kielkopf, J. F., and Crosswhite, H. M., private communication (1976).

Piksis, A. H., Dieke, G. H., and Crosswhite, H. M., J. Chem. Phys. 47, 5083 (1967). [EL] [CL] [W] PT

Spector, N., and Sugar, J., J. Opt. Soc. Am. 66, 436 (1976). Sugar, J., and Reader, J., J. Chem. Phys. 59, 2083 (1973). IP

[July 1976]

[Gd iv]

Configuration Term J

Level (cm -1

) Leading percentages

4/7 8 S

° 7 /2 0 97 3

6P°

4/7 ep° 7 /2 [32120] 75 13 6 D°

5

/[32720] 82 14

3

/2 [33290] 90 8

Gd V ( 7 Fo) Limit 355000
Gd XXXVII

(Ni i sequence; 28 electrons) Z=64

Ground state (ls 2 2s 2 2p6 3s 2 3p6

) 3d 10 'So

Burkhalter, Nagel, and Whitlock excited this spectrum in the region 5-15 A by focusing

light from a pulsed laser onto a Gd target. They classified the 3d 10 'S0 —3d9 4p(J=l) and

3d 10 ’S„— 3d9 4/(J=l) resonance lines by comparison with calculations and by use of

isoelectronic regularities. The levels listed by Burkhalter et al. have been converted to units of

10 4 cm -1 (equivalent to 1.23985 eV).

Cowan has also calculated these configurations, and the leading percentages are from his results. The levels of both excited configurations are listed with decoupling designations,

with alternative LS names and percentages shown for the 3d l0 4/(J=l) levels. Burkhalter et al. note that the line classified as 3d 10 'S0 —3d9 4p (%,V2 )° is too strong to belong entirely to Gd xxxvil; following a suggestion of Burkhalter we list the corresponding

upper level as tentative. Burkhalter also supplied the tentative level at 1129X104 cm 1 (1400

eV) as being a more probable position for 3d9 4/( 5

/2, 5/2)° than the published tentative value of

1376 eV.

References

Burkhalter, P. G., private communication (1975). EL CL

Burkhalter, P. G., Nagel, D. J., and Whitlock, R. R., Phys. Rev. A 9, 2331 (1974). EL CL W

Cowan, R. D., unpublished material (1975). AT

[July 1976]

Gd xxxvil

Configuration Term J

Level

(10 4 cm-1

) Leading percentages

3d10 ‘S 0 0.0

3d9

( 2 D3/2)4pi/2 ( 3

/2,

1 /2)° 1 9in 99

3d9

( 2 D5/2)4p3/2 (5

/2,3/2)° 1 930 98

3d9

( 2 D3/2)4p3/2 ( 3

/2,3 /2)° 1 955 99

3d9

( 2 Ds/2)4/5,2 ( 3

/ 2, 3

/ 2>° 1 11291 90 or 77 3P°

3d9

( 2 Ds/2)4/7/2 ( 5

/2,

7 /2)° 1 11W 72 or 64 3 D°

3d9

( 2 D3/2)4/s/2 ( 3

/2,5 /2)° 1 1171

O

(N U 00 00 O
TERBIUM

Tb I

65 electrons Z=65

Ground state (ls 2 2s 2 2p6 3s 2 3p6 3d 10 4s 2 4pfi 4c(

10 5s 2 5p6

) 4/ 9 6s 2 6 H°5/2

Ionization energy 47295±5 cm-1 5.8639±0.0006 eV

Identified odd configurations 4/ 9 6s2

, 4/ 9 5d6s?, 4/ 8 6s 2 6p, 4/ 8 5d6s6p, 4/ 8 5d 2 6p?, 4/'96s7s

Identified even configurations 4/ 8 5d6s 2

, 4/ 8 5d2 6s, 4/ 9 6s6p

Main References for Wavelengths, Energy Levels, and g Values

The most complete description of this spectrum has been obtained by Klinkenberg [1966],

whose original unpublished list had about 30000 Tb I and Tb ii lines over the region 2335-9285

A. The wavelengths were derived from spectrograms of electrodeless-discharge sources photographed at the Argonne National Laboratory. The analysis of the Tb I spectrum at the

Zeeman Laboratory, Amsterdam, is described in the papers of Klinkenberg [1964; 1966; 1967;

1972a], Klinkenberg and Meinders [1966; 1969], Meinders and Klinkenberg [1968], and

Klinkenberg and van Kleef [1970]. The measurements were extended photographically to 11650

A, and later to 2.4 /xm by Verges at Orsay using the SISAM technique [Klinkenberg, 1972a].

Most of the above references include an extensive list of classified lines; by 1972 some 5400

Tb i lines had been assigned as transitions between 451 high odd levels and 46 low even levels (the “A” system) [Klinkenberg, 1972a].

The energy levels in the papers of Klinkenberg and his collaborators are given with

respect to a value of 0.000 cm 1 for the lowest level of the “A” system, 4/ 8

(

7 F)5d6s 2 8 G 13/2 . In 1970 Klinkenberg and van Kleef determined that this level lay 285.58 cm"1 above the ground

level of Tb I, 4/ 9 6s 2 6 H°5/2 . The value of this connection between the “A” and “B” systems has

recently been more accurately determined as 285.500±0.005 cm 1 [Blaise and Verges, 1976], The

great majority of the levels given here are from a list furnished by Klinkenberg [1972b],

adjusted to the new value for the connection. Most of the levels are given to two decimal

places only, with some low levels being given to the nearest 0.005 cm"1 as in the original lists. Some additional levels and g values, as well as a few revisions, are from recent work at Laboratoire Aime Cotton, Orsay, and at Amsterdam [Blaise and Verges, 1976, 1977; Klinkenberg,

1976, 1977; some of the recent results for Tb I are described in the compilation by Blaise,

Camus, and Wyart, 1976]. New measurements of the Zeeman effect [Klinkenberg, 1976, 1977]

and of the infrared spectrum by means of Fourier spectrometry [Blaise and Verges, 1976]

have been carried out, and the analysis is being continued.

The main observations of the optical Zeeman effect for Tb were made by Davis [1960] and

by Klinkenberg and his coworkers [Klinkenberg, 1966; Meinders and Klinkenberg, 1968].

Klinkenberg and collaborators derived most of the approximately 450 g values given here,

many of which have not previously been published [Klinkenberg, 1977], The accuracy of most

of the three-place values (usually given to the nearest 0.005) and two-place values is limited by

hyperfine structure. The 1964 paper by Bender, Penselin, and Schliipmann gave J and g values

for five low levels of Tb I as determined by the atomic-beam magnetic-resonance technique.

The five-place g values listed here for the three lowest odd levels and 14 lowest even levels are from the magnetic-resonance measurements of Childs [1970], who extended the earlier

work on hyperfine structure in Tb I by Childs and Goodman [1969]. The uncertainty of most of

these values is two to four units in the fifth place, the main exception being an uncertainty of

three units in the fourth place for the 4/ 8

( 7 F)5d6s2 8 G 1/2 level.
240 Tb I —Continued

Worden, Conway, Paisner, and Solarz [1977] observed high series members in Tb I using a stepwise laser photoionization technique. These data became available too late for inclusion

here, but the quoted ionization energy was determined from the new series.

Theoretical Interpretation

Details of the steps in the analysis of this spectrum are given in the papers of

Klinkenberg and his coworkers. Their interpretation began with the identification of the low even terms, and this complex group constitutes the best understood portion of the known

structure. Arnoult and Gerstenkorn [1966] and Spector [1970] calculated the 4/ 8

(

7 F)5d6s 2 subconfiguration. The 4/ 8 5d6s2 eigenvector percentages given here are from the recent

calculation by Bauche-Arnoult, Sinzelle, and Bachelier [1977], who constructed the matrices for

the complete configuration. Our arrangement of the lower even levels into term groups of

4/ 8

( 7 F)5d6s 2 excludes only the J=9h level at 1371 cm -1

, but it should be noticed that several of

the levels included in the three lowest terms have no really satisfactory designations:

particular examples are the nominal 8 G 11/2 , 8 D 11/2 , 8 G9/2 , 8 D;W2 , and x F8/2 levels. The designations

of a few levels have been changed to conform better with the new and more accurate

eigenvectors.

Klinkenberg and Meinders [1969] were able to extract the levels of a 4/ 8 5d2 6s 10 G term

beginning at 8190 cm -1

, and some other assignments to higher even terms have been made or suggested [Klinkenberg, 1972a, 1976; Blaise and Verges, 1976, 1977]. A number of designations are given tentatively, pending calculations of the complex (4/

8 5d6s 2 +4/ 8 5d2 6s) group. The

eigenvector compositions of many of these levels are certain to be very mixed in any coupling

scheme. The levels assigned to the important upper even group 4/ 9

( 6 H°)6s6p are designated in a J X J 2 coupling scheme [Klinkenberg and van Kleef, 1970], Sugar [1962] classified three of the

strongest Tb I lines as resonance transitions from three of these levels to the 4/ 9 6s 2 6 H°5/2 level, but the correct configurational assignment and extension of the upper even group was

accomplished by Klinkenberg and van Kleef with much more extensive data. The development and interpretation of the system of lower odd levels is less complete

than for the even group, and interpretation of the extensive group of high odd levels has

hardly begun [Klinkenberg, 1971]. Conway and Wybourne [1963] gave eigenvectors for the

lowest three levels of the 4/ 9 6s 2 6 H° ground term; the leading percentages here are from a more recent calculation by Crosswhite [1976].

Klinkenberg [1972a] and Spector [1971] have discussed the identification of the

4/ 8(

7 F)6s 2 6p levels, some designations of which are given here in the J x j coupling scheme

considered by both authors. Some additional assignments to the 4/ 8 (5d+6s)2 6p group or to 4/ 9

( 6 H°)5d6s are listed tentatively, pending calculation of the important odd configurations

[Klinkenberg, 1976; Blaise and Verges, 1976, 1977; see Blaise, Camus, and Wyart, 1976].

References

Arnoult, C., and Gerstenkorn, S., J. Opt. Soc. Am. 56, 177 (1966). Hfs PT

Bauche-Arnoult, C., Sinzelle, J., and Bachelier, A., J. Opt. Soc. Am., in press (1977). Hfs PT

Bender, I., Penselin, S., and Schliipmann, K., Z. Phys. 179, 4 (1964). ZE

Blaise, J., Camus, P., and Wyart, J. F., in Gmelin Handbuch der Anorganischen Chemie, Vol. 39, Part B4 (SpringerVerlag, Berlin, 1976). EL ND CL ZE Hfs

Blaise, J., and Verges, J., unpublished material (1976, 1977). EL ZE

Childs, W. J., Phys. Rev. A 2, 316 (1970). ZE Hfs

Childs, W. J., and Goodman, L. S., J. Opt. Soc. Am. 59, 875 (1969). ZE Hfs Conway, J. G., and Wybourne, B. G., Phys. Rev. 130, 2325 (1963). PT

Crosswhite, H. M., unpublished material (1976). PT

Davis, S. P., Astrophys. J. 132, 486 (1960). ZE Hfs

King, A. S., Astrophys. J. 72, 221 (1930). W Hfs

Klinkenberg, P. F. A., Z. Phys. 180, 174 (1964). EL ZE

Klinkenberg, P. F. A., Physica (Utrecht) 32, 1113 (1966). EL CL W ZE

Klinkenberg, P. F. A., Physica (Utrecht) 37, 197 (1967). EL CL W ZE

Klinkenberg, P. F. A., Physica (Utrecht) 57, 594 (1972a). EL CL W ZE

Klinkenberg, P. F. A., unpublished material (1972b, 1976, 1977). EL ZE

Klinkenberg, P. F. A., and Meinders, E., Physica (Utrecht) 32, 1617 (1966). EL CL W ZE

Klinkenberg, P. F. A., and Meinders, E., Physica (Utrecht) 42, 213 (1969). EL CL W ZE

Klinkenberg, P. F. A., and van Kleef, T. A. M., Physica (Utrecht) 50, 625 (1970). EL CL W ZE

Meinders, E., and Klinkenberg, P. F. A., Physica (Utrecht) 38, 253 (1968). EL CL W ZE

Spector, N., J. Phys. (Paris) Colloq. C 4 31, 173 (1970). PT
Tb I —Continued 241

Spector, N., J. Opt. Soc. Am. 61, 1350 (1971). ND

Sugar, J., J. Res. Nat. Bur. Stand. (U.S.) 66A, 321 (1962). CL

Worden, E. F., Conway, .1. G., Paisner, J. A., and Solarz, R. W., unpublished material (1977). IP

[March 1977]

Tb I, Odd Parity

Configuration Term J

Level (cm -1

) 9 Leading percentages

4/

9 6s

2 6 H° 15/2 0.000 1.32513 95 4

4 I°3

13/2 2771.675 1.27625 97 2

4 I°3 n/2 Ii670.1f55 1.20610 93 2

6 F°

9

/

61 71^.925 95 2

4G°4

7

/

94 3

4G°4

5

/

93 4

4G°4

4/8

( 7 F6)6s2 6pi/2 (6.V2)

0 n/2 1361627 1.555

1S/2 13622.69 1.45

4/8( 7 F)5d6s6p? 10H°? 1S/2 14998.90

4/9

( 6 H°)5('/6.s? 15/2 15098.95

4/8( 7 F)5rf6s6p? U/2 1518923 1.590

4/8( 7 F)5t?6s6p? 10H°? 15

/2 15201.02 1.48?

4/8( 7 Fs)6s2 6pi/2 ? (5//2)

0 ? ®/2 15339.73 1.57 u/2 15953.66 1.47

4/8

( 7 F)5c/6.s‘6p? 10 H°? 17

/2 15798.64

4/8( 7 F)5d6s6p? 9

/

15825.17 1.62

13

/2 16043.56 1.370

4/8

( 7F)5d6s6p? ! 5/2 16051.64 1.475

4y8(7 F6)6s2 6p3/2? (6, 3

/ 2 )°? 18/2 1628623 1.430

7

/

16453.50 1.63 n/2 16543.94 1.535

4/’ 8

( 7 F6 )6.s 2 6/13/2? (6,

3

/2 )°? 15/2 16719.01 1.35

7

/

16722.56 1.590

4/

8 5c/6s6p? 13

/2 1705222 1.52 n/2 17118.72 1.50

9

/ 2 17162.53 1.44

5

/2 17293.33 1.69

13

/2 17341.92 n/2 17350.98 1.340

4/8

( 7 F)5rf6s6p? i°H°? 19

/ 2 1740122

4/

8 5d6s6p? 15

/2 17409.62 1.55

9

/ 2 17417.01 1.660

13

/2 17441-07

5

/2 17560.82 1.56 4/

8 fx/6.s 6p? n/ 2 17740.60 1.64

9

/

17753.38 1.520

4/

8 5d6s6p? 17

/2 17932.42 1.51

4/8( 7 F2)6s

2 6pi/2 ? (2,V2)°? 3

/ 2 17936.55 1.78

4/

8 5d6s6p? 15/2 18043.09 1.48
242

Tb I, Odd Parity—Continued

Configuration Term J

Level (cm ') 9 Configuration Term J

Level (cm ') 9

7

/2 18120.77 1.56 7

/2 20032.52 1.4 4/

8 5</6s6p? 13/2 18135.88 1.46 9

/2 20035.06 1.513 n/2 18182.98 1.47 5/2 20042.63 1.398

3/2 18192.91 1.480 ,3

/2 20140.04

7

/2 18260.38 1.48 n/2 20250.48 n/ 2 18343.68 1.45 13/2 20306.01 4/8

( 7Fi)6s2 6pi/2 ? (l, 1 /*)

0? v2 18397.56 2.35 ll

/2 20373.50 1.540 4/ 9 5d6s? 15/2 18410.55 9

/2 20435.91 1.414 4/

8 5c/6s6p? ll

/ 2 18461.87 1.555 7/2 20473.43 1.73

9

/2 1849720 1.465 U/2 20534.69 1.47

*/2 18572.92 0.51 S

/2 20606.69 1.205 4/

8 5</6s6p? 13/2 1860724 1.48 9

/

2

2062626 1.42

9

/ 2 18611.47 1.38 ?

/2 20684.03 1.44

9

/ 2 18645.50 1.54 3

/ 2 20688.02 1.065

5

/ 2 18709.99 1.596 15/2 20700.64 1.42

13/2 18805.02 1.435 4/

8 5d6s6p? 10J°? U/2 20750.70 1.39

9

/ 2 18850.90 1.310 ?/2 20762.60 1.675

15/2 18881.74 1.46 13/2 20793.11 1.53 u/2 1888227 1.44 U/ 2 20796.05 1.45

S

/2 18915.43 1.385 3/2 20823.35 1.99

?

/ 2 19025.06 1.54 13/2 20928.12 1.43 4/

8 5o?6s6p? 15/2 19080.13 1.48 13/2 20989.87

3

/2 19108.85 1.75 5

/2 21004-78 1.668 4/

8 5rf6s6p? 17/2 19131.45 1.41 4/

8 5</6s6p? 15/2 21083.72 1.525

9

/ 2 19155.06 1.600 9

/2 21130.59 1.708 4/

8 5d6s6p? 17/2 1916231 1.30 U/ 2 21197.15 1.30

13/2 19269.98 1.35 13/2 21217.93 1.45

3

/ 2 19276.50 1.065 7/2 21223.58 1.70

7/2 19310.33 1.584 3/2 21282.61 1.79

X / 2 1931320 3.50 4/9 5rf6s? 17

/2 2132437

15/2 2139731 1.45 “/* 1931728 1.36

7

/

2

21422.05

4/

8 5d6s6p? u/2 19332.48 1.52 U/ 2 21479.41 1.40 v2 19421.90 -1.06

3/2 2149623 1.401

9

/ 2 19450.45 1.58

9

/2 21518.77

15/2 19598.19 1.40

ll

/ 2 21673.72 1.422 4/

8 5rf6s6p? 13/2 19606.52 1.54

S

/ 2 2167930 1.69

13/2 19658.41 1.455

7/2 21729.64 128

4/

8 5rf6s6p? 9

/ 2 19691.12 1.650

3/2 21731.92 1.99

7/2 19694.70 1.422 1* 21772.73 1.67

5/2 19759.83 1.90

15/2 21812.08 1.43 H/2 1978123 1.43 21837.92 1.43

1.52 4/

8 5d6s6p? 17/2

?

/2 19901.15

13/2 2185433 1.35

7

/2 1994134 1.46 U/ 2 21872.93 1.44

11 /2 19958.55 1.508
243

Tb I, Odd Parity-Continued Tb »• °dd Parity-Continued

Configuration Term J

Level (cm 1 ) 9

Configuration Term J

Level (cm ’) 9

S/2 21879.38 220 4/8 5d6s6p!

1S/2 23464-78 1.43

9

/2 21887.16 1.355 5

/ 2 23487.88 2.05

4/8 5d6s6p?

10

J °? 21/2 21946. 46'! S

/2 23492.50

”/2 21987.34 1.58 9

/2 23519.94

9

/2 22011.12 1.33 13/2 23689.81 1.36

15/2 2208434 1.490 13/2 23720.34 1.48

3

/2 22178.66 2.345 9

/ 2 2372523 1.40

5

/2 22183.77 1.37 3

/2 23756.97 1.50

9

/ 2 22202.52 1.634 17

/ 2 2379722

13

/2 22222.58 13

/2 23847.54 1.33

is

/2 22223.87 1.375 15/2 23889.75 1.38 V2 22264.59 3.620 1S/2 2390728 1.42

ll

/2 22278.93 ll

/ 2 23951.55 1.49

4/ 8 5d6s6p?

8I°? 19

/2 22311.58 1.41 9

/

2395726 1.59

9

/2 22327.98 1.45 13/2 24003.73 1.44

13/2 22382.12 1.36 7

/

24032.11 1.50

5

/2 22394.69 1.910 13

/2 2404929

13/2 22492.98 1.44 7/2 24075.69 1.32 U/2 22524.15 15/2 24085.58 1.35

7/2 22556.78 1.69 13/2 24088.51 1.38

3

/ 2 22617.87 1.78 9

/2 24092.09

13

/2 22644.55 17

/2 24188.61

9

/2 22663.07 1.34 13/2 24243.36 1.38

S

/2 22706.51 1.515 3

/ 2 24271.04 1.28

IS/2 22727.88 15/2 24325.67 1.397

17/2 22736.76 1.42 9

/ 2 2436328 1.31

ll

/ 2 22754.99 U/ 2 24392.79 1.335

ll

/2 22830.55 3/2 2442032 1.528

15/2 22838.79 ”/2 24438.71 1.08

9

/2 22842.94 1.41 3

/2 24443.57 1.816

3

/2 22868.81 1.950 9

/2 24481.11 1.49

5/2 22927.63 1.452 n/2 24490.95 124

?/2 22933.38 1.155 3

/2 24551.64 1.38

11

1

22959.01 1.50 9

/2 24557.68 1.45

9

/ 2 23019.01 5/2 24613.87 1.80 n/ 2 23103.41 1.52 15/2 24636.94 1.403

9

/2 23191.65 15

/2 24638.54 1.38

15/2 23213.87 1.38 u/ 2 24658.90 1.40

13/2 23248.17 U/2 24701.62 1.38

*/2 23248.96 3.555 15/2 24769.12 1.32

ll

/ 2 23394.47 1.47 9

/ 2 2477529 1.49 U/2 23425.83 1.46 1J /2 2481921 1.36

11 h 2343826 1.44 13/2 2482489

5

/2 2345534 1.98 9

/2 24843.50
244

Tb I, Odd Parity—Continued Tb I, Odd Parity—Continued

Configuration Term J

Level (cm '*) g Configuration Term JLevel (cm -1

) 9

17/2 21/391.99 n/2 26297.75 1.27

!5/2 2493839 1.539

/ 9

/2 2630135 1.469

9

/2 25014.66 1.28 13

/

2

26318.00

7

/ 2 25045.93 1.35 n/2 26334.67 1.48

9

/ 2 25065.78 1.45 13

/ 2 26385.99

15

/2 2507626 1.42 7/2 26394.48 1.40

13/2 25122.34 1.374 3/2 26403.01 1.35

11

/2 25131.17 1.42 U/2 26411.89 1.24

7

/

2

25134.81 1.42 U/ 2 26438.75 1.44

13/2 25210.80 9

/

2

2644133 1.75

11 h 25211.61 1.41 13

/ 2 26488.10

9

/

2

25226.69 1.40 X1 /2 26521.43

7

/

2

25241-44 1.73 7

/

2

26522.48 1.87

3

/2 25340.54 9

/ 2 26580.61 1.27

9

/

2

25348.99 1.38 13

/2 26584.75 1.36

13

/2 25393.16 1.28 7

/

2

26594-05 1.67

7

/

2

25433.81 1.045 7

/

2

26668.76 1.35

5/2 25476.12 9

/

2

26673.59 1.40

9

/ 2 25509.79 1.29 15/2 26708.32

9

/ 2 25584.72 1.41 5

/2 26728.63 1.21

7

/

2

25652.48 1.38 9

/

2

26757.16 1.25

5

/2 25676.81 0.74 13/2 26787.51 1.60

18/2 25724-41 7

/

2

26792.54 n/2 25753.40 1.12 J1 /2 26808.33 1.54

5

/2 25782.97 1.14 V2 26858.68 -0.400

13/2 25806.10 1.54 U/2 26916.91 1.31 n/2 2581828 1.45 13

/ 2 26950.31 n/2 25859.31 9

/

2

26966.53 1.695

9

/

2

25859.83 1.39 13/

2

26973.81 1.38

7

/

2

25908.59 1.46 n/2 27019.91 1.200

9

/

2

26006.65 1.37 9

/

2

27023.13 1.39

13

/2 26043.00 1.44 3/2 2702522 1.45

7

/

2

26051.19 1.37 13/2 27046.18

l 3

/2 2608625 1.3 H/2 27061.52 4/8 5rf6s6p? 17/2 26087.13 1.406 9

/2 27102.94 U/2 26091.79 1.30 9

/

2

27152.53 1.34

15/2 26097.92 1.31 15/2 27154-07 1.26

9

/ 2 26118.30 1.192 n/ 2 27220.46 1.37

7

/ 2 26123.52 1.59 7

/

2

27259.08 1.44

13

/2 26157.32 1.32 13/2 27295.14 1.36

3

/

2

26231.14 1.66 3/2 27308.16 0.08 n/2 26240.55 1.54 9

/

2

27314-12 1.34

13/2 26253.55 13/2 27344-14 1.27

7

/

2

2628029 1.38 5/2 2735522 1.275
245

Tb I, Odd Parity—Continued Tb I, Odd Parity—Continued

Configuration Term J

Level (cm^ 1 ) 9 Configuration Term J

Level (cm *) g

4/8

5t/2 6p? 13/2 27399.10 1.43 3/2 28425.93 0.39 h/2 27402.68 1.38 V2 28453.45 3.14

is/

2 27420.09 1.406 3/2 28456.91

9/2 27450.52 1.38 15/2 28488.40 1.34

4

a 5d2 6p? 17/2 27458.75 1.365 11

/ 2 28500.52

15/2 27473.13 1.39 7

/

28503.79 1.32

ll/2 27492.32 1.41 3/2 28508.80 1.58

S/2 27525.58 1.21 13/2 28518.76 1.32

13/2 27528.34 1.61 9

/

28522.59 1.57

7/2 27531.99 1.26 n/2 28553.97 1.37

ll/2 27576.77 1.42 5/2 28585.93 1.78

9

/27581.87 1.32 ?/2 28605.10 1.27

4/" 8 5o?2 6y0? 15/2 27611.74 1.42 3/ 2 28670.03 1.40

3

/2 27633.57 1.805 3/2 28683.95 1.65

13

/2 27664.77 1.20 7

/

28759.89 1.64

3

/2 27684.64 1.52 9

/

28781.76 1.38

l 3

/2 27698.95 1.29 9

/2 28860.49 1.7

5/2 27758.18 1.18 13/2 28890.24 1.500

l 3

/

27833.58 9

/2 28916.53

13

/ 2 27848.42 1.32 u/2 28919.14 1.48

7

/

27914.33 1.42 n/2 2897123

4/8 5d2 6p? 9

/

27923.11 1.54 11

/2 28971.64 1.41

13/2 27935.09 1.39 9

/

28989.47

13/2 27941.95 7

/

29041.65 1.77

9

/

2795226 Va 29064.13 1.79

ll/2 27959.07 1.24 13

/ 2 29103.40

3

/2 27964.82 1.25 9

/

29126.41 1.400 H/2 27991.54 3/2 2920426 1.46

9

/2 28048.09 1.32 9

/2 29210.56 1.46

ll/

2 28065.44 1.42 n/2 29244-64 1.370

5/2 28070.33 1.08 l7

/ 2 29306.28

13/2 28096.73 n/2 29326.10

5

/2 28156.97 1.54 7

/

29366.03 1.40 n/2 28188.70 15/2 29388.78 1.385 4/8 5d

2 6p? 17

/

28193.17 1.40 19/2 29391.66

7

/

2822024 1.28 3/2 29399.99 1.13

7

/

28306.08 1.81 9

/

29433.01 1.41

ll/2 28315.50 9

/

29465.99 1.46

9

/

28318.45 1.35 S

/2 29483.46 1.32

7

/

28358.13 1.36 13/2 29543.01 1.40

13/2 28372.18 7

/

29577.08 1.340 U/2 28417.42 n/ 2 29613.14

9

/2 28420.95 1.46 n/ 2 2963828 1.39

7/2 28421.89 1.42 i3/2 29702.72 1.48
246

Tb i. Odd Parity—Continued Tb I, Odd Parity—Continued

Configuration Term J

Level (cm *) 9 Configuration Term J

Level (cm -1

) 9

9

/2 29726.86 11/2 31221.87 u/2 29727.09 1.42 S

/2 3130725

7

/

2

29729.83 1.610 7/2 3133325 1.44 U/2 29737.61 1.50 9

/

2

31366.57 1.40

3

/2 2976946 0.42 n/2 31400.97 1.39

3

/2 29831.99 1.16 15/2 31406.00 1.32

15/2 29859.73 9

/2 31477.50 1.41 n/2 2986127 1.37 5

/2 3148028

13/2 298672k 1.36 7/2 31492.90

7/2 29920.10 1.49 13

/2 31542.01 1.43?

11/2 30054-07 1.35 15/2 31563.57 1.56

11/2 3005822 9

/

2

31576.16

4/8 5d

2 6p?

15/2 30068.35 1.43 5

/2 31595.48

4/9

( 6 H°)6s7s

i 7

/2 30095.53 19

/2 31613.90

9

/2 30212.12 1.37 n/2 31695.19 1.41

5

/2 30253.95 1.590 5

/2 31706.41

7

/

2

30272.65 1.23 9

/

2

31715.80 1.325

19/2 3035822 13/2 31800.43

l 3

/

2

30125.08 9

/2 31859.31 1.45

7

/

2

30410.

U

1.2 7/2 31901.42 1.34

7/2 30437.06 1.33 3

/

2

31967.40 1.46

9

/

2

30546.75 1.37 15/2 32015.99 1.91

13/2 30550.07 1.66 5

/2 32071.19 1.352

15/2 3057726 7/2 32158.93 1.59

9

/2 30598.84 1.36 9

/2 32163.47 1.37

4/9(6 H°)6s7s 15/2 30607.47 5/2 32217.55 1.375

9

/2 30643.49 1.27 S

/2 32269.95

5

/

2

30647.81 1.51 S

/2 32516.84 1.330

17/2 30666.00 7

/

2

3258324 1.41

7

/

2

3068026 1.41 13/2 32605.35 1.5

11

/2 30695.07 1.355 5

/2 32643.88 1.370

9

/

2

30698.72 1.35 u/2 32656.68 1.55

3

/ 2 30774.74 1.740 7

/

2

32749.98 1.405

9

/

2

30789.68 1.07 S

/2 32787.16

13/2 30825.57 1.41 S

/2 32829.70

3

/

2

30852.95 n/2 32832.09 1.53

11/2 30916.01 n/2 32911.90 V2 30928.77 1.685 5

/2 3296121

13/2 30947.95 1.5 23

/2 33051.16

15/2 30958.07 U/2 33151.06

5

/2 30969.15 m/2 33293.14 n/2 30976.92 1.51 19

/2 33307.42

7

/ 2 31093.42 1.5 3

/2 33348.70

5/2 31131.43 1.31 U/2 33454.94
247

Tb I, Odd Parity—Continued Tb I, Odd Parity—Continued

Configuration Term J

Level (cm' 1 ) 9

Configuration Term J Level (cm ') 9

n/2 33568.03 1.52 9h 34139.40

9h 33638332 1.53 13/2 34150.86

2i/2 33669.32 21/2 34223.95 V2 33696338 3.880 7/2 3444721 1.76

7/2 33727.01 19/2 3461623

9

12 33771.57 1.46 19/2 34999.92

n/2 33839.15 1.60

S

/2 34114-89 1.638 Tb II ( 6H?5/2)6si/2 ( 1S

/2, 1 /2)8 Limit 47295

Tb I, Even Parity

Configuration Term J

Level (cm M) 9 Leading percentages

4/8

( 7F)5d6s2 8G 13

/2 285.500 1.46448 65 24 ( 7F) 8F lS/2 462.080 1.45624 91 4 ( 7F) 8 H ll/

2 509.845 1.51654 35 30 ( 7F) 8F 7

/

2419.480 1.47678 56 25 ( 7F) 8F

9

/2 2840.170 1.54375 47 38 ( 7F) 8D 5

/2 3174.575 1.35525 73 16 ( 7F) 8F

3/2 3705.820 1.02220 86 7 ( 7F) 8F

1 /2 4018.210 -1.19125 92 3 ( 5D1) 6F

4/8

( 7 F)5d6s2

9

/2 1371.045 1.54110 33 8G 29 ( 7F) 8F

4/8

( 7 F)5f/6.s 2 8D 11

/2 2310.090 1.53020 48 43 ( 7F) 8G 7/2 3819.850 1.64184 52 29 ( 7F) 8G S

/2 4695.505 1.83129 56 21 ( 7F) 8F 3

/

5483.980 2.32 51 37 ( 7F) 8F

4/8

( 7 F)5rf6s2 8 F l 3

/

3719.705 1.50473 71 22 ( 7F) 8G n/2 5353.370 1.545 54 21 ( 7F) 8D

®/

5829.860 1.58 56 13 ( 7F) 8P

*/2 6259.090 3.84 91 3 ( 5D1) 6D ?

/2 6488.280 1.635 58 21 ( 7F) 8D 3

/2 6801.190 1.80 55 31 ( 7F) 8D 3

/2 6849.720 2.335 48 42 ( 7F) 8 D

4/8

( 7 F)M6.s2 8 H l 7

/

4646.830 1.40626 95 2 ( 5G1) 6I 1S

/2 5425.060 1.370 64 27 ( 7F) eH is/2 6351.750 1.350 74 10 ( 7F) 6H n/2 6988.820 1.315 74 7 ( 7F) 6 H 9

/2 7441.030 1.240 74 8 ( 7F) 6G 7

/ 2 7839.850 1.05 82 5 ( 7F) 6G 3

/

8130.680 0.705 87 5 ( 7F) 6G 3

/

8336.310 -0.36 89 4 ( 7F) 6G

4/8

( 7 F)5rf6s2 6 F 11/2 6674.155 1.32 71 12 ( 7F) 6G 9

/2 7824.190 1.433 66 12 ( 7F) 6D 7

/

8994.660 1.414 71 12 ( 7F) 6D 5

/

10030.350 1.305 79 6 ( 7F) 6D 3

/

85 4 ( 7F) 6G

*/2 91 3 ( 5D1) 4D
248

Tb I, Even Parity—Continued

Configuration Term J

Level (cm 1 ) 9 Leading percentages

4/8( 7 F)5rf6s2 6G 13/2 7059.900 1.38 75 11 ( 7F) 6 H

“/2 8932.120 1.47 64 11 ( 7 F) 6 F

9

/

2

9986.73 60 17 ( 7 F) 6D

7

/

2

11107.07 53 14 ( 7 F) 6F

5

/

2

73 6 ( 7F) 6 D

3

/2 82 4 ( 7F) 8 H

4/8( 7F)5tf6s2 6 H 1S/2 7767.015 1.342 67 28 ( 7F) 8 H

13/2 9763.020 1.30 73 15 ( 7F) 8H

U/2 10997.850 1.21 75 11 ( 7F) 8 H

9

/

2

11956.255 78 8 ( 7 F) 8 H

7

/

2

12714.050? 70 7 ( 7F) 6D

5

/2 89 3 ( 5D1) 4G

4/8

( 7F)5t/6s2 sp 9

/2 8097.875 1.75 64 17 ( 7F) 8 D

7

/

2

10324.740 1.916 68 16 ( 7F) 6P

5/2 83 6 ( 7F) 6P

4/8( 7 F)5</2

( 3 F) ( 9G)6s 10G 15/2 8190.465 1.54

13/2 8277.040 1.57

17

/2 8506.710 1.53 U/2 8646.210 1.60

9

/

2

9145.230 1.67

7

/ 9867.650 1.68

5

/ 10456.670 1.80

3/2 V2

10920.180 2.145

4/ 8( 7F)5d2

( 3F) ( 9D)6s? i°D?

9

/

2

9897.730 1.81

4/ 8

( 7 F)5d6s2 6D 9

/

2

10680.17 59 16 ( 7F) 6F

4/8

( 7 F)5rf2

( 3F) ( 9 F)6s? 10F? n/2 11260.41 1.68

4/8

( 7 F)5d2

( 3 F) ( 9H)6s? i°H? 19

/2 11331.14 1.46

4/8( 7 F)5c?2( 3 F) ( 9F)6s? 10F? 13

/2 11425.94

4/8( 7 F)5t/2( 3 F) ( 9 F)6s? 10F? 15/2 11580.68

4/8( 7 F)5c?2( 3 F) ( 9H)6s? i°H?

17

/ 2 11879.20 1.43

9

/

2

12228.28

7

/ 12250.99

4/8

( 7F)5t/2( 3 F) ( 9 I)6s ioi 21

/ 2 12283.30

4/8( 7 F)5rf6s2?

6 D? 3/

2

12296.45? 60 17 ( 7F) 6P

4/8( 7F)5t/2 6s? 8G? 11/2 12453.14

4/8( 7 F)5d2 6s? 8G? 13/2 12475.74

4/8

( 7 F)5d2

( 3 F) ( 9 H)6s? i°H? 15/2 12628.67

4/8

( 7 F)5c?6s2?

7/2 12645.32 38 6D 31 ( 7F) 6P

4/8( 7F)5d2 6s? 8G? 9

/

2

12776.31

13/2 12906.60

4/8( 7 F)5tf2 6s? 8G? 15/2 12932.66

11

/ 2 13071.30
249

Tb i, Even Parity—Continued

Configuration Term J

Level (cm 1 ) 9 Leading percentages

1S/2 13116.48

4/8( 7F)5tf2 6s? 8G? 7

/

13277.23

4/8( 7 F)5d2

( 3 F) ( 9 I)6s? 10 I? 19

/

13398.40

U/2 13666.46

7

/

13729.12

9

/

13751.41

4/8 5d

2 6s? 17

/

14016.91

4/8 5d

2 6s? lS/2 14569.67?

4/8 5d

2 6s? 17

/2 14718.11 1.400

4/9( 6His/2)6s6p( 3Po)? ( 15/2,0)? 1S/2 14888.11 1.391

4f

8 5d

2 6s? 8H? 17

/

15189.26 1.409

15/2 15387.79 1.367

15/2 16343.30 1.397

4/9 6s6p? 15/2 16431.13 1.46?

4/9

( 6 H?s/2)6s6p(3P2)? ( 15/2,2)? 17/2 17249.59

4/ 9( 6H!5/ 2 )6s6p( 3Pl)? ( 15/2,2)? 13/2 17875.98

15

/2 19920.41

1S

/2 23031.84 1.24

4/9

( 6 Hi5/2)6s6p( 1 P!) ( 15/2,1)

l 3

/ 2 23043.43 1.391

17

/2 23107.25 1.289

15/2 23147.92 1.339

4/9( 6 H!3/ 2 )6s6p( 3P2)? ( 13/2,2)?

15

/2 23112.35

13

/2 25373.85 1.354

13/2 25553.46 1.328

4/9( 6H!3/2)6s6p( l P!) ( 13/2,1)

ll/2 25637.87 1.334

13

/ 2 25717.68 1.300

15/2 25825.53 1.246

ll/2 26553.26

13

/ 2 26592.90

Tb II ( 6 Hl5/2)6Sl/2 ( 15

/2,

1 /2)8 Limit 47295

225-298 0 - 78 - 17
250

Tb II

(Gd i sequence; 64 electrons) Z=65

Ground state (ls 2 2s 2 2p6 3s 2 3pfi 3d 10 4s 2 4p6 4d'°5s 2 5p6

) 4/ 9( 6 H°5/2 )6s ( 15/2 ,V2 )s

Ionization energy 92900± 600 cm^ 1 11.52± 0.08 eV

Identified odd configurations 4/ 9 6s, 4/ 9 5d, 4/ 8 6s6p?, 4/ 8 5d6p?

Identified even configurations 4/ 8 5d6s, 4/ 8 6s2

, 4/ 8 5d 2 ?, 4/ 9 6p

Meinders carried out the basic analysis of this spectrum using a list of 8550 lines (2850-

7600 A) obtained from observations made at the Argonne National Laboratory and at the

Zeeman Laboratory, Amsterdam [Meinders, 1969, 1970]. Relying more on hyperfine-structure

regularities than on the Zeeman data, she discovered two systems of energy levels based

respectively on the 4/ 8 5d6s and 4/ 9 6s configurations. Verges recorded the infrared spectrum

(0.72-3.3 /xm) at the Laboratoire Aime Cotton, Orsay, and Blaise classified several infrared

transitions connecting the two systems [Blaise, Camus, and Wyart, 1976], The connection has

been confirmed in further work by Meinders and Klinkenberg [1975], who furnished their

unpublished list of levels and g values for this compilation. Some additional data and a few

revisions due to Blaise and Verges (Orsay) and to Meinders and Klinkenberg (Amsterdam)

have been taken from the article by Blaise et al. [1976], Levels given in the original lists to the nearest 0.005 cm' 1 have been truncated to two decimal places.

The wavelength lists for Tb n mentioned above have not been published, but Meinders’

1969 paper gives about 140 lines (2809-5348 A) with energy-level classifications. The g values

are from unpublished Zeeman-effect observations over the range 2850-7700 A [Meinders,

1970]. The accuracies are in general limited by hyperfine broadening.

The lowest few 4/ 9 6s levels occur in J^s-coupling pairs [Meinders, 1970], and we have also

listed the leading LS-coupling eigenvector percentages for these levels. The percentages for

both the 4/ 9 6s and 4/ 9 5d levels are from preliminary calculations by Crosswhite [1977], The

four lowest 4/ 9 5d levels also form a good JJ-coupling term, 4/ 9

( 6 H°5/2 )5d 3/2 , as was noted by

Wyart, Blaise, and Camus [1974]; these authors located the J=9 level of this term, the other

three levels having been given by Meinders. The identified 4/ 9 5d levels are here designated in the LS scheme, which may be as appropriate for a larger part of this configuration. Second

percentages *£

5

% are omitted for these levels. No definite interpretation of the upper odd levels yet exists. A few assignments to the

4/ 8 6s6p and 4/ 8 5d6p configurations are given tentatively [Blaise, Camus, and Wyart, 1976],

Meinders [1970] established that the lowest even levels belong to 4/ 8

( 7 F)5d6s 9 G, 9 D, 7 G,

and 7 F terms, or to mixtures of these, and she also deduced that the 7 F6 level at 5898.35 cm'1 belongs to either 4/ 8 6s 2 or 4/ 8 5d2

. The eigenvectors from a preliminary calculation of

4/ 8(

7 F)5d6s by Crosswhite [1977] give no meaningful term designations for several of these

levels; no ordering by terms has been attempted here. A few additional levels and tentative

assignments to 4/ 8 6s 2 and 4/ 8 5e?

2

, from recent work at Amsterdam and Orsay, have been

included [Blaise et al., 1976], A calculation of the 4/ 8 (5d+6s)2 configurations with their

interactions would no doubt be helpful in extending the analysis of the even levels. Meinders

[1970] has interpreted several of the upper even levels as belonging to J^-coupling terms of

the 4/ 9

(

fi H°)6p subconfiguration.

Sugar and Reader derived the ionization energy.

References

Blaise, J., Camus, P., and Wyart, J. F., in Gmelin Handbuch der Anorganischen Chemie, Vol. 39, Part B4 (SpringerVerlag, Berlin, 1976). EL ND CL ZE Hfs

Crosswhite, H. M., unpublished material (1977). PT

Davis, S. P., Astrophys. J. 132, 486 (1960). ZE Hfs

Dekker, J. W. M„ Bloemhof, H. F„ Brouwer, J. H., and Klinkenberg, P. F. A., Physica (Utrecht) 46, 119 (1970). Hfs
Tb II

Continued 251

King, A. S., Astrophys. J. 72, 221 (1930). W Hfs

Meinders, E., Physica (Utrecht) 42, 427 (1969). EL CL W ZE Hfs

Meinders, E., Thesis, Amsterdam, 75 pp. (1970). EL ND ZE Hfs PT

Meinders, E., and Klinkenberg, P. F. A., unpublished material (1975). EL ND ZE Hfs

Sugar, J., and Reader, J., J. Opt. Soc. Am. 55, 1286 (1965). IP Wyart, J. F., Blaise, J., and Camus, P., Phys. Scr. 9, 322 (1974). EL

[May 1977]

Tb II, Odd Parity

Configuration Term J

Level (cm -1

) 9 Leading percentages

4/ 9

( 6Hl5/2)6Sl/2 ( 15

/ 2, V2)

0 8 0.00 1.37 94 or 94 ( 6H°) 7 H°

7 1016.38 90 or 69 ( 6H°) 5 H°

4/9

( 6 H?3/2)6Sl/2 ( ,3/2,V2)° 7 3010.03 1.286 93 or 71 ( 6H°) 7 H°

6 3542.40 85 or 54 ( 6 H°) 7H°

4/9

(6 H!i/2)6si/2 ( n/2,V2)° 6 5171.76 80 or 52 ( 6H°) 5 H°

5 5234.98 80 or 70 ( 6H°) 7 H°

4/9( 6 Fn/2)6Sl/2 6 6372.95 1.40 92 or 92 (6F°) 7J?° 5 55 or 61 (6 F°) 7 F

°

4/9

(6HI/2)6si/2 ( Sl2,'/2)° 4 80 or 81 ( 6 H°) 7 H°

5 6912.49 1.10 77 or 65 ( 6 H°) 5 H°

4/9

( 6 H°)5f/ 7 H° 8 11261.56 1.368 79 10 ( 6 H°) 7 I° 7 12200.40 1.339 65 15 ( 6H°) 7G°

6 13605722 1.330 54 18 ( 6H°) 7G°

5 15212.59 1.221 66 13 ( 6 H°) 7G°

4 16475.05 1.058 72 8 ( 6 H°) 7G°

3 17475720 0.780 77 10 (6F°) 7 H

° 2 81 12 ( 6F°) 7 H°

4/9

( 6 H°)5o? 7 J

0 9 13518725 1.324 88 8 15289.16 1.290 61 15 ( 6 H°) 5I° 7 17125.82 1.282 48 17 ( 6H°) 7G°

6 17811.61 1.230 62 13 ( 6H°) 7G°

5 73 4 78 3 85

4/9

( 6 H°)5rf 7 F° 6 15023.80 1.442 61 17 ( 6H°) 7 H°

4/9

(6H°)5d 7G° 7 15844-44 1.37 62 24 ( 6H°) 7 I°

4/9

( 6 H°)5t/ 7 F° 5 17061.53 1.445 54 15 (6F°) 7F

°

4/9

( 6 H°)5t/ 5 I° 8 17926.11 1.250 73 15 ( 6H°) 7I°

4/9( 6 H°)5<7 5 H° 7 18790.52 1.25 51 32 (6H°) 5J°

4/8 6s6p? 7 29100.78 1.58 4/8 5d6p? 6 29912.92 4/8 5d6p? 7 30225.87

6 30764-04 4/8 5t/6p? 8 30809.64 4/8 5d6p? 7 31794.62

5 32296.44

6 32646.47

6 33800.91 6 33841.71
252

Tb II, Odd Parity—Continued

Configuration Term J

Level (cm *) 9 Leading percentages

4/8 5(16/)? 7 33873.19

6 33906.62

4/8 5d6p? 7 smo.u

5 31,265.59

4/' 8 5tf6/>? 8 34282.35 1.42

5 34465.42 1.555

4f

s 5d6p? 8 34480.63 1.44

6 34658.50

8 34683.53

6 34788.42

6 35075.68

5,6 35232.47

5 35373.35

6 35451.55

5,6 35468.02

7 35486.83

6 35590.71

7 35798.38

6 36000.42

5,6 36055.04

6 36381.24

7 36685.66

7 3718222

6 3736520

5,6 37423.07

6 37526.84

6 3756523

7 37721.41

7 37754.98

7 37773.92 8 3792624

6 38096.48

6 38260.92

7 38331.30

6 38592.88

5 39035.12

6 39335.01

5,6 39612.10

6 40328.21

7 43282.56

Tb III ( 6Hl5/2) Limit 92900
253

Tb II, Even Parity

Configuration Term

I " J

Level (cm '"*) 9

Leading percentages

4/ 8

( 7F)5cf ( 8G)6s 9G 7 3235.18 64 28 ( 7 F)( 8F) 9F

4/8

( 7 F)5c/ ( 8G)6s 9G 8 3423.28 92 4 ( 7 F)( 8H) 9 H

4/8( 7 F)5o? ( 8G)6s 6 3440.81 1.53 36 9G 34 ( 7 F)(8 F) 9F

4/8

( 7 F)5rf ( 8G)6s 5 4158.72 1.54 33 9G 32 ( 7 F)( 8F) 9F

4/8

( 7 F)5rf ( 8 D)6s 6 5147.23 1.593 48 9D 37 ( 7F)( 8G) 9G

4/8( 7 F)5d ( 8G)6s 5 5761.28 1.59 41 9G 40 ( 7 F)( 8D) 9D

4/8 6s2 7 F 6 5898.35 1.46

4/8

( 7 F)5rf ( 8G)6s? 7G? 7 6223.39 1.43 69 12 ( 7 F)( 8 F) 9F

4/8

( 7 F)5d ( 8G)6s 7G 6 6428.73 1.456 53 27 ( 7 F)(8F) 7F

4f

6CF)5d ( 8G)6s 5 6582.89 1.531 32 7 F 26 ( 7 F)( 8D) 7D

4f

8

( 7 F)5d ( 8 F)6s? 9F? 7 7187.85 56 18 ( 7 F)(8G) 7G

4/8 6s2?

7 F? 5 8278.04 1.464

4/8( 7 F)5d2?

9G? 7 8903.62 1.498

4/8( 7 F)5t/2?

9G? 6 8991.10

4/8( 7 F)5</2?

9G? 8 9273.06

8 11160.18 1.38

4/8( 7 F)5t?6s? 6 11638.64 1.53

4/8( 7 F)5rf6s? 7 11813.17

4/8( 7F)5o? ( 6 H)6s? 7 H? 8 13593.44 1.38 77 17 ( 7 F)( 8 H) 7 F

4/8( 7F)5t?6s? 6 14964.95 1.644

8 19710.26 1.30

8 21035.56

7 21521.06

7 22008.54

7 23653.66 1.38

6 23678.13

8 25138.49 1.34

7 25376.50 1.29

4/9( 6 H!s/2)6pi/2 ( 15/2//2) 7 25804.68 1.37 8 25975.20 1.30

7 26385.71 1.358

6 26731.50 1.40

7 27244.25
254

Tb II, Even Parity—Continued

Configuration Term J

Level (cm -1

) 9 Leading percentages

4/ 9( 6H 15/ 2 )6^3/2 ( 15

/ 2, 3/ 2 ) 8 28014.90 1.29 7 28209.47 1.35 6 28339.32 1.32 9 28488.83 1.326

8 28560.96

4/9( 6 Hl3/2)6pi/2 ( 13

/2,V2) 7 28649.13 1.26

7 29407.02

6 29803.36

5 29995.37

6 30068.29

4/9( 6 H!i/2)6pi/2 (“Ma) 5 30148.67 1.27 6 30639.48 1.20

7 30364.74

7 30476.12 1.34

3 30703.63

7 30895.47 1.30

4/9( 6 Hl3/2)6p3/2 ( 13/ 2, 3/ 2 ) 8 31078.49 1.28

7 31365.86 4/9

( 6 Hl3/2)6p3/2 ( 13

/ 2 , 3

/ 2 ) 6 31566.42 1.32 6 31879.15

5 32023.68 1.27

5,6 32369.10

6 32687.20

6 32853.61 1.31

6 33488.95

5 34318.93 1.14 6 34577.23

7 34804.92

6 34875.62 1.64

7 35007.90 1.15 8 35080.26

7 35196.20

5 35227.65

4 36074.16 8 36602.00

4 37109.47 1.17 8 37193.86

7 37210.37

6,7 38030.16

Tb III ( 6 Hl5/2) Limit 92900
255

Tb III

(Eu i sequence; 63 electrons) Z=65

Ground state (ls 2 2s 2 2pfi 3s 2 3p 6 3d 10 4s 2 4p6 4d 10 5s 2 5pr’) 4/ 9 fi H

o

15/2

Ionization energy 176700± 800 cm 1 21.91± 0.10 eV

Identified odd configurations 4f

9 and 4/ 8 6p

Identified even configurations 4f

8 5d and 4/ 8 6s

Meinders, van Kleef, and Wyart have analyzed the Tb ill spectrum obtained from a pulsed

hollow-cathode source. The spectrum was photographed over the range 2000-6800 A at the

Argonne National Laboratory; most of the approximately 2500 Tb in lines in the unpublished

list are in the range 2000-3220 A. The authors classified 442 lines in this region, including most

of the 100 strongest lines, and an additional 43 lines above 5000 A.

All eigenvector percentages are from Meinders et al. In calculating the 4/ 8

(

7 F)w/

subconfigurations, they used the “real core” 7 F levels in matrices truncated to include only

terms based on the 7 F parent.

Most of the 4/ 8

( 7 F)6p levels have appropriate names in Jx j coupling. A few of the higher

known or predicted levelsof 4/ 8

( 7 F)6p having low eigenvector purities are listed with names in order

to complete the J x j terms or to indicate missing levels. The authors omitted the odd ./=% level

at 55706 cm

-1 in fitting the theoretical parameters to the experimental levels of 4/ 8

( 7 F)6p;

they suggest this level may be perturbed by 4/ 7 5d2

. The terms of 4/ 8

( 7 F)6s and 4/ 8

( 7 F)5d are complete except for five levels of the latter subconfiguration. The calculations of these subconfigurations included configuration interaction

and “all two-particle operators acting only on the electron orbit.” We have interchanged the

4/ 8

(

7 F)5d 8 D:!/2 and 8 F 3/2 designations from those of Meinders et al. to conform with the

assigned eigenvectors.

Sugar and, Reader obtained the ionization energy.

References

Becher, J., Thesis, Johns Hopkins Univ., Baltimore, 135 pp. (1965). PT

Meinders, E., van Kleef, T. A. M., and Wyart, J. F„ Physica (Utrecht) 61, 443 (1972). EL ND PT

Sugar, J., and Reader, J., J. Chem. Phys. 59, 2083 (1973), IP

[January 1977]
256

Tb in

Configuration Term

J

Level (cm ') Leading percentages

4/ 9 6 H° 15

/2 0.00 94 4 4 F3

13/ 2 2804.67 97 2 4 F3

n/2 4734.52 94 1 ep° 9/ 2

6258.08 94 2 4G°4 7 / 2

742221 94 3 4G°4 5 / 2

8285.885 93 4 4G°4 4r 8 F° 1 1 / 2 6470.11 95 2 6H° 9

/2 7621.565 90 6 4 F°3 7 / 2

9144-98 93 4 4 F°3 5

/2 10220.38 93 2 4 F°3 3/2

92 3 4 D°2

V2 92 4 4 D°2

4/8( 7 F)5d 8G 13/2 8972.29 73 23 ( 7F) 8 F

U/2 9218.63 47 30 ( 7 F) 8F

15/2 9275.42 96 9/ 2

10070.38 51 28 ( 7 F) 8 F 7/2 10996.01 70 21 ( 7 F) 8F

5/2 11678.865 83 13 ( 7 F) 8 F 3/ 2

12165.155 92 V2 12454.365 97

4/8( 7 F)5c? 8 D n/2 11217.785 54 38 ( 7F) 8G 9/ 2

11752.295 50 36 ( 7F) 8G 7/ 2

12775.40 55 21 ( 7F) 8G 5

/2 13689.615 52 34 ( 7 F) 8F 3

/2 57 40 ( 7F) 8F

4/8( 7 F)5c? 8 F

13

/2 12986.505 76 21 ( 7F) 8G 3

/2 14515.35 53 41 ( 7F) 8 D

H/2 14771.12 61 26 ( 7F) 8D

V2 97 9

/2 15278.90 61 18 ( 7F) 8 D 7

/2 15820.87 57 30 ( 7 F) 8 D S

/2 16066.485 51 42 ( 7 F) 8 D

4/8( 7 F)5rf 8 H 17

/2 14890.375 100

15/2 15516.735 76 19 ( 7 F) 6 H

15/2 16261.835 83 11 ( 7 F) 6 H

11 1 2

16757.805 85 9

/2 17169.285 89 7/2 17499.43 93 5/2 17755.55 95 3 / 2

98

4/' 8( 7 F)5rf 6 F

n/2 17437.515 80 10 ( 7F)6s 6 F 9

/2 18776.53 80 7/2 20012.85 83 5 / 2

20968.37 87 3/ 21640.59 89 V2 92

4/' 8( 7F)6s 8 F

13

/2 17676.265 99

n/2 19181.10 62 28 ( 7F) 6 F 9

/2 20648.99 88 7/2 21641.865 92 S/2 22384.795 97 3

/2 22898.245 98

*/2 23203.55 99

4/' 8(7F)5c? 6G

13

/2 18158.91 94

11

h 19902.04 76 12 ( 7 F)6s 8F 9

/2 21142.53 86 ?/2 22067.435 89 5

/2 22774.735 81 12 ( 7F) 8P 3/ 2 23234.585 96
Tb III —Continued

Configuration Term J

Level (cm' 1 )

4/8

( 7 F)5c? 8P 9

/

7/2

S

/2

18761.675 21296.02 22980.56

so8983

Leading percentages

15 ( 7F) 8D

12 ( 7 F) 6G

4/8

( 7 F)5d 6H lS/2 13/2

1 1/2

9

/2

7

/2

S

/2

18796.25 20940.41 22216.87

23239.99 24011.27 24592.495

80

85

88

919497

20 ( 7F) 8 H

12 ( 7 F) 8 H

4/8

( 7 F)6s 6p “/2 20317.60

9

/ 2 22475.34

7

/a 23357.625

s

/ 2 24307.445

3

/ 2 24862.595 V2 25241.355

60

57

7454

6187

26 ( 7F) 8F

24 ( 7F)5rf 6D

33 ( 7F)5c? 6D

35 ( 7 F)5c? 6D

4/8

( 7 F)5c? 6 D 9

/2

7

/

S

/2 3

/

1

/ 2

22115.795

22913.07 24189.895

24924.195

6669

58

62

91

26 ( 7F)6s 6F

13 ( 7F)6s 6F

37 ( 7 F)6s 6F

31 ( 7 F)6s 6F

4/8

( 7 F)5c? ep 7/

5

/2

3

/2

24981.97

26632.53

27945.64

85

9598

13 ( 7 F) 6 D

4/8

( 7 F6)6pi/2 (6,V2

)° h/2 13

/

52039.185 52252.635

96

92

4/8

( 7 Fs)6pi/2 (5,V2)°

9

/

n/2 53831.125 5463246

93

95

4/8( 7 F4 )6pi/2 (4//2)° 7/2 9

/2 54965.07555932.24

93

96

4/8

( 7F3)6pi/2 (3,V2)°

5

/2

7

/

55705.84*

56857.39

9397

3

/ 2 56025.375

4/8

( 7 Fe)6/J3/2

4/8

( 7F2)6pi/2

7

/2 56474.84

5

1 2 56694.12

(6, 3

/2)

0 13

/

15/2 n/2 9

/2

56779.125

57036.08 57620.57

58722.65

3

/ 2 57134.15

(2,

1 /2)° 3

/2 5

/57433.545

84

10099

92

92

97

4/8

( 7Fi)6pi/2 (l, 1 /2)° */2

3

/2 57773.445

87

96

4/8

( 7Fo)6pi/2 (O.Vz) 0 */2 57893.975 91

4/8

( 7F5)6p3/2 (5, 3/2)° n/2

13/2

9

/

7

/

58811.23 59189.825

59712.255 60440.75

7392

92

76

23 ( 7F4) (4, 3

/2

)°

20 ( 7F4) (4, 3

/ 2

)°
Tb III—Continued

Configuration Term J

Level (cm 1) Leading percentages

4/' 8

( 7F4 )6/j3/2 (4, 3

/2

)° 9h 60089475 65 32 ( 7F3 ) (3 3

/ 2

)° U/2 60687.115 77 22 ( 7Fs) (5 3

/2

)° 7

/2 61009.61 68 16 ( 7Fs) (5,

3 /2)°

S/2 61485.10 74 20 ( 7F3 ) (3,3/2)°

4/ 8( 7 F3)6p3/2 (3,3/2)° ?

/2 61131.515 55 33 ( 7 F2 ) (2,3

/2

)° 9

/2 61847.625 66 31 ( 7F4 ) (4,

3

/ 2

)° 5

/

2

61973.18 38 34 ( 7 Fi) (l,3

/ 2

)° 3

/2 67 24 ( 7 F2 ) (2

,

3

/ 2

)°

5

/2 61883.195

4/8( 7 F2 )6p3/2 (2

,

3

/ 2

)° 5/2 62157.57 40 33 ( 7 F3) (3 3

/2

)° 3

/

2

33 32 ( 7 Fo) (0

,

3/2)° V2 62 37 ( 7Fi) (1 3

/2

)°

7 /2 62733.445 54 40 ( 7F3) (3 3

/ 2

)°

S/2 62578.475

4/' 8

( 7 Fi)6p3/2 (l,3/2)° V2 57 31 ( 7F2 ) (2

,

3

/2

)° 5

/2 63383.965 45 45 ( 7F2 ) (2,

3

/ 2

)° 3

/2 63721.245 48 40 ( 7 Fo) (0,3

/ 2

)°

Tb IV ( 7 Fe) Limit 176700
(Sm I sequence; 62 electrons) Z=65

Ground state (ls 2 2s 2 2p 6 3s 2 3p6 3d 10 4s 2 4p6 4d 10 5s 2 5pfi ) 4/ s 7 Ffi

Ionization energy 317500± 800 cm" 1 39.37± 0.10 eV

Spector and Sugar have classified 48 lines of Tb iv in the region 1176-2436 A. The terms

are from their analysis; they note that “the rms error in the fit of the wavenumbers of the

lines to the final level values is 0.1 cm' 1 .” The eigenvector percentages of the 4/ 7

( 8 S°)5d and 4/ 7

( 8 S°)6p levels are also from Spector

and Sugar, the calculations having been carried out with matrices including only terms based

on the 4/ 7

( 8 S°) parent term. The six 4/ 7( 8 S°)6p levels comprise two /^'-coupling terms of high

purity. The less appropriate LS-coupling names of these levels are given with corresponding

percentages after the word “or.” The two 4/ 7

( 8 S°)6s levels are designated as

9 S° and 7 S° terms,

but the J ^'-coupling term which constitutes an alternate designation for this pair is also shown.

In their searches for the 4/ 8 5 F levels, Spector and Sugar made use of the approximate

positions of these levels as determined from crystal spectra [Dieke, 1968], Absorption

transitions involving levels of higher terms of 4/ 8 have been observed in both crystal and

solution spectra [Dieke, 1968; Carnall, Fields, and Rajnak, 1968]. The lowest 4/ 8 level above the

7 F term is a

5 D 4 level around 20000 cm' 1

. We took the leading percentages for the levels of

the 7 F term from Ofelt’s calculation.

Spector and Sugar obtained the quoted ionization energy by adjusting an earlier result of

Sugar and Reader [1973] to the experimental value of 4/ 7 ( 8 S°)6s relative to the ground level.

References

Carnall, W. T., Fields, P. R., and Rajnak, K, J. Chem. Phys. 49, 4447 (1968). [EL] [CL] [W] PT

Dieke, G. H., Spectra and Energy Levels of Rare Earth Ions in Crystals, Ed. H. M. Crosswhite and H. Crosswhite, pp. 253-268 (Interscience Publishers, New York, 1968). [EL] ND

Ofelt, G. S„ J. Chem. Phys. 38, 2171 (1963). ND ZE PT

Spector, N., and Sugar, J., J. Opt. Soc. Am. 66, 436 (1976). EL CL IP PT

Sugar, J., and Reader, J., J. Chem. Phys. 59, 2083 (1973). IP

[October 1976]

Tb IV

Configuration Term J

Level (cm -1

) Leading percentages

00 >

7 F 6 0.0 96 2

5G1

5 2051.6 97 1 5G1

4 3314.2 95 1 5 D1

3 4292.3 95 2

5 D1

2 4977.9 95 3

5D1

1 5431.8 95 3

5Dl

0 5653.8 95 3

5 D1

4/7( 8S°)5d 9D° 2 511*01*.0 99 3 51800.8 98 4 52399.6 97 5 53316.6 97 6 51*882.5 100

4/7( 8 S°)5d 7 D° 5 62680.6 97 4 63281.1* 97 3 6371*612 98 2 61*081.1* 99

1 61*31212 100
Tb IV—Continued

Configuration Term J

Level (cm ‘ *) Leading percentages

4/7( 8 S°)6s 9g° 4 8A95L5 or ( 8S?/2 ) ( 7

/2, 1 /2)°

4/7

( 8 S°)6s 7 S° 3 87573.

U

or ( 8S?/2) ( 7 /2,V2)°

4/7( 8 S7/2)6pi/2 ( 7 /2//2) 3 127839.3 98 or 86 ( 8 S°) 9P

4 128636.4 97 or 60

4/7

( 8 S7/2)6p3/2 ( 7/2,3

/ 2 ) 5 134285.2 100 or 100 ( 8S°) 9P

4 135692.7 97 or 60 ( 8S°) 7 P

3 136396.2 98 or 86 ( 8 S°) 7 P

2 136869.2 100 or 100 ( 8 S°) 7 P

Tb v ( 8 S?/2 ) Limit 31 7500
DYSPROSIUM

Dy i

66 electrons Z=66

Ground state (ls 2 2s 2 2p6 3s 2 3p6 3d 10 4s 2 4p6 4d 10 5s 2 5p6

) 4/ 10 6s 2 5 I 8

Ionization energy 47900± 5 cm 1

Identified even configurations

Identified odd configurations

5.9389± 0.0006 eV

4/ 10 6s 2

, 4/ 9 6s 2 6p, 4/ 9 5d6s6p, 4/ 10 5d6s, 4/ 10 6s7s, 4/ 10 6s6d

4/ 9 5d6s 2

, 4/ 9 5d2 6s, 4/ 10 6s6p, 4/ 10 5d6p?, 4/'°6s7p, 4/ 9 5d6s7s

Main References for Wavelengths and Energy Levels

The most complete description of the Dy I and Dy ii spectra is given in the 1970 UCRL

report by Conway and Worden. More than 22000 lines are listed between 2300 and 11400 A,

and Zeeman data are included for the range 2300 to 9000 A. Sharp-line spectra were obtained

by the use of electrodeless lamps containing only the isotope 162 Dy. About 85% of the lines are assigned to either Dy I or Dy n, with almost 10000 lines being listed for Dy I. King’s earlier

temperature classifications of 4584 Dy lines were used in confirming and extending the

separation of the two spectra [King, Conway, Worden, and Moore, 1970],

Conway and Worden [1970, 1971] found more than 300 levels in the first analysis of Dy I, and classified almost 2000 of the Dy I lines. The levels of the 4/‘°6s2 5 I ground term were

identified and a number of the lowest odd levels were assigned to terms of 4/ 9 5d6s 2

. Camus and Masmoudi observed 1418 Dy I lines in absorption between 2478 and 4100 A,

and found 81 new high levels [Masmoudi, 1972; Camus and Masmoudi, 1973], Since the

published values of the low levels are given to only two decimal places, we have for

consistency rounded off the upper levels to two places.

Spector identified six upper even levels as belonging to the two J^-coupling terms of

4/ 9

( 6 H°5/2 )6s 2 6p, and Griffin, Ross, and Cowan extended the interpretation of the odd levels to include 62 assignments to eigenvectors of 4/ 10 6s6p and 4/ 9 5d6s 2

. In his 1973 thesis, Wyart gives a large extension of the Dy I analysis and some revisions.

He lists a total of almost 400 even levels and more than 300 odd levels. Wyart notes that a list of 9500 lines of Dy I and Dy n having energy-level classifications or Zeeman data will be given

in a separate report. High-resolution infrared spectra (0.8 to 2.6 p,m) obtained by Verges with

a Fourier spectrometer were among the new data available to Wyart.

The levels and eigenvector percentages given here are primarily a rearrangement of the

data in Wyart’s thesis [1973], including some additions and revisions made later [Wyart, 1975;

1976], A few uninterpreted levels without g values and listed by only one investigator were marked as tentative.

g Values

The J and g values of the ground level of Dy i were determined by atomic-beam

magnetic-resonance techniques in 1961 [Cabezas, Lindgren, and Marrus; Smith and Spalding];

these measurements gave the first direct experimental evidence that the ground level was

4/ 10 6s 2 5 I g

. The five-place g values listed here are from more recent work by Childs [1970] and

by Ferch, Dankwort, and Gebauer [1974], The latter authors found the g value of the ground

level to be 1.2415869±.0000010, and Childs gives uncertainties of ±0.00003 and ±0.00005 for his determinations of the g values of the T 7 and 5 I 6 levels, respectively.
262 Dy I —Continued

The remaining g values are from Conway and Worden or from Wyart [1973, 1976]. Some

values given by Wyart to the nearest 0.005 have been truncated to two places to distinguish

them from the three-place values. The three-place values from Conway and Worden are accurate to about ±0.003 and most of the two-place values are accurate to ±0.01 or 0.02.

Calculations, Theoretical Interpretation

All of Wyart’s calculations of Dy I configurations except 4/ 10 6s2 and 4/ 10 6s7s were

performed with truncated matrices. Calculation of the subconfigurations (4/

10

( 5 I)5c?6s+

4/ 9( 6 H°, ,i F°)6s 2 6p) allowed him to interpret 42 of the even levels. The 4/ 10

( 5 I)5d6s percentages

are for basis states with “real core” wavefunctions (4/ 10 electrons in intermediate coupling);

the corresponding percentages for pure-coupling basis states would in general be lower. In addition to the effect of truncation, Wyart noted that the omission of additional configurations,

particularly 4/ 9 5d6s6p, from this calculation must significantly affect some of the eigenvectors.

He showed that 4/ 9 5d6s6p probably begins with the level at 23031.46 cm 1 (J=8). The

configuration assignments of most even levels above this point that have not been assigned to calculated eigenvectors are given as tentative.

The eigenvector percentages for the odd levels are from Wyart’s calculation [1973, 1974]

of the subconfigurations (4/

9

(

<i H

o

, 6 F

o )5d6s 2 +4/ 9

(

(! Ho

, 6 F

o )5d 2 6s+4/ 10

( 5 I)6s6p). Wyart [1973]

made a separate calculation of 4/ 10

( 5 I)6s6p in JX J2 coupling, but did not transform to this scheme in his calculation including all three subconfigurations. The levels belonging mainly to 4/'°( 5 I)6s6p are thus listed here in J X J2 coupling without percentages, and the leading

percentages in LS coupling are given after the word “or.” Murakawa and others had noted the

appropriateness of J,J2 coupling for this subconfiguration, and the resultant strong effects on

the intensities of the 4/'°( 5 I)6s 2 —4/

10

( 5 I)6s6p transitions have been mentioned by several

authors. (Similar effects occur for 4/ A'6s

2 —4/‘v 6s6p transitions in general.) Cowan [1973] has

calculated transition probabilities for some of these lines. Wyart remarks that the three calculated odd subconfigurations are expected to account

for the levels up to about 28000 cm' 1

. Interpretation of the odd levels above this point would

thus require the inclusion of higher terms in the 4f

N cores of these configurations, and also additional configurations. Wyart [1975] has tentatively assigned a number of levels above

34000 cm'1 to the 4/ 10 5d6p configuration because they combine mainly with 4/ 10 5d6s levels. The assignments of several levels near 36000 cm'1 to 4/ 10 6s7p and the location of two

4/ 9 5e?6s7s levels above 40000 cm"1 are also due to Wyart [1975, 1976].

Hyperfine Structure, Isotope Shifts, Ionization Potential

Hyperfine structure and isotope shifts in Dy I have been investigated extensively; only a few of the more recent references are included below. Griffin et al. and Wyart used the

isotope shifts of particular levels as a help in making configuration assignments.

Worden, Conway, Paisner, and Solarz [1977] have observed high members of two series in Dy I by using laser techniques. These data became available too late for inclusion here, but the

quoted ionization energy is a new determination from these series.

References

Cabezas, A. Y., Lindgren, I., and Marrus, R., Phys. Rev. 122, 1796 (1961). ZE Hfs Camus, P., and Masmoudi, K., Spectrochim. Acta, Part B 28, 79 (1973). EL CL W ZE

Childs, W. J„ Phys. Rev. A 2, 1692 (1970). ZE Hfs Conway, J. G., and Worden, E. F., Univ. Calif. Radiation Lab., Berkeley, UCRL-19944, 613 pp. (1970). (Available from

National Technical Information Service, Springfield, Va. 22161.) EL CL W ZE PT

Conway, J. G., and Worden, E. F., J. Opt. Soc. Am. 61, 704 (1971). EL CL W ZE PT

Cowan, R. D., Nucl. Instrum. Methods 110, 173 (1973). AT

Dekker, J. W. M., Klinkenberg, P. F. A., and Langkemper, J. F., Physica (Utrecht) 39, 393 (1968). IS Ebenhoh, W., Ehlers, V. J., and Ferch, J., Z. Phys. 200, 84 (1967). Hfs

Ferch, J., Dankwort, W., and Gebauer, H., Phys. Lett. A 49, 287 (1974). ZE Hfs

Golovin, A. F., and Striganov, A. R., Sov. Phys.-Usp. (Engl. Transl.) 10, 658 (1968). IS

Griffin, D. C., Ross, J. S., and Cowan, R. D., J. Opt. Soc. Am. 62, 571 (1972). ND IS PT

King, A. S., Astrophys. J. 72, 221 (1930). W
Dy I —Continued 263

King, A. S., Conway, J. G., Worden, E. F., and Moore, C. E., J. Res. Nat. Bur. Stand. (U.S.) 74A, 355 (1970). W

Masmoudi, K., Thesis (Third Cycle), Univ. Paris-Sud, Orsay, 130 pp. (1972). EL CL W ZE

Miller, G. E., and Ross, J. S., J. Opt. Soc. Am. 66, 585 (1976). IS Murakawa, K., Phys. Rev. A 7, 416 (1973). Hfs

Rosen, A., and Nyqvist, H., Phys. Scr. 6, 24 (1972). Hfs

Ross, J. S., J. Opt. Soc. Am. 62, 548 (1972). IS

Smith, K. F., and Spalding, I. J., Proc. R. Soc. London, Ser. A 265, 133 (1961). ZE

Spector, N., J. Opt. Soc. Am. 61, 1350 (1971). ND PT

Worden, E. F., Conway, J. G., Paisner, J. A., and Solarz, R. W., unpublished material (1977). IP Wyart, J. F., C. R. Acad. Sci., Ser. B 273, 763 (1971). EL ND

Wyart, J. F., Thesis, Univ. Paris-Sud, Orsay, 194 pp. (1973). EL ND CL ZE IS IP PT

Wyart, J. F., Physica (Utrecht) 75, 371 (1974). EL ND ZE PT

Wyart, J. F., unpublished material (1975, 1976). EL ND ZE PT

[July 1976]

Dy I, Even Parity

Configuration Term J

Level (cm -1

) 9 Leading

percentages

4/ 10 6s2 5

I 8 0.00 1.24159 94 7 4134.23 1.17346 97 6 7050.61 1.07155 96 5 9211.58 0.911 93 4 10925.25 0.618 91

4/ 10

( 5 Is)5d6s(3 D) 3 [8] 9 17514.50 1.316 90 8 18903.21 1.22 39

7 21074.20* 1.24 38 " 3 [7] 8 17613.36 1.33 61 7 18937.78 1.28 47 6 21159.79 1.24 58 " 3 [6] 7 18094.52 1.38 84 6 69 5 67 " 3 [9] 10 18462.65 1.282 90 9 19240.82 1.217 69 8 20193.60 1.16 63

4/ 10 6s2 3 K2 8 19019.15 1.14 57

4/ l0( 5

I 8)5d6s(3 D) 3 [10] 11 19348.72 1.27 100 10 19797.96 1.21 86 9 20209.00 1.14 77

4/9

( 6 Hl5/2)6s2 6pi/2 ( 15/2,V2) 7 20614.32* 1.32 55 8 20789.85 1.32 54

4/10

( 5 I 7 )5d6s(3 D) 3 [7] 8 21603.04 1.26 47 " 3[6] 7 21778.43 1.26 49

4/10

( 5 Ia)5d6s( 1 D) H9] 9 22045.79 1.22 49 " HlO] 10 22487.14 1.197 68

4/9( 6 H°)5d ( 7 H8 )6s6p(3 Po) (8,0)? 8 23031.46 1.37

4/9 5d6s6p? 9 23218.59 1.37

4/ l0( 5 l7)5d6s(3 D) 8 23280.46 1.176 37 3[9]

4/ 10( 5 l7)5d6s(3 D)? 6 23333.92 1.16 19 3[7]

4/ 10

( 5

I 7 )5d6s(3 D) 7 23360.66 1.222 26 3[7]

4/10 5d6s? 8 23388.95 1.22
Dy I, Even Parity—Continued

Configuration Term J

Level (cm -1

) 9 Leading

percentages

4/9( 6 H!s/2)6s2 6p3/2 ( 15

/2,3/ 2 ) 8 23534.50 1.31 56 7 23591.27 1.26 30 9 23780.26 1.34 84 6 34.

4/10

( 5 l7)5d6s(3 D) 3 [8] 7 23655.36 1.174 55

4/9( 6 H?3/2)6s2 6pi/2? 6 23683.87 1.30 28 ( l3 /2,‘/2)

4/9 5d6s6p? 7 23799.41 1.38

4/ 10( 5

I 7 )5d6s(3 D) 9 23841.90 1.16 44 3[9]

4/ 10 5d6s? 7 23972.34 1.24

4/ 10 6s2 6 24062.88 1.217 44 3 H4

4/ 10( 5

I 7 )5d6s(3 D) 6 24302.02 1.20 35 3[6] " 7 24430.27 1.26 30 3[7]

4/9( 6 H?3/2 )6s2 6pi/2 6 24867.17 1.33 27 ( 13/2,V2)

4/9 6s2 6p? 6 24899.06 1.35

4P 5d6s6p? 10 24978.98 1.38 4/9 5d6s6p? 8 25095.66 1.408

4/ 10( 5

IG )5d6s( 3 D) 7 25502.82 1.16 34 3[6] "

6 25506.38 19 3[6] "

5 25744.35 1.08 37 3[6] 4/9 5d6s6p? 7 25879.15 1.35

5 25993.57 1.18

7 26200.05? 4/9 5d6s6p? 9 26244.60 1.37

5 26284.69 1.20 4/9 5d6s6p? 8 26349.49 1.34

4/9 5d6s6p? 6 26387.81 1.48

4/9 5d6s6p? 7 26425.15 1.24

4/ 10( 5 Ie)5d6s(3 D) 3 [7] 8 41 7 26435.71 1.14 46 6 70

5 26506.51 1.32

6 26533.88 1.14

4/9 5d6s6p? 10 26752.29 1.36

4/ 10

( 5 Ie)5d6s(3 D) 3 t8] 7 85 8 26759.81 64 9 49

4/9

( 6 Hl3/2)6s2 6p3/2 ( 13

/2,3 /2) 6 26785.45 1.28 51 7 26848.46 1.28 69 8 27059.89 1.29 89 5

9 26955.00 1.37

4/9( 6 H?3/2)6s2 6p3/2 6 27068.94 1.22 29 ( 13

/2,3/ 2)

9 27390.97 1.35

8 27445.90 1.34

7 27462.41 1.413

6 27474.64 1.35
265

Dy i, Even Parity—Continued

Configuration Term J

Level (cm -1

) 9 Leading

percentages

4/ 10( 5 Is)5d6s(3 D) 4 27578.02 0.98 42 3[5] 4/9 6s2 6p? 5 27680.12 1.317 8 27896.80 1.33

7 27959.98 1.36 6 27987.90 1.32 4 28082.47 1.12 9 28158.51 1.33 4 28235.74 1.12 5 28265.78 1.32

4P 6s2 6p? 5 28309.18 1.20 6 28326.48 1.33

7 28358.70 1.35 4/9

( 6 Fll/2)6s2 6p3/2 (“/2,3

/2) 5 28379.82 1.40 50 10 28433.41 1.33 8 28539.57 1.32

5 28666.31 1.30 4/9

( 6 Fii/2)6s2 6pi/2 ( 11 h,1 h) 6 28849.06 1.36 69

6 28909.39 1.38

8 28971.42 1.35 5 28987.02 1.317 6 29159.93 1.20

7 29169.98 1.313 8 29291.32 1.36

9 29465.04 1.32

5 29496.33 1.18

7 29512.27 1.36 4/9 6s2 6p? 7 29532.42 1.24

3 29626.20 0.82

6 29682.16 1.36

10 29706.72 1.32

9 29714.72 1.31

11 29742.49 1.34

8 29841.69 1.32

7 29877.37 1.38

6 30015.44 1.287

5 30033.06 1.34

6 30102.59 1.29

10 30106.65 1.28

7 30163.33 1.36

7 30444.88 1.30

9 30459.64 1.26

6 30475.95 1.34 5 30512.73 1.29

225-298 0 - 87 - 18
Dy I, Even Parity—Continued

Configuration Term J

Level (cm -1

) 9 Leading

percentages

4/ l0

( 5

I 8)6s7s(3 Si) (8,1) 9 30560.56 1.32 99 8 30979.53 1.26 92 7 31509.12 1.18 99

8 30600.15 1.31

7 30621.87 1.27

4 30662.79 1.25

9 30716.06 1.26

8 30739.79 1.32

4 30896.57 1.48

6 30988.25 1.332 8 31061.18 1.306

5 31079.52 1.223

7 31124.80 1.34 6 31180.01 1.26

8 31233.57 1.34

9 31287.04 1.35

7 31362.62 1.26

7 31423.04 1.32

8 31469.00 1.42

10 31489.64 1.276

6 31529.68 1.42

5 31545.99 1.38

7 31674.08 1.31

5 31742.14 1.393

9 31775.65 1.27

8 31820.28 1.204

10 31838.24 1.307

7 32036.51 1.32

9 32206.27 1.24

7 32382.29 1.37

6 32392.59 1.32

7 32411.25 1.32

10 32428.08 1.35

8 32428.66 1.32

7 32470.81 1.32 8 32554.86 1.27

8 32675.52 1.27

3 32712.54 1.26

7 32722.87 1.33

9 32763.21 1.29

8 32940.47 1.35

6 32945.30 1.33

9 33086.26 1.29

7 33110.16 1.28
Dy I, Even Parity—Continued

Configuration Term J

Level (cm -1

) 9 Leading

percentages

6 33210.13 1.32 8 33246.13 1.24 9 33252.28 1.31 4 33358.79 1.07 5 33381.16 1.382 8 33406.06 1.31 6 33474.30 1.37

7 33475.72 1.33 7 33552.39 1.28 6 33656.96 1.28 7 33746.82 1.27 8 33753.11 1.31 7 33806.12 1.204 6 33911.02 1.30 7 34027.70 1.26 7 34060.16 1.13 7 34131.12 1.29 9 34174.66 1.31 6 34179.68 1.190 7 34196.55 1.32

6 34296.69 1.36 7 34324.66 1.35 6 34547.46 1.31 5 34573.07 1.30 8 34676.95 1.24 6 34679.75 1.488 9 34689.19 1.28 5 34742.71 1.24 7 34742.84 1.34 10 34776.04 1.278 9 34829.30 1.27 5 34841.48 1.36 7 34843.11 1.29

f

10

( 5 l7)6s7s( 3Si) (7,1) 8 34922.08 1.27 97

7 35135.33 1.20 96 6 35421.17 1.10 97

7 35003.75 1.31 8 35053.56 1.32 3 35141.43 0.98 5 35184.56 1.30 9 35219.85 1.28 7 35221.98 1.32 8 35249.13 1.32 5 35354.27 1.38
Dy I, Even Parity—Continued

Configuration Term J

Level

(cnrr *) g Leading

percentages

8 35377.51 1.28

10 35385.78 1.27

5 35523.35 1.16

5 35578.47 1.21

7 35695.77 1.34

7 35737.77 1.20

6 35744.63 1.32

9 35762.55 1.32

7 35866.60 1.24 8 35938.74 1.35

9 35940.35 1.32 6 35970.10 1.40 6 36093.54 1.27

7 36119.46 1.25

8 36308.08 1.27

6 36365.09

8 36392.11 1.33

7 36417.25 1.29

9 36487.20 1.31

10 36490.07 1.25

7 36491.05

7 36508.79 1.34

8 36553.84 1.38 8 36599.44 1.29

7 36608.28 1.18

6 36612.84 1.262

4/ 10

( 5 l7)6s7s( 1 So) (7,0) 7 36667.78 91

9 36708.15 1.32

9 36717.57 1.29

4/ 10 6s6d? 8 36760.64 1.24

8 36807.39 1.34

9 36822.27 1.25

7 36865.40 1.31

4/ 10 6s6d? 10 36905.44 1.25

7 36924.54 1.22

8 36954.35 1.30

4/ 10 6s6d? 9 36964.32 1.21

4/ 10 6s6d? 10 37007.58 1.22

7 37015.22 1.27

4/ 10( 5 Is)6s6d(3 D)? 11 37039.00 1.28

6 37058.60 1.31

8 37087.47 1.33

9 37121.97 1.27
Dy I, Even Parity—Continued

Configuration Term J

Level (cm' 1

) 9 Leading

percentages

6 37125.45 1.33

7 37135.33 1.20

6 37163.16 1.29

5 37182.19 1.26

7 37212.06 1.30

5 37231.26 1.26

7 37295.97 1.28

11 37299.36 1.26

6 37324.62 1.24

4/ 10 6s6d? 8 37339.89 1.25

7 37366.09 1.32

8 37398.46 1.25

5 37472.68 1.34

7 37501.58 1.243

8 37527.15 1.24

7 37551.19 1.30

5 37559.17 1.27

4/ 10 6s6d? 9 37591.83 1.212

7 37607.89 1.29

5 37646.62 1.20

6 37650.98 1.4

8 37676.89 1.32

7 37694.25 1.26

4/ 10 6s6d? 10 37706.12 1.203

9 37751.03 1.29

7 37751.34 4/ 10 6s6d? 8 37820.22 1.14

8 37841.84 1.29

6 37856.42 1.247

9 37933.63 1.377

7 37980.03 1.191

8 37992.78 1.187

7 38054.61 1.333

4/ 10( 5

I6 )6s7s( 3 Si ) (6,1) 6 38070.03 1.11 95 5 38093.85 1.08 96 7 38123.30 1.20 91

8 38078.12 1.19

5 38101.89 1.20 8 38150.52 1.38

6 38164.83 1.257 6 38214.81 1.22

8 38254.97 1.29

7 38264.28 1.34

9 38285.36 1.25
Dy I, Even Parity—Continued

Configuration Term J

Level (cm -1

) g Leading

percentages

10 38329.91 1.30 5 38334.20

8 38356.27 1.36 7 38366.31 1.333 4 38431.81 1.26 9 38444.35 1.28 7 38452.46 1.238 7 38515.31 1.298 8 38516.86 1.222 7 38524.52 1.34 8 38551.45 1.25 5 38673.50 1.30 9 38674.91 1.28 6 38715.04 1.26 7 38737.66 1.29 6 38852.60 1.19 7 38861.55 8 38870.01 1.25 5 38890.92

7 38954.01 1.31 5 38964.68 1.28 8 38973.45 1.24 9 39035.85 1.24 5 39048.18 1.38

7 39078.14 1.28 4 39084.97 1.33

8 39096.06

7 39097.74 1.21 9 39120.61 1.34 10 39176.58 1.26 5 39201.13 1.10 9 39332.82 1.28

7 39332.97 1.29 8 39376.93 1.33 4 39378.71 0.98

5 39411.02 1.272 4 39420.80 1.20 4 39430.94 1.14 9 39513.68 1.30

7 39516.88 1.288

r

io

( 5

I6)6s7s( 1 So) (6,0) 6 39545.90 84

10 39573.04 1.28

11 39627.83 1.27
Dy I, Even Parity—Continued

Configuration Term J

Level (cm’ 1 ) 9 Leading

percentages

7 39681.94 1.32

9 39692.49 1.25 5 39748.26 1.25

10 39750.08 1.29

7 39777.62 1.253

5 39780.02 1.29

6 39786.30 1.25

6 39849.81 1.33

4 39853.98 1.39

9 39895.76 1.24 8 39909.55 1.28

10 40005.82 1.23

4/ 10

( 5

I 5 )6s7s(3 Si) (5,1) 4 40023.04 0.82 96 5 40213.21 0.968 92 6 40520.48 1.18 83

7 40245.78 1.28

3 40295.08 1.28

7 40396.05 1.31 6 40410.19 1.31

8 40472.96 1.25 6 40491.53

3 40621.22 1.03

4 40625.90 1.26 8 40639.33 1.268

9 40683.59 1.29

3 40782.04 1.30

5 40796.42 1.30 8 40833.31 1.26

4 40835.60 1.34 8 40871.39 1.24

4 40924.80 1.24

5 40931.58 1.30 4 40973.37 1.14 3 40983.60 1.20 9 41029.59 1.222 8 41037.23

7 41053.08

8 41098.71 1.25 9 41135.13 1.316 8 41203.90 1.26 9 41210.30 1.25 9 41235.96 1.222

7 41371.37 1.23 8 41383.00
272

Dy I, Even Parity—Continued

Configuration Term J

Level (cm _1

) 9 Leading

percentages

4 41458.22 1.22

4/ 10( 5

I 4 )6s7s(3 Si) (4,1) 3 41492.41 0.44 99 4 41859.44 0.80 92 5 42490.50 1.00 81

7 41503.84 1.27 8 41638.55

4 41957.18 1.22

4 42146.02 1.22

3 42220.12 1.26 4 42236.05 1.22 10 42668.10 1.35

4 42892.94 1.12 8 42921.39

4 42940.96 1.23 7 42984.71 1.21 5 43020.84 1.30

7 43222.10 8 43728.57

8 44487.65

6 45703.64

7 46391.45 8 47354.04

Dy II ( 5 l8)6SX/2 (8,

1 /2)l7/2 Limit 47900

Dy I, Odd Parity

Configuration Term J

Level (cm -1

) 9 Leading percentages

4/9

( 6 H°)5d6s2 7 H° 8 7565.60 1.35246 81 7 851920 1.336 60 6 10088.80 1.36 33 5 12298.56 1.24 56 4 13952.00 1.082 66 3 15254-94 0.77 75 2 82

4/9( 6 H°)5<26s2 7 J° 9 9990.95 1.32 89 8 12007.10 1.28 50 7 1 4367.80 1.27 50 6 14970.70 1.24 39 5 16684.73 1.082 67 4 79 3 76

4/9

( 6 H°)5d6s2 7p° 6 11673.49 1.392 47

4/9( 6 H°)5d6s2 7 G° 7 12655.13 1.36 64
273

Dy I, Odd Parity—Continued

Configuration Term J

Level (cm -1

) g Leading percentages

4/9( 6 H°)5d6s2 7 K° 10 12892.76 1.29 99 8 16288.73 1.19 46 9 16717.79 1.24 64 7 17687.90 1.16 44 6 19182.66 1.036 72 5 81 4 89

4/9( 6 H°)5d6s2 5 K° 9 13495.92 1.23 65 8 19688.59 1.22 57

7 21 783.42 1.15 70 6 23^64-02 0.96 52 5 24881.85 0.72 67

4/9

( 6 H°)5d6s2 7p° 5 14153.49 1.42 51

4/9( 6 H°)5d6s2 51° 8 14625.64 1.25 67 7 18339.80*

1.21 26 6 20554.73 1.11 45 5 22294.88 1.02 39 4 23686.81 0.767 70

4/9( 6 H°)5d6s2 5H“ 7 15194.83 1.26 78

4/ 10

( 5

I s)6s6p(3Po) (8,0)° 8 15567.38 1.31 or 58 ( 5

I)( 3 P°) 7 H°

4/9( 6 H°)5d6s2 6 15862.64 1.257 43 5G°

4/ 10( 5

I 8)6s6p(3P?) (8,1)° 9 15972.35 1.29 or 64 ( 5

I)( 3 P°) 7 I° 7 16693.87 1.22 or 29 ( 5

I)( 3 P°) 5 H°

8 1673320 1.20 or 32 ( 5

I)( 3 P°) 3 K°

4/9

( 6 F°)5d6s2 7 P° 4 16069.98 1.62 47

4/9

( 6 F°)5d6s2 4 16412.80 1.51 35 7P°

4/9( 6 H°)5d6s2 6 16591.38 1.348 42 7G°

4/9

( 6 F°)5d6s2 5 1 7502.89 1.45 24 7 D°

4/10

( 5

I 8)6s6p(3PS) (8,2)° 10 1 7513.33 1.30 or 99 ( 5 I)( 3P°) 7 K°

9 17727.15 1.25 or 51 ( 5

I)( 3P°) 5 K°

8 18021.89 1.23 or 39 ( 5

I)( 3 P°) 5 I° 7 18433.76* 1.20 or 35 ( 5 I)( 3P°) 3 I° 6 18711.93 1.172 or 33 ( 5 I)(3 P°) 3 H°

4/9

( 6 H°)5d6s2 sp° 5 1780424 1.322 54 4/9

( 6 H°)5d6s2 6 18172.87 1.34 39 5 H°

4/9( e H°)5d2( 3 F) ( 8G°)6s 9G° 8 18472.71 1.46 48

4/9( 6 H°)5d2( 3 F) ( 8G°)6s 7 18528.55 1.467 25 9G°

4/9( 6 F°)5d6s2 6 1856120 1.27 18 7G°

4/9( 6 F°)5d6s2 7 18857.04 1.335 22 7 H°

4/9( 6 F°)5d6s2 7 H° 8 19092.30 1.33 91 4/9

( 6 H°)5d2

( 3 F) ( 8 F°)6s 6 1930426 1.54 36 3F°

4/9( 6 F°)5d6s2 5 19480.87 1.35 29 7G°

4/9

( 6 H°)5d2( 3 F) ( 8 I°)6s 9 19557.83 1.39 36 9

I° 4/9

( 6 H°)5d2

( 3 F) ( 8 K°)6s 10 19797.96 1.367 40 9 K°

4/9

( 6 H°)5d6s2 5 19813.98 1.270 33 5 H°

4/9

(6 F°)5d6s2 6 19856.88 1.35 40 7 H°
274

Dy I, Odd Parity—Continued

Configuration Term J

Level (cm >) g Leading percentages

4/ 10

( 5 l7)6s6p( 3P8) (7,0)° 7 19907.51 1.23 or 26 ( 5 I)(3 P°) 7 I°

4/10

( 5 l7)6s6p( 3P?) (7,1)° 8 20341.32 1.23 or 30 ( 5

I)(3 P°) 7 K°

7 20766729 1.16 or 30 ( 5 I)(3 P°) 5 K°

6 20817.61 1.13 or 21 ( 5 I)( 3 P°) 7 I°

4/9( 6 H°)5d6s2 4 20430.11 1.28 33 7 F°

4/9( 6 H°)5d2

( 3 F) ( 8 K°)6s 9 K° 11 20448.44 1.354 87 4/9

( 6 H°)5d6s2 4 20474-99 1.30 31 5G°

4/9( 6 F°)5d6s2 7 G° 7 20485.40 1.375 63 4/9

( 6 H°)5d2

( 3 F) ( 8 I°)6s 8 20884-87 1.36 29 9

I° 4/9

( 6 H°)5d2

( 3 F) ( 8G°)6s 5 20891.64 1.32 31 9G°

4/9

( 6 H°)5d6s2 5 20921.55 1.30 35 5H°

4/9

( 6 H°)5d2( 3 F) ( 8 F°)6s 7 20954.18 1.41 30 9F°

4/9( 6 H°)5d2

( 3 F) ( 8 D°)6s 6 21392.40 1.46 29 9D°

4/9

( 6 H°)5d2

( 3 F) ( 8 H°)6s 9 21540.68 1.34 39 9 H°

4/9( 6 F°)5d6s2 5 H° 7 2167528 1.22 62 6 24040.59 1.26 44 4 26440.41 1.046 53 3 27601.33 0.84 68

4/9( 6 H°)5d2( 3 F) ( 8 K°)6s 10 21 788.93 1.34 33 9 K°

4/ 10( 5

I 7 )6s6p(3 P8) (7,2)° 9 21838.55 1.25 or 62 ( 5

I)( 3P°) 7 K°

8 2189922 1.20 or 33 ( 5

I)( 3 P°) 7 I° 7 2206129 1.18 or 28 ( 5 I)(3 P°) 7 I° 6 22286.87 1.15 or 38 ( 5 I)(3 P°) 7 H°

5 2252421 1.04

4/9

( 6 H°)5d6s2 4 22099.06 1.059 41 5 H°

4/9( 6 H°)5d2

( 3 F) ( 8 L°)6s 9 L° 12 22541.18 1.333 99

11 23677.38 1.288 78 10 24858.74 1.26 49 9 25955.10 1.27 34 8 33

7 27556.34 1.24 28 6 40

4/9( 6 F°)5d6s2 5 G° 6 2263323 1.29 50 4/9

( 6 H°)5d2

( 3 F) ( 8 K°)6s 7 22647.94 1.34 22 9 K°

4/9( 6 H°)5d2

( 3 F) ( 8 G°)6s 4 22696.82 1.487 35 9G°

4/9( 6 H°)5d2

( 3P) ( 8G°)6s 8 22767.83 1.34 43 9G°

4/9( 6 H°)5d6s2 4 22938.03 1.07 24 5 H°

4/ 10

( 5

I 6 )6s6p( 3 P8) (6,0)° 6 22956.84 1.06 or 24 ( 5 I)(3P°) 7 K°

4/9( 6 H°)5d2

( 3 P) ( 8 I°)6s 9 23271.74 1.33 41 ®I° 4/9

( 6 H°)5d2( 3 F) ( 8 G°)6s 7 23340.12 1.39 28 7G°

4/9

( 6 H°)5d2( 3 F) ( 8 F°)6s 6 23359.82 1.35 30 7 F°

4/9( 6 H°)5d2

( 3 F) ( 8 F°)6s 5 23440.46 1.36 17 9F°

4/ 10

( 5

I 6)6s6p( 3P?) (6,1)° 7 23479.77 1.13 or 35 ( 5

I)( 3P°) 7 K°

5 23552.65 1.07 or 32 ( 5 I)(3 P°) 7 I° 6 23687.87 1.076 or 29 ( 5 I)(3P°) 7 K°

4/9( 6 H°)5d2

( 3 F) ( 8 D°)6s 6 23529.01 1.41 20 9D°
275

Dy I, Odd Parity—Continued

Configuration Term J

Level (cm' 1 ) 9 Leading percentages

4/ 10

( 5

I 8)6s6p(‘Pi) (8,1)° 9 23736.60 1.22 or 97 ( 5 I)( 1 P°) 5 K°

8 23877.75 1.29 or 93 (S

I)( 1 P°) 5 I° 7 24708.96 1.26 or 83 ( 5

I)( 1 P°) 5 H°

4/9

( 6 H°)5d6s2 5 H° 3 23824.68 0.68 56 4/9

( 6 H°)5d2

( 3 F) ( 8 K°)6s 8 23832.07 1.32 24 9 K°

4/9( 6 H°)5d2

( 3 F) ( 8 K°)6s 10 23953.30 1.30 29 7 K°

4/9( 6 H°)5d2

( 3 F) ( 8 I°)6s 8 24204.19 1.30 25 7J° 4/9

( 6 H°)5d2

( 3 F) ( 8 K°)6s ' 9 2422922 1.287 33 7 K°

4/9( 6 H°)5d2

( 3 P) ( 8G°)6s 7 24353.58 1.33 41 9G°

4/9(®F°)5d6s2 5 24634.07 1.21 42 5p°

4/9

( 6 F°)5e£6s2 ? 3 24668.59 1.20 36 7 p°

4/ 10

( 5

I 6 )6s6p(3P§) (6,2)° 4 24841.04 0.90 or 38 ( 5

I)( 3 P°) 7 H°

7 24906.86 1.14 or 27 ( 5 D(3 p°) 7 r

6 24931.63 1.128 or 31 ( 5 D(3 p°) 7 r

8 24999.58 1.19 or 44 ( 5 I)(3 P°) 5 K°

5 25082.02* 1.064 or 33 ( 5

I)( 3 P°) 7 H°

4/9( 6 H°)5rf2

( 3 F) ( 8 K°)6s? 5 24993.47 1.03 23 9 K°

4/9

( 6 H°)5d2

( 3 P) ( 8 I°)6s 8 2501221 1.34 28 9 P

4/9

( 6 H°)5d2

( 3 P) ( 8 H°)6s 9 25084.80 1.277 33 9H°

4/ 10

( 5

I 5 )6s6p(3P8) (5,0)° 5 25127.52 1.04 or 35 ( 5 I)( 3P°) 7 K°

4/9( 6 F°)5d6s2 4 25203.92 1.242 40 5G°

4/9

( 6 H°)5d2

( 3 P) ( 8 I°)6s 7 25268.87 1.28 19 9r

4/9( e H°)5d2

( 3 F) ( 8 I°)6s 7 25567.53 1.288 22 7I

°

4/9

( 6 H°)5d2

( 3 P) ( 8G°)6s 6 25670.45 1.33 38 9G°

4/ 10( 5 ls)6s6p( 3 Pi) (5,1)° 4 2568720 0.94 or 47 ( 5I)(3P°) 5 H°

6 25825.83 1.00 or 31 ( 5 I)( 3P°) 7 K°

5 25912.63 0.98 or 39 ( 5 I)(3P°) 3 H°

4/9

(6 H°)5d2

( 3 F) ( 8 K°)6s? 8 25760.39 1.263 23 7 K°

4/9

( 6 H°)5d2

( 3 F) ( 8 F°)6s 4 25761.77 1.35 28 7 p°

4/9

( 6 H°)5d2

( 3 F) ( 8 I°)6s 10 25774.39 1.33 34 9F

6 25868.00 1.30 4/9

( 6 H°)5d2

( 3 F) ( 8 F°)6s 6 25920.88 1.33 17 7 F°

4/9( 6 F°)5d6s2 5 2613521 1.22 34 5 H°

4/ 10( 5 l5)6s6p(3P8) (5,2)° 3 26607.16 0.58 or 59 ( 5 D(3 P°) 7 r

4 2699827 0.86 or 44 ( 5

I)( 3 P°) 7 H°

5 27109.93 1.01 or 21 ( 5

I)( 3P°) 7 I° 6 2719920 1.16 or 30 ( 5

I)( 3P°) 5 I° 7 27427.08 1.06 or 48 ( S I)(3P°) 5 K°

4/ 10( 5

I 4 )6s6p(3P8) (4,0)° 4 26662.41 0.59 or 64 ( 5

I)( 3P°) 7 K°

8 26868.07 1.24

3 26886.01 1.02 9 27014.02 1.23 4/9

( 6 F°)5d2

( 3 F) ( 8 F°)6s 6 27190.74 1.263 33 9F°

4/9( 6 H°)5d2

( 3P) ( 8G°)6s 7 27316.49 1.32 35 7G°

8 27319.08 1.22
276

Dy I, Odd Parity—Continued

Configuration Term J

Level (cm -1

) 9 Leading percentages

4/ 10( 5

I 4 )6s6p( 3P!) (4,1)° 3 2732126 0.58 or 25 ( 5

I)( 3P°) 5 H°

5 27685.87 0.77 or 44 ( 5 I)( 3P°) 5 K°

4 27751.46 0.81 or 47 ( 5

I)(3 P°) 3 H°

3 2761*3.57 1.17 4/9

( 6 F°)5d6s2 4 27659.02 1.17 32 5G°

4 27711*.33 1.032

4/ 10

( 5

I 7 )6s6p( 1 P5) (7,1)° 8 27817.99 1.21 or 94 ( 5

I)( 1 P°) 5 K°

7 27834-93 1.22 or 85 ( 5 I)(ip°) 5!° 6 28119.91* 1.198 or 73 (“DOP0

) 5 H°

7 27837.51* 1.26 4/9

( 6 H°)5d2

( 3P) ( 8 I°)6s 8 27851.1*3 1.24 28 7J° 4/9

( 6 H°)5d2

( 3 F) ( 8 L°)6s 7 27984-50 1.24 27 9L°

8 28029.68 1.09 8 28177.11* 1.27

6 28197.66 1.10

4/ 10( 5

I 4 )6s6p(3PS) (4,2)° 2 281*07.01 0.06 3 28691*.51 0.55 or 52 ( 5

I)( 3P°) 5 H°

4 28923.05 0.78 or 27 ( 5 I)( 3 P°) 3 H°

5 29051*.36 0.84 or 39 ( 5 I)( 3P°) 3 I° 6 291*1*7.11 0.90 or 62 ( 5 I)( 3P°) 3 K°

8 28518.30 1.26 8 2879526 1.22

7 28822.50 1.34 9 29119.11 1.20

7 29161.38 1.24

7 29878.69 1.32 6 30426.59 1.227

7 30528.36 1.22 8 30544-57 1.22

7 30566.07 1.39

4/10

( 5 Ie)6s6p( 1 P!) (6,1)° 7 30711.70 1.09 6 30778.96 1.17 or 82 ( 5 I)(iP) 5 I° 5

4/9( 6 F°)5c?2

( 3 F) ( 8 H°)6s 6 30840.73 1.269 11 7 H°

5 30904-89 1.286

5 30946.73 1.267 7 31132.30 1.289

•

5 31200.96 1.31

7 3122929 1.207 6 31341.39 1.145 6 31399.49 1.255

5 31410.95 1.242

7 311*23.02 1.18

7 31519.57 1.22 5 31522.73 1.268
277

Dy i. Odd Parity—Continued Dy I, Odd Parity—Continued

Configuration Term J Level (cm -1

) 9 Configuration Term J Level (cm -1) 9

8 3154.7.01 4/ 10

( 5 l4)6s6p( 1 P!) (4,1)° 5 34470.70 0.915 6 31555.97 1.26 4

7 3158028 1.19 3

7 31698.32 1.131 4 34486.89 1.213

5 31763.85 1.32 5 34488.42 1.20

7 31878.42 1.208 5 34662.11 1.16

9 31900.74 1.24 4/10

( 5 I)5d6p? 7 34695.42 1.32

7 31946.72 1.25 4 34720.68 0.761

7 32016.83 1.30 4/ 10

( 5 I)5d6p? 8 34755.07 0.18

6 32082.00 1.284 6 34770.30 1.195

6 32111.44 1.119 6 34793.49

6 32126.16 1.23 8 34803.87 1.174

5 32263.16 1.26 7 34921.87 1.198

5 32359.02 1.223 6 34938.33 1.22

6 32431.61 1.121 4/ 10

( 5 I)5d6p? 7 34975.00 1.28

7 32564-97 4/ 10

( 5 I)5d6p? 8 35029.50 1.29

6 32607.88 1.227 4/ 10

( 5 I)5d6p? 8 35082.98 1.28

9 32711.90 1.203 3 3510723 1.033

6 32790.66 1.175 4/ 10

( 5 I)5d6p? 7 3510728 1.30

6 3283429 1.195 3 35136.67 1.06

5 32889.19 1.138 4/ 10

( 5 I)5d6p? 9 3522127 1.236

7 3292020 1.235 3 3523123 0.958

9 32927.76 1.187 4 35316.31 1.272

6 32970.87 1.177 4/ 10

( 5 I)5d6p? 8 35450.1 71 4/ 10

( 5 I)6s7p 8 3551827 1.277 4/ 10

( 5

I 5 )6s6p( 1 P?) (5,1)° 6

5 33025.64 1.01 4/ 10

( 5 I)6s7p 9 35580.841

4 33324-06 0.89 8 35777.79 1.21

5 3313924 0.89 4/10

( 5 I)5d6p? 7 35802.73 1.23

8 33165.77 1.25 8 35894-36 1.22

7 33311.52 1.296 8 35899.94 1.23

8 33358.831 4/ 10

( 5 I)5d6p? 10 35945.02 1.22

5 3365223 1.16 4/ 10

( 5 I)6s7p 10 36094-42 1.288

8 33721.52 1.25 7 36248.02 1.30

5 33788.79 1.31 4/ 10

( 5 I)5d6p? 9 36260.1

1.183

5 33871.70 1.17 4/ 10

( 5 I)5rf6p? 8 36288.48 1.25

5 33947.13 1.307 4/ 10

( 5 I)5d6p? 7 36316.42 1.23

4 33952.33 1.30 9 36341.53 1.282

4 34038.46 1.30 4/ l0

( 5 I)6s7p 9 3644021

4 34137.43 1.18 7 36441.99 1.174

7 34213.65 6 36462.09 1.09 6 3 4159.56 1.26 8 36534.04 1.24 4 34-159.80 1.14 4/ 10

( 5 I)6s7p 8 36546.78 1.267

5 34400.67 1.123 8 36618.341

. 4/ 10

( 5 I)5d6p? 10 36640.90 1.17
278

Dy I, Odd Parity—Continued Dy I, Odd Parity—Continued

Configuration Term J

Level (cm' 1 ) 9

Configuration Term J

Level (cm 1 ) 9

4/ 10( 5 I)5d6p? 10 36868.73 1.178 4/ 10

( 5 I)5d6p? 7 38362.65

8 36892.10 1.188 4/10

( 5 I)5d6p? 7 3842129 1.33

8 370il.02 1.19 8 38438.87 1.27

4/ 10

( 5 I)5d6p? 7 37073.86 1.288 4/ 10

( 5 I)5d6p? 9 3856323 1.254

4/ 10

( 5 I)5d6p? 9 3709046 1.208 7 38779.77

4/ 10( 5 I)5d6p? 8 37146.54 1.233 8 3881446"!

4/ I 0

( 5 I)5d6p? 11 37182.98 1.23 4/ 10(5I)5d6p? 8 39135.32 1194

4/ l 0( 5 I)5d6p? 8 37355.00 1.12 4/10

( 5 I)5d6p? 10 39182.40 1.28

7 37360.01 1.185 6 3918823

7 37366.93 7 3932528

4/ , 0( 5 I)5d6p? 7 37471.09"! 4/ 10

( 5 I)5d6p? 8 39398.10 1.228

7 37587.58 1.23 4/ 10

( 5 I)5d6p? 9 3960247 1.28

4/ 10

( 5 I)5d6p? 8 3763526? 4/ 10

( 5 I)5d6p? 8 3971420 1.184

8 3764628 1.09 4/ 10

( 5 I)5d6p? 9 39903.34 1.28

4/ 10( 5 I)5d6p? 8 37721.06 1.199 4/ 10

( 5 I)5d6p? 9 40030.48 1.192

4/ 10( 5 I)5d6p? 9 37836.50 1.18 4/9

( 6 H°)5d6s7s 9 40594-03 1.41

4/ 10( 5 I)5d6p? 8 37843.38 1.265 8 40605.98 1.11

10 38019.12 1.152 4/9

( 6 H°)5d6s7s 8 41136.59 1.35

4/ 10

( 5 I)5d6p? 9 38102.92 1.19 6 41577.18

4/ 10( 5 I)5e£6p? 8 38202.48 1.313 7 41642.79

4/ 10( 5 I)5d6p? 10 38247.38 1.22 4/ 10

( s I)5d6p? 6 41656.46 1.21

7 38251.55

6 42375.03 1.28

4/ 10( 5 I)5d6p? 10 38297.52 1.244 5 42479.83 1.07

4/ 10( 5 I)5d6p? 7 38342.48 1.323 8 38358.88 1.095 Dy ii ( 5

I 8) 6si /2 ( 8, l Limit

_|

47900

1
279

Dy II

(Tb I sequence; 65 electrons) Z=66

Ground state (ls 2 2s 2 2p fi 3s 2 3p6 3d 10 4s 2 4pfi 4d 10 5s 2 5pB

) 4/*°( 5 I 8 )6s (8,V2) 17/2

Ionization energy 94100± 600 cm

" 1 11.67± 0.08 eV

Identified even configurations 4/ 10 6s, 4/'°5d, 4/ 9 6s6p, 4/ 9 5c?6p

Identified odd configurations 4/ 9 5e?6s, 4/ 9 6s2

, 4/ 9 5c?

2

, 4/ 10 6p

In the earlier work on this spectrum, one or more real energy differences were found or confirmed by Paulson [1914], Meggers [1942], Blank [1952], and Corliss and Corliss [1953].

Blank’s analysis was greatly aided by his measurements of the Zeeman patterns of 510 lines. He classified 100 lines according to four wavenumber differences, but his Zeeman data showed

that the differences involved eight separate low levels. The J and g values of these levels indicated 6 I and 4 1 terms, as expected for a 4/'°6s ground configuration. Blank concluded that

the 6 1 17/2 level was probably the ground level. Corliss and Corliss [1953] derived a single

connected system consisting of the four lowest levels and a number of upper odd levels. Their

analysis yielded classifications for 80 of the stronger Dy n lines tabulated by Meggers, Corliss,

and Scribner [1961],

Vander Sluis and McNally [1970] at Oak Ridge and Conway and Worden [1970, 1971] at the Lawrence Laboratory made new observations of Dy I and Dy n using electrodeless lamps

containing the separated isotope 162 Dy. The UCRL report by Conway and Worden has more

than 9000 lines assigned to Dy ii in the range 2300-11400 A. Conway and Worden extended

the analysis to include all ten levels of the ground subconfiguration 4/ 10

( 5 I)6s, the two levels of

4/ 10

( 5 F 5 )6s, two other low even levels, and 214 upper odd levels. About 1000 lines were

classified. The analysis was partly based on new measurements of Zeeman patterns, and g

values were obtained for most of the levels. In a separate investigation, Vander Sluis and

McNally used Zeeman spectra photographed at MIT to derive g values for the ten lowest

levels of 4/'°6s and for 77 upper odd levels. Wyart has greatly extended the analysis to include about 550 levels. He worked with the

line list of Conway and Worden, and with new data including additional measurements of

Zeeman patterns. Wyart has also made extensive calculations that are the basis for the

interpretation of the levels given here. All eigenvector percentages are from his results. Conway and Worden state the uncertainty of their three-place g values to be ±0.003,

whereas the standard deviations of the g values obtained for the 4/ 10

( 5 I)6s levels by Vander

Sluis and McNally lie between 0.001 and 0.016. We have taken suitable averages of g values

included in both sets of measurements. The measurements of Vander Sluis and McNally for

the high odd levels were usually weighted according to the number of determinations. The g

values given by Wyart to the nearest 0.005 have been rounded to two places to distinguish

them from the generally more accurate three-place values.

The J x j-coupling of the 4/'°6s ground configuration, as exhibited by the pairing of the low

levels, was noted by Conway and Worden. Vander Sluis and McNally pointed out the good

agreement of the experimental g values with theoretical J ^’-coupling values. No eigenvector

percentages in this scheme are available, but we have listed the leading percentages in LS

coupling after the word “or.” The percentages are from Wyart’s recent calculation of (4/'°6s+

4/ 10 5d) including configuration interaction [1976]. The known 4/ 10 5d levels belong mainly to the

4/ 10

( 5 I)5d subconfiguration; Spector [1971] located several of the low levels of this group, but

the detailed interpretation required experimental g values and an expansion of the analysis

[Wyart, 1971; 1973; 1976],

Wyart [1972b] has been able to assign all but a few of the 141 high even levels (36000-

54000 cm' 1 ) to eigenvectors of (4/

9

( 6 H

0

, 6 F

0 )6s6p+4/ 9

( 6 H°,6 F°)5d6p). All of the assigned levels of this group have Js* 7

/2 . Wyart notes that transitions from these levels to levels of 4/ 9 (5d+
280 Dy II —Continued

6s ) 2 account for the strongest lines originating on high even levels, although levels of 4/ 10 6s

and 4/'°5d must also lie in this region.

The eigenvector percentages for the odd levels are from Wyart’s calculation of (4/ 9 (5d+

6s) 2 +4/ lft 6p), the three configurations based on 4/

9 being limited to the subconfigurations from

the 4/

9 6 H° and 6 F° terms [Wyart, 1972a], All interpreted odd levels have J^ 9k. An extension

of the calculation to include levels based on higher terms of 4/

9 would probably allow

interpretation of many of the levels above 30000 cm

-1

; some 240 uninterpreted odd levels are

listed, the bulk lying between 32000 and 42000 cm 1

. Wyart notes, however, that a meaningful

extension of his calculation would require matrices of order greater than 500. Sugar and Reader determined the quoted ionization energy.

References

Blank, J. M., Thesis, Mass. Inst. Tech., Cambridge, Mass., 93 pp. (1952). EL W ZE

Conway, J. G., and Worden, E. F., Univ. Calif. Radiation Lab., Berkeley, UCRL-19944, 613 pp. (1970). (Available from

National Technical Information Service, Springfield, Va. 22161.) EL ND CL W ZE PT

Conway, J. G., and Worden, E. F., J. Opt. Soc. Am. 61, 704 (1971). EL ND CL W ZE PT

Corliss, C. H., and Corliss, E. L. R., unpublished material (1953); see Meggers et al. (1961). King, A. S., Astrophys. J. 72, 221 (1930). W

King, A. S., Conway, J. G., Worden, E. F., and Moore, C. E., J. Res. Nat. Bur. Stand. (U.S.) 74A, 355 (1970). W

Meggers, W. F., Rev. Mod. Phys. 14, 96 (1942). EL

Meggers, W. F., Corliss, C. H., and Scribner, B. F., Tables of Spectral Line Intensities, Nat. Bur. Stand. (U.S.), Monogr.

32, Part I, 473 pp. (1961); more recent data are given in the second edition, Nat. Bur. Stand. (U.S.), Monogr. 145, Part I, 403 pp. (1975). EL CL

Paulson, E., Astrophys. J. 40, 298 (1914). EL

Spector, N., J. Opt. Soc. Am. 61, 672A (1971). EL

Sugar, J., and Reader, J., J. Opt. Soc. Am. 55, 1286 (1965). IP Vander Sluis, K. L., and McNally, J. R., Jr., J. Opt. Soc. Am. 60, 1209 (1970). EL CL W ZE

Wyart, J. F., C. R. Acad. Sci., Ser. B 272, 933 (1971). EL ND ZE PT

Wyart, J. F., Physica (Utrecht) 61, 182 (1972a). EL ND PT

Wyart, J. F„ Physica (Utrecht) 61, 191 (1972b). EL ND ZE PT

Wyart, J. F., Thesis, Univ. Paris-Sud, Orsay, 194 pp. (1973). EL ND ZE PT

Wyart, J. F., unpublished material (1975, 1976). EL ZE

Wyart, J. F„ Physica (Utrecht) 83C, 361 (1976). EL ND ZE PT

[July 1976]

Dy II, Even Parity

Configuration Term J

Level

(cm” 1

) g Leading percentages

4/ 10

( 5

I 8)6si/2 ( 8J/2 ) 17

/ 2 0.00 1.290 or 95 ( 5 I) 6

I 15

/ 2 828.31 1.203 or 72 ( 5 I) 4

I

4/ 10( 5

I 7 )6si/2 (V/2) i5/2 4341.10 1.225 or 75 ( 5 I) «I

13/2 4755.66 1.130 or 50 ( 5

I) 4I

4/ 10( 5

I 6 )6si/2 (6J/2) ll /2 7463.88 1.015 or 69 ( 5 I) 6

I 13/2 7485.09 1.134 or 49

4/ 10( 5

I 5 )6s 1 /2 (5J/2)

9

/2 9432.07 0.825 or 82 ( 5 I) 6

I ii/2 9870.99 0.997 or 66 ( 5I) 4

I

4/ 10

( 5

I 4 )6si/2 (4J/2) 7

/ 2 10953.94 0.470 or 92 ( 5 I) 6

I 9

/

2

11801.01 0.756 or 80 ( 5 I) 4

I

4/ 10( 5 Fs)6s 1 /2 (5J/2) “/2 13338.27 1.413 or 85 ( 5 F) 6 F

9

/ 2 14126.93 1.32 or 62 ( 5F) 4 F

4/ 10( 5 I)5d 6

I 17

/2 14845.91 1.25 78 13 (51) e K

4/ 10( 5 I)5d 6 H 15/2 14952.14 1.30 56 28 ( 5 I) 6

I

4/ 10

( 5 I)5d 6G 13/2 15691.99 1.34 65 21 ( 5 I) 6 H
281

Dy II, Even Parity—Continued

Configuration Term J

Level (cm -1

) 9 Leading percentages

4/ 10( 5 S2 )6si/2 (2.V2) 5

/2 15889.87 1.85 or 81 ( 5S) 6 S

3

/

16758.92 1.72 or 72 ( 5S) 4 S

4/ 10

( 5 F4)6si/2 (4, 1 /2) 9

/

15979.27 1.40 or 70 (5 F) e F

? /2 16418.93 1.309 or 52

4/ 10

( 5 I)5d 6 K 19

/ 2 16117.40 1.24 75 12 ( 5 I) 6 L

4/10

( 5 I)5d 6 L 21/2 17406.59 1.24 94 4 ( 3 K2) 4 M

4/ 10( 5 I)5d 4 K 17/ 2 17589.52 1.20 52 23 ( 5 I) 6 K

4/ 10( 5 F3 )6si/ 2 (3,V2) 5

/2 17779.98 1.29 or 78 ( 5 F) 6 F

7

/

17912.80 1.30 or 52 ( 5F) 4 F

4/ 10

( 5 I)5d 4 L 19

/ 2 17788.82 1.17 62 16 ( 5 I) 6 K

4/ 10

( 5 I)5d 13/2 18219.72 1.24 29 6

I 25 ( 5 I) 6G

4/ 10( 5 I)5d 1S/ 2 18234.95 1.24 34 6H 33 ( 5 I) 6

I 4/10

( 5 I)5d 6G n/2 18866.51 1.26 48 29 ( 5 I) 6 H

4/ 10

( 5 I)5d 11/2 20700.59 1.16 36 4K 27 ( 5 I) 6 K

4/ 10( 5 I)5d 13

/ 2 20748.43 1.17 35 6

I 29 ( 5 I) 4 H

4/ l0

( 5 I)5d 6 K 15/2 21076.07 1.13 46 16 ( 5 I) 4

I 4/ 10

( 5 I)5d n/2 21177.84 1.15 42 6

I 23 ( 5 I) 6G

4/ 10

( 5 I)5d 4

I 15/ 2 21338.35 1.18 50 24 ( 5 I) 6I 4/ 10

( 5 I)5d 17

/ 2 21627.53 1.12 39 4 L 30 ( 5 I) 6 K

4/ 10

( 5 I)5d 6 L

19 /2 21806.92 1.17 69 25 ( BI) 4 L

4/10

( 5 I)5d 9/2 21813.12 1.10 41 6H 36 ( 5 I) 6G

4/ 10( 5 I)5d 13

/ 2 22116.32 1.20 40 4 H 31 ( 5 I) 6 H

4/ 10

( 5 I)5d n/2 23309.80 1.105 32 6 H 24 ( 5 I) 6

I 4/ 10

( 5 I)5d 13

/ 2 23375.41 0.994 29 6K 20 ( 3K2)6s 4 K

4/ 10

( 3 K2)6s is/2 23479.89 1.00 26 4 K 23 ( 5 I)5d 6 K

4/10

( 5 I)5d 6

I 9

/

23495.20 1.00 48 34 ( 5 I) 6G

4/10( 5 I)5d 6 L 15/2 23840.25 1.036 59 19 ( 5 I) 4 K

4/ 10

( 5 I)5d 6 H 7 /2 23976.76 0.837 46 24 ( 5 I) 6G

4/ 10

( s I)5d 15

/ 2 24685.63 1.10 34 4 K 32 ( 5 I) 6 K

4/ 10( 5 I)5d 17

/ 2 25051.49 1.10 48 4 L 42 ( 5 I) 6 L

4/ 10( 5 I)5d 6K u/2 25086.95 0.89 63 11 ( 5 I) 6I 4/ 10

( 5 I)5d 9/2 25214.39 1.01 38 6H 19 ( 5 I) 6G

4/ 10( 5 I)5d 6

I

7

/

25292.49 0.743 55 32 ( 5 I) 6G

4/ 10( 5 I)5d 6 L l 3/2 25746.58 0.888 70 7 ( 5I) 4 L

4/ 10( 5 I)5d 6 H 5

/2 25933.69 0.45 62 25 ( 5 I) 6G

4/ 10( 5 I)5d 7/

26550.05 0.91 35 6G 35 ( 5 I) 6 H

4/ 10( 5 I)5d 6G 5

/27494.66 0.75 66 21 ( 5 I) 6 H

4/ 10

( 5 I)5d 4 L 15/2 27519.67 1.00 62 22 ( 5 I) 6 L

4/ 10( 5 I)5d 6G 3/28214.92 0.04 90 4 ( 3 H4) 4 F

4/9

( 7 H°)6s6p(3P°) 8 G 15

/ 2 36212.19 1.405 45 4/9

( 7 H°)6s6p(3P°) 8 H 17/2 36522.90 1.373 59 4/9

( 7 H°)5d ( 7 H°)6p 15

/2 37817.31 1.333 20 8G

4/9( 7 H°)6s6p(3 P°) 13/2 37878.55 1.303 20 6H

225-298 C - 78 - 19
Dy II, Even Parity—Continued

Configuration Term J

Level (cm ') 9 Leading percentages

4/9

( 7 H°)5<2 ( 7 H°)6p 17

/ 2 38402.40 1.326 23 8 H

4/9

( 7 H°)5d ( 7 H°)6p 15

/ 2 38427.36 1.317 19 8 H

4/9

( 7 H°)5d ( 7 H°)6p 13

/ 2 38939.69 1.381 22 8G

4/9

( 7 H°)6s6p(3 P°) 13

/ 2 39896.72 1.24 20 8 H

13

/ 2 39944.24 1.23 4/9

( 7 H°)6s6p(3P°) 8

I 19

/ 2 40158.04 1.36 69 4/9

( 7 H°)5d ( 7 H°)6p n/2 40194.02 1.34 18 8H

4/9( 7 H°)6s6p(3P°) 17

/ 2 40455.73 1.326 39 6

I 4/9

( 7 H°)6s6p(3 P°) 15/2 40516.80 1.35 17 8

I 4/9

( 7 H°)6s6p(3P°) 15/ 2 40604.11 1.295 24 4

I

15

/ 2 40626.42 1.093 4/9

( 7 H°)5d ( 7 H°)6p 19/ 2 40807.20 1.332 44 8

I 4/9

( 7 H°)6s6p(3 P°) n/2 40841.63 1.326 20 8 H

4/9( 7 H°)6s6p(3P°) 13/ 2 41004.07 1.26 15 6

I 4/9

( 7 H°)6s6p(3P°) 1S/2 41111.11 1.32 40 6H

4/9

( 7 H°)5d ( 7 H°)6p i7

/ 2 41583.90 1.33 25 e

I 4/9

( 7 H°)6s6p(3 P°) 13/2 41878.48 1.314 16 4 H

4/9

( 7 H°)5d ( 7 F°)6p n/2 42083.59 1.33 24 8D

4/9( 7 H°)6s6p(3 P°) 13

/ 2 42137.31 1.33 32 6G

n/2 42150.67 1.10 4/9

( 7 H°)5d ( 7 H°)6p 9

/ 2 42256.43 1.23 27 8H

4/9

( 7 H°)5d ( 7 H°)6p 18/2 42289.33 1.348 30 6G

4/9

( 7 H°)5d ( 7 H°)6p 19/2 42478.98 1.31 35 8

I

4/9( 7 H°)5d ( 7 H°)6p 15

/ 2 42550.09 1.34 26 6 H

4/9( 7 H°)5d ( 7 H°)6p 11/2 42741.69 1.32 12 8 H

4/9( 7 H°)6s6p(3P°) u/2 42813.08 1.208 13 4G

4/9( 7 H°)5d ( 7 F°)6p 13/2 42883.01 1.367 19 8F

4/9( 7 H°)6s6p(3 P°) 9

/ 2 42911.59 1.21 33 8H

4/9( 7 H°)5d ( 7 H°)6p 15/2 43002.98 1.33 20 8 H

4/9

( 6 H°)5d ( 7 H°)6p 17

/ 2 43066.19 1.343 35 8

I

4/9( 6 H°)6s6p(3 P°) 13

/ 2 43422.06 1.307 19 8

I

4/9

( 6 F°)6s6p( 3P°) 8 D U/2 43689.99 1.401 45 4/9

( 6 H°)6s6p(3 P°) 1S

/ 2 43794.35 1.298 20 8

I 4/9

( 6 H°)5d ( 7 H°)6p 7/2 43838.10 1.04 33 8 H

4/9( 6 H°)5d ( 7 G°)6p 15/2 43891.33 1.31 21 6 H

4/9

( 6 H°)6s6p(3P°) 13/2 44049.22 1.312 12 6H

4/9( 6 H°)6s6p(3P°) 17

/ 2 44074.41 1.31 25 8

I

4/9

( 6 H°)5d ( 7 I°)6p 8 K 21

/ 2 44156.98 1.317 73 4/9

( 6 H°)5d ( 7 H°)6p 13

/ 2 44189.52 1.31 20 6 H

4/9

( 6 H°)6s6p(3P°) “/a 44331.36 1.242 16 6

I 4/9

( 6 H°)5d ( 7 H°)6p 9

/ 2 44352.01 1.17 22 8

I

4/9(6 H°)5d ( 7 I°)6p 19

/ 2 44501.98 1.32 43 8

I

4/9

( 6 H°)6s6p(3P°) 7/ 2 44529.45 1.00 ? 8 H

4/9( 6 H°)6s6p(3 P°) 17

/ 2 44545.25 1.28 24 8

I
Dy II, Even Parity—Continued

Configuration Term J

Level (cm' 1 ) 9 Leading percentages

4/9

( 6 H°)5d ( 7 H°)6p

i5/2 44653.18 1.318 12 6 H

4/9( 6 H°)5d ( 7 H°)6p

9

/ 2 44737.52 1.38 11 8G

4/9( 6 H°)5d ( 7 H°)6p

13/2 44812.00 1.39 14 8G

4/9( 6 H°)6s6p(3P°) m/ 2 44903.87 1.31 15 4 H

4/9

( 6 F°)6s6p(3 P°) 13/a 45123.11 1.323 19 8 F

4/‘°( 1 K7)6Sl/2? 15

/ 2 45132.74 1.09 4/9

( 6 H°)5d ( 7 H°)6p

15

/ 2 45139.88 1.24 26 8

I 4/9

( 6 H°)5d ( 7 I°)6p

17

/2 45240.02 1.33 31 8 H

4/9( 6 H°)5d ( 7 F°)6p

11 12 45241.75 1.34 11 8D

4/9

( 6 H°)5d ( 7 I°)6p

15

/ 2 45317.04 1.28 29 6

I

4/9( 6 H°)5d ( 7 H°)6p

1S/2 45356.53 1.448 13 8 H

4/9( 6 H°)6s6p(3 P°) 9

/2 45427.49 1.26 13 8 D

4/9

( 6 H°)5d ( 7 F°)6p

11/2 45545.68 1.36 24 6 F

4/9( 6 H°)5d ( 7 I°)6p

19/2 45701.64 1.29 36 8 K

4/9( 6 H°)5d ( 7 F°)6p

13

/ 2 45773.90 1.29 23 8 F

4/9

( 6 H°)5c£ ( 7 H°)6p

9

/ 2 45800.00 1.282 28 6G

4/9( e H°)5d ( 7 K°)6p

8 K 21/2 45934.94 1.30 53 4/9

( 6 H°)5d ( 7 K°)6p

19/2 46066.65 1.24 25 8 K

4/9

( 6 H°)5d ( 7 G°)6p

15/2 46082.83 1.303 13 8G

4/9

( 6 H°)6s6p(3P°) 9

/ 2 46091.32 1.278 19 6G

4/9

( 6 H°)6s6p(3P°) 9

/ 2 46161.85 1.305 13 4G

4/9

( 6 H°)5d ( 7 I°)6p

18/2 46220.92 1.310 16 8

I 4/9

( 6 H°)5d ( 7 I°)6p

17/2 46256.77 1.275 22 6

I

4/9

( 6 H°)5d ( 7 I°)6p

l3/2 46490.31 1.229 23 eH

4/9

( 6 H°)6s6p(3 P°) 11 12 46498.62 1.275 14 4 H

4/9( 6 H°)5d ( 7 F°)6p

11 h 46647.75 1.338 10 8D

4/9

( 6 H°)5d ( 7 I°)6p

l 7

/

46694.14 1.274 20 8I

4/9

( 6 H°)6s6p(3 P°) 18/2 46779.06 1.297 14 8

I

4/9

( 6 H°)5d ( 7 H°)6p

7

/2 46798.32 1.11 14 6G

4/9( 6 H°)5d ( 7 F°)6p

15/2 46853.71 1.28 21 8G

4/9

( 6 H°)5d ( 7 H°)6p

18/2 46943.02 1.23 27 8

I

4/9( 6 H°)5d ( 7 H°)6p

11/2 46976.07 1.24 12 8 H

4/9( 6 H°)5d ( 7 H°)6p H/2 47023.09 1.32 6

8G

4/9

( 6 H°)6s6p(3P°) 15/2 47091.91 1.35 41 6

I 4/9

( 6 H°)5d ( 7 K°)6p

17

/ 2 47208.15 1.24 14 6 K

4/9( 6 H°)5d ( 7 H°)6p

18/2 47357.74 1.22 17 6

I

4/9( 6 F°)6s6p(3 P°) n/2 47401.40 1.22 18 8G

4/9

( 6 H°)5d ( 7 H°)6p

9

/

47462.43 1.32 13 8G

4/9

( 6 F°)6s6p(3P°) 15/2 47597.73 1.262 33 8G

4/9

( 6 H°)5d ( 7 G°)6p

i ?

/ 2 47718.75 1.278 19 8 H

ii

/ 2 47833.92 1.16 4/9

( 6 H°)5d ( 7 K°)6p

8 L 28/2 47960.83 1.31 100 4/9

( 6H°)5d ( 7 G°)6p

17 /2 48022.12 1.248 17 8 H

4/9

(6 H°)5d ( 7 H°)6p

I 8/2 48035.88 1.31 86

I
284

Dy II, Even Parity—Continued

Configuration Term J

Level (cm -1

) 9 Leading percentages

4/9( 6 H°)5d ( 7 I°)6p 15

/ 2 48052.16 1.29 14 8H

4/9( 6 H°)5d ( 7 K°)6p 21

/ 2 48059.91 1.28 34 8 K

4/9( 6 H°)5d ( 7 I°)6p 19

/ 2 48069.10 1.273 34 6 K

4/9

( 6 H°)5d ( 7 I°)6p 1X /2 48240.94 1.28 23 8K

4/9

( 6 H°)5d ( 5 K°)6p 19

/ 2 48346.29 1.23 26 4 L

4/9( 6 H°)5d ( 7 I°)6p 11 h 48469.08 1.29 13 6 H

4/9( 6 F°)6s6p(3P°) 13

/ 2 48487.13 1.46 33 6G

4/9(6 H°)5d ( 7 G°)6p l5

/ 2 48489.05 1.35 17 8G

4/9( 6 H°)6s6p(3P°) 9

/ 2 48684.98 1.20 15 6G

4/9

( 6 H°)5d ( 7 I°)6p 13

/ 2 48831.17 1.27 10 6

I

13

/ 2 48844.85 1.26

4/9( 6 F°)6s6p(3 P°) X1

/2 48863.45 1.32 18 ep

4/9

( 6 H°)5d ( 5 I°)6p 15/2 48950.09 1.222 12 6 H

4/9( 6 H°)5d ( 7 G°)6p 15

/ 2 48988.85 1.27 19 8G

1X

/2 49058.03 1.38

4/9( 6 F°)5d ( 7 F°)6p 18/ 2 49132.94 1.23 12 8G

4/9( 6 H°)5d ( 7 K°)6p 15

/ 2 49233.16 1.23 15 6K

4/9( 6 H°)5d ( 7 K°)6p 13

/ 2 49340.48 1.253 9

8 K

U/2 49462.33 1.29

4/9( 6 H°)5d ( 5 I°)6p 17

/ 2 49537.65 1.222 27 6

I

4/9( 6 H°)5d ( 5 K°)6p 19

/ 2 49544.70 1.278 20 6 K

4/9( 6 H°)6s6p(3 P°) 13

/ 2 49603.11 1.32 29 6

I

11 h 49607.50 1.15

4/9

( 6 H°)5d ( 5 I°)6p 17

/ 2 49675.74 1.19 18 4 K

4/9( 6 H°)5d ( 5 H°)6p 18/2 49680.29 1.35 18 6G

4/9( 6 H°)5d ( 7 K°)6p 15/2 49813.64 1.273 9

6 K

4/9( 6 H°)5d ( 7 K°)6p 13

/ 2 49856.57 1.23 9

6

I

4/9( 6 H°)5d ( 7 K°)6p 19

/ 2 50017.73 1.278 39 8

I

13

/ 2 50051.48 1.26

13

/ 2 50101.90 1.11

4/9( 6 H°)5d ( 5 H°)6p 15/2 50129.27 1.212 18 4

I

4/9( 6 H°)5d ( 7 G°)6p 15/2 50206.50 1.21 14 8 H

13

/ 2 50408.821 1.18

4/9( 6 H°)5d ( 7 K°)6p 17

/ 2 50457.94 1.28 20 8

I

4/9

( 6 H°)5d ( 5 H°)6p 1S

/ 2 50521.44 1.244 17 4

I

1 1/2 50768.52 1.35 4/9

( 6H°)5d ( 7 G°)6p 15/ 2 50783.98 1.322 12 8 H

4/9

( 6 H°)5d ( 5G°)6p 13

/2 50858.43 1.30 19 4 H

4/9

( 6 H°)5d ( 7 G°)6p 13

/2 51087.71 1.31 18 8G

4/9

( e H°)5d ( 5 I°)6p 15

/ 2 51124.24 1.23 35 4

I

17

/ 2 51406.04 1.28 4/9

( 6 H°)5d ( 7 K°)6p 8 L 21/2 51593.35 1.25 46 4/9

( 6 H°)5d ( 7 K°)6p 19

/ 2 51640.22 1.25 25 8 K

4/9( 6 H°)5d ( 5 I°)6p 17

/ 2 51716.65 1.232 18 4K
285

Dy II, Even Parity—Continued

Configuration Term J

Level (cm -1

) 9 Leading percentages

4/9( 6 H°)5d ( 7 K°)6p 13

/ 2 52008.95 1.22 9

8 K

4/9(®H°)5d ( 7 K°)6p l5/2 52395.07 1.26 15 8

I

4/9 (®H°)5d ( 5 H°)6p 6

I 17

/ 2 53002.56 1.26 71

4/9(®H°)5d ( 5 K°)6p 6 L 21/ 2 53641.33 1.23 69

4/9(®F°)5d ( 7 H°)6p 17

/ 2 53738.08 1.27 13 8 H

Dy III ( 5 Is) Limit 94100

Dy II, Odd Parity

Configuration Term j

Level (cm -1

) 9

Leading

percentages

4/9(®H°)5d ( 7 H°)6s 8 H° i7

/ 2 1059A.19 1.400 83

15/ 2 11394.91 1.383 67

13/2 12674.69 1.350 56

1J

/ 2 1434721 1.302 55

9

/ 2 16015.40 1.193 61

7 /2

S

/2

3

/2

4P 6s2 6 H° 15/2 1233629 1.333 90

13/2 15822.15 1.275 64 H/2 18121.46 1.215 - 90

9

/ 2

7 /2

5

/2

4/9(®H°)5d ( 7 I°)6s 8J° 19

/ 2 13408.62 1.364 93

17

/ 2 14895.06 1.315 58

13

/ 2 17596.36 1.28 41 n/2 19183.73 1.163 59

9

/

7 /2

S

/2

4/9(®H°)5d ( 7 H°)6s 6 H° 15

/ 2 13610.71 1.33 65 4/9 (®H°)5d ( 7 F°)6s 8p° lS

/ 2 14421.87 1.438 51 4/9(®H°)5d ( 7 H°)6s 13

/ 2 15530.11 1.358 26 6H°

4/9 (®H°)5d ( 7 G°)6s 15

/ 2 16260.40 1.365 CO

00 o

o

4/9(®H°)5d ( 7 F°)6s “/2 16601.97 1.408 36 8F°

4/9 (®H°)5d ( 7 G°)6s 15 /2 16875.90 1.328

o o

00 COo

4/9(®H°)5d ( 7 K°)6s 8 K° 21 /2 16881.33 1.33 100

19

/ 2 17606.65 1.28 54

17 /2 18549.16 1.22 31

1S /2 20467.71 1.204 26

13/2 221 72.64 1.145 44 u/ 2 9

/ 2

7

/ 2

4/9(®H°)5d ( 7 H°)6s n/ 2 17007.10 1.317 39 6 H°

4/9( 6 H°)5d ( 7 I°)6s ®r 17

/2 17036.55 1.29 62 4/9

( 6 H°)5d ( 7 F°)6s n/ 2 18494-59 1.40 31 6F°
Dy II, Odd Parity—Continued

Configuration Term J

Level (cm *) 9 Leading

percentages

4/9(®H°)5d ( 5 I°)6s 15/ 2 18678.U 1.272 27 4 I° 4/9(®H°)5d ( 7 F°)6s 9

/

2

18738.U1 1.42 27 8F°

4/9(®F°)5d ( 7 H°)6s 9

/

2

18955.57 1.21 44 6 H

°

4/9 (®H°)5d ( 7 G°)6s 13/2 1897823 1.331 22 8G°

4/9(®H°)5d ( 5 I°)6s 6 I° l7 /2 19251.81 1.28 65 4/9(®H°)5d ( 5 H°)6s lS

/ 2 1945125 1.39 31 6H°

4/9 (®F°)5d ( 7P°)6s 8p° 9

/2 1946723 1.660 58 4/9(®H°)5d2

( 3 F) l 3

/

2

19492.15 1.436 26 8G°

4/9(®H°)5d ( 7 K°)6s 6 K

° 19

/2 19571.75 1.267 54

4/9 6s2 ®F° n/2 19927.64 1.445 84 4/9(®H°)5d ( 7 G°)6s is

/ 2 19956.65 1.310 19 6G°

4/9 (®H°)5d ( 5 H°)6s 15/2 20166.45 1.313 43 6 H°

4/9(®H°)5d2( 3 F) n/2 20517.39 1.463 33 8p°

4/9(®H°)5d ( 5 K°)6s 17/2 20793.13 1.225 40 4 K°

4/9(®H°)5d ( 7G°)6s u/ 2 20817.16 1.44 40 8G°

4/9(®H°)5d2

( 3 F) 17

/2 20884.42 1.35 33 8 P

4/9(®H°)5d ( 5 H°)6s 4 H° 18/2 20896.37 1.33 66 4/9(®H°)5d ( 7 K°)6s 19/2 20985.62 1.29 35 8 K°

4/9(®H°)5d ( 7 I°)6s 13/2 21134-77 1.24 19 e r

4/9(®H°)5d ( 7 I°)6s 15/2 21272.07 1.21 28 6J° 4/9(®H°)5d ( 5G°)6s 6G° 18/2 21358.06 1.31 53 4/9(®H°)5d2

( 3 F) 19 /2 21464-98 1.316 36 8J°

4/9(®H°)5d2

( 3 F) 8 K

° 21

/ 2 22031.98 1.322 87 4/9(®F°)5d ( 7 G°)6s 13

/ 2 22083.31 1.402 29 ®G°

4/9 (®F°)5d ( 7 H°)6s 15

/ 2 22467.10 1.314 44 8 H°

9

/

2

22653.44 1.45

4/9(®H°)5d ( 5 I°)6s 15/2 22672.54 1.364 21 6J° 4/9 (®H°)5d ( 5 I°)6s 15/2 22854-69 1.28 26 6J°

4/9(«H°)5d2( 3 F) 18/2 22871 420 1.387 29 8 F°

4/9 (®H°)5d ( 7 K°)6s 17 /2 22908.05 1.24 31 ®K°

4/9(®F°)5d ( 7 H°)6s 8 H° 17

/ 2 22990.86 1.40 91

4/9(®H°)5d ( 5 K°)6s 15/2 23202.72 1.186 29 4 K°

4/9

( 6 H°)5d ( 5 H°)6s I 8/2 23303.06 1.31 31 ®H°

1 1/2 23561.58 1.368

4/9( 6 F°)5d ( 7 H°)6s I 8/2 23575.15 1.330 20 8 H°

4/9( 6 H°)5d2

( 3 F) l 9

/

2

23707.18 1.30 29 8 K°

4/9( 6 H°)5d2

( 3 F) 17

/ 2 23765.80 1.27 28 8 H°

4/9( 6 H°)5d ( 5 I°)6s I 8/2 24104.44 1.173 28 4 J°

4/9( 6 H°)5d ( 5 K°)6s 6 K° 17

/ 2 24316.09 1.23 45

4/9( 6 H°)5d ( 7 K°)6s I 8/2 24506.80 1.10 25 ®K°

4/9( 6 H°)5d2( 3 F) 8 L° 23

/ 2 24786.37 1.303 99

4P 5

d

2 15/2 24806.67 1.28

4/9 5d2 13

/2 24818.31 1.303

4/9( 6 H°)5d2( 3 F) I 8/2 24967.31 1.283 16 8J°
Dy II, Odd Parity—Continued

Configuration Term j

Level (cm -1

) 9 Leading

percentages

4/9( 6 F°)5d ( 7 H°)6s n/2 25036.76 1.335 36 8 H°

4/ 10

( 5 I)6p is/ 2 25192.03 1.293 22 6 H

°

4/9

( 6 H°)5d2( 3 P) 17

/ 2 2531^.42 1.255 17 8 r

4/9

( e H°)5d ( 5 I°)6s 13

/ 2 25468.58 1.15 31 6J

° n/2 25648.90 1.02 4/9

( 6 H°)5d2

( 3 F) 8 L° 21/2 2575629 1.26 57 4/9

( 6 H°)5d ( 7 G°)6s is/2 25772.86 1.37 29 8G°

4/10

( 5 I)6p 17

/ 2 25818.43 1.27 37 4 K°

4/9

( 6 F°)5d ( 7 H°)6s 15/2 25833.38 1.22 22 6 H

° n/2 26047.86 1.15 4/9

( 6 H°)5d2

( 3 P) 19

/2 26279.67 1.26 19 8J

°

n/2 26407.42 1.11 4/9

( 6 H°)5d2

( 3 P) is/2 2663420 1.290 21 8G

°

4/9 5d

2 13

/ 2 26853.72 1.320 4/9

( 6 F°)5d ( 5 H°)6s 13

/2 27193.05 1.295 15 4 H°

4/9

( 6 H°)5d2

( 3 F) 19

/ 2 27209.91 1.22 37 8 L°

4/9( 6 F°)5d ( 5 H°)6s ! 5/2 27216.93 1.30 34 6 H°

4/9( 6 H°)5d2( 3 F) 17

/ 2 27232.69 1.24 36 6 I° 4/9

( 6 H°)5d2

( 3 P) 15/ 2 27435.12 1.308 16 8 r

n/2 27462.39 1.18

9

/ 2 27476.88 1.18

18/2 27502.93 1.20

13

/ 2 27792.48 1.18 4/9

( 6 H°)5d2

( 3 F) 15

/ 2 27885.60 1.251 21 6J

° n/2 2799027 1.291 4/9 5d

2 19

/ 2 28005.87 1.32 4/9

( 6 H°)5d2

( 3 F) 13/2 28019.70 1.25 21 6G

°

4/9

( 6 H°)5d2

(

1 G) 17

/2 28252.34 1.235 15 6r

4/ 10( 5 I)6p 6 K

° 19

/ 2 28306.83 1.26 76 4/9

( 6 F°)5d ( 7 H°)6s is/2 28456.12 1.25 16 6 H°

4/9( 6 F°)5d ( 5 H°)6s 13

/ 2 28550.72 1.25 17 6 H

°

?

/ 2 28648.88 0.965

13

/ 2 28784-49 1.03 4/ 10

( 5 I)6p 15/2 28885.37 1.254 25 6 K°

11/2 2890829 1.23 4/9

( 6 H°)5d2( 3 F) 17

/ 2 29014.43 1.256 15 8 K°

4/9

( 6 H°)5d2

( 3 F) 15/2 29109.09 1.230 16 8 L°

4/ 10

( 5 I)6p e r 17

/ 2 29336.06 1.268 52

4P 5d

2 21/2 29376.94 1.26 4/ 10

( 5 I)6p 15/2 29436.60 1.222 42 4 jo

4/9

( 6 H°)5d2

( 3 F) 19

/ 2 29681.75 1.21 42 4 L°

11/2 29685.14 1.26

17/2 29765.74 1.19 4/9

( 6 H°)5d2

( 3 F) 13

/2 29769.30 1.250 16 6G

°
Dy II, Odd Parity—Continued

Configuration Term j

Level (cm -1

) 9 Leading

percentages

4/9

( 6 H°)5d2( 3 F) 13

1

2

29877.52 1.406 32

00 0

4/9( 6 H°)5d2(

l G) 15

/ 2 30112.92 1.208 30 6 P

4/ 10( 5 I)6p 1 3

/2 30287.36 1.216 18 6 H°

4/ 10( 5 I)6p 4 H° l 3/2 30361.80 1.194 53 4/9

( 6 H°)5d2( 3 F) 15/2 30399.10 1.201 23 6 H°

n/2 30553.63 1.31

17

/ 2 30580.57 1.33

13

/ 2 30638.55 1.20 n/2 3071832 1.300 4/9

( 6 F°)5d2( 3 F) 15

/ 2 3071,7.02 1.32 13 8 H°

9

/

2

30831.15 1.350

19/2 3089UM 1.32 4/9

( 6 H°)5d2

( 3 F) l 3

/ 2 30973.97 1.139 35 8 L°

4/9

( 6 H°)5d2(

1 G) 13

/ 2 31183.10 1.16 18 6J°

4/9( 6 H°)5d2( 3 F) 15/2 3130647 1.22 30 4I

°

ll/2 31313.36 1.375

11 h 31529.11 1.04 4/9

( 6 H°)5d2

(

1 G) 19

/ 2 31536.69 1.26 38 6 K

°

9

/

2

31667. i3 1.14 n/2 31701.66 1.075

13/2 31715.10 0.94 4/9

( 6 H°)5d2(

1 D) 15/2 31826.35 1.33 23 6 H°

9

/ 2 31866.89 1.28 4/ 10

( 5 I)6p 6 K° 17/2 31879.66 1.17 46 4/9

( 6 H°)5d2

( 3 P) 13/

2

31978.85 1.232 30 6G°

4/10( 5 I)6p ! 3/2 32218.141 1.157 40 6 K

°

17/2 32281.81, 1.20 n/2 32386.50 1.22

13/2 3259149 1.10 4/9

( 6 H°)5d2

( 3 F) 17/2 3261341 1.19 24 4 L°

9

/ 2 3267948 1.13 4/10

( 5 I)6p •r 15/2 32709.97 1.20 48

11

/ 2 32903.81 1.10

4/ 10

( 5 I)6p ! 3/2 3291 1,.90 1.210 37 4I

°

9

/2 32919.18 1.180

1 1/2 3300141 1.370

19/ 2 33035.57 1.232

9

/ 2 33097.32 1.093 n/2 33306.71 1.29

13

/ 2 3331941 1.18

15/2 331,65.39 1.273

11/2 3350749 1.12

4/9( 6 H°)5d2

(

1 G) 17/ 2 33529.31, 1.30 18 6 r

15/2 33576.32 1.25
Dy II, Odd Parity—Continued

Configuration Term J

Level (cm -1

) 9 Leading

percentages

i3/2 33616.81 1.259

11

/ 2 33677.88 1.137

9

/33701.13 1.076

13/2 33817.65 1.24

15

/ 2 33950.19 1.13

i3/2 34110.17 1.309 n/2 34216.48 1.132

13

/ 2 34255.72 1.272

9

/ 2 34298.38 1.14

19

/ 2 34307.62 1.233 4/9

( 6 H°)5d2

(

1 G) it/2 34396.87 1.28 24 6K°

15

/2 3442322 1.148

17

/2 34519.09 1.22

X1

/2 34524-06 1.102 H/2 34691.55 1.151

15

/ 2 3469229 1.16

9

/3471223 1.077

7

/ 3473020 1.184

13/2 34759.15 1.28

9

/34864-90 1.03

11 h 34884-43 1.272 n/ 2 35000.63 1.30

is/2 35207.83 1.132

13/2 35230.58 1.14

> 7

/ 2 35266.61 1.266 u/2 35268.41 1.20

9

/

35294.74 0.976

i5

/ 2 35365.10 1.21

7

/35387.84 0.794

13/2 35434.55 1.13

1 7

/ 2 35495.93 1.23

15/2 35565.89 1.17 H/2 35657.83 1.46

ll/2 35685.84 1.229

X5

/ 2 35707.07 1.25

9

/

35841.78 1.04

9

/ 3600125 0.96

13/2 36003.95 1.028

ll/2 36057.03 1.21

1 7

/ 2 36058.90 1.158

13/2 361 73.95 1.14

9

/

36260.74 0.953 n/2 36264.62 1.14

13/2 36282.61 1.21
290

Dy II, Odd Parity—Continued Dy 11, Odd Parity—Continued

Configuration Term J

Level (cm 1 ) 9 Configuration Term J

Level (cm -1

) 9

9

/ 2 368W-06 1.155 13

/2 38297.AA 1.20

ll

/2 36350.70 1.07 7

/ 2 38322.19 1.37

15/ 2 36377.8

A

1.347 9

/ 2 38A57.65 1.20

13

/ 2 36387.03 1.226 n/2 38A95.0A 1.131

9

/2 36A66.3U 1.08 11

/ 2 38559.A1 1.26

7

/ 2 366A3.97 1.26 7

/ 2 38583.10 1.197

7

/ 2 36699.50 1.11 3

/ 2 38599.78 1.76

15

/ 2 36719.6

A

1.23 9

/ 2 3860A25 1.26

9

/

2

36805.A3 1.225 7

/

2

38635.8

A

1.094

9

/

2

36859.32 1.37 ls

/ 2 38656.68 1.06

13

/ 2 3688A-70 1.26 5

/2 3872321 1.45

ll

/ 2 36970.68 1.20 9

/

2

38735.83 1.353

7

/

2

37036.56 0.97 13

/ 2 38758.89 1.12

18/2 37060.9

A

1.28 3

/

2

3877A-19 1.35

9

/

2

37066.56 1.20 1S/2 3880A-02 1.252

ll

/ 2 3707628 1.209 7

/

2

3881829 120

13

/ 2 37150.73 1.24 9

/

2

38972.58 1.227 u/ 2 37187.31 1.397 1 S

/2 39021.89 1.09

15

/ 2 37188.01 1.264 9

/ 2 39050.67 1.15

7

/ 2 37199.97 1.088 7

/ 2 390812

A

1.08

11 h 37363.99 1.250 “/2 39117.83 1.24

13

/ 2 37382.90 1.30 7

/ 2 3920926 1.22

11/2 37517.38 1.24 17 /2 39215.90 1.268

9

/2 37527.89 1.164 is

/ 2 3923125 1.20

15

/ 2 37623.10 1.242 13

/ 2 39293.76 1.09

11/2 37637.95 1.123 9

/ 2 39301.A5 1.153

13

/ 2 37671.30 1.320 7

/ 2 39308.62 1.021

3

/ 2 37703.36 1.53 9

/ 2 39336.52 1.17

7

/ 2 3776A-8A 1.054 5/2 39377.02 0.701 “/2 37795.70 1.208 “/2 39A1622 1.049

7

/ 2 37839.A6 0.76 7

/ 2 39A99.72 1.214

9

/2 37895.05 0.78 9

/ 2 3951 7.39 1.41

13

/ 2 37905.71 1.11 11

/

2

395A9.11 0.953

15/2 379A2.19 1.25 7

/ 2 39607.30 1.09

9

/ 2 37958.A2 1.165 9

/ 2 39691.58 1.017

ll/2 38078.02 1.097 9

/ 2 39735.10 1.43

13/2 38110.71 1.09 11

/ 2 39791.15 1.22

13

/ 2 38130.1

7

1.228 13

/2 3981A-97 1.08

li

/ 2 38156.00 1.177 9

/ 2 39838.11 1.233

5

/ 2 38162.59 1.183 “/a 3985A-90 1.19

9

/2 3821 A.89 1.22 5

/ 2 39957.A2 1.13

7 /2 3825529 1.05 n/2 39985.33 1.19

17

/ 2 38266.59 1.152 7

/ 2 A0036.03 1.101

il /2 38290.1

7

1.15 7 /2 A0060.35 1.19
291

Dy ii, Odd Parity—Continued Dy II, Odd Parity—Continued

Configuration Term J

Level

( cm

' 1 ) 9 Configuration Term J

Level

( cm

' 1

) 9

9

/2 40091.48 0.97 5

/2 4275223 1.05

5

/2 40137.54 1.32 9

/ 2 4279625 1.05 “/* 40146.37 1.07 7 /2 42831.46 1.17

5

/ 2 40209.88 0.832 3

/ 2 43048.38 1.16 “/2 40223.84 1.075 7

/ 2 43150.78 1.13

5

/2 40264-90 1.151 7 /2 43165.66 1.35

9

/ 2 40315.09 1.06 5

/2 43250.10 1.42

9

/ 2 40343.72 1.19 9

/ 2 43534.34 1.24

3/2 40454-94 1.55 5

/2 43586.31 0.99

7 /2 40477.77 1.09 7

/ 2 43668.47 1.15

3/2 40526.09 1.32 9

/

43672.95 1.17

9/2 40541.00 1.21 5 /2 43828.98 1.02 “/2 40635.58 0.96 3

/

43924.53 0.66

7 /2 40694-78 1.32 5

/2 43939.40 1.22

ll h 40945.42 1.137 u/2 44043.04 1.21

9

/ 2 40977.16 1.148 7

/ 2 44119.99 1.18

13

/ 2 41070.62 1.12 3/2 44211.30 1.16

5

/2 4126626 1.41 5

/2 44449.17 1.06

5

/2 4127420 1.41 7

/

44524-40 1.22

ll

/ 2 4130527 1.12 3

/ 2 44532.86 1.42

9

/ 2 41317.47 1.12 7

/44647.33 1.10

7

/

41335.44 1.04 5/2 44865.63 1.30

7

/

41455.39 1.10 9

/

45056.80 1.20

9/2 41472.39 1.10 3

/

45066.73 0.97

13/2 41546.61 1.20 7

/

45101.52 1.18

9

/

41547.15 1.15 9

/ 2 45138.51 1.21

9/2 4159426 1.148 5/2 45160.67 1.45

5

/2 41638.63 1.346

5

/

45210.54 1.18

7 /2 41689.34 1.382

7

/

45227.67 1.25

7

/

41 702.39 1.21

7

/ 2 45331.71 1.06

9

/41747.56 0.99

7

/ 2 4535828 1.28

7

/41808.88 1.01

5

/

45500.67 1.26

7

/41912.70 1.18 5/2 45521.69 1.08

5/2 42060.49 1.28

7 /2 45624.03 1.25

1X /2 42067.67 1.15

7

/ 2 45967.45 1.34

9

/42286.35 1.14

3

/

46010.41 1.46

5/2 42322.32 1.39

5/2 47564.56 1.44

is/2 42333.66 1.17

3

/ 2 42451.74 1.59 Dy III ( 5 Is) Limit 94100

7 /2 42628.84 1.23

5

/2 42662.83 1.46
292

Dy III

(Gd i sequence; 64 electrons) Z=66

Ground state (ls 2 2s2 2p6 3s 2 3p6 3d 10 4s2 4p64d 10 5s2 5p6

) 4/ 10 5 I 8

Ionization energy 183800± 2400 cm -1 22.8± 0.3 eV

The spectrum has not been analyzed. Hussain [1973] gives the wavelengths of more than

500 lines assigned to Dy ill, mostly in the region 2000-4450 A. Spector and Sugar have

photographed the spectrum at the National Bureau of Standards, and an analysis is planned.

The 4/ 10 5 I 8 designation for the ground level is practically certain. The lowest level from

another configuration is expected to belong to 4/ 9 5d, beginning about 17000 cm

-1 above the

ground level [Brewer, 1971; Martin, 1971; Sugar and Reader, 1973].

Sugar and Reader derived the quoted ionization energy.

References

Brewer, L., J. Opt. Soc. Am. 61, 1666 (1971). Hussain, R., Thesis, Johns Hopkins Univ., Baltimore, 142 pp. (1973); (Univ. Microfilms, Ann Arbor, Mich., No. 74- 10419). W

Martin, W. C., J. Opt. Soc. Am. 61, 1682 (1971). Sugar, J., and Reader, J., J. Chem. Phys. 59, 2083 (1973). IP

[January 1977]
293

[Dy IV]

(Eu i sequence; 63 electrons) Z=66

Ground state (ls 2 2s 2 2p fi 3s 2 3p6 3d in 4s 2 4p6 4d 10 5s 2 5pfi ) 4/ 9 6 H°5/2

Ionization energy 334000± 3000 cm -1 41.4±0.4 eV

Hussain [1973] lists about 300 of the strongest lines assigned to Dy iv on the basis of his observations of the spectra of pulsed sparks between Dy electrodes (1250-2510 A). A few of

the lines are given as classified by transitions of the types of 4/ 8 6s —4/

8 6p or 4/ 8 5c? —4/

8 6p,

but no connection between the resulting level system and the 4/ 9 ground configuration was

found; Hussain notes that measurements below 1200 A are needed. Pending a more complete

analysis, we have not included any levels obtained from the spark spectrum.

Dieke [1968] has reviewed work on the absorption and fluorescence spectra of Dy:,+ ions in crystal hosts. The 4/ 9 6 H° and fi F° levels given here are from Axe and Dieke, who derived

them from corresponding experimental sublevels of Dy:,+ in LaCl3 [Crosswhite and Dieke;

Dieke], The levels are adjusted to a value of zero for the ground level, and rounded off to the nearest 10 cm' 1

. The h H9/2 and 6 F] 1/2 levels, which are not given here, are both near 7600 cm" 1

; the Stark components of these levels overlap, and Axe and Dieke did not derive free-ion

values. No transitions to the fi F°/2 level have been observed. Dieke gives additional levels to above 26000 cm' 1

, and the levels obtained by Carnall, Fields, and Rajnak [1968] from solution

absorption spectra extend to 41700 cm' 1

. Wybourne [1962] and Carnall et al. [1968] have published the results of calculations for

Dy iv 4/ 9

. The eigenvector percentages given here are from an unpublished calculation by

Carnall et al. [1974],

Sugar and Reader [1973] obtained a value of 334500±1600 cm' 1 for the ionization energy.

We have rounded the value to three significant figures, on the low side of the former value,

based on the results obtained for Tb iv by Spector and Sugar [1976]. The estimated error has

been approximately doubled, as suggested by Spector and Sugar.

References

Axe, J. D., and Dieke, G. H., J. Chem. Phys. 37, 2364 (1962). [EL] PT

Carnall, W. T., Fields, P. R., and Rajnak, K., J. Chem. Phys. 49, 4424 (1968). [EL] [CL] [W]

Carnall, W. T., Fields, P. R., and Rajnak, K., unpublished material (1974). ND PT

Crosswhite, H. M., and Dieke, G. H., J. Chem. Phys. 35, 1535 (1961). [EL] ND [CL] [ZE]

Dieke, G. H., Spectra and Energy Levels of Rare Earth Ions in Crystals, Ed. H. M. Crosswhite and H. Crosswhite, pp. 268-279 (Interscience Publishers, New York, 1968). [EL] ND [CL] [W] [ZE]

Hussain, R., Thesis, Johns Hopkins Univ., Baltimore, 142 pp. (1973); (Univ. Microfilms, Ann Arbor, Mich., No. 74-

10419). EL CL W PT

Spector, N., and Sugar, J., J. Opt. Soc. Am. 66, 436 (1976). Sugar, J., and Reader, J., J. Chem. Phys. 59, 2083 (1973). IP Wybourne, B. G., J. Chem. Phys. 36, 2301 (1962). PT

[July 1976]
[Dy IV]

Configuration Term J

Level (cm -1

) Leading percentages

4/9 6 H° 15/ 2 0 94 5

4 I°3

i3/ 2 [5460] 96 2

4 I°3 “/2 1 5780] 92 3

6F

°

9

/ 2 93 3

4G°4

7

/ 2 [9060] 93 4

4G°4

5

/ 2 [2 Of 00] 92 5

4G°4

4/9 6 F° ii/2 93 3

6 H°

9

/2 [5950] 88 7

4F°3

7

/2 [20570] 92 4

3F°3

5 /2 [22270] 93 24 F°3

3 /2 [25060] 90 34D°2

V2 91 4

4 D°2

Dy V ( 7 Fe) Limit 334000
Dy XXXIX

(Ni I sequence; 28 electrons) Z=66

Ground state (ls 2 2s 2 2pfi 3s 2 3p6

) 3c?

10 'S„

Burkhalter, Nagel, and Whitlock excited the spectrum of this ion in the 5-15 A region by

focusing light from a pulsed laser onto a Dy target. Using isoelectronic regularities and

comparisons with calculated energies, they were able to classify the 3c?

10 'S0 —3dfl 4p(J=l) and

3d 10 'S,, —3d s 4/(J=l) transitions. We have converted the levels from units of eV to units of 104 cm' 1 (equivalent to 1.23985 eV).

The coupling in the excited configurations should be very similar in Gd XXXVII and

Dy xxxix ; leading eigenvector percentages have been calculated for the Gd case (see

Gd xxxvii).

Reference

Burkhalter, P. G., Nagel, D. J., and Whitlock, R. R., Phys. Rev. A 9, 2331 (1974). EL CL f

[July 1976]

Dy XXXIX

Configuration Term J

Level

(10 4 cm-1

)

3d'° X S 0 0.0

3d9

( 2 D3/2)4pi/2 ( 3 /2//2)° 1 1004

3d9

( 2 D5/2)4p3/2 ( 5/2,3/ 2

)° 1 1019

3d9

(2 D3/2)4p3/2 ( 3

/ 2,3

/ 2

)° 1 1049

3d9

( 2 Ds/2)4/5/2 ( 5

/2,5/2)° 1 1207?

3d9

( 2 D5/ 2 )4/7/2 ( 5/2,

7

/2

)° 1 124.7

3d9

( 2 D3/2)4/5/2 (3

/2,5/ 2

)° 1 1278
HOLMIUM

Ho I

67 electrons Z=67

Ground state (ls 2 2s2 2p6 3s 2 3p6 3d 10 4s 2 4p6 4d 10 5s2 5p6

) 4/ u

6s 2 4 I°5/2

Ionization energy 48567± 5 cm" 1 6.02 16± 0.0006 eV

Identified odd configurations 4/ u

6s 2

, 4/ 10 6s2 6p, 4/ u 5d6s, 4/ 10 5c?6s6p, 4/ n

6s7s

Identified even configurations 4/ 10 5d6s 2

, 4/ 10 5d2 6s, 4/ n

6s6p, 4/ u 6s7p

Levels, Ionization Energy, Wavelength Observations

Extensive data on the level structure of most neutral rare-earth atoms had been obtained

before the analysis of Ho I by Blaise, Camus, Guelachvili, Verges, and Wyart [1972a, 1972b].

The remarkable achievement of these authors in identifying at least six of the above

configurations very early in the analysis of this complex spectrum was no doubt aided by the

available data from other spectra. The levels, identifications, and eigenvector percentages

given here are from unpublished material communicated by Wyart [1975, 1976]; many new

data from the continuing analysis are included, as well as some revised level values. Wyart

[1976] notes that 20 of the even levels originally based on absorption lines [Blaise et al., 1972a]

have been definitely confirmed by additional emission transitions. These levels are included

here.

Worden, Conway, Paisner, and Solarz [1977] have observed high members of two series in Ho i by using laser techniques. These data became available too late for inclusion here, but the

quoted ionization energy is a new determination from these series. Meggers, Corliss, and Scribner list about 950 lines assigned to either Ho I or Ho n (2502-

8916 A), with Ho I classifications from the earlier lists of energy levels [Blaise et al., 1972a;

1972b]. Spector’s [1977] list of 460 Ho lines in the near infrared (0.759-1.2 p.m) also has

spectrum assignments to Ho I or Ho n. Unpublished infrared spectra obtained at Orsay (0.8-

4.2 p,m) have yielded many resolved hyperfine structures [Camus, Verges, and Wyart, 1975].

The absorption spectrum was photographed at Argonne over the range 2400-4000 A

[unpublished data mentioned by Blaise et al., 1972a].

g Values

The g value for the ground level is from the atomic-beam magnetic-resonance data of

Haberstroh, Moran, and Penselin [1972], rounded off to five places. Dankwort and Ferch [1974]

have reevaluated these measurements to obtain a value of 1.1951429±0.0000025. The original

determinations of the g and J values of this level were consistent with the 4/ u

6s 2 4 I°5/2 designation [Childs and Goodman, 1961; Cabezas, Lindgren, and Marrus, 1961; Goodman,

Kopfermann, and Schliipmann, 1962]. Livingston and Pinnington [1971] tentatively classified a

transition to the ground level on the basis of their optical Zeeman-effect data. We have listed g values for two other levels of the ground term and for six upper levels, as derived from

these data and the known levels. More recent observations of the Zeeman effect by Camus

and Fred at Argonne have not been published.
Ho I —Continued 297

Interpretation of Even Levels

Some levels of the low even configurations 4/ 10 5d6s2 and 4/ n 6s6p are designated in the

J x j and J X J2 coupling schemes, respectively [Blaise et al., 1972a; 1972b; Wyart, 1973; 1975;

1976]. No eigenvector percentages are given in these schemes, but leading percentages in LS

coupling from Wyart’s [1975] calculation of (4/ 10 5d6s2 +4/"6s6p) are listed for most of these

levels. No LS percentages from 4/ u

(

4 I°)6s6p quartet terms are given, since Wyart did not use

the 6s6p( 3 P°,'P°) parentage scheme in his calculation. In some cases, total percentages from

one or both configurations are given instead of term percentages. The Jjj-coupling

percentages given by Wyart [1973] for the lower 4/ 10 5d6s2 levels are not listed because the

earlier calculation did not include interaction with 4/ u6s6p.

Wyart [1975] calculated the 4/ 10

( 5 I)5d2 6s group of levels separately, with matrices

truncated to include only this subconfiguration. The twelve known levels of 4/ n 6s7p are arranged into four complete 4/ u

6s(J 1 )7pO') terms, built on the lowest two levels of Ho II (/,=

8J) [Wyart, 1975], We list the two J x parent levels as belonging to the 4/ u

(

4 I°5/2 )6s { xhk, lk )| 7 ground term of Ho II, in accordance with the coupling in this parent configuration (see Ho n).

Interpretation of Odd Levels

Aside from the 4/ u

6s 2 ground configuration, the most important configurations in accounting for the known odd levels are 4/ 10 6s 2 6p, 4/ 10 5d6s6p, and 4/ n

5d6s. The eigenvector

percentages are from Wyart’s [1976] calculation of (4/

10 6s 2 6p+4/ u 5c?6s); no detailed

interpretation of the 4/ 10 5d6s6p levels has yet been made. A calculation including the

interactions between all three configurations may be needed. The 4/ 10 6s2 6p levels are designated in J x j coupling [Blaise et al., 1972b; Spector, 1974; Wyart, 1976], with the leading

percentages in LS coupling listed after the word “or.”

References

Belyanin, V. B., Opt. Spektrosk. 3, 322 (1957). Hfs

Blaise, J., Camus, P., Guelachvili, G., Verges, J., and Wyart, J. F., C. R. Acad. Sci. Ser. B 274, 1302 (1972a). EL PT

Blaise, J., Camus, P., Guelachvili, G., Verges, J., and Wyart, J. F., C. R. Acad. Sci. Ser. B 275, 81 (1972b). EL ND PT

Cabezas, A. Y., Lindgren, I., and Marrus, R., Phys. Rev. 122, 1796 (1961). ZE Hfs Camus, P., Verges, J., and Wyart, J. F., unpublished material (1975). CL W Hfs

Childs, W. J., and Goodman, L. S., Phys. Rev. 122, 591 (1961). ZE

Dankwort, W., and Ferch, J., Z. Phys. 267, 239 (1974). ZE Hfs Goodman, L. S., Kopfermann, H., and Schliipmann, K., Naturwiss. 49, 101 (1962). Hfs and J value Goodman, L. S., and Schliipmann, K., Z. Phys. 178, 235 (1964). ZE Hfs

Haberstroh, R. A., Moran, T. I., and Penselin, S., Z. Phys. 252, 421 (1972). ZE Hfs

King, A. S., Astrophys. J. 72, 221 (1930). W

Livingston, A. E., Jr., and Pinnington, E. H., J. Opt. Soc. Am. 61, 1429 (1971). ZE

Meggers, W. F., Corliss, C. H., and Scribner, B. F., Tables of Spectral-Line Intensities, Nat. Bur. Stand. (U.S.), Mono.

145, Part I, 403 pp. (1975). CL W

Spector, N., Phys. Scr. 9, 313 (1974). ND

Spector, N., Astrophys. J. 211, 600 (1977). W

Worden, E. F., Conway, J. G., Paisner, J. A., and Solarz, R. W., unpublished material (1977). IP

Wyart, J. F., Thesis, Univ. Paris-Sud, Orsay, 194 pp. (1973). PT

Wyart, J. F., unpublished material (1975, 1976). EL ND PT

[October 1976]

225-298 O - 78 - 20
298

Ho I, Odd Parity

Configuration Term J

Level (cm ’) 9 Leading percentages

4/

11 6s

2 4 I° 15

/ 2 0.00 1.19514 97 3

2 K°

13

/ 2 5U19.70 99 l 2 K

° u/2 8605.16 1.012 86 12 2 H°2

9

/2 10695.75 0.866 61 16 2 H°2

4/ 10( 5 l8)6s2 6pi/2 ( 8.V2)

0 15/2 1857228 or 57 (5J) 6 H

°

17/2 18737.79 or 42 (51) 6I

<>

4/11( 4 I°)5d6s(3 D) 6 G° is/ 2 1886740 82 13 ( 4 I°)( 3 D) 6 H°

4/ 11

( 4 I°)5d6s( 3 D) 6 H“ 15/2 19276.94 82 11 ( 4 D(3 D) 6 I° 4/11

(4 I°)5d6s(3D) xl/ 2 20060.76 37 4G° 30 ( 4 I°)( 3 D) 6G°

4/ 11( 4 I°)5d6s(3 D) 19/2 2012425 37 6 L° 31 ( 4 I°)( 3D) 4 L° 4/11

( 4 I°)5d6s( 3 D) 6 L

° 21 /2 20210.60 97 3 ( 2 K°)(3 D) 4 M°

4/11( 4 I°)5d6s( 3 D) 17

/ 2 20315.89 25 4 L° 23 ( 4 I°)(3 D) 6 K°

4/11( 4 I°)5d6s(3 D) 13

/ 2 20493.77 35 4 H° 23 ( 4 I°)(3 D) 6 H°

4/ll( 4 I°)5d6s( 3 D) 17/2 20613.81 34 6 F 27 ( 4 I°)(3 D) 2 L°

4/ 11

( 4 I°)5d6s(3 D) G K° 19/2 20831.18 60 31 ( 4 I°)(3 D) 4 L° 4/11

( 4 I°)5d6s(3 D) 15/2 2106922 27 4 K° 18 ( 4 I°)(3 D) 2 K°

4/ 10( 5 Is)6s2 6p3/2 (8

,

3

/ 2

)° 17

/ 2 21378.54 or 38 (51) 6I

o

19/2 21485.02 or 91 (51) e K

°

15/2 21682.90 or 48 (51) 4 F

l 3

/

2

2202420 or 52 (51) 4 H

°

4/ 11

( 4 I°)5d6s(3 D) 17 /2 21552.02 34 4 K° 28 ( 4 i°x3 D) e r

4/ 11( 4 P)5d6s(3 D) 1S/2 22014.13 30 4JO 27 ( 4 I°)(3 D) 2 K°

4/ 11( 4 I°)5d6s( 3 D) 9

/ 2 22157.88 36 4G° 31 ( 4 I°)(3 D) 2 G°

4/11( 4 I°)5d6s(3 D) 13

/2 22392.88 36 2 JO 25 (4 P)(3 D) 4 I° 4/ 11

( 4 I°)5d6s(3D) 71 /2 22518.59 28 2 H° 28 ( 4 I°)(3 D) 4 H°

4/n( 4 G°)6s2 4 G° 11

/ 2 22593.53 55 32 2 H°2

4/11( 4 I°)5d6s( 1 D) 13/ 2 23585.31 38 4 H° 15 4/ 10

( 5 I)6s2 6p

6 H°

4/

10

( 5

l 7 ) 6s

2 6pi« (7,V2)° 15

/2 23818.54 or 31 (51) 6 R

o

1 S

/2 23942.71 or 26 (51) 4 H

°

4/11( 4 I°)5d6s( 1 D) 4 K° 17

/2 23885.74 89 6 PDC'D) 4 L°

4/ 10( 5 I)5d6s6p 15/2 24112.04 4/10

( 5 I)5d6s6p 17 /2 24115.17 4/ 11

( 4 I°)5d6s( 1 D) 4J° 15/2 24357.90 80 10 ( 4

I°)( 1 D) 4 K°

4/10

( 5 I)5d6s6p 18/2 24594.75 4/ 10

( 5 I)5d6s6p 19/2 2467825

4/11(4 I°)5d6s(3D) 15/2 25591.43 37 4 L° 37 ( 4

I °)( 3 D) 6 L

°

4/11( 4 I°)5d6s( 3 D) H/2 25616.46 44 4G° 17 ( 4 I°)(3 D) 6G°

4/11

( 4 I°)5d6s(3 D) 6 L° 17

/ 2 25660.40 58 21 ( 4 I°)(3 D) 2 L°

4/ n( 4 I°)5cZ6s(3 D) 9

/ 2 25805.04 34 2G° 33 ( 4 I°)(3 D) 6G°

4/10( 5 I)5d6s6p 2 1/2 25980.35

4/ 10( s I)5d6s6p 15/2 26023.52

4/ 10( 5 I)5c£6s6p x3

/ 2 2612722

4/ 10( 5 I)5d6s6p 17/2 26143.57

4/11

( 4 I°)5d6s(3D) 15/2 26198.39 37 S K° 28 (4I°)(3 D) 4 I°

4/11( 4 I°)5d6s(3 D) x3

/ 2 26225.76 24 6 K° 17 ( 4 I°)(3 D) 4 H°

4/ 11( 4 F)5d6s(3 D) 13/2 26288.10 26 4H° 16 ( 4 I°)( 3 D) 6 H°
299

Configuration

4/11

(4 I°)5d6s(3D)

4/

10

( 5 l 7 ) 6s

2 6p3/2

4/11

( 4 I°)5d6s(3 D)

4/ 10

( 5 I)5d6s6p

4/ , 0( 5 I)5d6s6p

4/ 10( 5 I)5d6s6p

4/11( 4 I°)5d6s(3 D)

4/11( 4 I°)5d6s(3 D)

4/ 11( 4 I°)5d6s(3 D)

4/10

( 5 I)5d6s6p?

4/ 10

( 5 l6)6s2 6pi/2

4/ 10

( 5 I)5d6s6p?

4/10

( 5 I)5d6s6p?

4/ 10( 5 I)5d6s6p?

4/10

( 5 I)5d6s6p?

4/ 10

( 5 I)5d6s6p?

4/ 10

( 5 I)5d6s6p?

4/ 10

( 5 I)5d6s6p?

4/ 10( 5 I)5d6s6p?

4/ 10

( 5 I)5d6s6p?

4/10

( 5 I)5d6s6p?

4/ 11( 4 I°)5d6s( 1 D)

4/10( 5 I)5d6s6p?

4/ 10

( 5 I)5d6s6p?

4/10

( 5 I)5d6s6p?

4/ 10

( 5 I)5d6s6p?

4/ 10

( 5 I)5d6s6p?

4/10

( 5 I)5d6s6p?

4/ 10

( 5 I)5d6s6p?

Ho I, Odd Parity—Continued

Term

I J

Level (cm' 1

) 9 Leading percentages

u/2 26AJt3.ll 32 2 H° 30 ( 4 D(3 D) 6 H°

(7 3

/ 2

)° i 5/2 26456.72 or 43 ( 51 ) 6I

°

i 7/2 26637.82 or 60 ( 51 ) 6 K

° n/2 2666A.67 or 43 ( 51 ) 6 H

°

18/2 26673.72 or 37 ( 51 ) 6 H

°

17/2 26480.47 39 6K° 19 ( 4 I°)(8D) 4 K° n/ 2 26529.83

19/2 26770.17

15/2 26811.32

15

/ 2 26922.41 42 6 r 14 ( 4 P)(3 D) 2 K°

is

/2 26977.37 41 e r 14 ( 4 I°)(3 D) 4 K°

11/2 27049.80 25 4 J° 16 ( 4

I°)(3 D) 6I°

21/2 27358.81

( 6,V2)° 18/2 27423.79 or 40 ( 51 ) 6 K

°

1X /2 27643.13 or 73 ( 51 ) 4 R

°

19/2 2747027

15/2 27649.51

19/2 27670.98

23

/ 2 27697.56

18/2 27724-36

17/2 27923.18 •

17 /2 2824429

17/2 28315.79

19

/ 2 2839324

21

/ 2 2848124

15/2 28561.18

4 L° 17/2 28861.41 91 6 cdod) 4 k°

21/2 28887.78

15/2 29086.67

28/2 29266.91

17/2 29443.09

19/2 29465.60

21/2 29558.07

8 M°? 25/2 29576.42

19/2 29692.67

1S /2 29834-05

15 /2 29979.51

28/2 30011.00
300

Ho I, Odd Parity—Continued

Configuration Term J

Level (cm' 1

) 9 Leading percentages

4/ 10( 5 l6)6s2 6p3/2 (6,

3

/ 2

)° 13/2 30029.36 or 39 ( 5 I) 6 I°

11

/ 2 30146.15 or 47 ( 5

I) 4 I°

15/2 9

/2

15

/ 2 30049.10 4/ 10

( 5 I)5d6s6p? 17

/ 2 30135.31 4/ 10

( 5 I)5d6s6p? 17 /a 30327.49

lS/2 30338.72

4/ 10( 5 I)5d6s6p? !9/2 30425.58 4/ 10

( 5 I)5d6s6p? 21/2 30484-68 4/10

( 5 I)5d6s6p? 17

/2 30582.15

15

/ 2 30773.59 4/ 10

( 5 I)5d6s6p? 17

/2 30805.90

4/ 10( 5 I)5d6s6p? 19 /2 31018.63

15

/ 2 31042.44

4/ 11( 4 Ii5/2 )6s7s(3 Si) ( 15

/ 2 ,1)° 17

/ 2 3111622

15/ 2 3144326

13

/ 2 3181626

4/ 10( 5 I)5d6s6p? 23

/ 2 31515.70

15/2 31540.19

4/10( 5 I)5d6s6p? 17

/ 2 31 793.06

15/2 32671.45

4/11

( 4 Ii5/2)6s7s( 1 So) ( 15

/ 2 ,0)° 15/2 33005.31

15/2 33091.50

18/ 2 34653.56

4/ n( 4 Ii3/2)6s7s(3 Si) ( 13 /2,1)° 15

/2 3673123

13/2 36873.76

1X /2 37029.70

15/2 37623.09

4/11

( 4 Ii3/2 )6s7s( 1 So) ( 13

/ 2 ,0)° 13/2 38397.18

HO II ( 4 Il5/2>6s ( 15

/ 2,

1 / 2 )8 Limit 48567

L
301

Ho I, Even Parity

Configuration Term J

Level

( cm -1

) 9 Leading percentages

4/10

( 5

I 8)5d3/2 6s2 (8,

3

/2 ) 17/ 2 8378.91 or 73 ( 5

I) 6I 15/2 8427.11 or 53 ( 5 I) 6 H

1S/2 9147.08 or 67 ( 5 I) 6G

19/2 9741.50 or 66 ( 5 I) 6 K

4/ 10

( 5 l8)5ds/2 6s2 (8

5

/ 2 ) 21 /2 11322.31 or 93 ( 5 I) 6 L

17

/2 11530.56 or 52 ( 5 I) 4 K

19

/ 2 11689.77 or 56 ( 5 I) 4 L

15

/ 2 12339.04 or 35 ( 5 I) 6 H

n/2 16937.43 or 49 ( 5 I) 4 G

4/ 10( 5

I 7 )5d3/2 6s2 (7,

3

/ 2 ) 13

/ 2 12344.55 or 27 ( 5 I) 6

I n/2 13082.93 or 51 ( 5 I) 6G

17 /2 15130.31 or 33 ( 5

I) 6 L

15/2 15136.06 or 53 ( 5 I) 4

I

4/10( 5 I)5d6s2 l 3

/2 15081.12 46 ( 5 I) 4 H

4/ 10

( 5 I)5d6s2 ll/2 15792.13 36 ( 5 I) 6

I

4/ 11( 4 Ii5/2 )6s6p(3P8) ( 15

/ 2 , 0) 15/2 15855.28 or 38 (4I

0 )(3P°) 6 H

4/ 10 5d6s2 15/2 16154.21 62 38 4/ 11 6s6p

4/ 10

( 5 l7)5d5/2 6s2 (7,

5

/ 2)

1 7

/ 2 16438.01 or 38 ( 5 I) 6 K

4/ 10

( 5

I 7 )5d5/2 6s2 (7

5

/ 2 ) 19/2 16683.52 or 69 ( 5 I) e L

4/11( 4 Ii5/2 )6s6p(3P!) ( 15/2,1) 17 /2 16709.82 or 42 ( 4 I°)( 3P°) 61

1S /2 16882.28 or 33 (4

I °)(3P°) 2K

l 3

/2 17059.35 30 4/ 10 5d6s2

4/ 10( 5

I 6 )5d3/2 6s2 (6,3

/ 2) 9

/2 16719.62 or- 41 ( 5 I) 6G

4/ 10 5d6s2 13/2 16735.95 70 30 4/ 11 6s6p

4/ n( 4 K5/2 )6s6p(3PS) ( 15

/ 2 ,2) 19/2 17883.57 or 97 ( 4I

°

) (3P°) 6K

17

/ 2 18337.80 or 50 ( 4 I°)( 3P°) 8

I 15

/2 18651.53 n/2 18821.25 or 41 ( 4

I

°)

( 3p

0

) 2 H

13/2 18858.19 or 37 ( 4 r)(3P°) 2]

4/10 5d6s2 n/2 18491.21 85 15 4/ 11 6s6p

4/ 10

( 5 Ie)5d3/2 6s2 (6,

3

/ 2 ) 13/2 18564.90 or 44 ( 5 I) 6 K

4/ 10( 5

I6 )5d3/2 6s2 (6,

3

/ 2 ) 15/2 18756.22 1.03 or 55 ( 5 I) 6 L

4/ 10

( s I)5d6s2 9

/2 18757.87 47 ( 5 I) 6

I

4/ 10( 5 Is)5d5/2 6s2 (6,

5

/ 2) 15/2 20074.89 or 35 ( 5 I) 6 K

4/10

( 5 I)5d2( 3 F) ( 7G)6s 8G 15/2 20167.17 58 32 ( 5 I)(3 F) ( 7 H) 8 H

4/10

( 5 Ie)5d5/2 6s2 (6,

5

/ 2 ) 13/

20241.31 or 42 ( 5 I) 4

I

4/ ,0

( 5 I)5d2

( 3 F) ( 7 F)6s 8 F 13

/

a 20258.27 57 31 ( 5

I)( 3 F) ( 7 G) 8G

4/ 10

( 5 I)5d6s2 14 /2 20493.40 55 ( 5 I) 6 K

4/10

( 5 I)5d2( 3 F) ( 7 H)6s 8 H 11/2 20498.73 60 29 ( 5

I)( 3 F) ( 7 I) 8

I

4/‘° 5d6s2 11 h 20849.13 96 4 4/ 11 6s6p

4/ 10

( 5

I 5 )5d3/2 6s2 (5,

3

/2 ) 13/2 21044.81 or 66 ( 5 I) 6 L

4/ 10

( 5 I)5d2

( 3 F) ( 7 I)6s 8

I 19/2 21217.11 54 33 ( 5 I)(3 F) ( 7 K) 8 K

4/ IO

( 5 I)5d6s2 9

/21373.17 62 ( 5 I) 4 G
302

Ho I, Even Parity—Continued

Level

Configuration Term J (cm -1

) 9 Leading percentages

4/ 10( 5 I)5d2

( 3 F) ( 7 K)6s 8 K 21 /2 21494.89 56 34 ( 5

I)(3 F) ( 7 L) 8 L

4/11( 4 Ii3/2 )6s6p(3Po) ( 13/2,0)

13 /2 21584.89

4/ 10

( 5 I)5d2

( 3 F) ( 7 L)6s 8 L

23

/ 2 21980.67 84 14 ( 5 I)(3 F) ( 7M) 8 M

4/1 l( 4 Ii3/2 )6s6p(3Pi) ( 13

/ 2,1) 13/2 22157.86

(4 r)(3P°) 1S

/ 2 22227.34 or 43 6 K

n/2 22413.14

4/ 10

( 5 I)5d2( 3 F) ( 7 F)6s 13 /2 22414.04 24 8 F 20 ( 5 I)(3 F) ( 7 H) 8 H

4/ 10

( 5 I)5d2

( 3 F) ( 7 K)6s 17 /2 22476.89 22 8 K 18 ( 5 I)(3 F) ( 7 H) 8 H

4/ 10( 5 I)5d2

( 3 F) ( 7G)6s 15

/ 2 22500.62 21 8G 20 ( 5 I)(3 F) ( 7 I) 8

I

4/10

( 5 I)5d2( 3 F) ( 7 I)6s 19/2 22866.55 25 8

I 20 ( 5

I)(3 F) ( 7 L) 8 L

4/10( 5 l5)5d5,2 6s2 (5,

5

/ 2 ) 13/2 22978.19 or 41 ( 5

I) 4 K

4/ 10( 5 I)5d2

( 3 F) ( 7 K)6s 21/2 23366.71 27 8 K 17 ( 5 I)(3 F) ( 5 L) 6 L

4/10( 5 I)5d2( 3 F) ( 7 M)6s 8 M 25/2 23375.28 100

4/ 10

( 5

I 5 )5d5/2 6s2 (5,

5

/ 2 ) ll/2 23379.31 or 24 ( 5 I) 4

I

4/10( 5 l5)5ds/2 6s2 (5,

5

/ 2 ) 15/2 23445.28 1.012 or 59 ( 5 I) 4 L

4/11( 4 Ii3/2)6s6p(3 P§) ( 13 /2,2) 11/2 23498.57 or 59 ( 4

1

° )(3 p

0

) 6 K

1S /2 23834.94 or 43 (4I°)(3P°) 6

I 9

/

2

23861.17

ll h 23946.16

l 3

/

2

7

/

2

23955.69 14 4/ 10 5d6s2

4/ 10( 5 I)5d2

( 3 F) ( 7 M)6s 23

/ 2 24006.23 41 8M 37 ( 5

I)(3 F) ( 5 M) 6M

4/11( 4 Ii5/2 )6s6p( 1 Pi) ( 1S /2,1) 18/ 2 24014.22

( 4 I°)( ) l7 /2 24360.81 or

4 K

15/2 24660.80 or ( 4 I°)( ) 4

I

4

f

10 5d6s2 71 /2 24141.21 95 5 4/11 6s6p

4/10( 5 I)5d2

( 3 P) ( 7 H)6s l 7 /2 24263.96 27 8 H 14 ( S I)(3 F) ( 7 I) 8

I

4/10 5d6s2 9

/2 24355.64 96 4 4/ 11 6s6p

4/10( 5 I)5d2

( 3 F) ( 7 H)6s 15 12 24376.91 16 8 H 10 ( 5 I)(3 F) ( 5 K) 6 K

4/10( 5 I)5d2

( 3 F) ( 5 M)6s 19/2 24404.19 12 6M 11 ( 5 I)(3 F) ( 7 K) 8 K

4/10( 5 I)5d2

( 3 F) ( 5 M)6s 21/2 24714.34 24 gM 14 ( 5 I)(3 F) ( 3M) 4 M

4/10 5d6s2 13 /2 24740.52 82 18 4/11 6s6p

4/10( s I)5d2( 3 F) ( 7G)6s 18/2 24760.13 18 8G 10 ( 5 I)(3 F) ( 7 I) 8

I

4/ 10( 5 I)5d2

( 3P) ( 7 H)6s 8 H l 7

/

2

24795.58 64 6 ( 5I)( 3 F) ( 7 H) 8 H

4/10 5d6s2 “/2 25261.55 0.90 63 37 4/ 11 6s6p

4/10 5d6s2 15/2 25272.63 76 ( 5F) 6 H

4/ 10

( 5 I)5d2( 3 P) ( 7 K)6s 8 K *1/2 25545.07 86 6 (“IX^) ( 5 L) 6 L

4/ 10( 5 I)5d2

( 3 F) ( 3 M)6s l9/2 25548.26 22 2M 11 ( 5

I)(3 F) ( 5 L) 6 L

4/ 10( 5 l4)5d5/2 6s2 (4

,

5 M 13/2 25930.66 or 75 ( 5 I) 4 L

4/ 10( 5 I)5d2( 3 F) ( 7 H)6s 15/2 25967.69 35 6H 11 ( 5 I)(3 F) ( 7 I) 6

I
303

Ho I, Even Parity—Continued

Configuration Term J

Level (cm -1

) 9 Leading percentages

4/ 10 5d6s2 9

/2 26039.99 88 12 4/ 11 6s6p

4/ 10( 5 I)5<i2

( 3 F) ( 7 I)6s 17/ 2 26655.52 43 6

I 21 ( 5

I)( 3 F) ( 7 K) e K

4/ 11( 4 Iii/2)6s6p( 3P5) ( ll /2,2) is/2 26957.70

4/ 11( 4 Ii3/2 )6s6p( 1 Pi) ( 13 /2,1) n/2 29069.78

is/2 29642.60

13 /2 29751.91

4/ 10 5d6s2 9

/2 32039.76 1.267 20 ( 5G) 6d

9

/2 32784.83

4f'°5d6s2 41 /2 34366.07 1.104 64 36 4/ 11 6s6p

9

/2 35040.75 1.139

4/ 11( 4 Il5/2)6s ( 15/ 2 , 1 / 2 )s 7pi/2 (8,Vs) lS/2 36344.52

17/2 36367.65

4/ 11

( 4 Il5/2)6s ( 15/2,

1 / 2 )7 7pi/2 (7,02) 13/ 2 36663.94

15 /2 36860.75

4/ S1( 4 Il5/2)6s ( 15/ 2 , 1/ 2 )s 7p3/2 (8,

3 h) 19/ 2 36726.65

17/2 36791.24

13/ 2 36895.69

15/2 36958.59

4/ ll

( 4 Il5/2)6s ( 15/2,

l /2)7 7p3/2 (7,3

/ 2 ) 15/2 37324.64

17/2 37388.72

13/2 37404.27 “/

37438.53

17/2 37356.81

15/2, 13

/

37404.14

15

/2, 13/ 2 37481.94

15/2 37651.71

15/2j 13

/ 2 37865.77

15

/2,13/2 38244.65

*3/2 38513.79

13

/ 2 38828.16

15

/2, 13/ 2 39098.76

15

/2, 13

/ 2 39171.93
304

Ho I, Even Parity—Continued

Configuration Term J

Level (cm -1

) 9 Leading percentages

13/2 39554.49

15/2 39676.57

1S

/ 2 39904.45

HO II ( 4 I?5/2)6S ( 1S /2,V2)8 Limit U8567
Ho II

(Dy i sequence; 66 electrons) Z=67

Ground state (ls 2 2s 2 2p6 3s 2 3p6 3d 10 4s 2 4pfi 4d 10 5s2 5p6

) 4/ u(

4 I°5/ 2 )6s ( 15

/ 2 ,V2

)‘’8

Ionization energy 95200± 600 cm 1 11.80± 0.08 eV

Sugar and Spector identified the ground-term pair of levels in Ho ii by classifying

“several pairs of lines originating from common upper levels and terminating on the two

lowest levels of the 4/ “6s configuration...” [Sugar, 1968]. Only two upper even levels were

listed in connection with Sugar’s study of the hyperfine structure, but Livingston and

Pinnington [1971] gave eight additional upper levels and the corresponding pairs of lines. The

identification of the excited configurations was begun by Wyart, Blaise, and Camus [1974], who

designated several 4/ n

(

4 I°5/2 )5d and 4/ n

(

4 I°5/2 )6p levels that classified a group of infrared

lines. Wyart found the three upper pairs of levels that complete the 4/ u

(

4 I°)6s

subconfiguration, as well as additional 4/"(4 I°)5c? and 4/ n

( 4 I°)6p levels [Wyart, Root, and van

Kleef, 1974; Wyart, 1975; 1976], The term designations for all three configurations are in J x j

coupling schemes. Spector [1976] gave several new levels to extend the 4/ n

( 4 I°)5d and

4/ u(

4 I°)6p structures. The analysis is still at an early stage. Although the Zeeman effect for this spectrum is complicated by hyperfine structure, Wyart has made use of some Zeeman data in his analysis.

The levels and interpretation as given here include several additions and corrections by Wyart

[1975, 1976]. The hyperfine widths of some of the even levels indicate large contributions from

the 4/ 10 5d6s configuration [Livingston and Pinnington; Wyart, Blaise, and Camus], which is expected to begin below 12000 cm

-1

. A satisfactory analysis will probably require the

calculation of the (4/ u 6p+4/ 10 (5c?+6s) 2

) group [Wyart, Root, and van Rleef], The leading

percentages listed for some of the even levels are from a calculation of the 4/ n 6p

configuration alone [Wyart, Root, and van Rleef]. Some of these levels are known to be

perturbed, and two of the 4/ 11 (

4 I°5/2 )6p3/2 assignments are given specifically as uncertain

(asterisks after levels) [Wyart, 1976],

Sugar gave eigenvectors for the ground-term pair of levels in the Jx j coupling scheme. No

percentages in this scheme are available for the other 4/ u

(

4 I°)6s and 4/ u

( 4 I°)5c( even levels. The leading percentages for these levels in the LS scheme (given after the word “or”) are from eigenvectors calculated by Wyart [1975].

Several of the published lists of Ho lines are noted in the text for Ho I. More complete

lists for Ho i and Ho II based on recent observations are not yet available. Wyart is using

measurements from spectrograms obtained at Argonne and, for the infrared region, Fouriertransform spectra observed by Verges at Orsay. Spector [1977] prepared a list of Ho lines for

the infrared region 0.759-1.2 p,m. His 1976 paper gives 40 classified Ho ii lines, mostly in this region.

Sugar and Reader derived the ionization energy.

King, A. S., Astrophys. J. 72, 221 (1930). W

Livingston, A. E., Jr., and Pinnington, E. H., J. Opt. Soc. Am. 61, 1429 (1971). EL CL Hfs

Meggers, W. F., Corliss, C. H., and Scribner, B. F., Tables of Spectral-Line Intensities, Nat. Bur. Stand. (U.S.), Monogr.

145, Part I, 403 pp. (1975). CL W

Spector, N, Phys. Ser. 13, 181 (1976). EL ND CL W PT

Spector, N., Astrophys. J. 211, 600 (1977). W

Sugar, J., and Reader, J., J. Opt. Soc. Am. 55, 1286 (1965). IP

Sugar, J., J. Opt. Soc. Am. 58, 1519 (1968). EL CL Hfs PT

Wyart, J. F., unpublished material (1975, 1976). EL ND PT

Wyart, J. F., Blaise, J., and Camus, P., Phys. Scr. 9, 322 (1974). EL ND CL W

Wyart, J. F., Koot, J. J. A., and van Kleef, T. A. M., Physica (Utrecht) 77, 159 (1974). EL PT

References

[October 1976]
Ho II

Configuration Term J

Level (cm ’) Leading percentages

if U( 4 Il5/2)6Sl/2 ( 15/2,V2)° 8 0.00 97 or 97 5

I° 7 63740 97 or 72 3 J°

4/ 11

( 4 Il3/2)6Sl/2 ( 13/2,V2)° 7 5617:Oh or 74 51° 6 5849. 7

h

or 54 5 I°

4/' U( 4 Ill/2)6Sl/2 ( n/2,V2)° 5 8850.55 or 69 sr

6 9001.65 or 48 3J°

4y u(4 i°/2)6si/2 ( 9/2,V2)° 4 10838.85 or 67 5r

5 1120150 or 45 3J°

4/ 11( 4

Il5/2)5(/3/2 ( 15

/2,3/2)° 6 16281.60 or 80 5G°

7 1671^.98 or 82 5H°

9 17713.75 or 48 3 L

° 8 18404.87 or 47 5 r

4/ U( 4 Il5/2)5(/5/2 ( 15

/2,5/2)° 10 18258.95 or 97 5 L°

9 19111.47 or 74 5 K°

5 19882.92 or 57 5G°

8 20029.35 or 43 3 K°

6 20314-90 or 49 5 H

°

7 20492.00 or 46 3J°

5 19000.54

7,8 21688.7

7 24712.0

7,8 26008.3

4/ 11( 4

If 5/2)6pi/2 ( 15/2,V2) 7 26234.19 95 8 26330.85 97

4/ 11

( 4 Il5/2)6p3/2 ( 15

/2,3/2) 9 28926.70 97 8 29412.38 97 6 29588.49* 94 7 29899.21* 94

6 29074.26

7,8 29275.0

7,8 29325.2

7 29810.85

7,8 30884.7

4^ U( 4 Il3/2)6pl/2 ( 13/2,V2) 6 31505.0 95 7 31556.3 97

6 33882.7

6 34099.0

5 34653.7

4/ n( 4Ill/2)6pi/2 (“k.Va) 5 45 6 34770.4 51

4/U1

( 4 Il3/2)6p3/2 ( 13

/2,3/2) 7 34779.1 98 8 34802.8 99 6 35067.2 58 5 52

7,8 35559.3
Ho II—Continued

Configuration Term J

Level (cm 1 ) Leading percentages

4 36055.8

4 36884.1

5 37159.2

5 37499.0

4/ 11

( 4 Ill/2)6p3/2 ( U/2,3

/ 2) 7 37779.1 85 4 79 5 80 6 83

5 40332.8

Ho III ( 4 Il5/2) Limit 95200
308

Ho III

(Tb i sequence; 65 electrons) Z=67

Ground state (ls 2 2s 2 2p6 3s 2 3p6 3d I0 4s 2 4p6 4d 10 5s 2 5p6

) 4/*' 4 I°5/2

Ionization energy 184200± 800 cm 1 22.84± 0.10 eV

Identified odd configurations 4/ 11 and 4/ 10 6p

Identified even configurations 4/*°5d and 4/*°6s

The original analysis of this spectrum by McElaney [1964, 1967] gave 42 levels, including

the 4/ 11 4 I° ground-term levels and levels assigned to the other three known configurations.

The designations were based in part on calculations made by Becher [1965]. Hussain [1973]

added several levels to the analysis.

The levels here are from a recent extension of the analysis by Wyart, Crosswhite, and

Hussain [1977]. Some 80 of the 120 known levels were found in their investigation, with most

of the new levels belonging to the 4/ 10 5d configuration. The additions to 4/ 11 include the 4 F°

term, and the new 4/ 10 6s and 4/ 10 6p levels incorporate some revisions of Hussain’s analysis.

The eigenvector percentages are from Crosswhite and Wyart [1976], whose calculation for

the even group (4/

10 5d+4/’°6s) included configuration interaction. Some of the percentages

differ slightly from the values published by Wyart, Crosswhite, and Hussain because of

insignificant differences in the energy parameters used.

The known portions of the 4/ 10 6s and 4/ 10 6p configurations have clear Jjj-coupling

structures. A number of the 4/ 10 5d levels have no meaningful names in either the J x j or LS

coupling schemes, but some of the lower levels of this configuration have been grouped into

JJ terms. The leading percentages in LS coupling are given for the 4/ 10 6s and 4/ 10 5d levels,

instead of second percentages in J l j coupling. Only second percentages 3=10% in the J l j

scheme are listed for the 4/ 10 6p levels. McElaney’s thesis [1964] has about 9000 lines (1920-10877 A) assigned to the first four Ho

spectra. Electrodeless-discharge spectra (2500 A -4 /xm) obtained at the Laboratoire Aime

Cotton enable a more reliable separation of the Ho n and Ho hi lines, but the newly classified Ho hi lines have not been published. About 660 Ho hi lines are now classified as transitions

between the known levels. The lines typically have wide hyperfine structures, especially the

4/ 10 6s —4/

10 6p transitions. The positions of the 4/ 10 6s levels are based on the third diagonal

hyperfine component of such transitions, the second decimal place for these levels having little significance otherwise.

Wyart, Crosswhite, and Hussain note that attempts to find levels based on higher terms

of the 4/ 10 core have been mostly unsuccessful, and searches for the lowest 4/‘°6d and 4/ 10 7s

levels were inconclusive. They attribute most of the unclassified lines to configurations based

on the 4/ 9 core (4/

9 5d2

, 4/ 9 5d6s, 4/ 9 5d6p, 4/ 9 6s6p) and to transitions between higher levels of

4/ 11 and 4/ 10 5d. The ionization energy is from Sugar and Reader.

References

Becher, J., Thesis, Johns Hopkins Univ., Baltimore, 135 pp. (1965). PT

Crosswhite, H. M., and Wyart, J. F., unpublished material (1976). PT

Hussain, R., Thesis, Johns Hopkins Univ., Baltimore, 142 pp. (1973). EL CL Hfs PT

McElaney, J. H., Thesis, Johns Hopkins Univ., Baltimore (1964). EL CL W Hfs PT

McElaney, J. H., J. Opt. Soc. Am. 57, 870 (1976). EL

Sugar, J., and Reader, J., J. Chem. Phys. 59, 2083 (1973). IP Wyart, J. F., Crosswhite, H. M„ and Hussain, R., Physica (Utrecht) 85C, 386 (1976). EL ND PT

[February 1977]
309

Ho III

Configuration Term

J

Level (cm ') Leading percentages

4/ 11 4J° 15/ 2 0.00 97 3 2 K°

15/2 51#8.53 99 1 2 K°

11 1 

86U-59 85 12 2 H°2 9

/2 1077040 61 16 2 H°2

4/ 11 4p° 9

/2 13329.1,2 66 18 4 J° 7 /2 17868.1# 93 4 2G°1 5/ 

19375.33 86 11 2D°1 3

/2 66 17 2D°1

4/n 2 H°2 11 / 2 16891.20 48 38 4G°

4/ 10( 5 I 8)5(/3/2 (8, 3/ 2 ) 1S

/2 18033.40 83 or 52 ( 5I) 6 H

17/2 18099.14 67 or 73 ( 5 I) S I 13/2 19010.09 87 or 62 ( 5I) 6G

19

/2 19940.47 62 or 64 ( 5I) 6K

4/ 11 9

/2 21533.75 22 4 p° 19 2G°1

4/ 10( 5 I 8)6si/2 (8,V2 ) 17

/2 21824.15 94 or 79 ( 5

I) 6 I 15

/2 22993.98 92 or 69 ( 5I) 4 I

4/ 10( 5 I 8)5d5/2 (8, 5

/2) 21 / 2 22153.79 93 or 93 ( 5

I) 6 L

4/ 10( 5 I 8)5c/5/2 (8

5/ 2 ) 17

/2 22243.06 58 or 36 ( 5I) 4 K

4/ 10( 5I7 )M3/2 (7, 3/2 ) 13

/2 22431.10 58 or 35 ( 5I) 6 I n/2 23212.29 67 or 45 ( 5

I) 6G

17/2 25557.75 79 or 35 ( 5

I) 6 L

15/ 

26081.47 45 or 41 ( 5

I) 6 K

4/ 10( 5 Is)5f?5/2 (8, 5/ 2 ) 19/ 2 22504.08 60 or 52 ( 5

I) 4 L

4/ 10( 5 I7)5rf3,2 1S/2 22637.87 41 (7, 3/2) or 33 ( 5

I) 6H

4/

n 4G° n/2 59 29 2H°2 9/ 2 2388167 81 14 2H°2 7/ 

24648.07 45 24 2G°1 5/ 

28960.1# 93 3 2F°2

4/ 10( 5 I6 )5rf3,2 18/2 25699.23 25 (6, 3/ 2) or 27 ( 5

I) 6 I

4/' 10( 5 Ie)5(/3/2 (6, 3/ 2 ) ll/ 2 25973.40 55 or 45 ( 5

I) 6 I 9/ 

26603.07 59 or 42 ( 5

I) 6 H l 3

/2 28867.24 40 or 42 ( 5

I) 6 K

15/2 29162.57 86 or 57 ( 5I) 6 L

4/ 10( 5 l7)5r/s,2 (7, 5

/2) 15/2 27074.39 50 or 44 ( 5I) 4 I

4/' 10( 5 l7)6s 1 /2 (7.V2) 15/2 27180.12 95 or 70 ( 5 I) 6 I 13/ 2 27735.94 93 or 50 ( 5

I) 6 I

4/' 10( 5 l7)fx/5/2 (7, 5/ 2 ) 17/ 2 27260.26 76 or 42 ( 5

I) 6 K

4/ 10( 5I 7 )5t/5/2 (7, 5/2 ) 19

/2 27666.77 94 or 67 ( 5

I) 6 L

4/ 10( 5 Is)5(/5/2 13/2 27913.71 34 (8, 5/2 ) or 49 ( 5 I) 4 H

4/’ 10( 5 I5 )5rf3/2 (5

3/ 2 ) 9/ 

28683.36 51 or 45 ( 5 I) 6 I 7/ 

29148.88 48 or 42 ( 5

I) 6H

u/2 30618.22 53 or 55 ( 5

I) 6K

i3/ 2 31313.51 81 or 61 ( 5

I) 6 L

4/ 10( 5 I6 )5o?5/2 n/2 28724.89 32 (6, 5

/2) or 32 ( 5 I) 6 H

4/’ 10( 5 I 8)5c/s/2 (8, 5/ 2) U/2 28809.29 49 or 67 ( 5 I) 4G

4/ 10( 5 I4 )5</3/2 7/ 

30887.77 42 (4, 3/2 ) or 50 ( 5 I) 6 I
Ho III —Continued

Configuration Term J

Level (cm -1

) Leading percentages

4/ 10

( 5

l6)6.S'i/2 (6,v2 ) 11

1

2

30953.20 89 or 70 ( 5

I) 6I

l 3

/2 30997.66 91 or 47 ( 5 I) 4

I

4/ 10( 5 l5)5d5/2 9

/

2

31046.42 41 (5,5

/ 2) or 32 ( 5

I) 6H

4/ 10( 5

I6 )5c?5/2 (6

,

5

/2) 15

/2 31150.22 77 or 37 ( 5 I) 4R

4/ 10

( 5

I4)5o?3/2 5/2 31666.95 39 (4,3/2) or 63 (51) 6H

4/ 10( 5 l6)5rf5/2 (6,

5

/2 ) 17/ 2 31707.90 86 or 51 ( 5 I) 4 L

4/' 10

( 5

I6 )5(/5/2 13/2 31903.06 43 ( 6, 3

/2) or 44 ( 5 I) 4

I

4/ 10

( 5 l4)M3/2 (4

,

3

/2 ) 9

/2 32157.15 59 or 66 ( 5

I) 6R

Af 10( 5 l6)5<i5/2 n/2 32349.13 34 ( 6, 3

/ 2) or 41 ( 5 I) 4 H

4/ 10( 5 l4)5tfs/2 (4,

s

/2) 7

/2 32712.80 39 or 46 ( 5

I) 6G

5

/2 33923.10 62 or 71 ( 5

I) 6G

3h 90 or 87 ( 5 I) «G

n/2 36607.82 69 or 41 ( 5 I) 4K

l 3

/2 37300.35 84 or 76 ( 5

I) 4 L

9

/

2

37746.04 48 or 47 ( 5

I) 4I

4/ 10( 5 l4)5rf3/2 (4,3

/ 2 ) n/2 33046.50 86 or 78 (51) 6 L

4/ 10( 5l7)M5/2 9

/

2

33146.66 30 (7,3/2) or 30 (51) 4G

4/ 10( 5 Is)6si/2 (V/a) 9

/

2

33277.20 86 or 69 ( 5 I) 61

11

1

2

33875.59 83 or 65 ( 5

I) 4I

4/ 10( 5 F5 )5</3/2 9

/

2

33609.78 43 (5,3/2) or 39 ( 5 I) 4G

4/ 10( 5F5)5rf3/2 n/a 33644.25 35 (5,3/2) or 40 ( 5F) 6 F

4/ 10( 5 l5)5t?5/2 (5,

5

/ 2) 13/2 34066.99 57 or 26 ( 5

I) 4K

4/ 10( 5 l5)5<f5/2 (5,

5

/2) 15/2 34666.32 71 or 55 ( 5

I) 4 L

4/ 10

( 5 F5 )5d3/2 (5

,

3

/ 2) 13

/ 2 34759.72 49 or 29 ( 5F) 6 H

4/ 10

( 5 l4)6si/2 (4,V2) ?/2 35067.71 89 or 89 ( 5 I) el

9

/

2

36234.06 85 or 76 ( 5

I) 4I

4/ 10( 5 Is)5o?5/2 (5

,

5

/ 2 ) n/2 35203.80 50 or 32 ( 5

I) 4I

4/i°(5F5)5rf5/2 (5

,

5

/ 2 ) 15/2 35639.95 70 or 67 (5F) 6H

4/ 10( 5

I 5 )5rf5/ 2 9

/

2

35822.86 33 (5,3/2) or 38 ( 5

I) 4 H

4/ 10

( 5 F4)5rf3/2 11/2 35876.89 32 (4,3/2) or 32 ( 5F) 6 H

4/ 10

( 5

I6 )5(/5/2

7

/

2

36622.07 41 ( 6, 3

/ 2 ) or 58 ( 5 I) 4G

4/ 10( 5 F5 )6si/2 (5,V2 ) ll/ 2 37450.31 81 or 80 ( 5F) 6 F

9

/

2

38529.09 76 or 54 ( 5F) 4 F

4/ 10

( 5 F5 )5(/5/2 13/2 38551.49 43 (5,3/2) or 23 ( 5F) 4 H

4/ 10

( 5 l4)50?5/ 2

7

/

2

38680.01 29 (4,3/2) or 44 ( 5 I) 4 H

4/>°(5F4)5rfS/2 (4,

5

/2) 13/2 39388.26 49 or 49 ( 5 F) 6G

4/ 10( 5 F2)5c?3/2 3/

2

39399.24 30 (2,3/2) or 47 ( 5F) 6H

4/ 10

( 5 I4)5c?3/2 (4, 3

/ 2 ) 5/2 39633.40 45 or 66 ( 5

I) 4G

4/ 10( 5G6 )5(/3/2 n/a 42095.85 40 ( 6, 3

/ 2) or 26 ( 5G) 6G

4/ 10( 5G6 )5d3/2 (6, 3

/2 ) 13/2 42626.94 49 or 36 ( 5G) 6G
Ho III—Continued

Configuration Term J

Level (cm ') Leading percentages

4/ 10( 5G6)6si/2 (6,V2) 13

/ 2 44242.39 81 or 81 ( 5G) 6G

4/ 10

( 5 l8)6pi/2 (8//2)

0 15/2 571^97.72 93

17/2 57853.

92

4/ 10

( 5 l7)6pi/2 (7,V2

)° lS/2 621<8A.lp8 84 12 ( 5

I s) (8,3

/2)

0

15/2 628U-11 77 18

4/ 10

( 5

1 8)6p3/2 (8, 3

/ 2

)° X7/2 6280169 92

19/2 62912.63 93

15

/ 2 63468.62 74 19 ( 5 It) (7, 72)° 1S/2 64U5.86 80 12 ( 5l7) (7,72)°

4/ 10

( 5

I 6 )6pi/2 ( 6,V2

)° n/ 2 66128.33 89

13

/ 2 66493.62 92

4/ 10

( 5 l7)6p3/2 (7,3/2)° 15/2 67896.30 95

17/2 68104-87 97

i3/ 2 68266.03 93 n/ 2 68755.93 70 20 ( 5 Is) (5,V2)°

4/ 10( 5 Is)6pi/2 (5,V2

)° 9

/

68788.48 85

11/2 6914827 69 20 ( 5

I 7 ) (7,3/2

)°

4/ 10( 5

I4 )6pi/2 (4,V2

)° 7

/

70979.23 85

9

/ 71052.23 88

4/ 10( 5 l6)6p3/2 (6,

3

/ 2

)° 13

/ 2 71499.30 92

11 h 71611.84 91

15

/2 71784-40 94

9

/

72090.65 86

4/ 10( 5 F5 )6pi/2 (V/2

)° 9

/

72978.94 77 n/2 73420.46 76 10 ( 3 G5 2 ) ( 5 ,y2 )°

4/ 10

( 5 l5)6p3/2 (5,3

/ 2 )° 9

/2 741 40.80 84

11/2 74209.17 86

7

/2 74280.00 83

l 3

/

74530.99 89

4/' 10

( 5

I 4 )6p3/2 (4,

3/2)° 5

/2 75867.06 89

7

/ 2 76237.80 83

9

/

76355.20 87 n/ 2 76810.88 88

4/ 10

(5F5)6p3/2 (5,3

/2

)° l 3

/2 78048.95 76 n/ 2 78290.61 55 26 ( 5G6) (6,

1 / 2 )° 9

/ 2 79047.71 71 10 ( 3 G5 2) (5,3/2 )°

7

/ 2 77 10 ( 3 G5 2) (5,

3

/2

)°

4/ 10( 5G6)6pi/2 ( 6 ,V2

)° n/ 2 80190.52 50 21 ( 5Fs) (5,3/2

)° 13/2 80360.21 77

Ho IV ( 5 Is) Limit 184200
312

LHo iv]

(Gd i sequence; 64 electrons) Z=67

Ground state (ls 2 2s 2 2pfi 3s 2 3pfi 3d 10 4s 2 4p6 4d 10 5s 2 5pfi ) 4/ 10 rT„

Ionization energy 343000± 5000 cm 1 42.5± 0.6 eV

No analysis of the Ho iv free-ion spectrum is available. The 4/ 10 levels given here are based on the absorption and fluorescence spectra of Ho:u in LaCl:{ , mainly as observed by

Dieke and Pandey. All but three of the values are centers-of-gravity of the corresponding

sublevels in the crystal [Rajnak and Krupke], adjusted to a value of zero for the c.g. of the

ground level. The S F 1 , s Kft 2, and 5 G2 levels are from Crosswhite, Crosswhite, Edelstein, and

Rajnak [1976], who have extended the interpretation of the Ho3+ :LaCl3 spectrum. They

derived the level positions by first fitting a calculation to the observed sublevels. All levels are rounded off to the nearest 10 cm

-1

. Transitions to other 4/ 10 levels, mostly above those given here, have been observed in crystal spectra [Dieke, 1968, and references therein; Crosswhite et al., 1976] and in solution

absorption spectra [Carnall, Fields, and Rajnak, 1968].

Crozier and Runciman interpreted the levels of the 5 I,

5 F, and 5 S terms, as well as several

higher levels, in 1961. Eigenvector percentages may be found in their paper and in the papers

of Rajnak and Krupke [1967], Carnall et al. [1968], and Crosswhite et al. [1976], The

percentages given here are from unpublished calculations made by Carnall et al. [1974] with

matrices including effective interactions.

Sugar and Reader obtained the ionization energy, which is rounded off to three significant

figures. The estimated uncertainty has been approximately doubled, in accordance with the

suggestion of Spector and Sugar.

References

Carnall, W. T., Fields, P. R., and Rajnak, K., J. Chem. Phys. 49, 4424 (1968). [EL] ND [CL] [W]

Carnall, W. T., Fields, P. R., and Rajnak, K., unpublished material (1974). PT

Crosswhite, H., Crosswhite, H. M., Edelstein, N., and Rajnak, K., unpublished material (1976). [EL] ND [CL] [W] PT

Crozier, M. H., and Runciman, W. A., J. Chem. Phys. 35, 1392 (1961). [EL] ND [CL] [W] PT

Dieke, G. H., Spectra and Energy Levels of Rare Earth Ions in Crystals, Ed. H. M. Crosswhite and H. Crosswhite, pp. 279-294 (Interscience Publishers, New York, 1968). [EL] ND [W] [CL]

Dieke, G. H., and Pandey, B„ J. Chem. Phys. 41, 1952 (1964). [EL] [CL] [W]

Rajnak, K., and Krupke, W. F„ J. Chem. Phys. 46, 3532 (1967). [EL] ND PT

Spector, N., and Sugar, J., J. Opt. Soc. Am. 66, 436 (1976). Sugar, J„ and Reader, J., J. Chem. Phys. 59, 2083 (1973). IP

[October 1976]
313

[Ho IV]

Configuration Term J

Level (cm -1

) Leading percentages

4/ 10 5

I 8 0 93 5

3 K2

7 [5050] 97 2

3 K2

6 [8550] 95 2

3H4

5 [11110] 90 4

3 H4

4 [13180] 90 5

3 H4

4/ 10 5 F 5 [15370] 80 10 3G2

4 L 18450] 91 4

3F3

3 [20510] 90 4

3 D1

2 [20960] 63 14 5S

1 [22180] 80 15 3 D1

4/i° 5 S 2 [18320] 71 14 3P2

4/ 10 3 K2 8 [21240] 56 18 3 K1

7 [26030] 64 20 6 [29920] 74 17

4/ 10 5 G 6 [21990] 82 10 3H4

4 [25710] 58 15 3G2

5 [27540] 47 16 3 H4

3 [28700] 76 8

3F4

2 [30670] 51 11 3D1

5 [23830] 43 5G 19 3G2

Ho v ( 6 H?5/2 ) Limit 31*3000

225-298 0 - 78 - 21
314

ERBIUM

Er I

68 electrons

Ground state (ls 2 2s 2 2p6 3s2 3pfi 3d

Ionization energy 49262± 5 cm 1

Identified even configurations

Identified odd configurations

Z=68

l0 4s 2 4p6 4d 10 5s 2 5p«) 4/ 12 6s 2 3 H6

6.1078± 0.0006 eV

4/ 12 6s2

, 4/ 12 5d6s, 4/ n

6s 2 6p, 4/ u 5d6s6p, 4/ 12 6s7s,

4/ 12 6s8s, 4/ 12 6s6d

4/ n 5d6s 2

, 4/ n 5d2 6s, 4/ 12 6s6p, 4/ n 5d6s7s

Energy Levels, Lists of Lines

The first analysis of Er I by Marquet and Davis [1965] was based on accurate wavelength

measurements of about 8000 Er i and Er ii lines [Marquet, 1964] and on the Zeeman-effect

data of Lindner and Davis [1958], The levels of the 4/ 12 6s 2 :, H ground term and of the

4/ 12 6s 2 2 F term were among those identified. Marquet’s thesis [1964] gives the energy-level classifications for 172 Er i lines (2780-6781 A). Several investigators soon extended the

analysis and interpretation to include the 4/ n 5d6s 2 and 4/ 12 6s6p configurations [Marquet and

Behring, 1965; Spector, 1965; 1966; 1967; Racah, Goldschmidt, and Toaff, 1965]. Spector’s 1966

paper gives classifications for more than 300 Er I lines (2724-9927 A), and a few more are given in his 1967 paper. The most complete available lists of Er i and Er n lines with

experimental separation of the two spectra are given in Held’s 1966 report; a total of about

4500 lines are divided between the spectra over the range 2260-6900 A. Spector and Held

[1971] published wavelengths for 980 lines of Er i and Er n in the range 6614-11962 A, and

Held [1971] classified twelve of the Er i lines as transitions from three new even levels. Heilig and Kircher [1968] and Vander Sluis and McNally [1969] observed the Zeeman

effect, and their additional g values in general confirmed the analysis. Vander Sluis and

McNally give classifications and Zeeman patterns for about 75 lines (3181-4745 A) and list all levels for which g values had been determined.

The energy levels here are from unpublished lists of van Kleef and Root, who are continuing the analyses of Er I and Er n in collaboration with Wyart [van Kleef and Root,

1973; Wyart, Root, and van Kleef, 1974; van Kleef and Root, 1975], Much of the work is based

on extensive new measurements of the spectra by van Kleef and Root, but their lists of lines and classifications have not been published. Unpublished contributions to the Er i and Er n

analyses as available in 1973 were, however, used in the preparation of the Er line list given

by Meggers, Corliss, and Scribner [1975]; classifications are included for more than 900 of the

stronger Er i and Er n lines (2341-8870 A). Spector’s 1974 paper gives 45 Er i lines (3794-

11657 A) classified as transitions from the 4/ 12

(

:! H6 )6s7s levels, which he had identified.

g Values, Ionization Energy

Most of the g values are from van Kleef and Root [1975], who give their results to the nearest 0.005 units. Other investigators of the optical Zeeman effect in Er have determined g

values for a smaller number of levels, and the determinations for several of the lowest levels of each parity have stated probable errors as small as 0.001 to 0.003 [see especially the

summary tables of Vander Sluis and McNally]. We have tried to take suitable averages

wherever more than one determination was available. Smith and Spalding [1961] and Cabezas,

Lindgren, and Marrus [1961] first determined the J and g values of the 4/ 12 6s 2 ! H6 ground
Er I —Continued 315

level by the atomic-beam magnetic-resonance technique. Doyle and Marrus [1963] used this technique to obtain the g value quoted here for this level; they give the estimated error as ±0.00005.

Worden, Conway, Paisner, and Solarz [1977] have observed high members of two series in Erl by using laser techniques. These data became available too late for inclusion here, but the

quoted ionization energy is a new determination from the series.

Theoretical Interpretation of the Even Levels

The eigenvector percentages for the 4/ 12 6s2 3 H and 3 F levels are from Goldschmidt’s

thesis, second percentages less than 10% having been omitted for the even levels throughout.

Goldschmidt independently located the 3 F 3 and 3 F2 levels; no higher terms of the ground

configuration are yet known.

Wyart et al. [1974] noted that their calculation of the 4/"6s2 6p levels “represents a first step of a progressive theoretical study of the even energy levels.” The percentages here are from their later calculation of (4/"6s 2 6p+4/125d6s) [Wyart, Root, and van Kleef, 1976]. No

levels of this group having 2 have as yet been confirmed by the calculation. Wyart points out that the 4/"5d6s6p configuration should be added in a more complete calculation. Some

assignments to 4/ n

5d!6s6p are listed [van Kleef and Koot, 1975], but some preliminary

assignments to configurations and terms that have not yet been calculated are not given here.

A few of the assignments to eigenvectors of the (4/ n

6s2 6p+4/ 12 5d6s) group are listed as

tentative; these involve levels for which experimental g values have not yet been obtained.

The assignments of the 4/ 12 6s7s and 4/ 12 6s8s levels to terms in the J x J2 -coupling scheme

are from van Kleef and Koot [1975], Wyart et al. [1976] supplied the percentages for the

4/ 12 6s7s levels in this scheme. Some assignments to the 4/ 12

( 3 H)6s6d subconfiguration are

included tentatively in the region above 38000 cm 1 [van Kleef and Koot, 1975]; the 4/ u 5d6s6p,

4/"5d2 6p, and 4/ 12 6p 2 configurations are also known or expected to contribute to the levels in this region.

Theoretical Interpretation of the Odd Levels

The lower odd levels belong to the 4/ n

(

4 I°)5d6s2 and 4/ 12

( 3 H)6s6p( 3 P°) subconfigurations.

The term structures in this region clearly exhibit Jx j and JX J2 coupling, respectively, as was

noted by Spector [1965; 1966; 1967] and by Racah et al. [1966], Above about 21000 cm' 1

, however, very little term structure in any coupling scheme is apparent, and the system is further complicated by the 4/ n

(

4 I°)5d 2 6s subconfiguration beginning with the 7 Fg level at 20166 cnm 1 [van Kleef and Koot, 1975]. Thus all levels following the 4/ u

( 4 I

0 ii/2)5d5/ L.6s term are given here simply in order of position.

A major advance in the interpretation has been achieved with the calculation of (4/ I2 6s6p+

4/ n 5d6s 2 +4/u

( 4 I°)5d 2 6s) by Wyart et al. [1976]. All percentages given here are from this calculation, which at its present stage accounts for most of the odd levels up to about 35000 cm-1

. The

eigenvectors from the calculation are so far available only in LS coupling. The leading percentages in LS coupling for the low 4/ n

( 4 I°)5d6s 2 and 4/ I2

( 3 H)6s6p(3 P°) levels are given following the

word “or,” since these levels are grouped into/ij and/i/2 terms. Pending a coupling transformation to these latter schemes, we have not entered any term designations for the remaining levels of 4/ n 5d6s2 and 4/ 12 6s6p; the LS term notations for the leading percentages are given under

“Leading Percentages,” regardless of the percentage. LS-coupling names are listed for some of

the 4/n

( 4 I°)5<i 2 6s levels, however, according to our usual convention. Wyart et al. coupled the

electrons in the 4/12 6s6p configuration in a different order from that shown here, with the result

that we do not list a percentage for any 4/ 12 6s6p term having the same multiplicity as its 4/12 grandparent term. Depending on the possible relative sizes of such components in the eigenvectors, only partial information on the leading components is given for many of the assigned

levels; a number of such levels are listed entirely without configuration or term notations. Pre- liminary designations for levels not yet included in the calculations are also omitted here.

Van Kleef and Koot [1975] have assigned several of the highest known odd levels, beginning

at 41724 cm-1

, to the 4/ u( 4 I°)5d6s7s subconfiguration. The identifications are based on the

relative strength and character of transitions from these levels down to 4/n

( 4 I°)5c?6s6p levels.
316 Er I —Continued

References

Cabezas, A. Y., Lindgren, I., and Marrus, R., Phys. Rev. 122, 1796 (1961). ZE

Doyle, W. M., and Marrus, R., Phys. Rev. 131, 1586 (1963). ZE Hfs

Goldschmidt, Z. B., Thesis, Hebrew Univ. Jerusalem, Israel, 487 pp. (1968). EL PT

Heilig, K., and Kircher, 0., Z. Phys. 212, 243 (1968). ZE

Held, S., Israel, A.E.C. Report IA-1037, 163 pp. (1966). W

Held, S., Astrophys. J. 167, 203 (1971). EL CL

Lindner, J. W., and Davis, S. P., J. Opt. Soc. Am. 48, 542 (1958). ZE W

Marquet, L. C., Thesis, Univ. California, Berkeley, 130 pp. (1964). EL CL W ZE PT

Marquet, L. C., and Behring, W. E., J. Opt. Soc. Am. 55, 576 (1965). EL

Marquet, L. C., and Davis, S. P., J. Opt. Soc. Am. 55, 471 (1965). EL ZE

Meggers, W. F., Corliss, C. H., and Scribner, B. F., Nat. Bur. Stand. (U.S.) Monogr. 145, Part I, 403 pp. (1975). CL W

Racah, G., Goldschmidt, Z. B., and Toaff, S., J. Opt. Soc. Am. 56, 407 (1966). EL

Smith, K. F., and Spalding, I. J., Proc. R. Soc. London, Ser. A 265, 133 (1961). ZE

Spector, N., J. Opt. Soc. Am. 55, 576 (1965). EL

Spector, N., J. Opt. Soc. Am. 56, 341 (1966). EL CL PT

Spector, N, J. Opt. Soc. Am. 57, 308 (1967). EL CL

Spector, N., J. Opt. Soc. Am. 61, 1350 (1971). EL CL W PT

Spector, N., Phys. Scr. 9, 313 (1974). EL ND

Spector, N., and Held, S., Astrophys. J. 167, 193 (1971). W

van Kleef, T. A. M., and Root, J. J. A., J. Opt. Soc. Am. 63, 1315A (1973). van Kleef, T. A. M., and Koot, J. J. A., unpublished material (1975). EL ND CL ZE

Vander Sluis, K. L., and McNally, Jr., J. R., J. Opt. Soc. Am. 59, 1202 (1969). EL CL ZE

Worden, E. F., Conway, J. G., Paisner, J. A., and Solarz, R. W., unpublished material (1977). IP Wyart, J. F., Koot, J. J. A., and van Kleef, T. A. M., Physica (Utrecht) 77, 159 (1974). EL ND ZE PT

Wyart, J. F., Koot, J. J. A., and van Kleef, T. A. M., unpublished material (1976). PT

[May 1977]

Er I, Even Parity

Configuration Term J

Level (cm-1

) 9 Leading percentages

4/ 12 6s2 3 H 6 0.000 1.16381 99 5 6958.329 1.031 100 4 10750.982 0.936 65 23 3F

4f

12 6s2 3 F 4 5035.193 1.147 68 25 3 12377.534 1.065 100 2 13097.906 0.750 79 20

4/ 11( 4

Ii 5/ 2 )6s2 6pi/2 ( 15/2,V2) 7 16464.934 1.237 95 8 16727.479 1.175 97

4/ 11( 4 Il5/2)6s2 6)03/2 ( 15

/2, 3

/2) 9 19355.149 1.225 97 8 19723.271 1.210 97 6 19816.936 1.165 96 7 19915.789 1.185 94

4/ 12

( 3Hs)5d6.s( 3B) 3[4] 5 19362.105 1.390 92 4 20497.641 1.280 76 12 ( 3He)( 1 D) ![4] 3 22391.431 89

4/ 12

( 3Hi3/2 )5o?6.s( 3D) 3[5] 6 21035.201 1.325 92 5 22056.785 1.195 72 12 ( 3He)(3D) 3

[6] 4 23300.042 1.125 57 17 ( 3 He)( 1 D) J [4]

4/ 12

( 3H6 )5tf6s( 3D) 3[8] 8 21069.365 1.155 93 7 21101.510 1.025 95 9 21204.465 1.215 99

4/ 12( 3 H6 )5rf6s( 3D) 3[6] 7 22521.790 1.215 52 40 ( 3He)(3D) 3[7] 5 23314.115 1.050 81 12 ( 3He)( 3D) 3[5] 6 23432.428 1.100 49 34 ( 3Hg)(3D) 3[7]

4/ 12

( 3He)5d6s(3D) 3[7] 6 22691.855 1.095 53 38 ( 3He)(3D) 3[6] 8 22810.531 1.210 92 7 23336.111 1.185 46 27 ( 3He)(3D) 3[6]
317

Er I, Even Parity—Continued

Configuration Term J

Level (cm 1

) 9 Leading percentages

4/ n( 4I°)5d6s6p 6 22979.591 1.415

4/

11

( 4

Ii 3/ 2 )6s

2 6pi/a ( 13

/2 ,V2 ) 6 23144.252 1.150 86 10 4/ 12

( 3 He)5d6s(3D) 3[7] 7 23223.335 1.070 77 12 4/ 12

( 3He)5d6s(3D) 3

[ 6]

4/ 11

( 4I°)5d6s6p 7 23628.936 1.360

4f

12

( 3He)5d6s( , D) J f4] 4 24007.135 1.175 56 26 ( 3He)( 3D) 3[5]

4/ 12( 3He)5d6s( 1 D) ‘[8] 8 24105.439 1.130 96

4f 11

( 4I°)5d6s6p 8 24721.193 1.295

4f

ll

( 4l°)5d6s6p 5 24991.084 1.295

4/ 12( 3He)5t/6s( 1 D) 1 [5] 5 25167.750 1.225 79

4/ n(4 I°)5rf6s6p 9 25220.194 1.110

4/11

(4I°)5rf6s6p 6 25479.243 1.255

4/ 11

(4 I°)5rf6s6p 10 25619.339 1.165

4/ 12( 3 He)5rf6s( 1 D) J [7] 7 25705.006 1.125 96

4/ n( 4 I°)5o?6s6p 7 25861.232 1.275

4/ 12( 3He)5rf6s( 1 D) H6] 6 25894.942 1.160 90

4/

11

( 4 Il 3/ 2) 6s

2 6p3/2 ( 13

/ 2, 3

/ 2 ) 8 25942.577 1.160 99 5 26038.897 1.075 85 6 26208.982 1.065 84 * 10 ( 4

Ill/2 ) ( n/ 2,V2 ) 7 26271.240 1.145 98

4/ 11

( 4 I°)5d6s6p 9 26099.600 1.175

4/ u(4 I°)5d6s6p 7 26136.777 1.305

4/ 12

( 3F4 )5d6s(3D) 3 26154.466 32 3[3] 17 ( 3F4 )( 3 D) 3[2]

4/ 12

( 3F4 )5d6s( 3D) 4 26164.487 36 3[4] 27 (3Hs)( 1 D) >[4]

4/ n( 4 I°)5o?6s6p 8 26268.076 1.125

4/ 12

( 3 F4 )5d6s( 3D) 5 26554.001 1.200 33 3[5] 28 ( 3F4 )( 3D) 3[4]

4/ 12

( 3 F4 )5d6s( 3D) 3 [5] 6 26721.260 1.235 50 13 ( 3F4 )( 3D) 3

[ 6] 4 26993.949 50 16 (

1 G4 )( 3 D) 3[5] 5 27467.826 1.190 35 25 ( 3F4 )(3D) 3[4]

4/ n

( 4 I°)5d6s6p 11 26786.589 1.210

4/

l,

( 4 Ifi/2)6s

2 6pi/2 ( n/ 2,V2) 5 26830.768 1.070 57 12 ( 2Hl 1/2 2) ( 11

/2 ,V2 ) 6 26910.890 1.060 68 13

4/ 12

( 3 F4 )5tf6s( 3D) 3 26857.624 27 3

[ 2] 27 ( 3H4 )(

1 D) i[3]

6 26993.004 1.240 4/ 12

( 3F4 )5d6s( 3D) 5 27022.594 1.000 28 3

[ 6] 17 ( 3F4 )( 3 D) 3f4] 4/ 11

( 4I°)5d6s6p 8 27178.899 1.270 4/11

( 4 I°)5d6s6p 9 27198.075 1.265 4/ 12

( 3 F4 )5d6s( 3D) 6 27336.241 1.130 34 3

[ 6] 20 ( 3F4 )(3 D) 3[5] 4/ 11

(4I°)5d6s6p 10 27380.309 1.235
318

Er I, Even Parity—Continued

Configuration Term J

Level (cm ') 9 Leading percentages

4/ 12

( 3H5 )5c?6s( 3D)? 4 27391.885 44 3[3] 12 ( 3F4 )(3 D) 3

[4] 4/ n(4I°)5d6s6p 7 27459.437 1.250 4/ n( 4 I°)5rf6s6p 8 27578.745 1.280 4/ 12

( 3F4 )5d6s( 3D) 3[6] 7 27625.541 1.225 52 20 (

x G4)(3D) 3[6] 5 27747.206 1.240

4/ 12

( 3Hs)5rf6s( 3D) 3[7] 67

27819.334 1.030 91

8 28579.006 1.120 100

4/ 12( 3F4)5d6s( 3D)? 3 27839.291 15 3[3] 14 ( 3H4 )0D) x [3] 6 27932.038 1.105 4/ n( 4I°)5d6s6p 10 27977.129 1.205 4/ n( 4 I°)5d6s6p 9 28043.271 1.230 4/ 12

( 3 Hs)5c?6s( 3D)? 3[3]? 3 28109.637 53 13 ( 3Hs)(3 D) 3[4] 4/ 11

( 4 I°)5rf6s6p 7 28288.072 1.180 4/ n( 4I°)5d6s6p 8 28397.139 1.185 4/ 12

( 3Hs)5d6s(3D)? 4 28405.430 36 3[3] 16 ( 3F4)( 3D) 3[4] 4/ n( 4 I°)5d6s6p 9 28406.458 1.195 4/ 11 5d6s6p 5 28516.337 1.175 4/ n( 4 I°)5rf6s6p 10 28598.169 1.235 4/ 11 5d6s6p 8 28699.849 1.180

4/ 11

( 4 l9/2)6s2 6pi/2? ( 9/2,V2)? 4 28754.019 39 17 ( 2 H9

°

/2 2)( 9/2,V2) 5 28980.740 44 19

4/ 11 5d6s6p 9 28839.974 1.160 4/ 11 5d6s6p 7 28918.439 1.140 4/ n( 4 I°)5d6s6p 11 29013.821 1.230

4/ 12

( 3 H5 )5rf6s( 3D) 3t4] 5 29069.482 1.195 76 4 29269.579 1.110 64 3 29422.769 53 10 ( 3Hs)(3D) 3[3]

6 29138.739 1.135 9 29201.811 1.150 4/ 11

( 4I°)5d6s6p 12 29280.254

4/ 12

( 3Hs)5d6s(3D) 3[6] 5 29372.716 0.955 54 31 ( 3Hs)(3D) 3[5] 6 29445.385 1.130 43 43 ( 3H5 )( 3D) 3[5] 7 30091.528 1.165 92

8 29451.894 1.270 4/ 11

(4 I°)5d6s6p 10 29648.807 1.205

4/ 11

( 4I!i/2)6s2 6p3/2 ( U/2

,

3

/2) 7 29681.661 1.070 83 15 ( 2 H?1/2 2)( 11/2, 3/2) 4 29682.975 71 11 5 29829.740 1.020 71 13 6 29989.842 1.140 74 14

8 29760.553 1.115 6 29801.226 1.185

4/ 12( 3F4 )5d6s( 1 D) 1[5] 5 29907.781 1.095 66 18 (

1 G4 )(1 D) 1 [5]
319

Er I, Even Parity—Continued

Configuration Term J Level (cm -1

) 9 Leading percentages

8 29930.780 1.215 7 29967.871 1.235 4 29973.606

10 30108.818 1.250 4/ 12

( 3Hs)5d6s(3D)? 3[5]? 5 30126.549 52 26 ( 3Hs)(3D) 3[6] 5 30149.954 1.205 6 30178.876 1.195 9 30207.544 1.120 4/ 12

( 3F4)5d6s( 1 D)? 3 30228.456 33 J [3] 14 (3H5)(

1 D) ![3]

4/ 12

(3F4)5d6s( 1 D)? 1 [4]? 4 30266.098 52 15 CG^FD) ![4]

6 30287.344

9 30377.872 1.220 6 30468.385 1.200 7 30482.255 1.080 7 30693.281 1.245 8 30726.736 1.180 7 31105.652 1.165 5 31122.407 1.155 9 31165.788 1.275 4 31264.872 1.100 10 31270.736 1.280 6 31338.460 1.025 5 31414.487 1.180 6 31523.757 1.150 8 31559.825 0.990

7 31565.930 1.200

4 31712.639 1.150

4/ 12( 3He)6s7s( 3Si

)

(6,1) 7 31719.664 1.285 99 6 31946.417 1.195 98 5 32218.588 1.050 99

8 31826.551 1.180

4/ 12

( 3H4 )5rf6s( 3D) 3[6] 5 31852.671 0.880 60 31 ( 3F4 )(3D) 3[6] 6

7 32846.488 1.110 62 26 ( 3F4)(3D) 3 [6]

6 31878.788 1.175 9 31906.689 1.220 7 32001.445 1.105 5 32023.763 1.100 6 32036.165 1.020 6 32212.455 1.115 7 32245.395 1.065 9 32301.601 1.120 6 32368.230 1.075
320

Er I, Even Parity—Continued

Configuration Term J

Level (cm -1

) 9 Leading percentages

8 32525.666 1.170 7 32799.498 1.075 8 32884.867 1.145 5 32962.601 1.130 4/ 12

( 3H4 )5c?6s( 3D) 5 33034.654 1.050 35 3[5] 14 ( 3H4 )(3D) 3[4] 6 33139.808 1.065

4/ 12( 3He)6s7s( 1 So) (6,0) 6 33519.739 1.180 98

10 33619.332 1.160

4/ 12( 3 H4 )5tf6s( 3D) 3f5] 6 33750.645 1.100 52 20 (

1 G4 )(3 D) 3[5] 6 33853.872 1.240

10 33942.292 1.118

6 34055.264 1.190

7 34153.760 1.160 9 34224.049 1.205 8 34288.437 1.190 6 34313.100 1.235

5 34393.833 1.070

5 34447.758 1.090 6 34457.999 1.183

9 34587.802 1.135

7 34596.396 1.025

9 34724.897 1.165

7 34733.243 1.110

8 34756.580 1.140 8 34990.233 1.135 7 35014.743 1.190 5 35185.409 1.140

7 35191.459 0.965 6 35218.609 1.080 8 35300.412 1.125

5 35328.671 1.125

6 35370.371 1.195

7 35394.592 1.130 9 35402.733 1.170 4 35428.605 1.105 8 35493.301 1.170 6 35557.173 1.085 8 35632.606 1.180 6 35667.077 1.060

5 35680.994 1.155

7 35717.098 1.210 8 35794.481 1.220 7 35833.788 1.050
321

Er I, Even Parity—Continued

Configuration Term J

Level (cm -1

)

[ 9 Leading percentages

6 35918.454 1.095 5 35952.787 1.005 6 35963.366 1.085 6 36026.864 1.185 6 36051.449 1.195

7 36123.034 1.180 8 36130.860 1.050

9 36136.191 1.165 6 36306.253 0.975 9 36321.915 1.130

7 36418.402 1.130

10 36461.845 1.180 9 36494.167 1.140 6 36511.221 1.175

5 36516.831 1.155 5 36710.827 1.150

10 36712.578 1.120 7 36735.742 1.195 6 36876.457 1.160

4yi2(3F4)6s7s( 3Si) (4,1) 5 36883.886 1.255 70 21 (

1 G4)(3Si) 4 37014.608 1.135 67 22 3 37144.092 0.890 66 24

5 36898.613 1.110

6 36979.594 0.940 4 36997.475 1.055 8 37021.273 1.170

6 37044.419 1.125 9 37062.822 1.170

7 37178.437 1.180 6 37199.912 1.070

9 37271.015 1.095

8 37378.443 1.195

7 37391.232 1.100

6 37542.792 1.150

10 37593.886 1.205 8 37645.754 1.200 7 37714.613 1.205

7 37806.983 1.090 8 37843.845 1.170 8 38164.906 1.225 5 38169.753 1.085 9 38172.809 1.190 7 38195.326 0.970 4/ 12

( 3H)6s6d? 5 38225.984 1.370
322

Er I, Even Parity—Continued

Configuration Term J

Level (cm -1

) 9 Leading percentages

8 38253.685 1.160 7 38301.613 1.095 8 38343.693 1.135

4/ 12( 3 H)6.s(x/? 6 38407.470 1.320

4/ 12( 3 H)6s6t/? 9 38424.655 1.210

6 38457.832 1.130

9 38487.253 1.220

4/ I2

( 3 H)6,s6tf? 7 38545.334 1.130

4/ 12

( 3H)6s6tf? 8 38556.751 1.180

7 38560.986 1.100

4/ 12( 3 H)6s6flf? 4 38587.912 1.210

6 38604.588 1.095 4 38657.464 1.120

7 38664.249 1.170

4/ 12

( 3H)6s6<f? 6 38667.799 1.150

4/' 12

( 3 H)6s6rf? 8 38668.310 1.195 5 38703.037 1.110

8 38734.243 1.135

4/ 12( 3 H)6s6tf? 7 38751.622 1.180

6 38786.542 1.005

4/' 12

( 3 H)6s6</? 5 38795.477 1.165

4/ 12

( 3H)6s6rf? 7 38797.084 1.075

5 38831.967 1.170

4/ 12( 3 H)6s6</? 8 38834.142 1.130

7 38857.639 1.150

4/' 12

( 3H5 )6s7s( 3Si) (5,1) 6 38870.770 1.180 100 5 38893.172 1.045 100 4 38921.185 0.855 98

4/ 12( 3 H)6s6cf? 6 38923.586 1.105

7 38986.765 1.075 6 39010.445 1.050

8 39049.481 1.180

10 39062.614 1.255

4/ 12

( 3H)6s6d? 7 39070.645 1.145

6 39075.883 1.145

4/ 12( 3 H)6s6rf? 5 39125.605 1.040

7 39145.450 1.130

6 39164.268 1.140

4/ 12

(3H)6s6d? 6 39193.564 1.115

4/ 12( 3H)6.s6rf? 4 39237.878 1.040

6 39256.456 1.140

6 39350.505 1.155

7 39359.683 1.175 8 39432.657 1.160
323

Er I, Even Parity—Continued

Configuration Term J

Level (cm *) g Leading percentages

5 39506.183 1.135 8 39525.603 1.110

9 39561.400 1.190

6 39658.18

1.110

7 39738.475 1.150

6 39747.336 1.140

5 39812.042 0.985 8 39843.429 1.180

6 39971.070 1.040

6 40024.539 1.060

5 40053.465 1.105 7 40131.326 1.150 6 40140.639 1.000

7 40159.218 1.185 6 40333.576 1.020

5 40343.428 1.145 8 40429.677 1.180 9 40440.079 1.060

4/ 12( 3He)6s8s( 3Si)? (6,1)? 7 40497.423 1.285 6 40671.753 1.170 5 40961.359 1.030

5 40714.266 0.990 6 40769.043 1.120

7 40833.983 1.155 6 40840.932 1.110

7 40878.897 1.150 8 41168.151 1.030

7 41269.956 1.200

6 41386.325 1.205 6 41407.821 1.150

5 41603.847 1.130 6 41739.398 0.995 7 41809.765 1.145 6 41907.318 1.135

7 41989.925 1.110

4/ 12

( 3H6 )6s8s( 1 So)? (6,0)? 6 42353.837 1.170

5 42360.935 1.130 8 42376.272 1.200 6 42387.920 1.135 5 42542.173 1.110

4/ 12

( 3 H4 )6s7s( 3Si) (4,1) 3 42611.413 0.705 63 26 ( 3F4 )(3Si) 4 42681.708 1.010 62 25 5 42736.803 1.095 62 23
324

Er I, Even Parity—Continued

Tern1 J

Level (cm ‘) 9

6 42627.566 1.165 8 42632.533 / 1.170 7 42671.747 1.130 8 42797.550 1.130 9 42806.697 1.200 6 42882.350 1.110 6 43191.617 1.105 6 43298.210 1.135 7 43518.518 1.205 8 43537.586 1.140 8 43586.058 1.130 7 43826.668 1.090 6 43870.496 1.170 6 43934.136 1.255 9 43982.879 1.215 7 44039.685 1.160 8 44041.430 1.135

10 44112.202 1.095 6 44194.771 1.190 8 44201.047 1.030 8 44301.508 1.120

(3,1) 3 44308.935 1.150 2 44347.866 0.870 4

7 44394.215 1.125 8 44410.891 1.150 9 44525.705 1.140

7 44827.907 1.100 12 44872.599 1.190

(2,1) 1 44886.482 0.105 2 45060.489 0.850 3 45246.857 1.105

11 45195.732 1.195

7 45325.988 1.125

7 45874.406 1.050

7 46970.808 1.145

Limit 49262

Configuration Leading percentages

4/ 12

(3F3)6s7s( 3Si)

4/ 12

( 3F2 )6s7s( 3Si)

Er ii ( 3He)6si/2 ( 6,^/2) 13/2

9393

82 17 75 16 73 16
325

Er I, Odd Parity

Configuration Term J

Level (cm 1

) 9 Leading percentages

4f U( 4

1 15/2)5^3/2 6s2

( 15/2,3

/2

)° 6 7176.503 1.302 or 78 (41°) sG

° 7 7696.956 1.266 or 78 (41°) s H

° 9 8620.565 1.150 or 47 ( 4D 3L° 8 9350.106 1.180 or 42 ( 4I°) 51°

4/11

(4 Ii5/2)5d5/2 6s2( 15

/2,5

/ 2

)° 10 9655.848 1.194 or 96 ( 4

I°) 5 L°

9 10557.916 1.178 or 71 (41°) 5 K

° 5 11401.197 1.205 or 50 ( 4 I°) 5G°

8 11557.670 1.178 or 46 ( 4 I°) 5)° 6 11799.778 1.190 or 38 (41°) 5 H

° 7 11887.503 1.153 or 47 (4p) 3I

°

4/ 11( 4 Il3/2)5c?3/2 6s2

( 13

/2,3

/ 2

)° 8 15083.114 1.050 or 53 (41°) 5 L

° 5 15185.352 1.160 or 55 (41°) 3Q°

7 15846.549 1.070 or 44 (41°) 5 K

° 6 16070.095 1.200 or 48 ( 4 I°) 3 H°

4/ 12( 3He)6s6p(3Po) (6,0)° 6 16321.110 1.220 or 71 ( 3H)(3P°) 5G°

4/ 11( 4

Ii3/2)5c?s/2 6.s2

( 13/2,5/2)° 4 16472.783 1.075 or 64 ( 4 I°) 5G°

9 16501.416 1.155 or 67 ( 4

I°) 5 L

° 5 17029.058 1.150 or 32 ( 4I°) 5 H

° 8 17297.668 1.105 or 58 ( 4 I°) 5 K

° 6 17456.383 1.070 or 23 ( 4 I°) sp

7 17796.139 1.110 or 50 ( 4 I°) 5)°

4/ 12

( 3He)6s6p( 3Pf

)

(6,1)° 6 17073.800 1.070 or ( 3H)( 3P°) 3 I° 7 17157.307 1.195 or 40 ( 3H)( 3P°) 5 I° 5 17347.860 1.175

4/ 12( 3He)6s6p( 3P2) (6,2)° 8 18335.496 1.250 or 99 ( 3H)(3P°) 5 I° 4 18816.623 1.050 7 19125253 1.235 or 67 ( 3H)(3P°) 5 H°

5 19201.343 1.060 6 19326.598 1.180 or ( 3H)(3P°) 3 H°

4/ 11( 4 Iii/2)5f/3/2 6s2

( 11 /2i 3

/ 2

)° 7 18774.123 0.965 or 47 ( 4 I°) 5 L

° 4 19047.815 1.010 or 25 ( 4 I°) 3G

° 6 19508.432 0.960 or 36 ( 4

I°) 5 K

° 5 19563.116 0.990 or 22 ( 4

I°) sp

4/ 11

( 4 Iii/2)5ds/2 6s2

( n/2,5 /2)° 3 19269.640 or 47 ( 4p) 5G

° 8 20566.805 1.050 or 42 ( 4 P) 3 L

° 4 20619.731 1.065 or 26 ( 4 P) 5 H

° 7 21168.430 1.065 or 33 ( 4 P) 3 K

° 5 21392.817 1.005 or 17 ( 4 P) 3p

6 21701.885 1.055 or 26 ( 4 P) 3p

4/ n( 4 I°)5rf2

( 3F) ( 6 F°)6s 7p° 6 20166.130 1.485 85 13 ( 4P)( 3F) (6G°) 7Q°

4/n(4 I°)5d 6s2 6 20737.723 0.855 50 5 L°

4/ 1I( 4I°)5d 6s2 5 20917276 0.980 23 5K°

4/ n( 4I°)5<7 6s2 4 20929.873 1.050 29 3G0

4/ 12

( 3F)6s6p(3P°) 4 21551.919 1.245 28 5D

°

4/ n( 4 r)5(/2

( 3 F) ( eG°)6s 7G° 7 21787.932 1.350 48 31 ( 4P)( 3 F) (6H°) 7H

°

4/ 11

( 4 P)5tf2

( 3F) (6i°)6s 8 21979.181 1.295 38 7J° 37 ( 4 P)(3 F) (6 H°) 7 H°

4/ n( 4 I°)5t/2

( 3F) ( 6 I°)6s 7 I° 9 22102.844 1.270 51 36 ( 4 P)(3F) (6K°) 7 K

°

4/ 12

( 3F)6s6p( 3P°) 5 22124268 1.285 29 5p°

3 22269.457 1.065 4 22361.651 1.045 4/ n( 4 I°)5(/2

( 3F) ( 6F°)6s 5 22450.111 1.360 40 7 F°

4/ 11

(4F°)5d 6s2 6 22583.504 1.130 37 5G

°
326

Er I, Odd Parity—Continued

Configuration Term J

Level (cm -1

) 9 Leading percentages

4/ n( 4 I°)5d 6s2 4 22649.973 0.985 36 5 I°

4/ n(4 I°)5d 6s2 5 22672.766 1.040 25 5 K°

4/ n( 4 I°)5d2( 3 F) ( 6 K°)6s 7 K

° 10 22673.147 1.260 73 18 ( 4 I°)( 3F) ( 6 L°) 7 L°

4/ 11

(4 I°)5d 6s2 7 23080.952 1.010 41 3 L°

4/ 11

( 4 I°)5d2

( 3 F) ( GH°)6s 6 23311.577 1.250 22 7H°

4/ n( 4 I°)5c?2( 3 F) ( 6G°)6s 7 23364.853 1.225 26 7G°

4/ 12

( 3 H)6s6p 5 23447.079 1.080 4/ n( 4 I°)5rf2

( 3 F) ( 6M°)6s 7M° 11 23472.602 1.215 52 24 ( 4I°)(3 F) ( 4M°) 5M°

4/ n( 4 I°)5d2( 3F) ( 6 H°)6s 8 23502.223 1.240 31 7 H°

9 23619.088 1.090 4/ n( 4 I°)5rf2

( 3 F) ( 4 M°)6s 10 23696.036 1.150 33 5M° 23 ( 4 I°)( 3F) ( 6M°) 7M°

4/ u( 4 I°)5rf2

( 3 F) ( 6M°)6s 7 M° 12 23720.930 1.250 99 1 ( 4 N°) 5 N°

4/ 12( 3F)6s6p(3P°) 6 23831.359 1.250 57 5G°

4/ 12

( 3F)6s6p(3P°) 5 23855.654 1.140 30 5F°

4 23883.631 1.160

4/ 12( 3H)6s6p 5 23885.406 1.100

3 24068.358 1.065

4/ 12

( 3 H)6s6p 5 24083.166 1.128

4/ 12

(

1 G)6s6p(3P°) 2 24089.615 0.805 31 3F°

9 24228.006 1.130

4/ 12( 3 H)6s6p(3 P°) 6 24246.146 1.085 44 5I°

4/ 12

( 3H)6s6p 4 24348.910 1.045

4/ n(4 I°)5c? 6s2 6 24457.139 1.050 25 3K°

4/11

(4I°)5d 6s2 3 24712.734 0.970 49 3G°

4/ u( 4 I°)5c?2( 3 F) ( 6 L°)6s 7 L° 11 24754.413 1.235 71 19 ( 4 I°)( 3F) ( 4M°) 5M°

8 24883.530 1.120

4/ 12( 3H)6s6p 7 24943272 1.160

4/ n( 4 I°)5d 6s2 4 25000.729 1.060 29 3H°

4/ n( 4 I°)5rf2

( 3 F) ( 6F°)6s 4 25145.891 1.310 27 7F°

7 25159.143 1.170

4/ n( 4I°)5d 6s2 5 25162.553 1.010 21 3 I°

4/ n( 4 I°)5rf2( 3 F) ( 6G°)6s 6 25268259 1.185 20 7G°

4/ 11

(4I°)5d2(3F) ( 6 L°)6s 10 25318.549 1.190 32 7 L° 28 ( 4

I°)( 3F) ( 4 L°) 5L°

5 25364.012 1.180

4/ n( 4F°)5c? 6s2 6 25392.779 1.075 24 5G°

4/ 12( 3 H)6s6p 3 25463.519 0.810

4/ 12( 3H)6s6p(3P°) 7 25598286 1.155 52 5I°

4/ n( 4F°)5(/ 6s2 5 25681.933 1.175 21 5F°

4/ 11 5c? 6s2 4 25753.933 0.955

4/ n( 4I°)5d2( 3P) ( 6 I°)6s 7 J

° 9 25863.453 91

4/ n( 4I°)5rf2

( 3F) ( 4 L°)6s 9 25871.936 23 5 L°

4/ 12( 3 H)6.s6p 6 25880274 1.150

4/ 12

( 3 H)6s6p 4 26017209 0.920

4/ n( 4 I°)5c?2

( 3P) ( 6 I°)6s 8 26093279 40 7I° 32 ( 4I°)( 3P) ( 6H°) 7H°

4/ 12

( 3H)6s6p(3 P°) 5 26198.837 1.045 48 5H°
327

Er I, Odd Parity—Continued

Configuration Term J

Level (cm -1

) 9 Leading percentages

4/ 12( 3H)6s6p(3P°) 6 26237.004 1.160 38 5 H°

8 26478.964

4/ n( 4S°)5d 6s2 3 26584.827 1.360 44 5D°

4/ 11( 4 I°)5c/2

( 3 F) ( 6F°)6s sp° 5 26660.001 1.365 62 17 ( 4 I°)( 3F) ( 6F°) 7 F°

7 27230.646 1.135

4/ 11

(4 I°)5d2

(3P) 6s 7 27306.757 1.225

6 27582.017 1.120

4 27629.917 1.260 4/ n( 4I°)5d2 6s 9 27674-801 4/ 12

( 3 H)6s6p(3P°) 4 27777.315 1.020 18 5 I° 3 27809.090 0.970 4/ ll

( 4 I°)5t/2( 3 F) ( 6 H°)6s 7 27822.866 1.255 30 5H° 21 enCD) ( 4 H°) 5 H°

5 27856.436 1.095 6 27879.416 1.175

4/ n 5c?6s2 7 28017.584 1.080 5 28026.045 1.120

4/ n( 4 I°)5rf2( 3 F) ( 6G°)6s 6 28053.943 1.240 28 5G°

4/ 12( 3H)6s6p( 3P°) 4 28082.794 1.075 21 5 I° 5 28129.803 1.040

3 28226.856 1.085 4/ n( 4F°)5f/ 6s2 3 28290.396 1.140

4 28357.384 1.250 4 28640277 1.220 4/ 12

( 3 H)6s6p(3 P°) 2 28789.099 0.630 27 5G°

6 28854.941 1.190 4/ n( 4 I°)5</2

(

1 D) ( 4 I°)6s 8 28876246 1.210 19 5I° 17 ( 4 I°)( 3 F) ( 6 K°) 7 K°

4/ 12

( 3 F)6s6p 3 28996.512 1.080 4/ n( 4 F°)5<f 6s2 2 29079.597 0.830 32 5G°

6 29152.796 1.175

4/ n( 4 F°)5f? 6s2 5 29272207 1.115 38 5H°

4/ 11( 4 I°)5t/2(

1 D) ( 4G°)6s 6 29422.053 1.105 28 5G°

4/ n( 4F°)5rf 6s2 3 29460.864 1.050 26 5G°

4/ 11( 4F°)5t/6s 2

1 29469.818 0.535 25 SF°

4 29514.032 1.235 4/ 11

(4F°)5rf6s2 5 29550.807 1.150 37 5G°

4/ 12 6.s6p 6 29561.425 1.130 4/ 12

( 3F)6s6p( 3P°) 4 29594.740 1.170 35 5G°

4/ 12

( 3F)6s6p( 3 P°) 2 29596.155 0.960 37 5F°

3 29600.881 0.965

5 29794.862 1.100

4 29804.517 1.100 4/ 11

( 4I°)5c?2( 3F) ( 6M°)6s 8 29805.130 18 7M° 15 ( 4 I°)( 3 F) ( 4M°) 5M°

3 29830.664 1.020 5 29894203 1.195 4/ 12

( 3F)6s6p( 3P°) 1 29939.501 0.270 53 5 F°
328

Er I, Odd Parity—Continued

Configuration Term J

Level (cm l ) 9 Leading percentages

6 30007.369 1.090

4 30010262 1.255

4/ n( 4 r)5tf2

( 3F) (6K°)6s 6 30088200 1.120 20 7 K°

4/ n( 4F°)5d 6s2 4 30105.496 1.095 23 5H°

4/ n( 4F°)5d 6s2 3 30172.558 1.035 17 5 H°

4/ 12 6s6p 5 30251.891 1.170

4/ u( 4 r)5d2( 3 F) ( 4 F°)6s 5 30380282 1.175 28 5F°

4/ n( 4 r)5c?2( 3 F) ( 4 F°)6s 5 30600.160 1.195 42 5F°

3 30612209 1.020

4/ 12( 3F)6s6p( 3P°) 2 30618293 0.725 37 5G°

4/ n( 4F°)5o? 6s2 4 30642.798 1.100 27 5H°

4/ n(4F°)5d 6s2 5 H° 6 30765.720 1.205 52

4/ 11( 4

I

0 )5tf2

(

1 G) ( 4 D°)6s 5 D° 4 30835.494 1.375 67 19 ( 4I°)( 1 G) (4F°) 5F°

3 30913.496 1.025

4 30962.138 1.150

4/ 11

( 4 I°)5t/2

(

1 G) ( 4F°)6s 5p° 5 31105.090 1.200 59 23 ^DGG) ( 4G°) 5G°

4/ 12

( 3F)6s6p(3P°) 4 31155.754 1.145 29 5F°

4/ u( 4 I°)5</2

( 3 F) ( 6F°)6s 3 31165.859 1.175 20 7F° 16 ( 4

I°)( 1 G) ( 4 D°) 3D°

4/ n( 4F°)5rf 6s2 3 31174268 1.170 17 5 D°

5 31194235 1.135

6 31205223 1.100

4 31286.362 1.030

4 31353.006 1.125

4/ 12( 3F)6s6p(3P°) 5 31364.719 1.235 47 5G°

4/ 12( 3F)6s6p 3 31364.947 1.225

5 31442.927 1.195

4/ 11

( 4 I°)5rf2

(

1 G) ( 4G°)6s 6 31475265 1.180 33 5G°

4/ 12( 3H)6s6p 6 31823.748 1.045

4/ 11( 4 I°)5</2

(

, D) ( 4G°)6s 5 31873.185 0.990 16 3G°

6 31926.003 1.215

3 31988.938 1.065

4/ n( 4 I°)5</2

( 3 F) ( 6G°)6s 5 32062.166 20 7G°

4/ 12( 3F)6s6p(3P°) 1 32071.776 0.935 37 5D°

4/ 11( 4 I°)5(/2

(

1 G) ( 4 D°)6s 3 32114235 0.940 22 3D° 14 ( 4

I°)( 3F) ( 6H°) 7 H°

4/ 12 6s6p 4 32214-322 1.170

4/ u( 4 F°)5c? 6s2 2 32237.491 0.940 31 3F°

4/ n( 4 I°)5<f2( 3 F) ( 6H°)6s 6 32414-972 1.135 22 7 H°

4/ 11( 4 F°)5rf2

(

1 G) ( 4G°)6s 5 32590.441 1.130 31 3G°

4/ 11( 4F°)5d 6s 2 3 32695.370 0.955 39 3G°

4/ 11( 4 F°)5</6s 2 4 32702.362 1.110 18 3G°

4/ 11( 4 I°)5</2( 3F) ( 4G°)6s 6 32820.448 1.225 26 5G°

4/ 11

(4

I°)5rf2 6s 4 32828.997 1.270

4/ n( 4 I°)5d2

( 3 F) ( 2G°)6s 5 32857.856 1.210 22 3G°

5 32997.589 1.115
329

Er I, Odd Parity—Continued

Configuration Term J

Level (cm 1 ) 9 Leading percentages

4/ n(4F°)5d 6s2 4 33279.041 1.085 25 3F°

4/ n( 4F°)5<f 6s2

1 33457.460 0.905 43 3D°

4/ 11( 4F°)5rf 6s 2 5 33485216 1.040 28 3H°

2 33537.678 1.095 4/ n( 4 I°)5d2

( 3 F) ( 6K°)6s 5 33613.272 0.925 30 7 K° 17 ( 4 I°)( 3F) ( 4 I°) 5 I° 3 33845.506 1.090

4/ u( 4 F°)5d 6s2 3 H° 4 33861.463 0.945 46 3 34562.607 1.190 4/ n( 4F°)5d 6s2

1 34655.475 1.175 51 3P°

5 34684.329 1.080 3 34716.173 1.070 . 4 35024.554 1.065

4 35143.812 1.040 4/ 11

(4I°)5rf2

(3F) ( 6 L°)6s 7 L° 5 35252.065 0.950 60 3 35265.181 1.045 4/ n( 4G°)5</6s2 4 35309.683 1.145 33 5D°

8 35352.043 1.145 3 35377.563 0.995 5 35453.944 1.020 3 35585.434 1.115 5 35592.535 1.135 4/ 12

(

1 G)6s6p(3P°) 4 35601.377 1.000 27 3F°

8 35612.600 1.170 2 35620.002 0.895 4/ u( 2 K°)5d 6s 2 6 35632.524 1.110 13 3H°

6 35710.472 1.200

7 35732.619 1.095 4 35783.707 1.120 4/ 12

(

1 G)6s6p( 3P°) 3 35818.334 0.900 27 3F°

7 35858.100 1.035 5 35890.151 1.070 4 35899.449 1.160 4 35955.935 1.000 5 35956217 1.100 8 36166.714 1.115 4 36280.029 1.145 5 36287.081 1.075 4 36431.169 1.200 5 36465.938 1.135 4 36747.783 1.030 4/ 12

(

1 G)6s6p(3P°) 2 36870.622 0.805 36 3F°

4/ n( 4G°)5c? 6s 2 3 36930.659 1.010 26 5G°

5 37037.484 1.105 2 37068.166 0.840

225-298 0 - 78 - 22
330

Er I, Odd Parity—Continued

Configuration Term J

Level (cm -1

) 9 Leading percentages

4/ 11

(4I°)5d2(3F) ( 4F°)6s 3 37075.570 1.150 23 5F° 19 ( 4 I°)( 1 G) ( 4 D°) 5D°

4 37083.198 0.970 4/ 12

(

1 G)6s6p(3P°) 3 37125206 0.935 26 3F°

4 37210.947 1.140 5 37249.090

4 37265.129 1.050 3 37289.592 1.090 4 37319.434 1.035 6 37323.593 1.235 8 37361.513 1.210

5 37398.878

6 37435.116 1.265

3 37492247 1.105

5 37535.325 1.125

7 37567222 1.195

4 37582298 1.045 8 37621.885 1.155

7 37637.311 1.130 3 37649.344 0.895 6 37745276 1.070 5 37778256 1.065 4 37853.673 1.015

4 37893246 1.025 4 37970.621 1.020 4/ 11

( 4G°)5d 6s2 2 37989.003 1.120 24 5D°

5 38054.883 1.165 2 38168.987 1.086

7 38175.040 1.135

5 38175.430 1.115

4 38183254 1.110 2 38263263 1.085 8 38344-055 1.170

4 38376.825 1.190

7 38377.547 1.115

3 38397.715 0.960

2 38400.908 0.880

6 38410.587 1.120

5 38415.612 1.135

4 38487.704 1.090

8 38527.562 1.120

7 38580.582 1.045

3 38667.387 1.025

7 38724252 1.165

3 38836.476 0.970
331

Er I, Odd Parity—Continued

Configuration Term J

Level (cm -1

) 9 Leading percentages

8 38974.873 1.085

4 38982.003 1.075

7 390094104 1.030

7 39221.603 1.070

8 39225.503 1.055

3 39467.934 1.155

6 39535.919 1.150

6 39608.064 1.135

3 39688.151 1.105

7 39702.568 1.130

7 39855.032 1.210

5 40137.476 1.170

7 40149.125 1.115

4 40155.872 1.130

2 40202.083 1.100

7 40751.909 1.050

6 40859.924 1.140

8 40877.166 1.120

6 41101214 1.255

8 41382.319 1.135

7 41432.910 1.135

6 41445.371 1.050

5 41516.515 1.130

4/ u(4I°)5rf6s7s 7 41724387 1.400

4/ n( 4 I°)5c?6s7s 6 42153.614 1.225

4/ n( 4I°)5rf6s7s 8 42360.312 1.340 8 43040275 1.180

7 43056.149 1.150

9 43201.126 1.165 8 43373.966 1.160

7 43575279 1.140 8 43607.066 1.140

4/ 11( 4I°)5d

,6s7s 10 43981.088 1.220

4/ 11

( 4 I°)5d6s7s 9 44012.041 1.175

9 44217.464 1.115

7 44247.852 1.125

4/ n( 4I°)5c?6s7s 8 44270.569 1.045

4/ n( 4 I°)5rf6.s7s 10 44379.781 1.195

Er II ( 3H6)6Sl/2 (6,

1 /2)l3/2 Limit 49262
332

Er II

(Ho i sequence; 67 electrons) Z=68

Ground state (ls 2 2s 2 2p6 3s2 3p6 3d 10 4s 2 4p6 4d 10 5s2 5p6

) 4/ 12

(

:i H6 )6s (6,V2) 13/2

Ionization energy 96200± 600 cm -1 1 1.93± 0.08 eV

Identified even configurations 4/ 12 6s, 4/ 12 5d, 4/ n

6s6p, 4/ u 5d6p

Identified odd configurations 4/ n

6s 2

, 4/ n

5d6s, 4/ u 5d2 ?, 4/ 12 6p

Energy Levels, Wavelengths, g Values, Ionization Energy

McNally and Vander Sluis [1959] used the Zeeman data of Lindner and Davis [1958] in their first analysis of Er n. They identified the lowest levels as belonging to 4/ 12

(

:i H)6s and

4/ 12

(

3 F)6s terms, and found more than forty upper odd levels. The wavelengths given in Marquet’s thesis [see Er i] were adopted in the succeeding investigations of Er n by Marquet

and Davis [1965] and Vander Sluis and McNally [1970], The references to several Er line lists described in the text for Er I need not be repeated here; additional published lists for some of

the classified Er n lines are given by Vander Sluis and McNally (3172-4385 A) and Spector

(7367-11238 A) [1971a]. Vander Sluis and McNally also gave the most complete published

tables of energy levels and Zeeman data. Spector [1971b] later found the 4/ 12

(

3 H6 )5d levels as comprising two J x j-coupling terms. The levels here are from an unpublished extension of the analysis by van Kleef and Koot

[1975], which is still in progress. Many new levels of both parities have been located; about 120 even levels and 250 odd levels are now known. Most of the g values are also from van Kleef

and Koot, who give the values to the nearest 0.005 units. The g values for several of the lower even levels are averages from the measurements of Vander Sluis and McNally, Lindner and

Davis, and van Kleef and Koot; the estimated errors in the p-value determinations by Vander

Sluis and McNally for some of these levels are significantly less than 0.005 units. Sugar and Reader derived the ionization energy.

Theoretical Interpretation

The levels of the 4/ 12 6s ground configuration are paired in J lu/-coupling terms. The LS

designations of the 4/ 12 parent levels are nominal; the “real core” wavefunctions for some of

the parent levels have very mixed LS compositions [Judd and Marquet, 1962; Goldschmidt,

1963]. The lowest 4/ 12 5d levels are also grouped here into three /^'-coupling terms [Spector,

1971b; van Kleef and Koot, 1975]. Leading percentages in the LS-coupling scheme are given

for the 4/ l2 6s and 4/ 12 5d levels, the LS percentages for levels of Jij-coupling terms being

preceded by the word “or.” The percentages are from a calculation by Wyart and Koot [1975]

that included the interaction between the two configurations.

Van Kleef and Koot have established that many of the even levels above 32000 cm-1 belong to the 4/ u 6s6p and 4/ u 5d6p configurations. The assignments for the low J X J2 -coupling

terms of 4/ n 6s6p and the other assignments to these configurations are from their recent work; no calculation of the even levels in this region is yet available [van Kleef and Koot,

1975],

The discovery and identification of low odd levels belonging to the 4/ "6s2 4 I° term and to the 4/ n

( 4 I°)5d6s subconfiguration is a notable part of the analysis by van Kleef and Koot. They have also identified levels of the 4/ 12 6p configuration, which overlaps the 4/ u (5d+6s)2 group above 25000 cm-1

. The assignments of the odd levels are from their analysis. More

definite term identifications will be possible after the completion of calculations for the four

odd configurations already known; it can be anticipated, however, that the effects of

intermediate coupling and configuration interaction will result in low eigenvector purities for many of these levels.
Er II—Continued 333

References

Goldschmidt, Z. B., J. Opt. Soc. Am. 53, 594 (1963). PT

Judd, B. R., and Marquet, L. C., J. Opt. Soc. Am. 52, 504 (1962). PT

Lindner, J. W., and Davis, S. P., J. Opt. Soc. Am. 48, 542 (1958). W ZE

Marquet, L. C., and Davis, S. P., J. Opt. Soc. Am. 55, 471 (1965). EL ZE

McNally, Jr., J. R., and Vander Sluis, K. L., J. Opt. Soc. Am. 49, 200 (1959). EL ZE

Spector, N., Astrophys. J. 167, 205 (1971a). EL CL

Spector, N., J. Opt. Soc. Am. 61, 672 (1971b). EL

Spector, N., and Held, S., Astrophys. J. 167, 193 (1971). W

Sugar, J., and Reader, J., J. Opt. Soc. Am. 55, 1286 (1965). IP van Kleef, T. A. M., and Root, J. J. A., unpublished material (1975). EL ND CL ZE

Vander Sluis, K. L., and McNally, Jr., J. R., J. Opt. Soc. Am. 60, 94 (1970). EL CL ZE

Wyart, J. F., and Root, J. J. A., unpublished material (1975). PT

[May 1977]

Er II, Even Parity

Configuration Term J

Level (cm *) g Leading percentages

4/' 12

( 3H6)6si/2 (6,

1 /2) 15/2 0.000 1.230 or 99 4 H

U/2 440.434 1.101 or 67 2 H

4/ 12( 3 F4 )6si / 2 (4,77 9

/2 5132.608 1.245 or 65 4 p

72 5403.688 1.042 or 43 2F

4/ 12

( 3 Hs)6si/2 (5,!/2) n/2 7149.630 1.120 or 68 4 H

72 7195.355 0.948 or 64 4 H

4/ 12( 3 H4 )6si/ 2 (4,2) 72 10893.936 0.833 or 61 4 H

72 11042.640 1.050 or 41 2 H

4/

12

( 3 Fa)6si /2 (3,72) 72 12587.998 1.204 or 68 4p

72 12600.093 1.000 or 79 4p

4/i2(3F2)6s 1/2 (2,72) 72 13188.467 0.487 or 80 4 p

72 13558.333 0.948 or 69 2 F

4/ 12( 3 H6)5tf3/ 2 (6, 3

/2) 72 16552.871 1.315 or 83 ( 3H) 4F

15/2 18617.495 1.075 or 58 ( 3H) 2 K

11/2 18889.101 1.255 or 85 ( 3H) 4G

13

/2 20728.050 1.140 or 35 ( 3H) 4 H

4/ 12

( 3 H6 )5</5/2 (6, 5/2) 17/2 19302.832 1.175 or 99 ( 3H) 4 K

72 19903.107 1.185 or 51 ( 3H) 4 F

15

/2 21533.153 1.185 or 86 ( 3H) 4

I 11/2 21697.852 1.100 or 54 ( 3H) 2H

72 21894.055 1.165 or 41 ( 3H) 4G

13

/2 22141.355 1.145 or 42 ( 3H) 4 H

4/ 12

( 3F4 )5c?3/2 (4, 3

/2) 72 23883.022 1.105 or 22 ( 4 G) 2F

72 23962.378 1.195 or 20 ( 3F) 4 F

9

/2 24563.288 1.140 or 24 ( 3F) 4G

11/2 24745.034 1.085 or 26 ( 3F) 4G

4/ 12

( 3H)5d 72 25041.268 1.130 28 2F

4/ 12

( 3 H)5d l 3

/2 25532.352 63 4K

4/ 12( 3F)5d 11

/ 2 25586.376 1.095 38 4G

4/12

(3F)5d 9/2 26131.105 1.155 33 4p

4/ 12( 3F)5d 13

/2 26414.450 1.125 41 4H

4/ 12( 3H)5d 72 26949.099 1.060 24 4p

4/ 12

( 3H)57 11/2 27540.195 1.030 43 4

I
334

Er II, Even Parity—Continued

Configuration Term J

Level (cm 1 ) 9 Leading percentages

4/ 12( 3 H)5d 9

/2 27608.985 1.110 55 2G

4/ 12( 3H)5d 9

/2 30872.428 35 4

I

4/ 11( 4 Iis/2)6s6p( 3Po) ( 15/2,0) 15/2 32048.749 1.275

4/ 11( 4 I?5/2)6s6p( 3P!) ( 1S/2,1) 17/2 33217.200 1.195

15/2 33547.268 1.135

1S/2 33753.920 1.195

4/ U( 4 Il5/2)6s6p( 3P2) ( 15/2,2)

19

/2 36192.206 1.235

17

/2 36861.561 1.250

15/2 37321.029 1.275

13/2 37634.115 1.165 n/2 37669.560 1.160

4/ 11

( 4 I°)5rf6p? n/2 38438.391 1.350

4/ 11( 4I°)6s6p? 13

/2 38847.378 1.175 4/ n(4I°)5d6p? 13/2 39082.884 1.230

4/ n( 4 I°)5d6p? 15/2 39804.224 1.200

4/ n( 4 I°)6s6p? 1S/2 39952.447 1.055

4/ n( 4 I°)6s6p? 15/2 39994.031 1.160

4/ n(4I°)6s6p? 13

/2 40121.685 1.250

4/ n( 4 I°)5d6p? 19

/2 40447.910 1.085 4/ 11

( 4 I°)5d6p? 17

/2 40547.199 1.160 4/ 11

( 4 I°)6s6p? 1S

/2 41174.705 1.180 4/ u( 4 I°)5d6p? 17

/2 41244.400 1.140 4/ n( 4 I°)5d6p? u/2 42987.453 1.285 4/ n( 4 I°)5d6p? 13

/2 43103.357 1.305 4/ u( 4 I°)6s6p? 9

/2 43212.458 1.020 4/ n( 4 I°)5d6p? 1S

/2 43223.145 1.200 4/ n( 4 I°)6s6p? n/2 43273.539 1.060 4/11

( 4I°)6s6p? 13/2 43319.482 1.230

4/ 11

( 4 I°)5d6p? 19

/2 43413.717 1.195 4/ n( 4 I°)5d6p? 9

/

2

43460.803 1.485

15/2 43522.203 1.155 n/2 43638.448 1.215

13/2 43724.968 1.205

19

/2 43977.651 1.150

l 7

/

2

44235.276 1.170

15

/2 44263.177 1.225

l 7

/

2

44820.220 1.115

13/2 44920.406 1.160

15

/2 44955.121 1.155

17

/ 2 45285.068 1.180

l 7

/2 45471.524 1.200

11

/2 45559.568 1.170

9

/2 45900.980 1.245

13/2 46106.988 1.150

1S

/2 46260.808 1.165
335

Er II, Even Parity—Continued Er II, Even Parity—Continued

Configuration Term J

Level (cm -1

) g Configuration Term J

Level (cm -1

) g n/2 46525.882 1.195 15/2 49660.227 1.195

21/2 46560.615 1.265 13

/2 50115.664 1.150

15/2 46757.391 1.220 15/2 50246.395 1.080

19/2 46757.780 1.200 U/2 50387.772 1.160

17/2 46915.510 1.050 15/2 50451.958 1.135

13

/2 47050.810 1.220

1S/2 50457.727 1.030

15/2 47162.334 1.075

13

/2 50850.345 1.015

17/2 47174.273 1.205 15/2 51010.412 1.040

19/2 47426.638 1.215 “/2 51037.663 1.070

!5/2 47466.969 1.190 15/2 51103.871 1.100

19/2 47786.901 1.155

13

/2 51574.835 1.075

13/2 47840.962 1.125

15/2 51606.662 1.045 n/2 47847.615 1.050

13

/2 52247.929 0.980

15/2 48151.388 1.075 17/2 52392.832 1.135

13/2 48525.666 1.165

15/2 52996.133 1.130

9

/2 48607.416 1.195

l 3

/2 53891.761 1.120

1 7/2 48676.243 1.205

13

/2 54387.255 1.175

19

/2 48788.988 1.230 15/2 55316.342 1.145

13/2 49005.981 1.185

13/2 49091.098 1.035

15

/2 49378.255 1.175 Er III ( 3He) Limit 96200

Er II, Odd Parity Er II, Odd Parity

Configuration Term J

Level (cm -1

) g Configuration Term J

Level (cm -1

) g

4f n 6s2 4J° 15

/ 2 6824.774 1.200 4/ 11

( 4 I°)5d6s 11/2 17063.735 1.150

i3

/ 2 13338.777 1.120

11/2 16948.197 1.055 4/ 11

(4 I°)5d6s 13

/2 17378.917 1.135

9

/ 2 4/ n( 4 I°)5d6s 17842.682 1.140

4/ 11

(4I°)5d6s l 3

/2 10667.186 1.345 4/ n( 4 I°)5d6s ls

/2 18463J347 1.180

4/ n( 4 I°)5d6s 15/2 11309.180 1.285 4/ n( 4 I°)5rf6s 15

/2 19375.584 1.020

4/ n( 4 I°)5d6s n/2 12388.090 1.240 4/ 11

(4I°)5d6s 17/2 19606.715 1.035

4/ 11

(4I°)5d6s 19/2 12815.068 1.180 4/ n( 4 I°)5d6s 9

/ 2 19920.613 1.095

4/ n( 4 I°)5(/6s 17/2 13027.927 1.105 4/ n( 4 I°)5rf6s n/2 19992.895 1.260

4/ n( 4

I°)5rf6.s 13/2 13060.715 1.200 4/ n( 4 I°)5c?6s 13/2 20319.934 1.035

4/ u( 4 I°)5t/6.s 21/2 13572.118 1.235 4/ 11

( 4I°)5t?6s ls

/2 20517.717 1.130

4/ n( 4 I°)5d6s n/2 13719.584 1.145 4/ 11

(4I°)5d6s 13/2 21004-060 1.195

4/ ll

( 4 I°)5d6s 15/2 14280.723 1.180

4/' u( 4 I°)5rf6s 11/2 21040.001 1.130

4/ 11(4I°)5d6s 19/2 14649277 . 1.265

4/' 11

( 4 I°)5c?6s? n/2 21629.159 1.160

4/ 11

( 4 I°)5c/6.s 17/2 15732.917 1.205 4/ n( 4 I°)5rf6s? 11/2 21656.831 1.060

4/ u( 4 I°)5c?6s 9

/ 2 16241.348 1.150 4/ 11

( 4 I°)5c?2

? ”/2 21819.914 1.375

4/ n(4I°)5d6s 15/2 16473.871 1.160 4/ n( 4 I°)5t/6s? 13

/2 22120.446 1.085

4/ n( 4 I°)5d6.s n/2 16529.413 1.220 4/ n( 4I°)5rf6s? 15/2 22200.015 1.220

4/ n( 4 I°)5d6s 13/2 16643237 1.160 4/ 11

(4I°)5rf6s? 13/2 22859.510 0.920

4/ n( 4 I°)5</6s 19

/2 16935.832 1.145

11

1

23240.649 1.085
336

Er II, Odd Parity—Continued Er II, Odd Parity—Continued

Configuration Term J

Level (cm -1

) 9

Configuration Term J

Level (cm' 1 ) 9

17

/2 23539.702 1.085

9

/

2

30917.436 1.070 4f

11

(4

I

°)5d

2

?

13

/ 2 23669.096 1.285

7

/

2

31312.019 1.095

11h 23820.327 0.910 9

/

2

31381.779 1.095

i5/2 23973.877 1.220 n/2 31385.667 1.055

17

/2 2J.053.517 1.175

13

/2 31418.481 1.175

11 h 24415265 1.100 n/2 31801.102 1.135

15/2 24431.042 1.030

9

/

2

31844-124 1.170

n/2 24687.523 0.790

7

/

2

31902.682 1.100

19

/2 24708.113 1.190 u/2 32073.360 1.140

13

/2 24935.855 1.070

9

/2 32267246 1.305

11/2 25382.379 1.160

9

/2 32502.680 1.230

13

/2 32528.401 1.165

4/' 12

( 3 He)6pi/2? (6//2)

0 ? H/2 25592.343 1.200

13

/2 26098.972 1.115 11

1

2

32618.753 1.115

9

/

2

32753.468 1.200 13

1

2

25604266 1.015

7

/

2

32790.085 1.150 n/2 25971.476 1.125 n/2 32811.006 1.090 9

/

2

25996.174 1.250 n/2 26399.775 1.085 4/ 12

( 3Hs)6pi/2? (V/2)°? 9

/2 32896.371 1.220 n/2 33105.534 1.065

13

/

2

26769.141 1.165 n/2 26805.448 1.215

13/a 33012.493 1.060

9

/

2

27454.514 0.980

9

/

2

33028.394 1.105

13

/2 27513.555 1.105

9

/2 33129.912 1.195

11

1

2

27642.658 1.050

9

/2 33307.365 1.250

9

/

2

27890.690 0.950

7

/

2

33539273 0.915

!3/ 2 28082.701 1.020

9

/2 33565.895 1.100 n/2 28361.386 1.030

9

/

2

33649.964 1.030 n/2 33659.536 1.175 4/ 12

( 3 H6)bp3/2? (6, 3

/ 2 )°? 9

/

2

29011.015 1.110 n/ 2 29492.329 1.095 18/2 33674250 1.135

15/2 29640.863 1.185 n/2 33721.545 1.190

13/2 30621.102 1.170

9

/2 33804.465 1.180

13/2 29119.606 1.095 11

1

2

33988.301 1.160

7/2 29263.402 1.165 9

/2 34074.875 1.245

15

/2 29472.789 1.145 7

/

2

34148.162 1.255

lS/2 29628.405 1.165 9

/

2

34196.388 1.165

7/2 29780.571 7

/ 2 34203251 1.200

9

/

2

29783.733 1.160 n/2 34341.611 1.135

11

1

2

29858.739 1.125 9

/2 34397.143 1.150

XS/2 29892.370 1.135 13

/

2

34545248 1.140

15/2 29972.408 1.190 n/2 34563257 1.145

13/2 30008.331 1.120 9

/ 2 34674.173 1.135

9

/2 30028.618 1.050 7

/2 34902.323 1.145

11

1

2

30122.939 1.125 n/2 34972.437 1.155

7

/

2

30130.762 1.090 9

/ 2 35063.892 1.170 n/2 30157.742 1.070 n/2 35215.487 1.150

4/ 12( 3F4)6pi/2? (4,V2)°? 9

/ 2 30317.974 1.130 i 3

/ 2 35276.531 1.180

7

/ 2 30894-447 1.265
337

Er II, Odd Parity—Continued Er II, Odd Parity—Continued

Configuration Term J

Level (cm -1

) 9

Configuration Term J

Level (cm -1

) 9

7

/

35359.885 1.195 n/2 38642.554 1.140

ll/2 35617.906 1.150 7

/ 2 38651.814 1.030

13/2 35671.599 1.190 9

/2 38847.186 1.090

7

/2 35819.939 1.185 7/

39021.546 1.060

9

/2 35877.083 1.155 5/2 39036.642 1.155

11

/ 2 35885232 0.975 7/2 39053.063 0.980

®/2 35899232 1.050 7

/

39140.561 1.180

7

/

35927.60k 0.915 11/2 39242.082 1.095

9

/

36007.182 1.020 7

/

39277.605 1.215 n/2 36147.709 1.155 7/2 39304-952 1.025

9

/

36322233 1.075 9

/

39392224 1.095

3

/2 36k6k-008 1.070 5

/

39447.909 0.945

7

/

36k70.9kk 0.800 9

/

39509.332 1.245

7

/

36k71.98k 1.105 u/2 39525.696 1.125 n/2 36643232 1.095 5

/39643.159 1.175

7

/

36738247 1.080 9

/

39653.816 1.085

9

/

36761.150 1.000 U/2 39766.447 1.105

7

/

36825.194 1.160 3

/39833.544 0.920 n/2 36863.932 1.055 9

/39845276 1.080

5

/ 2 36932273 1.495 7

/39975.403 1.035

9

/2 37038.764 1.145 9

/ 2 40000.774 1.115

7

/ 2 37057.724 1.150 5

/2 40123.804 0.790

11 12 37098.956 1.250 II /2 40124.080 1.070

9

/ 2 37110.402 1.065 9

/2 40303.477 1.105

5

/2 37126.953 1.205 S

/2 40368.926 0.700 ”/2 37146.674 1.150 n/2 40435.615 1.115

3

/

37357.383 0.755 9

/ 2 40497.076 1.055

9

/2 37438.656 1.060 5

/2 40642.960 1.110

9

/

37483.090 1.175 3

/

40687.445 1.060

7

/

37527.159 1.150 5

/2 40723.759 1.060

9

/

37617.073 0.920 7

/

40747.134 1.015

7

/

37698.823 1.115 n/2 40756.773 1.045

5

/2 37712.008 1.245 9

/ 2 40853.950 1.000

9

/

37736.569 1.020 9

/40905.867 0.955

7

/

37747.938 0.915 7

/

40943.527 1.045

9

/

37959.624 1.115 9

/2 40959.837 1.045

5

/2 38204.486 0.990 3

/41003.728 1.340 n/2 38310.987 1.075 5/2 41013.774 0.960

7

/

38318204 0.925 7

/41029.308 1.145

9

/

38363.814 1.075 9

/ 2 41067.403 1.065

3

/

38470.551 1.380 9

/ 2 41170.514 0.950

9

/

38477.809 1.110 7/2 41206.903 0.965

5

/2 38580.914 0.935 9

/41268.620 0.975

S

/2 38617.345 0.990 11

/ 2 41415.615 1.070
338

Er II, Odd Parity—Continued Er II, Odd Parity—Continued

Configuration Term J

Level (em _1

) 9 Configuration Term J

Level (cm -1

) 9

9h J+l 486.824 1.170 3

/2 42862.753 0.920

7/2 41505.714 1.045 S/2 43161.997 1.020

9

/

2

41617.792 1.075 9

/2 43221.660 1.060

5/2 41682.421 0.990 7

/

2

43302.725 1.120

7

/2 41876.127 1.030 5

/2 43553.435 1.035

5

/2 42064-826 1.105 7

/

2

43925.092 1.185

7

/

2

42149.596 0.955 3

/

2

43929.434 0.810

5/2 42177.581 1.040 7/2 43939.914 1.225

5

/2 42264.318 1.125 7

/

2

44148.073 1.065

7

/

2

42414.845 1.040 3/2 44162.153 0.770

7

/

2

42461.068 1.000 3/

2

44848.559 1.095

7

/

2

42527.318 1.020 7/

2

45011.044 0.990

7

/

2

42626.606 1.100

3

/

2

42650.795 0.845 Er III ( 3He) Limit 96200

5/2 42747.673 0.935

7

/

2

42769.495 1.135
339

Er III

(Dy i sequence; 66 electrons)

Ground state (ls 2 2s 2 2p 6 3s 2 3p6 3d'°4s 2 4pfi 4d 10 5s 2 5pfi ) 4/ 12 ! Hfi

Ionization energy 183400± 800 cm 1

Identified even configurations 4/ 12 and 4/ n 6p

Identified odd configurations 4/ u6s and 4/ H 5d

Becher [1965] began the analysis of this spectrum by finding nine levels belonging to the

4/ 1I (

4 I°5/2 )5d, 4/ ll (

4 I°5/2 )6s, and 4/ n

(

4 Ii5/ 2 )6p groups. He noted the J x j coupling in these

subconfigurations, and assigned levels to all five J x j terms based on the 4/ u(

4 I°5/2) parent

level.Most of the levels and term assignments given here are from Spector [1973]. He

independently found a more extensive system of excited levels and located them relative to three levels of the 4/ 12 ground configuration, including the ground level. Wyart, Blaise, and

Camus [1974] in their study of (4f

N 5d+4f N 6s) configurations calculated this group for Er ill (N=ll). They added two levels and suggested the deletion of two other levels from Spector’s

list. The leading percentages in LS coupling are taken from their paper. Three levels of this group could not be unambiguously assigned to calculated eigenvectors.

Wyart, Root, and van Kleef [1974] calculated the percentages in J x j coupling for the

4/ u

( 4 I°)6p group of levels. These authors also located an additional experimental level of this group and found two new levels of 4/ u

(

4 I°)5d. Van Kleef [1975] has supplied three

unpublished levels, including the 4/ 12 3 H4 level to complete the ground term.

Spector’s published line list gives about 150 classified lines in the range 2165-5903 A. He

states that his complete list included 800 Er in lines. Becher’s thesis has some 3800 lines believed to belong to Er in and Er n, with wavelengths from 2036 A to 8725 A. Sugar and Reader obtained the quoted ionization potential.

Z-68

22.74± 0.10 eV

References

Becher, J., Thesis, Johns Hopkins Univ., 134 pp. (1966). EL CL W PT

Spector, N, J. Opt. Soc. Am. 63, 358 (1973). EL CL W PT

Sugar, J., and Reader, J., J. Chem. Phys. 59, 2083 (1973). IP

van Kleef, Th. A. M., private communication (1975). EL

Wyart, J. F., Blaise, J., and Camus, P., Phys. Scr. 9, 325 (1974). EL PT

Wyart, J. F., Root, J. J. A., and van Kleef, Th. A. M., Physica (Utrecht) 77, 159 (1974). EL PT

[October 1976]

Er III

Configuration Term J

Level (cm -1

) Leading percentages

4/12 3 H 6 0.00 5 6969.78

4 10785.48

4/ 12 3 F 4 5081.79 3

2

4/11

(4 Il5/2)5d3/2 ( 15

/2,3/ 2

)° 6 16976.09 or 76 ( 4 I°) 5G°

7 17647.76 or 79 ( 4 I°) 5 H°

9 18976.74 or 47 ( 4 I°) 3 L°

8 19918.17 or 40 ( 4 I°) 5 I°
Er III —Continued

Configuration Term J

Level (cm -1

) Leading percentages

4/ XX

( 4 Il5/2)6Sl/2 ( 1S /2//2)° 8 19315.90 or 97 (41°) SI° 7 2022620 or 70 ( 4 I°) 3 I°

4/11( 4

1 15/ 2 ) 5^5/2 ( 15

/2,5 /2)° 10 201,70.13 or 96 (4 I°) 5 L°

9 21688.17 or 74 (41°) 5 K

° 5 22016.77 or 62 ( 4 I°) 5G°

6 22606.07 or 51 ( 4 I°) 5 H

° 8 22951.1,2 or 48 ( 4 I°) 5 I° 7 23302.78 or 34 ( 4 I°) 3 I° 4/U(4 Il3/2)5d3/2 ( 13

/2,3

/ 2

)° 8 251,82.12 or 51 ( 4 I°) 5 L

° 5 26192.66 or 50 ( 4 I°) 3G

° 7 26579.91 or 38 ( 4 P) 5 K°

6 or 24 ( 4 I°) 5 K°

4/ 11

( 4 Il3/2)6sl/2 ( 13

/2,

1 /2)° 7 26102.80 or 71 ( 4 I°) 5 F

6 261,11.80 or 55

4/11 5d 6 271,72.1,2 35 ( 4 I°) 3 H°

4/11 5d 5 27870.82 31 (4 I°) 5G°

4/ 11 5d 8 28555.1,2 57 ( 4 I°) 5 K

°

4/11 5d 6 28777.67 24 ( 4 I°) 3 H°

4/11 5d 7 28818.3

A

41 ( 4 I°) 5 L°

6 29610.92

5 29806.1,9

4/ 11 5d 5 30011,126 24 ( 4 I°) 5 I°

4 32198.86

4/xx 5d 6 33875.16 21 ( 4 I°) 3 I°

4/ X1( 4 Il5/2)6pi/2 ( 15

/2,

X /2) 7 55547.26 95 8 56025.35 97

4/ 11

( 4 I?5/2)6P3/2 ( 15/2,3/2) 9 61032.47 97 6 61493.77 70 8 61539.16 97 7 61699.32 82

4/ n( 4 I?3/2)6pi/2 ( 13

/2,

1 /2) 6 62598.12 71 7 62607.86 84

4/ ll( 4 I?l/2)6pi/2 ( 11

/2,

1 /2) 5 65934.66 78 6 66077.65 80

4/ 11

( 4 Il3/2)6p3/2 ( 13

/2,3

/2) 8 67699.17 99 5 67986.43 89

7 68084.75 98 6 68186.17 94

4/ ll( 4 Ill/2)6p3/2 ( X1

/2,3

/2) 4 71348.40 71 7 82 5 71779.46 76 6 71785.85 80

Er iv ( 4

1 15/ 2 ) Limit 1831,00
341

[Er IV]

(Tb i sequence; 65 electrons) Z= 68

Ground state (ls 2 2s 2 2p6 3s 2 3p6 3d 10 4s 2 4p6 4d'°5s 2 5pfi ) 4f

u 4 I°5/2

Ionization energy 344000± 3000 cm' 1 42. 7± 0.4 eV

Carter’s thesis [1966] has a list of about 1200 lines assigned to Er IV from 1225 to 5609 A,

but only lines regarded as classified in the analysis were included. Unfortunately, the 4/ n —

4/ 10 5d transition array given by Carter proved inconsistent with the energy separation

derived later from the systematic behavior of such configurations in the rare earths [Sugar

and Reader, 1973]. Carter’s analysis also included a number of 4/ 10 6s-4/ i0 6p transitions. We

have not given any of the levels, pending further work on the free-ion spectrum.

The levels of the three 4/ 11 terms here were derived from the spectrum of Er:,+ in LaCl3 [Dieke, 1968]. The positions are the mean values of the corresponding sublevels, rounded off to the nearest 10 cm' 1

. Carnall, Fields, and Rajnak [1974] supplied the eigenvector percentages

from their unpublished calculations. Dieke gives the 4/ 11 energy structure of this ion in several

other crystals, and lists additional levels up to 34000 cm'1

. Sugar and Reader derived the ionization energy. The uncertainty has been approximately

doubled, in accordance with the suggestion by Spector and Sugar [1976].

References

Carnall, W. T., Fields, P. R., and Rajnak, K., J. Chem. Phys. 49, 4424 (1968). [EL]

Carnall, W. T., Fields, P. R., and Rajnak, K., unpublished material (1974). PT

Carter, W. J., Thesis, Johns Hopkins Univ., Baltimore, 65 pp. (1966). EL CL W PT

Dieke, G. H., Spectra and Energy Levels of Rare Earth Ions in Crystals, Ed. H. M. Crosswhite and H. Crosswhite, pp. 294-309 (Interscience Publishers, New York, 1968). [EL] ND [CL] [W]

Spector, N., and Sugar, J., J. Opt. Soc. Am. 66, 436 (1976). Sugar, J., and Reader, J., J. Chem. Phys. 59, 2083 (1973). IP Wybourne, B. G., J. Chem. Phys. 34, 279 (1961). PT

[March 1977]

[Er iv]

Configuration Term J

Level

(cm~‘) Leading percentages

4/n 4 J° 15

/2 0 97 3

2 K°

13

/

\6W

]

99 1 2K°

U/2 [10110] 82 15 2 H°2

9

/[12350] 51 17 2 H°2

4/u 4 F° 9

/

[15180] 58 28 4J°

7

/2 [2OI4.OO] 92 5

2G°1

5/2 [22070] 85 13 2D°1

3

/2 [22410] 63 20 2 D°1

4/n 4 g° 3

/[18290] 68 18 2p°

Er v ( 5 Is) Limit 344000
THULIUM

Tm I

69 electrons Z=69

Ground state (ls 2 2s 2 2p6 3s 2 3p6 3d 10 4s 2 4p6 4d 10 5s 2 5pfi ) 4/ 13 6s 2 2 F°/2

Ionization energy 49879.8± 0.5 cm 1 6.18436± 0.00006 eV

Identified odd configurations 4/ 13 6s 2

, 4/ 13 5d6s, 4/ 12 6s 2 6p, 4/ 12 5d6s6p, 4/ 13 6s7s,

4/ 13 6s6d, 4/ 13 6s8s, 4/ 13 6p2

Identified even configurations 4/ 12 5d6s 2

, 4/ 13 6s6p-8p, 4/ 13 6sl7p-48p, 4/ 13 5d6p

Meggers’ start on this analysis in 1942 gave the interval between the levels of the

4/ 13 6s 2 “F° ground term, along with 16 upper even levels. In 1963 Blaise and his collaborators

published extensions of the analysis, and by 1965 Camus, Blaise, and others had obtained

Zeeman and infrared wavelength data that allowed a further extension of both the odd and even level systems and gave J and g values for nearly all known levels. The 4/ 12 5d6s2 and

4/ 13 6s6p even configurations and the 4/ 12 6s 2 6p and 4/ 13 5d6s odd configurations were

interpreted theoretically, and the 4/ 13 6s7s and 4/ 13 6s8s series had been identified. The paper by Sugar, Meggers, and Camus [1973] included additional levels belonging to the above configurations, and many new levels assigned to the 4/ 13 5d6p, 4/ 12 5d6s6p, 4/ 13 6s6d,

and 4/ 13 6p2 configurations. This collaboration of the Laboratoire Aime Cotton and the National

Bureau of Standards was based in part on new measurements of the spectrum made at NBS.

The list of about 4400 emission lines (2500-11750 A) includes more than 2700 classified lines. Practically all of the energy levels below 46000 cm 1 are taken from this paper, which included

a total of almost 500 levels. The level values were obtained by least-squares adjustment to the

measured lines; “for levels given to three decimal places the standard deviation varies from

0.004 to 0.010 cm"1 [and] for those given to two it varies from 0.010 to 0.02 cm'1 .”

g Values

Most of the g values are from Camus’ thesis [1971], and are based on Zeeman-effect plates

obtained by Tomkins and Fred at the Argonne National Laboratory. A few revisions have

been supplied by Camus and Wyart [1976]. The line list of Sugar, Meggers, and Camus

includes the Zeeman-effect measurements for the lines. The g value for the ground level is from the atomic-beam magnetic-resonance measurement by Giglberger and Penselin, who gave

this quantity as 1.141 189±0.000003. Budick and Simievic obtained the quoted g values for two

of the 4/ 13

( 2 F°/2 )6s6p( 3 P°) levels, J- 1k and %, with respective uncertainties of 0.00006 and

0.00010. The g value for the even level at 21121 cm 1 is given with an uncertainty of ±0.00003

by Steudel, Wallenstein, and Walther. Steudel et al. also measured the quoted four-place g

values with uncertainties between 0.0005 and 0.0012.

Theoretical Interpretation, Calculations

All leading percentages are taken from Camus’ thesis [1971]. The interpretation of the

levels of both parities is complete up to above 30000 cm' 1

, with most of the configurations

being given in a Jl j or J X J2 coupling scheme. In order to shorten the notations for second

percentages from configurations coupled in those schemes, we have omitted the final (J x ,j) or

( J X ,J2 ) term symbols wherever they would be redundant. Leading percentages for the
T'm i —Continued 343

4/ 13 6s6d levels are given in both the preferred J X L2 scheme and in a JX J2 scheme (following

the word “or”), the final (J X ,J2 ) term symbols being omitted in this case also. The complexity of the spectrum is now known to arise mainly from configurations based

on the 4/ 12 core; for example, the bulk of the 284 known odd levels belong to the 4/ 12 5d6s6p

configuration. The average purity of 356 levels of 4/ 12 5d6s6p calculated in an LS scheme was

only 16% [Camus, 1971], The scheme preferred by Camus for this configuration is an

“intermediate” J X J2 coupling scheme illustrated by the lowest term, 4/ 12

(

:! H6 )5d6s6pCF 2/2 ), beginning at 29309 cm -1

. (The scheme is intermediate in the sense that the two 5d6s6p parent

doublet terms of each type ( 2 F°, 2 D°, 2 P°) are mixtures of corresponding terms having pure

parentages within the 5d6s6p group; for example, 5d( 2 D)6s6p( 3 P°) ( 2 F°, 2 D°, 2 P°) and

5d( 2 D)6s6p('P°) ( 2 F°, 2 D°, 2 P°) would be obtained in a pure coupling scheme based on vanishing

5d-6s and 5d-6p interactions.) For technical reasons, Camus transformed the 4/ 12 5d6s6p

eigenvectors to the intermediate J X J2 scheme only for Js= 15

/2 . We have thus given the leading

percentages in the J X J2 scheme for levels having Js* 15

/

if J2 (in the leading J X J2 component)

belongs to a 5d6s6p quartet level. The J X J2 names for a few levels (Js= 15/2 ) based on 5c?6s6p

doublet levels are given, but without percentages; these levels have leading percentages >50%

in the intermediate J X J2 scheme. In some cases we include tentative guesses as to the most

appropriate parentages for the doublets in a corresponding pure coupling scheme; for example,

4/ 12

( 3 H6 ) 5d( 2 D)6s6p( 3 P°?) ( 2 D°,/2 ). Camus was able to assign J X J2 designations to some levels with J< 15

/2 , and these are listed for several such levels belonging to low J X J2 terms. Pending a more complete calculation and transformation to J X J2 coupling, only the configuration

assignment is given for many of the 4/ 12 5d6s6p levels. None of the even levels have been assigned to a configuration as complex as 4/ 12 5d6s6p,

but Sugar, Meggers, and Camus note that many of the unidentified even levels (which begin

above 35000 cm ') probably belong to the as yet unlocated configuration 4/ 12 5d2 6s. Camus and

Wyart [1976] have kindly supplied a few additional levels and revised assignments for the even group.

Absorption and Photoionization Spectra, Ionization Energy

Camus [1971] observed the absorption spectrum of thulium vapor over the region 2000-

2750 A. He noted that at the low temperature used (1200 °C), only transitions from the 2 F°/2 ground level would be expected. Some even levels based on this work begin at 37557 cm-1

, and

the long 4/ 13

(

2 F°/2 )6snp series were observed in absorption. The assignments from 17p through

20p are given as tentative because of the density of the spectrum in this region and possible

ambiguities in the J values of particular levels within the terms. The absorption spectrum in the range 45500-49500 cm^1 is largely uninterpreted; Camus states that configurations of the

type 4/ 12 6s 2 nd and (through configuration interaction) Af 12 5d6sms probably account for many

of the lines. The positions of the photoionization resonances observed by Parr are followed by the

letter “a” (autoionization). A number of the high 4/'3

( 2 F°/2 )6s ( 7

/2 ,V2 ) 2 np series members

observed by Camus apparently are superimposed on the lowest of the broad photoionization resonances, at 49975 cm

-1

. Parr’s tentative assignments of a few of the autoionizing levels to terms of Af l3 5dnp configurations are omitted, pending a more detailed theoretical treatment of

this complex spectrum above the limit. Camus [1971] determined the quoted value for the ionization energy by fitting the

4/ 13( 2 F°/2 )6s (% ,¥2 ) 2 np3l2 series (17=£rcs£48). Parr’s value of 6.180±0.008 eV, determined

directly from the threshold for photoionization, agrees well with the more accurate

spectroscopic value.

References

Allen, L., United Kingdom Atomic Energy Research Establishment AERE-R 4029, 34 pp. (1962). W ZE

Blaise, J., and Vetter, R., C. R. Acad. Sci. 256, 630 (1963). EL Hfs IP

Blaise, J., and Camus, P., C. R. Acad. Sci. 260, 4693 (1965). EL ZE

Bordarier, Y., Vetter, R., and Blaise, J., J. Phys. (Paris) 24, 1107 (1963). EL CL W Hfs

Bovey, L. F. H., and Garton, W. R. S., Proc. Phys. Soc. London, Sect. A 67, 476 (1954). W

Budick, B., and Simievic, A., Spectroscopic and Group Theoretical Methods in Physics, Ed. F. Bloch et al., pp. 161-165

(John Wiley & Sons, N.Y., 1968). ZE Hfs
344 Tm I—Continued

Camus, P., J. Phys. (Paris) 27, 717 (1966). EL ZE PT

Camus, P., J. Phys. (Paris) 31, 985 (1970). PT

Camus, P., Thesis, Univ. Paris, Orsay, 265 pp. (1971). EL ND CL W ZE IP SF PT

Camus, P., J. Phys. (Paris) 33, 203 (1972). EL ND ZE PT

Camus, P., and Blaise, J., C. R. Acad. Sci. 261, 4359 (1965). EL ZE IP Camus, P., Guelachvili, G., and Verges, J., Spectrochim. Acta, Part B 24, 373 (1969). EL CL W ZE Hfs Camus, P., and Wyart, J. F., unpublished material (1976). EL ND ZE

Giglberger, D., and Penselin, S., Z. Phys. 199, 244 (1967). ZE Hfs

King, A. S., Astrophys. J. 94, 226 (1941). Temperature Classification Meggers, W. F., Rev. Mod. Phys. 14, 96 (1942). EL CL

Parr, A. C., J. Chem. Phys. 54, 3161 (1971). EL CL W IP

Ritter, G. J., Phys. Rev. 128, 2238 (1962). ZE Hfs

Steudel, A., Wallenstein, R., and Walther, H., Phys. Lett. A 31, 433 (1970). ZE

Sugar, J., Meggers, W. F., and Camus, P., J. Res. Nat. Bur. Stand. (U.S.) 77A, 1 (1973). EL CL W ZE IP

[October 1976]

Tm I, Odd Parity

Configuration Term j

Level (cm -1

) 9 Leading percentages

4/-13(2F°)6s2 2p° 7/2 0.000 1.14119

5

/2 8771.243 0.855

4/ 13( 2F?/2 )5d6s(3D) 3[3

/ 2

]° 5/2 20406.840 1.58 97 1 ( 2 F?/2 )( 3 D) 3

[ 5

/ 2

]° 3

/ 2 21799.380 1.45 72 22 ( 2 F?/2)(

1 D) 1 [ 3

/ 2

]°

1

/2 24160.63 1.010 93 4 ( 2F§/2)0D) V/2]

0

4/

13

( 2 F7/ 2 ) 5d6s( 3D) 3

[ U/2

]° 9

/ 2 22419.764 0.934 98 2 ( 2F?/2 )( 3D) 3

[ 9

/ 2

]° ll/2 22559.502 1.15 79 19 4/

13

( a Hs)6s

2 6/?i/2 13

/ 2 227J42.777 1.198 90 10 4/ 12

( 3 He)6s2 6/>i/ 2

4/ 12( 3He)6s2 6pi/2 ( 6,V2 )° ll/2 22468.046 1.21 74 18 4/

13

( 2F7/ 2 )5d6s( 3 D) 3

[ n/2 ] 13

/

2

22902.127 1.138 88 10

4/

13

( 2Ff/2) 5d6s( 3D) 3[ 5

/ 2

]° ? /2 23335.111 1.362 79 20 ( 2F?/2 )( 3D) 3

[ 7

/ 2

]°

5 /2 23431.844 1.22 82 16 ( 2F7/2 )( 3 D) 3

[ 7

/ 2

]° 3

/

2

23574-415 0.83 94 5 ( 2 F7/2 )( 3 D) 3

[ 3

/ 2

]°

4/ 13

( 2F7/2 )5c/6s( 3D) 3[7/ 2

]° 9

/ 2 23941.071 1.29 82 16 ( 2 F?/2)(3 D) 3

[ 9

/2

]° 5/2 24611.303 0.92 77 16 ( 2 F7/2)( 3 D) 3

[ s

/2 ]° 7

/

2

24708.041 1.08 49 42 ( 2F7/2)( 3D) 3

[ 9

/2

]°

4/

13

( 2 F7/ 2 ) 5d6s( 3D) 3[ 9

/ 2

]° 7

/ 2 24246.425 1.02 55 31 ( 2 F7/2)(3 D) 3

[ 7

/ 2

]° 9

/ 2 24701.058 1.145 75 17 ( 2 F7/2)(3D) 3

[ 7

/ 2

]°

1 1/2 24957.469 1.235 75 19 ( 2F?/2)(

1 D) V'hY

4/

13

( 2F7/ 2 ) 5d6s( 1 D) VhT 3

/2 25207.732 1.365 72 16 ( 2 F?/2)( 3D) 3

[ 3

/ 2

]°

4/

13

( 2F7/ 2 ) 5d6s( 1 D) V'hT 11

/2 25520.987 1.10 78 18 ( 2 F?/2 )(3D) 3

[ 9

/ 2

]°

4/ 12( 3 He)6s2 6pa/2 (6,3/2)° 1S

/2 25536.116 1.20 99 1 Ole) (6,

3

/ 2

)°

9

/ 2 25699.714 1.12 88 5 4/ 13

( 2F!/2)5c/6s( 3D) 3[ 9

/ 2

]° 13/2 26357.736 1.188 98 1 ( J Ie) (6,

3

/ 2

)° U/2 26368.412 1.125 91 3 ( 3 He) (6,V»)°

4/ 13

( 2F?/2)5d6s( 1 D) l [*l*]°

5

/2 26448.274 1.14 93 6 ( 2 F?/2)( 3 D) 3

[ 7

/ 2

]°

4/

13

( 2F7/ 2 ) 5d6s( 1 D) VhT

7

/2 27037.468 1.11 97 1 ( 2 F!/2)( 3D) 3

[ 5

/ 2 ]°

4/ 13( 2F?/2 )5d6s( 1 D) 1[ 9

/2

]° 9

/2 27440.858 95 2 ( 2 F?/2)( 3 D) 3

[ 9

/ 2 ]°

4/ 12

( 3F4)6s2 6pi/2 (4,V2)°

7

/ 2 28340.29 62 29 ( 1 G4 ) (4,V»)

0

9

/ 2 28514.423 1.085 60 28

4/

12

( 3H6) 5d6s6p(

4F§/2) (6,

3

/2 )° 9

/

2

29308.69 1.49 U/2 31080.846 1.37

1S

/2 32112.98 0.98 80

13

/2 32950.10 1.31

4/ 13

( 2F§/2 )5d6s(3D) 3

[ 9

/2

]° 7

/2 30921.58 0.69 98 1 ( 2F7/2)( 3 D) 3

[ 9

/ 2

]° 9

/ 2 31388.303 0.98 88 3 ( 2FI/2)(

1 D) 1

[ 9

/ 2

]° 1X /2 32107.268 1.115 99
345

Tm I, Odd Parity-^-Continued

Configuration Term J

Level (cm -1

) 9 Leading percentages

4/ 12( 3 Hs)6s2 6pi/2 (5,V2)°

9

/

30947.175 88 4 4/ 13

( 2 F§/2 )5c/6s( 3D) 3

[ 9

/ 2

]° “/2 31007.60 1.00 96 1 ( 3 F4 ) (4,

3

/ 2

)°

4/ 12

( 3 H6 )5(f6s6yo( 4 F5/2) (6,

5/2)° 7

/

31367.728 1.33

9

/2 32451.714 1.25

17

/2 32761.55 1.11 80 n/2 33793.155 1.24

15/ 2 34046.54 1.18 46

1S/2 34449.774 1.18

4/ 12

( 3 F4)6s2 6p3/2 (4,

3 /2)° 9

/ 2 31454.298 58 26 0G4) (4,

3

/ 2

)° 11/2 31519.495 60 29

5

/

31593.70 58 31

7

/

31694.749 1.17 62 28

4/ 13( 2 F§/2 )5ri6s( 3D) 3/2 31499.06 1.33 46 3[ 3

/ 2

]° 44 ( 2 FI/2 )( 3 D) 3[V2]°

4/ 13( 2 F§/2 )5tf6s( 3D) 3

[ 3

/ 2

]° 5

/2 31773.78 1.23 85 13 ( 2Fi/2)(3 D) 3

[ 5

/ 2

]° V2 92 8 ( 2F§/2)(

1 D) HVa]

0

3

/2 32780.05 1.05 48 24 ( 2Fs/2 )( 3 D) 3 [V2

]°

4/ 13( 2 F§/2)5rf6s( 3D) 3

[ 5/2]° 3

/ 2 32181.59 0.725 71 17 ( 2 f§/2 )( 3 D) 3 [v2 ]°

5 /2 32856.613 1.051 83 13 ( 2 FS/2 )( 3 D) 3

[ 3

/ 2

]°

7

/

33240.362 1.17 73 23 ( 2 Fi/2 )( 3 D) 3

[ 7

/ 2

]°

4/ 13

( 2 F7/2)6s7s(3 Si) ( 7 /2,l)° 9/2 32217.195 1.333

? /2 32359.372 1.195

5

/

32479.326 0.89

4/ 13( 2F§/2)5c?6s(3 D) 3

[ 7

/ 2

]° S

/2 33292.78 0.624 97 2 ( 2FI/2 )( 3 D) 3[ s

/ 2

]°

7

/

33395.984 49 24 4/ 12

( 3 H5 )6s2 6p3/ 2 9

/

33726.70 1.14 86 8 ( 2 FI/2)( 1 D) »[ 9

/ 2

]°

4/ 12 5(f6s6p n/2 33638.74 1.42

4/ 12

( 3 He)5<76s6p( 4 F7/2) (6,

7

/2 )° 19/2 33644.74 1.18

4/ 12( 3 Hs)6s2 6p3/2 (5,3/2)° 7 /2 33778.36 68 25 4/ 13( 2 F§/2)5t/6s( 3 D) 3

[ 7

/ 2

]° 18/2 33943.282 1.13 100

9

/

34310.330 0.995 50 46 4/ 13

( 2 F§/2 )5(/6s( 1 D) H

9^]

0

11/2 34532.898 1.126 99 1 ( 3 H5 ) (5,

1 /2)°

4/ 12 5c/6s6p 13

/2 33812.149 1.15

4/ 13

( 2 F7/2)6s7s( 1 So) ( 7/2,0)° 7/2 33961.044 1.15

4/ 13

( 2FS/2)5c/6s( 1 D) ‘OT V2 34069.26 0.666 83 7 ( 2FI/2)( 3 D) 3

[ 3

/ 2

]°

4/ 12 5d6s6p 5

/2 34194-09 1.24

4/ 12 5d6s6p 7

/2 34365.624 1.205

4/ 12 5c/6,s6p 9

/2 34457.853 1.185

4/ 12

( 3 H5)6s2 6

JD3/2 9

/2 34587.982 1.00 43 (5 3

/ 2

)° 42 4/ 13

( 2F§/2 )5f/6s( 1 D) »[ 9

/ 2

]°

4/ 12 5c/6.s6p u/2 34691.802 1.16

4/ 13( 2FS/2 )5(/6s( 1 D) 1

[ 3

/ 2]

0 3

/

34999.008 0.897 96 2 ( 2 FS/2)( 3 D) 3

[ s

/ 2

]°

4/ 12 5d6s6p 9

/

35055-681 1.28

4/ 12( 3 H4 )6s2 6pi/2 (4,V2)° 9

/

35363.77 0.91 58 26 ( 3F4) (4,

1

/ 2 )° 7

/

35389.94 0.965 56 26

4/ 12( 3 H6)5cf6s6p( 4 DI/2) 15

/2 35557.70 1.255 35 (6, 3

/ 2

)°

4/ 12( 3He) 5tf( 2D)6s6p( 3P°?) ( 2 D!/2) (6,

s/2)° 17

/2 35633.01 1.18

4/ 13( 2F§/2 )5cf6s( 1 D) H'/a]

0 5

/2 35673.62 97 2 ( 2 FI/2 )( 3 D) 3

[ s

/ 2

]°

4/ 12 5c/6.s6p 7/

35682.251 1.222

225-298 0 - 78 - 23
346

Tm I, Odd Parity—Continued

Configuration Term J

Level (cm' 1 ) 9 Leading percentages

4/ 12 5d6s6p XS/2 35958.880 1.134

4/ 12

( 3 H6 )5(/6s6p(4 D§/2) (6,

5 /2)° 15/2 36179.60 1.155 47

4f

12 5d6s6p 13/2 36223.628 1.12

4/ 12( 3 He)5</6s6p( 4F7/2 ) 15

/2 36273.94 1.13 29 (6,

7 /2)°

4/ 12 5d6s6p “/2 36329.786 1.035

4/ 12 5<76.s6p

9

/2 36377.733 1.21

4/ 13

( 2FI/2)5c/6s( 1 D) X

[ 7/2]

0 7/2 36435.78

4/ 12

( 3 He) 5c/( 2 D)6s6p(3P°?) ( 2 D3/2) (6,

3

/ 2

)° 15/2 36653.924 1.13

4/ 12 5d6s6p 1J /2 36656.724 1.16

4/ 12 5d6s6p

7

/

2

36934.216 1.285

4/ 12 5d6s6p 9

/

2

37010.534 1.11

4f 12 5d6s6p 15/2 37159.51 1.225

4/ 12( 3F3)6s2 6pi/2 (3,

1

/ 2)° S

/2 82 6 ( 3 F2 ) ( 2//2)

0

7

/

2

37221.455 96 3 ( 3 H5) (5,

3

/ 2

)°

4/ 12( 3 He)5(/6s6p(4 D7/2) 17

/2 37252.03 1.20 27 (6,

7

/ 2 )°

4/ 12 5d6s6p 1 1/2 37276.778 1.25

4/ 12 5d6s6p 13/2 37365.13 1.20

4/ 12 5d6s6p 7

/2 37519.484 1.09

4

f

12 5f/6.s6p 1S/2 37646.186 1.175

4/ 12 5f/6.s6p H/2 37657.928 1.01

4/ 12 5tf6s6p 9

/

2

37768.662 1.215

4/ 12( 3He)5(f6s6p( 4 D7/2) (6,

7

/2 )° 15/2 37858.62 1.20 53

4/ 12 5c/6s6p l 3

/

2

38012.795 1.09

4/ 12 5d6s6p 11/2 381 61 .255 1.125

4/ 12 5(/6s6p 7

/2 38211.625 1.175

4/ 12

( 3 H4)6s2 6p3/2 (4,3

/2)° 11/2 38347.875 1.07 59 28 ( 3 F4 ) (4,

3

/2

)°

5

/ 2 41 25 ( 3 F2 ) (2,i/ 2

)°

7

/

2

38664.184 1.042 57 26 ( 3 F4 ) (4, 3/ 2

)° 9

/2 38685.555 1.043 57 25 ( 3 F4 ) (4

,

3

/ 2

)°

4/ 12 5</6s6p 9

/ 2 38384.926 1.134

4/ 12 5c/6s6p 7

/ 2 38482.584 1.25

4/ 12( 3He)5(/6s6p(4 FI/2) (6,

9/2)° !5/2 SSJ4.80.S0 1.145 45

4/ 12 5c/6s6p 9

/2 38499.016 1.064

4/ 12 5(/6s6p n/2 38529.686 1.17

4/ 12 5(/6s6p 13

/2 38588.J46 1.212

4/ 12 5t/6s6p 5

/2 38751.812 1.215

4/ 13

( 2F!/2)6s6(/( 3D) 3

t 3/ 2

]° 5

/2 38861.937 1.565 96 or 57 ( 2F7/2)(3Di)

3

/ 2 39602.902 1.30 57 or 64 ( 2F7/2)( 3D3 ) V2 39737.58 0.81 100 or 100 ( 2F7/2)( 3 D3)
347

Tm I, Odd Parity—Continued

Configuration Term J

Level (cm ') 9 Leading percentages

4/ 12 5d6s6p U/2 38877.211 1.065

4/ 12 5d6s6p 13/2 38915.90 1.22

4/ 13( 2 F7/2 )6s6tf( 1 D) H

8

/*]

0 3

/2 39061.819 1.34 57 or 57 ( 2F7/2)(

1 D2)

4/ 13( 2F7/2 )6s6(/( 3D) 3

[ n/2]° n/2 39089.533 1.09 65 or 64 ( 2F7/2)( 3 D2)

13/2 39157.57 1.24 100 or 100 ( 2F7/2)(3 D3)

9

/

39220.035 1.12 78 or 97 ( 2 F7/2)( 3Di)

4/' 13

( 2F7/2 )6s6(/( 3D) 3

[ 5/2]° 7

/

39187473 1.336 76 or 49 ( 2F7/2)( 3 Di)

5 /2 39277.087 1.184 68 or 37 ( 2F7/2)( 3 D3 ) 3

/

39519.90 0.916 86 or 67 ( 2F7/2)(3 D2)

4/ 12 5d6s6p 9

/2 39255.585 1.05

4/ 13

( 2F7/2)6s6t/(3D) 3[ 7

/ 2 ] 0 9

/2 39322.015 1.153 67 or 84 ( 2 F7/2)(3 D2)

7/2 39562.782 1.12 40 or 38 ( 2F!/2 )( 3 Di)

S

/2 39658.852 0.96 72 or 54 ( 2 F7/2)( 3 D3)

4/ 13( 2F7/2 )6s6t/( 1 D) U/2 39362.651 1.13 66 or 66 ( 2F7/2)(

1 D2)

4/ 12 5d6s6p S

/2 39386.959 0.982

4/ 12 5d6s6p 7

/

39513.672 1.165

4/ 12 5d6s6p 13

/ 2 39535-151 1.15

4/ 13( 2F7/2 )6s6c/( 1 D) 9/2 3955^95 1.13 38 H

9^]

0 or 59 ( 2 F7/2)(3 D3)

4/ 13

( 2F7/2 )6s6t/( 1 D) H

5^]

0 5

/2 39570.589 1.04 70 or 70 ( 2 F7/2)( 1 D2 )

4/ 13( 2 F?/2 )6s6(f( 3D) 3

[ 9

/ 2

]° U/2 39579.873 1.21 87 or 95 ( 2F7/2)(3D3)

4/ 12 5d6s6p 7

/2 39580.272 1.17

4/ 12 5c?6s6p 9

/2 39588.236 1.095

4/ 13

( 2F7/2 )6s6c/( 1 D) 1

[ 7/2]° 7

/

39552.165 1.06 81 or 81 ( 2F7/2)( 1 D2 )

4/ 12 5c/6.s6p n/2 39563.003 1.11

4/ 13( 2F7/2 )6s6c/( 3D) 7

/2 39627.996 1.04 45 3[ 9/2]° or 59 ( 2 F7/2)(3 D3)

4/ 12 5t/6s6p n/2 39709.038 1.17

4/ 13

( 2F7/2)6s6t/(>D) H

9/2]° 9

/2 39751.913 1.112 58 or 58 ( 2 F7/2 )(

1 D2 )

4/ 12

( 3F3)6s2 6p3/2 (3,

3/2)° 7

/2 50061.325 1.13 97 2 ( 3 F2 ) (2,

3

/ 2

)° 5

/2 95 3 ( 3 F2 ) (2,

3

/ 2

)° 9

/2 50208.599 1.18 98 1 ( 3 H4 ) (4,

3

/ 2

)° 3

/2 94 4 ( 3 F2 ) (2,

3

/2 )°

4/ 12 5t/6s6p 13

/2 50113.75 4/12 5(/6s6p 9

/2 50322.536 1.115 4/ 12 5t/6s6p 5

/2 50357.267 1.14 4/ 12 5c/6s6p 13

/2 50376.20 4/ 12 5d6s6p 9

/2 50517.661 1.153 4/ 12 5d6s6p 7 /2 50533.825 1.24 4/ 12 5t/6.s6p 7

/ 2 50596.302 1.305 4/ 12 5c/6s6p U/2 50663.129 4/ 12 5(/6s6p ? /2 50763.892 1.178 4/ 12 5rf6s6p 13

/ 2 50780.905 1.22 4/ 12 5rf6s6p 9

/2 50855.580 1.08 4/ 12 5rf6s6p S

/2 50938.61 1.10
348

Tm I, Odd Parity—Continued

Configuration Term J

Level (cm -1

) 9 Leading percentages

4/ 13( 2FS/2)6s7s(3 Si) ( 5/2,l)° 3

/2 ±0989.73 0.40

5

/2 ±107±.399 0.99

7

/2 ±1189.162 1.19

4/ 12 5<76.s6p 7

/ 2 ±1012.387 1.15

4/ 13

( 2 F7/2 )6s8s(3Si) ( 7 /2,l)° 9

/2 ±1078.537 1.32

7

/ 2 ±1211.9±3 1.18

S /2 ±1325.87 0.90

4/ 12 5d6s6p u/2 ±1081 .38

1.295

4/12(3F2 )6s2 6^3/2 (2,

3/2)° 7 /2 ±1085.039 1.005 75 19 OD2) (2,

3 /2)° 4/ 12 5d6s6p 9

/ 2 ±1109.36

1.19

9

/2 ±112±.33± 1.244 4/ 12 5t/6s6p 13/2 ±127±.90 1.12

17/2 ±1299.37 1.08 4/ 12 5d6s6p 7

/ 2 ±1±25.±7± 1.10 4/ 12 5<76.s6p

7

/ 2 ±1525720 1.105 4/ 12 5d6s6p S

/2 ±1533.56

1.025 4/ 12 5d6s6p U/2 ±1569.11± 1.205 4/ 12 5d6s6p 9

/ 2 ±1576.1 ±6 1.249

4/ 13

( 2 F7/2)6s8s( 1 So) ( 7/2,0)° ?/2 ±16±6.129 1.16

4/ 12 5d6s6p ll/ 2 ±1687.±0± 1.145 4/ 12 5d6s6p 3

/ 2 ±17±3.39 0.913 4/ 12 5d6s6p 9

/2 ±1 786.2±9 1.25

4/ 13( 2F7/2)6p2

( 3P0 ) ( 7/2,0)° 7

/ 2 ±18±1.602 1.21 85 9 ( 2 F7/2)( 1 So)

4/ 12 5c?6s6p J1 /2 ±187±.369 1.16 4/ 12 5d6s6p 15

/ 2 ±1880.13 4/ 12 5t/6.s6p 9

/ 2 ±1881.739 1.18 4/ 12 5c/6s6p 13

/ 2 ±19177235 1.15 4/ 12 5d€>s6p ll/2 ±2119.080 1.10 4/ 12 5c?6s6p 7 /2 ±2133.263 1.17 4/ 12 5c?6s6p 5

/2 ±2179.886 1.05 4/ 12 5c/6s6p 5

/ 2 ±2367.610 1.20 4/ 12 5t?6s6p 7

/ 2 ±2370.718 1.043 4/ 12 5t/6s6p 13

/ 2 ±2±06.656 1.125 4/ 12 5(/6s6p U/2 ±25±1.367 1.10 4/ 12 5c/6.s6p 9

/ 2 ±2561.536 1.06 4/ 12 5t/6s6p n/2 ±2581.97

1.135 4/ 12 5c/6s6p 9

/2 ±259±.0±9 1.09 4/ 12 5d6s6p 5

/2 ±2705.880 1.095

4/ 13( 2 FI/ 2)6s7s(iSo) ( S /2,0)° 5

/2 ±2735.208

4/ 12 5c/6.s6p 7

/2 ±27±2.008 1.19 4/ 12 5d6s6p 9

/ 2 ±2770.792 1.215 4/ 12 5c/6s6p 9

/ 2 ±2839.±93 1.086 4/ 12

( 3F4)5t/6s6p( 4F9/2) 15/2 ±2855.±± 1.124 29 (4,

9

/ 2

)°

5

/2 ±2902.50± 1.04 4/ 12 5c/6s6 p

l®/2 ±2910.0±3 1.20 4/ 12 5d6s6p n/2 ±2961.88

1.205 4/ 12 5d6s6p 9

/

2

±3030.299 1.095 4/ 12 5d6s6p 7

/

2

±303±.166 1.15
349

Tm I, Odd Parity—Continued

Configuration Term J

Level (cm -1

) 9 Leading percentages

4/ 12 5d6s6p 15/2 Jt3051.55 1.19

4/ 13( 2 F?/2 )6p2( 3Pi) ( 7

/2, l )° 7 /2 43052.541 1.055 98 1 ( 2 F7/2)( 3P2 ) 9

/ 2 43429.363 1.20 91 7

5

/2 43430.758 1.09 66 27

4/ 12 5d6s6p 5

/2 43113.646 1.114 4/ 12 5d6s6p n/2 43186.335 1.196 4/ 12 5<76s6p 3

/2 43230.70 0.99 4f

l2 od6s6p 1S/2 43288.722 1.175 4f 12 5d6s6p 11/2 43408.960 1.20 4f

12 5d6s6p ? /2 43428.780 1.155 4/ 12 5d6s6p 1S/2 J^SJf.38.2o 1 1.23 4/ 12 5d6s6p 11/2 43447.878 1.105 4/ 12 5d6s6p 9

/2 43544-674

7

/

43588.180 1.248 4/ 12

( 3Hs)5t/6s6p( 4 F7/2) 15/ 2 43614261 1.12 38 (5,

7

/2

)°

4/ 12 5(/6s6p 9

/ 2 43675.258 1.04 4/ 12 5d6s6p n/2 43974.645 1.14 4/ 12 5d6s6p 13

/ 2 43979.308

4/ 12(

1 G4)6s2 6pi/2 (4, 1 /2

)° 9

/2 44001272 1.04 57 32 ( 3 H4 ) (4,

1

/ 2

)°

7 /2 44142.395 1.02 56 33

4/ 12 5d6s6p 13/2 44072.61 4/ 13

( 2F7/2)6p2

( 3P2 ) ( 7/2,2)° "/2 44180.935 1.17 82 18 ( 2 F7/2)( 1 D2)

4/ 12 5(/6s6p 5 /2 44182.324 1.17 4/ 12 5d6s6p 15/2 44210.42 1.15 4f 12 5d6s6p 7

/

44263.974 0.905

4/ 12 5rf6s6p 5

/2 44300.233 1.09 4/ 12 5c/6s6p 13

/2 44307.188 1.13 4/ 13

( 2F7/2)6p2

( 3P2 ) 9

/ 2 44316.715 1.15 46 ( 7 /2,2)° 46 ( 2F7/2)( 1 D2)

4/ 12( 3H5 )5<f6s6p(4F!/2) (5,9/2)° 19

/ 2 44334.66 1.18 98 4/ 12 5c/6.s6p U/2 44383.637 4/ 12 5f/6.s6 p

7

/2 44418.396 4/ 12 5c/6s6p 13

/2 44418.695 1.145 4/ 13

( 2F7/2)6p2

(

X D2) 7

/

44456230 49 ( 7

/2 ,2)° 44 ( 2 F7/ 2)( 3P2 ) 4/ 13

( 2F7/2)6p2

( 3 P2 ) ( 7/2,2)° 3

/2 44483.351 1.005 90 10 ( 2F7/2)( 1 D2)

4/ 12 5(/6s6p 1S

/2 44665.85 1.135 4/ 12 5f/6.s6p 17

/2 44571.82 1.18 4/ 12 5d6s6p 13/2 44591.133 1.04 4/ 12 5(/6s6p 11/2 44747.009 1.17 4/ 12 5rf6s6p 9

/2 44774242

4/ 12 5(/6s6p 13/2 44803.868 1.105 4/ 13

( 2F7/2)6p2

( 3P2 ) 5

/

1.045 43 ( 7/2,2)° 33 ( 2 F7/2)(3 Pi)

4/ 12 5c/6s6p 9

/2 44868.173 1.10 4/ 12 5c/6,s6p n/2 45058.379 1.055 4/ 12 5(/6.s6p 9

/

45070.577 4/ 12 5rf6s6p 9

/2 45147.300 4/ 12 5rf6s6p 11/2 45289.01 1.155 4/ 12 5d6s6p 13/2 45389.06 4/ 12 5(/6s6p 7

/2 45408.656 1.105 4/ 12 5rf6s6p 9

/2 45467.723
350

Tm I, Odd Parity—Continued

Configuration Term J

Level (cm -1

) 9 Leading percentages

4/ 12 5d6s6p 11

/ 2 Jf5Jf85.87 4/ 12 5c/6.s6p 15

/ 2 1,5557.72 1.164 4/ 12

( 3 H5 )5c/6s6/X4 DS/2 ) 15/2 45608.78 1.15 34 (5,

5

/ 2

)°

4/ 12 5d6s6p 11

/ 2 45635.737 1.14 4/ 12 5<f6s6p 13

/ 2 45660.65 1.19 4/ 12 5c/6s6p U/2 45810.508 1.225 4/ 12

( 3 H5)5(f6s6p(4D7/2) 15/ 2 45934-52 1.165 29 (5,

7

/2

)°

4/ 12 5d6s6p 11

/ 2 46163.587 4/ 12 5d6s6p U/2 46221.416 4/ 12 5d6s6p 15/ 2 46461.06 1.18 4/ 12 5d6s6p 13

/ 2 46597.694 1.18 4/ 12 5d6s6p l*/2 46694.096 1.16 4/ 12

( 3 He) 5tf( 2 D)6s6p(?) ( 2 Ft/2) (6,

7

/ 2

)° 17

/ 2 46767.71 1.17

4f

12 5d6s6p u/2 46850.44 1.145 4/ 12 5c/6s6p i3

/2 47027.45 1.17 4/ 12 5d6s6p 13/2 47214.313 1.135 4/ 12 5f/6s6p u/2 47484.84 1.115 4/ 12 5d6s6p 15/2 47630.53 1.162 4/ 12 5f/6s6p l®/2 47644-931 1.175 4/ 12 5d6s6p 13/2 47759.379 1.16 4/ 12

( 3 H4)5</6s6p( 4F7/2 ) (4,

7

/2

)° 15/2 47886.05 1.15 49 4/ 12 5f/6s6p 13

/ 2 48115.671 1.17

Tm II ( 2F7/2 )6si/2 ( 7

/ 2 , 1 / 2 )4 Limit 49879.8 Tm II ( 2F7/2 )6si/2 ( 7

/2, 1 / 2 ) § Limit 50116.8

15/ 2 50563.91 1.18

13

/ 2 51298.366

13

/ 2 51466.730 n/ 2 51 756.675 Tm ii ( 2F5/2 )6si/ 2 ( 5

/ 2,V2 ) 2 Limit 58649.5
351

Tm I, Even Parity

Configuration Term J

Level (cm" 1

) 9 Leading percentages

4/ 12

( 3 H6)5c/3,2 6s2 (6 3

/ 2 ) 9

/2 13119.610 1.305 86 8 ( 3 He) (6,

5

/ 2 ) 15 /2 15271.002 1.08 96 2 ( 3 He) (6,

5

/ 2 ) U/2 15587.811 1.255 76 20 ( 3 He) (6,

5

/2)

13

/ 2 17454.818 1.15 95 2 ( 3 F4) (4,

5

/2)

4/ 12( 3 H6)5(/5/2 6s2

(6,

5

/ 2) 17

/2 16456.913 1.175 99

7

/

16957.006 1.1722 70 7 ( 3 F4 ) (4,

3

/ 2 ) 15

/

18693.074 1.18 97 2 ( 3 He) (6, 3

/2) 9

/2 18837.385 1.1318 76 6 ( 3 He) (6,

3

/ 2 ) n/2 18853.823 1.15 48 32 4/ 13

( 2F7/2 )6s6p(3P2)

13

,/ 2 19466.663 1.15 85 9 ( 3F4 ) (4,5/2)

4/ 13( 2 F7/2 )6s6p(3Po) ( ?/2,0)

7/2 16742.237 1.325 78 17 ( 2 F?/2)( 3 P!)

4/ 13( 2 F7/2)6s6p( 3P!) ( ? /2,l) ?/2 17343.374 1.02153 77 16 ( 2F7/2)( 3Po)

9

/ 2 17613.659 1.18598 94 3 ( 2 F7/2 )( 3P2 ) 5/2 17752.634 1.186 88 9 ( 2 F7/2)(3 P§)

4/ 13( 2F7/2)6s6p( 3P2) ( 7

/ 2,2) n/2 18990.406 1.215 68 21 4/ 12

( 3 H6)5</5/2 6s2

3

/

19132.245 0.88 99

5/2 19548.834 0.983 90 9 ( 2 F7/2)(3 Pi)

9

/ 2 19748.543 1.29 97 3 ( 2 F7/2)(3 Pi)

?/2 19753.830 1.1839 95 2 ( 2 F7/2)(3Po)

4/ 12( 3 F4)5t/3/2 6s2 (4,3/ 2) 7

/

21120.836 1.17372 54 21 ( 7 G4 ) (4,

3

/ 2 ) S

/2 21161.401 1.14 49 29

9

/

21737.685 1.1210 61 25

ll/2 21997.473 1.06 40 26

4/ 12( 3Hs)5cf3/2 6s2

(5,

3/2)

7 /2 22791.176 1.1427 75 5 ( 3 F4 ) ( 4, 5

/ 2 ) 13/2 23374.681 0.98 87 4 ( 3 He) ( 6, 5

/ 2 ) 9

/2 24348.692 1.12 44 28 4/ 13

( 2F?/2 )6s6p( 1 P!)

U/2 25488.545 91 2 ( 3F4) (4,

3

/ 2 )

4/' 12

( 3 H5 )5(fS/2 6s2 5

/2 22929.717 1.152 27 (5,

5 /2) 20 ( 3 F4 ) (4,5/2)

4/i2(3F4)5(f5/2 6s2

(4,

5/2)11

/ 2 23309.979 1.11 56 25 CG4) (4,5/2)

4/ 12

( 3 F4 )5(/5/2 6s2

(4,

5

/a) 9

/2 23781.698 1.1499 49 21 (!G4) (4,5/2)

4/ 12( 3 F4)5c/s/2 6s2 7/2 23873.207 1.135 37 (4,

5

/2 ) 22 4/ 13( 2F7/2 )6s6p( 1 P!)

4/ 12( 3 F4 )5c/s/2 6s2 3

/2 23882.41 37 (4,

s

/2 ) 34 (!G4) (4,5/2)

4/12(3F4 )5(/5/ 2 6s2 13/2 24137.196 1.128 43 (4,

5

/ 2) 28 (!G4) (4,5/2)

4/ 13

( 2F7/2 )6s6p( 1 P!) ( 7/2,l) 5

/2 24418.018 1.06 50 32 4/ 12

( 3 Hs)5c/5/2 6s2

4/ 12( 3 Hs)5(f5/2 6s2 (5,

5

/2) 15

/2 25130.453 1.10 99

7

/

25717.197 1.02 70 12 4/' 13

( 2F7/2)6s6p( 1 P!)

9

/

26889.125 1.11 52 31 4/ 13

( 2 F7/2 )6s6p( 1 Pi)

l 3

/

27377.13 1.12 92 5 ( 3 Hs) (5,

3

/ 2 ) 11/2 27491.31 88 9 ( 3 F3 ) (3,5/2)

4/ 13

( 2FI/2 )6s6p( 3Po) ( 5

/2,0) 5

/2 25656.019 0.724 86 6 ( 2 Fs/2)(3 Pl)

4/ 13

( 2F?/2)6s6p( 1 Pi) S

/2 25745.117 1.09 28 ( 7/2,l) 11 4/ 12

( 3F4 )5f/3/2 6s2

4/ 13

( 2F§/2)6s6p( 3Pi) ( 5/2,l) 5

/2 26126.907 1.10 87 7 ( 2 FI/2)( 3 Po)

?

/

26439.491 1.000 92 4 ( 2F§/2)( 3 P2)

3

/

26488.70 0.85 86 11 ( 2F§/2)( 3PS)

4/ 12

( 3 Hs)5(/3/2 6s2 9

/2 26646.214 0.961 34 (5,

3/2) 25 ( 3 Hs) (5,5/2)

4/ 13

( 2F7/2)6s6p( 1 PI) 7 /2 26701.325 1.076 39 ( ? /2,l) 13 4/ 12( 3 H4 )5(/3/2 6s2

4/ 13

( 2F§/2 )6s6p( 3P2) ( 5/2,2) V2 27314.56 -0.015 100

9

/2 28024.01 1.15 99

3

/

28143.67 0.66 60 10 4/ 12

( 3 H4 )5c/s/2 6s2

5

/2 28448.585 1.000 71 7 4/ 12

( 3 H4 )5c/3/2 6s2

7

/

28555.799 1.157 96 4 ( 2Fs/2 )( 3 P!)

4/ 13

( 2FI/2 )6s6p( 3P2) 5

/

28051.37 0.96 25 ( 5/2,2) 18 4/ 12

( 3 H4 )5c/3/2 6s2
352

Tm I, Even Parity—Continued

Configuration Term J

Level (cm -1

) 9 Leading percentages

4/ 12

( 3 F3 )5(f3/ 2 6s2 7

/

2

29260.59 0.928 46 (3,

3

/ 2) 11 ( 3 H4) (4

,

3

/ 2) 4/ 12

( 3 H4 )5(/3/2 6s2

(4,

3

/ 2 ) 9

/2 29316.690 0.978 50 21 ( 3 F4) (4,

3

/ 2 ) 4/i2

( 3F2)5rf3/2 6s2 5

/2 30082.18 0.81 29 (2

,

3

/ 2 ) 20 ( 3 H4 ) (4,

s

/2 )

4/ 12( 3 H4 )5c/5/2 6s2 7

/

2

30124.02 0.955 24 (4,

5

/ 2 ) 15 ( 3 F4 ) (4

,

5

/ 2 )

4/ 12

( 3 H4 )5t/s/2 6s2 (4

,

5

/ 2) 13

/ 2 30125.61 58 32 ( 3 F4 ) (4,

s

/ 2 )

4/ 12

( 3 H4 )5(/s/2 6s2 5

/2 30302.42 0.91 22 (4,

5

/ 2 ) 18 ( 3F2 ) (2,

3

/ 2 ) 4/ 12

( 3 F3 )5t/3/2 6s2 3

/2 30585.65 1.085 32 (3,

3

/ 2 ) 31 ( 3F2) (2, 3

/ 2 ) 4/ 12

( 3F3)5rf3/2 6s2 9

/

2

30915.02 0.99 28 (3,3

/ 2 ) 27 ( 3 H4 ) (4,

s

/2 ) 4/ 12

( 3 H4 )5(/s/2 6s2

(4,

5

/ 2) U/2 30972.46 46 19 ( 3 F4) (4,

s

/ 2) 4/ 12

( 3 F3 )5(f3/ 2 6s2 5

/

2

31431.88 1.07 42 (3,3

/ 2) 16 ( 3 F2 ) (2,

s

/2 ) 4/i2(3F3)5(/3/2 6s2 9

/2 31440.54 1.13 37 (3,

3

/ 2 ) 30 ( 3 F3 ) (3,

s

/ 2) 4/i2(3F3)5t/5/2 6s2 7

/2 31510.24 1.11 22 (3,

5

/ 2 ) 17 ( 3 F2 ) (2,

s

/2 ) 4/ 12

( 3 F3 )5rf3/2 6s2 3

/2 31520.98 0.79 40 (3,

3

/ 2 ) 20 ( 3 H4 ) (4,

s

/ 2)

4/i2( 3F3 )5c?s/ 2 6s2

(3,

5

/ 2 ) 5

/2 32174.49 1.16 72 6 ( 3F3) (3,

3

/2 ) 9

/

2

32407.78 58 18 ( 3 F3 ) (3, 3

/ 2 ) 7 /2 32811.02 1.04 69 8 ( 3 H4 ) (4, 3

/ 2 ) 3

/

2

32928.76 0.935 48 40 4/ 13

( 2 Fs/2 )6s6p( 1 P!)

u/2 79 7 ( 3Hs) (5,

5

/ 2 ) V2 63 17 ( 3 F2) (2,

3

/ 2 )

4/ 12

( 3F2)5ff3/ 2 6s2 7

/2 32446.26 0.89 41 (2,

3

/ 2 ) 10 ( 3 H4) (4,

s

/ 2) 4/ i2(3p2)5ff5/2 6s2

( 5/2,2)

3

/2 33489.36 1.468 45 18 ( 3F3 ) (3,

5

/ 2) 4yi2(3 F2 )5(/5/2 6s2 7/2 33623.78 0.92 39 (2,

5

/ 2 ) 11 ( 3 F3 ) (3,

3

/ 2) 4/ 13

( 2 FI/2)6s6p( 1 Pi) ( 5 /2,l) S

/2 34085.20 0.95 45 20 4/ 12

( 3 F2 )5ds/2 6s2

4/ 13( 2FS/2 )6s6p( 1 P!) ( 5 /2,l) 7

/2 34297.17 0.915 74 4 4/ 12

(

1 G4)5cf3/ 2 6s2

4/i2(3 F2 )5(f5/2 6s2 (2, s

/ 2) 9

/2 34446.22 58 14 (

j D2) (2,

s

/ 2) 4/ 13

( 2 FS/2 )6s6p( 1 P!) 5

/2 35026.22 1.022 26 ( s

/ 2,l) 23 4/i2

( 3 F2 )5rf5/2 6s2

4/ 13( 2F5/2 )6s6p( 1 P?) 3

/2 35089.67 0.85 33 ( 5

/ 2,l) 21 4/ 12

( 3F3 )5t/s/ 2 6s2

S

/2 35261.762 1.346

5

/2 37064.18 1.42

3

/

2

37138.57 1.56

4/ 13( 2F7/2 )6s7p 7

/2 37557.25 1.313

4y

i3

( 2 F?/2)6s7p 9

/

2

37576.866 1.19

9

/2 37711.074 1.14

4/ 13

( 2 F7/2 )6s7p S

/2 37724.84 1.19

4/ 13

( 2 F7/2 )6s7p 7

/2 37781.90 0.97

4/13

( 2 F7/2 )6s7p 9

/

2

37946.39

5

/2, 7 /2 37980.69 4/12

( 1 G4 )5f?5/2 6s2 5

/

2

38014.37 1.11 40 (4, 5

/ 2 ) 21 ( 3 H4 ) (4,s

/ 2) 4/12

(

1 G4 )5c/3/ 2 6s2

(4,

3

/ 2 ) 9

/2 38120.71 50 38 ( 3H4 ) (4,

3

/ 2) 4/13

(2 F7/2 )6s7p 7

/

2

38123.02 1.14

5

/2 38128.37 1.05

4/13(2 F?/2 )6s7p

3

/

2

38237.89 1.04

4/13

( 2 F?/2 )5c/6p(3 FI) ( 7/2,2) 3

/2 38318.62 1.195 80 9 ( 2 F7/2)(3 F3) 5

/

2

39547.31 1.285 52 21 ( 2 F7/2 )(

1 D2 ) “/

2

40128.384 1.10 74 22 ( 2 F7/2 )(

1 D2) 7/2 40802.56 1.185 65 26 ( 2F7/2)(

X D2) 9

/2 41074.45 1.07 45 41 ( 2Ft/2)(

1 DS)

4/12

(

1 G4 )5(/s/2 6s2 7

/

2

38342.57 1.108 30 (4,

5

/ 2) 27 ( 3 H4 ) (4,

s

/ 2) 4/ 13

( 2 F7/2 )6s7p 5

/2 38433.92 4/ 13

( 2F7/2 )6s7p 9

/2 38502.00 1.10

S

/2 38696.79
353

Tm I, Even Parity—Continued

Configuration Term J

Level (cm" 1 ) g Leading percentages

11/2 38844.072 1.08

9

/2 39019.09

9

/2 39123.17 4/ 13

( 2F7/2 )6s7p 7

/ 2? 39161.45

9

/ 2 39206.84

S /2 39259.92 1.20

4/ 12( 1 G4)5(/s/2 6s2 (4,

5

/ 2 ) 3

/2 39514.74 0.80 53 17 ( 3 H4) (4,

s

/ 2) 4/ 12

(

1G4)5d3/ 2 6s2 7

/ 2 39560.41 0.895 27 (4,3

/ 2) 22 ( 3 H4) (4

3

/ 2)

5

/2, 7/ 2 39580.72

3

/2 39635.56 1.34

9

/2 39698.70 4/ 12

(

1 G4)5(/5/ 2 6s2 (4,

5

/ 2 ) 9

/ 2 39768.79 49 37 ( 3 H4 ) (4,

5

/ 2 )

? /2 39847.04 1.285

ll/2 39942.571 1.191

?/2 39996.221

5

/2 40066.70 1.36

3

/2 40091.58 1.13

9

/2 40101.72

7

/2 40360.37

11

1

40503.326 1.105

9

/2 40516.66

9

/2 40563.90

5

/2 40584.52

13

/ 2 40586.40 1.175

7 /2 40649.441

4/ 13( 2 F7/2 )5(/6p( 3FS) ( 7 /2,3)

3

/2 40693.63 1.31 49 36 ( 2 F?/2)(

1 D§)

V2 41089.05 1.50 89 5 ( 2 1*'7/ 2 )(

1 1

< 3 ) l®/2 41469.44 1.15 96 2 ( 2 F7/2 )( 3D3) n/2 42429.385 1.19 45 31 ( 2F?/2)(3D§)

5

/2 42596.49 39 19 ( 2 F?/2 )(

1 D2 ) 9

/ 2 42764.664 86 6 ( 2F?/2 )( 3 F!)

? /2 42783.46 41 22 ( 2F?/2 )( 3 FS)

4/ 12(

1 G4 )5(/3/2 6s2 5

/2 40787.24 0.91 24 (4,

3

/ 2) 20 ( 3H4 )(4,3

/ 2 ) 13

/ 2 40855.53 1.17

7

/2 41144.66

9

/2 41151.10

13

/ 2 41193.16 1.17

11

1

41352.806 1.07

9

/2 41391.10 1.17 u/2 41430.237 4/ 13

( 2 F7/2)5t/6p(3F3) 5

/2 41493.034 1.29 35 ( 7

/ 2,3) 33 ( 2 F?/2)(

1 Di)

4/ 13

( 2F7/2 )5t/6p( 3D!) ( 7/2,l) 5

/2 41544.59 1.25 54 22 ( 2 Ff/2 )( 3 FS)

9

/

42139.01 1.06 74 9 ( 2 F?/2 )(

1 P?)

7

/

42543.119 1.12 70 11 ( 2 F7/2 )( 3 F§)

4/ 13( 2F7/2 )5t/6p( 3FS) 7

/

41617.243 1.29 22 ( 7/2,3) 18 ( 2 F7/2)( 3 D2 ) ll/ 2 41700.222 1.13

9

/2 41728.003 1.06

S

/2 41751.03 1.08

5 /2 41836.02 4/ 13

( 2F7/2 )5tf6p( 1 D2 ) ( 7/2,2) U/2 42080.152 1.12 58 20 ( 2 F7/2)( 3F2) S

/2 42198.77 1.25
354

Tm I, Even Parity—Continued

Configuration Term J

Level (cm -1

) g Leading percentages

7 /2 42325.81 4/ 13

( 2F7/2)5c/6/j( 1 D2) 3/2 42357.42 1.18 37 ( 7/2,2) 32 ( 2F7/2)(3Fa)

13

/ 2 42456.47 1.20

13/2 42545.150

9

/2 42576.01

11

1

2

42595.791 1.20 4/ 13

( 2 F7/2)5(/6p( 1 Di) 9

/2 42667.745 1.10 41 ( 7

/ 2 ,2) 41 ( 2 F7/2)(3 F2)

5

/2, 7/2 42694.95

9

/2 42718.44 1.12

4/ 13

( 2F7/2)5d6p( 3FI) ( 7 /2,4) 15

/2 42733.10 1.19 100

1 /2 88 5 ( 2 F7/2)( 3 FS)

3

/

2

43800.88 1.21 83 7 ( 2 F?/2)( 3FS)

5

/2 43859.11 51 15 ( 2 F7/2 )( ^L)^)

? /2 44265.285 1.10 66 19 ( 2F?/2)( 3P!)

ll/2 44417.48 1.17 56 38 ( 2 F?/2)( 3Da)

9

/

2

44582.64 1.07 75 9 ( 2 F7/2)( 3 DS)

13

/ 2 81 10 ( 2 F7/2)(

1 Fa)

5

/2, 7/2 42745.68

ll/2 42868.255

13

/2 42869.748

5

/2 42876.38

9

/

2

42902.55

?

/2 42952.02 1.14

ll/2 42957.138

S

/2 42957.52

5

/2 43056.22 4/ 13

( 2F7/2)5t/6p( 1 D2) 7

/2 43098.19 30 ( 7 /2,2) 21 ( 2 F7/2)(3 D2) 9

/2 43115.42

3

/

2

43160.53 4/ 13

( 2F?/2)5d6p(3FS) U/ 2 43196.848 49 ( 7/2,3) 40 ( 2 F7/2)(3D§)

4/ 13

( 2 F7/2)5c/6p( 3D2) ( 7 /2,2)

3

/2 43221.84 1.20 60 17 ( 2F7/2)(3P2)

5 /2 43481.28 71 17 ( 2F7/2)(3 FI)

9

/ 2 43755.64 1.08 86 8 ( 2 F7/2)(

1 D2)

7

/2 43981.104 35 19 ( 2 F7/2)(3PI)

S

/2 43243.00

9

/2 43292.24

7

/2 43303.151

4/ 13

( 2 F7/2)6s8p( 1 PI) ( 7/2,l) 5

/2 43318.02

9

/

2

43357.70

7

/2 43590.42

9

/

2

43354.65

9

/ 43464.15

5

/2 43493.68

7

/

2

43514.41

5

/2 43571.61 U/2 43715.572

4/ 13( 2F7/2 )5c/6p( 3D3) Cl2,3) u/2 43788.44 1.17 37 19 ( 2 F7/2)(3PI)

18/2 43836.666 1.18 76 14 ( 2 F7/2 )( 3FI)

5

/2 43958.23 44 18 ( 2F7/2)( 3 F4)

9

/

2

44380.90 1.15 43 31 ( 2 F?/2)(3P5)

V2 54 37 ( 2 F7/2)( 1 FS)

3

/2 44545.90 1.10 62 26 ^F^IOFI)

7

/

2

44750.078 1.16 43 29 ( 2F7/2)( 3Po)
355

Tm I, Even Parity—Continued

Configuration Term J

Level (cm 1 ) 9 Leading percentages

S

/2 43859.06 1.11

?/2 44206.39 1.04

9

/ 2 44238.85

S

/2 44243.40 U/2 44276.41 1.16

4/12( 3F2)5(/3/2 6s

2 7

/

44323.00 1.09 19 (2,3

/ 2) 19 CD2)(2,3/ 2 )

15/2 44515.01 1.125

S/2 44518.91

7

/

44529.428 0.95

9

/2 44689.913

7/2 44891.22

9

/2 44919.302 1.19

?

/2 45018.23

9

/2 45091.022 1.04

4/ 13( 2 F7/2 )5tf6p( 3Po) ( 7 /2,0)

? /2 45131.67 41 12 ( 2Fv/2)( 3Pi)

7

/

45149.63 u/2 45714.11

5

/2, 7

/2 45908.35

9

/

46238.51 4/ 13

( 2F?/2)5t/6p( 3P2) Cl2,2) “/2 46262.14 1.15 50 24 ( 2 Fv/2)(3 F3)

7

/

46500.09

9

/2 48547.98

4/ 13

( 2 F7/2)6s ( 7

/2,

1 /2)§ 17p3/2? (3,3/2)?3

/

S

/ 2 ? 49458.53

9

/ 2 ? 49460.24

7 /2? 49469.73

4/ 13

( 2 F7/2)6s Cl2,

1 / 2 )3 18p3/2? (3,3

/ 2)?

3

/

5/2? 49560.10

9/2? 49562.54

7 /2? 49565.19

4/13(2F?/2)6s ( 7

/ 2 , 1 / 2 ) 3 19p3/2? (3,

3

/ 2)?

5

/2,7

/ 2, 9/ 2 49626.86

5

/2,7/2,9

/2 49629.49 4/ 13(2F7/2 )6s ( 7

/ 2, 1 / 2)3 20p3/2? (3,

3

/ 2)?

5

/2,7/2, 9

/ 2 49685.22

5

/2, 7/2,9

/ 2 49687.61

4/ 13(2F7/2 )6s Cl2, 1 h)4S0p3/2 (4,3

/2) 5/ 2 _ 9

/ 2 49721.34

4/13(2 F7/2)6s ( 7

/ 2, 1/ 2 )4 31p3/2 (4,3/2 ) 5/2 _ 9

/ 2 49731.20 4/ 13

( 2F7/ 2 )6s ( 7

/ 2, 1 / 2 )

2 lp3/2 (3, 3

/ 2 ) 5/2 _ 9

/ 2 49735.52 4/ 13

( 2F7/2)6s ( 7/2, 1 /2)I32p3/2 (4,

3

/2) 5/2 9

/ 2 49741.82

4/13(2F7/2)6s ( 7

/ 2, 1 / 2 )4 33p3/2 (4,

3

/ 2 ) 5/2 _ 9/ 2 49751.42

4/13(2F7/2 )6s ( 7

/ 2, 1 / 2)4 34p3/2 (4, 3

/2) 5/2 _ 9

/ 2 49758.97 4/ 13

( 2 F7/2 )6s ( 7

/ 2, 1 / 2 )4 35p3/2 (4,

3

/2) 5/ 2 _ 9

/ 2 49767.21 4/ 13

( 2 F7/2 )6s ( 7

/ 2, 1 / 2 )4 36p3/2 (4,3

/2)

5

/ 2 - 9/ 2 49773.39

(4/ 13

( 2F7/2 )6s ( 7/ 2, 1 / 2)3 22p3/2 f(3,

3

/2) 5/2 _ 9

/ 2 49778.61 14/ 13

( 2F7/2 )6s ( 7/ 2, 1 /2 )4 37p3/2 l(4,

3

/2) 4/13(2F7/2 )6s ( 7

/2, 1/ 2 )4 38p3/2 (4,

3

/ 2 ) 5

/ 2 - 9/ 2 49785.26

4/13(2 F7/2 )6s ( 7

/ 2, 1 / 2 )4 39p3/2 (4,3

/ 2) 5/2 _ 9/ 2 49791.45

4/13(2F7/2 )6s ( 7

/2, 1 /2 )I 40p3/2 (4,

3

/ 2 ) 5

/ 2 - 9/2 49796.05

4/13(2F7/2 )6s ( 7

/ 2, 1 / 2 )4 41p3/2 (4,3

/2) 5/2

9

/ 2 49800.21 4/ 13

( 2F?/2)6s ( 7/ 2,V2)S 42p3/2 (4, 3/2 ) 5/2 _ 9

/ 2 49804.50 4/ 13

( 2 F?/2 )6s ( 7

/ 2,V2)4 43p3/ 2 (4,

3

/2) 5/2 _ 9

/ 2 49808.05
356

Tm I, Even Parity—Continued

Configuration Term J

Level (cm^ 1 ) 9 Leading percentages

4/13

( 2F7/ 2)6s ( 7/ 2,V2 )4 44/53/2 (4,

3

/2 ) 5

/2 _ 9/2 49811.66 4/ 13

( 2 F7/ 2)6s ( 7

/2,

1 /2)3 23p3/2 (3,3

/ 2 ) 5/2 - 9

/ 2 49813.72 '

4/13(2F7/2)6S ( 7

/2,

1 /2)3 24pi/2 (3,V2) 5

/2,7/2 49834.98

4/l3

( 2F7/2 )6S ( 7/ 2, 1 /2 ) 3 24/J3/2 (3,3

/ 2 ) 5/2 - 9

/ 2 49842.42

4/i3(2F7/2)6s ( 7

/ 2, 1 /2 )3 25pm (3,V2) 5

/2,7/2 49862.08 4/ 13

( 2 F7/2)6s ( 7/2,V2)3 25/J3/2 (3,

3

/ 2) 5/2 _ 9/ 2 49868.01

Tm ii ( 2F7/2 )6si/ 2 ( 7

/ 2, 1/ 2 )

I

Limit 1>9879.8

4/ 13(2F7/2)6s ( 7/ 2, 1 / 2 )3 26pi/2 (3,V2 ) 5

/ 2,

7

/

2

49884.66

4/13( 2F7/2 )6s ( 7

/ 2, 1 / 2 )3 26/J3/2 (3, 3

/ 2) 5/ 2 - 9

/ 2 49889.94 4/ 13

( 2F?,2)6s ( 7

/ 2, 1 /2 )3 27jt)3/ 2 (3,3

/ 2 ) 5/ 2 - 9/ 2 49908.90 4/ 13

( 2F7/2)6s ( 7

/2,

1 /2)S27pi/2 (3.V2) 5

/2, 7 /2 49920.61

4/ 13( 2 F7/2)6s ( 7

/ 2, 1 /2)3 28p3/2 (3,3

/ 2 ) 5/ 2 - 9/2 49926.21

4/ 13( 2F7/2)6s ( 7 /2,V2)3 28pi/2 (3,V2)

S

/2, 7/ 2 49936.27

4/13(2F7/2 )6s ( 7

/ 2, 1/ 2 )3 29p3/2 (3,3

/ 2) 5/ 2 -9/ 2 49941.28

4/i3( 2F7/2 )6s ( 7

/ 2, 1

/ 2 )3 29pi/2 (3,v2 ) 5

/2,7

/2 49949.54 4/ 13

( 2 F7/2)6s ( 7

/ 2, 1 / 2 )3 30p3/2 (3,

3

/ 2 ) 5/ 2 - 9

/ 2 49954.28 4/ 13

( 2F7/2)6s ( 7

/ 2 , 1 / 2 )3 30pi/2 (3,

1

/ 2) 5

/2,7 /2 49961.74

4/13(2 F7/2)6s ( 7

/ 2, 1 / 2)3 31p3/2 (3,

3

/ 2) 5/ 2 - 9/ 2 49966.04 4/ 13

( 2F7/2)6s ChShtfSlpm (3,V2) 5

/2,

7 /2 49971.78

5

/ 2, 7

/ 2, 9/ 2 49975a

4/13(2F7/2 )6s ( 7

/ 2, 1/ 2 )3 32p3/2 (3,

3

/2) 5/2 _ 9/ 2 49976.41

4/i3(2F7/2)6s ( 7

/ 2, 1 / 2)S 32pi/2 (3,V2) 5

/2, 7 /2 49980.40

4/13(2 F7/2 )6s ( 7

/ 2, 1

/ 2)3 33p3/2 (3,

3

/ 2) 5/2 _ 9/ 2 49985.63 4/ 13

( 2F7/2 )6s ( 7

/ 2, 1 / 2 )3 33pi/2 (3,

1/*)

5

/2, 7

/ 2 49988.19 4/ 13

( 2F7/2)6s ( 7

/ 2, 1 / 2 )§ 34p3/2 (3,

3

/ 2) 5/2 _9

/ 2 49994.04

4/13(2 F7/2)6s ( 7

/ 2, 1 / 2)S 35/J3/2 (3,

3

/ 2) 5/2 _9/ 2 50002.77

4/13(2F7/2)6s ( 7

/ 2, 1 / 2 )§ 36p3/2 (3,3

/ 2) 5

/ 2 - 9/ 2 50009.71

4/i3( 2F7/2 )6s ( 7

/ 2, 1 /2)S 37p3/2 (3 3

/ 2 ) 5/ 2 ~ 9

/ 2 50016.15

4/13(2F7/2 )6s ( 7

/ 2, 1/ 2)3 38jD3/2 (3,

3

/ 2 ) 5/ 2 - 9/ 2 50021.87

4/13(2F7/2 )6s ( 7

/ 2 , 1 / 2 )3 39p3/2 (3,

3

/2 ) 5/2 _ 9

/ 2 50027.42 4/ 13

( 2F7/2)6s ( 7

/ 2, 1 / 2)3 40p3/2 (3,

3

/ 2) 5/2 _ 9

/ 2 50032.10 4/ 13

( 2F7/2)6s ( 7

/ 2, 1 / 2 )3 41p3/2 (3,

3

/ 2) 5/2 _ 9

/ 2 50036.54 4/ 13

( 2F7/2 )6s ( 7

/ 2, 1/ 2 )§ 42p3/2 (3,

3

/ 2) 5

/ 2 - 9/ 2 50040.71 4/i3

( 2F7/2)6s ( 7

/ 2, 1 / 2)S 43p3/2 (3,

3

/ 2) 5/2 _9

/ 2 50044.77

4/13

( 2F7/2)6s ( 7

/ 2, 1/ 2 )3 44p3/2 (3,3

/ 2) 5/2 _ 9

/ 2 50048.38

4/ 13

( 2F7/2)6s ( 7

/ 2, 1 / 2)3 45p3/2 (3,

3

/ 2) 5/2 - 9

/2 50052.09

4/13(2F7/2)6s ( 7

/ 2, 1 / 2)3 46p3/2 (3,

3

/2) 5/ 2 - 9

/2 50054.66

4/13(2F7/2 )6s ( 7

/ 2, 1 / 2)S 47p3/2 (3,3

/2 ) 5

/ 2 - 9/ 2 50057.64

4/13( 2F7/2 )6s ( 7

/ 2, 1 /2)3 48p3/2 (3,3

/ 2 ) 5

/ 2 - 9

/ 2 50060.45 Tm II ( 2F7/2 )6si/2 ( 7

/ 2, 1 / 2 )3 Limit 50116.8

5

/ 2, 7

/2, 9/ 2 50241a

5

/2, 7

/2, 9/2 50709a

5

/2, 7/2,9/ 2 50942a

5

/2, 7/2,9

/2 51125a

5

/2, 7 /2 9/ 2 52083

a

5

/ 2, 7

/ 2, 9

/ 2 52274a
357

Tm I, Even Parity—Continued

Configuration Term J

Level (cm -1

) 9 Leading percentages

5

/2, 7/2, 9

/2 52411a

5

/2, 7

/2, 9

/2 52938a

5

/2, 7/2, 9

/2 53022a

5

/2, 7/2, 9

/2 53706a

5

/2, 7/2,9

/2 53996a

5

/2, 7/2,9

/2 54142a

5

/2, 7/2, 9

/2 54526a

5

/2, 7

/2, 9

/2 54675a

5

/2, 7/2, 9/2 54914a

5

/2, 7/2, 9

/2 55648a

5

/2, 7/2, 9

/2 55835a

5

/2,7

/2, 9

/2 56338a

5

/2, 7/2, 9

/2 56948a

5

/2, 7/2, 9

/2 57241a

5

/2, 7/2, 9

/2 57504a

5

/2, 7/2,9

/2 57736a

5

/2,7/2,9

/2 57971a

5

/2, 7/2,9

/2 58377a

Tm II ( 2 F5/2)6Sl/2 ( 5

/2, V2)2 Limit 58649.5

5

/2, 7

/2, 9

/2 58720

Tm II ( 2 F5/2)6Sl/2 ( 5

/2,

1 /2)§ Limit 58837.3

5

/2, 7

/2,9

/2 58928

5

/2, 7/2,9

/2 59605a?

5

/2, 7/2, 9

/2 60168a

5

/2, 7/2, 9

/2 60314a

5

/2, 7/2,9

/2 60496a

5

/2, 7/2,9

/2 60716a

5

/2, 7/2,9

/2 60938a

5

/2, 7/2, 9

/2 61501a

5

/2, 7/2, 9

/2 61690a

5

/2,7

/2,9

/2 62112a

5

/2, 7 /2 9

/2 62266a

Tm II ( 3 He) Limit 62337.1

5

/2, 7

/2, 9

/2 62657a

5

/2, 7/2, 9

/2 62920a

5

/2, 7/2, 9

/2 63395a

5

/2, 7

/2, 9

/2 63613a

5

/2,7

/2, 9

/2 63857a

5

/2, 7/2,9

/2 64185a
358

Tin ii

(Er i sequence; 68 electrons) Z=69

Ground state (ls 2 2s 2 2p6 3s 2 3p 6 3d 10 4s 2 4p6 4d 10 5s 2 5pfi ) 4/ 13

( 2 F°/2 )6s ( 7

/2 ,V2

)°

Ionization energy 97200± 600 cm" 1 12.05± 0.08 eV

Identified odd configurations 4/ 13 6s, 4/ 13 5d, 4/ 12 6s6p, 4/ 12 5d6p, 4/ 13 7s

Identified even configurations 4/ 12 6s 2

, 4/ 12 5d6s, 4/ 13 6p, 4/ 12 5d2

Meggers first identified the four levels of the 4/ l3 6s ground configuration, and he also published their combinations with 66 upper even levels [1942]. Spector [1962, 1967] and Blaise

and Camus [1965] extended the analysis, the latter authors having new Zeeman data and a list of infrared lines to 2.4 p.m. Theoretical calculations allowed assignment of most of the even

levels to 4/ 12 5d6s, 4/ 12 6s 2

, and 4/ 13 6p, and the odd levels were extended to include 4/ 13 5d and

4/ 12 6s6p.

The further extension and revision of the analysis as given here results mainly from a collaboration between the Laboratoire Aime Cotton (Orsay, France) and NBS [Camus and

Sugar, 1971a; 1971b], Much of the detail of Camus’ work is given in his thesis [1971], The level values are mainly from Camus [1971], with some slightly revised values being supplied by

Sugar [1973], The complete line list for the region 2000-10000 A has not been published;

Spector lists about 200 classified lines (2421-6733 A), and Meggers, Corliss, and Scribner

[1975] give 576 of the stronger Tm n lines in the region 2280-8566 A, most of which are

classified. The list of 537 Tm infrared lines (8014-24483 A) measured by Camus, Guelachvili,

and Verges [1969] includes a number of Tm n lines. Zeeman data for some strong infrared

lines were also obtained by these authors.

The eigenvector percentages for (4/

13 6s+4/ 13 5d) are from Camus’ thesis. The Jl j coupling

scheme is most appropriate for both configurations, although calculated percentages for the

4/ 13 6s levels in this scheme were not available. The leading percentages in LS coupling are given following the word “or.” Wyart, Blaise, and Camus [1974] have recalculated Tm n

(4/

13 6s+4/ 13 5d) with matrices including effective interactions. They found two new 4/ 13 5d

levels, at 23934.73 and 28874.14 cm" 1

. Except for the 4/ 13 7s levels and a few isolated higher odd levels, the known odd levels above the 4/ 13 6s and 4/ 13 5d groups are accounted for by the (4/

l2 6s6p+4/ 12 5d6p)

configurations [Camus and Sugar, 1971b]. Spector showed that the J,J2 coupling scheme was

best for 4/ 12 6s6p, and Camus arranged additional levels of (4/

12 6s6p+4/ 12 5d6p) into J X J2 terms. Such term names as appear meaningful on the basis of the percentages given by Camus and

Sugar [1971b] are retained here. Most of the term-designated levels of this group are given

without percentages, since the appropriate percentages from the calculation including

configuration interaction were not available. In the case of many levels having term purities

significantly below 50%, only the total eigenvector percentages from each of the two

configurations are listed [Camus and Sugar, 1971b].

The calculation of the even levels included all four identified even configurations (with

interaction) and allowed the assignment of 155 levels [Camus and Sugar, 1971a], Most of the

level assignments to the four J^-coupling terms of 4/ 12

( 3 H6 )5d6s were originally made by

Spector. In the arrangement here, three of these terms each have a level “missing” because of

low eigenvector purities, and a couple of interchanged designations were made by Camus.

Approximate percentages in the J X L2 scheme are listed for a number of higher 4/ 12 5d6s levels,

but only two additional term groups are retained for this configuration on the basis of the

percentages given by Camus and Sugar. Some designated levels of 4/ 12 6s2 and 4/ 12 5d6s are given without leading percentages; such levels have significant percentages from more than one configuration, and the published term percentages did not include configuration-interaction

effects [Camus and Sugar, 1971a]. Many levels having low term purities are given here

without designations, but with the total percentages from one or both of the two main
Tm II

Continued 359

configurations. Such total percentages are also listed for all levels belonging mainly to 4/ 12 5d2 or 4/ u

6p, since term percentages from the calculation including configuration interactions were not available.

The ionization energy is from Sugar and Reader. Their estimate of the position of the

4/ u 7s configuration was confirmed very closely by the later experimental value [Camus and

Sugar, 1971b].

References

Allen, L., United Kingdom Atomic Energy Research Establishment AERE-R 4029, 34 pp. (1962). W ZE

Blaise, J., and Camus, P., C. R. Acad. Sci. 260, 4693 (1965). EL ND ZE

Bovey, L. F. H., and Garton, W. R. S., Proc. Phys. Soc. London, Sect. A 67, 476 (1954). W

Camus, P., and Blaise, J., C. R. Acad. Sci. 261, 4359 (1965). EL ZE

Camus, P., Guelachvili, G., and Verges, J., Spectrochim. Acta, Part B 24, 373 (1969). EL CL W ZE

Camus, P., Thesis, Univ. Paris Orsay, 265 pp. (1971). EL ND CL W ZE IP PT

Camus, P., and Sugar, J., Phys. Scr. 4, 257 (1971a). EL ND ZE PT

Camus, P., and Sugar, J., Phys. Scr. 4, 263 (1971b). EL ND ZE IP PT

Goldschmidt, Z. B., Thesis, Hebrew Univ. Jerusalem, 487 pp. (1968). PT

King, A. S., Astrophys. J. 94, 226 (1941). Temperature Classification Meggers, W. F., Rev. Mod. Phys. 14, 96 (1942). EL CL

Meggers, W. F., Corliss, C. H., and Scribner, B. F., Nat. Bur. Stand. (U.S.), Monogr. 145, Part 1, 403 pp. (1975). Spector, N., Thesis, Hebrew Univ. Jerusalem (1962). EL ND CL PT

Spector, N., J. Opt. Soc. Am. 57, 312 (1967). EL CL PT

Sugar, J., unpublished material (1973). EL

Sugar, J., and Reader, J., J. Opt. Soc. Am. 55, 1286 (1965). IP Wyart, J. F., Blaise, J., and Camus, P., Phys. Scr. 9, 325 (1974). EL CL PT

[October 1976]

Tm II, Odd Parity

Configuration Term J

Level (cm -1

) 9 Leading percentages

4/l3

( 2 F7/2 )6sl/2 (7/2,V2)° 4 0.00 1.250 100 or 100 3p°

3 236.95 1.035 or 59

4/ 13

( 2 F5/2)6Si/2 ( 5 /2,V2)° 2 8769.68 0.667 100 or 100 3p°

3 895747 1.055 or 59 »F°

4/ 13( 2 F7/2 )5d3/2 ( 7

/ 2, 3

/ 2

)° 2 17624-65 1.48 75 or 91 (2 F°) 3P°

5 20228.75 1.020 95 or 55 ( 2F°) 3 H°

3 21713.7A 1.22 84 or 70 ( 2F°) 3 D°

4 22457.51 93 or 47 ( 2 p°) 3 p°

4/ 13

( 2 F?/2 )5d5/2 ( 7

/2,5

/ 2

)° 6 21133.68 1.167 100 or 100 ( 2F°) 3 H°

2 21978.77 1.02 76 or 58 ( 2 F°) >D°

1 22141.96 1.325 72 or 78 (2p°) 3p°

4 23524-09 93 or 44 (2 F°) 3p°

3 23934.7

79 or 34 (2 F°) ip° 5 2427330 1.18 95 or 86 ( 2F°) 3 G°

4yi 3(2Fg/2 )5d3 , 2 ( 5

/2,3/ 2

)° 4 28874.14 94 or 85 ( 2F°) 3 H°

2 86 or 41 ( 2 F°) 'D°

3 67 or 87 ( 2F°) 3G°

1 76 or 86 ( 2 p°) ip°

4/ l2( 3 He)6s6p(3P8) (6,0)° 6 38225.46 1.273

4/ 12

( 3 He)6s6p(3P?) (6,1)° 6 39477.60 1.12 7 39638.41 1.185 5 39863.81 1.189

4/ 12

( 3 Hs)6s6p(3 P2 ) (6,2)° 8 42570.92 1.25 4 43217.64 1.07 7 43717.30 1.25 5 43840.82 1.10 6 43998.81 1.20
360

Tm II, Odd Parity—Continued

Configuration Term J

Level (cm -1

) 9 Leading percentages

4/ l2

( 3 F4 )6s6p(3P8) (4,0)° 4 44237.17 1.265

4/ 12 5d6p 4 4483825 1.365 84 16 4/ 12 6s6p

4/ 12

( 3 F4 )6s6p(3 P?) (4,1)° 5 4519125 1.21 3 4533824 1.05 4 45648.93 1.07

4/ 12 5d6p 5 45987.89 1.22 68 32 4/ 12 6s6p

4/ 12

( 3 H5 )6s6p(3 P8) (5,0)° 5 46807.32 1.08

4/ 12 6s6p 7 47299.68 50 50 4/ 12 5d6p

4/ 12( 3 Hs)6s6p(3 P?) (5,1)° 5 47614-14 1.04 6 47927.14 1.095 4 48048.19 1.00

4/ 12

( 3 He)5d6p(3 FS) (6,2)° 8 47654-43 1.06 73

4/ 12 5d6p 5 47808.54 1.25 68 32 4/ 12 6s6p

4/ 12 5d6p 6 48195.94 1.15 68 32 4/ 12 6s6p

4/ 12( 3 F4 )6s6p(3P§) (4,2)° 5 4880726 1.185 6 48898.13 1.27 2 49140.88

4 49147.65 1.19 3 49174-05 1.14

4/ 12 5d6p 6 49195.03 1.19 69 31 4/ 12 6s6p

4/12 5d6p 3 49429.59 1.25 87 13 4/ 12 6s6p

4/ 12 5d6p 7 49765.68 1.105 89 11 4/ 12 6s6p

4/ 12

( 3 He)5d6p( 1 D8) (6,2)° 4 49792.42 1.265

4/ 12( 3 He)5d6p(3 D?) (6,1)° 5 50274-65 1.29 7 52331.33

6 52791.11 1.125

4/ 12 5d6p 6 5061 7.56 1.25 99 1 4/ 12 6s6p

4/ 12

( 3 He)5d6p(3F8) (6,3)° 4 5076621 1.18

4/ 12( 3 Hs)6s6p(3P§) (5,2)° 3 5092627 0.87 7 51176.90

4 51583.14

5 52026.52

6 52056.86

4/ 12 5d6p 5 51081.49 1.25 81 19 4/ 12 6s6p

4/ 12 5d6p 8 5111629 1.175 97 3 4/ 12 6s6p

4/ 12( 3 H4 )6s6p(3P8) (4,0)° 4 51227.72

4/ 12 6s6p 3 51885.80 54 46 4/ 12 5d6p

4/ 12 5d6p 8 52003.50 1.115 100

4/ 12( 3 H4 )6s6p(3 P!) (4,1)° 4 52255.94

4/ 12 6s6p 3 52361.95 61 39 4/ 12 5d6p

4/ 12

( 3 H4 )6s6p(3Pi) (4,1)° 5 52499.37 4/ 12 5d6p 7 52661.66 1.204 99 1 4/ 12 6s6p

4/ 12 5d6p 5 52907.86 1.135 81 19 4/ 12 6s6p
361

Tm II, Odd Parity—Continued

Configuration Term J

Level (cm -1

) 9 Leading percentages

4/ 12 5d6p 4 5300240 82 18 4/ 12 6s6p

4/ 12 5d6p 6 53013.80 1.19 95 5 4/ 12 6s6p

4/ 12

( 3 F3 )6s6p(3 P8) (3,0)° 3 53150.82

4/ l2 5d6p 7 53306.88 97 3 4/ 12 6s6p

4/ 12 5d6p 5 53336.89 77 23 4/ 12 6s6p

4/12 5d6p 2 53611.92 82 18 4/ 12 6s6p

4/ 12 5d6p 3 53696-12 71 29 4/ 12 6s6p

4/ 12 5d6p 4 53576.56 56 44 4/ 12 6s6p

4/ 13

( 2 F?/2 )7si/2 ( 7

/ 2> V2)

0 4 53673.03 1.24 3 53733.50 1.03

4/ ,2( 3 Hs)5d6p(3 DS) (6,2)° 7 53738.88 4/ 12 6s6p 2 53888.56 66 34 4/ 12 5d6p

4/ 12 5d6p 6 53896.66 93 7 4/ 12 6s6p

4/ l2 6s6p 4 53955.66 65 35 4/ 12 5d6p

4/ l2 5d6p 5 5631 7.06 77 23 4/ 12 6s6p

4/ 12

( 3 F3 )6s6p(3P!) (3,1)° 3 56356.01 4/ 12 5d6p 4 56619.68 79 21 4/ 12 6s6p

4/ 12 5d6p 5 56523.58 98 2 4/ 12 6s6p

4/ 12 6s6p 3 56536.96 71 29 4/ 12 5d6p

4/ 12 5d6p 4 56583.82 83 17 4/ 12 6s6p

4/ 12 5d6p 8 5663626 99 1 4/ 12 6s6p

4/ 12 5d6p 3 56679.63 90 10 4/ 12 6s6p

4/ 12 5d6p 6 56710.56 94 6 4/ 12 6s6p

4/ 12 5d6p 7 56988.96 99 1 4/ 12 6s6p

4/ 12 5d6p 3 55138.18 76 24 4/ 12 6s6p

4/ 12 5d6p 6 55157.61 90 10 4/ 12 6s6p

4/ 12 5d6p 5 55167.69 95 5 4/ 12 6s6p

4/ 12 5d6p 6 55676.18 72 28 4/ 12 6s6p

4/ l2 5d6p 6 55753.86 53 47 4/ 12 6s6p

4/ 12 5d6p 7 55758.31 1.03 100 4/ 12 5d6p 4 5583329 57 43 4/ 12 6s6p

4/ 12 6s6p 6 55972.37 54 46 4/ 12 5d6p

4/ 12( 3 H4 )6s6p(3 P2) (4,2)° 3 56062.07 4/ 12

( 3 H4 )6s6p( 3PS) (4,2)° 5 56066.86 4/ 12 5d6p 7 5615729 99 1 4/ 12 6s6p

4/ 12 6s6p 4 56351.99 59 41 4/ 12 5d6p

4/ 12 5d6p 3 56356.92 92 8 4/ 12 6s6p

4/ 12 5d6p 5 56506.66 94 6 4/ 12 6s6p

4/ 12 5d6p 6 56662.72 95 5 4/ 12 6s6p

4/ 12 5d6p 4 5671621 92 8 4/ 12 6s6p

4/ 12 5d6p 5 56853.76 97 3 4/ 12 6s6p

4/ 12 6s6p 5 57050.32 , 52 48 4/ 12 5d6p

4/ l2 5d6p 3 57253.02 64 36 4/ 12 6s6p

4/12 6s6p 3 57665.55 62 38 4/ 12 5d6p

225-298 0 - 78-24
362

Tm II, Odd Parity-—Continued

Configuration Term J

Level (cm -1

) 9 Leading percentages

4/12 6s6p 4 5752046 81 19 4/ 12 5d6p

4/12 5d6p 6 5752640 97 3 4/ 12 6s6p

4/ 12 5d6p 3 57547.98 89 11 4/ 12 6s6p

4/ 12 5d6p 7 57573.34 98 2 4/ 12 6s6p

4/ 12 6s6p 5 57599.35 73 27 4/ 12 5d6p

4/12 5d6p 4 57741.72 91 9 4/ 12 6s6p

4/12 5d6p 6 57829.34 99 1 4/ 12 6s6p

4/ 12 5d6p 4 57859.31 84 16 4/ 12 6s6p

4/ 12 5d6p 3 57919.15 86 14 4/ 12 6s6p

4/ 12 5d6p 6 57961.53 95 5 4/ 12 6s6p

4/ 12 5d6p 7 58051.31 98 2 4/ 12 6s6p

4/ 12 5d6p 5 58107.79 88 12 4/ 12 6s6p

4/ 12 5d6p 6 58236.52 98 2 4/ 12 6s6p

4/ 12 5d6p 4 58351.88 51 49 4/ 12 6s6p

4/12 6s6p 3 58379.52 80 20 4/ 12 5d6p

4/12 5d6p 5 58383.36 98 2 4/ 12 6s6p

4/12 5d6p 6 58500.70 95 5 4/ 12 6s6p

4/ 12 5d6p 5 58538.86 96 4 4/ 12 6s6p

4/12 5d6p 3 5864427 96 4 4/ 12 6s6p

4/12 5d6p 5 5869822 98 2 4/ 12 6s6p

4/12 5d6p 3 58742.98 90 10 4/ 12 6s6p

4/12( 3 F4 )5d6p(3 F§) (4,3)° 7 58978.88 4/ 12 5d6p 4 5906728 88 12 4/ 12 6s6p

2 59135.89 4/ 12 5d6p 2 59156.94 95 5 4/ 12 6s6p

4/ 12 5d6p 4 5929728 80 20 4/ 12 6s6p

4/ 12 5d6p 5 59607.45 85 15 4/ 12 6s6p

4/ 12 5d6p 4 59663.34 94 6 4/ 12 6s6p

4/ 12 5d6p 3 59763.33 79 21 4/ 12 6s6p

4/ 12 5d6p 3 59815.73 96 4 4/ 12 6s6p

4/12 5d6p 4 59889.74 59 41 4/ 12 6s6p

4/ 12 5d6p 4 60004-92 73 27 4/ 12 6s6p

4/ 12 5d6p 3 60116.36 82 18 4/ 12 6s6p

4/ 12 5d6p 5 60255.39 79 21 4/ 12 6s6p

4/ 12

( 3 Hs)5d6p(3 Di) (5,1)° 6 60262.99 4/ 12 5d6p 4 60278.73 86 14 4/ 12 6s6p

4/ 12 5d6p 7 60325.70 100 4/ 12

( 3 H6 )5d6p('F§) (6,3)° 8 60396.70 71 4/ 12 5d6p 6 60418.58 99 1 4/ 12 6s6p

3 6050323

4/ 12 5d6p 7 60539.57 99 1 4/ 12 6s6p

4/12 5d6p 4 60539.76 75 25 4/ 12 6s6p

4/12 5d6p 3 60572.87 92 8 4/ 12 6s6p

4/ 12 5d6p 6 60658.68 99 1 4/ 12 6s6p
Tm II, Odd Parity—Continued

363

Configuration Term J

Level (cm 1 ) 9 Leading percentages

4/ 12 6s6p 4 6074541 66 34 4/ 12 5d6p

4/12 5d6p 6 60832.41 98 2 4/ 12 6s6p

4/ 12 5d6p 5 6091120 91 9 4/ 12 6s6p

4/12 5d6p 4 61114.46 75' 25 4/ 12 6s6p

4/12 5d6p 7 61133.45 98 2 4/ 12 6s6p

4/ 12 6s6p 5 61141.94 79 21 4/ 12 5rf6p

4/ 12 5d6p 4 61213.08 84 16 4/ 12 6s6p

4/ 12 5d6p 6 61241-01 100 4/ 12 5d6p 2 61295.19 88 12 4/ 12 6s6p

4/ 12 6s6p 3 61300.92 57 43 4/ 12 5d6p

4/ 12

( 3 F4 )5d6p(3FS) (4,4)° 6 6130624

4/ 12 5rf6p 5 61356.54 92 8 4/ 12 6s6p

4/ 12 5d6p 4 61449.15 97 3 4/ 12 6s6p

4/12 5d6p 3 61600.79 86 14 4/ 12 6s6p

4/ 12 5d6p 5 61650.80 88 12 4/ 12 6s6p

4/12 5d6p 6 61 703.46 97 3 4/ 12 6s6p

4/ 12 5d6p 5 61745.85 96 4 4/ 12 6s6p

4/ 12 5rf6p 4 61 790.65 86 14 4/ 12 6s6p

4/ 12 5d6p 5 61924-30 97 3 4/ 12 6s6p

4/ 12 5d6p 6 61925.14 98 2 4/ 12 6s6p

4/12 5d6p 4 62108.60 85 15 4/ 12 6s6p

4/ 12 5d6p 7 62113.10 99 1 4/ 12 6s6p

4/12 5d6p 7 62285.76 99 1 4/ 12 6s6p

4/ 12 5d6p 5 62319.36 97 3 4/ 12 6s6p

4/12 5d6p 4 62348.84 87 13 4/ 12 6s6p

4/l3

( 2 FI/2)7Sl/ 2 ( 5/2,V2)

0 2 62429.50

3 6253825

4/ 12 5d6p 3 62439.68 84 16 4/ 12 6s6p

4/12 5d6p 5 62550.58 98 2 4/ 12 6s6p

4/12 5d6p 3 62739.54 85 15 4/ 12 6s6p

4/ 12 5c26p 4 62796.72 94 6 4/ 12 6s6p

4/12 5d6p 4 62854-85 85 15 4/ 12 6s6p

4/ 12 5d6p 3 63206.57 82 18 4/ 12 6s6p

4/ 12 5d6p 5 63533.13 97 3 4/ 12 6s6p

4/ 12 5d6p 5 63605.54 94 6 4/ 12 6s6p

4/ 12 5c£6p 6 63708.71 94 6 4/ 12 6s6p

5 6378729

4/12 5d6p 3 64018.59 88 12 4/ 12 6s6p

4/ 12 5d6p 3 65031.02 97 3 4/ 12 6s6p

4/ 12 5d6p 6 65436.96 96 4 4/ 12 6s6p

4/12 5d6p 4 65512.56 97 3 4/ 12 6s6p

4/ 12 5c£6p 3 65612.85 91 9 4/ 12 6s6p

4/ 12 5d6p 7 6676429 98 2 4/ 12 6s6p

Tm ill ( 2 F?/2) Limit 97200
364

Tm II, Even Parity

Configuration Term J

Level (cm 1 ) 9 Leading percentages

4/ 12( 3 H)6s2 3 H 6 12457.29 1.165 96 5 20619.05

4 24932.00 57

4/ 12

( 3 H6 )5rf6s(3 Di) (6,1) 5 16567.47 1.374 64 7 19619.08 1.02 86 6 22355.43 1.085 55

4/ 12( 3 F)6s2 3 F 4 17974.30 1.175 3 26578.77 1.069 94 2 71

4/ 12( 3 He)5d6s(3 D2 ) (6,2) 4 18291.37 1.25 64 6 19526.82 1.313 44 8 19682.97 1.09 91 7 22052.39 1.209 79

4/ 12( 3 He)5d6s(3 D3) (6,3) 9 20465.82 1.225 100 3 21608.26 1.10 69 8 23024.29 1.21 89 5 23768.84 1.04 59 6 23904.43 1.125 64 7 23961.60 1.20 83

4/ 12 5e£6s 5 21021.98 1.178 88 11 4/ 12 6s2

4/ 12 5d6s 4 22308.82 1.24 96 2 4/ 13 6p

4/ 12 5d6s 4 23803.28 1.08 89 10 4/ 13 6p

4/ l2

( 3 H6 )5d6s(‘D2 ) (6,2) 8 24059.08 1.147 90 5 25014.75 1.185 7 26256.26 1.127 6 26478.28 48

2 25219.51

4/ 12

( 3 F4 )5d6s(3 Di) (4,1) 3 25257.52 1.225 76 4 25696.21 1.25 56 5 26188.47 1.20 43

4/ 12

( 3 F4 )5d6s(3 D2 ) (4,2) 2 25498.77 0.89 74 6 26709.43 1.19 55 3 26837.58 1.085 5 26867.70 0.91

4/ 13 6p 3 25980.02 1.26 55 45 4/ 12 5d6s

4/ 12 5d6s 4 26574.66 1.057 55 45 4/ 13 6p

4/ 12 5d6s 4 27009.39 1.19 80 19 4/ 13 6p

4/12 5d6s 4 27254.42 1.084 83 15 4/ 13 6p

4

f

12 5d6s 2 27294.79 1.045 98 2 4/ 13 6p

4/ 12( 3 Hs)5d6s(3 Di) (5,1) 6 27598.57 0.955 67 4/ 12 5d6s 3 27702 42 1.10 90 9 4/ 13 6p

4/ 12

( 3 H5 )5d6s(3 D2 ) (5,2) 7 28095.31 51 4/ 12

( 3 F4 )5d6s(3 D3 ) (4,3) 6 28096.17 45 4/ 12 5d6s 3 28267.88 1.11 94 5 4/ 13 6p 4/ 12

( 3 F4 )5d6s(3 D3 ) (4,3) 5 28276.32 1.21 81 4/ 12 5d6s 5 28875.12 1.18 65 34 4/ 13 6p

4/ 12

( 3 F4 )5d6s(3 D3 ) (4,3) 7 28974.93 67 4/ 12 5d6s 4 29183.39 1.15 81 18 4/ 13 6p

4/ 13 6p 2 29285.72 0.96 55 45 4/ 12 5d6s
365

Tm II, Even Parity

—Continued

Configuration Term

J

Level (cm -1 ) 9 •

Leading percentages

4/ 12 5d6s 3 29424.98 1.05 49 48 4/ 13 6p

4/ l2 ( 3 Hs)5d6s(3 D3 ) (5,3) 8 29671.40 98 4/ 12 5d6s 2 29967.17 1.05 72 26 4/ 13 6p

4/ 12( 3 Hs)5d6s(3 Di) (5,1) 5 30197.45 0.95 49 4/ 12( 3 Hs)5d6s(3 D2 ) (5,2) 6 30361.06 67 4/ 12 5d6s 4 30377.16 1.12 91 8 4/ 13 6p

4/ 12 5d6s 4 30508.76 1.25 40 19 4/ 13 6p

4/ 12 5d6s 5 30627.58 1.125 89 4/ 12 5d6s 3 30684.43 1.05 90 9 4/ 13 6p

4/12 5d2 4 30840.77 1.29 60 32 4/ 12 5d6s

4/ 12( 3 H4 )5d6s(3 Dt ) (4,1) 3 31036.61 1.08 46 4/ 12 5d6s 2 31090.09 1.03 89 6 4/ 13 6p

4/12 5d6s 4 31135.73 0.91 93 2 4/ 13 6p 4/ 12 5d6s 6 31323.73 85 4/ 12 5d6s 5 31726.40 1.055 85 14 4/ 13 6p

4/ 12 5d6s 3 31745.49 0.95 75 23 4/ 13 6p

4/12 ( 3 Hs)5d6s(3 D3 ) (5,3) 7 31836.90 83 4/ 12 5d6s 4 31900.00 1.17 72 25 4/ 13 6p

4/ 12 5d6s 5 31926.82 1.175 63 32 4/ 13 6p

4/12( 3 Hs)5d6s(3 D3 ) (5,3) 6 32289.22 80 4/ 12 5d6s 2 32500.26 0.98 90 6 4/ 13 6p 4/ 12 ( 3 Hs)5d6s( 1 D2 ) (5,2) 7 32590.14 85 4/ 12 5d2 6 32917.50 97 3 4/ 12 5d6s

4/ 12 5d2 5 33036.56 1.265 95 4 4/ 12 5d6s

4/12 5d6s 2 33096.78 0.73 98 2 4/ 13 6p

4/ 12 5d6s 6 33150.48 99 4/ 12 5d2 7 33182.00 97 3 4/ 12 5d6s

4/ 12 5d6s 4 33391.55 1.03 79 8 4/ 13 6p

4/12 5d6s 3 33398/70 1.07 93 4 4/ 13 6p

4/ 12 ( 3 F3 )5d6s(3 Di) (3,1) 3 33565.12 0.88 45 4/ 12 5<26s 4 33665.99 0.908 87 9 4/ 12 6s2 4/12( 3 H4 )5d6s(3 D2 ) (4,2) 5 34157.64 1.06 57 4/ 12 5c?6s 4 34307.52 0.98 97 1 4/ 13 6p

4/ 12 5d6s 3 34398.30 0.98 82 17 4/ 13 6p 4/12 ( 3 F2 )5d6s(3 Di) (2,1) 2 34404.26 0.79 50 4/ 12 ( 3 Hs)5d6s( 1 D2 ) (5,2) 5 34580.75 1.055 65 4/ 12 5d2 ? 7? 34685.75 94 6 4/ 12 5d6s

4/12 5d2 8 34766.81 100 4/ 12 5d6s 4 34871.37 1.05 96 3 4/ 13 6p

4f12 5d2 3 34913.84 1.377 98 2 4/ 12 5rf6s 4/ 12 ( 3 F2 )5d6s(3 D2 ) (2,2) 1 34984.88 0.887 48 4/ 12 5d6s 2 35003.98 0.91 76 22 4/ 13 6p

4/ 12 5d2 4 35122.91 92 6 4/ 12 5d6s

4/ 12 ( 3 H4 )5d6s(3 D3 ) (4,3) 7 35195.12 93 4/ 12 5d2 5 35227.68 94 5 4/ 12 5d6s

4/ 12 5d6s 2 35274.43 1.15 64 33 4/ 13 6p
366

Tm II, Even Parity—Continued

Configuration Term J

Level (cm -1

) 9 Leading percentages

4/ 12 5d6s 3 35380.12 0.92 80 18 4/ 13 6p

4/ 12 5d6s 3 35753.72 1.152 93 7 4/ 13 6p

4/ 12 5d6s 5 35772.82 1.12 97 2 4/ 13 6p

4/ 12 5d6s 1 35806.78 0.877 97 3 4/ 13 6p 4/ 12 5d6s 2 35833.62 1.05 73 2 4/ 13 6p

4/ 12 5d6s 4 35966.41 1.21 97 1 4/ 13 6p

4/ 12 5d2 6 35979.94 86 14 4/ 12 5d6s

4/ 12 5d6s 3 36041.02 1.145 92 4 4/ 13 6p

4/ 12 5d6s 3 36132.08 0.915 57 42 4/ 13 6p

4/ 12( 3 H4 )5d6s(3 D3 ) (4,3) 6 36145.30 63 4/ 12 5d6s 2 36394.64 1.02 67 30 4/ 13 6p

4/ 12 5d6s 4 36547.84 0.89 98 1 4/ 13 6p

4/ 12 5

d

2 7 36805.72 97 3 4/ 12 5d6s

4/ 12 5d6s 3 36868.99 1.11 89 7 4/ 13 6p

4/ 12 5d2 2 37151.09 1.273 68 30 4/ 12 5d6s

4/ 12 5d6s 2 37482.67 1.11 85 10 4/ 13 6p

4/ 12 5d6s 4 37581.47 1.06 93 4 4/ 13 6p

4/ 12 5d6s 4 37775.23 63 32 4/ 12 5d

2

4/12 5d6s 2 37841.25 1.387 94 4 4/ 13 6p

4/ 13 6p 1 37916.11 0.58 65 34 4/ 12 5d6s

4/ 12 5d2 3 37957.72 0.915 70 28 4/ 12 5d6s

4/ 12 5d2 6 37968.84 97 3 4/ 12 5d6s

4/ 12 5d6s 4 38093.53 1.06 77 4 4/ 13 6p

4/ 12 5d6s 5 38200.36 62 4/ l2 5d6s 3 38261.05 77 3 4/ 13 6p

4/ 12 5d6s 4 38361.24 1.035 34 20 4/ 13 6p

4/ 12( 3 F2 )5d6s(3 D3 ) (2,3) 1 38533.56 1.81 74 4/ 12

( 3 F3 )5d6s( 3 D3 ) (3,3) 6 38537.96 52 4/ 12 5d2 3 38582.95 1.00 62 33 4/ 12 5d6s

4/ 12 5d2 7 38981.51 100 4/ 12 5d6s 1 38990.65 1.37 86 13 4/ 13 6p

4/ 12 5d6s 3 38991.96 66 9 4/ 13 6p

4/ 12 5d6s 2 39000.76 1.16 83 3 4/ 13 6p

4/ 12 5d6s 4 39025.63 62 2 4/ 13 6p

4/ 12 5d2 5 39092.22 92 8 4/ 12 5d6s

4/ 12 5d2 6 39149.06 96 4 4/ 12 5d6s

4/ 12 5d6s 4 39162.07 1.05 53 3 4/ 13 6p

4/ 12 5d2 2 39196.70 1.03 82 13 4/ 12 5d6s

4/ 12 6s2 2 39514.68 1.247 41 27 4/ 13 6p

4/ 12 5d6s 3 39554.05 1.10 55 17 4/ 13 6p

4/ 12 5d6s 4 39636.53 41 37 4/ 13 6p

4/ 12 5d2 6 39713.04 95 5 4/ 12 5d6s

4/ 12 6s2 2 39828.63 40 27 4/ 12 5d6s

4/ 12 5d6s 4 39843.24 1.11 46 22 4/ 13 6p

4/ 12 5d6s 3 39893.87 1.006 60 31 4/ 13 6p
367

Tm II, Even Parity—Continued

Configuration Term J

Level (cm' 1 ) 9 Leading percentages

4/ 12 5d6s 5 39968.72 96

2 40056.32 1.23 4/ 12 5d2 1 40063.47 1.37 78 20 4/ 12 5d6s

4/ 12 5d6s 2 40232.29 1.16 65 14 4/ 13 6p

4/ 12 5d2 6 40357.52 97 3 4/ 12 5d6s

4/ 12 5d6s 3 40359.75 72 16 4/ 13 6p

4/12 5d2 7 40423.03 100

6 40446.40

2 40505.88 1.135 3 40545.25 1.010

4 40959.37 4/ 12 5d6s 1 40988.49 0.66 75 8 4/ 13 6p

4/ 12 5d2 4 41166.36 89 11 4/ 12 5d6s

4/ 12 5d2 5 41511.64 72 28 4/ 12 5d6s

4/ 12 5d2 5 41541.81 87 13 4/ 12 5d6s

5 41634.85

2 41682.46 4/ 12 5d2 3 41846.63 99 1 4/ 12 5d6s

4/ 12(

1 G4 )5d6s(3 D2 ) (4,2) 6 41918.58 88 4/ 12 5d2 5 42187.96 97 3 4/ 12 5d6s

4/ 12 5d2 6 42921.77 96 4 4/ 12 5d6s

4/ 12 5d2 4 43295.21 90 9 4/ 12 5d6s

4/ 12 5d2 5 43896.02 96 4 4/ 12 5d6s

4/ 12 5d2 5 43899.14 98 2 4/ 12 5d6s

4/ 12

(

1 G4 )5d6s(3 D3 ) (4,3) 7 43928.00 98 4/ 12 5d2 8 44129.13 100

Tm hi ( 2 F?/2 ) Limit 97200
368

Tm ill

(Ho I sequence; 67 electrons) Z=69

Ground state (ls 2 2s 2 2p6 3s 2 3p6 3d 10 4s 2 4p6 4d I0 5s2 5pfi ) 4/ 13 2 F°/2

Ionization energy 191000± 800 cm 1 23.68± 0.10 eV

Identified odd configurations 4f

u

, 4/ 12 6p

Identified even configurations 4/ 12 5d, 4/ 12 6s

Sugar has classified more than 450 lines of this spectrum in the region 1977-5868 A. His

analysis was based on a list of 848 sliding-spark lines assigned to Tm hi, but only the

classified lines are given in the 1970 paper.

The levels are mainly from Sugar’s paper, which gave 108 levels, but include several new

even levels from his unpublished extension of this work [1973].

The eigenvector percentages for (4/

12 5d+4/ 12 6s) are from an unpublished calculation by

Sugar [1973] that included configuration interaction and appropriate effective operators. The

coupling in these configurations is highly intermediate, the purity being somewhat higher in the JJ scheme used for the designations. The eigenvectors for three of the known levels of

this group have a large second component belonging to the configuration alternate to that for the first component. The second percentages are listed for these three levels to show the

strong configuration interaction; for all other levels of the group, the leading percentage in the

LS-coupling scheme is given instead of the second J x j component.

Wyart, Blaise, and Camus [1974] give the parameter values obtained from a calculation of

(4/

12 5d+4/ 12 6s) including configuration interaction.

The percentages in J^j coupling for the 4/ 12 6p levels are taken from Sugar’s 1970 paper. Sugar has also supplied from this same calculation the leading percentages in LS coupling for

inclusion here.

The ionization energy is from Sugar and Reader [1973], According to Sugar, observation

of the spectrum with a higher-excitation sliding spark could be expected to give a considerable

extension of the line list and analysis.

References

Sugar, J., J. Opt. Soc. Am. 60, 454 (1970). EL CL W IP PT

Sugar, J., private communication (1973). EL PT

Sugar, J., and Reader, J., J. Chem. Phys. 59, 2083 (1973). IP Wyart, J. F., Blaise, J., and Camus, P., Phys. Scr. 9, 325 (1974). PT

[July 1976]
369

Tm hi

Configuration Term J

Level

( cm -1) Leading percentages

4/13 2 p° 7/

0.00

5 /2 877It.02

4/ 12( 3 H6 )5d3/2 (6,3

/2 ) 9

/2 22897.47 84 or 81 ( 3 H) 4 F

1S

/ 2 25878.84 96 or 55 ( 3 H) 2 K

n/ 2 26252.40 72 or 78 ( 3 H) 4G

l3

/ 2 28720.87 92 or 33 ( 3 H) 4

I

4/i2(3 H6)6si/2 (6, l / 2 ) 13

/ 2 25302.65 99 or 99 ( 3 H) 4 H

n/2 25920.78 94 or 64 ( 3 H) 2 H

4/ 12

( 3 He)5d5/2 (6,

5

/ 2 ) 7 /2 27547.25 53 or 51 ( 3 H) 4 F

17

/ 2 27557.98 92 or 99 ( 3 H) 4 K

"/2 30532.34 61 or 41 ( 3 H) 2 H

9

/2 30535.69 60 or 39 ( 3 H) 4G

lS

/ 2 30664.98 96 or 84 ( 3 H) 4I 13

/ 2 31323.46 72 or 40 ( 3 H) 4 H

4/ 12( 3 F4 )6si/ 2 (4//2 ) 9

/31037.52 63 or 63 ( 3 F) 4 F

7 /2 31368.59 58 or 42 ( 3F) 2 F

4/ 12

( 3 F4 )5d3/2 (4

,

3

/ 2 ) 5/2 31570.50 44 or 22 (

4 G) 2 F

7

/

32262.88 47 or 22 ( 3 F) 4 D

9

/

32797.68 52 or 22 ( 3F) 4G

n/2 33236.12 30 or 19 ( 3 F) 4G

4/ 12( 3 Hs)5d5/2 (5, s

/ 2 ) 5

/ 2 33605.40 42 or 61 ( 3 H) 4 F

7 /2 36405.98 41 or 16 ( 3 H) 4 F

15/2 36466.44 99 or 59 ( 3 H) 4 K

9

/38610.32 43 22 ( 3 H4 )6si/2 1S/2 39496.32 90 or 57 ( 3 H) 4

I n/2 39604.23 79 or 45 ( 3 H) 4 H

4/12

( 3 Hs)5d3/2 (5,

3

/ 2 ) 7 /2 33630.68 55 or 45 ( 3 H) 2 F

13/2 34124.20 86 or 56 ( 3 H) 4 K

n/2 36810.12 85 or 42 ( 3H) 4

I 9

/37028.88 65 or 48 ( 3 H) 2G

4/ 12( 3 Hs)6si/2 (5,

1 / 2 ) n/2 33802.80 95 or 64 ( 3 H) 4 H

9

/33831.91 99 or 65

4/ 12

( 3 F4 )5ds/2 (4,

s

/2 ) n/2 34826.83 56 or 46 ( 3F) 4G

4/12( 3 F4 )5rfs/2 (4,

5

/ 2 ) 9

/35751.15 57 or 34 ( 3F) 4 F

4/12

( 3 F4 )5ds/2 15/2 36369.12 33 (4,

5

/2) or 33 ( 3F) 4 H

4/ 12

( 3 F4 )5d3/2 5

/2 36391.74 23 (4,

3

/ 2 ) or 28 ( 3 F) 4 P

4/ 12

( 3 H5 )5d5/2 7 /2 37367.92 30 (5,

5

/ 2) or 31 ( 3 F) 4 D

4/ 12

( 3 H4 )6si/2 9

/2 38003.36 36 (4,

1 / 2) 29 ( 3 H5)5C?5/2

4/ 12

( 3 H4 )6si/2 (4,Va) 7 /2 38055.53 58 or 58 ( 3 H) 4 H

4/ 12

( 3 F4 )5ds/2 3

/

38175.36 35 (4,

5

/ 2) or 30 ( 3 F) 4 F

4/ 12

( 3 H4 )5d3/ 2 (4, 3

/ 2 ) n/2 39142.50 51 or 42 ( 3 H) 4K

4/ 12( 3 Hs)5d5/2 S

/2 39278.57 25 (5,5

/ 2 ) or 33 ( 3 H) 2F

4/12

( 3 F3 )6si/2 (3,V2) 5 /2 39882.62 79 or 84 ( 3 F) 4F

7

/39934.71 94 or 64

4/ 12

( 3 F3 )5d3/ 2 (3,

3

/ 2 ) 7

/

40070.58 48 or 34 ( 3F) 4G

4/ 12

( 3 H4 )5d3/2 (4,

3

/2 ) 9

/

40400.90 50 or 30 ( 3 H) 4

I

4/i2(3 F2 )6s 1 /2 (2,

l /2) 3

/2 40403.59 78 or 78 ( 3F) 4 F
Tm III —Continued

Configuration Term J

Level (cm -1

) Leading percentages

4/ 12( 3 F2 )6Sl/2 5/2 40754.18 38 (2.V2) 23 ( 3 F2)5d3/2

4/i2(3F2 )5d3/ 2

? /2 41233.38 22 (2,3/2 ) or 21 ( 3 F) 2 F

4/12( 3 F3 )5d3/2 3

/2 41595.66 30 (3,3/2) or 35 (3F) 2P

4/ 12( 3 H4 )5d5/2 (4,5/2) 13

/ 2 41864.33 55 or 38 ( 3 H) 2 K

4/ 12( 3 F3 )5d3/2 9

/2 42669.92 36 (3,3/2) or 36 ( 3 F) 4 H

4/ 12

( 3 F3 )5d3/2 5/2 42915.07 39 (3,3/2) or 36 ( 3 F) 4 F

4/ 12( 3 H4 )5d5/2 ii/2 42952.97 44 (4,

5

/ 2 ) or 34 ( 3 H) 2

I

4/ 12

( 3 F3 )5d5/2 9

/2 43022.30 33 (3,

5

/ 2) or 29 ( 3 F) 4G

4/ 12( 3 F3 )5d5/2 (3,5

/2) 7 /2 43139.50 38 or 45 ( 3 F) 4 F

5 /2 43768.40 64 or 32 ( 3 F) 4 D

9

/

2

44495.79 52 or 41 ( 3 F) 2 H

3

/2 56 or 81 (3 F) 4p

li/2 72 or 54 ( 3 F) 4 H

V2 59 or 52 ( 3F) 2P

4/ 12

( 3 F3 )5d3/2 3/2 43160.58 34 (3,3/2) or 31 (3R) 4 F

4/ 12

( 3 F3 )5d5/2 7 /2 44496.38 27 (3,

5

/ 2) or 64 ( 3 F) 2G

4/ 12

( 3 H4 )5d3 /2 7/2 45732.62 26 (4,3/2) or 38 (3 F) 2 F

4/ 12(

1 G4 )5d5/ 2

7 /2 45794.62 24 (4,3/2) or 27 ( 3 F) 4 H

4/ 12(

1 G4 )6si/2 (V/2) 7

/

2

46786.94 55 or 55 (

X G) 2 G

9

/

2

46816.79 54 or 54

4/i2(3 F2 )5d5/2 (2,5/2) 9

/

2

47070.54 54 or 32 (3 F) 2 H

4/ 12

(

1 G4 )5d3/ 2 (4,

3

/ 2 ) 11/2 47603.51 55 or 55 (*G) 2I

4/12

( 3 F2 )5d5/2

5

/2 47624.18 43 ( 2, 3

/ 2 ) or 52 ( 3 F) 2 D

4/12(

1 G4 )5d3/2 (4

,

3

/ 2 ) 9

/

2

49206.69 47 or 42 (

X G) 2 H

4/12(

1 G4 )5ds/2 7 /2 50562.58 35 (4,3/2) or 43 GG) 2 F

4/12

(

1 G4 )5d3/ 2

7 /2 51071.25 33 (4,3/2) or 40 (

X G) 2 G

4/12

( 1 G4 )5ds/2 (4,5/2) 9

/

2

51634.22 47 or 37 (

X G) 2G

4/ l2

(

1 D2 )5d3/2 5/2 52679.70 20 (2,3/2) or 27 (

X G) 2 F

4/ 12( 3P2 )6si/ 2 5/2 53565.42 41 (2, x /2) or 41 ( 3P) 4 P

4/ 12(

1 D2 )6si/2 3/2 53778.35 44 (2,V2 ) or 44 (

X D) 2D

4/ 12

( 3 P2 )5d5/2

7 /2 55586.87 22 (2,3/2) or 36 ( 3 P) 4 D

4/i2(3 P2 )5d3/2 (2

,

3

/ 2 ) 3h 55735.51 47 or 40 ( 3P) 4 D

4/12

( 3 P2 )5d3/2 5

/2 56217.70 22 (2,3/2) or 28 ( 3 F) 2 F

4/12(

1 D2 )5d3/2 7

/

2

57779.95 21 (2,3/2) or 31 (*D) 2G

4/12(

1 D2 )5d5/2 5

/2 59029.55 37 (2,3/2) or 24 (

X D) 2F

4/ 12(

1 Ie)5d3/2 (6,3/2) 9

/2 60640.80 79 or 91 (

X I) 2G

4/ s2( 3 He)6pi/2 (6,V2)° 11/2 62063.57 96 or 72 ( 3 H) 4G°

13

/ 2 62572.76 99 or 46 (3 H) 2J°

4/12

( 3 Po)5ds/2 5

/2 63527.40 32 (0,3/2) or 44 (3P) 4D
Tm in—Continued

Configuration Term J

Level (cm' 1 ) Leading percentages

4/ 12

(

1 I 6 )5d5/2 (6,5

/ 2 ) ? /2 63659.90 85 or 85 01) 2G

4/ 12

( 3 He)6p3/2 9

/2 67460.01 45 (6,

3

/ 2 ) ° or 24 ( 3 H) 2G°

4/ 12

( 3 H6 )6p3/2 (6,

3

/ 2

)° X5/2 67715.59 99 or 99 ( 3 H) 4 I° “/

68672.59 92 or 47 ( 3 H) 2 H°

13

/2 68839.1

99 or 74 ( 3 H) 4 H°

9

/2 68853.73 50 or 28 ( 3 H) 2G°

4/12

( 3 F4)6Pi/2 (4,

1

/ 2

)° 7

/2 67881.05 62 or 33 ( 3 F) 4 D°

4/ 12( 3 Hs)6pi/2 (5,

1

/ 2

)° “/» 70724-8A 96 or 53 ( 3 H) 4I°

9

/2 70732.76 95 or 42 ( 3 H) 2G°

4yi2(3 F4 )6p3/2 (4,3

/ 2

)° 9

/

73657.35 60 or 49 ( 3 F) 4 F°

S

/2 73852.67 51 or 31 (

l G) 2 F°

u/2 73909.63 60 or 60 ( 3 F) 4G°

7

/

74058.85 54 or 24 ( 3F) 2 F°

4/ 12

( 3 H4 )6pi/2 (4,

1 /2)° 7 /2 74882.03 47 or 27 ( 3 H) 4G°

9

/75088.63 55 or 40 ( 3 H) 4 I°

4/ l2

( 3 Hs)6p3/2 (5,

3

/ 2

)° 7 /2 75918.48 55 or 48 ( 3 H) 2G°

18/2 76140.58 100 or 67 ( 3 H) 4I°

9

/

76807.38 96 or 37 ( 3 H) 2 H°

”/2 77057.78 99 or 59 ( 3 H) 4 H°

4/12

( 3F3 )6pi/2 (3,V2)° 5

/2 76721.50 87 or 44 ( 3F) 4 F°

7

/

77396.62 73 or 38 ( 3F) 4 G°

4yi2(3 F2 )6p 1/2 (2.V2

)° 3

/2 77379.98 76 or 44 ( 3 F) 4 F°

5

/2 77729.94 63 or 41 ( 3 F) 4G°

4/12(3 H4)6p3/2 (4,

3

/2

)° 5 /2 80483.1

57 or 57 ( 3 H) 4G°

“/2 80688.04 59 or 38 ( 3 H) 2 I°

7

/81011.48 55 or 37 ( 3 H) 4 H°

9

/

81075.87 56 or 22 ( 3 F) 4 F°

4/ 12( 3 F3 )6p3/2 (3,

3 /2)° 7

/82440.04 95 or 54 ( 3F) 4 F°

5

/2 82573.05 85 or 48 ( 3 F) 4 D°

3

/

79 or 74 (3F) 4 D°

9

/

95 or 67 ( 3F) 4 G°

4/i 2

( 3 F2 )6p3/ 2 (2,

3 /2)° S

/2 83216.81 64 or 42 ( 3 F) 2 F° V2 80 or 80 ( 3 F) 4 D°

3

/8344125 63 or 39 ( 3 F) 2 D°

7

/

83671.59 66 or 49 ( 3 F) 2G°

4/ 12

(

1 G4 )6pi/2 (4.V2 )° 9

/2 83597.38 55 or 46 OG) 2 H°

7

/

84082.50 48 or 29 OG) 2F°

4/ ,2

(

1 G4)6p3/ 2 (4,3

/ 2

)° S

/2 89076.80 55 or 55 (

l G) 2F°

li/2 57 or 57 OG) 2 H°

? /2 89347.11 56 or 36 OG) 2G°

9

/

89706.10 56 or 42 OG) 2G°

Tm IV ( 3 He) Limit 191000
372

[Tm IV J

(Dy i sequence; 66 electrons) Z=69

Ground state (ls 2 2s 2 2p6 3s 2 3pfi 3d 10 4s 2 4p6 4d 10 5s2 5pfi ) 4/ 12 :, H6

Ionization energy 344000± 3000 cm 1 42.7±0.4 eV

The spectrum of the free ion has not been analyzed. The positions given here are centers

of gravity of the Stark components of the corresponding levels of the ion in Y2 03

. The values

(rounded off to the nearest 10 cm -1

) are from the paper by Gruber, Krupke, and Poindexter,

who observed absorption and fluorescence spectra. The 4/ 12 levels have also been evaluated for

the ion in other crystals, e.g., thulium ethyl sulfate [Johnsen; Gruber and Conway; Wong and

Richman; Krupke and Gruber], and from solution absorption spectra [Carnall, Fields, and

Rajnak, 1968]. Absorption transitions to the 'D, 'I, and :! P levels of 4/ 12 have also been

observed, but we omit these higher levels. Krupke and Gruber have published eigenvectors for Tm iv 4/ 12

. The percentages given

here are from unpublished results of Carnall et al. [1974], Several calculations of Tm iv 4/ 12 published since about 1959 yield a value of —6 for the intermediate coupling parameter £/F 2 [see Morrison and Wortman], All such calculations give roughly the same eigenvectors, and the

old reversal of the 3 H4 and 3 F 4 designations from the correct respective levels should be

discontinued; the 3 H percentage of the lowest level having J=4 (—5640 cm

-1

) is about 8%, as compared with the leading percentage of about 63% 3 F for this level. Sugar and Reader obtained the ionization energy.

References

Carnall, W. T., Fields, P. R., and Rajnak, K„ J. Chem. Phys. 49, 4424 (1968). [EL] [CL] [W] PT

Carnall, W. T., Fields, P. R., and Rajnak, K., unpublished material (1974). PT

Dieke, G. H., Spectra and Energy Levels of Rare Earth Ions in Crystals, Ed. H. M. Crosswhite and H. Crosswhite, pp. 309-312 (Interscience Publishers, New York, 1968). [EL] [CL] [W]

Gruber, J. B., and Conway, J. G., J. Chem. Phys. 32, 1178 (1960). [EL] [CL] [W] PT

Gruber, J. B., Krupke, W. F., and Poindexter, J. M., J. Chem. Phys. 41, 3363 (1964). [EL] [CL] [W] PT

Jenssen, H. P., Linz, A., Leavitt, R. P., Morrison, C. A., and Wortman, D. E., Phys. Rev. B 11, 92 (1975). [EL] [CL] [W]

PT

Johnsen, U., Z. Phys. 152, 454 (1958). [EL] [CL] [W] [ZE]

Krupke, W. F., and Gruber, J. B„ Phys. Rev. 139, A2008 (1965). [EL] [CL] [W] PT

Morrison, C. A., and Wortman, D. E., U.S. Nat. Tech. Inform. Serv., AD Rep. No. 735319, 29 pp. (1971). PT

Runciman, W. A., and Wybourne, B. G., J. Chem. Phys. 31, 1149 (1959). PT

Sugar, J., and Reader, J., J. Chem. Phys. 59, 2083 (1973). IP Wong, E. Y., and Richman, I., J. Chem. Phys. 34, 1182 (1961). [EL] [CL] [W] LZE] PT

[July 1976]

[Tm IV]

Configuration Term J

Level (cm -1

) Leading percentages

4/12 3 H 6 0 99 1 n

5 [8090] 100 4 [12500] 60 27 3 F

4* 4/

12 3 F 4 [5640] 63 29 KJ

3 [14350] 100 2 [14850] 77 21

4/12 X G 4 [21320] 58 32 3 H

Tm v ( 4 Ii5/2) Limit 3U000
YTTERBIUM

Yb I

70 electrons Z=70

Ground state (ls 2 2s 2 2p 6 3s2 3p6 3d 10 4s 2 4p6 4d 10 5s 2 5p6

) 4/ 14 6s2 'So

Ionization energy 50441.0±0.2 cm 1 6.25394±0.00003 eV

Identified even configurations 4/’ 14 6s 2

, 4/" 14 5d6s, 4/

M4 6s7s-13s, 4/ 14 6s6c?-9d, 4/ 14 6p 2

, 4/ 14 5d 2 ?, 4/ 13 6s2 6p, 4/ 13 5d6s6p

Identified odd configurations 4/ 14 6s6p-48p, 4/ 14 6s5/-7/, 4/ 14 5d6p?, 4/ 14 5d7p?,

4/ 13 5c?6s 2

, 4/ 13 5d2 6s?

A short history of the research on this spectrum by Meggers and others is given in a recent report [Meggers and Tech, 1977], the published version of which can be consulted for

details. Almost 1800 lines (2155 A to 3.13 p.m) are listed for Yb I in this paper, with nearly 800

emission lines classified by the known energy levels. In addition to the levels derived mainly

from Meggers’ analysis, we have tabulated many high odd-parity J- 1 levels obtained from

absorption spectra (see below).

g Values

Meggers and Corliss [1966] describe observations of the Zeeman effect for the Yb spectra,

and Meggers and Tech [1977] give Zeeman data for about 250 lines. Most of the g values were

derived by Meggers, with some additions due to C. E. Moore also being included in the new

tables [Meggers and Tech, 1977]. The g values for the three lowest odd levels having J= 1 are from optical double-resonance determinations. The value given for the 4/ 14 ('S)6s6p 3 P° level is an average of the results of Budick and Snir [1967] and Baumann and Wandel [1968], which

agree to within 5 units in the fifth place. Baumann and Wandel also measured the g value

listed for the 4/ 14 ('S)6s6p 4 P° level (stated error ±0.005), and the value for the 4/ 13 5d6s2

( 7

/2 , 5/2 )° level is from Budick and Snir (stated error ±0.0009).

Theoretical Interpretation

The levels of the 4/ 14 6s 2

, 4/ 14 5d6s, and 4/ 14 6s6p configurations were given by Meggers

and Corliss in their 1960 abstract, by which time some 70 higher levels had also been found

and most of the strong lines classified. The interpretation of the system of levels based on the

4/ 13 (

2 F°) core was aided by calculations by Spector, by Racah, and by Nir and Goldschmidt.

Spector collaborated with Meggers on the first searches for levels of this system, and his 1971

paper gives levels and the results of his calculations for the 4/ 13 5d6s 2 and 4/ 13 6s 2 6p

configurations. Miller and Ross [1976] independently assigned 17 even levels to the 4/ 13 5d6s6p

configuration on the basis of isotope-shift measurements.

Nir and Goldschmidt [1976] have given the detailed interpretation of the even levels belonging mainly to the 4/ 13 5d6s6p configuration. The eigenvectors for the even levels are from their calculations of the (4/

14 6s2 +4/ 14 5d6s+4/ 14 5d2 +4/ 13 6s 2 6p+4/ 13 5c?6s6p) and 4/ 14 6s6d

configurations. Second percentages less than 5% are omitted. The 4/ 13 6s2 6p and 4/ 13 5d6s6p

configurations were calculated in Jx j and J x J2 coupling schemes, respectively. In listing second

percentages from the latter configuration, we usually give only the 4/ 13 2 F° core level and the

final parent level from the 5d6s6p electrons; the intermediate 6s6p 3 P° or 'P° parent term is given only if it is different from the corresponding parent in the first percentage.
374 Yb I —Continued

The interpretation of several even levels from 47341 to 47673 cm

-1 having ,7=1, 2, or 3

appears uncertain; the assignments are given tentatively, and percentages from the

eigenvectors belonging mainly to 4/ 14 5d2 are omitted, pending the determination of more levels and g factors for this configuration. The 4/ 14 6p2 configuration probably interacts significantly

with one or more of the other even configurations, but the assignments to the 4/ 14 6p2 3 P° and

'D° terms appear to be the most likely designations for the four levels involved. These

designations are also consistent with isotope-shift data [Miller and Ross, 1976],

Nir and Goldschmidt [1974] supplied the eigenvector percentages for the two lowest odd

configurations, from their calculation of (4/

14 6s6p+4/ 13 5d6s 2

). The 4/ 13 5d6s 2 configuration was

calculated in J x j coupling; leading percentages for these levels in the /,/ coupling scheme are given by Spector [1971], Most of the remaining unidentified odd levels probably belong to the

4/ 13 5d2 6s configuration, which has not yet been calculated [Camus and Tomkins, 1969; Meggers

and Tech, 1977], This has been indicated by giving the two lowest of the otherwise unidentified

odd levels beginning near 37000 cm' 1 tentatively assigned to this configuration.

Series, Ionization Energy, Autoionizing Levels

The identifications of some members of 4/ 14 6sns, 4/ 14 6snd, and 4f

u 6snp series were made

by Nir [1970], Tech has extended some of these series and assigned the 4f

u 6snf levels [Meggers and Tech, 1977], Camus and Tomkins [1969] observed the two 4/ 14 6s2 1 S0 —4/

14 6snp

(J= 1) series in absorption over the region 1980-2300 A. The structure of the 4f

u 6snp

configurations arising from a 4/ 14 6s( 2 S 1/2 )np; coupling scheme is apparent for w=10, and we

have designated the higher series members according to this scheme. Camus and Tomkins

derived the quoted value for the 4/ 14 6s( 2 Si/2 ) ionization limit from the ( 2 Si/2 )np3/2 (V2 , %)°

series (the *P° series in LS coupling), which they observed to w=48.

Most of the levels given above the 4/ 14 6s( 2 S 1/2 ) principal limit were obtained from

photoionization resonances [Parr and Elder, 1968] or from optical absorption spectra [Kozlov,

Kotochigova, and Nikolaev, 1976]. The letter “a” is given after the positions of these ,7=1 levels, to indicate autoionization broadening. The levels from Parr and Elder are rounded off to the nearest 10 or 100 cm -1

, depending on the width. The value of Kozlov et al. for the very wide

level near 55400 cm

-1 is also rounded off, and the level they derive as a separate component of

this resonance (at 54700 cm 1 ) is given tentatively. Parr and Elder give some additional levels derived from weaker resonances that are not listed here. The tentative assignments to 4/ 14 5d6p and 4/ 14 5d7p terms are due to Parr and Elder; additional assignments are omitted

here, pending calculation of the complex absorption structure in this region.

References

Baumann, M., and Wandel, G., Phys. Lett. 28A, 200 (1968). ZE

Budick, B., and Snir, J., Phys. Lett. 24A, 689(1967). Hfs ZE

Camus, P., and Tomkins, F. S., J. Phys. (Paris) 30, 545 (1969). EL CL IP Humphreys, C. J., and Paul, E., Jr., Quarterly Report Foundational Res. Projects, NAVORD Report 5970, NOLC

Report 473, 57 pp. (1959). W

King, A. S., Astrophys. J. 74, 328 (1931). W

Kozlov, M. G., Kotochigova, S. A., and Nikolaev, V. N., Opt. Spectrosc. (USSR) 41, 4 (1976). EL CL W

Meggers, W. F., and Corliss, C. H., J. Opt. Soc. Am. 50, 1136A (1960). EL ZE

Meggers, W. F., and Corliss, C. H, J. Res. Nat. Bur. Stand. (U.S.) 70A, 63 (1966). W

Meggers, W. F., Corliss, C. H., and Scribner, B. F., Tables of Spectral-Line Intensities, Nat. Bur. Stand. (U.S.) Monogr.

145, Part 1, 403 pp. (1975). CL

Meggers, W. F., and Scribner, B. F., J. Res. Nat. Bur. Stand. (U.S.) 19, 651 (1937). EL CL W

Meggers, W. F., and Tech, J. L„ preprint entitled “The First Spectrum of Ytterbium (Ybl)” (1977). This paper will be submitted for publication in J. Res. Nat. Bur. Stand. (U.S.), EL CL W ZE

Miller, G. E., and Ross, J. S., J. Opt. Soc. Am. 66, 585 (1976). ND IS

Nir, S., J. Opt. Soc. Am. 60, 354 (1970). EL ND

Nir, S., and Goldschmidt, Z. B., unpublished material (1974, 1976). ND PT

Parr. A. C„ and Elder, F. A., J. Chem. Phys. 49, 2665 (1968). EL CL

Reader, J., and Sugar, J., J. Opt. Soc. Am. 56, 1189 (1966). IP

Spector, N., J. Opt. Soc. Am. 61, 1350 (1971). EL ZE PT

[May 1977]
375

Yb I, Even Parity

Configuration Term J

Level (cm -1

) 9 Leading percentages

4/ 14(

1 S)6s2 4 S 0 0.000 99

4/ 14(

1 S)5tf6s 3D 1 24489.102 0.50 99 2 24751.948 1.16 97 3 25270.902 1.34 99

4/ 14

(

1 S)5t/6s !D 2 27677.665 1.01 95

i3(2p°/2)6s 2 6p 1/2 ( 7/2,V2) 3 32065.282 1.23 89 4 32273.597 92

4/ 14(

1 S)6.s7.s 3S 1 32694.692 2.01

4/ 14( 1 S)6s7s X S 0 34350.65

4/ 13( 2F7/2)6s2 6^3/2 ( 7

/ 2, 3

/ 2 ) 5 35178.78 93 2 35196.98 1.05 92 3 35807.52 1.08 88 5 ( 2 F7/2) ( 7

/2,

1 /2) 4 36060.98 92

4/ 14(

1 S)6s6d 3 D 1 39808.72 0.50 100 2 39838.04 1.16 86 14 3 39966.09 1.33 100

4/ 13( 2Ft/2) 5c/( 2 D)6s6p(3P°) ( 4 F3/2) ( 7

/2,3/2) 2 39880.26 1.83 61 25 ( 2 F7/2)(4 FI/2) ( 7

/ 2, 3

/ 2 ) 5 42935.78 0.89 80 9 ( 2 F7/2)(4FI/2) ( 7

/ 2,S /2) 4 44984.75 1.08 54 12 ( 2 F7/2)(2 D3/2) ( 7

/ 2, 3

/2) 3 45462.54 1.20 41 17 ( 2 F7/2)(2 Dl/2) ( 7

/2,

1 /2)

4/14

(

1 S)6s6(f 2 40061.51 1.03 86 14 3 D

4/ 14

(

1 S)6s8s 3S 1 41615.04 2.02

4/ 13( 2 F?/2 ) 5cf( 2D)6s6p( 3P

0

) ( 4 Fg/2) 3 41827.30 1.52 30 ( 7/2, 5

/ 2 ) 28 ( 2 F7/2)(4F§/2) ( 7/2,3/2)

4/ 14

(

1 S)6s8s 0 41939.90

4/ 13

(2Ft/2) 5c/( 2D)6s6p(3P°) ( 4FI/2) ( 7

/2, 5/2) 1 42436.70 1.73 57 11 ( 2F7/2)( 2D5/2) ( 7

/2,5/2)

4/ 14

(

1 S)6p2 3 P 0 42436.91

1 43805.42 1.47 2 44760.37 1.34

4/ 13(2F5/2)6s2 6pi/2 ( 5/2,V2) 3 92 2 42531.87 1.01 89

4/ 13

( 2Ft/2) 5c/( 2D)6s6p(3P°) ( 4 Fs/2) 2 43224.78 1.34 22 ( 7/2,5/2) 18 ( 2F7/2)( 4 F7/2) ( 7

/2,7

/ 2)

4/13

( 2F?/2) 5(/( 2D)6s6p(3P°) ( 4 Fs/2) ( 7

/2,5/2) 6 43814.11 1.08 78 7 ( 2F7/2)(2 DS/2) ( 7

/ 2,5

/ 2 )

4/ 13

( 2Ft/2) 5(f( 2D)6s6/X 3P°) ( 4 FI/2 ) 4 44232.66 1.48 20 ( 7

/2,5

/ 2 ) 16 ( 2 F7/2)(4 F?/2) ( 7

/2, 7/2)

4/ 14

(

1 S)6s7tf 3 D 1 44311.38

2 44313.05 3 44380.82 1.32

4/ 14

(

1 S)6s7t/ >D 2 44357.60 1.10

4/ 13

( 2 F?/2) 5c/( 2D)6s6p(3P°) ( 4 Ft/2) 3 44713.12 1.39 24 ( 7

/ 2, 7/ 2 ) 13 ( 2 F?/2)(4 F§/2) ( 7/2,3

/ 2 )

4/ 13 (2F5/2 )6s2 6/)3/2 ( 5

/2,3/2) 1 44834.61 0.66 87 4 45497.62 89 2 45913.86 88 3 88

4/ 14

(

1 S)6s9s 3S 1 45121.37 1.98

4/ 13

( 2F?/2) 5(/( 2D)6s6/X3 P°) ( 2 Ds/2) 2 45338.53 1.30 38 ( 7

/2,5/2) 23 ( 2 F7/2)(4 F!/2) ( 7

/2, 7/ 2 )

4/ 13

( 2 Ft/2) 5t/( 2D)6s6p(3P°) ( 4 FI/2) 5 45410.91 1.17 40 ( 7

/2, 3

/ 2) 18 ( 2F7/2)(4 D3/2) ( 7

/2,3

/2)
376

Yb I, Even Parity—Continued

Configuration Term J

Level (cm ') 9 Leading percentages

4/ 13

( 2F7/2 ) 5<7( 2D)6s6p(3P°) ( 4 Ft/2) ( 7

/2, 7/2) 1 45595.14 1.19 47 20 ( 2F7/2)( 2 D§/2) ( 7

/ 2, s/ 2 )

4/ 13

( 2F?/2) 5<7( 2D)6s6p(3P°) ( 4 FI/2) 4 45775.68 1.14 39 ( 7

/ 2, 5

/ 2 ) 15 ( 2F!/2)(2 DS/2) ( 7

/2,s

/2 )

4/ 13

( 2F?/2 ) 5tf( 2D)6s6p(3P°) ( 4Ft/2) ( 7

/2, 7/2) 0 46081.54 79 11 ( 2F?/2)( 2F?/2) ( 7

/2, 7

/ 2 )

4/ 13

( 2Ft/2) 5t/( 2 D)6s6p( 3P°) ( 4 D!/2) 3 46395.60 1.35 27 ( 7/2,

1 /z) 26 ( 2F?/2)( 4 Fg/2) ( 7

/ 2, 5

/2 )

4/ 13( 2F?/2) 5tf( 2 D)6s6p( 3P°) ( 4 F§/2) 2 46431.49 25 ( 7

/ 2, 3/ 2 ) 23 ( 2 F7/2)( 4 F5/ 2 ) ( 7

/2 , 5/ 2 )

4/ 14

(

1 S)6s8rf 3 D 1 46444.96 0.49 2 46467.70 1.12 3 46480.65 1.35

4/ 13( 2 F7/2) 5tf( 2D)6s6p(3P°) ( 4 P§/2 ) 6 46554.81 1.25 32 ( 7

/2,5

/ 2 ) 30 ( 2 F?/2)(4 DS/2) ( 7

/ 2, s/ 2 )

4/ 14( 1 S)6sl0s 3S 1 46877.10

4/ 13( 2F7/2 ) 5d( 2D)6s6p(3P°) ( 2 Dg/2) ( 7/2,5

/ 2 ) 6 47036.62 1.18 46 20 ( 2 Ft/2 )( 4 Ft/ 2 ) ( 7

/ 2j 7

/ 2 )

4/ 13( 2 F?/2) 5t/( 2D)6s6p(3P

0

) ( 4 D!/2 ) ( 7/2,V2) 4 47047.69 0.86 63 8 ( 2F7/2 )( 4 F3/2 ) ( 7

/ 2, 3/ 2 )

4/ 13

( 2 F7/2) 5t/( 2D)6s6p( 3P°) ( 4 DS/2) ( 7

/ 2,3

/ 2 ) 5 47088.16 1.16 54 13 ( 2F7/2)( 4F7/2 ) ( 7

/ 2, 7/ 2 )

4/ 14( 1 S)5c/2 ? 2 47341.82

4/ 14(

1 S)6s9d? J D? 2 47420.96 1.04

1 47584.34 0.73

4/ 14

(

1 S)5d2?3 F? 2 47634.41

4/ 13

( 2F7/2) 5t/( 2 D)6s6p(3P°) ( 4 FI/£) 5 47636.11 1.09 25 Cl2,5

/ 2 ) 21 ( 2 F7/2 )( 2 D3/2) ( 7

/ 2, 3/2)

4/ 13( 2 F7/2) 5c/( 2D)6s6p( 3P°) ( 4 FI/2)? 1 47645.40 35 Cl2, s

/ 2 ) 24 ( 2 Ft/2 )( 2 Ds/2 ) ( 7/ 2, s

/ 2)

3 47646.62 1.32

4/ 13( 2F?/2) 5t/( 2D)6s6p(3P

0

) ( 4D§/2 )? 3 47673.45 42 Ch,3

l 2 ) 27 ( 2 Ft/2 )( 4 Di/2 ) ( 7/ 2, 1 / 2)

4/ 13

( 2 F7/2 ) 5tf( 2 D)6s6p(3P°) ( 4 Da/2 ) ( 7

/ 2, 3

/ 2 ) 4 47673.71 54 11 ( 2F7/2)(2D§/2) ( 7

/ 2, 5/ 2)

4/ 13( 2 F7/2) 5c/( 2D)6s6p(3P°) ( 4 F!/2 ) ( 7

/ 2,

7

/ 2 ) 4 47772.94 1.22 47 13 ( 2F7/2)(4F§/2) ( 7/2 , 5/ 2 )

4/ 14

( 1 S)6p2

? 'D? 2 47821.78 1.04

4/ 14

(

1 S)5t/2

?

3 F? 3 47860.28 1.02

4/ 14(

1 S)6slls 3S 1 47885.81

4/ 13( 2 F7/2) 5t/( 2D)6s6p(3P°) ( 2 Da/2) ( 7

/2, 3

/ 2 ) 5 47911.48 1.21 46 12 ( 2Ft/2)( 4 DS/2 ) ( 7

/ 2 , 5/ 2)

4/ 13

( 2F7/2) 5d( 2D)6s6p(3P°) ( 4 F?/2 ) ( 7

/2j 7

/ 2 ) 5 48057.77 1.13 70 7 ( 2F?/2)( 2 D§/2) ( 7

/ 2 , 5/ 2 )

4/ 13

( 2F?/2 ) 5cf( 2D)6s6p(3P°) ( 2Da/2) ( ?

/ 2, 3

/ 2 ) 2 48135.60 1.37 50 6 ( 2 F7/2) OP”) ( 2 D3/2 ) ( 7/2 , 3/

1 48309.41

1 48357.54

1 48360.43

4/ 14(

1 S)6sl2s 3 S 1 48519.71

4/ 13( 2 F?/2) 5(f( 2D)6s6p( 3P°) ( 4 D§/2 ) 3 48647.78 36 ( 7

/2, 5

/ 2 ) 19 ( 2 F7/2)( 4FI/2) ( 7

/ 2 , 9/ 2)

4/ 13( 2F7/2 ) 5t/( 2D)6s6p(3P°) ( 4 F7/2 ) ( 7

/2» 7

/ 2 ) 6 48688.18 55 29 ( 2F7/2 )( 4 D5/2 ) ( 7

/ 2, 5

/ 2 )

4/ 13( 2F7/2 ) 5tf( 2D)6s6p(3P°) ( 2 Ds/2 ) ( 7

/2,5/2) 4 48787.71 1.21 45 13 ( 2 F?/2)( 4 DS/2 ) ( 7

/ 2, 5/ 2)

4/ 13

( 2 F?/2 ) 5t/( 2D)6s6p(3P°) ( 4 D?/2) ( 7

/2, 7/ 2 ) 6 48806.57 1.22 47 14 ( 2 Ft/2)( 4PI/2 ) ( 7

/ 2, s

/ 2)
377

Yb I, Even Parity—Continued

Configuration Term J

Level (cm ‘) 9 Leading percentages

4/ 13( 2 Ft/2) 5d( 2D)6s6p( 3P°) ( 4FI/2) ( 7

/2, 9/2) 1 48838.33 72 11 (2F7/2 )( 4 F7/2) ( 7

/ 2,7

/2)

4/ 13( 2F?/2 ) 5(f( 2D)6s6p(3P°) ( 4 Fs/2 ) 2 48883.11 44 ( 7/2,9/2) 33 ( 2 F7/2)(4 DI/2) ( 7/ 2, 3/ 2)

4/ 14(

1 S)6sl3s 3 S 1 48943.42

4/ 13( 2 F?/2 ) 5c?( 2D)6s6p( 3P°) ( 4DI/2 ) 5 49079.34 41 ( 7

/2,5

/2) 23 ( 2 F7/2)(2 D§/2) ( 7/ 2,^/2)

4/ 13

( 2Ft/2) 5c/( 2D)6s6p(3P

0

) ( 2 Da/2 ) 4 49103.64 1.04 40 ( 7

/ 2 31 2 ) 15 ( 2 F7/2)( 4 D§/2) ( 7

/ 2 , 5

/ 2)

4/ 13( 2Ft/2) 5d(2D)6s6p( 3P°) ( 4 F§/2 ) 3 49223.35 1.32 19 ( 7

/2, 9

/2 ) 14 ( 2 F7/2 )( 2 D§/2) ( 7

/ 2 , 5/2)

4/ 13( 2F?/2) 5tf( 2 D)6s6p(3P°) ( 4F§/2) 2 49246.79 20 ( 7

/ 2, 9

/2 ) 18 ( 2 F7/2 )( 2DI/2) ( 7

/2, 5/2)

4/ 13

( 2Fv/2) 5d(2D)6s6p(3P°) ( 4 D?/2) 4 49260.75 1.20 24 ( 7

/ 2, 7

/2) 20 ( 2 F7/2)(4 P3/2) ( 7/ 2,3

/ 2 )

4/ 13( 2 Ft/2) 5d( 2D)6s6p(3P°) ( 2 Da/2 ) 3 49444.52 23 ( 7

/ 2 3

/ 2) 17 ( 2 F7/2)( 4 D§/2) ( 7

/ 2, 3

/2 )

4/ 13( 2Ft/2) 5c/( 2D)6s6p(3P°) ( 4 D?/2) 5 49638.73 36 ( 7

/2, 7

/

) 22 ( 2 F7/2)(4 D5/2) ( 7

/ 2 , 5/ 2 )

Yb II ( 2 Si/2 ) Limit 50441.0

4/ 13( 2F7/2) 5c/( 2D)6s6p(3 P°) ( 4P§/2) ( 7

/2, 5/2) 6 52874.79 1.13 45 21 ( 2F7/2 )( 4 F9/2) ( 7

/2,9

/ 2)

4/ 13( 2F?/2) 5d(2D)6s6p(3P°) ( 2P§/2 ) 5 54718.25 37 ( 7

/ 2, 3/ 2 ) 15 ( 2Ft/2)( 2 F?/2) ( 7

/ 2, 7

/ 2)

4/ 13( 2F§/2 ) 5c/( 2D)6s6p( 3P°) ( 2 DI/2) 5 57429.68 1.11 16 ( 5

/2,5/2) 15 ( 2 F?/2) ('P

0

) ( 2D§/2) ( 7

/2, 5/2)

6 57432.05 1.16

5 57480.54 1.13

4/ 13( 2F7/2 ) 5(/( 2D)6s6p( 1 P

0

) ( 2 F?/2) 4 58732.06 1.14 31 ( 7

/ 2, 7/ 2) 9 ( 2 F7/2 ) ( 3 P°) ( 2 FI/2) ( 7

/ 2,^/2)

5 58911.39 1.09

4/ 13

( 2 Fs/2) 5tf( 2 D)6s6p(3 P°) ( 2 D!/2) 4 59081.36 24 ( 5

/2,5

/2) 22 ( 2 F5/2)(4D§/2 ) ( 5/2, 5

/ 2)

2 59377.13

5 61384.00

2 64178.70 1.02 Yb II ( 2 F!/2) Limit 71859.7

2 72190.20

225-298 0 - 78 - 25
378

Yb I, Odd Parity

Configuration Term J

Level (cm -1

) 9 Leading percentages

4/ 14

(

1 S)6s6p 3p° 0 17288439 100

1 17992.007 1.49282 98 2 19710.388 1.50 100

4/’ 13

( 2 F7/2 )5c/3/2 6s2

( 7

/2,3

/ 2

)° 2 23188.518 1.45 79 5 25859.682 1.04 96 3 27U5.638 1.22 92 4 28185.512 1.14 90

4/ 14

(

1 S)6s6p ipo

1 25068.222 1.035 73

4f 13

( 2F7/2 )5c/5/ 2 6s2

( 7

/2, 5/2)° 6 27315-919 1.16 100 2 28195.960 1.02 80

1 28857.015 1.2635 48 22 ( 2 F§/2) ( 5

/ 2 , 3/ 2) 4 29775.958 1.09 90 3 30207.380 1.08 91 5 30525.715 1.18 96

4/ 13( 2F°)5t/2 6s? 1 37515-59 1.02

4/ 14( 1 S)6s7p 3p° 0 38090.71

1 38175.17 1.14 2 38551.93 1.50

4/ 13

( 2F°)5tf2 6s? 1 38522.36 1.07

4/ 14( 1 S)6s7p ip° 1 50563.97 1.01

2 52657.72 1.25

2 52725.76 1.02

3 53255-78 1.06

3 53297.51 1.03

4/ 14(

1 S)6s5/ 3jr° 2

Q 53533.85 0.68

4

1 53532.77 1.54

4/ 14(

1 S)6s8p 3p° 0 53615.27

1 53659.38 1.48 2 53805.69 1.49

3 53815.67 1.21

4/ 14(

1 S)6s8p ip° 1 5501 7.60 1.00

2 55251.88 1.38

4? 55392.70

3 55553.57 1.10

2 55155.33 0.98

1 55181.69 1.28

4/ 14( 1 S)6s6/ 3 jr° 2 55956.27 0.72

4/ 14(

1 S)6s9p 3p° 1 56078.91 1.34 0 56082.1

7

2 56185.15 1.50

1 56175.21 1.22

3 56251.06 1.15

4/ 14(

1 S)6s9p ip° 1 56370.30 1.07

2 5 7055.05 1.08
379

Yb I, Odd Parity—Continued

Configuration Term J

Level (cm ') 9 Leading percentages

3? ±7325.19

4/ 14

(

1 S)6s7/ 3 p° 2 ± 7326.65

1 ±7332.26 0.95

4/

14

(

1 S)6s( 2 Si/2 ) 10pi/2 (V^Va) 0 0 ±7±09.82

1 ±7±20.93 1.36

4/

14

(

1 S)6s( 2S 1 / 2) 10p3/ 2 W/a)

0 2 ±7±71.10

1 ±7±98.83 1.03

3? ±78±3.13

1 ±7859.31 1.30

4 ±7939.10

3 ±815±.71

4/

14

(

1 S)6s( 2Si/2)llpi/ 2 (V2J/2)

0 0

1 ±8212.10

4/

14

(

1 S)6s( 2Si/2)llp3/2 (

X / 2, 3

/ 2)

0 2

1 ±8258.±7

2 ±823±.12

3 ±8237.39 1.24 2 ±832±.89 2 ±8±±9.27 1.15 3 ±8±87.98 1.23 2 ±8701.60

4/

14

(

1 S)6s( 2Si/2 ) 12pi/ 2 O/a.Va) 0

1 ±8719.03

4/

14

(

1 S)6s( 2Si/2 ) 12p3/2 (

1 /2, 3

/ 2

)° 1 ±8761.8

2 ±8965.16

1 ±9005.7

4/ 14

(

1 S)6s( 2 Si/2)13pi/2 ( 1

/2, 1 /2

)° 1 ±9110.07

l/ 14

( 1 S)6s( 2Si/2)13p3/2 (

1 /2, 3

/2

)° 1 ±9127.38

4 ±9282.36

4/ 14(

1 S)6s( 2 Si/2)14pi/2 1 ±9352.±7

4/ 14

( 1 S)6s(2Si/2)14p3/2 ( 1

/2, 3

/ 2

)° 1 ±9360.60

4/ 14(

1 S)6s(2 Si/2)15pi/2 O/a^/a) 0 1 ±9536.±3

4/ 14

( 1 S)6s( 2Si/2)15p3/2 (

1

/ 2, 3/ 2

)° 1 ±95±6.55

4/ 14

(

1 S)6s( 2Si/2)16pi/2 (

1 /2 , 1 / 2 )° 1 ±9677.59

4/ 14

(

1 S)6s( 2Si/2)16p3/2 (

1 / 2, 3

/ 2 )° 1 ±9688.55

4/ 14(

1 S)6s( 2Si/2 )17pi/2 Wh)0 1 ±9786.39

4/ 14

(

1 S)6s( 2Si/2 )17p3/2 (

1 / 2, 3

/ 2

)° 1 ±9799.20

4/ 14

(

1 S)6s( 2Si/2 )18p3/2 (

1 /2, 3

/2

)° 1 ±9867.13"!

1 ±9920.15

4/ 14

(

1 S)6s(2Si/2)19p3/2 (

1 / 2 , 3

/ 2

)° 1 ±9969.10

4/

14

(

1 S)6s( 2Si/2 )20pi/2 (

1 / 2 , 1 /2

)° 1 50016.08

4/ 14

(

1 S)6s( 2S i/ 2 )20p3/2 (V2, 3

/2

)° 1 50021.23
380

Yb I, Odd Parity—Continued

Configuration Term J

Level (cm ')

4/ 14

(

1 S)6s( 2Si/2)21pi/2 (Va.Va)

0 1 50064-05

4/ 14

(

1 S)6s( 2 Si/2)21J03/2 (V2,

3/2)° 1 50067.64

4/ 14(

1 S)6s( 2 Si/2)22pi/2 (

1 /2,

1 /2)° 1 5010L49

4/ 14

(

1 S)6s( 2Si/2)22/?3/2 ( 1 /2,3/2)° 1 50107.50

4/ 14

(

1 S)6s( 2Si/2)23pi/2 PMa)0 1 50138.83

4/ 14( 1 S)6s( 2Si/2)23p3/2 (V2,3/2)° 1 50141.52

4/ 14

(

1 S)6s( 2Si/2)24pi/2 (x h, x h)° 1 50168.24 4/ 14

( 1 S)6s( 2 Si/2)24p3/2 whr 1 501 70.60

4/ 14(

1 S)6s( 2 Si/2 )25pi/2 (v^r 1 50193.50 4/ 14

(

1 S)6s( 2 S i/ 2)25p3/2 (V2,3/2)° 1 50195.76

4/ 14( 1 S)6s( 2Si/2)26p3/2 (V2,3/2)° 1 50217.49

4/ 14

(

1 S)6s( 2Si/2)27p3/ 2 (V2,3/2)° 1 50236.51

4/ 14

(

1 S)6s( 2Si/2)28p3/2 ( 1/2,3/2)° 1 50253.22

4/ 14(

1 S)6s( 2 Si/2)29p3/2 ( 1 /2,3/2)° 1 50268.05

4/ 14(

1 S)6s( 2 Si/2)30p3/2 (

1 /2,3/2)° 1 50280.84 4/ 14

(

1 S)6s( 2 Si/2)31p3/2 (1 /2, 3

/ 2

)° 1 50292.45 4/ 14

(

1 S)6s( 2Si/2)32p3/2 Wk)0

1 50303.00 4/ 14

(

1 S)6s( 2Si/2)33p3/2 (

1 /2,3 /2)° 1 50312.19 4/ 14

(

1 S)6s( 2Si/2 )34 p3/2 (V2 3/2)° 1 50320.44 4/ 14

( 1 S)6s( 2Si/2)35p3/2 (V2 3/2)° 1 50328.27 4/ 14

(

1 S)6s( 2S i/ 2)36p3/2 (1 /2,3 /2)° 1 50335.15 4/ 14

(

1 S)6s( 2Si/2)37p3/2 (1 / 2, 3

/ 2 )° 1 50341.36 4/ 14

(

1 S)6s( 2Si/2)38p3/2 (1 /2,3/2)° 1 50347.15 4/ 14

(

1 S)6s( 2Si/2)39p3/2 (V2,3/2)° 1 50352.42 4/ 14

(

1 S)6s( 2 Si/2)40p3/2 (1 / 2, 3

/ 2

)° 1 50357.21 4/ 14

(

1 S)6s( 2 Si/2 )41p3/2 (1/2,3/2)° 1 50361.74 4/ 14

(

1 S)6s( 2Si/2)42p3/2 (V2 3/2)° 1 50365.83 4/ 14

(

1 S)6s( 2Si/2)43p3/2 (

1 /2,3/2)° 1 50369.62 4/ 14

(

1 S)6s( 2Si/2)44p3/2 (V2,3/2)° 1 50373.20 4/ 14

(

1 S)6s( 2 Si/2)45p3/2 (1 /2,3/2)° 1 50376.41 4/ 14

(

1 S)6s( 2Si/2)46p3/2 ( 1/2,3/2)° 1 50379.40 4/ 14

(

1 S)6s( 2Si/2)47p3/2 (V2,

3/2)° 1 50382.20 4/ 14

( 1 S)6s( 2S i/2)48p3/2 (

1 /2,3/2)° 1 50384-86

Yb II ( 2 Si/2) Limit 50441.0

4/ 14(

1 S)5<76p? 3D°? 1 51 797a

4 52540.35 4/ 14

(

1 S)5t/6p? 3p°? 1 53276a

1 54042a

1 54407a

1 54700a?

4/ 14

(

1 S)5tf6p? ip°? 1 55400a

1 59451a

1 59730a

5 60053.78

1 60100a

Leading percentages
381

Yb I, Odd Parity—Continued

Configuration Term J

Level (cm ') 9

Leading percentages

l 61 520a

l 62200a

5 6230846

5 62395.51 1.10 6 6268740

4/ 14

(

1 S)5c/7p? 3 D°? 1 63050a

4/ 14(

1 S)5(/7/?? 3p°? 1 63650a

5 6367248

4/ 14

( 1 S)5(/7p? 1 P°? 1 65500a

1 67310a

6 67855.35

1 68790a

1 69900a
382

Yb ii

(Tm i sequence; 69 electrons) Z=70

Ground state (ls 2 2s2 2p6 3s 2 3p6 3d 10 4s 2 4p6 4d 10 5s 2 5p6

) 4/ 14 6s 2 S 1/2

Ionization energy 98269± 50 cm -1 12.184± 0.006 eV

Identified even configurations 4/ 14 6s-8s,10s, 4/ 14 5d-lld, 4/ 13 6s6p, 4/ 13 5d6p, Af u

5gfig

Identified odd configurations 4/ 13 6s 2

, 4/ 13 5c?6s, 4/ 14 6p,7p, 4/ 13 5d2

, 4/ 14 5/-14/

The papers by Meggers and Corliss [1966] and by Meggers [1967, edited by C. E. Moore]

give detailed histories of work on this spectrum. The levels are mainly from Meggers’ tables

[1967], supplemented by the 4f

unl series members analyzed by Kaufman and Sugar [1973],

The latter authors also derived the quoted ionization energy.

The relative completeness of the analysis and theoretical interpretation is due to a full collaboration between Meggers and coworkers at NBS and Racah and his group at the Hebrew

University, Jerusalem. The first calculations of Yb II by Racah and his students [Racah, 1954; 1960] were important not only for extension of the analysis but as early examples of J X J2 and

J x L2 coupling schemes also appropriate for some other rare-earth spectra. The eigenvector

percentages given here are from later calculations by Racah and Goldschmidt including

configuration interactions: (4/

13 5d6p+4/'3 6s6p) and (4/13 6s 2 +4/ 13 5d6s+4/ 13 5d2

). Spector [1968] discusses the 4/ 13 5d2 configuration, including theoretical results in the

single-configuration approximation. One of the levels previously assigned to this configuration

is now designated 4/ 14 7p 2 P°/2 (65594 cm

-1

), following Kaufman and Sugar.

Kaufman and Sugar’s reassignments of two even levels near 76500 cm

-1 to 4/ 14 7d 2 D are given tentatively, as are our correlations of the two levels formerly designated Id 2 D with

calculated levels of 4/ 13 5d6p. No calculations that include the one-electron series have been

carried out for either parity.

The Yb line list of Meggers and Corliss [1966] has more than 5000 lines assigned to Yb ii (2018-11559 A), and Meggers [1967] was able to classify about 4000 of these, including

practically all of the strong lines. Kaufman and Sugar classified about 30 additional lines from

the list as belonging to one of the 4f

u nl series. The extension of the observations down to 1377 A gave about 280 additional Yb n lines, a number of which also belong to the nl series

[Kaufman and Sugar, 1973].

Meggers and Corliss describe the main observations of the Zeeman effect for Yb. The g

values of more than 250 levels have been derived from the measurements of more than 1000

Zeeman patterns [Meggers, 1967],

References

Allen, L., United Kingdom Atomic Energy Authority, Res. Group Report, AERE-R 4029, 34 pp. (1962). W ZE

Goldschmidt, Z. B., Thesis, Hebrew Univ., Jerusalem, Israel, 487 pp. (1968). ND PT

Humphreys, C. J., and Paul, E., Jr., Quarterly Report Foundational Res. Projects, NAVORD Report 5970, NOLC

Report 473, 57 (1959). W

Kaufman, V., and Sugar, J., J. Opt. Soc. Am. 63, 1168 (1973). EL ND CL W ZE IP

King, A. S., Astrophys. J. 74, 328 (1931). W

Meggers, W. F., J. Opt. Soc. Am. 37, 988A (1947). EL IP Meggers, W. F, (Edited by C. E. Moore), J. Res. Nat. Bur. Stand. (U.S.) 71A, 396 (1967). EL CL W ZE IP Meggers, W. F., and Corliss, C. H., J. Res. Nat. Bur. Stand. (U.S.) 70A, 63 (1966). W ZE

Meggers, W. F., and Scribner, B. F., J. Res. Nat. Bur. Stand. (U.S.) 19, 651 (1937). EL CL W

Parr, A. C., and Inghram, M. G., J. Chem. Phys. 52, 4916 (1970). IP

Racah, G., Lunds Univ. Arssk., Avd. 2, 50, 31 (1954). Racah, G., J. Opt. Soc. Am. 50, 408 (1960). EL ND ZE

Racah, G., Goldschmidt, Z. B., and Bordarier, Y., unpublished calculations (1965). (Obtained from Goldschmidt, private

communication, 1974.) ND PT

Spector, N., J. Opt. Soc. Am. 58, 837 (1968). EL ND ZE PT

[October 1976]
383

Yb II, Even Parity

Configuration Term J

Level (cm -1

) 9 Leading percentages

4/ 14

(

1 S)6s 2 S

1 h 0.00 1.998

4/14(

1 S)5d 2 D 3

/

22960.80 1.802

5

/ 24332.69 1.202

4/ I3( 2 F?/2 )6s6p(3 P3) ( 7

/ 2 ,0) 7/

47912.31 1.280 85 10 ( 2 F?/2 )( 3P?)

4/13

( 2 F?,2 )6s6p(3P?) ( 7 /2,l) 7

/

48900.41 1.0 82 11 ( 2F7/2 )( 3Po)

9

/

49301.16 1.187 89 5 ( 2F?/2)(

1 P!)

5 /2 49498.04 1.145 83 6 ( 2F?/2 )(

1 Pi)

4/13( 2 F?/2 )6s6p(3PS) ( 7 /2,2) n/2 52517.35 1.27 95 4 ( 2 F?/2 )5rf6p(3 P§)

3

/52938.01 0.877 95 4 ( 2 F7/2 )5rf6p(3P2 ) 5 /2 53404.96 1.033 89 5 ( 2 F?/2 )( 3 P5)

7

/

53715.26 1.181 93 4 ( 2F7/2)5d6p(3 P2 ) 9/2 53720.71 1.26 95 4 ( 2F?/2 )5d6p(3P2)

4/ 14(

l S)7s 2 S V2 54304.30 2.001

4/ 13

( 2 F?/2 )5d6p(3FS) ( 7 /2,2) 3

/2 55702.07 1.693 76 8 ( 2 F?/2 )(3 F§)

5

/

58823.58 1.266 36 20 ( 2 F?/2 )6s6p(>Pf)

n/2 58961.37 0.974 74 21 ( 2F?/2 )(

1 D2 ) 7

/

61051.06 1.18 64 18 ( 2 F?/2 )(

x D§)

9

/2 61214.66 1.07 54 30 ( 2 F?/2 )(

x D§)

4/13( 2 F?/2 )5d6p( 1 P?) 5

/2 56375.91 1.226 24 ( 7/2,l) 22 ( 2F7/2 )6s6p( 1 P!)

4/13

( 2 F?/2 )6s6p( 1 P!) ( 7

/ 2,1) 9/57765.32 1.12 45 36 ( 2 F7/2 )5d6p( 1 Pi)

4/ 13

( 2 Fi/2 )6s6p(3P8) ( 5

/2,0) 5/2 58283.91 0.77 87 5 ( 2 FI/2 )( 3Pi)

4/13

( 2 F?/2 )6s6p( 1 P?) 7/2 59090.13 1.122 36 ( 7 /2,l) 25 ( 2 F7/2 )5rf6p( 1 P!)

4/13

( 2 F§/2 )6s6p(3 P?) ( 5/ 2,1) 5

/59259.24 1.105 78 6 ( 2F§/2 )( 3 Po)

7

/

59618.90 1.00 65 15 ( 2F?/2 )(

x P!)

3

/

59710.65 0.82 82 5 ( 2 F§/2 )(

x P?)

4/i3(2 F7/2 )5d6p(3 F3) ( 7 /2,3) 3

/

60586.46 1.323 45 33 ( 2F?/2 )(

x D§)

*/2 61120.49 1.661 75 6 ( 2 FI/2)(3 FS)

13

/ 2 61873.40 1.10 91 6 ( 2F?/2 )( 3 DS)

5

/2 64055.82 1.108 35 25 ( 2 F7/2 )( 3 Dl)

9

/

64923.11 1.10 83 6 ( 2F?/2 )( 3Pi)

7 /2 65093.14 0.973 37 20 ( 2 F7/2 )( 3 D2)

1 1/2 66082.25 1.141 55 36 ( 2F?/2 )(3 D2 )

4/13

( 2 F?/2 )5d6p( 1 DS) 5/2 61374.49 1.299 32 ( 7 /2,2) 21 ( 2 F7/2)( 3 FS)

4/13

( 2 F7/2 )5d6p(3 D2 ) 7/

61822.58 1.327 23 ( 7 /2,2) 13 ( 2 F7/2)( X D2)

4/13( 2 F§/2 )6s6p(3PS) ( 5

/2,2) l /2 62136.94 0.08 90 4 ( 2 F§/2 )5d6p(3 P§)

3

/

63011.85 0.79 77 5 ( 2 F§/2 )5d6p(3 P§)

9

/2 63163.79 1.12 91 4 ( 2F§/2 )5d6p(3 P2) 5

/2 63702.32 1.07 84 4 ( 2F7/2 )5d6p(3 F8)

? /2 63957.80 1.148 90 4 ( 2F5/2 )5d6p(3 P2)

4/14

(

x S)6d 2 D 3

/

62174.10 0.80

5h 62559.02 1.22

4/ 13

( 2 F?/2 )5d6p( 1 D3) 111

62861.27 1.140 44 ( 7/2,2) 18 ( 2F7/2)(3P2 )

4/13

( 2 F?/2 )5d6p(3 D?) ( 7

/ 2,1)

S

/2 63234.11 1.208 31 24 ( 2F?/2 )(3 F2 ) 9

/

63726.83 1.005 68 14 ( 2F7/2)( 1 D2 ) 7 /2 64598.28 1.223 44 19 ( 2F?/2)(3 F§)

4/13

(2 F?/2 )5d6p( x Di) 3/

63647.73 1.149 29 ( 7/2,2) 15 ( 2F?/2 )( 3 F§)
384

Yb II, Even Parity—Continued

Configuration Term J

Level (cm -1

) 9 Leading percentages

4/ 13( 2 F$/2)5d6p(3 DS) ( 7

/ 2 ,2) n/2 63944.18 1.115 33 33 ( 2 F?/2)(3 F3)

3 /2 64461.08 1.176 51 10 ( 2 F7/2)(3 F3)

9

/2 65950.95 1.09 65 14 ( 2 F7/2)( 1 D2 ) 5

/2 66351.21 1.125 72 7 ( 2 F7/2)(3 F3)

7 /2 66558.00 1.100 30 24 ( 2 F7/2)(3 D3)

4/ 13( 2 F?/2 )5d6p(3 F3) ( 7 /2,4) 15/2 64891.30 1.19 100

3

/

2

65888.46 1.206 45 9 ( 2 F?/2)( 1 D§)

5

/2 66395.72 1.235 39 20 ( 2F7/2 )(

1 D2 ) V2 66462.86 1.11 68 12 ( 2FI/2)(3 F3)

U/2 68148.88 1.20 59 25 ( 2 F7/2)(3 D§)

7 /2 68450.11 1.08 48 24 ( 2 F?/2)(3P!)

9

/

2

68549.23 1.157 56 13 ( 2FI/2)(3 F2)

13

/ 2 68720.44 1.157 55 40 ( 2 F7/2)( 1 F§)

4/‘ 3

( 2 F7/2)5d6p( 3 F2) 9

/

2

65199.54 1.08 34 ( 7 /2,2) 26 ( 2F?/2)(1 DS)

4/13

( 2 F?/2)5d6p( x F§) ( 7 /2,3) V2 65566.72 1.43 54 19 ( 2 Fi/2 )(3 F2)

3

/

2

69443.52 1.15 27 18 ( 2F7/2)(3 D§)

18/2 70136.24 1.12 46 27 ( 2 F?/2)(3 F1)

5

/

2

71468.70 1.02 33 19 ( 2 F5/2)(3 F2)

7

/

2

72779.99 1.10 67 11 ( 2 F7/2)(3 F3)

9

/

2

73283.35 1.04 49 24 ( 2F§/2)(‘D§)

11/2 73291.95 1.09 75 9 ( 2 F7/2 )(3 DI)

4/ l3( 2 F7/ 2)5d6p( 1 D2) 7

/

2

65577.11 1.055 38 ( 7 /2,2) 18 ( 2 F?/2)(3 F§)

4/ 13( 2 F7/2 )5d6p( 3 D3) ( 7 /2,3) 13

/2 65875.77 1.205 68 15 ( 2F?/2)(3 F4)

1

1

/ 2 66571.58 1.189 55 19 ( 2 F7/2)(3 P2 ) 3

/

2

67204.97 1.04 29 25 ( 2 F?/2)( 1 F§)

9

/

2

67416.03 1.26 52 21 ( 2 F?/2)(3P?)

V2 67955.23 0.895 68 14 ( 2F7/2 )(

1 F3)

4/ 13

( 2 F§/2 )6s6p( 1 P?) 7

/ 2 67938.68 0.960 30 ( 5/2,l) 24 ( 2 FI/2 )5d6p( 1 Pi)

4/ 13

( 2 F?/2 )5d6p( 3 FS) 5

/2 68135.00 1.087 38 ( 7 /2,4) 24 ( 2F7/2)(3 D3)

4/ 13

( 2 F§/2 )6s6p( 1 P?) 3

/

2

68150.57 0.928 32 ( 5

/2,l) 20 ( 2 F§/2)5d6p( 1 Pi)

4/ 13

( 2 F?/2 )5d6p(3P8) 7

/

2

68756.04 1.32 35 ( 7

/ 2,0) 29 ( 2 F7/2)(3 D§)

4/ 13

( 2 FS/2 )5d6p( 3 FS) ( 5/2,2) 9

/2 68943.65 0.89 53 18 ( 2F?/2 )( 3 FS)

5

/

2

71270.01 0.91 33 18 ( 2 F7/2)(3P2)

? /2 72202.03 0.86 43 29 ( 2 F5/2)( 1 D2)

3

/

2

73116.71 0.863 34 23 ( 2F§/2)(3 FS)

V2 75905.77 1.28 40 20 ( 2 F?/2)( 1 F3)

4/ 13

( 2 FI/2 )6s6p( 1 P?) 5

/2 69079.88 0.89 30 ( 5/2,l) 21 ( 2 F§/2 )5d6p( 1 P!)

4/ 13

( 2 F?/2 )5d6p( 3P8) 7/

2

69395.20 0.94 25 ( 7

/ 2,0) 21 ( 2 F?/2 )(3 P!)

4/ l3

( 2 F?/2 )5rf6p(3P?) 5/2 69607.54 1.210 24 ( 7

/ 2, 1

)

18 ( 2F7/2)(3P2)

4/ 13

( 2 F7/2 )5d6p(3P?) 9/2 69957.49 1.112 34 ( 7/2,l) 18 ( 3 F?/2)(3 DS)

4/ 13

( 2 F8/2 )5d6p(3 F§) ( 5 /2,3) V2 70029.04 0.68 28 19 ( 2 F§/2)( 1 D§)

ll/2 72615.74 0.99 85 4 ( 2 F7/2)( 1 F§)

3

/

2

73657.29 1.04 32 25 ( 2 Fs/2)(3 F4)

5

/2 74270.48 0.92 72 7 ( 2 F5/2)(3 D§)

7

/

2

75640.06 0.81 51 19 ( 2F§/2)(3 F§)

9

/

2

76516.11 1.01 46 27 ( 2F5/2)(3 D2)

4yi3(2F^2 )5d6p( 3P§) ( 7 /2,2) lx

/ 2 70793.96 1.20 41 28 ( 2F?/2)(3 FS)

9

/

2

70858.18 1.28 70 13 ( 2F?/2)(3P?)

3

/ 2 71113.84 0.967 22 21 ( 2Fg/2)(3 Fi)

7

/ 2 71222.36 1.15 52 16 ( 2F7/2)( 1 FI)
385

Yb II, Even Parity—Continued

Configuration Term J

Level (cm -1

) 9 Leading percentages

4/13

( 2 F7/2 )5d6p( 3 P!) 5

/70954.27 1.014 27 ( 7

/ 2, 1

)

20 ( 3 F?/2)(3P£)

4/ 13

( 2 FS/2)5d6p( 1 D§) 3

/2 71763.67 1.11 20 ( 5/2,2) 18 ( 2 Fg/2 )( 3 F4)

4/14

(

1 S)8s 2 S

1 h 73039.61

4/i3(2 Fi/2 )5d6p( 1 D2) */2 73636.83 0.70 24 ( 3

/ 2 , 1 ) 21 ( 2 Fg/2)(3 D2 )

4/i3(2F|/2)5d6p(iD2) 9

/2 73750.90 1.07 39 ( 5/2,2) 31 ( 2Fg/2 )(iF§)

4/13

( 2 Fg/2 )5d6p(3 D!) ( 5

/2,l) 7 /2 73966.81 0.763 63 16 ( 2Fg/2)(iD§)

3

/

75058.11 0.76 53 8 ( 2Fg/2 )( 3 F2 ) 3 /2 77284.02 0.90 41 12 ( 2Fg/2 )( 3 DS)

4/13

( 2 F5/2 )5d6p(3 D2 ) ( 5

/ 2>2) 9

/2 74568.58 1.04 55 25 ( 2 Fg/2 )( 3 FS)

4/13

( 2 Fg/2 )5d6p(3 Fg) 7/2 74973.41 1.07 35 (3/2,3) 26 ( 2 Fg/2)(3 F2 )

4/13( 2 Fg/2 )5d6p( 1 D5) X / 2 74989.49 0.52 35 (3/2,2) 27 ( 2 Fg/2 )(3 Dg)

4/13( 2 Fg/2 )5d6p(3 DS) 3

/2 74991.36 1.05 35 (3/2,2) 19 ( 2 Fg/2 )(iD2 )

4/13( 2 Fg/2 )5d6p( 1 DS) ( 5/ 2 , 2) S

/2 75550.94 0.91 45 18 ( 2 Fg/2 )(3 m)

4/ 13( 2 Fg/2 )5d6p(3FS) ( 5/ 2 ,4) 5

/2 76170.25 1.12 35 24 ( 2 Fg/2 )(3 D2 ) 13/2 76233.60 1.07 98 1 ( 2 F7/2 )(3 F4)

7 /2 77882.04 1.13 71 7 ( 2 Fg/2 )(3Pi)

9/2 79126.83 1.15? 71 15 ( 2 Fg/2)(3 DS)

“/a 74 21 ( 2 Fg/2 )(iFS)

4/13

( 2 Fg/2 )5d6p(3 D5) ( s /2,2) 7

/ 2 76323.49 1.00 56 18 ( 2 Fg/2 )(iD§)

4/ 14

(

x S)7d? 2 D? 3/2 76517.21 0.85

3/2 76676.31 1.10

4/ 13( 2 Fg/2 )5d6p(3 Dg) ( 5 /2,3) 11/2 76649.80 1.08 65 20 ( 2 Fg/2)(iFS)

? /2 77449.32 1.16 55 12 ( 2Fg/2 )( 3Dg)

9

/

77747.40 1.07 41 19 ( 2Fg/2 )(3 P2 ) l/2 77887.30 2.20 69 12 ( 2 Fg/2)(3 F§)

3/2 78814.86 1.22 32 24 ( 2Fg/2)(

3 Pi)

4/ 13

( 2 Fg/2)5d6p(3 D§)? 3/2 76799.07 0.84 23 ( 5/2,3) 23 ( 2Fg/2 )( 3 Dg)

4/ 13

( 2 Fg/2 )5d6p( 3 Df)? 3/2 76839.00 1.11 18 (3/2,1) 18 ( 2 Fg/2 )(3 F4)

4/ 13

( 2 Fg/2 )5d6p(3 F5) 5

/2 77606.58 1.14 30 (3/2,4) 22 ( 2 F?/2)(iPl)

4/13

( 2 F?/2 )5d6p( l P!) ( 7/2,l) 9

/

78070.19 1.10 52 26 ( 2 F?/2 )6s6p(iP!)

7

/

79628.71 1.11 55 26

4/ 13

( 2 Fg/2 )5d6p( 1 F§) 3/2 78464.76 1.18 23 (3/2,2) 18 ( 2 Fg/2 )( 3PS)

4/ 13

( 2 Fg,2 )5d6p(3P8) 5/2 79583.11 0.68 27 (3/2,0) 20 ( 2Fg/2 )( 3 P!)

4/ 13

( 2 Fg/2 )5d6p(3P!) 3/2 79605.95 1.16 29 (3/2,1) 24 ( 2Fg/2 )( 3D8)

4/i3

( 2 Fg/2 )5d6p(3Pi) 7/2 80457.71 0.99 33 (3/2,1) 19 ( 2 Fg/2)(3 Dg)

4/ 14

(

1 S)5p 2G 7

/ 2, 9/ 2 80607.45

4/ 13

( 2 Fg/2 )5d6p( 1 Fg) ( 5 /2,3) H/2 80679.18 1.00? 55 30 ( 2 Fg/2)(3 D§)

1/2 82091.32 65 11 ( 2F7/2)(3 F4)

3/2 82398.98 1.042 60 9 ( 2Fg/2)(3 D2 ) 3/2 82891.80 1.03? 54 10 ( 2Fg/2 )(3PS)

7

/

83363.88 0.97 86 8 ( 2 FI/2)(3 D§)

9

/

85 10 ( 2 Fg/2)(3 D§)

225-298 0 - 78 - 27
386

Yb II, Even Parity—Continued

Configuration Term J

Level (cm -1

) g Leading percentages

4/ 13

( 2 Fg/2 )5d6p( 3Pg) ( 5/ 2 ,2)

1 h 61 12 ( 2Fg/2 )(3 D2 ) 9

/2 81205.27 1.09 54 15 ( 2 Fg/2 )(3 F4)

5/2 81312.65 1.11? 38 28 ( 2 Fg/2 )(

1 Pg)

? /2 81692.92 1.16 55 22 ( 2 Fg/2 )(3P?)

4/ 13

( 2Fg/2 )5d6p(3P?) ( 5 /2,l) 3

/2 81512.62 0.48 46 31 ( 2Fg/2 )(3 P2)

4/ 13

( 2 Fg/2 )5d6p(3P8) 5/2 81657.13 31 ( 5

/ 2,0) 17 ( 2Fg/2 )(3 P2 )

4/14

(

1 S)8d 2 D 3/2 83839.86

5/2 84015.98 1.20

4/ 14

( 1 S)6gr 2G 7

/2,9/ 2 85994.92

4/ 14(

1 S)10s 2 S V2 86768.26

4/ I4( 1 S)9d 2 D 3

/ 2 87804.88

5

/2 87980.96

4/ l3( 2 Fg/2 )5d6p( 1 P?) ( 5 /2,l) 3/2 62 31 ( 2 Fg/2)6s6p( 1 P!)

7 /2 58 30

5

/2 89713.17 63 31

4/ 14

(

1 S)10d 2 D 3

/ 2 90414.35

5

/ 2 90519.48

4/14

( 1 S)lld 2 D 5

/2 92219.53

Yb hi PSo) Limit 98269

Yb II, Odd Parity

Configuration Term J

Level

(cm -1

) 9 Leading percentages

4/ 13( 2 F°)6s2 2 F° 7 /2 2il4.l 8.75 1.145 98 1 ( 2 F?/2 )5d2

(

1 S) ‘[Va]

0

5

/

2

31568.08 0.862 90 7 ( 2 F?/2 )5d6s(3D) 3

[ 7

/ 2

]°

4/ 13( 2 F?/2 )5d6s(3 D) 3

t 3

/ 2

]° 5

/2 26759.02 1.570 95 2 ( 2F?/2)(3 D) 3

[ 5

/2

]° 3

/

2

28757.98 1.440 62 27 ( 2 F?/2 )(>D) ![3

/ 2

]° V2 33653.86 1.320 77 13 ( 2 Fg/2 )( 3 D) 3 [V2 ]°

4/14

(

1 S)6p 2p° V2 27061.82 0.667

3

/ 2 30392123 1.333

4/ 13( 2 F?/2 )5d6s(3 D) 3 [U/2]° 9

/ 2 3022U.33 0.935 96 2 ( 2F?/2 )( 3 D) 3

[ 9

/ 2

]° “/2 30562.79 1.112 92 4 ( 2F?/2 )(

l D) l[“/2]°

13

/ 2 31631.59 1.230 100 " 3

[ 5 /2]° 7

/

2

31979.90 1.331 69 28 ( 2 F?/2)(3 D) 3

[ 7

/ 2

]° 5 /2 32371.10 1.170 66 24 ( 2F?/2 )( 3 D) 3

[ 7

/ 2

]° 3

/

2

32981.59 0.866 85 10 ( 2 F?/2)(3 D) 3

[ 3

/ 2

]°

" 3

[ 7

/ 2

]° 9

/

2

33052129 1.264 71 23 ( 2F?/2 )(3 D) 3

[ 9

/ 2

]° 5

/

2

31389.76 1.007 51 29 ( 2F?/2 )(3D) 3

[ s

/ 2

]°

7 /2 35059.00 1.124 56 26 ( 2F?/2 )( 3 D) 3

[ 9

/ 2

]°

" 3

[ 9

/ 2

]° 7 /2 33191.68 0.991 65 15 ( 2 F?/2)(3 D) 3

[ 7

/ 2

]° 9

/

2

35019.13 1.158 67 27 ( 2 F?/2)(3 D) 3

[ 7

/ 2

]° 11

1

2

35831.68 1.214 77 20 ( 2F?/2)(

1 D)
387

Yb II, Odd Parity—Continued

Configuration Term J

Level (cm' 1

) 9 Leading percentages

4/ l3( 2 F?/2 )5rf6s( 1 D) x [*hV 3

/

34575.37 1.434 53 27 ( 2 Fg/2 )( 3 D) 3 [V2]°

' ' 1

f 11 /2]° ll/2 34784.95 1.119 70 18 ( 2F?/2)(3 D) 3

[ 9

/ 2

]°

' ’ 1 C S/2]° 5

/2 37077.59 1.113 74 17 ( 2 F?/2 )(3 D) T/2]

0

' ' 7

/

37516.59 1.119 80 9 ( 2F?/2)5d2

(

1 D) >[ 7/2]°

' ' 1

[ 9/2]° 9

/

383^2.02 1.093 81 11 ( 2F?/2 )5d2

( 1 D) 1 [ 9/2]°

4/ 13( 2 F§/2 )5d6s(3 D) 3

[

i /2 ]° l U 39378.89 1.850 80 13 ( 2F§/2)(

1 D) i[V*]° " 3

[ 9/2]° 7/ 2 40035.82 0.720 94 4 ( 2F?/2)(3 D) 3

[ 9

/ 2]° 9/2 4091 7.91 0.967 87 8 ( 2F§/2)( 1 D) 1

[ 9

/ 2

]° n/2 42915.13 1.115 98 1 ( 2 F?/2)(3 D) 3

t 9

/ 2

]° " 3

[ 3

/ 2 ] 0 5/2 41678.73 1.193 68 26 ( 2Fg/2)(3 D) 3

t 5

/ 2

]° 3

/ 2 41 688.45 0.784 46 47 ( 2 Fi/2)( 3 D) 3

[ 5

/ 2

]° V2 43007.79 0.15 91 9 ( 2F5/2)0D) l[l/2]° " 3

[ 5 /2]° 3

/ 2 43075.09 0.96 43 34 ( 2 Fg/2 )( 3 D) 3

[ 3

/ 2

]° 5

/ 2 43956.41 0.99 46 33 ( 2 Fg/2)(3 D) 3

t 7

/ 2

]°

7

/ 2 44438.03 1.10 53 40 ( 2 Fg/2)(3 D) 3

[ 7

/ 2

]° " VUT 5

/

44497.51 0.734 63 22 ( 2 Fg/2 )( 3 D) 3

[ 5

/2

]° 7

/

45429.82 1.150 48 41 ( 2 Fg/2 )( 3 D) 3

[ 5

/ 2

]° 9

/46169.78 1.10 77 20 ( 2Fg/2 )(

1 D) ‘[9/2]°

4/ 13

( 2 Fi/2 )5d6s(3 D) 3

/

44940.61 1.244 29 3

[

1 / 2

]° 17 ( 2 F7/2 )5d2

( 3 F) 3

[ 3

/ 2

]°

4/ 13( 2 F?/2 )5rf2

( 3F) 3

t 5/2]° 5/2 45012.79 1.281 48 34 ( 2F?/2)(3 F) 3

[ 3

/ 2

]°

4/13( 2 F?/2 )5d2

( 3 F) 7

/45273.02 1.18 34 3

[ 7

/ 2

]° 34 ( 2 F?/2)(3 F) 3

[ 5

/2

]°

4/13

( 2 Fg/2 )5d6s( 1 D) 9

/

45335.03 1.01 65 20 ( 2Fs/2 )( 3 D) 3

[ 7

/ 2

]°

4/ 13

( 2 F7/2 )5d2

( 3F) 3

/4573729 1.333 34 3

[ 3

/ 2

]° 22 ( 2 F?/2 )( 3 F) 3 [‘/2]°

4/ 13

( 2 F?/2 )5d2

( 3 F) 3[7/2

]° 9

/46354-55 1.29 54 28 ( 2F?/2)(3P) 3

[ 7

/ 2

]° " 3

[ 13/ 2

]° U/2 46547.72 0.97 82 14 ( 2 F?/2 )( 3 F) 3

[ 11 /2]° 13/2 47680.40 1.12 85 15 ( 2 F?/2)(3 F) 3

[ 11 /2]°

is/2 48923.30 1.20 96 4 ( 2F?/2)0G) H

15/2]°

4/13

( 2 F?/2 )5d2

( 3 F) 3[ 3

/ 2

]° X /2 46902.71 1.30 48 24 ( 2F?/2)(3 F) 3 [V2]° 4/13

( 2 Fg/2 )5d6s( 1 D) 1 [ 3 /2]° 3

/47005.46 0.990 77 8 ( 2Fg/2 )( 3 D) T/2 ]°

' ' VhT V2 47228.96 0.74 50 14 ( 2 F?/2)(3 D) 3

t 3

/ 2

]°

' ’ '[ 5/2

]° 5

/2 47329.44 0.990 58 12 ( 2 F7/2 )5d2

( 3 F) 3

[ 3

/ 2

]°

4/13

( 2 F?/2 )5d2

( 3 F) 3

[ 11

/ 2

]° 9

/47663.52 0.98 62 19 ( 2 F?/2)(3 F) 3

t 9

/ 2

]° 11/2 48503.82 1.10 54 28 ( 2 F?/2)(3 F) 3

[ 9

/ 2

]° 13 /2 49727.19 1.20 84 15 ( 2F?/2)(3 F) 3

t 13

/2

]°

4/ 13

( 2 F7/2 )5d2

( 3 F) 7

/

47758.54 1.08 41 3

[ 9

/ 2

]° 38 ( 2 F?/2 )(3 F) 3

[ 5

/2

]°

4/ 13

( 2 F?/2 )5d2

( 3 F) 3

t

1 /2]° 3

/

48024.70 1.38 53 30 ( 2 F?/2)(3 F) 3

[ 5

/ 2

]° V2 49419.13 1.41 67 22 ( 2 F?/2)(3 D) 3

[ 3

/ 2

]°

4/ 13

( 2 F?/2 )5d2

( 3 F) 5/2 48272.77 1.14 36 3

t 3

/ 2

]° 22 ( 2 Fg/2)5d6s( x D) 1 [ 5

/ 2

]°

4/ 13

( 2 Fg,2 )5d6s( 1 D) 7 /2 48556.57 0.941 81 11 ( 2 F§/2 )5d2

(

1 D) 1 [ 7/2]°
388

Yb H, Odd Parity—Continued

Configuration Term J

Level (cm 1 ) 9 Leading percentages

4/ 13

( 2 F?/2 )5d2

( 3 F) 3

[ 9

/ 2

]° 7 /2 49008.93 1.03 43 15 ( 2 F?/2 )(3 F) 3

[ 5

/ 2

]° 9

/

2

49916.50 1.090 52 31 ( 2F?/2)(3 F) Wa]0 U/2 50468.05 1.213 49 28 ( 2 F?/2)(3 F) 3

[

1

1

/ 2

]°

4/13( 2 F$/2 )5d2

( 3 F) 3/2 50832.65 0.956 35 3

[ 5

/ 2

]° 30 ( 2 F?/2)(3 F) 3

[ 3

/ 2

]°

4/13

( 2 F?/2 )5d2

( 3 F) 5/2 51248.86 1.034 40 3[ 7

/ 2

]° 25 ( 2 F?/2 )( 3 F) 3

[ s

/ 2

]°

4/ 13

( 2 F?/2 )5d2

( 1 G) YhY V2 52067.87 0.54 67 20 ( 2 F?/2)(3 F) 3

[ 3

/ 2

]°

4/13

( 2F?/2 )5d2

(3P) 3

[ 7

/ 2

]° 9

/

2

52880.75 1.26 45 35 ( 2F?/2)(3 F) 3

[ 7

/ 2

]°

7

/

2

52921.62 1.15 51 36

5

/

2

53120.58 0.944 67 10

4/ 13

( 2 F?/2 )5d2

(

1 G) YhY 3

/

2

52987.76 1.131 61 12 ( 2 F§/2)(3 F) 3

[ 3

/ 2

]° " Y5hY 15/2 53322.89 1.04 96 4 ( 2 F?/2 )(3 F) 3

[ 13

/ 2

]°

' 4/ 13

( 2 F?/2 )5d2

(

1 D) VhY 7

/

2

53644-89 1.18 45 13 ( 2 F§/2 )(3 F) 3

[ 5

/ 2

]°

4/13

( 2 Fg/2 )5d2

( 3 F) S/2 53716.38 1.183 32 3

[ 5/2]° 19 ( aF$/2)(*D) 1

t 5

/2

]°

4/ 13

( 2 F?/2 )5d2

(

1 D) 1

[ 11 /a]° 11/2 54192.51 1.11 70 8 ( 2 F?/2 )(3 F) 3

[ 9

/ 2

]°

4/ 13

( 2 F?/2 )5d2

(

1 D) ThT 9

/

2

54640.82 1.13 60 10 ( 2 F?/2 )(3P) 3

[ 7/ 2

]°

" Vl2]° 3/2 55221.46 1.11 56 22 ( 2 FS/2 )(3P) 3

[ 5

/ 2

]°

4/ l3( 2F?/2 )5d2

( 3P) T/2]

0 7

/

2

55462.68 0.878 62 22 ( 2 Fg/2 )(3 F) 3

[ 9

/ 2

]° 9

/

2

56088.39 1.11 63 10 ( 2F?/2 )(

l G) YIY

X1 /2 56621.15 1.16 64 14 (2F?/2)(

1 G) l t lx

/2]

0

4/13

( 2 F?/2 )5d2

( 3 P) 5

/2 56056.91 1.12 32 3

[ 5/2]° 32 ( 2F7/2)(3 F) 3

[ 5

/ 2

]°

4/ 13( 2Fg/2 )5d2

( 3 F) 3

[ U/2]° 9

/

2

56480.77 0.76 94 3 ( 2 F?/2)(3P) 3

[ 9

/2

]° U/2 58051.51 0.95 99

13

/2 596327211 93 7 (2F§/2)(

X G) l [ 13

l2]°

4/ 13

( 2 F?/2 )5d2( 3P) 3

[ 5 /2]° 7

/

2

56500.64 1.352 77 8 ( 2F?/2 )(3 P) 3

[ 7

/ 2

]° 5

/2 57798.51 1.151 50 22 ( 2F?/2)( 1 D) YhY

3

/

2

58162.75 0.94 60 18 ( 2 F?/2)( 1 D) YhY

4/13( 2 F§/2)5d2

( 3 F) 3/

2

56840.04 0.90 40 3

t 5 /2]° 19 ( 2 F§/2 )(3 F) 3

[ 3

/ 2

]°

4/ 13( 2F§/2 )5o?2

( 3F) 3[V2

]° V2 56977.71 2.19 90 8 ( 2Fi/2)(3 F) 3

[ 3

/ 2 ]° 3

/

2

59777.07 1.63 71 21

4/ 13

( 2F?/2)5d2

(

1 G) VhY 7

/

2

57103.02 1.10 82 11 ( 2F?/2)( 1 D) VhY

4/ 13

( 2 Fg/2 )5d2( 3 F) 3

t 9

/ 2

]° 7

/

2

57534.45 0.87 54 16 ( 2F§/2)(3F) 3

[ 7

/ 2

]° 9

/

2

59046.89 1.08 57 24 ( 2F§/2)(3F) 3

[ 7

/ 2

]° Xi/2 61442.82 1.11 91 4 ( 2F?/2 )(

1 G) Y'hY

4/ 13( 2F7/2 )5d2

(

1 G) 1

[ 13/2

]° 13

/2 57561.62 1.04 94 5 PFI^OG) vwr

4/ 13

( 2 F7/2 )5c?2

(

1 G) 1

[ 9/2]° 9

/

2

58484.54 1.02 75 11 ( 2F§/2)( 3F) T/2]

0

4/ 13( 2 Fg/2 )5c/2

( 3F) 3

[ 7/2]

C 5

/

2

58661.13 0.86 59 14 ( 2Fi/2 )( 3 F) 3

[ 5

/2

]° 7

/

2

59624.66 60 19 ( 2Fs/2 )(3 F) 3

[ 9

/ 2

]° 9

/

2

60649.86 1.10 57 20 ( 2F!/2)(3F) 3

[ 9

/ 2

]°

" 3

[ 3/ 2

]° V2 58672.53 0.538 69 15 ^F^G) 1

[

1 /2]°

4/ 13

( 2 FI/2 )5d2

( 3F) 5

/2 59439.08 0.994 33 3

[ 3

/2

]° 29 ( 2Fg/2 )( 3 F) 3

[ 5

/ 2

]°

4/ 13

( 2 F7/2 )5d2

(

1 G) 1

[ 11 /2]° U/2 59753.84 1.11 73 14 ^F^GD) V'hY
389

Yb II, Odd Parity—Continued

Configuration Term J

Level (cm' 1 ) 9 Leading percentages

4/ 13

( 2Fg/2 )5</2

( 3F) 3

/ 2 60910.

1.00 36 3

[ 3

/ 2

]° 20 ( 2Fs/2)(3 F) 3

[!/2

]°

4/ 13

( 2Fs/2)5(/2( 3 F) 3

[ 5

/ 2

]° 7

/ 2 62046.07 1.14 67 11 ( 2Fi/2)(

i D) h

7

/ 2

]°

4/ 13( 2Fg/2 )5tf2

( 3F) 5

/ 2 62163.92 33 3

[ 3

/ 2

]° 32 ( 2Fg/2)(3F) 3

[ s/ 2 ]°

4/ 13

( 2 F§/2 )5o? 2

( 3P) 3

[ 5

/ 2

]° 3

/ 2 6302826 0.51 66 22 ( 2Fs/2)(3F) 3

t 5

/ 2

]° 5

/ 2 631,17.03 1.01 75 4 ( 2 F§/2)( 1 G) l[ 5

/2

]° 7

/ 2 64169.39 51 17 ( 2F§/2)(

1 D) x

[ 7

/ 2

]°

4/ 14

(

1 S)7p 2p° - x h 6370625 0.661

3

/ 2 65594.10

4/ 13

( 2Fs/2)5(/2

(

1 G) 1

[ 3

/ 2

]° 3

/ 2 64191.97 1.193 80 5 ( 2 F5/2)(3 F) 3

[ 3

/ 2

]°

4/ 13

( 2 F§/2 )5rf2(

1 D) VhT 9

/ 2 64365.00 68 10 ( 2Fg/2)( 1 G) H

9^]

0

4/13

( 2Fs/2)5rf2

(

1 D) 7

/ 2 64970.74 40 1

[ 7

/ 2

]° 28 ( 2 Fs/2)(3P) 3

[ s

/2]°

4/ 13( 2 Fs/2 )5(/2

(

1 D) vi*r */2 65149.31 64 30 ( 2 Fs/2)( 3P) 3

[ 3

/ 2

]°

4/ 13

( 2Fs/2)5(/2

(

1 G) 1

[ 5

/ 2

]° 5

/2 65739.47 0.879 31 23 ( 2Fi/2 )( 3P) 3

f 7

/2 ]°

4/13

(2FI/2)5d2

(

1 D) 1 [ 3

/ 2

]° 3h 66189.00 0.91 67 22 ( 2 FI/2)(3P) 3

[ 3

/ 2

]°

4/ 13

( 2 Fg/2 )5(/2

(

1 G) 5

/ 2 66205.87 32 TO0 19 ( 2FI/2)('D) ![ 5

/ 2

]°

4/ 13( 2F§/2)5c?2

( 3P) 3

[ 7

/ 2

]° 7

/ 2 66796.03 81 10 ( 2Fs/2)(3 F) 3

[ 7

/ 2

]°

4/ 13

( 2Fg/2)5(f2

( 3P) 3

[ 3

/ 2

]° 3

/ 2 67789.60? 73 20 ( 2Fi/ 2)( 5

1 D) VhT

h 67933.51 1.17 72 22 ( 2F§/2)(

1 G)

1

[ 5

/ 2

]°

l h 70 28 ( 2 Fs/2)( 1 D) 1

[ 1

/2

]°

4/ 14

(

J S)5/ 2 p

° s

/2 70502.90

7

/2 70580.19

4/ 14

(

1 S)6/ 2 p

° 5

/ 2 80458.95

7

/ 2 80471.80

9

/2 84217.85 1.19

7

/ 2 84444-07

5

/ 2 84632.71 4/ 14

(

1 S)7/ 2 p° 5

/ 2 85898.13

7

/ 2 8590620

5

/ 2 86148.67 1.575

3

/ 2 86226.31 1.35

7

/ 2 87385.74 1.14

J1

/ 2 88702.97 1.08?

7

/ 2 88721.12 1.17

4/ 14

(

1 S)8/ 2 F° s

/ 2 891 75.85

7

/ 2 89185.44

9

/ 2 89605.80 0.94?

5

/ 2 89615.59

3

/ 2 89897.55 1.01

7

/ 2 90142.74

9

/ 2 90209.67
390

Yb II, Odd Parity—Continued Yb ll. Odd Parity—Continued

Configuration Term J

Level (cm -1

) 9

Configuration Term J

Level (cm -1

) 9

“/2 90279.08 1.12 3/2 93998.52

9

/

2

9071 7.54 7

/

2

94008.96

5/2 90859.07 7

/

2

94303.58 1.12

7

/

2

91237.94 ll

/ 2 94335.70

13/2 91301.57 1.22 9/2 94360.00

4/14

(

1 S)9/ 2 F

° 7

/

2

91311.40

3

/2 94428.80

5/2 91314-85 4/ 14

(

x S)12/ 2 F

° 7

/

2

94579.04

7

/

2

91536.40 1.13?

3

/

2

94823.18

5

/

2

91602.54 1.17 4/14

(

1 S)13/ 2 F

° 7 /2 95163.35

9

/2

9

/

2

95550.55 92015.76

1.49? 4/ 14

(

1 S)14/ 2 F

° 95619.7

3

/2

7

/

2

92278727

95691.32

7

/

2

7 /2 92303724 n/ 2

X1

/ 2 95754-30 0.89? 92647.34 U/2 96382.06 1.23

4/' 14

(

1 S)10/ 2 F° S

/2 92764-62 9

/ 2 96482.44

7 /2 92766.91 "/2 96898.03

9

/ 2 92914.15 13/ 2 9704328

7

/

2

92919.10 9

/

2

97086.51

? /2 92976.50 n/ 2

7

/ 2

93096.30 1.23 Yb in (>So) Limit 98269 93195.03

ll

/2 93242.39

9

/ 2 98521.73

13/2 93246.19 1.21?

l 3

/2 98620.02

7

/ 2 93463.01 U/ 2 98802.66

9

/

2

93503.89

13 /2 98829.49

5 /2 93546.00

X1

/ 2 99246.37

4/i4

(

i s)n/ 2 F

° 7

/ 2 93808.12

9

/ 2 99414.42

5/2 93864.57 11/2 100025.57

9

/

2

93867722
391

Yb III

(Er i sequence; 68 electrons) Z- 70

Ground state (ls 2 2s 2 2pfi 3s 2 3p6 3d 10 4s 2 4pfi 4d 10 5s 2 5pfi ) 4/ 14 'S„

Ionization energy 202070± 200 cm 1 25.05± 0.03 eV

Identified even configurations 4/ 14

, 4/ 13 6p

Identified odd configurations 4/ 13 5d, 4/ 13 6s, 4/ 13 7s, 4/ 13 6d

All but one of the levels are from Bryant’s analysis of this spectrum [1961, 1965]. Except

for 4/ 13 6d, each of the configurations listed above is complete. The position for the

4/ 13( 2 F°)/2 )5d (%,5

/2 )o level was suggested by Sugar [1970].

The basic theoretical interpretation is also due to Bryant, who noted the strong tendency

toward J x j coupling. The leading eigenvector percentages in LS coupling are also listed. All percentages are from Bryant’s calculations except for 4/ 13 5d, which has more recently been

calculated with the inclusion of appropriate effective interactions. The leading percentages for

4/ 13 5d in J x j coupling are from Goldschmidt and Salomon [1972], and the percentages in LS

coupling are from a similar calculation by Sugar [1973], A complete set of energy-parameter

values derived by fitting (4/

13 5d+4/ 13 6s) has been published by Wyart, Blaise, and Camus

[1974],

Bryant gave positions for 10 of the 20 levels expected for 4/ 13 6d, which he located by

classifying a number of 4/ 13 6p—4/

13 6d transitions in the vicinity of 2100 A. His Jx j

designations for the 4/ 13 6d levels are tentative.

Bryant’s full line list [1961] gives an experimental separation of the Yb spectra from the

different ions, and has lines assigned to Yb ill extending from 968 A to 10830 A. Meggers and

Corliss [1966] attributed 430 lines to Yb ill in the region above 2000 A, also based on an experimental separation. The assignments of lines occurring in both lists do not always agree. Bryant’s analysis gives classifications for almost 200 Yb ill lines, including practically all of the

strong lines (1798-5432 A).

The ionization potential is from Kaufman and Sugar.

References

Bryant, B. W., Johns Hopkins Spectr. Report No. 21, 82 pp. (1961). EL CL W IP PT

Bryant, B. W., J. Opt. Soc. Am. 55, 771 (1965). EL CL W IP PT

Goldschmidt, Z. B., Thesis, Hebrew Univ. Jerusalem, Israel, 487 pp. (1968). PT

Goldschmidt, Z. B., and Salomon, D., unpublished calculations (1972); see Goldschmidt, Z. B., in Atomic Physics 3, S. J. Smith and G. K. Walters, Eds., pp. 221-246 (Plenum Press, New York, 1973). ND PT

Kaufman, V., and Sugar, J., J. Opt. Soc. Am. 66, 1019 (1976). IP Meggers, W. F., and Corliss, C. H., J. Res. Nat. Bur. Stand. (U.S.) 70A, 63 (1966). W

Sugar, J., J. Opt. Soc. Am. 60, 571 (1970). EL CL PT

Sugar, J., unpublished calculations (1973). PT

Wyart, J. F., Blaise, J., and Camus, P., Phys. Scr. 9, 325 (1974). PT

[October 1976]
392

Yb ill

Configuration Term J

Level (cm 1 ) Leading percentages

4/14 ‘S 0 0.00

4/ l3( 2 F7/2 )5d3/2 ( 7

/ 2 , 3

/ 2)

0 2 33385.80 79 or 91 3P°

5 37020525 96 or 54 3 H°

3 39151-18 94 or 56 3 D°

4 50160.03 93 or 47 3 F°

4/ 13( 2 F7/2 )6si/ 2 ( 7

/ 2 , 1/ 2

)° 4 35656.13 100 or 100 3 F°

3 35990.66 100 or 54 >F°

4/ 13( 2 F7/2 )5ds/2 ( 7

/2,5

/ 2

)° 6 39085.39 100 or 100 3 H°

1 39720.79 67 or 81 3p°

2 50288.07 81 or 57 >D°

4 52525.08 92 or 46 3 F°

3 53019.16 93 or 40 iF°

5 53622.75 95 or 83 3G°

4/ l3( 2 F|/2 )6si/ 2 ( 5/ 2 , 1 / 2

)° 2 55853.59 100 or 100 3F°

3 55207.65 100 or 54

4/ 13( 2 F5/2 )5d5/ 2 ( 5/ 2 , 5/ 2 )° 0 55276.85? 100 or 100 3P°

1 50029.52 84 or 83 3 D°

5 50357.56 98 or 43 3 H°

2 51563.38 95 or 48 3 F°

3 53122.79 96 or 39 3 F°

4 53735.86 96 or 57 3G°

4/ 13( 2 F5/2 )5d3/2 ( 5/ 2 , 3/ 2

)° 4 57056.92 93 or 80 3 H°

2 58515-67 95 or 40 3 F°

3 51581.78 97 or 52 3G°

1 53365.19 72 or 89 i P

°

4/i3(2 F7/2 )6pi/2 ( 7

/2,

1 / 2 ) 3 72140.35 98 or 69 3 D

4 72486.97 99 or 46 3G

4/13(2 F7/2 )6p3/2 ( 7

/2,3/ 2 ) 5 78020.45 100 or 100 3G

2 78183.44 99 or 49 'D

3 78779.29 97 or 44 iF

4 79282.90 99 or 77 3 F

4/i3( 2 FI/2 )6p 1 / 2 ( 5 /2//2 ) 3 82546.33 98 or 77 3G

2 82907.42 98 or 44 *D

4/13( 2 F5/2 )6p3/2 ( 5

/2,3

/2) 1 87612.61 100 or 100 3 D

4 88497.90 100 or 52 3G

2 88977.09 98 or 65 3F

3 89397.41 99 or 53 3F

4/13

( 2 F7/2 )7si/2 ci^hr 4 120257.02 100 or 100 3F°

3 120365-81 100 or 56 iF°

4/ 13( 2 F7/2 )6d3/2 ? ( 7

/2,3 /2)°? 4 125810.05

4/i3(2 F7/2 )6d5/2 ? ( 7

/2,5 /2)°? 6

2 125986.98

4 126556.07

3 126559.11 5

4y'i3( 2 Fg/2 )7si/2 ( 5 /2,V2

)° 2 130557.55 100 or 100 3F°

3 130551.08 100 or 56

4/i3(2 F5/2 )6d3/2 ? ( 5

/2,3 /2)°? 4,3 132865-02

4yi3(2Fg/2 )6d3/2 ? ( 5

/2,3

/2 )°? 1,2 133997.33

4/ 13

( 2 F5/2 )6rf3/2? ( 5

/ 2, 3 /2)°? 3,2 135355.31
Yb III

Continued

Configuration Term J

Level (cm -1

) Leading percentages

4/l3(2 Fg,2 )6d5,2? ( 5

/2, 5 /2)°? 2 136350.98

4/ I3

( 2Fg/2)6ds/2? ( 5

/2,5 /2)°? 3 136699.69

4/ 13( 2 F5/2)6d5/2? ( 5

/2,5 /2)°? 4,3 1368A9.U

Yb iv ( 2 F?/2 ) Limit 202070
394

Yb IV

(Ho i sequence; 67 electrons) Z=70

Ground state (ls 2 2s 2 2p6 3s 2 3p6 3d 10 4s 2 4p6 4d 10 5s 2 5p6

) 4/ 13 2 F°/2

Ionization energy 351300± 800 cm 1 43.56± 0.10 eV

Identified odd configurations 4/ 13

, 4/ 12 6p

Identified even configurations 4/ 12 5d, 4/ 12 6s

Bryant [1961] observed the spectra of arc and spark discharges between Yb electrodes

and gave an experimental separation of the lines from the different ions (see Yb hi). His line

list includes assignments to Yb IV from 677 to above 3700 A, but the wavelengths below 2000

A are probably not sufficiently accurate for analysis. An array of transitions to the 4/ 13 2 F°

levels was set up, but the derived 2 F° interval was later found to be erroneous. Kaufman and Sugar [1976] observed the spectrum of a sliding-spark source over the

region 800-1500 A and assigned about 200 lines to Yb iv. Their paper gives the wavelengths

for 38 of these lines, which were classified as transitions from 19 upper 4/ 12 5d levels to the

4/ 13 2 F° ground doublet. The observations have recently been extended up to 2190 A, and

about 320 of the more than 600 lines now assigned to Yb iv are classified [Sugar, Kaufman,

and Spector, 1977]. The levels here are from this new analysis, which includes transitions from

the 4/ 12 5d-4/ 12 6p and 4/ 12 6s-4/ 12 6p arrays. The 2 F 5 /2 - 2 F°/2 ground-term interval is accurate

to about ±0.1 cm -1

, and most of the higher levels are accurate to within ±0.5 cm'1

. The leading percentages for the levels of the excited configurations are from calculations

by Sugar et al. [1977], We have listed the percentages in the same coupling schemes as for the

isoelectronc spectrum Tm hi, with the first percentages being given in J x j schemes based on

levels of the 4/ 12 core. Leading percentages in LS coupling are listed in the last column

(following the word “or”) for the 4/ 12 6p levels and for all except three of the even levels. The

calculation for (4/

12 5d+4/ 12 6s) included the interaction of these configurations; for three levels with eigenvectors having >20% configuration mixing, we give as the second percentage the

total percentage contribution of the second configuration.

Sugar et al. [1977] obtained the quoted ionization energy by the method outlined by Sugar

and Reader [1973]; the new value is more accurate because of the elimination of the

uncertainty in the position of the 4/ 12 5d configuration.

References

Bryant, B. W., Johns Hopkins Spectr. Rep. No. 21, 82 pp. (1961). W

Bryant, B. W., J. Opt. Soc. Am. 55, 771 (1965). Kaufman, V., and Sugar, J., J. Opt. Soc. Am. 66, 439 (1976). EL CL

Sugar, J., Kaufman, V., and Spector, N., unpublished material (1977). EL ND CL W IP PT

Sugar, J., and Reader, J., J. Chem. Phys. 59, 2083 (1973). IP

[May 1977]
395

Yb iv

Configuration Term J

Level (cm ’) Leading percentages

4f

13 2 jr° 7

/ 2 0.0

5

/ 2 10214.0

4/ 12( 3H6)5(/3/2 (6

3

/ 2 ) 9/ 2 78529.2 85 or 78 ( 3 H) 4 F

15/2 82185.6 97 or 53 ( 3 H) 2K

n/2 82673.1 80 or 77 ( 3 H) 4G

13

/

85545.6 93 or 34 ( 3 H) 4

I

4/ 12

( 3 H6 )5rf5/2 (6,5

/ 2 ) 7/ 2 84347.1 42 or 46 ( 3 H) 4 F

17/2 85124.9 99 or 99 ( 3 H) 4 K

9

/ 2 88118.1 52 or 31 ( 3H) 4G

h/2 88175.3 51 or 28 ( 3H) 2 H

15

/

88877.3 97 or 83 ( 3 H) 4

I 13

/2 89422.5 63 or 38 ( 3H) 4 H

4/ 12

(3F4)5d3/2 (4,

3

/2 ) 5

/ 2 88321.9 45 or 22 ( 3F) 4D

4/ 12( 3 F4 )5t/3/2 7

/2 89520.6 37 (4, 3

/ 2) or 21 ( 3F) 4D

4/ 12( 3 F4 )5(/3/2 9

/ 2 90045.7 44 (4, 3

/ 2) or 23 ( 3H) 4G

4/ 12( 3 H6 )5rfs/2 u/2 90834.2 23 (6,

5

/ 2) or 20 ( 3H) 2 H

4/ 12( 3 Hs)5rf5/2 (5,

5

/ 2 ) 5/2 91482.3 40 or 59 ( 3 H) 4F

15/2 99 or 59 ( 3 H) 4K

?

/ 2 95977.0 47 or 30 ( 3H) 4G

9

/2 97592.9 64 or 24 ( 3H) 4G

ll/2 99180.4 76 or 43 ( 3 H) 4 H

15/2 91 or 58 ( 3H) 4

I

4/ 12( 3 Hs)5(/3/2 (5

,

3

/ 2 ) ?

/ 2 91532.5 47 or 55 ( 3 H) 2F

13/2 91931.8 81 or 49 ( 3 H) 4 K

n/2 95078.1 81 or 42 ( 3 H) 4

I 9

/ 2 95215.7 61 or 45 ( 3H) 2G

4/' 12

( 3 F4 )5rfs/2 (4,

5

/2 ) 11

/ 2 93080.9 55 or 47 ( 3F) 4G

4/' 12

( 3 F4 )5f/s/2 (4,

5

/ 2) 9

/2 94387.1 54 or 33 ( 3F) 4F

4/ 12( 3F4 )5rf3/2 S

/2 94498.5 27 (4, 3

/ 2) or 27 ( 3F) 4 P

4/ 12

( 3F4 )5t/s/2 7

/2 94834.2 24 (4, 5

/2) or 21 ( 3F) 4 D

4/‘ 12

( 3 F4 )5(/s/2 15/2 95317.0 31 (4,

5

/ 2) or 31 ( 3F) 4 H

4/ 12

( 3 H4 )5f/3/2 (4,

3

/ 2) H/2 97587.8 49 or 40 ( 3 H) 4K

4/ 12( 3H5 )5(/s/2 S

/2 98222.8 30 (5,

5

/ 2) or 26 ( 3H) 2F

4yi2(3F3 )5rf3/2 (3,

3

/2) 7

/

98502.5 52 or 37 ( 3 F) 4G

4/ 12

( 3 H4 )5c?3/2 9

/

98971.6 44 (4, 3

/ 2) or 25 ( 3H) 4

I

4/12(3

F2)5fi?3/ 2

S

/2 99344.8 43 (2, 3

/ 2) or 43 ( 3F) 4G

4/ 12( 3 F2)5f?3/2 7

/2 100350.4 31 (2, 3

/ 2) or 25 ( 3F) 4 H

4/ 12

( 3 H4 )5t/s/2 5

/2 101318.4 18 (4,

5

/ 2) or 26 ( 3H) 4G

4/ 12

( 3 F3 )5(f3/2 (3, 3

/2) 9

/2 101966.6 53 or 36 ( 3F) 4 H

4/12(3F3)5t/3/2 S

/2 102158.1 34 (3, 3

/2) or 23 ( 3F) 4P

4/ 12( 3 F2 )5(/5/2 7

/

102542.5 21 (2, 5

/2 ) or 35 ( 3 F) 4 F

4/ 12

( 3 H4 )5(/s/2 9

/

102790.1 23 (4,

5

/ 2 ) or 27 ( 3 F) 4 F

4/ 12( 3H4 )5fl?5/2 ll/2 102850.6 40 (4,

5/2) or 29 ( 3 H) 2

I 4/ 12

( 3F3 )5(/5/2 (3,

s

/ 2 ) 5

/2 103484.2 63 or 31 ( 3F) 4D

4/12

(3F3)5ds/2 7

/

104226.0 39 (3, 5

/ 2) or 59 ( 3 F) 2G

4/ 12( 3 F3 )5rf5/2 (3,

5

/2) 9

/2 104613.3 59 or 38 ( 3F) 2 H

4/ 12( 3F2 )5(/5/2 7

/

105685.0 29 (2,

5

/ 2 ) or 32 ( 3 F) 2 F
Yb IV—Continued

Configuration Term J

Level (cm ') Leading percentages

4/' 12

( 3 H6 )6sj/2 (6,V2) 13

/ 2 105978.8 99 or 99 ( 3 H) 4H

11

/ 2 106801.7 77 22 4/ 12 5c?

4/

i2( 3 Fa)5t/5/2 7

/

2

106040.0 23 (3, 5

/ 2) or 20 ( 3 H) 2G

4/12(3F3)5rf5/2 (3,

5

/ 2) n/2 106557.7 58 or 52 ( 3 F) 4 H

Af i2(3F2)5c?5/2 (2,

5

/ 2) 9

/2 107566.2 46 or 28 ( 3 F) 2 H

4/i2

( 3 F2)5rf5/ 2

5

/ 2 107873.4 40 (2,

5

/ 2) or 46 ( 3 F) 2 D

4/ 12( 3 H4)5d3/ 2 9

/2 109025.2 41 (4,

3

/ 2 ) or 38 OG) 2 H

4/ 12( 1 G4 )5d3/ 2

? /2 110808.7 35 (4,3

/ 2) or 31 PG) 2 F

4/ 12( 1 G4 )5ds/2

7

/

2

111550.7 34 (4,

5

/ 2) or 28 ( 3H) 4 H

4/i2( 3F4 )6si/2 (4,V2) 9

/ 2 112189.4 64 or 64 ( 3F) 4 F

7

/ 2 112772.6 55 or 39 ( 3F) 2F

4/ 12

( 1 D2 )5c?3/2

5

/ 2 112679.1 21 (2, 3

/ 2 ) or 22 (

X G) 2 F

4/ 12

( 1 G4 )5c?5/2

9

/

2

112812.4 42 (4,

5

/ 2) or 31 (

4 G) 2G

4/ 12( 3H5 )6si/2 (5,V2) U/2 115910.8 98 or 66 ( 3H) 4H

9

/2 115974.6 98 or 66

4/i 2

( 3 F2)5d3/ 2

5

/

2

117026.4 18 (2,

3

/ 2) or 29 ( 3F) 2 F

4/ 12

( 1 D2)5d5/2

5/2 120328.9 32 (2,5

/ 2) or 22 (

X D) 2 F

4/' 12

(

1 I 6 )5P3/ 2 (6, 3

/ 2 ) 9

/

2

120633.5 53 32 4/ 12 6s

4/ 12( 3 H4 )6si/ 2 (4,V2)

7/2 120667.2 54 or 54 ( 3H) 4H

4/' 12

( 3 P2 )5f/5/2 9

/

2

120773.8 34 (2,5

/ 2) or 33 ( 3P) 4 F

4/ 12( 3 H4 )6si/2

9

/

2

121008.2 27 (4,

1

/ 2) 49 4/ 12 5rf

4/ 12( 3F3 )6s 1/2 (3,V2)

5

/

2

122476.4 70 or 88 ( 3F) 4 F

7/2 122650.4 95 or 63

4/ 12(3F2 )6s 1/2 (2,V2) 3

/

2

122787.4 74 or 74 ( 3F) 4 F

5/2 123710.5 47 or 73 ( 3F) 2 F

4/ 12

( 3Po)5rfs/2

5/2 124939.3 24 (0,

5

/ 2 ) or 42 ( 3P) 4D

4/i2

( 3p1 )5t/3/2 (l,3

/2)

5/2 126399.3 78 or 64 ( 3P) 4 F

4/' 12

(

1 D2 )5r/5/2

?

/

2

126867.0 29 (2,

5

/ 2 ) or 39 ( 3P) 4D

4/ 12

( 3Pl)5f?5/2

7

/ 2 128900.2 39 (l, 5

/2) or 61 ( 3P) 4F

4/' 12

(

1 G4 )6si/2 (4,

1

/ 2) 72 130524.0 49 or 49 (

J G) 2G

9

/2 130676.9 51 or 51

4/'i2(3H6 )6pi/2 (6,72)° n/2 152589.1 97 or 71 ( 3H) 4G°

13

/ 2 1532084 99 or 46 ( 3 H) 2 I"

4/ 12( 3F4 )6pi/2 (4,72)° 72 158935.7 62 or 32 ( 3F) 4 D°

9

/ 2 158939.6 57 or 23 ( 3F) 2G°

4/ 12

( 3H6)6p3/ 2 (6, 3

/2

)° 15

/2 1611104 99 or 99 ( 3H) 4

I°

9

/ 2 60 or 58 ( 3H) 4G°

11

1

2

162061.8 55 or 32 ( 3H) 4 I°

13

/ 2 162635.1 99 or 73 ( 3H) 4 H°

4/ 12( 3 Hs)6pi/2 (5,72

)° 11

/ 2 162991.9 58 or 58 ( 3H) 2H°

72 163002.5 69 or 76 ( 3 H) 2G°

4/ l2

( 3H4 )6pi/2 (4,72)° 9

/2 167196.3 38 or 38 ( 3H) 4I°

1 ?

/2 1674134 48 or 24 ( 3H) 4G°
Yb IV

Continued

Configuration Term J

Level

(cirr 1 ) Leading percentages

4/ 12

(3F4)6p3/2 (4,

3

/ 2

)° 5h 167591.0 40 or 28 FG) 2F°

n/2 1680214 59 or 59 ( 3 F) 4G°

9

/2 168092.9 44 or 34 ( 3F) 2G°

7/2 168124.6 46 or 33 ( 3F) 4 D°

4yi2(3F3 )6p 1/2 (3,V2)° 5

/2 169279.8 84 or 43 ( 3 F) 4 F°

7

/2 169417.6 61 or 44 ( 3F) 2 F°

4/12( 3F2 )6/Jl/2 (2

1 /2

)° 3

/2 169733.3 73 or 40 ( 3 F) 4 F°

5

/

170669.6 51 or 35 ( 3 F) 2D°

4/ 12( 3 Hs)6p3/2 (5,

3

/2

)° 13

/2 170974.7 100 or 67 ( 3 H) 4 I°

7 /2 171510.4 76 or 45 ( 3 H) 4G°

9

/

171867.0 96 or 34 ( 3 H) 4 H°

U/2 172211.3 99 or 59 ( 3 H) 4 H°

4/i2

( 3H4 )6p3/ 2 (4,3/ 2

)° S

/2 175765.1 56 or 56 ( 3 H) 4G°

ll/2 176127.7 57 or 36 ( 3 H) 2 I°

9

/

176478.9 44 or 28 ( 3 H) 4 I°

7

/

176542.8 51 or 37 ( 3 H) 4 H°

4/ 12

(

1 G4 )6pi/27 /2 177796.3 45 (4,

1 / 2)° or 29 FG) 2F°

4/ 12( 3F3 )6p3/ 2 (3,

3

/ 2

)° 7

/

178036.7 81 or 37 ( 3F) 4F°

5

/2 178049.9 68 or 42 ( 3 F) 4 D°

3

/

60 or 79 ( 3F) 4D°

9

/

178524-6 93 or 60 ( 3 F) 4G°

4/i2(3F2 )6p3/ 2 (23

/ 2

)° 5

/

178684-9 49 or 48 ( 3F) 2F°

l h 77 or 76 ( 3 F) 4D°

3

/

49 or 45 ( 3F) 2D°

7

/

179305.5 68 or 49 ( 3F) 2G°

4/ 12

(

1 D2 )6pi/2

5

/

184497.6 34 (2,V2)° or 30 (!D) 2F°

4/ 12(

1 G4 )6p3/ 2 (4, 3

/2

)° S

/2 1858692 48 or 47 (iG) 2F°

ll/2 185941.1 54 or 54 FG) 2H°

7

/

185972.2 54 or 34 FG) 2G°

9

/

186461.7 53 or 40 (

J G) 2G°

Yb v ( 3 Hs) Limit 351300
LUTETIUM

Lu I

71 electrons Z=71

Ground state (ls 2 2s 2 2p6 3s 2 3p6 3d 10 4s 2 4p6 4d 10 4/ 14 5s2 5p6

) 5d6s 2 2 D:1/2

Ionization energy 43762.39± 0.10 cm" 1 5.42589± 0.00002 eV

Identified even configurations 5d6s 2

, 5d2 6s, 6s 2 7s-14s, 6s2 6d-34d, 6s6p2

, 5d6s7s

Identified odd configurations 6s 2 6p-27p, 5d6s6p, 5d 2 6p?, 6s 2 5/-35/

Main References for Levels, Wavelengths, g Values

In their 1930 paper on the first three spectra of lutetium, Meggers and Scribner noted

that “there is no evidence of /electrons playing any part in the production of the spectra; it is concluded that the fourteen / electrons in Lu form a closed shell of considerable stability.” We

have recognized this stability by writing the ground configurations with the 4/ 14 electrons

included with the other electrons of the N shell, instead of with the external electrons. With

regard to interactions of the 5d, 6s, and 6p electrons, the Lu spectra give a smooth connection

between the rare earths and the Pt (5d) group. In fact Lu I and Lu n are structurally two of

the simplest spectra of the 5d group, rather than rare-earth spectra. In addition to their discovery of the ground term of Lu I, Meggers and Scribner found 15 odd levels. In 1937 these authors published a more complete description of the arc and spark

spectra of lutetium that includes about 250 Lu I lines in the range 2500-10770 A. Except for

the long series of absorption lines measured by Camus and Tomkins (2280-3700 A), this has

remained the main source of Lu I wavelengths in the range covered. Klinkenberg’s extension

of the analysis in 1954 allowed the classification of 124 lines by 51 levels. Most of the energy levels are taken from Klinkenberg and from Camus and Tomkins

[1972], but a number of confirmations, revisions, and extensions of the analysis are based on

additional observations. Zeeman-effect measurements by Anderson [1956] and by Pinnington

[1963], for example, allowed the confirmation, identification, or revision of several levels, and

also some additions. Bovey, Steers, and Wise [1956] observed three infrared transitions that

confirmed the positions of the 6s 2 6p 2 P° levels with respect to the ground term. The 1960

report by these same authors gives about 140 lines between 8578 A and 24612 A, practically all of which apparently belong to Lu I. The authors were able to classify some 50 of these lines and suggest several confirmations and revisions of the analysis.

The accurate g values for the two levels of the ground term were obtained by Ritter

[1962] using the atomic-beam magnetic-resonance technique. The stated error limits are ±0.00008 for the 2 D3/2 level and ±0.00016 for 2 D5/2 .

Even Configurations

Unfortunately, a number of ambiguities and uncertainties remain in the level systems of

both parities. The levels tentatively assigned to the 2 D and 2 P terms of 5d2 6s very likely

belong to this configuration, but calculations of the even levels, and perhaps additional

experimental gvalues, are needed for more definite term assignments. The J values of several

of the 5d 2 6s levels were confirmed or settled by the hfs observations of Horstmann, Noldeke,

and Steudel [1963]. These authors also independently discovered the two levels having J=% at 24711.19 cm" 1 and 25860.76 cm" 1

, but apparently due to a numerical error gave each value

about 3 cm' 1 too high. Their value of 30747.18 cm" 1 for the 2 S 1/2 level is given here, the wide
Lu I —Continued 399

hyperfine splitting of this level having led earlier to the listing of the two components as

different levels. The 2 S I/2 interpretation was confirmed by Pinnington, whose suggested

designations for several of the 5d

2 6s and 6s6p2 levels have been followed. Four of the 5

2 6s

levels and the 6s 2 ('S)7d 2 D5/ 2 level are from Wyart and Verges [1977], who recently began new

work on this spectrum.

Klinkenberg’s 5d6s( :f D)7s 2 D designation for two levels above 42000 cm 1 is given

tentatively. The 2 D character of these levels is evidenced by their combinations, as noted by

Klinkenberg, and also by the observed perturbation of the 6s 2 ('S)nd 2 D2/2 series [Camus and

Tomkins, 1972], apparently due to the level designated 5d6s( :i D)7s 2 D:{/2 (42576.69 cm” 1 ). The

finding of the other 5d6s7s 2 D term would help in the confirmation of both the 5d6s7s

configuration assignment and the 5d6s( :, D) parental designation of these two known levels.

Odd Configurations

The eigenvector percentages and assignments for the (5d6s6p+6s2 7p) group of levels are taken from Camus and Masmoudi. A few of these levels have total percentages of up to 10%

from the 5d 2 6p configuration, which was also included in the calculation. The inclusion of two

levels for the 5/ 2 F° term appears to have significantly affected only the eigenvector of the

level designated 5d6s( :i D)6p 2 F°/2 (31751.17 cm” 1 ); the calculated nominal 5/ 2 F°/2 eigenvector

has a 39% contribution from 5d6s6p, and the other eigenvectors indicate that practically all of

this contribution comes from 5d6s( :! D)6p 2 F°/2 . As an estimate of the effect of eliminating the

5/ 2 F° term from the calculation (see below), we have increased the calculated 53%

5d6s( :! D)6p 2 F°/2 leading component of the affected level by 39%. (The resulting estimate of

92% purity for this level is followed by a question mark.)

The new 6s 2 ('S)7p 2 P°/2 and 5d6s( , D )673

2 F°/2 levels are from Wyart and Verges [1977]. The

eigenvectors for the nominal 6s 2 (’S)7p 2 P° levels have strong admixtures from 5d6s6p (not

shown here). Two eigenvector assignments may not be conclusive, and the J value of the level at 29607.98 cm-1 is given as questionable; Gobel’s [1971] level-crossing observations gave a J

value of 3/2 for this level whereas Pinnington interpreted the Zeeman pattern of the 3376.50 A

resonance line as giving a J value of 5

/2 .

Series, Ionization Energy

All the higher 6s 2 ('S)n( series members of both parities are from the paper by Camus and

Tomkins, who photographed the absorption spectrum in the region 2280-3700 A with the

Argonne 30-foot spectrograph. The n values originally assigned to the 6s

z nf series members

have been decreased by unity, and the original 5/ 2 F° levels are omitted as probably not belonging to these series [Kaufman and Sugar, 1973; Camus, 1976]. Camus and Tomkins found

significant perturbations of all but the 6s 2 nf 2 F°l2 series; the quoted limit was derived by them

from this series.

References

Anderson, J., Thesis, Imperial College, London, 89 pp. (1956). EL ND ZE

Bovey, L. F. H., and Carton, W. R. S., Proc. Phys. Soc. London, Sect. A 67, 291 (1954). W

Bovey, L. F. H., Steers, E. B. M., and Wise, H. S., Proc. Phys. Soc. London, Sect. A 69, 783 (1956). EL CL W

Bovey, L., Steers, E. B. M., and Wise, H. S., U. K. Atomic Energy Research Establishment Rep. AERE-R 3225, Harwell, 8 pp. (1960). EL CL W

Camus, P., Thesis, Univ. Paris-Sud, Orsay, 265 pp. (1971). EL CL W IP SF

Camus, P., private communication (1976). Camus, P., and Masmoudi, K., Physica (Utrecht) 60, 513 (1972). EL ND ZE PT

Camus, P., and Tomkins, F. S., J. Phys. (Paris) 33, 197 (1972). EL ND CL W IP

Gobel, L. H., Z. Naturforsch., Teil A 25, 1401 (1970). ZE Hfs

Gobel, L. H., Z. Naturforsch., Teil A 26, 1559 (1971). ND Hfs

Horstmann, U., Noldeke, G., and Steudel, A., Ann. Phys. (Leipzig) [7] 12, 14 (1963). EL ND CL Hfs Kaufman, V., and Sugar, J., J. Opt. Soc. Am. 63, 1168 (1973). EL ND

King, A. S., Astrophys. J. 74, 328 (1931). W Hfs

Klinkenberg, P. F. A., Physica (Utrecht) 21, 53 (1954). EL ND CL IP
400 Lu I —Continued

Masmoudi, K., Thesis, Univ. Paris-Sud, Orsay, 130 pp. (1972). ND PT

Meggers, W. F., and Scribner, B. F., J. Res. Nat. Bur. Stand. (U.S.) 5, 73 (1930). EL CL W

Meggers, W. F., and Scribner, B. F., J. Res. Nat. Bur. Stand. (U.S.) 19, 31 (1937). W

Pinnington, E. H., Can. J. Phys. 41, 1294 (1963). EL ND CL ZE Hfs

Ritter, G. J., Phys. Rev. 126, 240 (1962). ZE Hfs

Wyart, J. F., and Verges, J., unpublished material (1977). EL

[October 1976]

Lu I, Even Parity Lu i. Even Parity

Configuration Term J

Level (cm -1

) 9

Configuration Term J

Level (cm -1

) 9

5d( 2 D)6s2 2 D 3

/2 0.00 0.79921 6s6p2?

X /2,3

/ 2 41367.82

S

/2 1993.92 1.20040

6s2

(

1 S)10d 2 D 3

/

2

41605.46 5d2

( 3 F)6s 4p 3

/

2

18851.31 5

/

2

5

/2

7

/

2

9

/2

19403.31 1.04 6s2

(

1 S)12s 2 S 41798.10

6s2

(

x S)lld 2 D 3

/

2

42092.30 5d2

( 3 P)6s 4p 1 h 21472.33 5/2

3

/

2

22467.53 1.73

5

/2 25860.76 1.60 6s2

(

1 S)13s 2 S

X /2 42359.48

6s2

(

1 S)7s 2 Sl /2 24125.86 2.05 6s2

(

x S)12d 2 D 3

/2 42430.16

5

/2 5d2

(

x D?)6s

5d 2 (‘G)6s

2 D? 3 /2

5

/

2

V /2

24518.16

24711.19 5d6s(3 D)7s? 2 D 3

/

2

5

/

2

42576.69 44075.53

2 G 26570.40

9

/

2

26671.32 6s2

(

x S)14s 2 S

X /2 42649.05

5d 2

(

3 F)6s 2 F

5 /2

7

/

2

27991.75

6s2

(

x S)13d 2 D 3

/

2

5

/2

42722.50

5d2

( 3P?)6s 2 P? V2 28793.34 0.98

3

/

2

29937.81 6s2

(

x S)14d 2 D 3

/

2

5

/

2

42873.15

5d2

(

x S)6s 2 S V2 30747.18 2.2 6s2

(

x S)15d 2 D 3

/

2

43008.42

6s2

(

x S)6d 2 D 3

/

2

31542.24 0.80 5

/

2

S

/2 31713.60 1.23 6s2

(

x S)16d 2 D 3

/

2

43112.80

6s6p2 4 P V2 32986.75 2.62 5

/2

3

/

2

33831.54 1.75

5

/ 35274.55 1.51 6s2

(

x S)17d 2 D 3

/

2

S

/2

43236.65

6s2

(

1 S)8s 2 S

l h 34610.38

6s2

(

x S)18d 2 D 3

/2 43291.10

6s2

(

1 S)7d 2 D 3

/

2

36768.81 5

/2

5 /2 36952.93

6s2

(

x S)19d 2 D 3

/

2

43344.18

5d6s(3 D)7s 4 D 1 l* 36899.72 0.00 5

/

2

3

/

2

37193.98 1.27

5

/ 37742.56 1.29 6s2

(

x S)20d 2 D 3

/

2

43390.24

7

/

2

39279.48 1.39

S

/2

6s2

(

1 S)9s 2 S

l h 38458.36 6s2

(

x S)21d 2 D 3

/

2

5

/2

43429.54

6s2

( x S)8d 2 D 3

/

2

38828.77

5

/2 6s2

(

x S)22d 2 D 3

/

2

5

/

2

43463.10

6s2

(

l S)10s 2 S

X /2 40282.01

6s2 43491.88 ( x S)23d 2 D 3

/

2

6s2

(

1 S)9d 2 D 3/2 40901.01 5

/

2

5/2 6s2

(

x S)24d 2 D 3

/

2

43516.76

6s2

( 1 S)lls 2 S V2 41120.27 5

/

2
401

Lu i. Even Parity—Continued Lu I, Even Parity—Continued

Configuration Term J

Level (cm ') g Configuration Term J

Level (cm *)

6s2

(

1 S)25d 2 D 3

/2 43538.42 6s2

(

l S)31d 2 D 3

/

43623.82

5

/2 5

/2

6s2

(

1 S)26d 2 D 3

/2 43557.30 6s2

(

1 S)32d 2 D 3

/

43633.23

5

/2

5

/

6s2 (‘S)27d 2 D 3

/

43573.94 6s2 (‘S)33d 2 D 3/

43641.79

5

/2

5

/

6s2 (*S)28d 2 D 3/2 43588.68 6s2

(

1 S)34d 2 D 3

/

43649.10

5

/

5

/2

6s2

(

1 S)29d 2 D 3

/2 43601.73

5

/

Lu II OSo) Limit 43762.39

6s2

(

1 S)30d 2 D 3

/2 43613.30

S/2

Lu I, Odd Parity

Configuration Term J

Level

(cnrr 1 ) g Leading percentages

6s2 (*S)6p 2p° U36.00 0.66

3

/

7476.35 1.33

5d6s(3 D)6p 4p° 3/

1742728 0.50 90 or 62 5d(2 D3/2)6s6p(3Po)

S /2 18504.56 1.07 87 or 74 5d( 2 U3/2 )6s6p( 3 Pi)

7

/

20432.53 1.22 97 or 55 5d(2 D5/ 2 )6s6p(3 P?)

9

/

22609.46 1.30 100 or 100 5d(2 D5/2)6s6p( 3 P2 )

5d6s(3 D)6p 4 D

° 1 h 20762.42 0.00 92 or 86 5d(2 D3/ 2 )6s6p(3 Pi)

3

/

21195.37 1.19 89 or 34 5d(2 D3/ 2 )6s6p(3Pi)

5

/

22221.64 1.39 78 or 49 5d( 2 D3/ 2 )6s6p(3 Po)

7

/

2352424 1.41 96 or 53 5d(2 D5/ 2 )6s6p(3P2 )

5d6s(3 D)6p 2 D° 5

/ 2 21462.35 1.23 40 or 68 5d(2 D3/2 )6s6p(3P2 ) 3

/ 2 22124-70 0.874 58 or 52 5d(2Ds/2 )6s6p( 3 P?)

5d6s(3 D)6p 4P° V2 24108.72 96 or 91 5d( 2 D3/2 )6s6p(3P2 ) 3

1 2 2430820 1.67 83 or 50 5d( 2 D3/ 2 )6s6p(3 P2) S

/2 25191.57 1.53 81 or 55 5d(2 D5/2 )6s6p(3P2 )

6s2

(

1 S)7p 2 P° V2 29430.90 62

3

/ 2 30488.62 1.23 53

5d6s0D)6p 2 F° 5

/2 28020.18 0.88 75 or 39 5d(2 D3/ 2 )6s6p( 1 Pf)

7

/ 2 29486.94 90 or 32 5d( 2 D3/ 2 )6s6p(3 P§)

5d6s( 1 D)6p? 3

/ 2 ? 29607.98 32 2 D° or 42 5d(2 D3/ 2 )6s6p( 1 P?)

5d6s(3 D)6p 2 F° 5

/

30183.55 69 or 45 5d(2 D3/ 2 )6s6p( 1 P!)

? /2 31751.17 92? or ? 5d( 2 D5/ 2)6s6p( 1 P!)

5d6s( 1 D)6p 2 P° 3

/ 2 31523.14 56 or 51 5d(2 D5/2 )6s6p( 3 P2 ) %

X /2 3344320 81 or 40 5d( 2 D5/ 2 )6s6p( 3 P2 )

5d6s(3 D)6p 2 P° V2 32058.1 59 or 44 5d(2 D5/2 )6s6p( 3 P2 ) 3

/2 34436.49 44 or 58 5d(2 D5/2 )6s6p( 1 P?)

5d6s( 1 D)6p? 5/2 32456.87 46 2 D° or 61 5d( 2 D3/ 2)6s6p( 1 P?)

6s2

(

1 S)5/ 2 F° 5

/2 36633.31

7 /2 36644-12

225-298 0 - 78 - 26
402

Lu I, Odd Parity—Continued Lu I, Odd Parity—Continued

Configuration Term J

Level (cm -1

) 9 Configuration Term J

Level (cm -1

)

6s2

(

, S)8p 2 P° V2 36808.76 fo’CSHOp 2p° V2 43258.71

3

/

2

37131.38 3

/ 2

6s2

(

1 S)6/ 2 F° 5

/ 2 39212.61 6s2

( 1 S)16/ 2 F

° 5

/2

7

/ 2 39220.1

7

7 /2 43267.57

6s2

(

l S)9p 2 P° V2 39321.96 6s2 (*S)17/ 2 F

° 7

/

2

43327.84

3

/

2

39424-68 5/2 43332.57

5d

2 6p? 5

/2 40558.63 6s2(>S)20p 2P° */2 43328.46

3

/

2

43336.86

6s2

(

1 S)7/ 2p° 7/2 40619.01

5

/

2

40626.82 6s2

(

1 S)18/ 2 F

° 7

/

2

43377.74

5

/

2

43379.31

6s2

(

1 S)10p 2P° V2 40661.02

3

/

2

40735.33 6s2

(

1 S)21p 2 P° V2 3/2 J

43384-56

6s2

(

1 S)8/ 2 F° 5

/ 2 4145626

7

/

2

41460.08 6s2 (*S)19/ 2 F

° 7 /2 43419.54

5

/2 43420.1

6

6s2

(

1 S)llp 2p° V2 41487.02

3

/

2

41533.30 6s2

(

1 S)22p 2p° V2 43423.85

3

/

2

43425.08

6s2

(

l S)9/ 2 F° 5 /2 42000.72

7

/

2

42006.00 6s2

(

1 S)20/ 2 F

° 7 /2 43454.87

5

/2 43455.08

6s2

(

1 S)12p 2P

0 V2 42021.84

3

/

2

42052.89 6s2(

1 S)23p 2 p

° V2 43457.65

3

/

2

43459.47

6s2

(

1 S)10/ 2 F

° 5

/2 42372.94

7 /2 42376.66 6s2

(

I S)21/ 2 F

° 5

/2 43485.01

7

/

2

43485.01

6s2

(

1 S)13p 2 p

° V2 42386.76

3 h 42414.79 6s2

(

1 S)24p 2p

° V2 43487.15

3

/

2

43488.91

6s2

(

1 S)ll/ 2 F

° 5/2 42638.48

7 /2 42642.05 6s2

(

1 S)22/ 2 F

° 5/2 43510.81

7

/

2

43510.93

6s2

(

1 S)14p 2 P° V2 42657.69

3

/

2

42667.06 6s2

(

1 S)25p 2 p

° V2 43512.65

3

/

2

4351429

6s2

(

1 S)12/ 2 F° 5

/2 42834-43

7 /2 42837.99 6s2

(

1 S)23/ 2 F

° 5

/2 43533.18

7

/

2

43533.38

6s2

( 1 S)15p 2 P° V2 42848.31

3 /2 42855.91 6s2

(

1 S)26p 2 P° V2 43534.90

3

/

2

4353623

6s2

( 1 S)13/ 2 F° 5

/

2

42982.79

7 /2 42986.69 6s2 ('S)24/ 2 F

° 5

/2 43552.71

7

/

2

43552.95

6s2

( 1 S)16p 2 p

° V2

3

/ 2 43002.55 6s2

(

1 S)27p 2 P° V2

3

/ 2 4355528

6s2

( 1 S)14/ 2 F° 5 /2 43098.15

7

/ 2 43102.31 6s2

( 1 S)25/ 2 F

° 5 /2 43569.85

7

/ 2 43570.13

6s2

(

1 S)17p 2P° V2

3

/ 2 43111.69 6s2

( 1 S)26/ 2 F

° 5

/ 2 43584-98

7 /2 4358527

6s2 (>S)15/ 2 F

° 5 /2 4318828

7

/ 2 43193.85 6s2

( 1 S)27/ 2 F

° 5/2 43598.40

7 /2 43598.68

6s2

(

1 S)18p 2P° V»

3

/ 2 43197.07 6s2

(

1 S)28/ 2 F

° 5

/ 2 43610.34

7 /2 43610.66
403

Lu I, Odd Parity—Continued Lu I, Odd Parity—Continued

Configuration Term J

Level (cm -1

) 9 Configuration Term J

Level (cm -1

) 9

6s2

(

1 S)29/ 2 jr ° 5/2 43621.02 6s2

(

1 S)34/ 2 F° S/2 43660.81

7

/

43621 £8 7

/

43660.95

6s2

(

1 S)30/ 2 F° S

/2 43630.64 6s2

(

1 S)35/ 2 F° S

/2 43666.72

7

/

43630.88 7

/

43666.85

6s2

(

1 S)31/ 2 F

° 5

/ 2 43639.31

7

/ 2 43639.58 Lu II (>So) Limit 43762.39

6s2

(> S)32/ 2 F

° S

/2 43647.13

7 /2 43647.34

6s2

(

1 S)33/ 2 F

° 5

/4365423

7

/43654-47
404

Lu II

(Yb i sequence; 70 electrons) Z~ 71

Ground state (ls 2 2s 2 2p6 3s 2 3pfi 3d 10 4s 2 4p6 4d 10 4/ 14 5s2 5p6

) 6s 2 >S 0

Ionization energy 112000± 3000 cnrT 1 13.9± 0.4 eV

Sometime before 1935 W. F. Meggers supplied H. N. Russell at Princeton with an

extension of Meggers’ and Scribner’s original analysis of Lu ii [1930], Most of the levels here

are taken from an unpublished term list prepared in 1935 from Meggers’ analysis [Meggers,

1935]. The values were given to two decimal places, except for four of the higher even levels. (The probable error for all of the levels appears to be about ±0.10 cm' 1 .) The remaining levels are taken from the 1956 report by Bovey and Pearse. They correctly

designated the 5d

1 'D 2 level, added the 5d

2 ! P 0 , 5d6p l P°, and 6s7s levels, and also found a number of other levels beginning above 47000 cm'1

. A number of tentative levels listed by

Bovey and Pearse have been omitted, pending confirmation by more complete observations of

the spectrum. (The omitted levels lie in the range from 47447 cm"1 to 83994 cm" 1 .) Bovey and

Pearse noted that these levels needed confirmation, since they were mainly based on very

weak lines. The possible even level at 79546.8 cm" 1 was listed tentatively by Meggers and by

Bovey and Pearse. The provisional 6s6d 3 D and 5d7s 3 D terms follow the arrangement of

Bovey and Pearse.

Theoretical Interpretation

The eigenvector percentages are taken from Goldschmidt’s calculations of the (5d+6s)2 and

(6s6p+5d6p) configurations [1968], The percentages for the (5d+6s)2 group show that 5d

2 3 P2 and 5d

2 'D 2 have little meaning as designations because of the strong mixture of these terms

in two of the eigenvectors (levels at 36098.18 and 38574.94 cm" 1 ); we have retained the usual

( P 2 designation for one of the levels, mainly to fill out the 5d

2 3 P term. The experimental g

factors for the two levels are not sufficiently reliable to afford a test of the eigenvectors (see

below).

A tentative value of 37826.8 cm" 1 suggested by Anderson [1956] for the 5d

2 ! G4 level has

been omitted. The experimental evidence for the level is not convincing, and a large

perturbation would be required for the level to be so far below the position near 39000 cm"1 predicted by Goldschmidt.

Goldschmidt [1967] discusses the interaction between the 6s6p and 5d6p configurations. A

calculated repulsion of 8500 cm"1 between the two 1 P° levels is reflected in the strong mixture

of configurations in the two corresponding eigenvectors (levels at 38223 and 59122 cm 1 ). Calculations for several two-electron spectra, including Lu n, were important in obtaining

reliable values of theoretical parameters needed for comparison, or for use as initial values in calculations of more complex rare-earth spectra.

g Values

The g values are from Zeeman-effect measurements by Anderson [1956] and by

Pinnington [1963], Anderson’s observations having included patterns confirming all the known

levels with J= 0. Pinnington’s g values are listed for the seven levels involved in his measurements, the stated uncertainties being ±0.02 or ±0.03. Three of the g values are followed by colons to indicate that each is well outside the range of allowed values (for the

pertinent J value) unless interactions with quintet or higher multiplicity terms are significant.

(Such terms would arise from excited-core configurations.) Pinnington’s g value of 1.41 for the

5d6s ;! D :i level appears to be confirmed to about ±0.02 by the patterns for three different lines,

and his g value of 1.66±0.02 for the 6s6p :, P2 level was obtained from one of these same

patterns; the theoretical upper limits for the g values of these two levels (higher multiplicities

excluded) are 1.33 and 1.50, respectively. The possible effects of hfs on these patterns should
Lu II —Continued 405

perhaps be investigated. Anderson’s g value of 0.43 for the 5d6p f D° level (theoretical lower

limit, 0.50) may be less accurate than Goldschmidt’s calculated value of 0.58. The three g values followed by question marks are dubious. Anderson’s value of 1.37 for

the g values of both the 5d

2 level at 36098 cm' 1 (J= 2) and the 5d6p 'P° level was based entirely on a simple triplet Zeeman pattern observed for the transition between these levels. The g

value of 1.49 for the (nominal) 5d

2 :i P 2 level was then obtained from another triplet pattern by

assuming the g value of 1.37 for the 5c?6p 'P° level. Goldschmidt’s calculations predict g values

of about 1.25 for each of the two 5d

2 levels in question, and a value of 1.01 for the 5d6p *P°

level. Anderson’s g values for the two 5d

2 levels cause a large deviation from the p-sum rule for the (5d+6s)2 levels having J=2, and his g value for the 5d6p *P° level cannot be accurate if the level is correctly assigned.

Line Lists, Ionization Energy

New and more complete observations of Lu I and Lu II are needed. The basic line list for

Lu II at present is the one published by Meggers and Scribner in 1937, which gives 370 lines in the range 2065-10758 A. Bovey and Pearse give a complete list of the classified lines, and also include tables showing the intensities of the combinations of each level. The ionization energy is from Sugar and Reader [1965].

References

Anderson, J., Thesis, Imperial College, London, 89 pp. (1956). EL ND ZE

Bovey, L. F. H., and Pearse, R. W. B., U. K. Atomic Energy Research Establishment Rep. AERE C/R 1976, Harwell,

19 pp. (1956). EL CL IP

Goldschmidt, Z. B., Colloq. Int. C.N.R.S. No. 164, 365 (1967). PT

Goldschmidt, Z. B., Thesis, Hebrew Univ. Jerusalem, Israel, 487 pp. (1968). PT

King, A. S„ Astrophys. J. 74, 328 (1931). W Hfs

Meggers, W. F., unpublished material (1935). These data were assembled by C. E. Moore at Princeton. EL CL

Meggers, W. F., and Scribner, B. F., J. Res. Nat. Bur. Stand. (U.S.) 5, 73 (1930). EL CL W

Meggers, W. F., and Scribner, B. F., J. Res. Nat. Bur. Stand. (U.S.) 19, 31 (1937). W

Pinnington, E. H., Can. J. Phys. 41, 1305 (1963). ZE

Sugar, J., and Reader, J., J. Opt. Soc. Am. 55, 1286 (1965). IP

[July 1976]

Lu II

Configuration Term J

Level (cm -1

) 9 Leading percentages

6s2 0 0.00 98

5d6s 3 D 1 11796.24 0.52 100 2 12435.32 1.14 94 3 14199.08 1.41: 100

5g?6s »D 2 17332.58 1.09 85 9 5d

2 *D

6s6p 3 P° 0 2726U-W 99

1 28503.16 1.51 94 2 321,5326 1.66: 98

5d

2 3 F 2 29406.70 0.66 97 3 30889.09 1.05 100 4 32503.62 1.27 98

5d

2 sp 0 35652.1 98

1 36557.05 1.41 100 2 38574.94 1.49? 51 44 ‘D

5d

2 2 36098.18 1.37? 49 3P 45 *D

6s6p i P

° 1 38223.1,9 0.99 56 34 5d6p 1 P°
406

Lu II—Continued

Configuration Term J

Level

(cm~‘) 9 Leading percentages

5d6p 3 F

° 2 41224-96 0.71 70 27 1 D°

3 U918.68 1.08 93 4 48536.83 1.25 100

5d6p x D

° 2 h5h58.56 0.94 60 24 3 F

°

5d6p 3 D° 1 U5532.33 0.43: 89 2 Jt6901f.38 1.13 87 3 k8733.19 1.30 79 14 iF°

5d6p 3p° 0 U9963.58 99

1 5004920 1.43 90 2 51201.66 1.37 82 9

i D

°

5d6p >F° 3 53079.33 1.02 85 15 3 D°

5d6p >P° 1 59122.4 1.37? 64 30 6s6p l P°

6s7s 3 S 1 63774.3 2.05

6s7s l S 0 68988.80

6s6rf? 3 D? 1 71169.1 2 71705.1 3 72735.6

2,3 72016.6

5d7s? 3 D? 1 73453.0 2 74122.2

3 75717.6

1,2 73588.3

5rf6d? 2? 79546.8?

Lu ill ( 2 Si/2 ) Limit 112000
407

Lu III

(Tm i sequence; 69 electrons) Z=71

Ground state (ls 2 2s2 2p 6 3s2 3p6 3d'°4s 2 4p6 4d 10 4/ 14 5s2 5p6

) 6s 2 S 1/2

Ionization energy 169049± 10 cm 1 20. 9596± 0.0012 eV

Kaufman and Sugar [1971] photographed this spectrum over the region 400 to 9000 A. They note that the “simple one-electron spectrum is superimposed on the complex threeelectron spectrum arising from the excitation of an electron out of the 4/ shell.” Although they

found levels of the (4/

13 5d 2 +4/ 13 5d6s+4/ 13 6s 2

) group, the published results were limited to the

simple one-electron configurations given here, which classify about 70 lines from 677 to 8009 A. The strongest of these lines belong to the 6s —6p and 5d —6p multiplets (2236—3058 A) first classified by Meggers and Scribner [1930]; their classifications of two of the lines were later correctly interchanged by Steudel [1958],

One of the levels from the more complex configurations, the odd level at 128057.3 cm 1 with /=%, is included here; “the inversion of the 6/ 2 F° term appears to have been caused

mainly by interaction” between this level and the 6f

2 Fll2 level. Kaufman and Sugar gave all levels or hyperfine-structure levels of 175 Lu in with respect

to the ground hyperfine level, 6s 2 S 1/2 (F=3) at 0.000 cm 1

, the F=4 hfs level being 1.746±0.010

cm" 1 higher. Their table includes hfs intervals for the 6s-8s, 6p, and 7p levels. The values

given here for these levels are the baricenters of the corresponding hfs levels, with the hfs

baricenter of the ground level being taken at 0.00 cm

-1

. The uncertainties are 0.1 cm 1 for all levels except those of 8/ and 9f which are uncertain by ±1.0 cm

-1

. Kaufman and Sugar derived the quoted ionization potential from the ns series.

References

Heilig, K., and Kasten, P., Naturwissenschaften 54, 338 (1967). Hfs Kaufman, V., and Sugar, J., J. Opt. Soc. Am. 61, 1693 (1971). EL CL W Hfs IP Meggers, W. F., and Scribner, B. F., J. Res. Nat. Bur. Stand. (U.S.) 5, 73 (1930). EL CL W

Meggers, W. F., and Scribner, B. F., J. Res. Nat. Bur. Stand. (U.S.) 19, 31 (1937). W

Steudel, A., Z. Phys. 152, 599 (1958). EL CL Hfs

[July 1976]

Lu III Lu III

Configuration Term J

Level (cm -1

) Configuration Term J

Level (cm -1

)

4/ 14(

1 S)6s 2 S

l h 0.00 4/ 14

(

1 S)6/ 2 F° 7

/ 2 128799.8

4/14(

x S)5d 2 D 3h 5707.6

3

1 2 1290532

3

1 2 8647.8 4/ 14

(

1 S)5p 2G 7

/ 2 129105.4

4/14

(

1 S)6p 2p° 1 h 381,00.61

9

/ 2 129106.3

3

1 2 4470521 4/14

( 1 S)9s 2 S

X /2 136209.86

4/14( 1 S)7s 2 S

l /2 86681.21 4/ 14

(

1 S)7/ 2 F° 3

! 2 11,1069.6

4/14(

1 S)6d 2 D 3

/ 2 92321.6

7

/ 2 11,10922

5

/2 93107.6 4/ 14

(

1 S)10s 2 S

l /2 145587.3 4/ 14

(

1 S)7p 2 P° X /2

3

1 2

100357.09

102810.82 4/14

(

1 S)8/ 2 F° 3

1 2

7

/ 2

148513.8

148530.0 4/14

(

x S)5/ 2jr° 5

/ 2

? /2

105590.6 105704.1 4/ 14

(

1 S)9/ 2 F

° 3

1 2

7 /2

153343.6

153354.5 4/ 14

(

x S)8s 2 S

1 h 119784.75

4/14

(

1 S)7d 2 D 3

1 2 122622.5 Lu iv (»So) Limit 169049

5

/ 2 122981.0

. . 5h 128057.3
408

Lu IV

(Er i sequence; 68 electrons) Z=71

Ground state (ls z 2s 2 2p6 3s 2 3p6 3d 10 4s 2 4p6 4d 10 5s 2 5p6

) 4f

u 1 S0

Ionization energy 364960± 200 cm 1 45.25± 0.03 eV

One immediate advantage of the analysis of this spectrum was that the results could be

combined with certain known regularities to give predicted values for fundamental energy

differences of the type 4f

N —4/N ' 1 5d in the fourth and fifth spectra of the lanthanides [Sugar

and Kaufman, 1972], The 57 known energy levels of Lu IV include nearly all levels of the listed configurations. The line list obtained from a sliding-spark source includes 246 lines over the

range 876-2130 A, with about 70% of the lines being classified. “The uncertainty of the levels relative to the lowest level of 4/ 13 5d is about ±0.1 cm’1

, but relative to the ground state it is ±0.5 cm’ 1 ," the latter connection being based on the wavelengths of the three resonance lines from the 4/ 13 5d levels having J= 1. Leading percentages in the /, j coupling scheme are given for all excited levels. Sugar and

Kaufman found that the lowest average purity in this scheme was 91% for 4/ 13 5d, whereas the

LS purity of this configuration is 65%. The 4/ 13 6s and 4/ 13 7s configurations have 100% purity

in J x j coupling; in LS coupling the two levels having J=3 share the l F° and 3 F° percentages

almost equally.

Wyart, Blaise,' and Camus [1974] give the parameter values obtained from a calculation of

(4/

13 5d+4/ 13 6s) including configuration interaction.

Kaufman and Sugar [1976] obtained the 4/ 13 2 F°/2 limit position from the 4/ 13 6s, 7s series

and an adopted value for the difference in the quantum defects of the two members. The

uncertainty arises from their estimated uncertainty in the latter quantity.

References

Kaufman, V., and Sugar, J., J. Opt. Soc. Am. 66, 1019 (1976). IP

Sugar, J., and Kaufman, V., J. Opt. Soc. Am. 62, 562 (1972). EL CL W IP PT

Sugar, J., and Reader, J., J. Chem. Phys. 59, 2083 (1973). IP Wyart, J. F., Blaise, J., and Camus, P., Phys. Scr. 9, 325 (1974). PT

[July 1976]

Lu IV

Configuration Term J

Level (cm -1

) Leading percentages

4/!4 0 0.0

4/ 13( 2 F?/2 )5d3/2 ( 7

/ 2,3

/ 2

)° 2 90432.9 83 15 ( 7

/ 2 , 5/ 2

)° 5 94768.1 97 3 97333.6 96 4 98558.5 95

4/l 3

( 2 F7/ 2)5d5/2 ( 7

/2,

5

/ 2

)° 6 98239.3 100

1 98505.0 64 21 ( 5

/ 2,3

/2

)° 2 99660.0 84 16 ( 7

/ 2,3

/ 2

)° 4 102216.6 92 3 1030704 94 5 103798.7 96

4/13( 2 F5/2 )5cZ5/ 2 ( 5

/2,5/ 2

)° 0 105148.7 100

1 110858.0 81 14 ( 5/ 2, 3/ 2

)° 5 111377.8 97 2 112632.5 97 3 114632.8 97 4 1151,68.5 97
Lu IV—Continued

Configuration Term J

Level (cm^ 1

) Leading percentages

4yi3(2Fg/2 )5d3/2 ( 5

/2,3 /2)° 4 106380.6 90 2 107986.6 97 3 111812.3 98

1 11U0U9.U 65 31 ( 7

/ 2, 5/ 2

)°

4/13( 2 F7/2)6Sl/2 ( 7

/2,

1

/ 2

)° 4 116798.2 100 3 117312.0 100

4/13(2 F5/2 )6Sl/2 2 128573.3 100 3 128929.0 100

4/13

( 2 F7/2 )6pi/2 ( 7 /2//2 ) 3 164302.3 98

4 164728.5 100

4/i3

( 2 F7/2 )6p3/ 2 ( 7

/ 2 , 3/2 ) 5 173213.6 100 2 173414.4 98 3 174143.2 94 4 174889.9 100

4/i 3

( 2 F5/2 )6pi/2 ( 5 /2,X/2) 3 176355.6 95 2 176841.6 97

4/l3

( 2 F5/2 )6p3/2 ( 5

/2,3/ 2 ) 1 184205.5 100 4 185359.8 100 2 185987.0 98 3 186539.6 99

4/ l3 (2F7/2 )6d3/ 2 ( 7

/2,3/ 2

)° 2 235663.7 87 13 ( 7

/2,5/ 2

)° 5 236667.1 98 3 237215.3 96 4 2371,36.9 95

4/ 13( 2 F?/2 )7si/ 2 ( 7

/2,

1 /2

)° 4 237025.1, 100 3 237106.7 100

4/X3(2F7/2 )6d5/2 ( 7

/2, 5/ 2

)° 6 237663.7 100 2 23791,6.8 87 13 ( 7

/2,3/ 2

)° 4 238501.1 95 3 23871,0.5 96

1 97 5 238907.7 98

4/13(2F5/2)6d3/2 ( 5

/2, 3/2)° 4 21^8305.8 97 2 248620.5 98

1 21,9510.0 69 31 ( 5/2,5/ 2

)° 3 249682.5 99

4/l 3

( 2 F5/2)7Sl/2 ( S

/2,

1 /2)° 2 248900.6 100 3 248965.9 100

4/ 1 3(2FI/2 )6d5 / 2 ( 5

/2, 5/ 2

)° 0 100

1 68 29 ( s

/ 2, 3/ 2)

0

5 249719.0 100 2 249954-0 98 3 99 4 250789.5 97

Lu v (2 F7/2) Limit 364960
410

Lu V

(Ho i sequence; 67 electrons) Z=71

Ground state (ls 2 2s 2 2p6 3s2 3ps 3d 10 4s 2 4pfi 4d 10 5s 2 5pfi ) 4/ 13 2 F°/2

Ionization energy 538700± 2700 cm 1 66.8± 0.3 eV

Sugar and Kaufman [1972] gave the 4/ 13 2 F° interval for this spectrum in their paper on Lu IV. They have classified more than 50 Lu v lines in the region 500-700 A as transitions

from 4/ 12 5d levels to the ground-term levels [Sugar and Kaufman, 1973]. The eigenvector

percentages for the upper levels are also from their unpublished material. Leading

percentages in both J x j and LS coupling are given; neither scheme is a good approximation.

An extension of this analysis is planned.

Sugar [1975] obtained the ionization energy by a method similar to that of Sugar and

Reader [1973],

References

Sugar, J., J. Opt. Soc. Am. 65, 1366 (1975). IP

Sugar, J., and Kaufman, V., J. Opt. Soc. Am. 62, 562 (1972). EL

Sugar, J., and Kaufman, V., unpublished material (1973). EL PT

Sugar, J., and Reader, J., J. Chem. Phys. 59, 2083 (1973).

[July 1976]

Lu v

Configuration Term J

Level (cm -1

) Leading percentages

4/ 13 2 F° 7 /2 0.0

5

/

2

11792.8

4/ 12( 3 H6 )5d5/2 7 /2 150765.0 34 (6

,

5

/ 2 ) or 38 ( 3 H) 4F

4/ 12( 3 F4 )5d3/ 2 9/2 154986.5 39 (4,

3

/ 2 ) or 20 ( 3 F) 4 G

4/12( 3 H6 )5ds/2 9

/

2

156855.6 34 (6,

5

/ 2 ) or 34 ( 3 H) 4G

4/ 12

( 3 H6 )5d5/2 7 /2 158983.3 40 (6,

5

/2 ) or 72 ( 3 H) 2 F

4/ 12( 3 H5 )5d5/2

5

/2 159035.8 35 (5,

5

/ 2 ) or 55 ( 3 H) 4 F

4/ 12( 3F4 )5d3/ 2 5/2 161973.0 29 (4,

3

/ 2) or 27 ( 3 F) 4P

4/12( 3 F4 )5ds/2 7 /2 162558.9 34 (4,

5

/ 2 ) or 27 ( 3 F) 4 D

4/12( 3F4 )5ds/2 (4,5

/ 2 ) 9

/

2

162806.4 56 or 35 ( 3 F) 4 F

4/12

( 3 H5 )5d5/2 7/

2

164200.2 37 (5,

5

/ 2) or 18 ( 3 F) 4 H

4/12( 3 F3 )5d3/2 (3

,

3

/ 2 ) 3

/

2

164665.8 47 or 42 ( 3 F) 4 D

4/i 2

( 3 F3 )5d3/2 7/

2

166576.0 33 (3,

3

/ 2 ) or 27 ( 3 H) 4G

4/ 12( 3 H5 )5d5/2 S/2 167222.3 42 (5,

5

/ 2) or 40 ( 3H) 2F

4/i2( 3 F2 )5d3/ 2

3

/

2

168013.2 27 (2,

3

/ 2) or 38 ( 3 F) 2P

4/ 12

( 3 F2 )5d3 / 2

? /2 168669.8 41 (2,

3

/ 2) or 30 ( 3 F) 4 H

4/i2(3 F3 )5d3 / 2

7 /2 170023.8 26 (3,3

/ 2 ) or 33 ( 3F) 2 F

4/ 12

( 3 F3 )5d3/ 2 9

/

2

170638.6 42 (3,

3

/ 2 ) or 24 ( 3F) 4 H

4/ 12( 3 H4 )5ds/2

5

/

2

171005.9 42 (4,

5

/ 2 ) or 32 ( 3 H) 4G

4/ 12

( 3 H4 )5ds/2 3 /2 171573.5 40 (4,

5

/ 2) or 40 ( 3 H) 4 F

4/ 12( 3 F2 )5ds/2 7 /2 172807.3 38 (2,

5

/ 2 ) or 23 ( 3 F) 2G
Lu V

Continued

Configuration Term J

Level (cm ’) Leading percentages

4/ 12( 3 F3 )5d5/2 (3,

5

/ 2 ) 5

/

173521.8 51 or 29 ( 3 F) 4 D

7

/

174276.4? 75 or 34 ( 3 F) 2 G

9

/

174907.1 61 or 30 ( 3F) 2 H

3

/2 38 or 76 ( 3 F) 4 P

l h 49 or 62 ( 3 F) 4 P

ii/ 2 64 or 37 ( 3F) 4 H

4/ 12(>G4)5d5/2 7

/

175655.4 25 (4,

5

/ 2) or 21 ( 3 H) 4 H

4/12(

1 G4 )5d3/2 9

/2 177392.4 37 (4,

3

/ 2) or 25 ( 3 H) 4

I 4/ 12

( 3 H4 )5d5/2 7

/

181893.5 34 (4,

5

/ 2) or 23 ( 3 H) 4 H

4/ 12

(

1 G4)5d5/2 S

/2 182025.1 26 (4,

5

/ 2) or 33 (

X G) 2F

4/ 12

( 3 F2 )5d3/2 5

/

183573.4 24 (2,

3

/ 2 ) or 28 ( 3 F) 2 F

4/12

( 3 H4 )5ds/2 9

/

183867.6 42 (4,

5

/ 2) or 21 (

X G) 2G

4/ 12(

x l6)5d3/2 (6,3

/ 2 ) 9

/

189796.1 74 or 78 (

X I) 2G

4/ l2 (>D 2 )5d5/2 5

/2 190996.0 32 (2,

5

/ 2) or 19 (

X D) 2 D

4/ 12

( 3Po)5d3/2 (0,

3

/ 2 ) 3

/2 194442.0 64 or 21 ( 3P) 4 F

4/ 12(

1 I 6 )5ds/2 (6,s

/ 2 ) 7

/2 195440.3 91 or 91 (

X I) 2G

4/ 12( 3Pi)5d3/2 (l, 3

/2)

5

/

196705.6 77 or 58 ( 3P) 4 F

4/ 12

( 3Po)5ds/2 5 /2 200028.2 42 (0,

s

/ 2) or 47 ( 3P) 2 D

Lu VI ( 3 He) Limit 538700
NBS-114A (REV. 7-73)

U.S. DEPT. OF COMM. BIBLIOGRAPHIC DATA

SHEET

1. PUBLICATION OR REPORT NO. NSRDS-NBS 60

2. Gov’t Accession

No.

3. Recipient’s Accession No.

4. TITLE AND SUBTITLE

Atomic Energy Levels - The Rare Earth Elements

The Spectra of Lanthanum, Cerium, Praseodymium, Neodymium,

Promethium, Samarium, Europium, Gadolinium, Terbium,

Dysprosium, Holmium, Erbium, Thulium, Ytterbium, and Lutetium

5. Publication Date April 1978

6. Performing Organization Code

7. AUTHOR(S)

W. C. Martin, Romuald Zalubas, and Lucy Hagan

8. Performing Organ. Report No.

9. PERFORMING ORGANIZATION NAME AND ADDRESS

NATIONAL BUREAU OF STANDARDS

DEPARTMENT OF COMMERCE

WASHINGTON, D.C. 20234

10. Project/Task/Wotk Unit No.

11. Contract/Grant No.

12. Sponsoring Organization Name and Complete Address (Street, City, State, ZIP)

Same as No. 9

13. Type of Report & Period CoveredN/A

14. Sponsoring Agency Code

15. SUPPLEMENTARY NOTES

Library of Congress Catalog Card Number: 77-12195

16. ABSTRACT (A 200-word or less factual summary of most significant information. If document includes a significant

bibliography or literature survey, mention it here.) Energy level data are given for 66 atoms and atomic ions of the 15 elements

lanthanum (Z=57) through lutetium (Z = 71)„ These data have been critically

compiled from published and unpublished material,. Only experimentally

determined energy levels are included#) the energies being restricted to

excitations of outer- shell electrons and to inner- shell excitations up to the

soft x-ray range. The levels were taken from analyses of the spectra of atomic

gases wherever possible; however, the levels for several of the triply ionized

rare earths are from analyses of the spectra of the ions in crystals or solutions.

In addition to the level value (usually in units of cm'^) and the parity, the J

value, configuration and term assignments, and the experimental g value are

listed wherever available. Leading percentages from the calculated eigenvector

are also tabulated for each level if available. The levels are grouped into

spectroscopic terms of appropriate coupling schemes where such groups appear

meaningful. Ionization potentials are tabulated for most of the spectra.

Complete references for the tabulated data are given for each spectrum.

17. KEY WORDS (six to twelve entries; alphabetical order; capitalize only the first letter of the first key word unless a proper name; separated by semicolons)

Atomic energy levels; atomic spectroscopy; electron configurations; ionization

potentials; lanthanides; rare earths; spectra; Zeeman effect.

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