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Author’s Note on the Reprinting of

Atomic Energy Levels: Volume I, 1949; Volume II,

1952; Volume III, 1958, Circular National Bureau of Standards 467

Although twelve years have elapsed since the publication of Volume III, there is a continuing steady demand for these Volumes. The data they contain on atomic spectra cover all elements in the Periodic Table except the two groups of rare- earths: the lanthanides (Z = 58-71) and the actinides (Z = 90-?). Similar data for these spectra will be handled in a forth- coming Volume IV, now in course of preparation by W. C. Martin and his colleagues.

One of the rewarding aspects of these compilations has been the stimulation they have provided to further research on the analyses of atomic spectra. Gaps in the knowledge of spectra, and needs for investigation of additional spectra are immediately

apparent in this comprehensive compendium.

Many additional spectra have been studied and numerous extended analyses have been published that supersede the material contained in Circular 467. A bibliography in the National Bureau of Standards Special Publication 306, Sections 1

to 4 (1968—1969), provides later reference material on individual spectra. It will be some years, however, before the entire

set of Volumes will be superseded. The existing supply of these books is low. In order to meet the steady flow of requests,

it has been decided to reissue the three Volumes as part of the National Standard Reference Data System. They are reprinted

here as NSRDS-NBS 35, Volumes I, II, III. The first Volume, issued in 1952, is in great demand, and more seriously in need of extensive revision than are the

others. As new analyses appear for spectra of the lighter elements, the lists of revised energy levels, together with revised

Multiplet Tables, are being published by the National Bureau of Standards under the title “Selected Tables of Atomic Spectra,

Atomic Energy Levels and Multiplet Tables,” as Sections of NSRDS-NBS 3. Section 1 contains these data for the spectra

Sill, Si ill. Si IV; Section 2 for Sil; Section 3 for Cl, C II, Cm, C IV, C V, C vi. Similar data on the nitrogen spectra of higher ionization will be presented in Section 4. A number of other spectra are partially completed for inclusion in this Series. Wherever the individual spectra in Volume I have been revised and reported in the NSRDS-NBS 3 Series, indication

of this fact is clearly stated for each spectrum, in this reprinted issue. f Readers are urged to use the revised material for the

spectra thus marked and to take note of further revisions of selected spectra as they appear in this series.

Washington, D.C.

November 30, 1970 Charlotte E. Moore

Abstract

ATOMIC ENERGY LEVELS, VOLUME I. to 23V

This series of three volumes is a critical compilation of atomic energy levels prepared at the National Bureau of Stan- dards from the analyses of optical spectra. Volume I contains data on the spectra of hydrogen, deuterium, tritium, helium,

lithium, beryllium, boron, carbon, nitrogen, oxygen, fluorine, neon, sodium, magnesium, aluminum, silicon, phosphorus, sul- fur, chlorine, argon, potassium, calcium, scandium, titanium, and vanadium (

1 H to 23V). Volume II covers the spectra of

chromium, manganese, iron, cobalt, nickel, copper, zinc, gallium, germanium, arsenic, selenium, bromine, krypton, rubidium,

strontium, yttrium, zirconium, and niobium ( 24 Cr to 41Nb). Volume III includes the spectra of molybdenum, technetium,

ruthenium, rhodium, palladium, silver, cadmium, indium, tin, antimony, tellurium, iodine, xenon, cesium, barium, lanthanum;

hafnium, tantalum, tungsten, rhenium, osmium, iridium, platinum, gold, mercury, thallium, lead, bismuth, polonium, radon,

radium, and actinium ( 42Mo to 57 La; 72 Hf to 89Ac).

Key words: Energy levels; H-V.

f EDITORIAL NOTE: See revision note on pages 21, 24, 26, 29, 30, 31, 144, 147, 148, and 150, Volume I.

Library of Congress Catalog Card Number 75-609945
AUG 2 9 1972

i. 65 76 2

. I oo

UNITED STATES DEPARTMENT OF COMMERCE • Maurice H. Stans, Secretary

NATIONAL BUREAU OF STANDARDS • Lewis M. Branscomb, Director

ATOMIC ENERGY LEVELS

As Derived From the Analyses of Optical Spectra

Volume I

The Spectra of Hydrogen, Deuterium, Tritium, Helium,

Lithium, Beryllium, Boron, Carbon, Nitrogen, Oxygen,

Fluorine, Neon, Sodium, Magnesium, Aluminum, Silicon,

Phosphorus, Sulfur, Chlorine, Argon, Potassium, Calcium

Scandium, Titanium, and Vanadium

BY CHARLOTTE E. MOORE

NSRDS-NBS 35

Nat. Stand. Ref. Data Ser., Nat. Bur. Stand. (U.S.), 35/V.I 359 pages (Dec. 1971)

CODEN: NSRDA

Reissued December 1971

Reprint of NBS Circular 467, Volume I. See author’s note opposite title page

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

(Order by SD Catalog No. C13.48:35/V.I), Price $5

Stock Number 0303-0949
Preface

The present volume is the first of a series being prepared at the National Bureau of

Standards as part of a general program on atomic energy levels derived from observations of

optical spectra. This program can be traced back to 1924 when the Division of Physical

Sciences of the National Research Council created a Committee on Line Spectra of the Elements. The general plan was to encourage and contribute to the structural analysis of atomic

spectra and eventually to publish the results in a series of monographs. For twenty years the

lure of complex spectra gave emphasis to analysis rather than to compilation and publication

of Committee Reports.

In 1932 an extremely timely and useful book entitled “Atomic Energy States as Derived

from the Analyses of Optical Spectra” was published by Robert F. Bacher and Samuel Goudsmit.

That book set a precedent for omitting experimental details (wavelengths, intensities, Zeeman

patterns, etc.) and summarized the terms then known for 231 spectra of 69 elements. Now

structure has been recognized in more than 460 spectra, representing 83 elements, and the

earlier analyses have in almost all cases been greatly extended.

The accumulation of spectroscopic data is now too vast for publication in a reasonable

number of monographs, but the energy levels derived from them are so important for physics,

chemistry, and astronomy that a revision of “Bacher and Goudsmit” is urgently needed; it can probably be condensed into three or four volumes. In the spring of 1946 it was determined that neither Bacher nor Goudsmit contemplated such a revision, and it was decided to undertake this at the National Bureau of Standards. Details of this project were discussed at a meeting of the National Research Council Committee on Line Spectra of the Elements,

called by the Chairman, Henry Norris Russell, and held in Washington in May 1946. It was

then decided to send to interested workers in various fields a questionnaire regarding the most

useful form of presentation of the data on atomic energy levels. The present form represents

the majority vote resulting from that inquiry.

It was originally planned to issue sections in pamphlet form as the manuscript was completed, and to assemble the sections into volumes of about 400 pages each. Section 1 has

been published separately.

This volume comprises the first three sections of Circular 467 of the National Bureau of

Standards as follows:

Section 1. The Spectra of Hydrogen, Deuterium, Tritium, Helium, Lithium, Beryllium,

Boron, Carbon, Nitrogen, Oxygen, and Fluorine. (Pages 1 to 75.)

Section 2. The Spectra of Neon, Sodium, Magnesium, Aluminum, Silicon, Phosphorus,

Sulfur, and Chlorine. (Pages 76 to 210.)

Section 3. The Spectra of Argon, Potassium, Calcium, Scandium, Titanium, and Vanadium.

(Pages 211 to 309.) It has since been decided not to publish sections 2 and 3 separately because they are simultaneously in press and complete Volume I. The manuscript has been prepared by Charlotte E. Moore under the direction of

William F. Meggers, Chief of the Spectroscopy Section of the Atomic and Molecular Physics

Division. Sincere appreciation is hereby expressed for the cordial cooperation of the National

Research Council Committee on Line Spectra of the Elements, and for the heretofore unpublished contributions of many spectroscopists. Because the current volumes of Atomic Energy

Levels disclose many gaps in our knowledge in addition to some uncertainties and occasional irregularities, it seems certain that they will inspire further researches in experimental and theoretical

spectroscopy, and thus in turn advance the specialized subjects of atomic and nuclear physics.

E. U. Condon, Director.

Washington, D. C., June 1948.

n
Contents

0/

Page

Preface 11

1. Introduction vn

2. Scope of the Present Tables vn

3. Nomenclature (atomic energy levels, spectroscopic terms, multiplets) vm

4. Arrangement vm

4.1. Headings, remarks vm

4.2. References ix

4.3. Reference symbols ix

5. Spectroscopic Notation. _ ix

5.1. Series spectra x

5.2. Inert gases xi

5.3. Complex spectra xii

6. Columns of the Table xn

6.1. Author xn

6.2. Configuration xn

6.3. Designation xii

6.4. Inner quantum number J xm

6.5. Atomic energy level xm

6.6. Interval ^ xm

6.7. Observed gr-value (tables 1 to 4, Lande

^-values) xiv

7. Tables of Predicted and Observed Arrays of

Terms xv

7.1. Shells xv

7.2. Arrays of predicted terms of the se- quences Be i through Nei (tables 5

to 11) xv

Page

7. Tables of Predicted and Observed Arrays of

Terms—Continued

7.3. Arrays of predicted terms of the se- quences Mgi through Ai (tables 12

to 18) xvi

7.4. Arrays of predicted levels of the Nei

and Ai sequences (tables 11 and 18)__ xvi

7.5. Arrays of predicted terms of the se- quences Cai through Vi (tables 19

to 22) xvi

8. The Periodic Table xvn

8.1. The chemical elements by atomic number, ionization potentials (table 23) __ xvn

8.2. The chemical elements by chemical

symbol (table 24) xvii

8.3. The periodic system (table 25) xvn

8.4. Index—isoelectronic sequences (table

26) xvn

9. Future Investigations xvn

9.1. Need for further analysis xvn

9.2. Term intervals xvm

9.3. Series spectra—Rydberg denominators, xvm

9.4. Observed Zeeman patterns xvm

9.5. Energy or Grotrian diagrams xvm

10.

Acknowledgments xix

List of Tables

Table Subject Page Table Subject Page

1 to 4 Land6 0-values XX to XXVII

predicted terms—continued

PREDICTED TERMS

16 S i XXXIV

5 Be i XXVIII 17 Cl i XXXIV

6 B i XXVIII 18 A i XXXV

7 C i XXIX 19 Cai XXXV

8 N i XXIX

20 Sc i XXXVI

9

10 0 i XXX

21 Ti i XXXVII

F i XXXI

11 Ne i XXXI 22 V i XXXVIII

12 Mg i XXXII 23 Ionization Potentials XL

13 Al i XXXII 24 Chemical Symbols XLI

14 Si i XXXIII 25 The Periodic System XLII

15 P i XXXIII 26 Index—Isoelectronic Sequences XLIII

in
Index to Spectra

Element z Spectrum Page Element z Spectrum Page

Hydrogen 1 H 1 Neon 10 Ne i 76 D 3 Ne ii 81 T 3 Ne in _ ... 83

Ne iv ___ 84

Helium 2 He i 4 Ne v_ .. .... 86

He ii 6 Ne vi ___ 88

Lithium 3 Li i_ 8 Sodium 11 Na i_ 89

Li ii 10 Na ii ___ 91

Li in 11 Na in__- 93

Na iv.. 95

Beryllium 4 Be i 12 Na

v 96

Be ii . 14 Na vi

_ 98

Be hi

_ 14 Na vii 100

Be iv __ 15 Na viii 103

Na ix

_

_

_ 105

Boron 5 B i 16 B ii 17 Magnesium 12 Mg i_ . 106 B in _ _ _ _ 19 Mg ii ___ 108 B iv 19 Mg hi ___ 109 B v 20 Mg iv ___ 111

Mg v_ 113

Carbon 6 C i 21 Mg vi ___ 114 C ii 24 Mg vii _ ___ 117 C hi 26 Mg viii ___ 119 C iv __ 29 Mg ix ___ 121 C v 30 Mg x ___ 122 C vi 31 Mg xi ___ 123

Nitrogen 7 N i 32 Aluminum 13 A1 i 124 N ii 35 A] ii _ 126 N hi 38 1 A1 hi ___ 129 N iv 40 A1 iv ___ 130 N v 42 A1 v ___ 131 N vi 43 A1 vi ___ 133 N vn 44 A1 vii__ 135

A1 viii ___ 136

Oxygen 8 0 i 45 A1 ix ___ 138 0 ii 47 A1 x _ _ ___ 140 0 in 50 A1 xi ___ 142 0 IV 53 A1 xii ... ___ 143 0 v _ _ __ 0 vi ------ 56

58 Silicon 14 Si i- ___ 144 0 vii _ _ . 59 Si ii _ ___ 147 0 viii 59 Si hi ___ 148

Si iv_- 150

Fluorine 9 Fi 60 Si

v ___ 151 F ii 62 Si vi_ - _ ___ 152 F hi 64 Si vii ___ 154 F iv 66 Si viii ___ 156 F v 69 Si ix. __ ___ 157 F vi _ 71 Si x ___ 159 F vn 74 Si xi __ ___ 160 F viii 75 Si xii _ ___ 162

IV
Index to Spectra

—Continued

v

Element Z Spectrum Page

Phosphorus 15 P i 163 P ii 164 P hi 166 P iv 168 P v 169 P vi 170 P vn 171 P viii 173 P ix 174 P x 176 P xi 177 P xn 179 P xm 180

Sulfur 16 S i 181 S ii 183 S hi 185 S iv 187 S v 188 S vi 189 S vn 190 S viii 191 S ix 193 S x 194 S xn 194

Chlorine 17 Cl i 195

Cl ii 197

Cl hi 199

Cl iv 201

Cl

v 202

Cl vi 204

Cl vn 205

Cl viii 206

Cl ix 207

Cl

x 209

Cl xi 210

Argon 18 Ai 211 A ii 216 A hi 218 A iv 220 A v 222 A vi 223 A vn 224 A vm 224 A ix 225 A x 226 A xi 226 A xiv 226

Potassium 19 K i 227 K ii 230 K hi 231 K iv 233 K v 234 K vi 236 K vn 237 K viii 238

Element Z Spectrum Page

Potassium

— 19 K ix 239

(Continued) K x 239 K xi 241

Calcium 20 Ca i 242

Ca ii 245

Ca hi 247

Ca iv 248

Ca

v 249

Ca vi 251

Ca vn 252

Ca viii 253

Ca ix 254

Ca

x 255

Ca xi 255

Ca xn 257

Ca xm 258

Ca xv 258

Scandium 21 Sc i 259

Sc ii 262

Sc hi 263

Sc iv 264

Sc

v 265

Sc vi 266

Sc vn 267

Sc viii 268

Sc ix 269

Scx 270

Sc xi 271

Sc xn 272

Titanium 22 Ti i 273

Ti ii 279

Ti hi 281

Ti iv 283

Ti

v 284

Ti vi 285

Ti vii 286

Ti viii 287

Ti ix 288

Tix 288

Ti xi 289

Ti xn 289

Ti xiii 290

Vanadium 23

V i 291 V ii 298 V in 301 V iv 303 V v 304 V vi 304 V vn 305 V viii 306 V ix 306 V xi 307 V xii 307 V xm 308 V xiv 309
'
1. Introduction

Since the publication in 1932 by Bacher and Goudsmit

of their book “Atomic Energy States/’ 1 the number of

energy levels determined from the analyses of optical

spectra has increased by a factor of perhaps 4 or 5 and

yet no critical compendium of these data exists. In order

to meet this need, the present compilation has been undertaken at the National Bureau of Standards.

A handbook of “Atomic Energy Levels” is an indispensable tool for workers in many fields of science today.

For the spectroscopist it reveals the gaps in our knowledge of atomic spectra—both those spectra that are incompletely analyzed because of insufficient observations

and those that have not yet been observed. For the theoretical as well as the experimental investigators, the detailed comparison of data on related spectra, uniformly

arranged, is a useful guide in the study of series, intervals,

electron configurations, and many other related problems

of atomic structure.

Many interesting spectroscopic problems also arise in

connection with microwave spectroscopy, with ultraviolet

solar spectra observed from rockets, with infrared spectra

observed with a sensitive detector, and in general with

types of observation that have developed comparatively

recently. If the analysis of a spectrum is complete the

positions of the lines can be calculated from the known

energy levels, including in many cases those of lines in the

far infrared or ultraviolet. The present term tables are now being used in connection with some problems of this

sort.The needs of the nuclear as well as the atomic physicist,

of the chemist interested in atomic structure, of the as- trophysicist interested in the study of stellar structure

and cosmical abundances, and of those in many other

fields of science all provide the inspiration for this

work.

2. Scope of the Present Tables

Ten of the fourteen members of the National Research

Council Committee on Line Spectra of the Elements at- tended the meeting held in Washington in May 1946, to consider details of this program. Two members who

were unable to attend, I. S. Bowen and R. A. Sawyer,

made personal visits to the Bureau before the meeting for

this purpose. A number of other spectroscopists, including B. Edlen, have also been consulted in private

conference.

On the recommendation of the committee a questionnaire regarding details of arrangement of the tables was

sent to 94 interested workers in various fields of science.

Sixty-one replied to this inquiry. The scope, uses, and

format of the book have been discussed at length and the

general form adopted is a direct outgrowth of these conferences and recommendations.

The cordial collaboration of those who have been contacted is gratifying. The Chairman of the Committee,

H. N. Russell, has read all of the manuscript, provided

much material, and made many helpful suggestions. The

writer has had the benefit of his broad experience with

spectroscopic problems. The committee and others as well are giving their wholehearted support to this

program.

Requests to extend the scope of the tables have been

seriously considered. It was finally decided to include

only the energy levels derived from observations of atomic

spectra, exclusive of hyperfine structure ascribed to atomic nuclei (with the exception of H, D). With full

i McGraw-Hill Book Co., Inc., New York, N. Y., and London (1932).

appreciation of the importance of critical data on nuclear

and X-ray spectra, on isotopes, and on other subjects

related to atomic structure the present policy was adopted

for several reasons. The usefulness of the tables might

well be vitiated by the inclusion of too many kinds of

data. The critical editing of the enormous amount of

literature entailed by extending the program would of

necessity delay by years the publication of data on any

one phase of the subject. Finally, the preparation of the

volumes of “Atomic Energy Levels” is an appropriate

sequel to the work on the revised edition of “A Multiplet

Table of Astrophysical Interest,” 2 hereinafter referred to

as RMT. 3 These two types of tables used in conjunction

with each other provide a condensed and unified picture

of many atomic spectra—the one containing the energy

levels and term designations used to compile the multiplets

and excitation potentials recorded in the other.

In view of the limitations imposed here, reference is made under the relevant spectra to the excellent sum- mary and bibliography of data on hyperfine structure by

Meggers, in his paper entitled “Spectroscopy, Past,

Present, and Future.” 4 In addition, selected later papers on hyperfine structure and isotope shifts are listed for

certain spectra. The reader is warned, however, that the

individual references on these subjects included here are highly selected and that the present book is inadequate

for workers in these fields.

2 Princeton Univ. Obs. Contr. No. 20 (1945).

3 This edition is limited to lines of wavelength longer than 3000 A. Along with the

tabulation of energy levels, the writer is also preparing an ultraviolet extension to the Revised Multiplet Table.

* J. Opt. Soc. Am. 36, 431 (1946).

VII
VIII

3. Nomenclature

(Atomic Energy Levels, Spectroscopic Terms, Multiplets)

Briefly summarized, the atoms of a gas or vapor, when

excited by radiation, absorb certain wavelengths corre- sponding to transitions of their outer electrons from lower

energy levels to higher ones. When the transitions are from higher to lower energy levels the lines are emitted.

Each chemical element can emit as many atomic spectra

as it has electrons. If, for example, a sample of pure

vanadium is placed in an electric arc and light from the

arc is observed through a spectroscope, a complex array

of spectral lines of various intensities appears. Most of

these lines are produced by neutral vanadium atoms and

are characteristic of the first (or arc) spectrum of vanadium, Vi.

If vanadium atoms are excited by an electric spark instead of an arc the higher energy of the spark will cause a large proportion of them to lose an electron. The atoms

with one less electron in turn exhibit their own characteristic array of spectral lines, i. e., the second spectrum of

vanadium, Vn. Similarly, with suitable sources of excitation, spectra of higher ionization can be observed cor- responding to the loss of 2, 3, etc., electrons, the total

number possible being equal to the atomic number of the

element in question, in the case of vanadium, 23. To

date, however, nothing is known about the vanadium

spectra beyond Vxiv. The present volume contains the

energy levels of all atomic and ionic spectra in which

structure has been recognized, for the 23 chemical ele- ments hydrogen throngh vanadium, H, Hei, Hen, Lii,

. . . Vxiv, and includes 206 spectra.

The wavelengths, or positions of the lines observed in a given spectrum are carefully measured, and estimated

intensities of the fines recorded. The wavelengths are then converted into wave numbers in vacuo from standard

tables.5 By studying differences among the wave numbers

of the observed fines the energy levels can be found, since

each spectral fine is produced by a transition between two

such levels. From a careful study of groups of fines that

have similar characteristics, such as intensity behavior

when produced at different temperatures in the laboratory, the levels involved in the production of the lines are grouped to form spectroscopic terms. The terms result

from definite configurations and motions of the outer

electrons of the atom and are explained by a well-established theory of spectral structure.

6

For any given elec- tron configuration the array of terms to be expected in a

given spectrum can be predicted from the quantum

theory. Conversely, the energy levels and the terms

formed from them furnish fundamental information,

based on observation, concerning the outer electrons of

the atom. The energy levels are, therefore, important

constants of nature.

A group of related fines produced by transitions between

two complex terms was first called a multiplet by M. A.

Catal&n in 1922.7 The Multiplet Tables mentioned

above (RMT, sec. 2) give the observed wavelengths of

the fines that form the leading multiplets of many different

spectra.

4. Arrangement

An attempt has been made to follow the general plan

adopted by Bacher and Goudsmit in 1932, but some major

changes have been introduced. In the present work the

elements are arranged in order of increasing atomic number rather than in the alphabetical order of their chemical

symbols. The tables on pages xl and xli should facilitate cross reference to the earlier book. For a given element the

arc spectrum is followed by the successive spark spectra

in order of increasing stage of ionization, as was done

previously. Gaps occurring in the run of spark spectra

for a given element indicate that structure has not yet

been recognized in the missing spectrum.

Contrary to the earlier arrangement, in the present compilation the energy levels of all spectra are fisted upward

from the ground state zero. Absolute values are not

given, but can be found for series spectra by consulting

the references to the analysis or by subtracting the tabulated values from the limit quoted for a given spectrum.

4.1. Headings, Remarks

For each spectrum descriptive remarks which are self- explanatory, are preceded by headings as follows: Those on the left give (1) the number of electrons in the atom,

and, except for arc spectra, the isoelectronic sequence to which the spectrum belongs (see sec. 8.4) ; (2) the ground

state of the atom with its complete electron configuration;

(3) the absolute value of the ground level in cm-1

, i. e., the limit referred to the ground state of the ion of next

higher ionization. The headings on the right give (1) the

atomic number Z and (2) the ionization potential in

electron volts obtained by multiplying the limit quoted

* H. Kayser, Tabelle der Schwingungszahlen, Revised Edition (Edwards Brothers,

Inc., Ann Arbor, Mich., 1944).

6 F. Hund, Linienspektren und Periodisches System der Elemente (Julius Springer, Berlin, 1927).

7 Phil. Trans. Boy. Soc. London (A) 223„ 127 (1922); Rev. Acad. Madrid 25, 20 (1922).
IX on the left by the factor 0.00012395, which was recom- mended by Birge in 1941.8 9 In the remarks the word “author” refers to the investigator who has worked on the analysis of the spectrum, in

contrast to the word “writer,” which applies to the

present compiler of these data.

4.2. References

In 1914 W. F. Meggers started a card catalog of all literature references on the description and analysis of

atomic spectra, which has been carefully kept up to date

and is doubtless the most complete of its kind in existence

today. This catalog, together with the valuable and ex- tensive collection of spectroscopic reprints of Meggers

and Kiess, furnish the basic material requisite to the

present program.

Following the descriptive remarks, literature references are given for each spectrum. It is not the purpose of

this book to list all references to the analysis of each

spectrum. The writer has attempted to make a careful

appraisal of the literature and to list all the references

needed to cover the complete analysis, including, of course, those used in the present work, and those giving the

classified lines, energy or Grotrian diagrams, and observed

^-values. A few selected references to hyperfine structure

and isotope shift are also included, as mentioned in sec. 2. In many spectra important regularities have been found

by an author whose name does not appear in the references

quoted here. This occurs when later and more complete

papers include the earlier results and references. For

example, Bowen and Millikan first discussed a number of

the spectra described in Edlen’s Monograph,10 but only

the later reference is fisted. Full recognition should be

given to all such contributors in spite of the arbitrary

limitations imposed here.

4.3 Reference Symbols

Most of the literature references are followed by letters

in parentheses, which describe the scope and content of

the paper, as follows:

I P Ionization potential.

T Terms.

C L Classified lines. G D Grotrian diagram.

E D Energy diagram.

Z E Zeeman effect. I S Isotope shift. hfs Hyperfine structure. Several of these topics are frequently discussed in one

paper, in which case all the symbols that are applicable are mentioned with the reference. If, for example, the

symbols (IP) (T) (C L) follow a reference, it signifies

that the paper gives an ionization potential, terms, and

classified lines. In a few selected cases, self-explanatory descriptions

follow the reference, as, for example, in C i “(Solar data).”

Some papers are described in abstracts or letters to the

editor in the Physical Review. These are indicated by

(A) or (L) preceding the date in the reference, as is cus- tomary, but they should not be confused with the above

symbols.

References for which no symbol is given are described

in the remarks on the spectrum. Many of these are

theoretical in character, as for example, the one to Racah’s

paper (see Ne i) which deals with ^-coupling in the spectra

of the Nei type (sec. 5.2). Symbols have been omitted

in general from references- that are specialized in character

as compared with those that can be more concisely described by the array of letters given above.

5. Spectroscopic Notation

Some details of spectrum analysis should perhaps be

mentioned in order to explain the plan of presentation of

spectroscopic data adopted here. According to the

quantum theory each energy level is defined by an inner

quantum number commonly known as J. The terms

(groups of related levels) have multiplicities which are all odd (1, 3, 5, 7, . . .) or all even (2, 4, 6, 8, . . .) in a given

spectrum. For terms of odd multiplicity the J-values

are always integers, 0, 1, 2, 3, . . .; for those of even

multiplicity the J-values are odd multiples of the fraction

H, denoted as 1 2 % 3 K, etc. Terms are further de1 Rev. Mod. Phys. 13, No. 4, 233 (1941).

• The discrepancies between the ionization potentials in this book and those given by

the writer in the RMT are, in general, due to the use of the older factor, 0.00012345, in

calculating data for the Multiplet Tables.

10 Nova Acta Reg. Soc. Sci. Uppsala (IV) t. No. 6 (1934).

fined by azimuthal quantum numbers L that have for

terms labeled S, P, D, F, G, H, I, K, etc., the values 0,

1, 2, 3, 4, 5, 6, 7, etc., respectively.

A term of a given kind and multiplicity consists of a

definite number of energy levels whose inner quantum

numbers are stipulated by the quantum theory. For ex- ample, an “S” term of multiplicity three has only one

level with J-value equal to 1. This term is designated as

8Si. A “D” term of multiplicity four consists of four

levels whose J-values are 3 %, 2K, 1% % respectively,

designated as

4D3 ^,4D2 ^,4Di^, 4D^. Tables giving the

J-values of terms of each multiplicity are discussed in

sec. 6.7. The designation is further described by two other quantities discussed in sec. 5.1 and sec. 5.3: (1) a prefix that
X

serves to distinguish terms of the same type and multiplicity from each other and which, for simpler spectra,

gives information about the electron configuration, and

(2) a superscript “°” denoting that a term belongs to the

odd set (sec. 5.1). The complete multiplet designation of

any spectral line includes all of these quantities: multiplicity, azimuthal quantum number, and inner quantum

numbers for both the lower and higher energy levels

involved in the production of the line. The lines normally observed in a spectrum, i. e., the

permitted lines, do not result from differences among the

levels of each term and every other term, but from dif- ferences (called combinations) between two sets of terms, one “even” and one “odd.” Permitted lines are further

restricted by the rules governing the e/-values. Only

those J-value combinations between even and odd terms

for which J changes by 0 or ±1 are permitted, and nor- mally no combinations occur between levels with J=0- Under special conditions “Forbidden” lines are observed,

in which case these selection rules for odd and even terms

and for t/-values do not hold.

A relatively limited number of terms can thus account

for a complex array of spectral lines. It is obviously desirable to describe these terms by a uniform notation that

defines the quantum properties as completely as possible,

and is also adaptable to all the varieties of spectra that

have been and are likely to be observed.

A general scheme of notation was outlined in 1929,11 which has been widely used. This scheme has been interpreted so freely by various investigators that a serious

lack of uniformity has resulted in the literature. When

this question arose in connection with the RMT the writer

did not anticipate the present project, which is far wider

in scope. She did, however, attempt to introduce uniformity and, in order to avoid further confusion, she has

adopted here the notation of the RMT with only slight

modifications. It is admittedly far from ideal, but is perhaps justifiable if it serves only to stimulate serious

consideration of the question and the general adoption of a more satisfactory scheme.

The “Designation” (sec. 6.3) adopted for the less complex spectra that exhibit conspicuous series differs from

that used for the more complex spectra that do not.

5.1. Series Spectra

For many elements the spectra become more complex

as the degree of ionization decreases. The terms of each

spark spectrum are the parent terms or “limits” of the

series of terms in the spectrum of next lower degree of

ionization. The term arrays resulting from the addition

of s, p, d, f, etc., electrons to each limit are well known

from theory (sec. 7). Consequently, for the simpler

spectra the electron configurations of the observed terms

can be assigned without ambiguity by a study of the

limits in the spectrum of next higher degree of ionization.

The spectrum of Ovi may be used as an illustration.

Here the lowest term of Ovu, ls21S, is so much lower

than any other that no other limit need be considered.

The addition of a “running” s, p, d,j, etc., electron to this state produces a series of doublet S, P°, D, F°, etc., terms

in Ovi. In this case the electrons and terms are of the

same type. The ground term of Ovi is ls2

(

1 S)2s 2S, the

next term is ls2

(

1S)2p 2P°, etc., where (

J S) signifies the

parent term or limit in Ovii. The “Designations”

adopted for these terms are 2s 2S, 2p 2P°, etc. 12 The

number “2” in the prefix 2s, etc., denotes the total quantum number, which depends on the shell occupied by the

outer electrons giving rise to the term (see sec. 7). This

number increases by unity for the series terms of a given

type, as for example, for the series 2s 2S, 3s 2S, 4s 2S, etc. An additional electron is effective in the production of

the spectrum of Ov. The configuration Is2 2s2 gives the

ground term J S, designated here as 2s2 XS; and Is2 2p

2 gives the terms 2p

2 3 P, 2p

2 a D and 2p

2 X S. The spectrum

of Ov is more complex because, in addition, there are two

low terms in Ovi, both of which are important parent

terms or “limits” giving rise to terms in Ov. The addition of running electrons to these limits gives, among

others, the following theoretical or predicted array of

terms:

Ovi Ov

Config. Limit Added

Electron Config. Terms

Is2 2s 2 S 3s Is2 2s(2 S)3s PS vs

ft tt 2V Is2 2s(2S)2p

{

^3

o

o

tt tt 3d Is2 2s(2 S)3d

{

3 D

iD

Is2 2p

2po 3s Is2 2p(2 P°)3s

{

o

o

tt tt 3P Is2 2p(2 P°)3p PSvs

3 P

ip

3 D

iD

tt r r 3d Is2 2p(2 P°)3d

{

o

£hPh o

3 D°

1 D°

O

O

Terms are “odd” (denoted by the superscript “°”) when

the configuration contains an odd number of p, /,

h, etc. electrons, 3P°, for example. In the case of

Ov, since one limit is even and the other one odd, no

ambiguity occurs if a designation consisting of the running

electron and term is used for terms from both limits, i. e., for terms from 2S in Ovi, 3s 3 S, 3s X S, 2p 3 P°, 2p 1 P°,

12 In the RMT the notation 2

2 S, 22P°, etc. was used for series of this kind when the n H. N. Russell, A. G. Shenstone, and L. A. Turner, Pbys. Rev. 33, 900 (1929). term and running electron were of the same type.
XI

3d 3D, 3cUD; and for terms from 2P° in Ovi, 3s 3P°, I 3s T0

, 3jp

3 S, 3p

3P, . . . 3d 1F°. This notation has been

adopted for those spectra that have two low limits, one even and one odd.

When two or more of the effective limits are all even

or all odd, an addition to this notation is required.' The

limit terms are always listed in the term arrays (sec. 7)

from lowest to highest, i. e., according to increasing value

of the terms, starting from zero. In Ov the ground term

is 2S and the next higher is 2P°. Consequently, 2S is list- ed first in the above array and in the one on page 57. For terms from the lowest of a group of limits the running

electron is used as described above. For those from the

next higher or second limit a prime is affixed to the running

electron, for those from the third limit a double prime,

etc. The use of primes is well illustrated by the term ar- rays: (1) of Oiv, p. 55, where the lowest limit is even and

the next odd, in which case primes are first introduced for

the third limit; and (2) that of On, p. 50, where the

primes are used for the second limit, since the two lowest

limits are even. With the exception of the spectra of the inert gas type

(sec. 5.2), the notation giving the running electron with

primes affixed as described above has been used for the

spectra of all isoelectronic sequences through K and for

the spectrum of Cai. The rest of the Cai sequence and

the Sc i, Ti i, and V i sequences have the notation adopted

for complex spectra (secs. 5.3 and 7.5).

5.2. Inert Gases

The first spectra of the inert gases form a special class

of series spectra that must be discussed separately. In

these neutral atoms the last electron required to close the

different shells is added. Terms are not definitely distinguishable for many types of higher series members owing to the departure from ZS'-coupling, and the J-values

of the components of the limit term must be indicated.

A detailed account of the theory of the couplings of vari- ous types will not be attempted here. Briefly summarized,

when Z&'-coupling does not hold, jl- or ^-coupling be- comes important, the Lande (/-values (tables 1 to 4), (sec.

6.7) do not hold, and levels are grouped by pairs rather

than by terms. For further details, special treatises on

the subject should be consulted.13 The present volume contains two sequences of this type:

Ne i and A i. In these spectra the last of the six p-electrons is added and completes these shells.

13 E. Back and A. LandS, Zeemaneffektund Mvltiplettstruktur der SpektraUinien, (Julius Springer, Berlin, 1925). F. Hund, Linienspektren und Periodisches System der Elemente (Julius Springer,

Berlin, 1927). R. F. Baeher and S. Goudsmit, Atomic Energy States (McGraw-Hill Book Co.,

Inc., New York, N. Y. and London, 1932). H. E. White, Introduction to Atomic Spectra (McGraw-Hill Book Co., Inc., New

York, N. Y., and London, 1934). E. U. Condon and G. H. Shortley, The Theory of Atomic Spectra (The Macmillan

Co., New York, N. Y.; The University Press, Cambridge, Eng., 1935).

I As stated in the remarks for Nei, Edlen suggested that

a pair-coupling notation be adopted for Nei-like spectra

to take into account the departure from ZS'-coupling.

The j/-coupling notation in the general form suggested by

Kacah 14 has, consequently, been adopted, on Shortley’s

suggestion. Shortley has also prepared a detailed array

of the theoretical arrangement of the pairs, for the writer

to use as a guide in preparing the tables of spectra of

this type.

A few general remarks will suffice to explain the general

plan of presentation. All levels from a given configuration are in one group. The groups are listed in order of

increasing value of the smallest level in each group.

Within a group the levels are paired and the pairs form

two subgroups, each of which has as a limit one of the

two components of a

2P° term, 2Pi^ and 2P^, the former

being the lower. Within the subgroup members of a pair are listed together in order of increasing value of the lower

member, unless they are widely separated numerically, in

which case the lower pairs precede the higher member of

the wide pair. Each pair consists of two levels whose

J-values are known from theory, and differ by only one

unit. The designation of the pair gives the running elec- tron, followed by the mean value of the two quantum

numbers given in brackets. As usual, a prime is used

with the running electron to indicate the higher limit.

The spectrum of Nei may be used as an illustration.

The pairs from the 3s-configuration form one group. The

next group in order of increasing numerical value of the

lowest member is 3p, the next is 4s, etc. Within the 3s

group one pair having J=2, 1, respectively, has the limit

(

2PiH) in Nen, and is designated as 3s[l^]°, where the “°” has the usual meaning. The second pair in the 3s

group has the higher limit (

2P^) in Ne n and J-values 0

and 1, respectively. The designation is, therefore, 3s'[K]°.

In the group having the 3p-configuration the components

of pair 1, 0 are widely separated, 148259 and 150919, re- spectively. They are listed separately in numerical order

within the subgroup having the limit (

2Pi H), each member being labeled 3_p[Kl- Then follows the related subgroup 3^'[1^], etc., with the pairs fisted in increasing

order.

The spectra to which the pair-coupling applies are

fisted under the Nei and Ai isoelectronic sequences in table 26.

For convenience of cross reference to Baeher and

Goudsmit’s book and to other publications, the Paschen

notation for these spectra has been retained in column 1. Unfortunately, the jZ-coupling notation was not used in

the RMT, but it is hoped that the style adopted there can be translated into the present form by means of the

table on page xvn of that Contribution. 15

Phys. Rev. 61, 537 (L) (1942).

is A Mvltiplet Table of Astrophysical Interest, Princeton Univ. Obs. Contr. No. 20

(1945).
XII

5.3. Complex spectra

In the majority of complex spectra the terms are so numerous that it is impracticable to designate them by

their configurations. For these spectra the prefixes, a,

b, c, d are assigned to the low terms of each type (even or odd) and z, y, x, etc., to those that combine with them

(odd or even). The high terms of the same type as the

low ones start with the prefix e and continue through/,

g, etc.

This notation for complex spectra is first used for Sc n

in the present volume. It is also used for all subsequent

spectra of the Cai sequence and for the spectra of the

Sc i, Ti i, and V i sequences. These spectra are discussed further in sec. 7.5. In many complex spectra it is impossible to group all known levels into spectroscopic terms. Miscellaneous

levels are assigned numbers, and the superscript “ ° ” if they belong to the odd set.

6. Columns of the Table

The data on atomic energy levels are presented in a maximum number of seven columns in the tables. These

columns may be described as follows, although the numbers on the left serve only as a guide to the order of

presentation, since all are not needed for every spectrum.

Column Description Tabular Entry

1 Author Edl6n, Paschen, Author

2 Configuration Config.

3 Designation Desig. 4 Inner Quantum Number J

5 Atomic Energy Level Level

6 Interval Interval 7 Observed 0-value Obs. g

6.1. Author

Column one gives the notation used in individual papers on the analysis of certain spectra. For many spectra

discussed by Edl6n, i. e., mostly spectra of the light ele- ments, the heading “Edl6n” is used to indicate his notation.

As stated above, the heading “Paschen” is given for

spectra of the inert gas type, meaning that the column

contains Paschen’s notation.

Frequently “Author” or “Authors” and, occasionally,

initials are used as a heading. This is explained in the

remarks and references for the spectrum in question.

This column is used only when necessary to enable the

reader to translate the notation in the literature into that

adopted in the “Designation” column for the sake of uniformity. It is omitted for the simpler spectra and for

those in which no ambiguity can occur in the interpretation of the individual papers on analysis.

6.2. Configuration

Column two gives the electron configuration. For the

simpler spectra, where only one limit term is involved, the

limit is not repeated in the configuration for each term.

Similarly, the electrons in closed shells are given only

when necessary. For example, in Li i, p. 9, all terms

have the limit (*S) in Li n, and two electrons form the

closed Is shell. The complete configuration of the ground

term 2s 2S is ls2 (

1 S)2s, here called 2s for brevity. Similarly, for the next term, 2p 2P°, it is ls2

(

1 S)2^, called 2p,

etc. For each spectrum, any electrons not mentioned in

the configuration column may be found in the heading

giving the ground state. In more complex spectra, all electrons and limits needed

to explain the terms are given, the limit terms being in

parentheses, as usual. In C ii, p. 24, for example, the

term at 116537.88 has the limit (*S) in C in, as indicated

by the configuration 2s?

(

1 S)3s. The rules governing the use of primes for terms from different limits have been

described in detail in sec. 5.1. The J-value indicating the component of the limit term

responsible for certain terms or levels is of considerable

theoretical interest. Many papers discuss this question.

No attempt has been made to list here the J-values

for the limit terms except in the case of inert gas spectra

(sec. 5.2).

6.3. Designation

The designation column has been explained in sec. 5. Spectra have been divided into three classes and a uniform designation adopted for each class. For series

spectra, the running electron without or with primes is giten as a prefix to the term. For inert gas spectra the

^-coupling notation of the related pairs of levels is used.

For complex spectra the prefixes a, b, ... e, j; z, y, x,

. . . are given.

Miscellaneous levels are assigned numbers and odd

levels are indicated throughout by the symbol “ °.”

Other miscellaneous designations, which are usually

self-explanatory, are also used. In F i, p. 60, for ex- ample, the type of notation adopted by Edl6n for miscellaneous levels from the 3d and 4d configurations, 3d X2 , etc., has been retained. Edl6n remarks that it is impos-
XIII

sible to assign term designations to these levels because of

the departure from Z*S-coupling.

6.4. Inner Quantum Number J

This column gives the inner quantum number J for

each level when known, or the quantum numbers of all components of a term if the term is unresolved into its component levels. For brevity the end quantum numbers

of a term are frequently given for unresolved terms. For

example, the term of F n, p. 63, at 264610 is an unresolved 5F term. A

5F term consists of 5 components with

J-values of 5, 4, 3, 2, 1, respectively. They are denoted

as “5 to 1 ”

in the column headed J. The J-values

for terms of the various types, S, P, D, etc., and multiplicities are given in tables 1 and 2. A blank in this

column indicates that the author has not defined the

J-value. In sec. 6, following, J-values are discussed

further.

As a rule, J-values can be determined from the observed

combinations. In the spectra of Ne i and A i, however,

Shortley has suggested that special care be taken to indicate those that are verified by observation in the case of

levels produced by /-electrons, since some pairs overlap

and some are unresolved. As an aid in the theoretical

interpretation of these spectra, the J-values that are derived from the observed combinations involving/-electrons

are entered in italics in the tables.

6.5.

Atomic Energy Level

This column gives the atomic energy levels of the individual spectra, odd levels being in italics throughout.

With the exception of H-like spectra they are, in general,

observed values.16 In a number of spectra extrapolated

values estimated from isoelectronic sequence data are also

included to supplement incomplete observational results. Brackets are used to denote extrapolated values.

For every spectrum the levels are fisted from the ground

state zero, i. e., absolute values are not given in these tables.

The levels are grouped by terms, or by pairs in the case

of the inert gas spectra (sec. 5.2). The terms are fisted

in order of increasing numerical value of the smallest

level in each. Miscellaneous levels are given in proper

numerical order between terms. For unresolved levels

the effective mean value of the components is given.

For terms in which only certain components have been

observed, those levels that are known are fisted with the

known J'-value, and blanks occur in the table opposite the

J-values of the missing members.

The value of the limit referred to the ground state oj

the atom oj next higher stage oj ionization, i. e., the limit

u For spectra of the H sequence the values calculated hy J. E. Mack from the series formula are given, as is explained in the remarks.

giving the 'principal ionization potential, is entered in bold

face in the table. In spectra having terms with negative

absolute values, the limit appears in the correct numerical

place in the table and is followed by higher terms. More

often, it appears at the end of the table, following a row

of leaders which indicate that many high terms have not

yet been found. The value of the limit given in the

heading is repeated in the table, throughout. Two limits are given for Nei- and Ai-like spectra, when the absolute values of both components of the limit term 2P?H> ^

are known, the lower limit being in bold-face type (see

sec. 5.2).

The selection of the numerical value of the limit adopted

here is frequently arbitrary, and those who are seriously

interested in the best value should consult the references.

The length and type of the series, the series formula used,

the type of extrapolation, and many other factors affect

the accuracy of the limit. The remarks contain relevant

details regarding the evaluation of the limit. Higher limits,

if any, can be calculated by the addition of the appropriate term values of the succeeding spectrum to the limit

quoted here.

In many spectra no intersystem combinations connecting the terms of different multiplicity within a spectrum,

have been observed. For these spectra a constant cor- rection, x, which may be either positive or negative, must,

therefore, be applied to the terms of one multiplicity, and

a different constant y to those of another in spectra where

terms of three multiplicities have been detected, in order

to put all terms on the same scale. In the tables the

entries and “+2/” follow the levels of all such sets of terms.

If long series have been observed the relative positions

of the terms of different multiplicity can be determined

accurately from the series limits, and the correction x is small.17 In many cases series are short or lacking and the

error may be considerable. Estimated relative positions

of terms have, however, frequently been used in order to place all terms in the order that is approximately correct. The remarks on the spectrum and the use of brackets to denote estimated values should suffice to explain the

procedure in the individual cases. The uncertainty x is also occasionally used to indicate

groups of detached terms that have not yet been con- nected by observation with the rest of the spectrum, but

whose multiplicity is the same as that of terms that are known. This is true for a group of terms of Sc i, for

example (p. 260).

6.6.

Interval

The term intervals in this column are, with a very few

exceptions, the differences between the level values of the

17 In a few spectra x has been omitted for this reason, as noted in the remarks.
XIV

components of terms in the preceding column. If, for a given term, the level of smallest J has the smallest

numerical value, and this succession holds for all components from the lowest to the highest, the intervals are

positive and the term is normal. On the contrary, if the

level of smallest numerical value has the largest J, etc., thoughout the term, the intervals are negative and the

term is inverted. The general run of intervals is positive or negative in a given spectrum according to whether the

shell of outer electrons is less than or greater than half

full (see sec. 7.1), although many exceptions to this

general rule occur.

If some components of a term are missing, the order in

which the J-values are listed is governed either by the

foregoing rules concerning the shell, or by the behavior of

other series members of the same type within the spectrum

or the sequence.

The J-values are always given either in increasing or decreasing order for a term, even if the term may be

partially inverted. For example, a

3P term has its Jvalues listed either in the order 2 , 1 , 0 or 0 , 1 , 2 even if this arrangement causes the levels to be given out of

numerical order. For such terms the signs of the intervals call attention to the irregularity, since both positive

and negative intervals occur whenever the term is partially inverted. The term 3d

6D of O hi, p. 52, starting

with the value 398135.0, is a term of this kind.

Estimated intervals are in brackets and are explained

in the remarks.

6.7 Observed gr-Value (Tables 1 to 4, Lande gr-Values)

When a spectrum is observed in a magnetic field of

suitable strength most lines are broken up into groups of

related components arranged in definite patterns. The

separations of the components are proportional to the

magnetic field strength and to magnetic splitting factors

(gr-values) characteristic of the atomic energy levels. The ^-values can be derived from a study of the observed

patterns. These determine the multiplicity and the

azimuthal and inner quantum numbers of the individual

atomic energy levels. The theoretical ^-values are well

known for the individual levels of terms of all types.

Consequently Zeeman patterns furnish one of the most

reliable criteria for the correct interpretation of a complex

Spectrum.

Details of the theoretical and experimental aspects of

this important subject will not be given here. Back and

Land6, Bacher and Goudsmit, H. E. White, 18 and many

others discuss it. Observed gr-values are given in the last column of the

tables. There is a surprising scarcity of reliable data on

observed Zeeman patterns among the spectra of the light

elements. The first entries in the table are for Ni.

Some papers state that the analysis is confirmed by the

observed Zeeman effect but give no details. The general

policy is to list here only those references that give observed

(7-values or sufficient data from which to calculate them.

The accuracy of the Zeeman material varies greatly and

depends on such factors as the determination of the magnetic field used for the observational data, the resolving

power of the spectroscope, the interpretation of the observed effect, and many others. As a result the listed

(7-values vary greatly in accuracy.

For spectra in which Z/S'-coupling holds the observed

values agree well with the Lande theoretical (7-values.

Because of their importance in spectrum analysis, these

theoretical values are given in tables 1, 2, 3, and 4. Table 1 contains J- and (7-values for terms of types S, P,

D . . . Q of odd multiplicity, i. e., singlet, triplet, quintet, . . . undecet terms. For example, the theoretical

(7-value of a

3F4 level is 1.250; that of a

7I6 level is 1.143.

Since the data are identical for odd and even terms alike, one table suffices for both sets of terms. Table 2 gives

similar data for terms of even multiplicity: doublets,

quartets, . . . decets.

For the convenience of those who are analyzing spectra,

the theoretical (7-values are also given in order of increasing numerical value followed by the designation of the

level or levels for each g, for terms of odd multiplicity in

table 3; and for those of even multiplicity in table 4. These (7-values are quoted from the “Tables of Theoretical

Zeeman Effects” by Kiess and Meggers, 19 supplemented

by their unpublished data for terms of multiplicity

greater than eight. 20 Their tables give also the theoretical

Zeeman patterns for practically all of the multiplet designations that have been observed within the range of

multiplicity they cover. Tables of theoretical (7-values for jj-coupling may be

found in papers by J. B. Green and his collaborators. 21 Finally, the date of completion of the manuscript of

each spectrum is given at the end of the table of energy

levels of the spectrum.

18 E. Back and A. LandG, Zeemaneffekt und Multiplettstruktur der Spektrallinien (Julius Springer, Berlin, 1925). F. Hund, Linienspektren und Periodisches System der Elemente (Julius Springer,

Berlin, 1927). R. F. Bacher and S. Goudsmit, Atomic Energy States (McGraw-Hill Book Co., Inc., New York, N. Y. and London, 1932). H. E. White, Introduction to Atomic Spectra (McGraw-Hill Book Co., Inc., New

York, N. Y., and London, 1934). E. U. Condon and G. H. Shortley, The Theory ofAtomic Spectra (The Macmillan Co., New York, N. Y.; The University Press, Cambridge, Eng., 1935). » Bur. Std. J. Res. 1, 641, RP23 (1928).

so They have extended their tables of theoretical Land6 0- values to include all types of terms and multiplicities (up to nQ) that are likely to be needed, in order that tables 1 to 4 may be complete. The writer is indebted to them for this useful contribution.

3‘ Phys. Rev. 52, 736 (1937); 54, 876 (1938); 58, 1094 (1940); 59, 72 (1941); 64, 151 (1943).
XV

7. Tables of Predicted and

With the exception of the simpler spectra and of those

for which the analysis is seriously incomplete, arrays of

observed terms are given following the individual tables

of energy levels, the first being that of Be i, p. 13. As stated above, the arrays of terms to be expected for a given configuration are well known from theory. A

comparison of the terms observed in a given spectrum

with those predicted reveals at once the completeness of

the analysis. To facilitate this comparison, arrays of

predicted terms arranged similarly to those of the observed terms are included here.

7.1. Shells

In the discussion of notation (sec. 5) reference was made

to the “shells” of electrons and their importance in the

production of spectroscopic terms. A clear description of

these shells is quoted from White,22 p. 80: “The various

electrons are classified under so-called shells of electrons.

All electrons belonging to the same shell are characterized by

the same total guantum number n. ...”

“The shells n= 1, 2, 3, 4, . . . are sometimes called

(from x-ray spectra) the K, L, M, N, . . . shells, respectively.”

“The electrons in any shell n are further divided into

subshells so that electrons belonging to the same subshell

have the same azimuthal guantum number l. Electrons for

which 1=0, 1, 2, 3, . . . are called s, p, d,j, . . . electrons,

respectively, . . .”. For example, 2s is used to specify one electron with 1=0 and in the shell n=2.

No shell can contain more than 2 type-s electrons start- ing with 7i=l, 6 type-p electrons starting with n=2,

10 type-<f electrons starting with 71=3, or 14 type-/ electrons starting with n=4, etc. The successive periods 1 to 7 in the periodic system (sec. 8.3) can, therefore, contain only 2, 8, 8, 18, 18, 32, and 32 elements, respectively.

These are consequences of Pauli’s exclusion principle.

This is illustrated in the following brief tabular excerpt

from White’s complete Table of Electron Configurations:

Shell K

71 — 1 L

71 =2 Subshell 1=0 1=0 1=1

1 H Is 2 He Is2

3 Li Is2 2s 4 Be Is2 2s2

5 B Is2 2s2 2P

6 C Is2 2s2 2p

2

21 H. E. White, Introduction to Atomic Spectra (McGraw-Hill Book Co., Inc., New

York, N. Y., and London, 1934).

Observed Arrays of Terms

Superscripts denote the number of electrons of a given

type. Where no superscript is given unity is understood.

He i, for example, has two electrons of the type Is, as indicated by Is2 in the above array. These similar elec- trons are known as eguivalent electrons. The terms produced by eguivalent and noneguivalent electrons and detailed discussions of Pauli’s exclusion principle may be

found in many standard treatises on atomic spectra.23 All spectra having the same shells of electrons are

similar. An isoelectronic seguence consists of spectra of

different elements having the same shells of electrons.

Each arc spectrum sets the pattern for the sequence, so

far as the effective electrons are concerned. For example,

the spectra of Be i, B n, C hi, etc., form an isoelectronic

sequence for which Be i, the arc spectrum of beryllium,

sets the pattern, i. e., the Be i isoelectronic sequence. In

B ii, the first spark spectrum of B, the boron atoms have

lost the outer electron, 2p. This spectrum, therefore, re- sembles that of Be i having two 2s electrons (denoted by

2s2

) outside the closed shell Is2

. Similarly the carbon

atoms have lost both outer 2p-electrons when the spectrum

of C hi is observed. This spectrum thus belongs in the same sequence. An array of predicted terms of each arc spectrum suffices, therefore, for all spectra of the sequence,

as, for example, Be i. No arrays are given for spectra of the H, He i, Li i, and similar sequences. Since only Is, Is2

, and 2s electrons are involved, the arrays of predicted and observed

terms are simple.

7.2. Arrays of Predicted Terms of the Sequences Bei

Through Nei (Tables 5 to 11)

Starting with Be i, predicted arrays of terms of the

isoelectronic sequences from Be through Ne are given in

the following tables (pages xxvm to xxxi)

:

Table Sequence

5 Be i 6 B i 7 C i 8 N i 9 O i 10 Fi

11 Ne i

In all of these tables the closed shells are indicated immediately under the heading “Config.” (“ls2 +” for this

group of spectra). The tables are divided into two sections. The upper half gives the terms from equivalent

» H. N. Russell, Phys. Rev. 29, 782 (1927). R. C. Gibbs, D. T. Wilbur, and H. E. White, Phys. Rev. 2#, 790 (1927). F. Hund, Linienspektren und Periodisches System der Elemente (Julius Springer,

Berlin, 1927)

.

C. L. B. Shudeman, J. Franklin Inst. 224, 601 (1937). (Terms from equivalent g, A, and i electrons.)
XVI

electrons and, for simpler spectra, the first low series members. The lower half indicates the series to be expected

from the various limit terms (sec. 5.1), with the running

electron denoted as nx, where n is the total quantum

number, and x the type of electron, s, p, d, j, . . ., etc. The quantities n and x are indicated in the headings, nx (n^3), etc., above the columns of the tables and are evaluated in the arrays of observed terms of the separate

spectra of the sequence. For example, the ns 3S series of

Be i, p. 13, with the configuration 2s(2S)na: has been

observed from n—3 through n=%.

Many more terms can be predicted than are likely to be observed. The present tables are designed to contain enough predicted terms to suffice for all terms thus

far observed in any spectrum of the sequence.

7.3.

Arrays of Predicted Terms of the Sequences Mgi

Through Ai, (Tables 12 to 18)

Starting with Mg i, arrays of predicted terms of the

isoelectronic sequences from Mg through A are given in

the following tables (pages xxxn to xxxv):

Table Sequence

12 Mg i 13 All

14 Si i 15 Pi

16 Si

17 Cl i 18 Ai

A comparison of these tables with the set described above,

tables 5 to 11, shows that the same terms are predicted

for spectra having the same numbers and types of electrons outside the closed shells. Beginning with table 12,

the closed shells are Is2 2s2 2

p

6 (entered directly under the

heading “Config.” in the tables). The total quantum

number n of the running electron is one unit larger, but

the term arrays are identical for similar spectra in the

two sets of tables. For example, tables 5 and 12, 6 and

13, etc., are alike, except for the total quantum numbers

and for the number of predicted terms included, which is governed by the terms that have been observed within

the sequence.

7.4.

Arrays of Predicted Levels of the Nei and Ai

Sequences (Tables 11 and 18)

These tables give both predicted terms (Z/S'-coupling)

and predicted pairs of levels (jZ-coupling) sec. 5.2. In

the arrays of predicted and observed pairs of levels for

these spectra, the pairs are fisted in the general order of

increasing value of the lower member of the pair, as suggested by Shortley. As some spectra in this sequence are

of an intermediate type, more nearly Z/S'-coupling, this

order is not always obeyed numerically among the observed levels, but is retained in these tables for uniformity.

Similarly, in all of these tables (5 to 18, inclusive) and

the corresponding arrays of observed terms, the limit

terms are fisted in the general order of increasing numerical value with primes added to indicate higher limits, as

described in section 5.1. 7.5.

Arrays of Predicted Terms of the Sequences Cai

Through V i (Tables 19 to 22)

Brief mention has been made of the special notation

adopted for complex spectra (sec. 5.3). An examination

of the tables for the sequences Cai, Sci, Tii, and Vi,

tables 19 to 22, inclusive, reveals the rapid increase in the

number of terms after d electrons are included in the

structure of the unexcited atom. The use of primes is

retained to indicate the different limits in Cai and in

table 19. For Scii and subsequent spectra in the se- quence, the notation for complex spectra is introduced

(see below). Since the limits are carefully specified, no

difficulty should arise in comparing the arrays of observed

and predicted terms in this sequence.

For the configurations involving equivalent electrons,

fisted in the upper section of each array, Pauli’s principle

restricts the array of resulting terms, and the latter can- not be unequivocally assigned to specific limits.

When only s and p electrons appear in the low configurations the ground state is always to be found in the

upper section, but in the lower, when d electrons are

present in a configuration involving one s electron. Examples among arc spectra may be found in table 23, and

others occur for singly ionized atoms.

Beginning with the Sci sequence terms from eight

limits must be considered. For this reason, a simple type

of prefix a, b, c, . . . z, y, x, etc., is adopted for the terms

from the different limits. In the Ti i group 15 limits

must be handled, and in Vi the number increases to

22. For these complex spectra the limits in the tables of

predicted terms are tabulated in order of increasing numerical value of the terms in the arc spectrum of the se- quence, Tii for example. The same order does not

necessarily apply to the other spectra in the sequence.

In the arrays of observed terms the prefixes a, b, etc., of

the limit terms are given in order to avoid confusion in

comparing the different sets of tables.

As the complexity of the spectra increases there is a

serious overlapping of families of terms from the various

limits. The assignment of electron configurations is ambiguous in many cases. Beginning with Tii, a number of question marks and colons appear in the arrays of

observed terms, denoting the uncertainty of many suggested configurations.
XVII

8. The Periodic Table

8.1. The Chemical Elements by Atomic Number, Ionization Potentials (Table 23)

In the present work the elements are handled in order

of increasing atomic number and they are listed in this

order in table 23. Column one gives this number, Z;

column two, the name of the element; and column three,

the Chemical symbol. Columns four and five give, re- spectively, the principal ionization potential and configuration of the ground state of the neutral atom. For

elements with Z>23, i. e., for those beyond the range of

the present volume, these data are taken from table 1, columns 5 and 9, respectively, of the key to the Periodic

Chart of the Atoms revised in 1947 by Meggers.24 Additional data on the ground states of the rare earths are given in his paper on this subject.25

8.2.

The Chemical Elements by Chemical Symbol

(Table 24)

Bacher and Goudsmit arranged the spectra in the al- phabetical order of the chemical symbol of the element.

Table 24 gives the elements in this order, with the chemical symbol in column one followed by the name of the

element in column 2 and the atomic number in column 3.

8.3.

The Periodic System (Table 25)

The Periodic System in table 25 is arranged in the form

suggested by Catalan, who generously furnished an unpublished copy for inclusion here.

8.4.

Index—Isoelectronic Sequences (Table 26)

This table contains the index to the data in Volume I

of this work, the spectra from H through V. In the left

margin the atomic number is given, followed by the chemical symbol. Across the top the successive stages of

ionization appear, i denoting arc spectra, n first spark

spectra, m second spark spectra, etc. The numbers in

the table indicate the pages on which the individual spectra

may be found. For example, Fviii is on page 75. In this table, isoelectronic spectra appear on the diagonals. Every other diagonal is printed in bold face type

in order to emphasize the spectra of each sequence. For

example, S ix belongs to the O i sequence, printed in boldface along the diagonal. Similarly, Mgvi can be traced

to N i along the diagonal not printed in bold face. Blanks

occur for spectra that have not yet been analyzed.

No sequences are carried beyond V in this volume, but

they will be continued in later volumes and indicated in

tables arranged similarly to this one. The sequences

started in Volume I but not completed there are fisted

below. The last spectrum in each sequence for which

any data on analysis are known is indicated.

Sequence Spectrum Sequence Spectrum

Nei Co xviii Cl i Ni xii Nai Cuxix Ai Feix

Mg i Co xvi Ki Fe vm

A1

1

Ni xvi Cai Ni ix

Si i Ni xv Sc i Ni viii Pi (Vix) 1 Tii Ni vii Si Nixin Vi Cu vii

i This sequence is completed in the present volume.

9. Future Investigations

9.1. Need for Further Analysis

During the course of this compilation many interesting

problems have presented themselves. The gaps in the

sequences call attention to some spectra in which no

structure has as yet been recognized. Within the se- quences these gaps include the following spectra: Nevn,

vm, ix; Nax; Sxi; Clxn, xm; Axil, xhi; Kxn, xin,

xiv; Caxiv; and Vx. If, in addition, Fix and Nex

could be observed, the spectra of all possible stages of

ionization would be represented for these two elements.

A careful study of the configurations in which a 3d

electron becomes effective, is desirable. In the Fi seM W. M. Welch Scientific Co., 1515 Sedgwick St., Chicago 10, El., U. S. A. (Chart and

key, $7.50; key, $1.00). For Mm and Mol Catalan’s revised values are quoted. The

data on Tc i are from Meggers. M Electron Configurations of “Rare-Earth” Elements, Science 105, 514, No. 2733 (May

16, 1947).

quence the terms with 3c? and 4c? electrons for Na hi

Mg iv, Alv, and Sivi should be verified, as there are marked irregularities along this sequence.

In Sii the 3d 3D° term is lower than 3p3 3D°, but the

reverse is true for the rest of the sequence.

In the Pi sequence the configuration assignments of

terms in which 3^4

, 3c?, and 4s electrons are involved,

should be examined along the sequence. More observations are also needed to verify the extensive extrapolations

from Kv on. Similar remarks apply to some spectra of the Cl i se- quence, particularly to Caiv, where various authors disagree on the interpretation. Analogous terms along this

sequence are strikingly irregular as regards both position

and intervals. Many such irregularities could be pointed

out. It is hoped that the present work will stimulate

further study along these fines.
XVIII

The arrays of observed terms enable one to detect a number of conspicuous missing terms whose positions can

be estimated by analogy with neighboring related terms.

For example, Russell 26 has suggested that the 3d

,n 2G

term in Oiv might be found. To quote him “It should

give a strong combination with 3p'" 2F°, lying in the

violet or near ultraviolet.” Similarly, the absence of the

3d

2F term of Cl hi is conspicuous. Russell has also com- mented on the incompleteness of the analyses of Sin

and S iv. In He i the term ll^S is missing from the series. In

Mgi Sbortley has called attention to the fact that the

triplets are higher than the singlets, an anomaly that

appears to be unexplained.

The general need for further analysis can perhaps best

be visualized by a comparison of the arrays of observed

and predicted terms of the various spectra. This procedure enables the user to grade each analysis for himself.

For spectra whose energy levels are not yet tabulated for

this program it is recommended that be consult the existing surveys of spectrum analysis.27 Perhaps the most urgent needs of the astrophysicist are extensions to the work on the second and third spark

spectra in the first long period (except for Fe hi, which is well known). Many spectra of the heavier elements are incompletely analyzed and much work remains to be done on the highly complex spectra of the rare earths.

9.2.

Term Intervals

A careful examination of the term intervals within a spectrum and in related spectra affords a useful check on

the correctness of the analysis. In regular terms the intervals are roughly proportional to the larger J-values of

the term, and term separations of similar terms usually

increase smoothly along the sequence. Enough data are presented here for an extensive survey of this subject.

The theoretical as well as observational aspects of this

topic and its important relation to configuration assignments need not be emphasized to workers on spectrum

analysis.

9.3.

Series Spectra—Rydberg Denominators

Requests have been made for a tabulation of absolute

term values and Rydberg denominators of the series members of each spectrum in which series have been detected,

including the J-values of the limit terms. The need for a

critical compilation of this material is fully appreciated.

It is felt, however, that such a project can best be handled

28 Letter (Aug. 1947).

27 W. F. Meggers, J. Opt. Soc. Am. 36, 433 (1946); C. E. Moore, RMT (1946).

in a program restricted to the study of series in atomic

spectra. Standard treatises such as Fowler’s Report on

Series in Line Spectra and Paschen-Gotze’s Seriengesetze

der Linienspektren, the paper by Catalan and Poggio,28 etc., together with other references included under the separate

spectra should provide some data for those who are

interested.

9.4.

Observed Zeeman Patterns

A glance at the data on Zeeman effect in this volume

alone, reveals a glaring need of further observations. The

first entry of ^-values occurs in the spectrum of N i. An

outstanding example may be found in Ti i. The best observed ^-values obtainable from existing data are given,

and they serve remarkably well to confirm the analysis.

For Ti, and also for other elements, however, Harrison 29 has made extensive observations that doubtless show

many excellently resolved patterns and would yield precise observed (/-values, but his data for a number of complex spectra have not yet been utilized. A wealth of information is in store for future study in this field.

9.5.

Energy or Grotrian Diagrams

There have been urgent requests to prepare a homogeneous set of energy diagrams to accompany these tables.

This topic is handled very inadequately here. If the

individual authors have included either an energy level

diagram or a Grotrian diagram,30 this fact is indicated by

the symbol (E D) or (GB) following the references. If not, recourse to general references such as Grotrian’s

classical publication 31 or White’s Introduction to Atomic

Spectra 32 must be had. Readers are warned that the

existing diagrams are far from uniform in style and scale

and that many of them are not up to date, i. e., they do

not represent the analysis as given in the tables. In

many cases, the most notable being probably that of A i, the writer has been unable to locate diagrams representing

the analysis.

The present work would be seriously delayed by the

inclusion of diagrams, but the energy levels as recorded

here furnish the requisite material for such a project.

Only a few of the many interesting subjects for future

investigation have been touched upon. If this work provides the inspiration and stimulus for at least some of

them, it will have been justified. « Zeit. Phys. 102, 461 (1936).

28 Reports on Progress in Physics 8, 228 (1941).

20 In energy diagrams only the positions of the levels or terms are indicated. In Grotrian diagrams lines indicating observed combinations connect the terms.

31 Oraphische Darstellung der Spektren von Atomen und Ionen mit ein, zwei und drei Valenzelektronen, Part II (Julius Springer, Berlin, 1928).

32 H. E. White, Introduction to Atomic Spectra (McGraw-Hill Book Co., Inc., New

York, N. Y.t and London, 1934).
XIX

10. Acknowledgments

Many scientific workers and many institutions at home

and abroad are represented in this work. The cordial

collaboration and generous supply of unpublished material

have been extremely gratifying.

Members of the National Research Council Committee

on Line Spectra of the Elements bare given enthusiastic

support to the program. The chairman, H. N. Russell,

has placed at the disposal of the writer the large collec- tion of spectroscopic data accumulated at Princeton from

the time the committee was formed in 1924. He has

furnished unpublished analyses (Cai, Sci, Til, Tin) and

read all of the manuscript. Throughout the work he has

been a valued and keenly interested consultant.

This undertaking has been made possible by the enthusiastic support of E. U. Condon, Director of the Bureau

of Standards, and W. F. Meggers, Chief of the Spectroscopy Section. The personal interest taken by Dr.

Condon has been a continual source of encouragement.

The careful supervision and valued suggestions of Meggers, based on his wide experience and expert judgment,

greatly enhance the value of this Circular. C. C. Kiess

has also been ever ready to give the writer unpublished

material (Ni, Oi) and authoritative and helpful suggestions on many important and troublesome questions.

Other members of the Committee who have responded

generously with data and stimulated further research for

this program are J. E. Mack, who calculated all of the

data on the spectra of the H sequence especially for inclusion here; and A. G. Shenstone, who submitted important unpublished results on C i, and Ca n. The most extensive contributions in manuscript form

have come from Sweden, from B. Edl6n and his colleagues.

The writer had the benefit of a conference with Edl6n

during his visit to Washington shortly after this project

had been started. From that time he has continuously

supplied unpublished analyses and valuable comments as each section of the book was being prepared. His contributions include data on selected spectra from Be through

O, on all the spectra of F, and complete term arrays of

the arc spectra of Ne, S, and A. It has also been possible to include the spectra of higher ionization of Al,

Si, and S only because E. Femer submitted his unpublished manuscript on these spectra. H. A. Robinson supplied his material on the spectra Pvi through Pxiii

together with comments on related spectra of Ne through

Si; and K. Liden furnished his data on F i. The writer has had much helpful advice from G.

Shortley on spectra of the Nei and Ai sequences. M.

A. Catalan of the University of Madrid has been a most

helpful consultant throughout his entire stay in the United

States. He calculated the ^-values of Sci, Scii and Tin

for inclusion here.

Manuscripts by H. R. Kratz (Ki), by K. W. Meissner,

L. G. Mundie and P. Stelson (Lii), by E. R. Thackeray

(Nai), by W. E. Lamb, Jr., and R. C. Retherford (H),

by H. E. Clearman, Jr., (Bi) and by F. Rohrhch (Tii);

and a reprint on Ni sent from Japan by T. Takamine have

been submitted especially for use in connection with this

program. The writer has attempted to record her

gratitude to each one in the pages of the book itself. No project of this kind can be completed without the

cooperation of experts in many lines. One of the greatest

rewards has been the pleasure afforded by these contacts. Miss Sarah A. Jones, Librarian at the Bureau, and her

competent staff deserve special mention for the splendid

assistance they have so willingly given in locating hundreds of references. Mrs. Isabel D. Murray has also

provided much expert technical assistance.

The details of publication of spectroscopic data such

as those included here present a most taxing and difficult problem; one which has been ably and efficiently handled

by Publications Section of the Bureau, the Department

of Commerce, and the Government Printing Office. The

painstaking care, cordial cooperation, and skill of J. L.

Mathusa and his staff in the Publications Section of the

Bureau are lasting contributions that can be fully appreciated only by the many users of this Circular. In the

Department of Commerce, V. Vasco, and, in the Government Printing Office, H. D. Merold, have been equally

cooperative. The book reflects their personal interest

and skill and those of all whose services they have

enlisted. It is a pleasure to the writer to record here her appreciation of the enormous amount of assistance all have so graciously given her.

She is also extremely grateful to her husband, B. W.

Sitterly, for his many helpful suggestions and cordial

cooperation throughout this work.
XX

Table 1. Land^ ^-values

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 0/0 1 2. 000 2 2. 000 3 2. 000 4 2. 000 5 2. 000

P 1 1. 000 2 1. 500 3 1. 667 4 1. 750 5 1. 800 6 1. 833

1 1. 500 2 1. 833 3 1. 917 4 1. 950 5 1. 967

0 0/0 1 2. 500 2 2. 333 3 2. 250 4 2. 200

D 2 1. 000 3 1. 333 4 1. 500 5 1. 600 6 1. 667 7 1. 714

2 1. 167 3 1. 500 4 1. 650 5 1. 733 6 1. 786

1 0. 500 2 1. 500 3 1. 750 4 1. 850 5 1. 900

1 1. 500 2 2. 000 3 2. 083 4 2. 100

0 0/0 1 3. 000 2 2. 667 3 2. 500

F 3 1. 000 4 1. 250 5 1. 400 6 1. 500 7 1. 571 8 1. 625

3 1. 083 4 1. 350 5 1. 500 6 1. 595 7 1. 661

2 0. 667 3 1. 250 4 1. 500 5 1. 633 6 1. 714

2 1. 000 3 1. 500 4 1. 700 5 1. 800

1 0. 000 2 1. 500 3 1. 833 4 1. 950

1 1. 500 2 2. 167 3 2. 250

0 0/0 1 3. 500 2 3. 000

G 4 1. 000 5 1. 200 6 1. 333 7 1. 429 8 1. 500 9 1. 556

4 1. 050 5 1. 267 6 1. 405 7 1. 500 8 1. 569

3 0. 750 4 1. 150 5 1. 367 6 1. 500 7 1. 589

3 0. 917 4 1. 300 5 1. 500 6 1. 619

2 0. 333 3 1. 167 4 1. 500 5 1. 667

2 0. 833 3 1. 500 4 1. 750

1 -0. 500 2 1. 500 3 1. 917

1 1. 500 2 2. 333

0 0/0 1 4. 000

H 5 1. 000 6 1. 167 7 1. 286 8 1. 375 9 1. 444 10 1. 500

5 1. 033 6 1. 214 7 1. 339 8 1. 431 9 1. 500

4 0. 800 5 1. 100 6 I. 286 7 1. 411 8 1. 500

4 0. 900 5 1. 200 6 1. 381 7 1. 500

3 0. 500 4 1. 050 5 1. 333 6 1. 500

3 0. 750 4 1. 250 5 1. 500

2 0. 000 3 1. 083 4 1. 500

2 0. 667 3 1. 500

1 - 1. 000 2 1. 500

] 1. 500

0 0/0

I 6 1. 000 7 1. 143 8 1. 250 9 1. 333 10 1. 400 11 1. 455

6 1. 024 7 1. 179 8 1. 292 9 1. 378 10 1. 445

5 0. 833 6 1. 071 7 1. 232 8 1. 347 9 1. 433

5 0. 900 6 1. 143 7 1. 304 8 1. 417

4 0. 600 5 1. 000 6 1. 238 7 1. 393

4 0. 750 5 1. 133 6 1. 357

3 0. 250 4 0. 950 5 1. 300

3 0. 583 4 1. 200

2 -0. 333 3 1. 000

2 0. 500

1 - 1. 500

K 7 1. 000 8 1. 125 9 1. 222 10 1. 300 11 1. 364 12 1. 417

7 1. 018 8 1. 153 9 1. 256 10 1. 336 11 1. 402

6 0. 857 7 1. 054 8 1. 194 9 1. 300 10 1. 382

6 0. 905 7 1. 107 8 1. 250 9 1. 356

5 0. 667 6 0. 976 7 1. 179 8 1. 319

5 0. 767 6 1. 071 7 1. 268

4 0. 400 5 0. 900 6 1. 191 4 0. 600 5 1. 067

3 0. 000 4 0. 850

3 0. 417

2 -0. 667
XXI

Table 1. Lande <7-values—Continued

Multiplicity

Singlets Triplets Quintets Septets Nonets Undecets

Term

1 3 5 7 9 11

J g J g J g J g J 9 J g

L 8 1. 000 9 1. 111 10 1. 2C0 11 1. 273 12 1. 333 13 1. 385

8 1. 014 9 1. 133 10 1. 227 11 1. 303 12 1. 365

7 0. 875 8 1. 042 9 1. 167 10 1. 264 11 1. 341

7 0. 911 8 1. 083 9 1. 201 10 1. 309

6 0. 714 7 0. 964 8 1. 139 9 1. 267

6 0. 786 7 1. 036 8 1. 208

5 0. 500 6 0. 881 7 1. 125

5 0. 633 6 1. 000

4 0. 200 5 0. 800

4 0. 450

3 -0. 250

M 9 1. 000 10 1. 100 11 1. 182 12 1. 250 13 1. 308 14 1. 357

9 1. Oil 10 1. 118 11 1. 205 12 1. 276 13 1. 335

8 0. 889 9 1. 033 10 1. 145 11 1. 235 12 1. 308

8 0. 917 9 1. 067 10 1. 182 11 1. 273

7 0. 750 8 0. 958 9 1. Ill 10 1. 227

7 0. 804 8 1. 014 9 1. 167

6 0. 571 7 0. 875 8 1. 083

6 0. 667 7 0. 964

5 0. 333 6 0. 786

5 0. 500

4 0. 000

N 10 1. 000 11 1. 091 12 1. 167 13 1. 231 14 1. 206 15 1. 333

10 1. 009 11 1. 106 12 1. 186 13 1. 253 14 1. 310

9 0. 900 10 1 027 11 1. 129 12 1. 212 13 1. 280

9 0. 902 10 1. 055 11 1. 159 12 1. 244

8 0. 778 9 0. 906 10 1. 091 11 1. 197

8 0. 819 9 1. 000 10 1. 136

7 0. 625 8 0. 875 9 1. 056

7 0. 696 8 0. 944

6 0. 429 7 0. 786

6 0. 548

5 0. 167

0 11 1. 000 12 1. 083 13 1. 154 14 1. 214 15 1. 267 16 1. 312

11 1. 008 12 1. 096 13 1. 170 14 1. 233 15 1. 288

10 0. 909 11 1. 023 12 1. 115 13 1. 192 14 1. 257

10 0. 927 11 1. 045 12 1. 141 13 1. 220

9 0. 800 10 0. 955 11 1. 076 12 1. 173

9 0. 833 10 0. 991 11 1. 114

8 0. 667 9 0. 878 10 1. 036

8 0. 722 9 0. 933

7 0. 500 8 0. 792

7 0. 589

6 0. 286

Q 12 1. 000 13 1. 077 14 1. 143 15 1. 200 16 1. 250 17 1. 294

12 1. 006 13 1. 088 14 1. 157 15 1. 217 16 1. 268

11 0. 917 12 1. 019 13 1. 104 14 1. 176 15 1. 238

11 0. 932 12 1. 038 13 1. 126 14 1. 200

10 0. 818 11 0. 955 12 1. 064 13 1. 154

10 0. 845 11 0. 985 12 1. 096

9 0. 700 10 0. 882 11 1. 023

9 0. 744 10 0. 927

8 0. 556 9 0. 800

8 0. 625

7 0. 375
XXII

Table 2. Lande ^-values

Term

Multiplicity

Doublets

2

Quartets

4

Sextets

6

Octets 8

Decets

10

J 9 J 9 J 9 J 9 J 9

S )4 2. 000 I/2 2. 000 2)4 2. 000 3)4 2. 000 4/ 2. 000

P V/2

Vl

1. 333 2)4 1. 600 3/2 1. 714 4/ 1. 778 5/ 1. 818

0. 667 V/2 1. 733 2)4 1. 886 3/ 1. 937 4/ 1. 960

Yz 2. 667 v/2 2. 400 2/ 2. 286 3/2 2. 222

D 2)4 1. 200 3/2 1. 429 4)4 1. 556 5/ 1. 636 6/2 1. 692

IV2 0. 800 2% 1. 371 3/2 1. 587 4/ 1. 697 5/ 1. 762

1)4 1. 200 2/2 1. 657 3/ 1. 809 4)4 1. 879

Yz 0. 000 1)4 1. 867 2/ 2. 057 3/ 2. 095

)4 3. 333 V/2 2. 800 2/ 2. 572

F 3X 1. 143 4/2 1. 333 5)4 1. 455 6/2 1. 538 7/z 1. 600

2)4 0. 857 3/2 1. 238 414 1. 434 5/ 1. 552 6/2 1. 631

2/2 1. 029 3)4 1. 397 4/ 1. 576 5)4 1. 678

1/2 0. 400 2)4 1. 314 3/ 1. 619 4)4 1. 758

V/2

V2

1. 067 2/ 1. 714 3)4 1. 905

-0. 667 1)4 2. 000 2)4 2. 229

)4 4. 000 1/2 3. 200

G 4/2 1. Ill 5)4 1. 273 6)4 1. 385 7)4 1. 467 8)4 1. 529

3X 0. 889 4/2 1. 172 5)4 1. 343 6/2 1. 456 7/2 1. 537

3/2 0. 984 4)4 1. 273 5/ 1. 441 6)4 1. 549

2)4 0. 571 3)4 1. 143 4/ 1. 414 5/ 1. 566

2)4 0. 857 3)4 1. 365 4/ 1. 596

1)4 0. 000 2/ 1. 257 3/ 1. 651

1/2 0. 933 2/ 1. 772

Yz -1. 333 VA 2. 133

/z 4. 667

H 5)4 1. 091 ey2 1. 231 7)4 1. 333 8/2 1. 412 9/ 1. 474

4X 0. 909 5y2 1. 133 6)4 1. 282 7/2 1. 388 8/2 1. 467

4y2 0. 970 5)4 1. 203 6/2 1. 354 7/z 1. 459

3)4 0. 667 4/2 1 . 071 5/2 1 . 301 6/2 1 . 446

3)4 0. 825 4/2 1 . 212 5)4 1 . 427

2)4 a 286 3/2 1 . 048 4/ 1 . 394

2/2 0. 686 3)4 1 . 333

1/2 -0. 400 2/ 1. 200

1/2 0. 800

Yz -2. 000

I 6)4 1. 077 7)4 1 . 200 8)4 1. 294 9/2 1 . 368 IO/2 1. 429

5)4 0. 923 6)4 1 . 108 7/2 1. 239 8/2 1 . 337 9/ 1 . 414

5)4 0. 965 6/2 1. 159 7)4 1 . 294 8)4 1 . 393

4)4 0. 727 5/2 1 . 035 6/2 1 . 231 7/ 1 . 365

4/2 0. 828 5)4 1 . 133 6/2 1. 323

3/2 0. 444 4/ 0. 970 5)4 1 . 259

3/ 0. 667 4)4 1. 152

2/ 0. 000 3/ 0. 952

2)4 0. 514

1 Yz -0. 800

K 7/2 1. 067 8)4 1 . 176 9/2 1. 263 IO/2 1 . 333 ny2 1. 391

6)4 0. 933 7)4 1 . 090 8/2 1 . 207 9/ 1 . 298 iov2 1 . 371

6)4 0. 964 7/2 1 . 129 8)4 1 . 251 9/2 1 . 343

5)4 0. 769 6/2 1 . 015 7/ 1 . 184 8/2 1 . 307

5/2 0. 839 6/2 1 . 087 7/2 1 . 255

4/2 0. 545 5/ 0. 937 6/2 1 . 179

4)4 0. 687 5/2 1 . 063

3Y 0. 222 4/2 0. 869

3/2 0. 508

2Yz -0. 286
XXIII

Table 2. Lande ^-values

Continued

1

1

Term

Multiplicity

Doublets

2

Quartets

4

Sextets

6

Octets

8

Decets

10

J 9 J 9 J 9 J 9 J 9

L 8/ 1. 059 9 / 1. 158 10/ 1. 238 11/ 1. 304 12/ 1. 360

7z 0. 941 8/2 1. 077 9/ 1. 183 10 / 1. 267 11/ 1. 336

7/ 0. 965 8/ 1. 108 9/ 1. 218 10/ 1. 304

6/2 0. 8C0 7/ 1. 004 8/ 1. 152 9/ 1. 263

6/ 0. 851 7/ 1. 059 8/ 1. 207

5/ 0. 615 6/ 0. 923 7/ 1. 129

5/ 0. 713 6/ 1. 015

4/ 0. 3C4 5/ 0. 839

4/ 0. 545

3/ 0. 000

M 9/ 1. 053 10/ 1. 143 11/ 1. 217 12/ 1. 2C0 13/ 1. 333

8/ 0. 947 9/ 1. 068 10/ 1. 164 11/ 1. 242 12/ 1. 307

8/2 0. 966 9/ 1. 093 10/ 1. 193 11/ 1. 273

7/ 0. 824 8/ 0. 997 9/ 1. 128 10 / 1. 230

7/ 0. 863 8/ 1. 040 9/ 1. 173

6/ 0. 667 7/ 0. 918 8/ 1. 096

6/ 0. 738 7/ 0. 988

5/ 0. 462 6/ 0. 831

5/ 0. 58 7 4/ 0. 182

N 10/ 1. 048 11/ 1. 130 12/ 1. 200 13/ 1. 259 14/ 1. 310

9/ 0. 952 10/ 1. 060 11/ 1. 148 12/ 1. 221 icz 1. 282

9/ 0. 967 10/ 1. 081 11/ 1. 172 12/ 1. 247

8/ 0. 842 9/ 0. 992 10/ 1. 110 11 / 1. 203

8/ 0. 873 9/ 1. 028 10 / 1. 147

7/ 0. 706 8/ 0. 916 9/ 1. 073

7/ 0. 761 8/ 0. 972

6/ 0. 533 7/ 0. 83 L 6/ 0. 62 i 5/ 0. 308

0 11 / 1. 043 12/ 1. 120 13/ 1. 185 14/ 1. 241 15/ 1. 290

10/ 0. 957 11/ 1. 054 12/ 1. 135 13/ 1. 203 14/ 1. 261

10/ 0. 969 11/ 1. 071 12/ 1. 156 13/ 1. 226

9/ 0. 857 10/ 0. 990 11/ 1. 096 12/ 1. 182

9/ 0. 882 10/ 1. 019 11/ 1. 127

8/ 0. 737 9/ 0. 917 10/ 1. 056

8/ 0. 780 9/ 0. 962

7/ 0. 588 8/ 0. 836

7/ 0. 659

6/ 0. 400

Q 12/ 1. 040 13/ 1. Ill 14/ 1. 172 15/ 1. 226 16/ 1. 273

11/ 0. 960 12/ 1. 049 13/ 1. 124 14/ 1. 188 15/ 1. 243

11/ 0. 970 12/ 1. 064 13/ 1. 142 14/ 1. 208

10/ 0. 870 11/ 0. 988 12/ 1. 084 13/ 1. 165 10/ 0. 890 11/ 1. 012 12/ 1. Ill 9/ 0. 762 10/ 0. 919 11/ 1. 043

9/ 0. 797 10/ 0. 957

8/ 0. 632 9/ 0. 842

8/ 0. 687

7/ 0. 471
XXIV

Table 3. Land£ ^-values—Terms of Odd Multiplicity in Order of Increasing g

g Desig. g Desig. g Desig. g Desig.

-1. 500 “It 0. 744 9 Q9 0. 955 7O10

7Qn 1. 076 9 0„ - 1. 000 9Ha 0. 750 3 G3 5 M7

7H3 0. 958 7 M8 1. 077 3 Qi3 -0. 667 “K2

7D 0. 964 7 L7 uM7 1. 083 3 F3

3 012

7L8 -0. 500 7 G4 0. 767 7 K5 0. 976 7 k8

9 h3 xx m8 -0. 333 eI2 0. 778 5 n8 0. 985 9 Qii 1. 088 B Qi3 -0. 250 XX L, 0. 786 7 L6 u M6 un7 0. 991 9 O10 1. 091 3 Nn

9 N10

0. 000 BF! 7H2 9 K3 0. 792 xx 08 1. 000 J P1 7 D2 if, 1. 096 b 012 "Q12 “M4 0. 800 3H4

5 0# “PS 7 G4 ^5 lie 1. 100 3 Mio 5H6

0. 167 un5

xx q9 1K7

x L8 >M, 1. 104 7 Qi3

0. 200 9 L4 0. 804 7 M7 ’Nu x On x Q12 1. 106 BN„

0. 250 7 i3 0. 818 5 Qio 5 F2

7 i59 n9 1. 107 7 K7

0. 286 1X 08 0. 819 7 N8 nI3 1x L8 1. Ill 3 L9 9 M,

0. 333 5 G2

9 M5 0. 833 3 i5

7 G2 70# 1. 006 3 Ql2 1. 114 xx o„

0. 375 n

Q: 0. 845 7 Qio 1. 008 3 On 1. 115 7012

0. 400 7 K4 0. 850 “K4 1. 009 3 Nio 1. 118 5 Mio

0. 417 xx K3 0. 857 3 k8 1. Oil 3 M9 1. 125 3 K8 “L:

0. 429 9 N6 0. 875 3 L7 9 M7 9 Ng 1. 014 3 l8

9 M8 1. 126 9 Qi3

0. 450 uL4 0. 878 9 Ofl 1. 018 3 k7 1. 129 7N„

0. 500 3 Di 5H3

7 Ls 0. 881 fl Le 1. 019 5 Q12 1. 133 bl9 »I5 »07 nI2 u m5 0. 882 9 Qio 1. 023 5Ou

xx Qii 1. 136 XX N10

0. 548 xx n8 0. 889 3 M8 1. 024 3 I6 1. 139 9 L8

0. 556 9 Q8 0. 900 3 N9 5H4 «Ij 1. 027 B N10 1. 141 9 o12

0. 571 7 m9

9 K6 1. 033 3 H5 ®M9 1. 143 3 I76 Qi. 7i«

0. 583 9i3 0. 902 ®n9 1. 036 ®l7 xx o10 1. 145 7 M10

0. 589 xx 07 0. 905 5 Kfl 1. 038 7Qi2 1. 150 «g4

0. 600 *1* 9 K4 0. 906 7 N„ 1. 042 bl8 1. 153 bk8

0. 625 7 N7 “Q8 0. 909 3 O10 1. 045 7 On 1. 154 b 013

xx Q13

0. 633 9 l5 0. 911 bl7 1. 050 3 G4

7Hi 1. 157 7Ql4

0. 667 «f2

5 K57 08 0. 917 3 Qu 5 G3 3 M8 1. 054 ®K7 1. 159 9 N„

9H2 »m6 0. 927 5 O10 nQio 1. 055 7N10 1. 167 3 D2

3 H8 ®Nj2

0. 696 9 N7 0. 932 5 Qu 1. 056 “N9

7 G37L9

11 M9

0. 700 7 Q9 0. 933 n09 1. 064 9 Ql2 1. 170 7o13

0. 714 5l6 0. 944 17 N8 1. 067 7 M9 xx K5 1. 173 xx o12

0. 722 9 o8 0. 950 9l4 1. 071 bi6

9 Ke 1. 176 9Ql4
XXV

Table 3. Land£ 0-values—Teems of Odd Multiplicity in Order of Increasing g—Continued

9 Desig. 9 Desig. 9 Desig. 9 Desig.

1. 179 SI7

9 K7 1. 268 UK7 “Q16 1. 381 9H6 1. 625 “Fg

1. 182 5 Mn 8 M10 1. 273 *LU

n M„ 1. 382 UK10 1. 633 9 FS

1. 186 7N12 1. 276 9 Mi2 1. 385 nLi3 1. 650 7 d4

1. 191 uK6 1. 280 un13 1. 393 UI7 1. 661 “F7

1. 192 fi 013 1. 286 3 H7

7H6 ®Nl4 1. 400 5F5 »i10 1. 667 5 P3

9 Dg “Gs

1. 194 7k8 1. 288 no15 1. 402 nKn 1. 700 «f4

1. 197 nN„ 1. 292 7 I8 1. 405 7 Ge 1. 714 “D7 “F6

1. 200 3 Gs 5Lio 7H5 1. 294 nQl7 1. 411 9H7 1. 733 «d5

7Ql5 Ul4 UQl4 1. 300 7 G4

7K10

9 K8 1. 417 “Is nK12 1. 750 7 P4

7 D3 “G4

1. 201 9 Lfl nI5 1. 429 7 G7 1. 786 “D9

1. 205 7 M,i 1. 303 9 Ln 1. 431 9Hg 1. 800 ®p5

ix f6

1. 208 “L8 1. 304 9I7 1. 433 X1I9 1. 833 ®P2

9 F3 “P6

1. 212 9 N12 1. 308 9 M13 “Mi2 1. 444 9 H9 1. 850 9 d4

1. 214 5H6

7 Oi4 1. 309 uLio 1. 445 xlIio 1. 900 xi d5

1. 217 9 Ql5 1. 310 “N14 1. 455 UIn 1. 917 7P3 “G3

1. 220 uo13 1. 312 “016 1. 500 3P2

3 Pj ®D4 1. 950 9 P4 “F4

1. 222 6 K„ 1. 319 “Kg «D3

5 D25Di 1. 967 1X P6

1. 227 7 Ljo nMio 1. 333 3 D3

5 g67i97 F67F67f4 2. 000 3 Si ®S2

7 S3

1. 231 7 N13 «h5 «l12 “N1S

7F37F27Fi 9 S4 “S6

7 D2

1. 232 7I7 1. 335 “Mj3

9 G89 G7 9 G6 2. 083 9 D3

1. 233 fl 014 1. 336 9 K10

9 Gs9 G49 G3 2. 100 “D4

1. 235 9 MU 1. 339 7H7

9 G29 Gj X1H10 2. 167 «f2

1. 238 B Ie nQi5 1. 341 11 L11 uH9 uH8 nH7 2. 200 1X P4

1. 244 “Nu 1. 347 #I8

X1H6 “H5 “H* 2. 250 «P3 “F3

1. 250 3 F4

5F3 ®Ig 1. 350 5 F4 “H3 “Ha “Hi 2. 333 7 P2 “G2

7 M12

9H4

9 K8 1. 356 “K9 1. 556 “G9 2. 500 5Pi “D3

9 Ql6 1. 357 “i# “m14 1. 569 11 Gg 2. 667 9 d2

1. 253 9 N13 1. 364 9 K„ 1. 571 9F7 3. 000 7 Di “Fa

1. 256 7k8 1. 365 nLi2 1. 589 x1 G7 3. 500 9 Fj

1. 257 u014 1. 367 7 GS 1. 595 9 F6 4. 000 “Gi

1. 264 9 Ljo 1. 375 7H8 1. 600 7D6

1. 267 5 GS

9 Ois “1* 1. 378 eI9 1. 619 x1 G6
XXVI

Table 4. Land£ ^-values for Terms of Even Multiplicity in Order of Increasing g

9 Desig. 9 Desig. 9 Desig. 9 Desig.

-2. 000 10Hh 0. 713 8 Lsh 0. 937 8 K6H 1. 059 2 L8k

8 L7^

-1. 333 8 G* 0. 727 4l4H 0. 941 2 L7h 1. 060 4 Nio^

-0. 800 10 IiK 0. 737 6 Osh 0. 947 2 M8H 1. 063 10 K5h

-0. 667 «fh 0. 738 8 Mfl ^ 0. 952 2 n9*

i°I3H 1. 064 6 Qi2K

-0. 400 8 H^ 0. 761 8 N7* 0. 957 2 Oioh 10Qioh 1. 067 2 K7^

6Fi«

-0. 286 10 K2H 0. 762 6 Qoh 0. 960 2 Qhh 1. 068 4 m9H

0. 000 4 Dh

6 Gi« 8I2« 0. 769 4 K6* 0. 962 10 O9* 1. 071 6H4H 8 Ox*

10 L3* 0. 780 8 Osh 0. 964 4 K6* 1. 073 10 n9H

0. 182 0. 797 s Qw 0. 965 4 I5h

4 L7^ 1. 077 2 Ish 4 L8*

0. 222 8 K3H 0. 800 2 Di^ 4 L6h

10H,x 0. 966 4 m8* 1. 081 6 Ni0i^

0. 286 6H2* 0. 824 4 m7H 0. 967 4 n9* 1. 084 8 Ql2H

0. 308 10 N5H 0. 825 6h3* 0. 969 4 Oioh 1. 087 8 k6H

0. 364 8 l4* 0. 828 6l4H 0. 970 4 H4^

4 Qhh 8I4h 1. 090 4 Kw

0. 400 4 Fi^ 10Oe}4 0. 831 10 M6M

ion7H 0. 972 10 n8* 1. 091 2HS*

0. 444 ®I3H 0. 836 10O8^ 0. 984 4 G3h 1. 093 6 M9H

0. 462 8 M6* 0. 839 6 K5H

io l5^ 0. 988 ®QiiH 10 MW 1. 096 8 Ohh 10 M8H

0. 471 10 Q:k 0. 842 4 Nsh 10Qs»* 0. 990 6 Oxoh 1. 108 4Ie^ 6 L8^

0. 508 10 k3H 0. 851 0. 992 6 n9* 1. 110 8 Nio^

0. 514 10 I2h 0. 857 2 F2H

4 09>*6 g2^ 0. 997 6 m8* 1. Ill 2 G4>44 Qi3H10Ql2H

0. 533 8 N6h 0. 863 6 m7H 1. 004 6 L7H 1. 120 4 0l2H

0. 545 6 K4h

10L4H 0. 869 1. 012 8 Qn« 1. 124 6 Ql3H

0. 571 4 G2** 0. 870 4 Qioh 1. 015 6 K6H

10 L6H 1. 127 10O„*

0. 587 10 Ms* 0. 873 6 n8* 1. 019 8 Oioh 1. 128 8 M9H

0. 588 8 Ow 0. 882 ®09^ 1. 028 8 n9* 1. 129 «k7H

io l7^

0. 615 6L«h 0. 889 2 g3* 1. 029 4 F2h | 1. 130 4 Nn^

0. 626 10 n6* 0. 890 6 Qio« 1. 035 6Ibh 1. 133 4H5 *

8Is>*

0. 632 8 Qsh 0. 909 2 h4H 1. 040 2 Qi2H 8 MW 1. 135 6 0l2^

0. 659 10 O7* 0. 916 8 n8* 1. 043 2 Oll^ 10 QllH 1. 142 8 Ql3H

0. 667 2 P>$ 4h3*

6 M6H 0. 917 8 09h 1. 048 2 Nio^ 8H3* 1. 143 2 F3H

4 Mioh 6 G3j^

8 l3« 0. 918 8 m7* 1. 049 4 Qi2« 1. 147 10 N10>*

0. 686 8 h2 * 0. 919 8 Qioh 1. 053 2 m9H 1. 148 6 Nn^

0. 687 8 K4ya 10Qsh 0. 923 2 I5h

8L6j< 1. 054 4 Ohh 1. 152 8 L8h

10Dh

0. 706 6NW 0. 933 2 K6h

8 Gi^ 1. 056 10O10* 1. 156 8 o12*
XXVII

Table 4. Lande ^-values foe Teems of Even Multiplicity in Oedee of Inceeasing g—Continued

g Desig. 9 Desig. 9 Desig. 9 Desig.

1. 158 4D»h 1. 255 10K7H 1. 394 10H4K 1. 714 6 P3h

8 f2H

1. 159 6Ie* 1. 257 8 G2 * 1. 397 6 f3* 1. 733 4 Pih

1. 164 6 Mio* 1. 259 8 Ni3^ 10 Is^ 1. 412 8h8* 1. 758 10F4h

1. 165 WQl3H 1. 261 10 Oj4H 1. 414 8 G4h

10I«4 1. 762 10 d5*

1. 172 4 G4H 6 Ql4H 8NllH 1. 263 6K9H

iol9* 1. 427 10h5H 1. 772 10 G2h

1. 173 10 m9* 1. 267 8 Lioh 1. 429 4 D3H 10 Iioh 1. 778 8 P4*

1. 176 4 k8* 1. 273 4 Gq3^ 6 G4h 10 M„h 1. 434 6F4H 1. 809 8 D3h

1. 179 10 K8H 10 Ql6H 1. 441 8 G5h 1. 818 lfl P5*

1. 182 10 Ol2H 1. 280 8 m12* 1. 446 10h6* 1. 867 6 Di^

1. 183 1. 282 6H6H

10N13^ 1. 455 6F5h 1. 879 1q D4H

1. 184 8 k7* 1. 290 10 O15H 1. 456 8 g6* 1. 886 6p2*

1. 185 6 0l3H 1. 294 6I8H

8l7« 1. 459 10h7* 1. 905 10f3H

1. 188 8 Ql4H 1. 298 8 K9* 1. 467 8 g7^

ioh8^ 1. 937 8Ps*

1. 193 8 M10j* 1. 301 8h5H 1. 474 10h9H 1. 960 10P*h

1. 200 2 D2h 1. 304 8 Diih 10Dioh 1. 529 10 G8* 2. 000 2 Sh 4 Si* eS2 *

6 N12j^4 °h2* 1. 307 10 k8*io m12H 1. 537 10 G7*

8 S3h

8Fi^ 10S4«

1. 203 6H5H

SOl3H 10Nll}4 1. 310 10 n14H 1. 538 8F6* 2. 057 8 D2*

1. 207 6 K8H i°L8^ 1. 314 6F2* 1. 549 10 G6* 2. 095 10d3*

1. 208 10 Ql4H 1. 323 10l6H 1. 552 8Fs* 2. 133 10 Gih

1. 212 8H*H 1. 333 2 Pih 4F4h 6H7h 1. 556 6 D4H 2. 222 10P3*

1. 217 6 Mn^ 8 k10H

10h3*

io m13H 1. 566 10 G5h 2. 229 10F2H

1. 218 8 LgH 1. 336 10Liih 1. 576 8 F4H 2. 286 8 p2*

1. 221 8 n12* 1. 337 8l8K 1. 587 6 D3* 2. 400 6Pi*

1. 226 S Ql5H 10 Ol3H 1. 343 6 G5h

1q K9H 1. 596 10 G4M 2. 572 10D2H

1. 230 10 Mioh 1. 354 8 H6h 1. 600 4 P2 h

10F7 « 2. 667 4 P*

1. 231 4H6h

8Ibh 1. 360 10Ll2H 1. 619 8Fsh 2. 800 8 D1h

1. 238 4 F3*

6Lioh 1. 365 8 G3*

whH 1. 631 10f6* 3. 200 10Fih

1. 239 6 Ith 1. 368 8hx 1. 636 8 D5H 3. 333 6 D*

1. 241 8 0l4^ 1. 371 4 D2H

10 K1oh 1. 651 10 G3 h 4. 000 8Fh

1. 242 8 Mn^ 1. 385 6 G6* 1. 657 6 D2H 4. 667 10 G«

1. 243 10 Ql5« 1. 388 8h7* 1. 678 10F5h

1. 247 10 n12H 1. 391 10 Kn^ 1. 692 10Dsh

1. 251 8 K8H 1. 393 10l8H 1. 697 8 D4h
XXVIII

Table 5. Predicted Terms of the Bei Isoelectronic Sequence

Config.

1 s

2 +

1

] Predicted Terms

2s2

2s(2 S)2p

2p

2

2s(2 S)nx

2p(2 P°)nx

J S

/

3 P°

t >P°

/

3 P

VS

ns (n>3

)

np (n>3) nd (n> 3) nf (n>4) ng (n> 5)

/

3 S vs

r 3 P°

\ ip°

3p°

ipo

3 S3 P 3 D

!S *P *D

3 D

iD

3 P° 3 D° 3 F°

ip° i D° ipo

3po

ip°

3 D 3 F 3 G

iD !F iG

3 G

J G

3 F° 3 G° 3 H°

iF° iG° >H°

Table 6. Predicted Terms of the Bi Isoelectronic Sequence

Config.

ls2 +

Predicted Terms

2s2 0S)2p

2s 2p

2

2p

3

2po

I 4P VS 2P 2 D

f

4S°

i 2p° 2J)0

ns (n> 3) np (n> 3) nd (n> 3)

2s2 0S)nx 2 S

2 po 2 D

/

4 P° 4 S

4 P 4 D

4po 4T)° 4^0

2s 2p(3 P°)nx

\

2 P° 2 S 2 P 2 D 2po 2J)o 2 p°

2s 2p(1 P°)nx' 2 po 2 S 2 P 2 D

2po 2 p>° 2p°

r

4P 4 S° 4 P° 4 D° 4P 4 D 4 F

2p2

(

3 P)nx"

|

2P 2 go 2p° % 2J)° 2p 2 D 2 F

2p2

(

1 D)nx"/ 2 D 2 P° 2 D° 2 F° 2 S

2 P 2 D 2F 2 G

2p2

(

1 S)nzIV 2 S

2 po 2 D

nf (n>4) ng (n> 5)

2s2 OS) fix 2p° 2 G

r

4 D 4 F 4 G

4po ido 4H°

2s 2p(3 P°)nx

\

2 D 2 F 2 G 2F° 2 G° 2H°

2s 2pOP°)nz' 2 D 2 F 2 G 2po 2Q° 2JJO

j

ij)0 i-po 4QO 4 F 4 G 4 H

2p2

(3 P)nx

I 2P)° 2po 2QO 2 F 2 G 2 H

2p2 0D)nz"' 2 P° 2 D° 2 F° 2 G° 2 H° 2 D 2F 2 G 2 H 2 I 2p2 0S)nxIV 2p° 2 G
XXIX

Table 7.

Predicted Terms of the Ci Isoelectronic Sequence

Config.

1 s

2 +

Predicted Terms

2s2 2

p

2

2s 2p3

2p

4

2s2 2p(2 P°)ra

2s 2p2

(

4 P)nx

2s 2p2

(2 D)nx'

2s 2p2

(

2 S)nx"

2s 2p2

(

2 P)nx'"

2p3

(4 S°)nxIV

l

J S

5gc 3gc

3 P

ID

3p° 3][)< ip° id=

3 P

PS iD

ns (n>3) np ( n>3) nd (n>3) nf (n> 4)

/ 3po 3 S

3 P 3 D 3p° 3 D° 3p° 3 D 3 F 3 G

\ :po IS iP 4 D ipo iD° ip° iD iF 4 G

sp 5S° 5p° 5D° SP sD sp 5D° 5p° 5G°

i sp 3 S° 3p° 3 D° 3 P 3 D 3 F 3 D° 3p° 3 G°

/

3 D 3p° 3 D° 3p° 3 S

sp 3 D 3 F 3 G 3p° 3 D° 3p° 3 G° 3 H°

\ iD ipo iD° ipo 4 S

4 P iD ip J G ipo >D° ip° >G° 1 H°

/

3 S3p° 3 D 3p° vs ipo iD ipo

r

3 P 3 S° 3p° 3 D° 3 p 3 D 3 F 3 D° 3p° 3 G°

i iP 1 S

° ipo iD° IP *D iF iD° ipo 1 G°

f 5S° 5P 5D° 5F

\

3 S° 3 P 3 D° sp

Table 8. Predicted Terms of the N i Isoelectronic Sequence

Config.

ls2 +

Predicted Terms

2s2 2p3

2s 2p4

2p5

2s2 2p2

(

3 P)nz

2s2 2p2

(

1 D)nx'

2s2 2p2

(

1 S)nx"

2s 2p3 (

5 S

0 )na;

, "

2s 2p3

(

3 D°)nxIV

2s 2p3

(

3 P°)nzv

f 4 S

c 2 P° 2 DC

f

4 P

[2 S 2 P 2 D

2po

ns (n>3) np (n>3) nd (n> 3) nf (n>4)

I

* P 4 S° 4 po 4 D° 4 P 4 D 4 F 4 D° 4pO 4 G°

l

2 P 2 S° 2p° 2 D° 2 p 2 D 2 F 2 D° 2p° 2 G°

2 D 2 po 2 D° 2p° 2 S2 P 2 D 2 F 2 G 2 po 2 D° 2p° 2 G° 2H°

2 S 2 po 2 D 2p°

r«s° «P 6D° ®F

\

4 S° 4 P 4 D° 4 F

f

4 D° 4 P 4 D 4 F 4 S° 4 po 4 D° 4p° 4 G° 4 P 4 D 4 F 4 G 4 H

X

2 D° 2 p 2 D 2 F 2 S° 2p° 2 D° 2p° 2 G° 2 P 2 D 2 F 2 G 2 H

/

4 P° 4 S

4 P 4 D 4 po 4 D° 4p° 4 D 4 F 4 G

\

2 p° 2 S2 P 2 D 2po 2 D° 2p° 2 D 2F 2 G
Table 9. Predicted Terms of the O i Isoelectronic Sequence

Config.

1 s

2 +

Predicted Terms

2s2 2

p

4 {

J S

3 P

ID

2s 2

p

5 {

3p°

ipo

ns (n> 3) np (n>3) nd (n> 3)

2s2 2p3

(

4 S°)na; oo «p*p

6D°

3 D°

2s2 2p3

(2 D°)nx' /

3 D° ap 3D *F 3 S° apo 3 D° apo 3 G°

i iD° IP iD ip J S° ipo iD° ip° 1 G°

2s2 2p3 (

2P°) ru;"

f

3 po 3 Sap 3D 3p° 3 D° 3F°

i ipo 3 S IP iD ipo iD° iF° «P ®s° epo 6D° 5P 6 D ap

2s 2p4 (

4 P)nx

{ »p 3 S° apo *D° ap 3 D *F

2s 2p4 (

2D)nxly r 3 D apo 3 D° ap° 3 S ap 3 D a F 3 G

I iD ipo iD° iF° IS IP iD IF *G

2s 2p4 (

2S)m;v f

3 S

vs

apo

ipo

3 D

iD

2s 2p4 (2P)nxyl

{

sp

IP

3 S°

1S° apo

ipo

3 D°

iD°

ap

3 P

3 D

3 D

»F

ip

nf (n>4)

2s2 2p3 (

4 S°)»w;

{ *F

3 F

2s2 2p3 (

2 D°)nz'

rap VP3 D

3 D

ap

ip

3 G

iG

*H

m

2s2 2p3

(

2P°)nz"

{

3D

*D

3F

ip

3G

3 G

2s 2p4 (

4P)nx'"

{

«D°

3D°

5F°

3F°

®G°

*G°

2s 2p4 (

2D)nxIV J

3 P°

VP°

8D°

iD°

ap°

iF°

3G°

iG°

3H°

iH°

2s 2p4

(

2S)nxy {

3F°

ip0

2s2p4 (

2 P)nxVI {

»D°

iD°

ap0 iF°

3 G°

iG°
Table 10. Predicted Terms of the Fi Isoelectronic Sequence

Config.

1 s

2 +

2s2 2p5 2 po

Predicted Terms

2s 2

p

6 2 S

ns (n> 3) np (n> 3) nd (n>3)

r

4 P 4 S° 4 po 4 D° 4 P 4 D 4 F

2s2 2pi (

i P)nx

I ap 2 S° 2 po 2D° 2 P 2 D 2p

2s2 2p4 (

1 D)nx' 2 D 2 p° 2 D° 2 F° ag ap 2 D 2 F 2 G

2s2 2pi (

1 S)nx" 2 S

2 po 2 D

/

4 po 4 S

4 P 4 D 4 po 4 D° 4p°

2s 2ps

(

i F°)nx'"

{

2 po 2 S ap 2 D 2 po 2D° 2 po

nf (n> 4)

2s2 2pi (

l F)nx /

4 D°

\

2 D°

o

o

4 G

2 G

2s2 2pi ('T>)nx' to do 0o 2p° 2 G

2s2 2p4

(

1 S)n3" 2po

2s 2p5 (fP

0)nx, " r

4 D

\

2 D

4 F

2 F

4 G

2 G

Table 11. Predicted Levels of the Nei Isoelectronic Sequence

Config.

ls2 +

Predicted Terms

2s2 2p«

2s2 2p5

(

2P°)nx

2s 2p8

(2S)nx

»S

ns (n>3) np (n> 3) nd (n> 3) nf (n> 4)

/

3 P° ss ap a D 3 P° 3 D° 3 F° 3D *F *G

1

2 P° ! S3 P 4 D ip° id 0 iF° iD iF iG

VS jpo 3 D 3p°

vs ipo iD ipo

jZ-Coupling Notation

Config.

Is2 2s2+ Predicted Pairs

2p5

(

3 PlH)nx

2ps (*P%)nz'

(n>3) np (n>3) nd (n> 3) nf (n>4)

im° [ HI [ Va]° [134] [234] [334]° [434] [134] [l 34]° [234] . [2K]° [334]

[ xi° [134] [234]° [3/2]

[ Yi\ [134]° [2/2 ]
XXXII

Table 12. Predicted Terms of the Mg i Isoelectronic Sequence

Config.

Is2 2s2 2

p

8 +

Predicted Terms

3s2

3s(2 S)3p

3p

2

3s(2 S)nx

3p(2 P°)nx

3s(2S)nx

3p(2 P°)nx

<

iS

3 P°

ip° sp OS ID

ns (n> 4) np (n>4) nd (n> 3)

1

f 3S

OS

3P°

1P°

3p°

ip°

3 S3 P 3 D

iS iP iD

3 D

iD

3 P° 3 D° 3 F°

ip° ip>° ip°

nj (n>4) ng (n>5) nh (n> 6)

1

1

3 F

° ip°

OD 3 F 3 G

OD iF iG

3 G

iG

3 F° 3QO 3jjo

jpo 1QO 1JJO

3 H°

»H°

3 G 3 H 3 I iG iH il

Table 13. Predicted Terms of the All Isoelectronic Sequence

Config.

Is2 2s2 2p

6 +

Predicted Terms

3s2 OS) 3p

3s 3p

2

3p

3

3s2 0S)nx

3s 3p(3 P°)nx

3s 3pi}P°)nx'

t2S

osc

2pc

4 P

2 p

2pc

2 D

2 D‘

ns (n>4) np (n>4) nd (n> 3) nj (to >4) ng (n>5)

2 S 2p° 2 D 2 po 2 G

f

4 P° 4 S4 P 4 D 4 po 4 D° 4 F

° 4 D 4 F 4 G 4 F

0 4 G° 4 H°

\

2 P° 2 S 2 p 2 D 2p° 2D° 2 po 2 D 2 po 2 G 2 po 2 G° 2 H°

2p° 2 S 2 p 2 D 2 po 2 D° 2 po 2 D 2 p 2 G

2po 2 G° 2 H°
XXXIII

Table 14. Predicted Terms of the Si t Isoelectronic Sequence

Config.

Is2 2s2 2

p

a +

3s2 3p

2 {«

sp ID

f ®S° 3s 3

p

3 3 S° 3po 3 D

l ipo iD

3p4 {‘S

3p

4 D

Predicted Terms

3s2 3p(2 P°)nx

3s 3p2

(4P)nx

ns (n> 4) np (w>4) nd (n> 3) nf (n>4)

f

3 P° 3 S

sp 3 D 3p° 3 D° 3p° 3 D 3 F 3 G

\

4 P° is ip *D ipo iD° ip° iD iF *G

/ ®P «s° 5p° «D° 5P 6 D ®F sd° Spo S G°

\

3 P 3g° 3p° 3D° 3p 3 D 3 F 3 D° 3po 3 G°

Table 15. Predicted Terms of the P 1 Isoelectronic Sequence

Config.

Is2 2s2 2p6 +

Predicted Terms

3s2 3p3

3s 3p4

3p5

f

4 S°

1 2p° 2J)0

/

4 P

\

2 S2 P 2 D

2p°

ns (n> 4) np (n>4) nd (n> 3) nf (ft >4)

/

4 P 4g° 4po 4J-JO 4p 4 D 4 F 4 D° 4 F° 4 G°

3s2 3p2

(

3 P)nx

\

2 P 2g° 2p° 2J)0 2P 2 D 2 F 2 D° 2 F° 2G°

3s2 3p2

(

4 D)nx' 2 D 2P° 2 D° 2 F° 2 S

2 P 2 D 2 F 2 G 2 P° 2D° 2 F° 2 G° 2H°

3s2 3p2 (

1 S)nx" 2 S 2p° 2 D 2 p°
XXXIV

Table 16. Predicted Terms of the S i Isoelectronic Sequence

Config.

Is2 2s2 2p*+ Predicted Terms

3s2 3p* {‘S

3 p

iD

3s 3p

6 {

apo

ipo

ns (n> 4) np (n> 4) nd (n>3) nf (n> 41

3s2 3p3

(4S°)nz rss° 6 P 5D° 6F

\

3 S° 3P 3D° 3 F

3s2 3pz (?D°)nx' f

3D° 3 P 3 D 3F 3 S° 3po 3 D° 3po 3 G° 3P 3 D *F 3 G

X iD° J P iD ip 1 S° ipo iD° iF° J G° J P iD iF iG »H

3s2 3p3

(2H

>0)nx" f 3po 3 S 3 P 3 D 3p° 3 D° 3p° 3 D 3 F 3 G

1 ipo 4 S iP iD ipo iD° IF0 4 D iF »G

3s 3pi (fY)nx"'

sP «s° spo 5 D° ®P 5D 6 F 6D° 5p° 5 G°

i

3 P 3 S° apo 3D° 3P 3 D 3 F 3 D° 3F° 3 G°

3s 3p*(?T))nxlv /

3 D 3po 3D° 3p° 3 S

3 P 3 D 3 F 3 G apo 3 D° 3F° 3 G° S H°

\ *D ipo iD° ipo »S J P iD iF J G ipo iD° ip0 ! G° 1 H°

3s 3pi (?S)nxv /

3 S 3p° 3 D 3po vs ipo *D iF°

3s 3p4

(

2 P)nxVI /

3 P 3 S° 3p° 3D° 3 P 3 D 3 F 3 D° 3p° 3 G°

i *P 1 S

° ipo iD° IP iD iF iD° ip° iG°

3ps

(2P°)nxvn r apo 3 S

3 P 3 D 3p° 3 D° 3p° 3 D 3 F 3 G

i jpo J S !P »D ipo iD° ip0 iD ip >G

Table 17. Predicted Terms of the Cl i Isoelectronic Sequence

Config.

Is2 2s2 2p«+ Predicted Terms

3s2 3p5 2 po

3s 3p® 2 S

ns (n>4) np (n>4) nd (n> 3) nf (n>4)

3s2 3p4

(

3 P)nx 1 4 P 4 S° 4 P° 4 D° 4P 4 D 4 F 4J)0 4po 4QO

1 2P

2gO 2pO 2J)0 2p 2J) 2p 2 D° 2F° 2 G°

3s2 3pi (

1 T>)nx' 2D 2P° 2D° 2F° 2 S 2P 2 D 2 F 2 G 2pO 2J)0 2p° 2QO 2JJO

3s2 3pA

(

l S)nx'' 2 S 2po 2D 2po

1 4P° 4 S

4 P 4 D 4 P° 4D° 4 F° 4 D 4 F 4 G os 6p\Ar yrtx

1 2P° 2 S

2P 2D 2p° 2J)° 2p° 2D 2 F 2 G
XXXV

Table 18. Predicted Levels of the Ai Isoelectronic Sequence

Config.

Is2 2s2 2p8 +

Predicted Terms

3s2 3p8 *S

ns (n> 4) np (n>4) nd (

n

> 3) nf (n> 4)

3s2 3p

5

(2 P°)tkc

r 3 P° 3S 3p 3D 3P° 3D° 3TT° 3D 3p 3Q

{ ip0 IS !P !D ip° IT) 0 1 F0 ID IF 1G

3s 3pB

(2S)nx /

3 S

3po 3 D 3po vs ipo ID ipo

jZ-Coupling Notation

Config.

Is2 2s2 2

p

6 3s2 +

Predicted Pairs

ns (n> 4) np (n> 4) nd (n > 3) nf (n > 4)

3pB (

2 P!^)nx [ m° [ V] [ y2]° [334]°

[134]° [234]°

[2y2 ]° [134]°

[134] \m

[234] [3y2]

[ 3/2] im

im

[134]

3p8

(

2 P&)nx' [ h]° im

[ hi

Table 19. Predicted Terms of the Ca i Isoelectronic Sequence

Config.

Is2 2s2 2

p

6 3s2 3p8 +

4s

2

3d2

4p

2

4s(2 S)w£

3d(2 D)?u;'

4p(2P

0)^w;

,,

4s(2S)nx

3d(2 D)nx'

4p(2P

0)7uc"

Predicted Terms

iS

f 3P 3F

[iS *D iG

r sp

PS *D

ns ( n> 4) np (n> 4) nd (n> 3)

f 3 S 3p° 3 D

l

x s

ipo iD

3 D Spo 3 D° 3po 3 S

3 P 3 D 3 F 3 G

X D ip° id° iF° *S iP iD iF J G

3p° 3 S

3 P 3 D 3 po 3D° spo

ipo J S !P iD ipo iD° 1 F°

nf (ji> 4) ng ( n> 5)

3 F° 3 G

ip° iG

ppo 3D° 3p° 3QO 3JJ° 3 D 3 F 3 G 3 H 3 I ipo id° ipo 1 QO ijjo iD if ig m »i

3 D 3 F 3 G 3F° 3 G° 3H°

!D IF *G ipo 1QO IJJO
XXXVI

Table 20. Predicted Terms of the Sc i Isoelectronic Sequence

Config.

Is2 2s2 2p

6 3s2 3pfl +

3d 4s2

3d3

3d 4s(3 D)wz

3d 4s (

3 D)?^

3d2

(3 F)na;

3d2 i}T))nx

3d2 (}S)nx

3d2 (

3 P) nx

3d2 (}G)nx

4p2

(

3 P)wa;

3d 4s(3 D)ra:

3d 4s(1 D)na;

3d2

(

3 F)nx

3d2 (

1 D)wx

3d2 (

1 S)nx

3d2

(3 P)na;

3d2

(

3 G)wx

4p2

(3 P)wx

Predicted Terms

({

4 P

2 P

2 D

2 D

2 D

4J

1

2 F 2 G 2 H

ns (n> 4) np (n> 4)

f

4 D 4 P° 4 D° 4 F°

\

2 D 2 P° 2 d° 2p°

2 D 2 P° 2 d° 2p°

f

4 F 4 D° 4 F° 4 G°

\

2 F 2 D° spo 2 qo

2 D 0o 0o O

2 S

2po

/

4 P 4g° 4p° 4D°

\

2 P 2g° 2 p° 2D°

2 G 2 F° 2 G° 2 H°

r

4 P 4 S° 4 P° 4 D°

\

2 P

2gO 2 po 2D°

nd (n> 3) nf (n> 4)

f 4 S

4 P 4 D 4 F 4Q 4 P° 4 D° 4 F° 4 G° 4 H°

\

2 S 2 P 2 D 2 F 2 G 2 p° 2D° 2po 2QO 2JJO

2 S

2 P 2 D 2 F 2 G 2 P° 2D° 2 F

° 2Q° 2JJO

J

4 P 4 D 4 F 4 G 4 H 4 D° 4 F° 4 G° 4 H° 4 I° \

2 P 2 D 2 F 2 G 2 H 2 D0 2 F° 2Q° 2JJO 2J°

2 S2 P 2 D 2 F 2 G 2 P° 2D° 2 p° 2QO 2JJO

2 D 2 po

/ 4p 4J) 4 F 4 D° 4 F° 4 G°

\

2 P 2J) 2 p 2 D° 2 F° 2 G

°

2 D 2 F 2 G 2H 2 I

2 F° 2 G° 2H° 2 I° 2 K°

f 4 P

4 D 4 F 4 D° 4 F° 4 G°

\ 2p 2D 2p 2 D° 2 F° 2 G°
Table

21.

Predicted

Terms

of

the

Tii

Isoelectronic

Sequence

XXXVII
XXXVIII Ho

fcWaH

OQHa&bO

ccS

PSHHQH

EhOMaH

PS PM

<N<NH

HI«

«s

<u H

T3

a> £ W

W 0 OOO OOO

Ph Ph Ph Ph Ph Ph Ph Ph

<0 d * * * 99 QflflQ PPP

PhPh

-J* d

PM Ph

*• d

Oh Ph Oh

m

m mmm

v ?* ^ ; •1— c1CO

Cla

TfH %

»o % CO CO CO

Al

'es

AlaS

T}H AlS

MM

MW MW MM MMCM 00 OO0 ^ OO OO OO'T Cl

pH Ph O T' Ph Ph Ph Ph Ph Ph Ph Ph Ph Ph

Qfl QQ OQ QQ'f Cl PP^ Cl

Ph Ph Ph Ph Ph Ph PH Ph Ph Ph mm o o MW O O OOCD T 0 0 00*»> Cl O O OO O O OO O O Ph Ph O O 9 0 0 Ph Ph 0 0 Ph Ph O O PP 0 0 PP O O PP-»r d O O PPd O O PP o o Ph PM o o PhPh

MW

pHpH pHpH pH P>H PP

PhPh

<D+ACO

ta po c ® o a 0 <M

'05 <M

'«CO

Ph Ph

10 ,

s

h-h' ^

s

CO CO Ph HH Ph

Tti rJH % % % % %

CO CO CO CO CO
XXXIX

T30) X!

a> 'd

a> tp-g ^ 'S

«*-c a> o £Ph

03 +? «

3 ft S >> H -4J >>.2

ft s

8 §
XL

Table 23. The Chemical Elements—Ionization Potentials*

z Element Symbol I. P. Ground State z Element Symbol I. P. Ground State

1 Hydrogen H 13. 595 Is 2 S* 36 Krypton Kr 13. 996 (4s2 4p

6

) ‘So 2 Helium He 24. 580 (Is2

) ‘S0 37 Rubidium Rb 4. 176 5s 2 S*

3 Lithium Li 5. 390 2s 2s* 38 Strontium Sr 5. 692 5s2 ‘So 4 Beryllium Be 9. 320 2s2 ‘S0 39 Yttrium Y 6. 6 4d 5s2 2 D1H 5 Boron B 8. 296 2s2 2V

2 P* 40 Zirconium Zr 6. 95 4d2 5s2 3 f2 6 Carbon C 11. 264 2s2 2p2 3 Po 41 Columbium Cb 6. 77 4d4 5s 8Dh

7 Nitrogen N 14. 54 2s2 2p3 4 Si* 42 Molybdenum Mo 7. 18 4d5 5s 7 s3 8 Oxygen 0 13. 614 2s2 2p* 3 P2 43 Technetium Tc 4d5 5s2 es2 ^

9 Fluorine F 17. 42 2s2 2p

8 2 pr* 44 Ruthenium Ru 7. 5 4cP 5s 5F5 10 Neon Ne 21. 559 (2s2 2p

6

) ‘S0 45 Rhodium Rh 7. 7 4d8 5s 4 F4*

11 Sodium Na 5. 138 3s 2 S* 46 Palladium Pd 8. 33 4d10 ‘So 12 Magnesium Mg 7. 644 3s2 ‘S0 47 Silver Ag 7. 574 5s 2Sh

13 Aluminum A1 5. 984 3s2 3P

2 P£ 48 Cadmium Cd 8. 991 5s2 ‘So 14 Silicon Si 8. 149 3s2 3p

2 3 Po 49 Indium In 5. 785 5s2 5p

2 PA

15 Phosphorus P 11. 0 3s2 3p

3 4 SfH 50 Tin Sn 7. 332 5s2 5p

2 3 Po

16 Sulfur S 10. 357 3s2 3p* 3 P2 51 Antimony Sb 8. 64 5s2 5p

3 4 Six

17 Chlorine Cl 13. 01 3s2 3p

5 2 P?X 52 Tellurium Te 9. 01 5s2 5p* 3 P2 18 Argon A 15. 755 (3s2 3P

6 ) ‘So 53 Iodine I 10. 44 5s2 5p

5 2 P!h 19 Potassium K .4. 339 4s 2S* 54 Xenon Xe 12. 127 (5s2 5p8

) ‘So 20 Calcium Ca 6. Ill 4s2 >So 55 Cesium Cs 3. 893 6s 2S*

21 Scandium Sc 6. 56 3d 4s2 2 D,* 56 Barium Ba 5. 210 6s2 ‘So 22 Titanium Ti 6. 83 3d2 4s2 3F2 57 Lanthanum La 5. 61 5d 6s2 2D1M 23 Vanadium V 6. 74 3d3 4s2 4 Pi« 58 Cerium Ce (6. 91)

24 Chromium Cr 6. 76 3d5 4s 7 S3 59 Praseodymium Pr (5. 76)

25 Manganese Mn 7. 432 3d5 4s2 #S2H 60 Neodymium Nd (6.31) 4/ 4 6s2 6L

26 Iron Fe 7. 896 3d8 4s2 «d4 61 Prometheum Pm

27 Cobalt Co 7. 86 3d7 4s2 4 F4* 62 Samarium Sm 5. 6 4/ 8 6s2 7 F0 28 Nickel Ni 7. 633 3d8 4s2 3 F4 63 Europium Eu 5. 67 4f 6s2 8S§h

29 Copper Cu 7. 723 (3d10 ) 4s 2 s* 64 Gadolinium Gd 6. 16 45d 6s2

30 Zinc Zn 9. 391 4s2 ‘So 65 Terbium Tb (6. 74) 31 Gallium Ga 6. 00 4s2 4p

2P£ 66 Dysprosium Dy (6. 82)

32 Germanium Ge 8. 13 4s2 4p

2 3 Po 67 Holmium Ho

33 Arsenic As 10 ± 4s2 4p

3 4 Sfo 68 Erbium Er

34 Selenium Se 9. 750 4s2 4p* 3 P2 69 Thulium Tm 4/ 13 6sa 2 F§h

35 Bromine Br 11. 84 4sn 4p

5 2PiH 70 Ytterbium Yb 6. 2 (4/ 14) 6s2 ‘So
XLI

Table 23. The Chemical Elements—Ionization Potentials—Continued

z Element Symbol I. P. Ground State z Element Symbol I. P. Ground State

71 Lutecium Lu 5. 0 5d 6s2 2 D2* 88 Radium Ra 5. 277 7s2 iSo 72 Hafnium Hf 5. 5 ± 5d2 6s2 3 f2 89 Actinium Ac

73 Tantalum Ta 6 ± 5d

3 6s2 4 Fi^ 90 Thorium Th 6d2 7s2 3 F2 74 Tungsten W 7. 98 5d

4 6s2 5 D0 91 Protactinium Pa

75 Rhenium Re 7. 87 5d5 6s2 6S2* 92 Uranium U 4 ± 5/ 3 6d 7

s

3 *L° 76 Osmium Os 8. 7 5d

6 6s2 5 d4 93 Neptunium Np

77 Iridium Ir 9. 2 5d1 6s2 4 Fw 94 Plutonium Pu

78 Platinum Pt 8. 96 5d

9 6s 3 D3 95 Americium Am

79 Gold Au 9. 223 (5d 10) 6s 2 Sk 96 Curium Cm

80 Mercury Hg 10. 434 6s2 ‘So 97

81 Thallium T1 6. 106 6s

2 6p

2 P* 98

82 Lead Pb 7. 415 6s

2 6p2 3 Po 99

83 Bismuth Bi 8 ± 6s2 6p

3 4 S 100

84 Polonium Po 101 85 Astatine At 102 86 Radon Rn 10. 745 (6s2 6p

6

) ‘So 103 87 Francium Fa

* Parentheses denote values that have been determined experimentally, but not yet confirmed by series. Table 24. Chemical Symbols

Symbol Element Z Symbol Element Z Symbol Element Z Symbol Element Z

A Argon 18 Dy Dysprosium 66 Mn Manganese 25 S Sulfur 16 Ac Actinium 89 Er Erbium 68 Mo Molybdenum 42 Sb Antimony 51 Ag Silver 47 Eu Europium 63 N Nitrogen 7 Sc Scandium 21 Al Aluminum 13 F Fluorine 9 Na Sodium 11 Se Selenium 34

Am Americium 95 Fa Francium 87 Nd Neodymium 60 Si Silicon 14 As Arsenic 33 Fe Iron 26 Ne Neon 10 Sm Samarium 62

At Astatine 85 Ga Gallium 31 Ni Nickel 28 Sn Tin 50

Au Gold 79 Gd Gadolinium 64 Np Neptunium 93 Sr Strontium 38

B Boron 5 Ge Germanium 32 O Oxygen 8 Ta Tantalum 73

Ba Barium 56 H Hydrogen 1 1 Os Osmium 76 Tb Terbium 65

Be Beryllium 4 (D Deuterium) P Phosphorus 15 Tc Technetium 43

Bi Bismuth 83 (T Tritium) ] Pa Protactinium 91 Te Tellurium 52

Br Bromine 35 He Helium 2 Pb Lead 82 Th Thorium 90

C Carbon 6 Hf Hafnium 72 Pd Palladium 46 Ti Titanium 22

Ca Calcium 20 Hg Mercury 80 Pm Prometheum 61 T1 Thallium 81 Cb Columbium 41 Ho Holmium 67 Po Polonium 84 Tm Thulium 69

Cd Cadmium 48 I Iodine 53 Pr Praseodymium 59 U Uranium 92

Ce Cerium 58 In Indium 49 Pt Platinum 78 V Vanadium 23

Cl Chlorine 17 Ir Iridium 77 Pu Plutonium 94 W Tungsten 74 Cm Curium 96 K Potassium 19 Ra Radium 88 Xe Xenon 54

Co Cobalt 27 Kr Krypton 36 Rb Rubidium 37 Y Yttrium 39

Cr Chromium 24 La Lanthanum 57 Re Rhenium 75 Yb Ytterbium 70

Cs Cesium 55 Li Lithium 3 Rh Rhodium 45 Zn Zinc 30

Cu Copper 29 Lu Lutecium 71 Rn Radon 86 Zr Zirconium 40

Mg Magnesium 12 Ru Ruthenium 44
Table

25.

The

Periodic

System*

XLII

55

pH O O oo

t*. O co

PQ >o

05 M IN W H

pq tjh

hP CO N

ft. co Om b

03

_ £ £

oo ft. CO CO

ft o N CO o 05 O co

00 S IN r9 I> O IN © CO Ph IN A ^ O CO

IN H IN

02 (M 0 O in w

73

CO

KA 50 w co

50

PQ co J2 co

<3 co O co O co

ft. S 00 U

73 co

Phk th

<N

.Oou o N ^

05 ?* CO

fH 00 CC CO S »>

Ph co * 50

CO

I—I 10 H 10

J3 ^H 02 50

ft O m >0 P 05 —I tJI

73 ft. 50

05 H co w 0 ° b- W co Q1 CO H co H co 70o S r2 05 W co S IN 02 CO I-P-l CO

73

_ £ § r7 00 PJ 10

ft t> M iO

ft co pq 10 O— LLJ iO “ o M 00 2 05 <1 !>•

+= 00

Ph b- O S

Ph bhK

IBS

•5 rHi>

,5M $S00

-3 *°

<3 00

ft h*

Ph 00

pq 00

pft <N Ph 00 rH 00

73

10

ft. CO oo

00

05

05 O 50

05

Jj to <3 05 p "Cfl Pm 05

^r CO ^ O

E> o

(2 £ H 05 3 05

<3 00

f! 00

Ph 00

*" bPh 00

COo

73

CO

•This

arrangement

isby

Catal&n.

The

electrons

indicated

in

column

two

that

are

connected

by

braces

have

approximately

the

same

binding

energy.

Consequently,

for

some

elements

one

type

of

electron

is

preferred

over

another

in

the

normal

configuration,

as

for

example,

Cr,

Cb,

Pd,

La,

Ac,

Th.
z

1

2

34

56

7

8

9

10

11

121314

15

16

17

18

1920

2122

23

XLIII

Table 26. Index—Isoelectronic Sequences

[The tabular entries are page numbers.]

Element

Spectrum

I II III IV V VI VII VIII IX X XI XII XIII XIV XV

H, D, T 1,3

He 4 6 Li 8 10 11 Be 12 14 14 15 B 16 17 19 19 20

C 21 24 26 29 30 31 N 32 35 38 40 42 43 44

O 45 47 50 53 56 58 59 59

F 60 62 64 66 69 71 74 75

Ne 76 81 83 84 86 88

Na 89 91 93 95 96 98 100 103 105

Mg 106 108 109 111 113 114 117 119 121 122 123

A1 124 126 129 130 131 133 135 136 138 140 142 143

Si 144 147 148 150 151 152 154 156 157 159 160 162

P 163 164 166 168 169 170 171 173 174 176 177 179 180

S 181 183 185 187 188 189 190 191 193 194 194

Cl 195 197 199 201 202 204 205 206 207 209 210

A 211 216 218 220 222 223 224 224 225 226 226 226

K 227 230 231 233 234 236 237 238 239 239 241 Ca 242 245 247 248 249 251 252 253 254 255 255 257 258 258

Sc 259 262 263 264 265 266 267 268 269 270 271 272

Ti 273 279 281 283 284 285 286 287 288 288 289 289 290

V 291 298 301 303 304 304 305 306 306 307 307 308 309

HYDROGEN

H

1 electron Z=1

Ground state Is 2S^

Is 2S^ 109678.758 cm"1 I. P. 13.595 volts

This table deals only with the light isotope of hydrogen, H1

; cf. page 3 for the other isotopes.

The levels through n=40 have been calculated by J. E. Mack, “using Ru1= 109677.581 cm-1 and a

2 =5.3256 X10-5

, and taking into account the Lamb-Retherford shift of the s-levels as

well as the Sommerfeld-Dirac fine structure, according to the equation

Level*—Levelco =RA|—n-2Z2 +o:27i-3Z4[— (J+K) -1 +3(4n)-1 +An^]+ • • •}•

Here A is the atomic weight, and a is the Sommerfeld fine-structure constant. The s-shift

parameter A is appreciable only for l— 0, and depends slowly upon n and Z and probably

negligibly upon A; it is found from the work of Lamb and Retherford to be 0.0485 ±0.0002

for the 2s-level of hydrogen, and in the calculation of this table it is assumed to be independent

of n.The intervals are carried one place farther than the level values, insofar as they are accurately known.

The Is 2S^ level consists of two hyperfine structure components separated by 0.0473824

±0.0000008 cm-1

, the lower of which has F=0 and the other F— 1. In any one-electron spectrum the correction arising from any modification AR of the

value accepted for the Rydberg constant may be calculated to a close approximation from the

equation

A(level) = (1n~2)Z2AR.”

REFERENCES

A. Fowler, Report on Series in Line Spectra, p. 89 (Fleetway Press, London, 1922). (T) (C L)

F. Paschen und R. Gotze, Seriengesetze der Linienspektren, p. 22 (Julius Springer, Berlin, 1922). (T) (C L)

H. E. White, Introduction to Atomic Spectra, p. 33 (McGraw Hill Book Co., Inc., New York, N. Y., 1934).

(G D)

J. W. Drinkwater, O. Richardson, and W. E. Williams, Proc. Roy. Soc. (London) [A] 174, 164 (1940). (Fine

structure) C. E. Moore, Princeton Obs. Contr. No. 20, 1 (1945). (C L)

H. A. Bethe, Phys. Rev. 72, 339 (1947). (T) D. E. Nagle, R. S. Julian, and J. R. Zacharias, Phys. Rev. 72, 971 (L) (1947). (hfs)

J. E. Nafe and E. B. Nelson, Phys. Rev. 73, 718 (1948). (hfs) H. Kuhn and G. W. Series, Nature 162, 373 (1948). (Fine structure)

W. E. Lamb, Jr., and R. E. Retherford, Bui. Am. Phys. Soc. 24, No. 1, 59 (1949). (Fine structure)

M. M. Kroll and W. E. Lamb, Jr., Phys. Rev. 75, 388 (1949). (T)

J. E. Mack, unpublished material (1949). (I P) (T) (C L)

1
2 H H

Config. Desig. J Level Interval

Is Is 2 S % 0. 000 2P 2p 2 P° H 82258. 907 Tlo 0354

2s 2s 2 S y2 82258. 942

-I JO. 3651 2P 2p 2 P° iy2 82259. 272 3V 3p 2 P° y2 97492. 198 Tlo 010

3s 3s 2 S y2 97492. 208 J 16.’ 1082 J

0. 0361 3p, 3d 3d 2 D, 3p 2 P° iy2 97492. 306

3d 3d 2 D 2 % 97492. 342 4p 4p 2 P° y2 102823. 835 Tlo 004

4s 4s 2 S y2 102823. 839 J 0! 0456

-J0 4p, 0152 4d 4d 2 D, 4p 2 P° 4d 2 D, 4f 2 F°

iy2 102823. 881

4d,4f 2y2 102823. 896

0. 0076

4/ 4/ 2 F° 3y2 102823. 904

5p 5p 2 P°

y2 105291. 615 Ho 002

5s 5s 2 S y2 105291. 617 J 0. 0233

-Iq 0078 5p, 5

5cZ 2 D, 5p 2 P° i X 105291. 638 5d, 5/ 5d, 2 D, 5f 2 F° 2 % 105291. 646 0 003Q

5/, 5flf 5g 2 G, 5/ 2 F° 3/2 105291. 650

0. 0024 5g 5<? 2 G 4/2 105291. 652 6p 6p 2 P° y2 106632. 135

Tlo. 001 J 0. 0136

-Iq 0045

6s 6s 2 S y2 106632. 136

6p, 6d Qd 2 D, 6p 2 P° iy2 106632. 148

6d, 6/ 6d 2 D, 6f 2 F° 2y2 106632. 152

0. 0022

6/, 0 0014 6gr 6q 2 G, 6/ 2 F° 3y2 106632. 155 6g, 6h 6g 2 G, 6h 2 H° 4y2 106632. 156

0. 0009 6h 6h 2H° 5y2 106632. 157

7s, etc. 7s 2 S, etc.

y2 , etc. 107440. 425

to . 439 0. 014

8s, etc. 8s 2S, etc.

y2 , etc. 107965. 036

to . 045 0. 009

9s, etc. 9s 2 S, etc.

y2 , etc. 108324. 706

to . 714 0. 008

10s, etc. 10s 2 S, etc.

y2 , etc. 108581. 98

11s, etc. 11s 2 S, etc.

y2 , etc. 108772. 33

12s, etc. 12s 2 S, etc.

y2 , etc. 108917. 11

13s, etc. 13s 2S, etc.

y2, etc. 109029. 78

14s, etc. 14s 2 S, etc.

y2 , etc. 109119. 18

15s, etc. 15s 2 S, etc.

y2> etc. 109191. 30

Config Desig. J Level Interval

16s, etc. 16s 2 S, etc.

y2 , etc. 109250. 33

17s, etc. 17s 2 S, etc.

y2 , etc. 109299. 25

18s, etc. 18s 2 S, etc.

y2 , etc. 109340. 25

19s, etc. 19s 2 S, etc.

y2 , etc. 109374. 94

20s, etc. 20s 2 S, etc.

y2 , etc. 109404. 57

21s, etc. 21s 2 S, etc.

y2 , etc. 109430. 06

22s, etc. 22s 2 S, etc.

y2 , etc. 109452. 15

23s, etc. 23s 2 S, etc.

y2 , etc. 109471. 428

24s, etc. 24s 2 S, etc.

y2 , etc. 109488. 346

25s, etc. 25s 2 S, etc.

y2 , etc. 109503. 274

26s, etc. 26s 2 S, etc.

y2 , etc. 109516. 513

27s, etc. 27s 2 S, etc. l/2 , etc. 109528. 309

28s, etc. 28s 2 S, etc.

y2 , etc. 109538. 863

29s, etc. 29s 2 S, etc.

y2 , etc. 109548. 345

30s, etc. 30s 2 S, etc. K» etc. 109556. 894

31s, etc. 31s 2 S, etc. etc. 109564. 629

32s, etc. 32s 2 S, etc. y, etc. 109571. 651

33s, etc. 33s 2 S, etc. etc. 109578. 044

34s, etc. 34s 2 S, etc.

y2 , etc. 109583. 881

35s, etc. 35s 2 S, etc.

y2 , etc. 109589. 225

36s, etc. 36s 2 S, etc.

y2 , etc. 109594. 130

37s, etc. 37s 2 S, etc.

y2 , etc. 109598. 643

38s, etc. 38s 2 S, etc. l/2 , etc. 109602. 804

39s, etc. 39s 2 S, etc.

y2 , etc. 109606. 649

40s, etc. 40s 2 S, etc.

y2 , etc. 109610. 210

00 =Limit 109678. 758

February 1949.
DEUTERIUM and TRITIUM

D and T

1 electron Z—1 Ground state Is 2S^

Is 2S^ D (H2

) 109708.596 cm"1 I. P. D 13.598 volts

Is 2Sh T (H3

) 109718.526 cm"1 I. P. T 13.600 volts

The term values have been calculated by J. E. Mack, “using ED = 109707.419 and Rr —

109717.348 cm-1

, and taking into account the same fine structure as in hydrogen. Lamb and

Retherford have found that the 2s-shift in deuterium is the same as in light hydrogen within

about 0.5 percent. Levels not given here may be calculated from the hydrogen table with the

aid of the correction equations

LevelD —LevelH=(l—vi-2)29.838 cm-1 and LevelT —LevelH =(l—n

-2)39.768 cm-1

. Nafe and Nelson have kindly communicated the results of their hyperfine structure

measurements in tritium in advance of publication. In both isotopes the ls-level has two

hyperfine-structure components, the lower of which has the lower E-value. In deuterium the

separation is 0.01092095 ±0.00000023 cm-1

, and the E-values are 1/2 and 3/2. In tritium the

separation is 0.0505945 ±0.0000010 cm-1

, the E-values 0 and 1.”

REFERENCES

J. W. Drinkwater, O. Richardson, and W. E. Williams, Proc. Roy. Soc. (London) [A] 174, 164 (1940). (Fine

structure) (I S) D. E. Nagle, R. S. Julian, and J. R. Zacharias, Phys. Rev. 72, 971 (L) (1947). (hfs)

J. E. Nafe and E. B. Nelson, Phys. Rev. 73, 718 (1948); 75, in press (1949). (hfs) R. E. Retherford and W. E. Lamb, Jr., Bui. Am. Phys. Soc. 24, No. 1, 59 (1949). (Fine structure)

J. E. Mack, unpublished material (1949). (I P) (T) (C L)

D T

Config. Desig. J Level Level Interval

Is Is 2 S X 0.000 0.000

2p 2p 2 P° X 82281.285 82288.733

i

! 0.0354 JJ

0.3652 2s 2s 2 S / 82281.320 82288.768

2P 2p 2 P° 1/2 82281.650 82289.098

3p 3p 2 P° X 97518.721 97527.547 ~|"| 0.010

-1 0.1082 -1 0.0361

3s 3s 2 S x 97518.731 97527.558

3p, 3

d

3d 2 D, 3p 2 P° i/2 97518.829 97527.656

3d 3d 2 D 2/ 97518.865 97527.692

4p 4p 2 P° z 102851.808 102861.118 11 0.004 J 0.0456 -1 0.0152 0.0076

4s 4s 2 S X 102851.812 102861.122

4p, 4d 4d 2 D, 4p 2 P° 1/2 102851.854 102861.163

4d, 4/ 4d 2 D, 4/ 2 F° 2 / 102851.869 102861.178

4/ 4/ 2 F° 3/ 102851.877 102861.186

5p 5p

2 P° X 105320.260 105329.792 1"| 0.002

-1 0.0233

0.0078

0.0039

0.0024

5s5p, 5d5s 2 S

5d 2 D, 5p 2 P°

X

1/2 105320.262

105320.283

105329.795

105329.816

5d, 5/ 5d 2 D, 5/ 2 F° 2/2 105320.291 105329.824

5/, 5g 5g

2 G, 5/ 2F° 3/2 105320.294 105329.827

5g

2 G 4/2 105320.297 105329.830

6p 6p 2 P° X 106661.144 106670.798

l

s 0.001 J 0.0136 -1 0.0045

0.0022

0.0014

0.0009

6s 6s 2 S X 106661.145 106670.800

6p, 6d 6d 2 D, 6p 2 P° 1/2 106661.158 106670.812

6d, 6/ 6d 2 D, 6/ 2 F° 2/4 106661.162 106670.816

6/, 6g 60 2 G, 6/

2 F° 3/ 106661.164 106670.818

60, 6h 60 2 G, 6h

2 H° 4/ 106661.166 106670.820

6h 6h

2 H° 5/ 106661.167 106670.821

7s, etc. 7s 2 S, etc. X, etc. 107469.654 107479.381

to .669 to .396

oo —Limit 109708. 596 109718. 526

February 1949.
HELIUM

He I

2 electrons Z=

Ground state Is2

Is2 XS0 198305 ±15 cm'1 I. P. 24.580 volts

Most of the terms are taken from Paschen-Gotze with the term values subtracted from

Paschen’s limit as quoted by Robinson in 1937. Higher members of the XF° and 3F° series are taken from Meggers and Dieke. The term 2p

3P° has been calculated from its combination

with 2s 3 Si, using the resolved triplet as observed by Meggers, the intervals being —0.078 cm-1 and —0.996 cm-1

. The components of 3p

3 P° are based on Paschen’s value of 3p

3 P| and the

intervals observed by Gibbs and Kruger; —0.165 cm-1 and —0.192 cm-1

. Some doubt exists regarding the correct classifications of lines attributed to doubly excited

bebum, such as those observed at 309.04 A and 320.38 A by Compton and Boyce, and at 320.392 A and 357.507 A by Kruger. Approximate theoretical computations of the energies of

doubly excited levels have been made by a number of authors and are summarized by Wu.

His classification of the line observed at 320.4 A as 2p

3P°—

p

2 3 P has been adopted and used

for the calculation of 2p

2 3P.

Several references deal with intercombinations in He i, namely, those by Lyman, Hopfield,

Paschen, Suga, and others. The term values based on the excellent long series have been

adopted in the table, since it is believed that they are the most accurate.

REFERENCES

F. Paschen und R. Gotze, Seriengesetze der Linienspektren p. 22 (Julius Springer, Berlin, 1922). (T) (C L)

T. Lyman, Astroph. J. 60, 1 (1924). (T) (C L)

K. T. Compton and J. C. Boyce, J. Franklin Inst. 205, 497 (1928). (C L)

F. Paschen, Sitz. Berlin Akad. Wiss. 30, 662 (1929). (T) (C L)

J. J. Hopfield, Astroph. J. 72, 133 (1930). (T) (C L)

P. G. Kruger, Phys. Rev. 36, 855 (1930). (C L) R. C. Gibbs and P. G. Kruger, Phys. Rev. 37, 1559 (1931). (T)

W. F. Meggers and G. H. Dieke, Bur. Std. J. Research 9, 121, RP462 (1932). (T) (C L)

F. Paschen and R. Ritschl, Ann. der Phys. [5] 18, 888 (1933). (T) (C L)

H. E. White, Introduction to Atomic Spectra p. 209 (McGraw-Hill Book Co., Inc., New York, N. Y., 1934).

(G D)

W. F. Meggers, J. Research Nat. Bur. Std. 14, 487, RP781 (1935). (C L)

T. Suga, Sci. Papers Inst. Phys. Chem. Research (Tokyo) 34, No. 740, 16 (1937). (C L)

H. A. Robinson, Phys. Rev. 51, 14 (1937). (I P)

P. Jacquinot, Compt. Rend. 208, 1896 (1939). (C L) T.-Y. Wu, Phys. Rev. 66, 291 (1944). (C L)

W. F. Meggers, J. Opt. Soc. Am. 36, 431 (1946). (Summary hfs)
Config. Desig. J Level Config. Desig. J Level

Is3 Is3 iS 0 0±15 Is 7s 7s *S 0 195973. 19

Is 2s 2s 3 S 1 159850. 318 Is 7

p

7p

3 P° 2, 1,0 196021. 72

Is 2s 2s J S 0 166271. 70 Is 7

d

7d 3 D 3, 2,1 196064, 00

Is 2

p

2p

3 P° 2 169081. Ill ]s 7d 7d X D 2 196064. 31

1 169081. 189

0 169082. 185 Is 7/ 7/ X F° 3 196065. 4

Is 2

p

2p

1 P° 1 171129. 148 Is 7

/

7/ 3 F° 4, 3,2 196065. 51

Is 3s 3s 3 S 1 183231. 08 Is 7

p

7p

1 P° 1 196078. 41

Is 3s 3s X S 0 184859. 06 Is 8s 8s 3 S 1 196455. 79

Is 3

p

3p 3 P° 2 185558. 92 Is 8s 8s X S 0 196529. 03

1 185559. 085

0 185559. 277 Is 8p 8p 3 P° 2, 1,0 196561. 08

Is 3d 3d 3 D 3, 2,1 186095. 90 Is 8d 8d 3 D 3, 2,1 196589. 42

Is 3d 3d 3 D 2 186099. 22 Is 8d 8d

X D 2 196589. 73

Is 3

p

3p »P° 1 186208. 62 Is 8/ 8/ X F° 3 196590. 8

Is 4s 4s 3 S 1 190292. 46 Is 8

/

8/ 3 F° 4, 3,2 196590. 48

Is 4s 4s iS 0 190934. 50 Is 8p 8p 1 P° 1 196595. 56

Is 4p 4p 3 P° 2, 1,0 191211. 42 Is 9s 9s 3 S 1 196856. 37

Is 4d 4d 3 D 3, 2,1 191438. 83 Is 9s 9s iS 0 196907. 13

Is 4d 4d iD 2 191440. 71 Is 9p 9p 3 P° 2, 1,0 196929. 68

Is 4/ 4/ 3 F° 4, 3,2 191446. 61 Is 9d 9d X D 2 196949. 49

Is 4/ 4/ iF° 3 191447. U Is 9d 9d 3 D 3, 2,1 196949. 63

Is 4p 4p »P° 1 191486. 95 Is 9/ 9/ 1 F° 3 196950. 8

Is 5s 5s 3 S 1 193341. 33 Is 9

/

9/ 3 F° 4, 3,2 196950. 36

Is 5s 5s 3 S 0 193657. 78 Is 9

p

9p iP° 1 196953. 95

Is 5

p

5p

3 P° 2, 1,0 198795. 07 Is 10s 10s 3 S 1 197139. 76

Is 5d 5d 3 D 3, 2,1 193911. 48 Is 10s 10s X S 0 197176. 36

Is 5d 5d iD 2 193912. 54 Is lOp lOp 3 P° 2, 1,0 197192. 68

Is 5/ 5/ 3 F° 3 198914. 81 Is 10d lOd »D 2 197207. 08

Is 5/ 5/ 3 F° 4, 3,2 198915. 79 Is lOd lOd 3 D 3, 2,1 197207. 30

Is 5

p

5p 1 P° 1 193986. 75 Is 10/ 10/ 3 F° 4, 3,2 197208. 0

Is 6s 6s 3 S 1 194930. 46 Is lOp lOp »P° 1 197210. 41

Is 6s 6s X S 0 195109. 17 Is 11s 11s 3 S 1 197347. 05

Is 6p 6p 3 P° 2, 1,0 195187. 21 Is lip llp 3 P° 2, 1,0 197886. 98

Is 6d 6d 3 D 3, 2,1 195254. 37 Is lid lid iD 2 197397. 62

Is 6d 6d 3 D 2 195255. 02 Is lid lid 3 D 3, 2,1 197397. 75

Is 6/ 6/ X F° 3 195256. 7 is 11/ 11/ 3 F° 4, 3,2 197898. 6

Is 6/ 6/ 3 F° 4, 3,2 195256. 82 Is lip lip 1 P° 1 197400. 18

Is 6p 6p X P° 1 195269. 17 Is 12s 12s 3 S 1 197503. 69

Is 7s 7s 3 S 1 195862. 63 Is 12s 12s X S 0 197524. 26
6

He I—Continued He I—Continued

Config. Desig. J Level Config. Desig. J Level

Is 12p 12p 3 P° 2, 1,0 197531 44 Is 16d 16d 3 D 3, 2,1 197876. 41

Is 12d 12d 'D 2 197542. 54 Is 16p 16p 1 P° 1 197877. 04

Is 12d 12d 3 D 3, 2,1 197542. 67 Is 17p 17p 3 P° 2, 1,0 197922. 51

Is I2p 12p 2 P

0

1 197544- 56 Is 17d 17d 3 D 3, 2,1 197925. 33

Is 13s 13s 3 S 1 197624. 98 Is 17p 17p ip° 1 197925. 87

Is 13p 13p 3 P° 2, 1,0 197649. 07 Is 18p 18p 3 P° 2, 1,0 197964. 02

Is 13s 13s iS 0 197649. 78 Is 18d 18d 3 D 3,2,1 197966. 75

Is 13d 13d iD 2 197655. 19 Is 18p 18p 1 P° 1 197966. 80

Is 13d 13d 3 D 3, 2,1 197655. 47 Is 19p 19p 3 P° 2, 1,0 197999. 12

Is 13p 13p J P° 1 197656. 95 Is 19d 19d 3 D 3, 2,1 198001. 43

Is 14s 14s 3 S 1 197721. 13 Is 19p 19p »P° 1 198001. 44

Is 14p 14p 3 P° 2, 1,0 197739. 90 Is 20p 20p 3 P° 2, 1,0 198029. 07

Is 14d 14d J D 2 197744. 918 Is 20p 20p »P° 1 198031. 02

Is 14d 14d 3 D 3, 2,1 197744. 94 Is 20d 20d 3 D 3, 2,1 198031. 41

Is 14p 14p »P° 1 197746. 15 Is 21p 21p 3 P° 2, 1,0 198054. 83

Is 15s 15s 3 S 1 197796. 63 Is 21d 21d 3 D 3, 2,1 198056. 50

Is 15p

la 15d

15p 3 P°

15d 3 D

2, 1,0

3, 2,1

1

197813. 11 197817. 05

Is 22p 22p 3 P° 2, 1,0 198077. 15

Is 15p 15p *P° 197818. 12 He n (

2S*) Limit 198305

Is 16p 16p 3 P° 2, 1,0 197872. 95 2p2 2p23P 2, 1,0 481198

August 1946.

He II

(H sequence; 1 electron) Z=2

Ground state Is 2S^

Is 2Sj^ He3 438889.040 cm-1I. P. He3 54.400 volts

Is 2Sj^ He4 438908.670 cm-1I. P. He4 54.403 volts

The levels have been calculated by J. E. Mack, “using i?He <= 109722.264 and taking into

account the fine structure as in hydrogen, but with A=0.0402± 0.009, from the work of

Skinner and Lamb on the 2s-level. The tentative experimental indication that A decreases

with increasing n has been neglected. Assuming RBe 8=109717.344, the levels of He3 may be

calculated to a close approximation from those of He4 by the equation

LevelHe 3 ii —LevelHe m=- (1—

_2 )19.630 cm-1 . ’
REFERENCES

A. Fowler, Report on Series in Line Spectra, p. 95 (Fleetway Press, London, 1922). (T) (C L)

F. Paschen und R. Gotze, Seriengesetze der Linienspektren, p. 25 (Julius Springer, Berlin, 1922). (T) (C

H. E. White, Introduction to Atomic Spectra, p. 33 (McGraw-Hill Book Co., New York, N. Y., 1934). (G

C. E. Moore, Princeton Obs. Contr. No. 20, 1 (1945). (C L) H. A. Bethe, Phys. Rev. 72, 339 (1947). (T)

J. E. Mack and N. Austern, Phys. Rev. 72, 972 (1947); 74, 1262 (A) (1948). (Fine structure) G. R. Fowles, Phys. Rev. 73, 639 (L) (1948); 74, 219 (L) (1948). (Fine structure) H. Kopfermann and W. Paul, Nature 162, 33 (L) (1948). (Fine structure)

M. Skinner and W. E. Lamb, Jr., Bui. Am. Phys. Soc. 24, No. 1, 59 (1949). (Fine structure)

J. E. Mack, unpublished material (1949). (I P) (T) (C L)

He 3 II He 4 H

Config. Desig. J Level Level Interval

Is Is 2 S Yz 0.000 0.000

2p 2p

2 P° Yz 329164.390 329179.102

2s 2s 2 S Yz 329164.860 329179.572 1 U.'l/U 2P 2p

2 P° i % 329170.135 329184.945

-1 O.o4o4

3p 3p

2 P° Yz 390123.179 390140.622 ' 1 n i a 3s 3s 2 S Yz 390123.318 390140.761

3p, 3d 3d 2 D, 3p 2 P° 1Y 390124.910 390142.353

-J I./ol4t 3d 3d 2 D 2Yz 390125.487 390142.930 U.O 4 4 1.

4p 4p 2 P° Yz 411458.517 411476.917

4s 4s 2 S Yz 411458.576 411476.976 U.UO 4p, 4d 4d 2 D, 4p 2 P° l H 411459.248 411477.648 -M U. / oU4

4d, 4/ 4d 2 D, 4/ 2 F° 2Yz 411459.491 411477.891 U.Z^rOO 4/ 4f

2 F° 3Yz 411459.613 411478.013

5p 5p

2 P° Yz 421333.629 421352.472

5s 5s 2 S Yz 421333.659 421352.502 | U.Uo

5p, 5d 5d 2 D, 5p 2 P° lYz 421334.003 421352.846

-J 5d, 5/ 5d 2 D, 5f

2 F° 2Yz 421334.128 421352.971 U. 1Z4/

5/, 5g 5g 2 G, 5/ 2 F° 3Yz 421334.190 421353.033 U.UOZ-i 5g 5g

2 G, 4)4 421334.228 421353.071 U.Uo 4 *±

6p 6p

2P° Yz 426697.845 426716.928

6s 6s 2 S Yz 426697.862 426716.945 U.UZ

6p, 6d 6d 2 D, 6p

2 P° lYz 426698.062 426717.145

-* U.Z104

6d, 6/ 6d 2 D, 6/ 2 F° 2Y 426698.134 426717.217 U.U/ Z1

6f, 6g 6g

2 G, 6/ 2 F° 3Yt 426698.170 426717.253 U.UoDl

6g, 6h 6g 2 G, Qh 2 H° 4Yz 426698.192 246717.275 U.UZ10

6h 6A 2 H° 5Y 426698.206 426717.289 U.Ul^^:

7s, etc. 7s 2 S, etc. Yz, etc. 429951.508

to .741

8s, etc. 8s 2 S, etc. Yz, etc. 432050.863

tol.023

9s, etc. 9s 2 S, etc. Yz, etc. 433490.169

to .283

10s, etc. 10s 2 S, etc. Yz, etc. 434519.693

to .777

11s, etc. 11s 2 S, etc. Yz, etc. 435281.423

to .486

12s, etc. 12s 2 S, etc. Yz, etc. 435860.778

to .828

13s, etc. 13s 2 S, etc. Yz, etc. 436311.653

to .692

14s, etc. 14s 2 S, etc. Yz, etc. 436669.407

to .439

15s, etc. 15s 2 S, etc. Yz, etc. 436957.026

to 8.052

oo— Limit 438908. 670

February 1949.

U

f
LITHIUM

Li I

3 electrons Z=3

Ground state Is2 2s 2S*

2s 2 S. 43487. 19 ± 0.02 cm"1 I. P. 5.390 volts

The analysis is from Fowler and Paschen-Gotze. Meissner has generously furnished in

advance of publication preliminary results of level splittings derived from observed fine struc- ture of selected lines. These data are as follows:

Term Interval (cm-1

) Line resolved (A) Term Line resolved (A)

2p

2 P°

3d 2 D

4d 2 D

5d 2 D

6d 2 D

0. 3366 ±0. 0005*

0.037 ±0.001

0. 015 ±0. 002

0. 010 ±0. 003

0.005 ±0.003

6707. 912, . 761

6103. 649, . 538

4602. 894, . 826

4132. 618, . 562f

3915. 346, . 295

3s 2 S

4s 2 S

5s 2 S

6s 2 S

8126. 452, . 231

4971. 745, . 661

4273. 127, . 066

3985. 538, . 485

*Average of 6 determinations.

fEdl6n and Lid6n derive a mean value of 4132.60 ±0.02 A and the resulting cor- rected values quoted for 5d

2 D and the limit. The values in the table for the above terms have been calculated from these wavelengths,

except for 5d 2D. Jackson and Kuhn state that the multiplet splitting of 2p

2P°=0.3372±

0.0005 cm.

-1

. The remaining terms given to two decimals have been calculated from the measures by

France. The terms ns 2 S, n=7 to 11, and nd 2D, n=l to 12, are from Werner. All other

term values are from Fowler’s Report.

REFERENCES

N. A. Kent, Astroph. J. 40, 337 (1914). (T) (Z E)

A. S. King, Astroph. J. 44, 169 (1916). (T) A. Fowler, Report on Series in Line Spectra, p. 96 (Fleetway Press, London, 1922). (T) (C L)

F. Paschen und R. Gotze, Seriengesetze der Linienspektren, p. 54, (Julius Springer, Berlin, 1922). (T) (C L)

S. Werner, Studier over Spektroskopiske Lyskilder til Frembringelse af Gnistspektre med Resultater for Lithiums

Gnistspektrum, p. 67 (A. Aschehoug & Co., Dansk Forlag, Kobenhavn, 1927). (I P) (T) (C L) R. W. France, Proc. Roy. Soc. (London) [A] 129, 354 (1930). (I P) (T) (C L)

H. E. White, Introduction to Atomic Spectra, p. 77, 87, (McGraw-Hill Book Co., Inc., New York, N. Y.

1934). (GD)

D. A. Jackson and H. Kuhn, Proc. Roy. Soc. (London) [A] 173, 278 (1939). (I S) W. F. Meggers, J. Opt. Soc. Am. 36, 431 (1946). (Summary hfs). K. W. Meissner, L. G. Mundie, and P. Stelson, Phys. Rev. 74, 932 (1948); 75, 891 (L) (1949). (T) (C L) B. Edl6n and K. Lid6n, Phys. Rev. 75, 890 (L) (1949). (I P) (T)
9

Li I Li I

Config. Desig. J Level Config. Desig. J Level

2s 2s 2 S X 0. 00 12d 12d 2 D 1/, 2/ 42725 2P 2p 2 P° X

1/2 1490S. 66

14904. 00

13p 13p 2 P° X, 1/2 42882. 92

14p 14p 2 P° X, 1/2 42923. 89

3s 3s 2 S X 27206. 12 15p 15p 2 P° 34, 1/2 42995. 51 3P 3p 2 P° X, 1/2 30925. 88

16p 16p 2 P° 34, 1/2 43055. 84

3d 3d 2 D 1)4 31283. 08

2/ 31283. 12 17p 17p 2 P° X, 1/2 48105. 42

4s 4s 2 S )4 35012. 06 18p 18p 2 P° 34, 1/2 43146. 96 4p 4p 2 P° 34, 1/2 36469. 55 19p 19p 2 P° X, 1/2 43181. 84

Ad 4d 2 D 1/2 2/2 36623. 38

36623. 40

20p 20p 2 P° 34, 1/4 43211. 39

21p 21p 2 P° X, 1/2 43237. 16

4/ 4/ 2 F° 2/2 , 3/2 36630. 2 22p 22p 2 P° 34, 1/4 43259. 14

5s os : S 34 38299. 50

23p 23p 2 P° 34, IX 43278. 96 5p 5p 2 P° 34, 1/2 39015. 56

24p 24p 2 P° X, 1/2 43296. 03 5d 5d 2 D 1/2 39094. 93

2/2 39094. 94 25p 25p 2 P° & 1/2 43311. 45

6/ 5/ 2 F° 2/2 , 3/2 39104- 5 26p 26p 2 P° X, 1/2 43324. 81

6s 6s 2 S )4 39987. 64 27p 27p 2 P° & 1/2 43836. 40 6p 6p 2 P° X, 1/2 40390. 84 28p 28p 2 P° & 1/2 43346. 89 6d 6d 2 D 1/4 2/

40437. 31

40437. 32

29p 29p 2 P° X, 1/2 43354. 91

7s 2 S

30p 30p 2 P° & 1/2 43363. 71

7s >4 40967. 9 31p 2 P° >4, 1/2 43372. 06 7p 2 P°

31p 7V 34, 1/2 1 /2 , 2/

41217. 85

32p 32p 2 P° )4, 1/2 43378. 31 7d 7d 2 D 41246. 5 33p 33p 2 P° 34, 1/2 43384. 9 10d lOd 2 D 1 /2 , 2/ 41489

8s 2 S 34p 34p 2 P° 34, 134 48890. 3

8s8V X 41587. 1 35p 2 P° 34, 134 43395. 4 8p 2 P°

35p

X, 1/2 41751. 63

36p 2 P° 34, 1)4 8d 2 D

36p 43400. 5 8d i/2) 2/

>4

41771. 3

9s 2 S

37p 37p 2 P° 34, 1)4 43404. 7

9s 42003. 3 9p 9p 2 P° 34, 1/2 38p 38p 2 P° 34, 1)4 43408. 6

421 18. 27

34, 1)4 43412. 4 9d 9d 2 D 1 /2 , 2/

39p 39p 2 P°

42131. 3

10s 10s 2 S X

40p 40p 2 P° 34, 1)4 43416. 9

42298

lOp lOp 2 P° 34, 1/4 41p 41p 2 P° a, 1 x 43420. 9

42379. 16

lls lls 2 S )4 42p 42p 2 P° 34, 1)4 43424. 3

42510

lip lip 2 P° 34, 1)4 42569. 1 Li 11 (iS0) Limit 43487. 19 lid lid 2 D 1 /2 , 2/ 42578

12p 12p 2 P° 34, 1/4 42719. 14

December 1948.
10

Lin

(He i sequence; 2 electrons) Z—

3

Ground state Is2 'So

Is2 'So 610079±25 cm"1 I. P. 75.6193±0.0031 volts

Singlet series have been published by both Schuler and Werner, the longer ones by Schuler.

In the term Hst Schuler’s rounded off values have been used for the terms 4s to 7s 'S, 5d to 8d 'D

and 8/ 'F°. The limit is from Robinson and the 2p to 4p 'P° terms are from Edl6n. All the

remaining terms are from Werner, who gives also an extrapolated value of 2s X S0 , entered in

brackets in the table.

Intersystem combinations have not been observed, but the long series should give a rebable

determination of the relative positions of the singlet and triplet terms.

REFERENCES

H. Schuler. Zeit. Phys. 37, 568 (1926). (T) (C L)

S. Werner, Nature 116, 574 (L) (1925); 118, 154 (L) (1926). (T) (C L)

S. Werner, Studier over Spektroskopiske Lyskilder til Frembringelse af Gnistspektre med Resultater for Lithiums

Gnistspektrum, p. 59 (H. Aschehoug & Co., Dansk Forlag, Kobenhavn, 1927). (I P) (T) (C L). B. Edl6n, Nova Acta Reg. Soc. Sci. Uppsala [IV] 9, No. 6, 31 (1934). (T) (C L) H. E. White, Introduction to Atomic Spectra p. 209 (McGraw-Hill Book Co., Inc., New York, N. Y., 1934).

(GD)

H. A. Robinson, Phys. Rev. 51, 14 (1937). (I P) (T) (C L)

W. F. Meggers, J. Opt. Soc. Am. 36, 431 (1946). (Summary hfs)

Li II Li II

Author Config. Desig. J Level Author Config. Desig. J Level

Is2 iS Is2 Is2 iS 0 0 4F Is 4/ 4/ iF° 3 582645

2s Is 2s 2s 3 S 1 476046 Is 4p *P Is 4p 4p

JP 0 1 582832

2s Is 2s 2s 0 [490079] 5s Is 5s 5s 3 S 1 591184

2p Is 2p 2p

3 P° 2, 1,0 494273 5S Is 5s 5s 0 591984

Is 2p *P Is 2p 2p

1 P° 1 501816 5p Is 5 p 5p

3 P° 2, 1,0 592141

3s Is 3s 3s 3 S 1 554761 5d Is 5

5d

3 D 3, 2,1 592505

3S Is 3s 3s iS 0 558779 5D Is 5d 5d >D 2 592508

3V Is 3p 3p

3 P° 2, 1,0 559501 5F Is 5/ 5/ iF° 3 592523

3d Is 3d 3d 3 D 3, 2,1 561245 5/ Is 5/ 5/ 3 F° 4, 3,2 592527

3D Is 3d 3d iD 2 561276 5P Is 5p bp ip° 1 592639

Is 3p

3 P Is 3p 3p

JP0 1 561749 6s Is 6s 6s 3 S 1 597122

4s Is 4s 4s 3 S 1 579982 6S Is 6s 6s iS 0 597574

4S Is 4s 4s iS 0 581590 6p Is 6p 6p

3 P° 2, 1,0 597666

4p Is 4p 4p 3 P° 2, 1,0 581897 6d Is 6d 6d 3 D 3, 2, 1 597876

4d Is 4d 4d 3 D 3, 2, 1 582612 6D Is 6d 6d J D 2 597877

4D Is 4d 4d iD 2 582631 6/ Is 6/ 6/ 3 F° 4, 3,2 597886

4/ Is 4/ 4/ 3 F° 4, 3,2 582644 6F Is 6/ 6/ iF° 3 597886
11

Li II—Continued Li II—Continued

Author Config. Desig. J Level Author Config. Desig. J Level

7s Is 7s 7s 3 S 1 600641 8D Is 8d 8d *D 2 603214

7S Is 7s 7s iS 0 600925 8/ Is 8/ 8/ 3 F° 4, 3,2 603221

7d Is 7

d

7d 3 D 3, 2,1 601115 8F Is 8/ 8/ 1 F° 3 603221

7D Is 7

d

7d !D 2 601115

7/ Is 7/ 7/ 3JPO 4, 3,2 601121 Li in (2 Sh) Limit 610079

7F Is 7/ 7/ iF° 3 601122

May 1946. Li in

(H sequence; 1 electron) Z=

3

Ground state Is 2S^

Is 2S^ Li6 hi 987644.9 cm-1

I. P. Li6 hi 122.419 volts

Is 2S^ Li7 hi 987657.8 cm-1

I. P. Li7 hi 122.420 volts

Edlen and Ericson found two lines of the Lyman series, and Gale and Hoag found three

more and the first Balmer line. Edlen points out that careful measurement of the Lyman

line in orders up to the twelfth showed it definitely to the red of the value calculated from the

Dirac theory, with an average discrepancy of about 20 cm-1

. This disagreement vanishes

when the ls-shift, calculated at 19 cm-1

, is taken into account, according to Mack.

J. E. Mack has calculated the terms listed here, “using B^=109728.723 and the same

value of A as in He n, which probably makes the listed ionization energy too low by something

between 0 and 2 cm-1. Assuming i?L16 = 109727.295, the levels of Li6 may be found from the

equation

Levels6 —levelL1 7= — (1 —7i-2)12.9 cm-1 .” REFERENCES

H. G. Gale and J. B. Hoag, Phys. Rev. 37, 1703 (A) (1931). (C L) B. Edl6n arfd A. Ericson, Nature 135, 233 (1930); 127, 405 (1931); Zeit. Phys. 59, 656 (1930). (CL)

J. E. Mack, unpublished material (1949). (I P) (T) (C L)

Li ill Li III

Config. Desig. J Level Interval Config. Desig. J Level Interval

Is Is 2S A 0. 0 5p 5p

2P° A 948152. 2 ”11 0 2

5s 5s 2 S A 948152. 4 M 189

2V 2v

2 P° A 740731. 2 11 O A 5p, 5

d

5d 2 D, 5v

2 P° 1/2 948154. 1 J n fu. 2s 2s 2S A 740733. 6 5d, 5/ 5d 2 D, 5/ 2 F° 2 / 948154. 8 n qi 2V 2V

2P° 1/2 740760. 8

j I zy. oo

5/, 5g 5<7 2 G, 5/ 2 F° 3/ 948155. 1 0 19

5g

2 G 4/ 948155. 3

3V 3p

2P° A 877915. 9

3s 3s 2 S A 877916. 6

U. 7 3p, 3d 3d 2 D, 3p 2P° 1/2 877924. 7 J 0. 4 4 6s, etc. 6s 2 S, etc. A, etc. 960223. 7 3d 3d 2 D 2/ 877927. 6 to 5. 5

4p 4p

2P° A 925929. 4 11 no 7s, etc. 7s 2S, etc. A, etc. 967502. 3

4s 4s 2 S A 925929. 7 to 3. 5

4p, 4d 4d 2 D, 4v

2 P° 1/2 925933. 1 J 0. /U 4d, 4

f

4d 2 D, 4/ 2F° 2/ 925934. 3

1. Zo

4/ 4f

2 F° 3/ 925934. 9

0. 62

00 = Limit 987657.

8

February 1949.
12

BERYLLIUM

Bel

4 electrons Z=

Ground state Is2 2s2

2s2 XS0 75192.29 cm"1 I. P. 9.320 volts

All but four of the terms are from the work of Paschen or Paschen and Kruger. According

to Paschen no intersystem combinations have been observed. The relative positions of the

singlet and triplet terms are, however, excellently determined by long series with a relative

uncertainty x not exceeding ±2 cm-1

. The predicted position of the resonance line, 2s2 2p 3 P°, is 4548.29 A. Paton and

Nusbaum have observed a line at 4553.07 A to which they assign this classification, but their

result has not been confirmed.

The term values of higher series members, calculated from the series formula but not

substantiated by observation, are in brackets in the table.

Four terms are from Edl4n’s work: 2p

2 *D, 3

p

3P°, 2p2 XS, and 3p

3P.

REFERENCES

R. F. Paton and R. E. Nusbaum, Phys. Rev. 33, 1093 (A) (1929). (C L)

F. Paschen and P. G. Kruger, Ann. der Phys. [5] 8, 1005 (1931). (T) (C L)

F. Paschen, Ann. der Phys. [5] 12, 514 (1932). (I P) (T) (C L)

B. Edl6n, Nova Acta Reg. Soc. Sci. Uppsala [IV] 9, No. 6, 51 (1934). (T) (C L)

H. E. White, Introduction to Atomic Spectra, p. 179 (McGraw-Hill Book Co., Inc., New York, N. Y., 1934).

(G D)

W. F. Meggers, J. Opt. Soc. Am. 36, 431 (1946). (Summary hfs)

Bel Bel

Config. Desig. J Level Interval Config. Desig. J Level Interval

2s2 2s2 3 S 0 0. 00 2s(2 S)3p 3p »P° 1 [60187]

2s(2S)2p 2p

3 P° 0 21979. 4S-\-x

0. 68

2. 35

2s(2 S)3d 3d 3 D 1, 2,3 62054.8 +x

1 21980. 11+x

2 21982. 46 +x 2s (

2S) 3d 3d l D 2 64428. 15

2s(2 S)2p 2p

ip° 1 42565. 8 2s(2 S)4s 4s 3S 1 64507. 7 -fa;

2s(2 S)3s 3s 2 S 1 52082. 07-fa; 2s (

2 S) 4s 4s iS 0 65245. 4

2s (

2S) 3s 3s iS 0 54677. 2 2s (

2 S) 4

p

4p 3 P° 0, 1,2 [65949] +x

2p

2 2p2 J D 2 56432. 5 2s (

2 S) 4p 4p »P° 1 [67228]

2s(2S)3p 3p 3 P° 0, 1,2 58791.6 +x 2s (

2S) 4d 4d 3 D 1. 2,3 67943. 6 +x

2p

2 2p2 3 P 0 59694. 61 -fa;

1. 40

2. 03

2s (

2 S) 4d 4d iD 2 68781. 2

1 59696. 01 -fa; 2 59698. 04-fa; 2s (

2S) 5s 5s 3 S 1 69009. 3 -f x
13

Be I—Continued Be I—Continued

Config. Desig. J Level Interval Config. Desig. J Level Interval

2s (

2 S) 5s 5s *S 0 69322. 3 2s (

2 S) 9d 9d 3 D 1, 2,3 73803.2 +x

2s (

2 S) 5p 5p *P° 0, 1,2 [69684. 5] +x 2s (

2 S) 9d 9d 2 D 2 73866. 9

2s (

2 S) 5

d

5d *D 1,2,3 70606. 7 +x 2s (2S) 10s 10s X S 0 73930. 4

2s (

2 S) 5

d

5d 2 D 2 71002. 3 2s (

2S) lOd lOd 3 D 1,2,3 74070. 6 +x

2s (

2 S) 6s 6s *S 1 71161.9 +x 2s (

2 S) lOd lOd iD 2 74116. 7

2s (

2 S) 6s 6s »S 0 71320. 7 2s (

2 S) 11s 11s iS 0 74163. 4

2s (

2S) 6p 6p *P° 0, 1,2 [71482. 9] +x 2s (

2S) lid lid 3 D 1, 2,3 74268. 6 +x

2p

2 2P2 X S 0 71498. 9 2s (

2 S) lid lid JD 2 74301. 4

2s (

2 S) 6

d

6d *D 1,2,3 72030. 6 +x 2s (

2 S) 12d 12d 3 D 1,2,3 74416.3 +x

2s (2 S) 6

d

6d iD 2 72251. 1 2s (

2 S) 12d 12d iD 2 74443. 2

2s(2S)7s 7s *S 1 72355.4 +x Be n (

2S^) Limit 75192. 29

2s (

2 S) 7s 7s *S 0 72448. 3 2p (

2 P°) 3s 3s 3 P° 0 85554. 96 +x

1 85557. 01 +x a. Uo

2s (2 S) 7

d

7d 3 D 1,2,3 72881.9 +x 2 85560. 98+x 3. 92

2s (

2 S) 7

d

7d *D 2 73017. 2 2p (

2 P°) 3p 3p 3 P 0

i 2s (

2S) 8s 8s *S 1 73089. 1 +x 2 91901.8 +x

2s (

2S) 8s 8s »S 0 73146. 7 2p (

2 P°) 3d 3d 3 D° 1 [94189.51]+x

2 94190. U+x u. ou

2s (

2S) 8

d

8d *D 1, 2,3 73429. 6 +x 3 94191. 26+x 1. 15

2s (

2S) 8

d

8d

2 D 2 73519. 7 2p (

2P°) 3d 3d »P° 0 95162. 1 +x

1 95163. 1 +x 1. u

2s (

2S) 9s 9s 2 S 0 73608. 5 2 95165.0 +x 1. 9

May 1946.

Be i Observed Terms*

Config.

ls2 +

Observed Terms

2s2 2s2 X S

2s(2S)2p

{

2p »P° 2p »P°

2p2 { 2p2iS

2p2 3 P

2p2 !D

ns (n> 3) np (n> 3) nd (n> 3)

2s(2S)nx /3- 8s 3 S 3p 3P° 3-12d 3 D

\3-l Is iS 3-12d >D

2p(2 P°)nx 3s 3 P° 3p »P 3d *P° 3d 3 D°

*For predicted terms in the spectra of the Be i isoelectronic sequence, see Introduction.
14

Be II

(Li i sequence; 3 electrons) Z=

Ground state Is2 2s 2S^

2s 2S^ 146881.7 cm"1 I. P. 18.206 volts

The analysis has been taken from the paper by Paschen and Kruger.

REFERENCES

F. Paschen and P. G. Kruger, Ann. der Phys. [5] 8, 1014 (1931). (I P) (T) (C L)

H. E. White, Introduction to Atomic Spectra p. 98 (McGraw-Hill Book Co., Inc., New York, N. Y., 1934). (G D)

W. F. Meggers, J. Opt. Soc. Am. 36, 431 (1946). (Summary hfs) Ben Ben

Config. Desig. J Level Interval Config. Desig. J Level Interval

28 2s 2 S X 0. 0 5/ 5/ 2 F° 2X, 3X 129321. 9

2V 2p

2 P° X

ix

81928. 8

81935. 4

6. 6

6s 6s 2 S X 133559. 1 Qp 6p

2 P° X

3s 3s 2S X 88231. 2 IX 184485. 6

3p 3p

2 P° X 96496. 4 1. 8

6d 6d 2 D ix, 2X 134682. 0

ix 96498. 2

6/ 6/ 2 F° 2X, 3X 134688. 1 3d 3d 2 D IX, 2X 98053. 2

7s 7s 2 S X 137226. 0

48 4s 2 S X 115465. 2 7p Ip 2 P° X

4p 4p 2 P° X IX 187796

ix 118760

Id Id 2 D IX, 2X 137920. 0

4d 4d 2D ix, 2X 119422. 2

7/ 7j

2JTO 2X, 3X 137923. 1 4/ 4/ 2 F° 2X, 3X 119444 6

8d 8d 2 D ix, 2X 140020. 4

5s 5s 2S X 127336. 1 5p 5p

2 P° X

ix

ix, 2X

128970. 2 Be in OSo) Limit 146881. 7

5d 5d 2 D 129311. 3

April 1946. Be III (He i sequence; 2 electrons) Z=4

Ground state Is2

Is2 'So 1241225 ±100 cm'1 I. P. 153.850 ±0.012 volts

Both Robinson and Edlen report six lines of the singlet series observed, although the

earlier members have also been measured by others. The range is between 81 A and 100 A.

The singlet terms have been taken from Robinson’s paper.

The relative absolute values of the triplet and singlet terms have been determined by

extrapolation of 3d

3D from He i and Li n, according to Edlen, who has generously furnished

his unpublished term values of the triplets. Apparently no intersystem combinations have

been observed in Be hi, but the existence of the observed line Is2 XS0 —2^p

3 P° in the related

spectra from B iv to A1 xii, within the errors of measurement of the predicted positions, indicates

that the uncertainty x is small.

REFERENCES

B. Edl6n, Nova Acta Reg. Soc. Sci. Uppsala [IV] 9, No. 6, 31 (1934). (T) (C L)

H. A. Robinson, Phys. Rev. 51, 14 (1937). (I P) (T) (C L)

B. Edl6n, unpublished material (Sept. 1947). (T)
15

Be ill Be m

Config. Desig. J Level Interval Config. Desig. J Level Interval

Is2 Is2 J S 0 0 Is 4p 4p 1 P° 1 1179830

Is 2s 2s 3 S 1 956496 +x Is 5p 5v

J P° 1 1201894

Is 2

p

2v

3 P° 0 Is 6p 6p 'F° 1 1213931

1 983848+x 15

2 988863+x Is 7p 7v

: P° 1 1221135

Is 2p

Is 3p

2p

iP°

3v

1 P°

1 997466

1 1182323 Be iv (

2 Sji) Limit 1241225

September 1947.

Be IV

(H sequence; 1 electron) Z=4

Ground state Is 2S^

Is 2Sh 1756004 cm"1 I. P. 217.657 volts

Edlen and Ericson first observed this spectrum. Tyren has observed three, and Robinson

six, members of the principal series. The terms in the table have been calculated by J. E. Mack, who has used RBe9 = 109730.623

and A=0.040.

REFERENCES

B. Edl6n and A. Ericson, Nature 125, 233 (1930) ; 127, 405 (1931) ; Zeit. Phys. 59, 656 (1930). (C L) H. A. Robinson, Phys. Rev. 50, 99 (1936). (C L)

F. Tyr6n, Zeit. Phys. 98, 771 (1936). (C L)

J. E. Mack, unpublished material (1949). (I P) (T) (C L)

Be IV Be IV

Config. Desig. J Level Interval Config. Desig. J Level Interval

Is Is 2 S 0 5p 5p

2 P° X 1685766 llo 5 5s 5s 2 S X 1685767 J 6 0

2 V 2p 2 P° y* 1316965 11 7

5p, 5

d

5d 2 D, 5v

2 P° 1 X 1685772 Jo 0

2s 2s 2 S V2 1316972 J 93 5 5d, 5/ 5d 2 D, 5/ 2 F° 2]4 1685774 1 0

2V 2p

2 P° IX 1317058 5/, 5<7 5g2 G, 5/ 2 F° 3 H 1695775

0. 6 bg 2 G 4^ 1685776

3V 3p

2 P° X 1560886 11 2 3s 3s 2 S X 1560888 J 27 6

6s, etc. 6s 2 S, etc. X 1707229

3p, 3d 3d 2 D, 3p

2 P° IK 1560913 -* \L( . D to 234

3d 3d 2 D 2/2 1560923 y. z

7s, etc. 7s 2 S, etc. X 1720170

4p 4p

2 P° X 1646254 11 1 to 173

4s 4s 2 S y2

- 1646255

4p, 4d 4d 2 D, 4p

2 P° 1 X 1646266

J 11. 7

-1 Q Q

4d, 4/ 4d 2 D 4/ 2 F° 2V2 1646270 00= Limit 1756004

4/ 4/ 2 F° CO h\ 1646272 1. y

February 1949.
16

BORON

Bl

5 electrons Z—5

Ground state Is 22s2 2p

2P°^

2p

2P°$ 66930 cm-1

I. P. 8.296 volts

The spectrum is incompletely observed, but 34 lines have been classified in the interval

between 1378 A and 2498 A. The terms for which there is an entry in the column of the table

headed “Authors”, are from Edlen, but a correction of 90 cm-1 has been added to the limit as quoted from Selwyn (66840 cm-1

) . Whitelaw and Mack have recalculated the limit and derived

the value B i 2s2 2p

2Pf —B n 2s2

S0 =66930 cm-1

, using the 2D series alone because of extra- configurational perturbations in the 2S series. Selwyn averaged the limits from both the 2S

and 2D series. The remaining terms are from an unpublished manuscript kindly furnished by Clearman,

who has extended the doublet series by further observations and confirmed the correction to the limit mentioned above. Clearman has also found two quartet terms. No intersystem

combinations have been observed, as indicated by $ in the table. Edl6n estimates that

2£>

2Pi§—2p24P2£=28800 cm-1

, by analogy with the observed intersystem combinations in

C ii and N in. The corresponding value of 2p

2 4Pi is entered in brackets in the table and has

been added to all of Clearman’s values of quartet terms.

REFERENCES

I. S. Bowen, Phys. Rev. 29, 231 (1927). (T) (C L)

E. W. H. Selwyn, Proc. Phys. Soc. (London) 41, 401 (1929). (T) (C L)

B. Edl6n, Nova Acta Reg. Soc. Sci. Uppsala [IV] 9, No. 6, 74 (1934). (T)

H. E. White, Introduction to Atomic Spectra p. 115 (McGraw-Hill Book Co., Inc., New York, N. Y., 1934). (G D)

N. G. Whitelaw and J. E. Mack, Phys. Rev. 47, 677 (1935). (I P) (T) B. Edl€n, Zeit. Phys. 98, 564 (1936). (C L)

W. Opeschowski and D. A. DeVries, Physica 6, No. 9, 913 (1939). (I S)

W. F. Meggers, J. Opt. Soc. Am. 36, 431 (1946). (Summary hfs) H. E. Clearman Jr., unpublished material (Aug. 1947). . (T) (C L)
17

Bl Bl

Authors Config. Desig. J Level Interval Authors Config. Desig. J Level Interval

2p

2 Pi

2 Pa

2s2 0S)2p 2p 2 P° X

i X

0

16

16 5d 2 D 2s2 0S)5d 5d 2 D J l/2 l 2/ }

62481

2s 2p2 2

p

2 4 P X [28805] +x 5

2s 2p2 2

p

2 2 S X 63561

i X 28810 +z A

1 1/2

1 2/2 2

p' «P3 2X 28816 +z 6d 2 D 2s2 0S)6d 6d 2 D

}

63847

3s 2Si 2s2 OS) 3s 3s 2 S X 40040 282 08)78 7s 2 S X 64156

2

p' 2 D 2s 2

p

2 2p2 2 D { 1%

l 2/2 }

47857 2s2 OS) 7d 7d 2 D J

1/2

1 2/2 }

64664

3d 2D 2s2 OS) 3d 3d 2 D J IX

i 2/ }

54765 2s2 0S)8d 8d 2 D {

1 X

1 2/2 }

65195

4s 2 Si 2s2 OS) 4s 4s 2 S X 55009 2s2 OS) 9s 9s 2 S X 65553

4d 2 D 2s2 0S)4d 4d 2 D { ix

l 2/2 |

59989 Bii OSo) Limit 66930

2s 2p

2 2p2 2 P X 72535

12

5s 2 Sj 2s2 OS) 5s 5s 2 S X 60146 1/2 72547

2s2 OS) 6s 6s 2 S /a 62098 2p3 2p3 ^S° 1 X 97037+x

August 1947. B i Observed Terms*

Config.

ls2 +

Observed Terms

2s2 0S)2p 2p

2 P°

2s 2

p

2 / 2p2 4P

\ 2

p

2 2 S 2

p

2 2 P 2p2 2 D

2p

3 2p3 4 S°

ns (n> 3) nd (n> 3)

2s2 0S)nz 3-7s, 9s 2 S 3-8d 2 D

*Por predicted terms in the spectra of the B i isoelectronic sequence,

see Introduction.

B ll

(Be i sequence; 4 electrons) Z=5

Ground state Is2 2s2

2s2 l S0 202895 cm"1 I. P. 25.149 volts

The terms are from Edl6n, who remarks that the observed series, especially in the singlet

system, are too short for the precise determination of the limits. By analogy with Be i, C in,

and N iv, he interpolates the value of 2s2 ^o—2p 3Pi as 37340 cm-1

, which places the limit

2s2 1S0 at 202895.0 cm-1

. The absolute values of the singlet terms as published in Edl6n’s

Monograph have therefore been increased by 249 cm-1

. The relative uncertainty x is probably

less than this. No intersystem combinations have been observed.

An extrapolated value of 3s x So is given in brackets.
18

B n—Continued

REFERENCES

B. Edl6n, Nova Acta Reg. Soc. Sci. Uppsala [IV] 9, No. 6, 51 (1934). (T) (C L)

B. Edl5n, Zeit. Phys. 98, 561 (1936). (I P) (C L)

Bn Bn

Edl6n Config. Desig. J Level Interval Edl6n Config. Desig. J Level Interval

2s »S0 2s2 2s2 iS 0 0. 0 4p 3 P 2s(2 S)4p 4p

3 P° 0, 1,2 171544 7+X

2p *P0 2s(2S)2p 2p

3 P° 0 873SS. 6 +x

6. 4

16. 4

4d 3 D 2s(2 S)4d 4d 3 D 1, 2,3 174072. 6+x

*Pi 1 87840. 0+x

*P2 2 37856. 4+x 4/ 3F 2s(2 S)4f 4/ 3F° 2, 3,4 174902. 5+x

2p 'Pi 2s(2 S)2p 2p

iP° 1 73896. 7 4/

1 F3 2s(2 S)4/ 4/ iF° 3 174921. 5

2

p' *Po 2p2 2p2 3 P 0 98910. 3+x

8. 4

14. 0

4d »D2 2s(2 S)4d 4d iD 2 175546. 0

*Pi 1 98918. 7+x

*P2 2 98932. 7+x 5s 3 Si 2s(2 S)5s 5s 3 S 1 180896. 5+x

2p' 3 D2 2p2 2

p

2 iD 2 102362. 1 3s' 3 P0 2p(2P°)3s 3s 3 P° 0 181645. 2+x

9. 8

20. 9

3 Pj 1 181655. 0+x

2

p' 'So 2p

2 2p2 iS 0 127662. 0

3 P2 2 181675. 9+x

3s 8 S, 2s(2S)3s 3s 3 S 1 129772. 9+x 5d 3 D 2s(2 S)5d 5d 3 D 1, 2,3 184633. 1+x

3s ‘So 2s(2 S)3s 3s »S 0 [135946] 5/ 3 F 2s(2 S)5/ 5/ 3 F° 2, 3,4 184908. 2+x

3v *Poi 2s(2 S)3p 3p

3 P° 0,1 148989. 7+x

3. 7

3

p' 'Pi 2p (2 P°) 3p 3p X P 1 189126. 6 ®P2 2 143993. 4+x

3d' 3 F23 2p(2 P°)3d 3d 3 F° 2,3 1947487 +x 12 3p 'Pi 2s(2S)3p 3p iP° 1 144102.

3 f4 4 1947607 +x

3d *D 2s(2S)3d 3d 3 D 1, 2,3 150649. 0+x 3d' iD2 2p(2 P°)3d 3d 1 D° 2 197721. 0

3d 3 D2 2s(2 S)3d 3d »D 2 154686. 9 3d' 3 D 2p (2 P°)3d 3d 3 D° 1, 2,3 200484• 6 +x

4s 3 Si 2s(2 S)4s

2s(2S)4s

4s 3 S 1 166344. 4+x

4s XS0 4s *S 0 167934. 2 B in (

2 S*) Limit 202895

May 1946. B ii Observed Terms*

Config.

ls*+ Observed Terms

2s2 2s* 3S

2s(2S)2p {

2p »P° 2p *P°

2p*

{ 2p*iS

2

p

2 »P

2p2 3 D

ns (n> 3) np (n> 3) nd (n>3) nf (n> 4)

2s(2S)nx /3-5s 3S

\ 4s iS

3, 4p 3 P°

3p 3 P°

3-5

3 D

3, 4d *D

4, 5/ 3 F°

4/iF0

2p(2 P°)nx {

3s 3 P°

3p >P 3d 3 D° 3d 3F°

3d iD°

For predicted terms in the spectra of the Be i isoelectronic sequence, see Introduction.
19

Bm

(Li i sequence; 3 electrons) Z=5

Ground state Is2 2s 2S*

2s 2S* 305931.1 cm"1 I. P. 37.920 volts

The terms are from Edl6n. The absolute values are based on the assumption that n* for

5g

2G equals that of the corresponding term in C iv, where 5g

2 G—

6

h

2H° has been observed.

The precision of this term in B iii is estimated to be within ±1 cm-1

. The series are well

represented by a Ritz formula.

Edl4n gives four extrapolated term intervals, which are entered in brackets in the table.

REFERENCES

A. Ericson and B. Edl6n, Zeit. Phys. 59, 676 (1930). (T) (C L)

B. Edl&n, Nova Acta Reg. Soc. Sci. Uppsala [IV] 9, No. 6, 37 (1934). (I P) (T) (C L) (G D)

Bm Bm

Edl6n Config. Desig. J Level Interval Edl6n Config. Desig. J Level Interval

2s J Si 2s 2s 2 S X 0. 0 5p 5p 2 P°

[2. 2] 5p

2 P2 1/4 265719. 7

2v

3 Pi 2P 2p

2 P° H 48358. 5

34. 1

2 P2 i}4 48392. 6 1M

5d 2 D3 5d 5d 2 D

2/ 266389. 5

3s *Si 3s 3s 2 S K 180201. 8

3p 2 Pi 3P 3p 2 P° H 192949. 2

10. 2

5/ 2F 5/ 5/ 2F° f 2/

l 3/2 } 266416. 5

2 P2 itt 192959. 4

3d 3d 2 D 1H [3. 4] 5g

2 G 5g og 2 G

/ 3/

l 4J4 } 266427.

2

3d 2 Dj 2% 196071. 2

6d 6d 2 D 1/

4s 2 Si 4s 4s 2 S H 237695. 5 6d 2 D3 2/ 278473. 7

4p 2 Pj 4p 4p 2 P°

1/ 242832. 4

[4. 3] 6/ 2F 6/ 6/ 2 F° / 2/

\ 3/ } 278491. 7

4d 2 Dj

4d 4d 2 D IK

2/ 244138. 9

[1. 4] 6g

2 G 6g 6g 2 G £-

CO } 278497. 5 4/*F 4f 4/ 2F° co

to } 244199.

2

5s ^ 5s 5s 2 S

J 263156. 2 B iv pSo) Limit 305931. 1

April 1946. B IV

(He I sequence; 2 electrons) Z=5

Ground state Is2 'S0

Is2 'So 2091960 ±200 cm"1 I. P. 259.298 ±0.025 volts

The singlet terms are from Tyr5n and the observed singlet combinations are in the range

from 48 to 60 A. The unit adopted by Tyr&i, 103 cm-1

, has here been changed to cm-1

. Relative absolute values of the triplet terms were derived by the extrapolation of 3d 3D

from He i and Li n, according to unpublished material generously furnished by Dr. Edl&n.

These calculations have confirmed the classification by Tyren of a line at 61 A as the intersystem combination Is2 'So— 2p 3P°. The triplet terms have been taken from Edl6n’s 1947

manuscript.
20

B IV—Continued

REFERENCES

B. Edl6n, Nova Acta Reg. Soc. Sci. Uppsala [IV] 9, No. 6, 31 (1934). (T) (C L)

H. A. Robinson, Phys. Rev. 51, 14 (1937). (I P) (T) (C L)

F. Tyr6n, Nova Acta Reg. Soc. Sci. Uppsala [IV] 12, No. 1, 24 (1940). (I P) (T) (C L)

B. Edl6n, unpublished material (Sept. 1947). (T)

B IV B IV

Config. Desig. J Level Interval Config. Desig. J Level Interval

Is2 Is2 iS 0 0 Is 4p 4p

iP° 1 1982750

Is 2s 2s 2 S 1 1601505 Is 5p 5v ‘P0 1 2022000

Is 2p 2p

3 P° 0

1 16368981636882

-16

52

Is 6p 6v

1 P° 1 2043360

2 1636934

Bv(2 Sh) Limit 2091960

Is 2p 2p »P° 1 1668020

Is 3p 3p »P° 1 1898180

September 1947. B V

(H sequence; 1 electron) Z=

Ground state Is 2S^

Is 2S^ 2744063 cm"1 I. P. 340.127volts

Edlen first observed the Lyman line. Tyren has observed three members of the series.

The fisted term values have been calculated by J. E. Mack forB n v, “using EBn = 109731.835

and A=0.040; a change of 1 percent in A would change the series limit by 1.46 cm-1

. For B10 the series limit is less by 13.6 cm-1 than for B

11 .” REFERENCES

B. Edl6n, Nova Acta Reg. Soc. Sci. Uppsala [IV] 9, No. 6, 28, 152 (1934). (T) (C L)

F. Tyr6n, Zeit. Phys. 98, 771 (1936). (C L)

J. E. Mack, unpublished material (1949). (I P) (T) (C L)

B V B V

Config. Desig. J Level Interval Config. Desig. J Level Interval

Is Is 2 S K 0 4p 4p

2 P° y2 2572561 11 9

4s 4s 2S y2 2572563

2V 2p

2 P° X 2057954 11 1

S

4p, 4d 4d

2 D, 4p 2 P° iy2 2572589

-I I Zo. o

-J q c; 2s 2s 2 S X 2057972 OOQ Q 44,4/ 4d 2 D, 4/ 2 F° 2% 2572599 A Q 2V 2p

2 P° 1 X 2058182

-i

| 6LO. O

4/ 4/ 2 F° 3/2 2572603 o

3V 3p 2P° y2 2439151 5s 5s 2 S, etc. etc, 2634306

3s 3s 2 S y2 2439156 J 67 6 to 330

3p, 3d 3d 2 D, 3v

2 P° iy2 2439218

-J 1 O/. 0

-J OO A 3d 3d 2 D 2y2 2439241

oo =Limit 2744063

February 1949.
21

SEE REVISION IN NSRDS-NBS 3, Section 3, October 1970.

CARBON

Cl

6 electrons Z=6

Ground state Is2 2s2 2p2 3P0

3P0 90878.3 cm"1 I. P. 11.264 volts

The term assignments are taken from Edlen, who has revised and extended the earlier

work on the analysis of this spectrum. Two extrapolated term values, derived from the irregular doublet law, are entered in brackets in the table.

The singlet and triplet terms are well connected by intersystem combinations. Only two

quintet terms are known. They are connected with the rest by intersystem combinations

based on the measures of the resonance lines by Shenstone.

One term, 5p *S, has been revised as suggested in the 1939 reference listed below.

Selected term values of C i have been improved from a study of the lines that have been

clearly identified in the Infrared Solar Spectrum. Such precision cannot be expected from

terms based on lines in the ultraviolet. As a starting point the value of 3s 3Pi=60353. 00 cm-1 was adopted as correct, to agree with Shenstone’s recent measures. Excellent agreement was

found between the laboratory measures of Kiess (8335 A to 11330 A) and solar wave-numbers

of lines identified as C i in the solar spectrum. Further to the red solar wavelengths surpass

laboratory values in accuracy and give consistent internal separations within the multiplets.

In the course of this work all term values have been recalculated. Consequently, most of

the listed values differ slightly from those published by Edl6n. No changes have been made in

his analysis, but the level 3d

3 P°, calculated from solar wave-numbers, has been added to his list. REFERENCES

A. Fowler and E. W. H. Selwyn, Proc. Roy. Soc. (London) [A] 118, 34 (1928). (T) (C L)

S. B. Ingram, Phys. Rev. 34, 421 (1929). (T) (C L)

F. Paschen and G. Kruger, Ann. der Phys. [5] 7, 1 (1930). (T) (C L) B. Edl6n, Nova Acta Reg. Soc. Sci. Uppsala [IV] 9, No. 6, 104 (1934). (I P) (T) (C L)

H. E. White, Introduction to Atomic Spectra p. 266 (McGraw-Hill Book Co., Inc., New York, N. Y., 1934). (G D)

C. C. Kiess, J. Research Nat. Bur. Std. 20, 33, RP1062 (1938). (C L)

W. F. Meggers, J. Opt. Soc. Am. 36, 431 (1936). (Summary hfs) Y. Ishida, T. Tamura, and M. Fukushima, Sci. Papers Inst. Phys. Chem. Research (Tokyo) 36, No. 936, 417

(1939). (T) (C L) H. D. Babcock and C. E. Moore, Carnegie Inst. Wash. Publ. 579 (1947). (Solar data) B. Edl6n, Nature 159, No. 4030, 129 (1947). (C L)

A. G. Shenstone, Phys. Rev. 72, 411 (1947). (T) (C L)
22

Cl Cl

Edl6n Config. Desig. J Level Interval Edl4n Config. Desig. J Level Interval 2p 3 P0 2s2 2p2 2p2 3 P 0 0. 0 Ifi A. 4d X D2 2s2 2p(2 P°)4d 4d X D° 2 83500 3 Pi 1 16. 4

27. 1 *P2 2 43. 5 2s2 2p(2 P°)4d 4d 3 F° 2 4d 3F* 3 83761

2p X D2 2s2 2p2 2p2 iD 2 10193. 70 4 2px So 2s2 2p2 2p2 3 S 0 21648. 4 4d 3 Di 2s2 2p(2 P°)4d 4d *D° 1 83830 7 3 D2 2 83837

10 2s 2p3 2p3 

S° 2 SS7S5. £ 3 d3 3 83847

3s 3 P0 2s2 2p(2 P°) 3s 3s 3 P° 0 60S83. 80

19. 20

40. 52

5s X PX 2s2 2p(2 P°)5s 5s X P° 1 83882. 5

*Pi 3 P2 1 60353. 00 2 60393. 62 4d X F3 2s2 2p(2 P°)4d 4d X F° 3 83949

3s iPi 2s2 2p(2 P°)3s 3s X P° 1 61982. 20 4d X PX 2s2 2p(2 P°)4d 4d X P° 1 84032 2p' 3 D3 2s 2p3 2p3 3 D° 3 64088. 56 4 63 4d *P2 2s2 2p(2P°)4d 4d 3 P° 2 84102. 6 o *d2 2 64093. 19

1. 18 3Pi 1 84112

y

*Di 1 64092. 01 3 Po 0 3v *Pi 2s2 2p(2 P°)3p 3p X P 1 68858 5p »Pj 2s2 2p(2 P°)5p 5p X P 1 84852. 13 3p 3 DX 2s2 2p(2 P°)3p 3p 3 D 1 69689. 79

21. 20

33. 41 5p 3 D2 2s2 2p(2 P°)5p 5p 3 D 1 3 D2 2 69710. 99 2 84952

34 *D, 3 69744. 40 3 d3 3 84986. 2 3p 3 Si 2s2 2p(2 P°)3p 3p 3 S 1 70744. 26 5p X D2 2s2 2p(2 P°)5p 5p X D 2 85400. 38 3p 3 Po 2s2 2p(2 P°)3p 3p 3 P 0 71352. 81 12 42 5p X S0 2s2 2p(2 P°)5p 5p X S 0 85625. 84 3 Pi »P2 1 71365. 23

20. 47 2 71385. 70 5d X D2 2s2 2p(2 P°)5d 5d X D° 2 86187

3p 1 D2 2s2 2p(2 P°)3p 3p X D 2 72611. 06 5d 3 F2 2s2 2p(2P°)5d 5d 3 F° 2 86319 3 8 f3 3 86326. 9 3p X S„ 2s2 2p(2 P°)3p 3v 0 73976. 23 4 2

p' 3 P 2s 2p3 2p3 3 P° 2, 1,0 75256. 3 2s2 2p(2P°)5d 5d 3 D° 1 5d 3 D2 2 86371. 3 25 3d X D2 2s2 2p(2 P°)3d 3d X D° 2 77680. 5 3 d3 3 86396

4s *P0 2s2 2p(2 P°)4s 4s 3 P° 0 78105. 23

11. 83

31. 30

6s

xPi 2s2 2p(2 P°)6s 6s X P° 1 86413. 96 3 Pi 3 P2 1 78117. 06 2 78148. 36 5d X F3 2s2 2p(2 P°)5d 5d X F° 3 86450

3d 3 F2 2s2 2p(2 P°)3d 3d 3 F° 2 78199. 34

16. 48

34. 40

5d X PX 2s2 2p(2 P°)5d 5d X P° 1 86491 3 F3 3 78215. 82

»f4 4 78250. 22 5d 3 P2 2s2 2p(2 P°)5d 5d 3 P° 2 86504 3 -13

Pi 1 86517

3d 3 DX 2s2 2p(2 P°)3d 3d 3 D° 1 78300. 8 69 0 3 D2 2 78307 3 d3 3 78316 6d X D2 2s2 2p(2P°)6d 6d X D° 2 87632

4s X PX 2s2 2p(2 P°)4s 4s X P° 1 78338 6d 3F2 2s2 2p(2P°) 6d 6d *F° 2 87706 7 3f8 3 87713 i 3d X F3 2s2 2p(2 P°)3d 3d X F° 3 78531 4 3d X PX 2s2 2p(2 P°)3d 3d X P° 1 78727. 91 2s2 2p(2P°) 6d 6d 3 D° 1 6d 3 D2 2 87752 21 3d 3 P2 2s2 2p(2 P°)3d 3d 3 P° 2 79311. 10 -7. 96

-4. 26

*D, 3 87773 3 Pi 1 79319. 06 0 79323. 32 7s x Pi 2s2 2p(2 P°)7s 7s X P° 1 87795. 3

4p 3 Dj 2s2 2p(2 P°)4p 4p 3 D 1 80173. 29

19. 20

30. 25

6d

x F3 2s2 2p(2 P°)6d 6d X F° 3 87807 3 D2 2 80192. 49 3 d3 3 80222. 74 6d 3 P2 2s2 2p(2 P°)6d 6d 3 P° 2 87830 3 -9

Pi 1 87839

4p X PX 2s2 2p(2 P°)4p 4p X P 1 80563. 57 0 4p 3 Si 2s2 2p(2 P°)4p 4p 3 S 1 81105. 70 6d X PX 2s2 2p(2 P°)6d 6d X P° 1 87831. 3

4p ®P0 2s2 2p(2 P°)4p 4p 3 P 0 81311. 52

14. 81

18. 15 7d 3 F2 2s2 2p(2 P°) 7d 7d 3 F° 2 88541. 8 g 3 Pi 1 81326. 33 3 f3 3 88547

»P2 2 81344. 48 *f4 4

4p X D2 2s2 2p(2 P°)4p 4p X D 2 81770. 36 2s2 2p(2 P°)7d 7d 3 D° 1o 4p X S0 2s2 2®(2 P°)4p 4p X S 0 82252. 31 7d *D3 3 88607
23

C I—Continued C I—Continued

Edl6n Config. Desig. J Level Interval Edl6n Config. Desig. J Level Interval

7d *F3 2s2 2p(2 P°)7d 7d X F° 3 88624 2s2 2p(2 P°) 9d 9d 3 D° 19 7d iP, 2s2 2p(2 P°) 7d 7d ip° 1 88682. 44 9d 3 D3 3 89514

7d *P2 2s2 2p(2 P°)7d 7d 3 P° 2

i 88689 9d iF, 2s2 2p(2 P°)9d 9d ! F° 3 89517

0 2s2 2p(2 P°)10d lOd 3 D° 19

2s2 2p(2 P°)8d 8d 3 F° 4 lOd 3 D3 3 89779

8d *F3 3 89081

*f2 2 89082 2s2 2p(2 P°)lld lid 3 D° 19

2s2 2p(2 P°) 8d 8d 3 D° 1o lid 3 D3 3 89968. 4 8d 3 D3 3 89146 C n (

2 P£) Limit 90878. 3 8d *F3 2s2 2p(2 P°)8d 8d X F° 3 89155 2p' iD, 2s 2

p

3 2p3 1 D° 2 [97878]

8d *P2 2s2 2p(2 P°)8d 8d 3 P° 2 89158 2s 2p2

(

4 P)3s 3s 6 P 1 103541. 8 on 7

1 2 103562. 5 9A Q

0 3 103587. 3

2s2 2p(2 P°)9d 9d 3F° 4

q

2p' 3 Si 2s 2p3 2p

3 3 S° 1 105800. 5

9d

3F2 2 89450 2p' iPi 2s 2

p

3 2p3 ip° 1 [119878]

September 1947.

C i Observed Terms*

Config.

ls2 +

Observed Terms

2s2 2p

2

2s 2p3

/ 2p2

3

P

\2p2 X S 2

p

2 »D

/2p3 ®S° \2p3 3 S° 2p

3 3 P° 2p3 3 D°

ns (n> 3) np (n> 3) nd (n> 3)

2s2 2p(2 P°)nx / 3, 4s 3 P° 3, 4p 3 S 3, 4p 3 P 3-5p

3 D 3-8d 3 P° 3-lld 3 D° 3-9d 3 F°

\ 3-7

s

X P° 3-5p

X S 3-5p X P 3-5p X D 3-7d X P

0 3-6d *D° 3-9d X F°

2s 2p2

{

4 Y)nx 3s 6P

*For predicted terms in the spectra of the C i isoelectronic sequence, see Introduction.
24 SEE REVISION IN NSRDS-NBS 3, Section 3, October 1970.

C II

(B i sequence; 5 electrons) Z—6

Ground state Is2 2s2 2p

2Pi

2p

2Pf 196659. 0 cm'1 I. P. 24.376 volts

The term values for the doublets are taken from Edl6n’s Monograph. He has since re- jected his 5p' 2D term. Intersystem combinations have been observed by Edlen (1936) and

the resulting correction to the quartet terms as published in his Monograph, +19.3 cm"1

, has

been applied.

REFERENCES

A. Fowler and E. W. H. Selwyn, Proc. Roy. Soc. (London) [A] 120, 312 (1928). (T) (C L)

B. Edl6n, Nova Acta Reg. Soc. Sci. Uppsala [IV] 9, No. 6, 74 (1934). (I P) (T) (C L) (G D)

B. Edl6n, Zeit. Phys. 98, 561 (1936). (C L) B. Eld6n, private communication (Dec. 1947). (T)

C ii C II

Edl6n Config. Desig. / Level Interval Edlen Config. Desig. J Level Interval

2p 2Pj 2s2 pS) 2p 2p 2 P° K 0. 0

64. 0

5s 2 Si 2s2 OS) 5s 5s 2 S y2 173348. 18

2P2 1 X

y2

64. 0

5p

2 Pi 2s2 OS) 5p 5p

2 P° y2 175287. 9

7. 3

2p' 4 Pi 2s 2pa 2p2 4 P 43000. 2

21. 6

28. 9

2 P2 1/2 175295. 2

4 P2 iy2 43021. 8

4 p3 2/2 43050. 7 3s' 2 Pj 2s 2p(3P°)3s 3s 2P° y2 178194- 1

2 26. 7 P2 1/2 178220. 8

2p' 2 D3 2s 2pa 2p2 2 D 2K 74930. 9 -2. 3 2D2 1/2 74933. 2 5d 2 D3 2s2 OS) 5d 5d 2 D 1 H

2/2 178494. 8

2

p' 2Sx 2s 2

pa 2p2 2 S K 96494. 1 2p' 2Pj 2s 2p

a 2p2 2 P h 110625. 1 4L 2

5/ 2 F 2s2 OS) 5/ 5/ 2 F° j vy2 X 3/2 } 178956. 46

2P2 110666. 3

6s 2 Si 2s2 OS) 6s 6s 2 S X 181258

3s 2 Si 2s2 OS) 3s 3s 2 S 116537. 88

3p' 4 Dx 3p

4 D 181694. 50

14. 70

25. 01

36. 27

2s 2p(3 P°)3p X

3P 2P2s»(*S)3p 3p

2P° 181724. 68

11. 13

4 D2 1/2 181709. 20

2P2 1/2 131785. 81 4 d3 2/2 181734. 21

4 d4 3/2 181770. 48

2p" 4 S2 2p

3 2

p

3

S° 1/2 142024. 4 u/2 3p' 2Pi 2s 2p(3 P°)3p dp 2 P X 182025. 0

19. 5 3d 2 D2 2D3 2s2 OS) 3d 3d 2 D 145549. 99

145551. 44 1. 45

2 P2 1 X 182044. 5 2K

2s2 0S)6d 6d 2 D 1/2 2p" 2D3 2p

3 2p3 2 D° 2H 150462. 8 -5. 1 6d 2 D3 2/2 184064. 9

2 d2 1/4 150467. 9

/ 2/2 4s 1 3/2 2Si 2s2 OS) 4s 4s 2 S 157234. 43 6/ 2 F 2s2 OS) 6/ 6/ 2 F°

| 184376. 20

4p2Pj 2s2 OS) 4p 4p 2P° F2 162518. 70

5. 92

3p' 4S2 2s 2p(3 P°) 3p 3p

4 S 1/2 184688. 69

2P2 1/2 162524. 62

3p' 4 Px 2s 2p (

3 P°)3p 3p4 P / 186425. 02

16. 30

22. 43 3s' 2s 2p(3P°)3s 3s 4P°

1 K2 166964 70

23. 76

44. 97

4 P2 1/2 186441. 32

4P2 4p3 166988. 46

167088. 48

4 Ps 2/2 186463. 75

2H

3p' 2 D2 2s 2p(3 P°)3p 3p

2 D 1 X 188579. 3

33. 4

4d

2 D2

2 D3 2s2 0S)4d 4d 2 D 1 X

2/2 168123. 92

168124. 33 0. 41

2 d3 2/2 188612. 7

3p

f 2 Sx 2s 2p(3 P°)3p 3p

2 S X 194571. 9 2p" *Pj 2p

3 2p3 2P° K 168781. 6

18. 6 2P2 1JS 168750. 2 3d' <F2 2s 2p(3 P°)3d 3d 4 F° 1/2 195750. 8 14 3

19. 6

27. 6

4 f3 2/2 195765.

4/8F 2s2 OS) 4/ 4/ 2 F° / 2/2 1 3/ | 168979. 05

4f4

4f5 3/2

4/2 195784. 7 195812. 8
25

C II

Continued C n—Continued

Edl6n Config. Desig. J Level Interval Edl6n Config. Desig. J Level Interval

3d' 4 Dj 2s 2p(3 P°)3d 3d 4 D° K 196556. 2

5. 6

8. 7

10. 3

4d' 2 F4 2s 2p (

3 P°)4d 4d 2 F° 2 K

4 D2 IK 196561. 8 3K 221502

4 d3 2/2 196570. 5

4 D4 3H 196580. 8 4/' 4 G3 2s 2p(3 P°)4/ 4/ 4 G 2)4 221543. 0

10. 2

21. 3

29. 1

4 G4 3K 221553. 2 C m OSo) Limit 196659. 0

4 G6 4K 221574 5

4 g6 5K 221603. 6

3d' 2 D2 2s 2p(3 P°)3d 3d 2 D° IK 198426. 4 10. 8

4/ 3 d3 2/2 198437. 2 4/' 2 G 3K 2 G4 2s 2p(3P°)4/ 221585 43 2 g5 4K 221628

3d' 4 P3 2s 2p(3 P°)3d 3d 4P° 2K 198842. 0 -21. 5 -14. 2

2s 2p(3 P°)4/ 4/ 4 Po IK 198863. 5 4

4 D 3K 221696. 5

/' 4D4 -30. 9 -18. 9

4 Pi k 198877. 7

4 d3 2K 221727. 4

4 d2 IK 221746. 3

3d' 2 F3 2s 2p(3 P°)3d 3d 2F° 2/2 199941. 4 42. 8 K

2 f4 3)4 199984 2

4/' 2 D3 2s 2p(3 P°)4/ 4/ 2 D 2K 221707. 9 -45. 0

3d' 2 P2 2s 2p (

3P°)3d 3d 2 P° 1/2 202180. 3 -24. 1

2 d2 IK 221752. 9

2 Pi K 202204. 4

4d' 2 P2 2s 2p(3 P°)4d 4d 2 P° IK 222259. 1 -26. 9

4s' 4 P, 2s 2p(3 P°)4s 4s 4P° K 209550. 26

24. 02

2 Pi K 222286. 0

4 P2 1)4 209574. 28

46. 08

5s 4 P° K

IK

2K

4 p3 2)4 209620. 36 2s 2p(3 P°)5s

4p' 2Pj 2s 2p(3 P°)4p 4p

2 P K 214406. 6

23. 1 5s' 4P3 225813

2 P2 1/2 214429. 7

; K

4p' 4 Dx 2s 2p(3P°)4p 4p l IK 4 D K 214758. 3 14 3

5p' 2 P 2s 2p(3T°)5p op 2 P

}

227901

4 D2 1)4 214772. 6

22. 0

33. 4

4 d3 2)4 214794. 6 2s 2p(3 P°)5d 5d 4 D° K

4 d4 3)4 214828. 0 IK

2K

4p' 4 S2 2s 2p(3 P°)4p 4p

4 S 1)4 215765. 6 5d' 4 D4 3K 230763

2s 2p(3P°)4p 4p 4P )4 5d' 4 P3 2s 2p(3P°)5d 5d

4P° 2K 231050

4p' 4P2 1)4 216378. 0

19. 7 IK

4p3 2)4 216397. 7 K

4p' 2 D3 2s 2p(3 P°)4p 4p

2 D 1)4 2K 216927

5/' 2F 2s 2p(3 P°)5/ 5/ 2 F

f 2K

l 3K }

231221

4d' 4F2 2s 2p(3 P°)4d 4d 4F° IK 219553. 8 ia 7

2s 2p(3 P°)5/ 5/ 4F IK

4f3 2K 219568. 5

20. 7

27. 8 2K

4 f4 3K 219589. 2 3K

4f5 4K 219617. 0 5/' 4F* 4K 231226. 8

2s 2p(3 P°)4d 4d 4 D° K 2s 2p(3 P°)5/ 5/ 4 G 2K

4d' 4 D2 IK 220127. 8

9. 2

10. 6 3K

4 d3 2K 220137. 0 4K

4 d4 3K 220147. 6 5/' 4 G6 5K 231499. 3

4d' 2 D2 2s 2p(3 P°)4d 4d 2 D° IK 220601. 1

13. 1 5/' 4 D4 2s 2p (

3 P°)5/ 5/ 4 D 3K 231520. 4

2 d3 2K 220614. 2 2K

IK

4d' 4P3 2s 2p(3 P°)4d 4d 4P° 2K 220808. 47 9n K

4p2 4Pi IK

K

220828. 97

220840. 87

-11. 90

2s 2p(3P°)6d 6d 4 D° K

IK

4/' 2 F3 2s 2p(3P°)4/ 4/ 2F 2K 221089. 6

9. 2 2K

2 f4 3K 221098. 8 6d' 4 D4 3K 236444

2s 2p(3 P°)4/ 4/ 4F IK 6d' 4P* 2s 2p(3 P°)6d 6d 4P° 2K 236605

2K IK

4/' 4 F4 3K 221106. 3

1. 1 K

4 f5 4K 221107. 4

December 1947.
26

C ii Observed Terms*

Config.

1s

2 ±

Observed Terms

2s2 OS) 2p 2p 2P°

2s 2p2 { 2p22S

2p2 4 P

2p2 2P 2p2 2 D

2p

3 |

2p3 4 S°

2p3 2 P° 2p3 2 D°

ns (n>3) np (n> 3) nd (n> 3) nf (n> 4)

2s2

(

1 S)rw; 3-6s 2 S 3-5p

2 P° 3-6d 2 D 4-6/ 2 F°

2s 2p(3P

0

)rcx

f 3-5s 4P° 3, 4p 4 S 3, 4p 4 P 3, 4p 4 D 3-6d 4 P° 3-6d 4 D° 3, Ad 4 F° 4, 5/ 4 D 4, 5/ 4 F 4, 5/ 4 G

\ 3s 2 P° 3p 2 S 3, 5p 2 P 3, 4p 2 D 3, 4d 2 P° 3, 4d 2 D° 3, 4d 2 F° 4/ 2 D 4, 5/ 2 F 4/ 2 G

*For predicted terms in the spectra of the B i isoelectronic sequence, see Introduction.

Cm

SEE REVISION IN NSRDS-NBS 3, Section 3, October 1970.

(Be i sequence; 4 electrons) Z=

6

Ground state Is2 2s2 J S0

2s2 % 386159. 7 cnr1 I. P. 47.864 volts

All but three terms are from Edl6n’s Monograph. For the terms 7d

3D, 8d 3D, and 9d

3 D

the revised values of Whitelaw and Mackhave been used. Edlen has since rejected his 4d' *P term.

No intersystem combinations have been found with certainty. The long D-series determine

the limits to about ±25 cm-1

. The uncertainty x in the relative positions of the singlets and

triplets is, therefore, less than ±50 cm-1 according to Edl6n. No trace of the line predicted

at 1910.7 ±2 A, 2s2 ^o—2p 3P?, is visible on his plates. A line observed at 339 A (294314.1

cm-1

) agrees within 4 cm-1 with the calculated combination 2p 3 Pj—

d

1 D2

. This identification

is uncertain, since it is not confirmed by other intersystem combinations.

REFERENCES

B. Edl6n, Nova Acta Reg. Soc. Sci. Uppsala [IV] 9, No. 6, 51 (1934). (I P) (T) (C L) (G D)

N. G. Whitelaw and J. E. Mack, Phys. Rev. 47, 677 (1935). (T) B. Edl6n, private communication (Dec. 1947). (T)

C III C ill

Edl6n Config. Desig. J Level Interval Edlen Config. Desig. J Level Interval

2s »S0 2s2 2s2 4 S 0 0. 0 2p

f 4 D2 2p

2 2p2 J D 2 145875. 1

2p 8 P

2s (

2S) 2p 2p 3P° 0 52815. 0+x 23 0

2p' 2 So 2p

2 2p2 4 S 0 182520. 2

3 P1 1 52338. 0+x

3 P2 2 62394• 8+x 3s »Sj 2s (

2 S) 3s 3s 3 S 1 238160. 7+x

2p

2 P, 2s(2S)2p 2p

4 P° 1 102851. 4 3s ! So 2s(2S)3s 3s 4 S 0 247169. 5

2

p' 2P

2p

2 2p2!P 0 137374. 0±z 29 4 3p *P, 2s(2 S)3p 3p »P° 1 258931. 4

3Pi 1 137403. 4±x 47 1

3 P* 2 137450. 5±x
27

C in—Continued C HI—Continued

Edl6n Config. Desig. J Level Interval Edl6n Config. Desig. J Level Interval

3v

3 Po 2s (2 S) 3p 3p 3 P° 0 259658. 8+x 5 5

2s(2 S)5d 5d *D 1

3 Pi 1 259659. 3+x 12. 8

2

3 P2 2 259672. 1+x 5d *D3 3 345444 +x

3d 3 DX 2s(2 S)3d 3d *D 1 269957. 6+z 2. 1

3. 2

2s (

2S) 5g 5*7

3 G 3

3 D2 2 269959. 7+x 5<7 3 G4 4 346525. 1+x

3 0. 9 d3 3 269962. 9+x 3 g6 5 346526. 0+x

3d *D2 2s (2 S) 3d 3d iD 2 276482. 7 5*7*01 2s(2 S)5g 5g *G 4 346577. 5

3s' 3 P„ 2p(2P°)Ss 3s 3 P° 0 808162. 9+x 33. 3

68. 6 5d *D2 2s(2 S)5d 5d *D 2 346656. 0

3 Pi 1 308196. 2+x

3P2 2 808264. 8+x 3d' *P, 2p(2 P°)3d 3d *P° 1 S-4077S. 1

4s 3 Si 2s(2 S)4s 4s 3 S 1 309404. 5+x 5/ 3 F2 2s(2 S)5/ 5/ 3 F° 2 847099. 5+x 1. 8

2. 4

*f3 3 347101. 3+x

3s' J Pi 2p(2 P°)3s 3s *P° 1 310005. 2 3 f4 4 347108. 7+x

4s »S0 2s(2 S)4s 4s iS 0 311720. 7 5/*F3 2s(2 S)5/ 5/ *F° 3 848859. 5

4p

3P01 2s(2 S)4p 4p 3P° 0,1 817748 +x 6s 3 Si 2s(2 S)6s 6s 3 S 1 354796 +x

*p2 2 317748 +x

6v 'Pi 2s(2 S)6p 6p *P 0 1 357088

3

p' iPi 2p(2 P°)3p 3p iP 1 319719. 4

2s(2 S)6d 6d 3 D 1 4d 3 D! 2s(2S)4d 4d 3 D 1 321358. 8+x 16. 3

23. 5

2

8 D2 2 321375. 1+x 6d 3 D3 3 358046 +x

*d3 3 321398. 6+x

2s (

2 S) 6g 6g*G 3

4/ 3 F2 2s (

2 S)4/ 4/ 3 F° 2 821949. 1 +x 6. 7

8. 9

6gf 3 G4 4 358638. 3+x

0. 7 *f8 3 821955. 8+x 3 g6 5 358639. 0+x

*F4 4 821964. 7+x

6^*G4 2s (

2 S) 6*7 6g *G 4 358688. 9 4p

J Pi 2s(2 S)4p 4p *P° 1 322403. 1 6d *D2 2s(2 S)6d 6d *D 2 358725. 5 4/*F8 2s(2 S)4/ 4/ 1F° 3 822701. 1 6/ 2s(2S)6/ 3 F° 2

3

p' *Di 2p(2P°)3p 3p 3 D 1 323024. 0+x 25. 4

38. 8

3

3 D2 2 323049. 4+x 6/ 3 F4 4 858800 +x

*d3 3 323088. 2+x

2s(2 S)6/ 6/ 6/ *F3

1 F° 3 S52722. 2

4d »D2 2s(2 S)4d 4d iD 2 324212. 0

7s 3 SX 2s(2 S)7s 7s 3 S 1 363561 +x

3

p' 3S! 2p(2 P°)3p 3p *S 1 327225. 7+x

7v

J Pi 2s(2S)7p 7p *P° 1 864896

3

p' 3P0 2p(2 P°)3p 3p 3P 0 329633. 1+x 21. 1 36. 7

•Pi 1 329654. 2+x 7d 3 D 2s (

2 S) 7d 7d 3 D 1, 2,3 365585 +x

3P2 2 329690. 9+x

7d *D2 2s(2 S)7d 7d *D 2 366027. 0

3d' *D2 2p(2P°)3d 3d iD° 2 332690. 3

8v 'Pi 2s (

2 S) 8p 8p *P° 1 869926

3p' *D2 2p(2P°)3p 3p *D 2 333116. 4

8d 3 D 2s(2 S)8d 8d 3 D 1, 2,3 370438 +x

3d' *F2 2p(2 P°)3d 3d 3 F° 2 838383. 4+x 25. 0

36. 6 *f3 3 883358. 4+x 9d 3 D 2s(2 S)9d 9d 3 D 1, 2,3 373748 +x

3 F4 4 333895. 0+x

3d' *D! 2p (2P°)4s 4s 3 P° 0 2p(2P°)3d 3d 3 D° 1 837602. 9+x 13. 5

20. 3

1

3 D2 *d3 2

3 337616. 4+x337636. 7+x

4s' 3P2 2 +x

5s 3Si 2s(2 S)5s

4p' *Pi 2p(2 P°)4p 4p *P 1 381104. 8

5s 3 S 1 339881 +x

1 3d' 3 P2 2p(2 P°)3d

2p(2P°)4p 4p 3 D

3d 3 P° 2 840049. 5+x -26. 3 -14. 5

4p' 3 D2 2 381919 +x

3 39 P, 1 340075. 8+x 3 d3 3 381958 +x

3 Po

3d' »F, 2p(2P°)3d

0 340090. 3+x

2p(2 P°)4p 4p 8P 0 3d iF° 3 841368. 5 4p' 3 Pi 1 384313 +x 37

5p iPj

. 3 P2 2 384350 +x

2s(2S)5p 5p 1 P° 1 348255. 7

2s(2 S)5p

4p' *D2 2p(2 P°)4p 4p *D 2 385637. 5

5p »P° 0 5p 3P2 1 4d' *D2 2p(2 P°)4d 4d *D° 2 385816. 2

2 344181 +x

Civ(2 Sh) Limit 386159. 7

3p' 1S0 2p(2 P°)3p 3p iS 0 345093. 9
28

C in—Continued C III—Continued

Edl6n Config. Desig. J Level Interval Edlen Config. Desig. J Level Interval

2p(2P°)4d 4d 3 D° 1 bd' 3 P2 2p(2 P°)5d bd 3P° 2 410841 +3

2 1 4d' 3 Dg 3 +x 0

4d' 2P2 2p(2 P°)4d 4d 3P° 2 888443 +x 2p(2P°)6p bp 3 D 1

1 2

0 bp' 3 D3 3 421380 +x

4d' »F3 2p(2 P°)4d 4d J F° 3 888772. 2 2p(2P°)6p bp 3P 0

1 bp' J Pi 2p(2 P°)5p bp »P 1 407430. 4 bp' 3 P2 2 421967 +x

2p(2 P°)5p bp 3 D 1 2p(2P°)6d bd 3 D° 1 2 2

bp' 3 D3 3 407774 +x bd' 3 D3 3 422881 +x

2p(2P°)5p bp 3 P 0 bd' 3 P2 2p(2 P°)6d bd 3 P° 2 428058 +x

1 1 bp' 3 P2 2 408873 +x 0

bp' j D2 2p (

2 P°)5p bp J D 2 409505. 0 2p(2 P°)7p 7p »D 1o

bd' j D2 2p(2 P°)5d bd iD° 2 409682. 1 7p' 2 D3 3 429345 +x

2p(2 P°)5d bd 8 D° 1 2p(2 P°)7p 7p 3 P 0

2 1 bd' 3 D3 3 410534 +x 7p' 3 P2 2 429712 +x

December 1947.

C hi Observed Terms*

Config.

ls2 +

2s2 2s2 *S

Observed Terms

2s(2S)2p

2p2 2p2 »S

2p

3 P°

2p

X P°

2p2 3 P

2p2 iD

2s(2 S)nx

2p(2T°)nx

ns (n>3) np (n> 3) nd (n> 3) nf (n> 4) ng (n>5)

/3-7s 3 S 3-bp 3 P° 3-9d 3 D 4-6/ 3 F° 5, bg 3 G

13, 4s 3-8p iP° 3-7d !D 4-6/ !F° 5, bg iG

/ 3, 4s 3 P° 3p 3 S 3-7p

3 P 3-7p3 D 3-6d 3 P° 3-6d 3 D° 3d 3 F°

\ 3s 1 P° 3p »S 3-5p *P 3-5p *D 3d 1 P° 3-5d »D° 3, 4d iF°

*For predicted terms of the Be i isoelectronic sequence, see Introduction.
SEE REVISION IN NSRDS-NBS 3, Section 3, October 1970.

Civ

29

(Li i sequence; 3 electrons) Z=6

Ground state Is2 2s 2S§

2s 2S± 520177.8 cm-1

I. P. 64.476 volts

The terms are from Edlen. His extrapolated values of three intervals and the term values

of the two high series members 8/

2F° and 8g2 G, etc., which were calculated from a well-determined series formula, are entered in brackets in the table.

REFERENCES

B. EdlSn, Zeit. Astroph. 7, 378 (1933). (T) (C L) B. Edl6n, Nova Acta Reg. Soc. Sci. Uppsala [IV] 9, No. 6, 40 (1934). 0 P) (T) (C L) (G D)

T.-Y. Wu, Phys. Rev. 58, 1114 (1940). (C L)

C iv C iv

Edlln Config. Desig. J Level Interval Edl4n Config. Desig. J Level Interval

2s *Si 2s 2s 2 S Yi 0. 0 6d 2 D 6d 6d 2 D f 1Y

l 2/ }

471368

2v

2Pi 2V 2p

2 P° Y 6U81 2

[107. 1 2 P2 1Y 64591. 3

6/ 2 F 6/ 6/ 2 F° / 2/2

l 3Y } 47140s. 0

3s »Si 3s 3s 2 S Y 302847. 9 3p *P, 3V 3p

2 P° Y 820048. 5

[31. 5

6<7 2 G 6? 6g

2 G J $Y

i 4/ } 471407.

2 P2 1Y 820080. 0

/ 4/

3d 1 5/2 2 D2 2 D3 3d 3d 2 D 1Y

2Y

324880. 2

324890. 9

[ID. 7] 6h

2 H 6h 6h2 H°

} 471407.

7s 2 SX 7s 7s 2 S Y 482659

4s »Si 4s 4s 2 S Yi 401346. 7 4p *Pj 4p 4p 2 P° Y 408308. 9

13. 3 7p

2 P 7p 7p2P° J Y

l 1/2 }

483931

2 P2 1Y 408322. 2

/ 1 /

4d l 2/

2 D2 4d 4d 2 D 1Y 410333. 8

4. 4

7d 2 D 7d 7d 2 D

}

484309

2 d3 2/2 410338. 2

4/ s F4 4/ 4/ 2 F° 2Y

3Y 410434. 1 [2.1]

7/ 2 F 7/ 7/ 2 F° / 2/

l 3/ } 48434S. 8

5s 2 Si 5s 5s 2 S Y 445366. 1 7g

2 G 7g 7g 2 G / 3Y

X 4/ } 484346. 6

5p 2PX 2 P2 5p 5p 2 P° Y

1Y

448854

448861 [6. 7] 7h

2 H 7h 7h

2 H° (

4/2

l 5/ | 484346.

5d 2 D3 5d 5d 2 D 1Y

2Y 449887. 4

[2.2] 8p

2 P 8p 8p

2 P° / Y

X lY |

492473

5/ 2 F 5/ 5/ 2F° f 2Y

X 3Y | 449938. 2 8F 8/ 8/ 2F° / 2/

l 3/ | [492748]

5g 2 G 5g 5^ 2 G J 3Y

l 4/2 | 449948. 4 8GHIK 8g, etc. 8g2 G, etc.

f 3/

< to

1 7/2

\ [492745]

6s 2 SX 6s 6s 2 S Y 468765

J

6p 2 P 6p 6p 2P° { Y

l 1/2 }

470763 C v (»S0) Limit 520177. 8

April 1946.
30 SEE REVISION IN NSRDS-NBS 3, Section 3, October 1970.

Cv

(He i sequence; 2 electrons) Z=6

Ground state Is2 JS0

Is2 'So 3162450 ±300 cm"1 I. P. 391. 986 ±0.037 volts

The singlet terms are from Tyr6n, who has reported (1940) nine lines visible on his spectrograms. His limit has been calculated from the series members n—2 to 6. The remaining singlet

terms have been calculated from three classified lines at 32 A given in his 1936 paper. He has

also classified a line at 40.731 A as the intersystem combination Is2 ^o—2p 3Pj. His unit, 103 cm-1 has here been changed to cm-1

. The triplet terms are from an unpublished manuscript kindly furnished by Edl6n, who

states that the absolute term values of the triplets are based on an extrapolation of 3d 3 D from

He i and Li ii. The relative positions of the singlet and triplet terms thus determined confirm

the intersystem combination reported by Tyr6n.

REFERENCES

B. Edl6n, Nova Acta Reg. Soc. Sci. Uppsala [IV] 9, No. 6, 31 (1934). (C L)

F. TyrSn, Zeit. Phys. 98, 774 (1936). (C L) H. A. Robinson, Phys. Rev. 51, 14 (1937). (I P) (T) (C L)

F. Tyr6n, Nova Acta Reg. Soc. Sci. Uppsala [IV] 12, No. 1, 24 (1940). (I P) (T) (C L) B. Edl6n, unpublished material (Sept. 1947). (T)

Cv Cv

Config. Desig. J Level Interval Config. Desig. J Level Interval

Is2 Is2 iS 0 0 Is 4p 4p

ip° 1 2991680

Is 2s 2s 3 S 1 2411266 Is 5p 5p

J P° 1 3053060

Is 2p 2p

3 P° 0 2455165 -13

136

Is 6p 6p

ip° 1 3086420

1 2455152

2 2455288 Is 7p 7p

1 P° 1 3106750

Is 2p 2p »P° 1 2483240 Is 8p 8p »P° 1 3118760

Is 3d 3d 3 D 3, 2,1

1

2857308

Is 3p 3p ‘P0 2859350 C vi (2 S*) Limit 3162450

September 1947.
SEE REVISION IN NSRDS-NBS 3, Section 3, October 1970.

C VI

31

(H sequence; 1 electron) Z—6

Ground state Is 2S^

Is 2S^ 3951950 cm-1

I. P. 489.84 volts

The first three members of the Lyman series have been observed by Tyren. The terms

listed below have been calculated by J. E. Mack, “using Rc12=109732.286 and A=0.040. The

series limit of C

13 is higher by 14.0 cm-1 than the one shown here.”

REFERENCES

F. Tyr6n, Zeit. Phys. 98, 771 (1936). (C L)

J. E. Mack, unpublished material (1949). (I P) (T) (C L)

C VI C vi

Config. Desig. J Level Interval Config. Desig. J Level Interval

4p 4p

2 P° X 3704957 11 ^ Is Is 2 S Yz 0 4s 4s 2 S Y* 3704961

4p, 4

4d 2 D, 4p

2 P° IX 3705016 -i i oy. 2p 2p

2 P° Yz 2963768 1"1 38 4d, 4/ 4d 2D, 4/ 2 F° 2X 3705035 iy. / 2s 2s 2 S y

2963806 473 3 4/ 4/ 2F° 3X 3705045 y. y

2p 2p 2P° 1/2 2964241

5s, etc. 5s 2 S, etc. X,etc. 3793884

3v 3v

2 P° 3512811 11 11 to 933

3s 3s 2 S % 3512822 M 140 3 3p 3

3d 2 D, 3v

2P° i y2 3512951

3d 3d 2D' 2y2 3512998

J 46. 7 oo= Limit 3951950

February 1949.
32

NITROGEN

Nl

7 electrons Z=

Ground state Is2 2s2 2p3 4Si£

2p3 4S?§ 117345 cm-1

I. P. 14.54 volts

The terms have been taken chiefly from the list prepared by Ekefors with extensions

calculated from the classifications published in Tokyo. Unfortunately, no term list was included in the Tokyo papers. Consequently, considerable editing has been done in compiling

terms from all the observational material. Revised values are suggested for a few levels and

tentative values not in the literature are listed for 5d

4F2 *

, 5d 4Fi* , 5d 4D3

i

, and 6d

4D3 ^. Further

study is needed to verify the numerous blends resulting from practically coincident levels. Intersystem combinations have been observed.

Kiess and Shortley have generously furnished g-values derived from the observed Zeeman

effects of 18 infrared fines.

REFERENCES

0. S. Duffendack and R. A. Wolfe, Phys. Rev. 34, 409 (1929). (C L)

S. B. Ingram, Phys. Rev. 34, 421 (1929). (T) (C L)

E. Ekefors, Zeit. Phys. 63, 437 (1930). (I P) (T) (C L)

H. E. White, Introduction to Atomic Spectra p. 260 (McGraw-Hill Book Co., Inc., New York, N. Y., 1934). (G D)

B. Edl6n, Bergstrand’s Festkskrift p. 135 (1938). (C L)

M. Kamiyama, Sci. Papers Inst. Phys. Chem. Research (Tokyo) 36, No. 933, 375 (1939). (C L)

M. Kamiyama and T. Sugiura, Sci. Papers Inst. Phys. Chem. Research (Tokyo) 37, Nos. 982 and 983, 479

(1940). (CL)

M. Kamiyama and H. Noguchi, Sci. Papers Inst. Phys. Chem. Research (Tokyo) 39, No. 1100, 475 (1942). (C L)

J. R. Holmes, Phys. Rev. 63, 41 (1943). (I S)

W. F. Meggers, J. Opt. Soc. Am. 36, 431 (1946). (Summary hfs) C. C. Kiess and G. Shortley, J. Research Nat. Bur. Std. 42, 190, RP1961 (1949). (Z E)

Nl N

Config. Desig. J Level Interval Obs. g Config. Desig. / Level Interval Obs. g

2s2 2

p

3 2p3 4S° IK 0 2s 2p4 2p4 4 P 2K 88109. 5 -43. 9 -19. 6 IK 88153. 4

2s2 2p3 2p

3 2 D° 2M

1 K

19223

19231

-8 K 88173. 0

2s2 2p2

(

3P) dp 3p 2 S° K 93582. 3

2s2 2p3 2p3 2 po f IK

i K }

28840 2s2 2p2

(

3 P)3p 3p

4 D° K 94772. 2 99 fi 0. 002

K

IK 94794- 8

37. 3

51. 0

1. 19

2s2 2p2

(

3P)3s 3s 4P 83285. 5

33. 8

46. 7

2. 670 2K 94832. 1 1. 36

IK 83319. 3 1. 735 3K 94883. 1 1. 44

2K 83366. 0 1. 603

2s2 2p2

(

3P)3p 3p4 P° K 95476. 5

18. 4

38. 3

2. 671

2s2 2p2

(

3P)3s 3s 2P K 86131. 4

91. 8 IK 95494. 9 1. 737

IK 86223. 2 2K 95533. 2 1. 598
33

N I—Continued

N I—Continued

Config. Desig. J Level Interval Obs. g Config. Desig. J Level Interval

2s2 2p2 (3 P)3p 3p 4 S° iz 96751. 7 2. 004 2s2 2p2 (3 P)4d 4d 4 P z 110325 26

52 1/2 110351

2s2 2p2 (3 P)3p 3p 2 D° IZ 96788. 2 76.0 2 Z 110403 2/ 9686^ 2

2s2 2p2 (3 P)4d 4d 2 D iz 110448. 3 22. 2

2s2 2p2 (3 P)3p 3p 2 P° Z 97770. 1 35 7 2Z 110470. 5

1/2 97805. 8

2s2 2p2 (1 D)3p 3p' 2 D° 1/2 110521. 9

23. 9

2s2 2p2 ( 1 D)3s 3s' 2 D 2 / 99665 7 2Z 110545. 8 1 X 99658

2s2 2p2 (1 D)3p 3p' 2 P° X 112294. 8

26. 0

2s2 2p2 (3 P)4s 4s 4 P /2 103618. 1 50. 0

68. 7

1/2 112320. 8

1/2 2/2 103668. 1 103736. 8 2s2 2p2 (3 P)6s 6s 4 P z 112565. 9

44. 7

72. 0

1/2 112610. 6

2s2 2p2 (3 P)4s 4s 2 P /1 X

104142. 2 104227. 4

85. 2

2/2 112682. 6

2s2 2p2 (3 P)6s 6s 2 P z 112735

88

2s2 2p2 (3 P)3d 3d 2P 1/2 104615. 4 .39 51/2 112823

/2 104654. 9

2s2 2p2 (3 P)5d 5d 4F 1/2 112751?

1236

63

2s2 2p2 (3 P)3d 3d 4F 1/2 104665 1 

2 Z 112763?

2/2 104684 34

49

3/2 112799

3/2 4Z

104718

104767

4/ 112862

2s2 2p2 (3 P)5d 5d 2 P 1/2 112801 -15

2s2 2p2 (3 P)3d 3d 2 F 2Z

3/

104810. 9

104882. 7

71. 8 z 112816

2s2 2p2 (3 P) 5d 5d 2 F 2Z 112820

70 2s2 2p2 (3 P)3d 3d 4 P Z 104864 26 3Z 112890. 2

1/2 104890 67 2Z 104957 2s2 2p2 (3 P)5d 5d 4 D z

1/2 2s 2Z 2 2p2 (3 P)3

3d 4 D /2 104987 1 

112825

67

1/2 104998 139

3/2 112892?

2/2 105011

3/2 105020 2s2 2p2 (3P)5d 5d 4 P z 112855 19 iz 112874

2s2 2p2 (3 P)3d 3d 2 D 1/2 2/2 105120. 8

105144. 3

23. 5

2/2 112912 08

2s2 2p2 (3 P)5d 5d 2 D 1/2 112929. 2

18. 3

2s2 2p2 (3 P)4p 4p 2 S° Z 106478. 6 2Z 112947. 5

2s2 2p2 (3 P)4p 4p 4 D° X 106760. 5

19. 6

36. 0

54. 6

2s2 2p2 (3 P) 7s 7s 4P z 114015? 57

74

1/2 106780. 1 1/2 114072?

2/2 106816. 1 2Z 114146

3/ 106870. 7 4p 4 P°

2s2 2p2 (3 P)7s 7s 2 P z 114130 33 2s2 2p2 (3 P)4p z 106982. 7 1 p; r iz 114163

1/2 106998. 3

40. 7

2/2 107039. 0 f 1/2 1 2s2 2p2 (3P)6d 6d 4F i to 114160

2s2 2p2 (3 P)4p 4p 4 S° 1/2 107447. 2 1 4/2 J 2s2 2p2 (3 P) 5s 5s 4 P z 109813. 5 A.A. 2 2s2 2p2 (3 P)6d 6d 4 D z

1/2 109857. 8

70. 1 1/2 2/2 109927. 9 2Z

3/2 114182

114248? 66

2s2 2p2 (3 P)5s 5s 2 P z 110029. 2

79. 3

1/2 110108. 5 2s2 2p2 (3 P) 6d 6d 2 P 1/2z

114193

114209 -16

2s2 2p2 (3 P)4d 4d 4F 1/2 110196 18

34 2/2 110214 2s2 2p2 (3 P) 6d 6d 2 F 2/2 114196

79 3/2 110248 56 3/2 114275

4/2 110304

2s2 2p2 (3 P) 6d 6d 2 D 1/2 114232. 2

58. 3 2s2 2p2 (3 P)4d 4d 4 D z 110221 54

13

51

2Z 114290. 5

1/2 110275

2Z 110288 2s2 2p2 (3 P)6d 6d 4 P z

3>2 110339 1/2 2/2 114259

114274 15

2s* 2p2 (3 P)4d 4d 2 P 1/2 110221. 7 -22. 9 z 110244. 6 2s2 2p2 (3 P)8s 8s 4 P z 114809 81

2s2 2p2 (3 P)4d

iz 114890

4d 2F 2/2 110311

62 2Z 114942 52

3Z 110373
34

N I—Continued N I—Continued

Config. Desig. J Level Interval Obs. g Config. Desig. J Level Interval

2s2 2p2 (

3 P) 8s 8s 2 P J K

i ik |

114950 2s2 2p2

(

3 P)lls 11s 2 P 1 y2 l IK j- 116107

f K I f K I 2s2 2p2 (

3 P)7

7d 4 D < to \ 114988 2s2 2p2

(

3 P)lls 11s 4 P { to \ 116124

l 3K 1 l 2K J

2s2 2p2 (

3 P)7

7d 2 F / 2/2 l 3/2 }115004 2s2 2p2 (

3 P)10d lOd 2 P J IK

l K }

116155

2s2 2p2

(

3 P) 7d 7d 2 P J I /2 l K }

115017 2s2 2p2

(

3 P)10d lOd 2 F J 2 /

l 3K }

116159

2s2 2p2

(

3 P)7d 7d 2 D ik 115057. 5

42. 6 f K 1 2 / 115100. 1 2s2 2p2

(

3 P)10d lOd 4 D \ to \ 116164

1 3K J 2s2 2p2

(

3 P) 7d 7d 4 P /2

J IK

l 2K

1 /

2/ 115103 2s2 2p2

(

3 P)10d lOd 2 D

}

116240

2s2 2p2

(

3 P)9s 9s 2 P / k

1 ik }

115480

2s2 2p2

(

3 P)10d lOd 4 P

j ^2 { to \ 116259

l 2/ 1 r k I ; k

l IK

2s2 2p2

(

3 P)9s 9s 4 P { to

1 2/2

\ 115483

2s2 2p2

(

3 P)12s 12s 2 P } 116305

f K 1 | K I 2s2 2p2

(

3 P)8

8d

4 D 4 to \ 115524 2s2 2p2 (

3 P)12s 12s 4 P < to 116312

1 3/2 J l 2 / 1

2s2 2p2 (

3 P)8d 8d 2 P

J IK

l K }

115530 2s2 2p2

(

3 P)lld lid 2 P J IK

l K }

116351

2s2 2p2 (

3 P)8

8d

2 F / 2/

l 3/ }

115535 2s2 2p2 (

3 P) lid lid 2 F

/ 2 /

l 3K }

116359

2s2 2p2 (

3 P)8d 8d 2 D 1/2 115597 25 r k 1 2/2 115622 2s2 2p2

(

3 P)lld lid 4 D < to \ 116367

1 3/2 J

f K 1 2s2 2p2 (

3 P)8d 8d4 P ] to

1 2/2 115618

2s2 2p2

(

3 P)lld lid 2 D J IK

l 2K }

116436

2s2 2p2 (

3 P)10s 10s 2 P

J K

1 1/2 }

115842

2s2 2p2

(

3 P)lld lid 4 P

J ^2 i 116441

l 2 y I r k I 2s2 2p2 (

3 P)10s 10s 4 P < to

l 2 /

\ 115855

2s2 2p2

(

3 P)13s 13s 2 P

1 K

l 1/2 }

116467

2s2 2p2

(

3 P)9

9d 4 D

/ ^

< to

l 3/

115887 2s2 2p2

(

3 P)12d 12d 2 P / IK

1 K |

116502

J r k ) 2s2 2p2

(

3 P) 9d 9d 2 P

J I /2

l /2 }

115889 2s2 2p2

(

3 P)12d 12d 4 P { to

l 2K

\ 116581

2s2 2p2 (

3 P)9d 9d 2 F

J 2/2

l 3/ }

115902 2s2 2p2

(

3 P)12d 12d 2 D / IK

l 2K }

116625

2s2 2p2 (

3 P) 9d 9d 2 D IK

2K

115973

18 115991

N 11 (

3 P0) Limit 117345

f * I 2s2 2p2 (

3 P)9d 9d 4P { to [ 115990

1 2/

October 1947.
35

N i Observed Terms*

Config.

1 s

2 +

Observed Terms

2s1 2p* J2p*

4 S°

t 2p3 2 P° 2p3 2 D°

2s 2

p

4 2p4 4 P

ns (n> 3) np (n> 3) nd (n> 3)

2s2 2p2 (*P)na; f 3-12s 4 P

\ 3-13s 2 P

3, 4p 4 S°

3, 4p 2 S°

3, 4p

4 P°

3p

2 P°

3, 4p

4 D°

3p

2 D°

3-1 2d 4P 3-lld 4 D 3- 6d 4 F

3-12d 2 P 3-12d 2 D 3-lld *F

2s2 2p2 (

1 D)nx' 3

s' 2 D 3p' 2 P° 3p' 2 D°

*For predicted terms in the spectra of the N i isoelectronic sequence, see Introduction.

N n

(C i sequence; 6 electrons) Z—7

Ground state Is2 2s2 2p2 3P0

2p

2 3P0 238846. 7 cm"1 I. P. 29.605 volts

Edl6n has revised and extended the earlier analysis of this spectrum. The terms are all taken from his Monograph, except those from the 4/ configuration, which are from his 1936

paper, and his 3s' 3 P and 5/-terms, which he has generously furnished in a private communication.

The singlet and triplet terms are well connected by intersystem combinations but the

quintets are not so connected with the others. Edlen also suggests that by analogy with C i and 0 hi the published absolute values of the quintet terms should be decreased by about

500 cm”1. This correction has been applied in the table and should diminish the uncertainty x

appreciably.

REFERENCES

A. Fowler and L. J. Freeman, Proc. Roy. Soc. (London) [A] 114, 662 (1927). (T) (C L)

L. J. Freeman, Proc. Roy. Soc. (London) [A] 124, 666 (1929). (T) (C L) B. Edl6n, Nova Acta Reg. Soc. Sci. Uppsala [IV] 9, No. 6, 109 (1934). (I P) (T) (C L) (G D of singlets) B. Edl6n, Zeit. Phys. 98, 564 (1936). (T) (C L)

J. B. Green and H. N. Maxwell, Phys. Rev. 51, 243 (1937). (Z E)

B. Edl6n, unpublished material (Dec. 1947). (T).
36

NnN n

Edl6n Config. Desig. Level Interval Edl6n Config. Desig. / Level Interval 2p *P0 2s2 2p2 2p2 3P 0 0. 0 49 1 4p 3 SX 2s2 2p(2 P°)4p 4p 3 S 1 203532. 8

*Pi 1 49. 1 82. 2 *P2 2 131. 3 4p ! D2 2s2 2p(2 P°)4p 4p X D 2 205350. 7 2p X D2 2s2 2p2 2p21 D 2 15315. 7 3

s' 3 P

2s 2p2 (4 P)3s 3s 8 P 1 205982. 1+x 6 56. 0 P2 2 206038. 1+x 2p »So 2s2 2p3 2p2 iS 0 32687. 1 6 p3 3 206108. 7+x 70. 6

2p' 8 S2 2s 2p3 2p3 

S° 2 47167. 7+x 4p ! So 2s2 2p(2 P°)4p 4p X S 0 206327. 5

2p' 3 D3 2s 2p3 2p3 *D° 3 92237. 9

13 4 4d 3 F2 2s2 2p(2 P°)4d 4d 3 F° 2 209675. 3

64. 2 *d2 2 92251. 3 -l! 6 3 f3 3 209739. 5

*r>, 1 92252. 9 3 f4 4 209825. 3

85. 8

2p' 3 PJ2 2s 2p3 2p3 3 P° 2,1 109218. 2 -6.6 4d

x D2 2s2 2p(2 P°)4d 4d *D° 2 209926. 92

*Po 0 109224. 8

4d 3 DX 4d 3 D° 1 210239. 8

26. 5

35. 6

2s2 2p(2 P°)4d 2

p' ! D2 2s 2p3 2p3 *D° 2 144189. 1 3 D2 2 210266. 3 3 d3 3 210301. 9

3s *P0 2s2 2p(2 P°)3s 3s 3 P° 0 148909. 37 31 60

*Pi 1 148940. 97

136. 36 4d 3 P2 2s2 2p(2 P°)4d 4d 3 P° 2 210705. 4 -46. 1 3 P2 2 149077. S3 3 Pi 1 210751. 5 3 Po 0 210777. 0 —25. 5

3s »Pi 2s» 2p(2 P°) 3s 3s ip° 1 149188. 74

155129. 9

4/

x F3 2s2 2p(2 P°)4/ 4/ X F 3 211030. 90

2p' *S, 2s 2p» 2p3 3 S° 1 4/ 3 F2 2 211033. 71

23. 36

3. 96

164611. 60

2s2 2p(2 P°)4/ 4/ 3 F 3v *Pi 2s2 2p(2 P°)3p 3p X P 1 3 f3 3 f4 34

211057. 07

211061. 03

3p *Di 2s2 2p(2P°)3p 3p 3 D 1 166522. 48 60 78

»d2 2 166583. 26 4d

x F3 211104. 8

96! 19 2s2 2p(2 P°)4d 4d X F° 3 *D, 3 166679. 45

2p' *Pj 2s 2p» 2pt ipo 1 166765. 7

4/ 3 G3 3 g4 3 g52s2 2p(2 P°)4/ 4/ 3 G 345

211288. 02

211295. 65

211390. 77

7. 63

95. 12 3p *Si 2s2 2p(2 P°)3p 3p 3S 1 168893. 04

170573. 38

4d

x Pi 2s2 2p(2P°)4d 4d X P° 1 211335. 5 3p *P0 2s2 2p(2P°)3p 3p *P 0 35 25

4/ a P. 1 170608. 63

x G4 211402. 89 5& 37 2s2 2p (2 P°)4/ 4/»G 4 3 P2 2 170667. 00

174212. 93

4/ 3 D3 2s2 2p(2 P°)4/ 4/ 3 D 3 211411. 25 -4. 95

-71. 08 3p j D2 2s2 2p(2 P°)3p 3p *D 2 3 d2 3 D! 21 211416. 20

211487. 28 3p JSo 2s2 2p(2P°)3p 3p 3 S 0 178274. 17

211491. 16

186512. 38

4/

x D2 2s2 2p(2P°)4/ 4/»D 2 3d *F2 2s2 2p(2P°)3d 3d *F° 2

59 42

3s' 3 f 3 P0 0 211750. 2 3 3 186571. 80

81. 55 2s 2pJ (4 P)3s 3s 3 P 30. 4

48. 2 3 f4 4 186653. 35 a Pi 1 211780. 6 a P2 2 211828. 8

3d X D2 2s2 2p(2P°)3d 3d l D° 2 187092. 20

5s 3P0 2s2 2p(2 P°)5s 5s 3 P° 0 214212. 4 45.8

127. 1 3d »Dj 2s2 2p(2 P°)3d 3d »D° 1 187488. 34 24 04 a Pi 1 214258. 2 *d2 2 187462. 38

30! 34 aPs 2 214385. 3 3 d3 3 187492. 72

188858. 09

5s

x Pj 2s2 2p(2 P°)5s 5s *P° 1 214828. 0

3d 3 P2 2s2 2p(2 P°)3d 3d »P° 2 — 51 80

5d *Pi 1 188909. 89 3 D° -28. 06 2s2 2p(2P°)5d 1 3P0 0 188937. 95 2 5d 3 D3 3 220717

3d ! F3 2s2 2p(2 P°)3d 3d X F° 3 189336. 0

5/ 3F2 2s2 2p(2 P°)5/ 5/ 3 F 2

221070. 2

221074. 3 3d iPi 2s2 2p(2 P°)3d 3d iP° 1 190121. 15 »f3 »f4 34

4. 1 4s 3 Po 2s2 2p(2P°)4s 4s »P° 0 196541. 09 ^1 7Q 5d »P, 1 196592. 88 x F3 119. 29 2s2 2p(2P°)5d 5d X F° 3 221137. 6 3 P2 2 196712. 17

5/ 3 G3 2s2 2p(2P°)5/ 5/ 3 G 3 221227. 7 5 0

4s J Pi 2s2 2p(2 P°)4s 4s 1 P° 1 197859. 28 3 g4 3 Ge 45 221232. 7

221302. 2

69. 5 4p J Pi 2s2 2p(2P°)4p 4p X P 1 202169. 9

5/ j G4 2s2 2p(2 P°)5/ 5/

x G 4 221312. 1 4p a Di 2s2 2p(2P°)4p 4p *D 1 202714. 94

50. 92

96. 20

3p' 8 D0 3p 8 Dj 2 202765. 86 2s 2p2 (4P)3p 8 D° 0 224027. 1+x

15 8 a D3 3 202862. 06 ®I>i 1 224042. 9+x 29. 4

43. 1 53. 9

®Da 2 224072. 3+x 4p 3 Po 2s2 2p(2P°)4p 4p *P 0 203164. 7

24. 1 ®D, 3 224H5. 4+x

*Pi 1 203188. 8 70.9 6d4 4 224169. 3+x 3 P« 2 203259. 7
37

N n—Continued N II—Continued

Edl6n Config. Desig. J Level Interval Edl6n Config. Desig. J Level Interval

3p' 6 Pi 2s 2p2

(

4 P)3p 3p 8 P° 1 225987. 1+x 94 1 3d' 8 P3 2s 2p2 (

4 P)3d 3d 8 P 3 244737. 4+x QQ K

8 p2 2 226011. 2+x a a n

6 p2 2 244775. 9+x Oo. 0

6 p3 3 226055. 2+x 8 Px 1 244802. 0+x ZD. 1

3

p' 6 S2 2s 2p2 (

4 P)3p 3p 5S° 2 230223. 0+x 3d' S D0 2s 2p2 (

4 P)3d 3d 6 D 0 245319. 8+x Q A

8 Dj 1 245323. 4+x O. 0 N hi (

2 Pi) Limit 238846. 7

6 D2 2 245331. 3+x 7. y

8 d3 3 245342. 9+x 11. 0

3d' 6 Fx 2s 2p2

(

4 P) 3d 3d 5F 1 243355. 5+x 1 K 7

6 d4 4 245356. 9+x 14. U

8 F2 2 243371. 2+x A

6 f3 3 243396. 6+x QQ A

8 f4 4 243430. 2+x OO. O An a

6 f6 5 243470. 8+x

December 1947. N n Observed <7 -Values

Desig. J Obs. g Desig. J Obs. g Desig. J Obs. g

3s 3 P° 1 1. 455 3v

3 S 1 2. 015 3d iD° 2 0. 986

2 1. 502

3V 1 1. 530 3d 3 D° 1 0. 494 3 P

3s iP° 1 1. 051 2 1. 497 2 1. 114

3 1. 329

3p »P 1 1. 005 3p iD 2 1. 002

3d 3 P° 2 1. 504

3p *D 1 0. 494 3d 3 F° 3 1. 079 1 1. 487

2 1. 166 4 1. 250

3 1. 330 3d iP° 1 1. 026

N n Observed Terms*

Config.

ls2 +

Observed Terms

2s» 2P3

2s 2p®

/ 2?*?

I2p2 iS 2p» »D

f2p3 ®S°

j 2p3 3 S° 2p33P° 2p33D°

[ 2p31P° 2p® 1 D°

ns (n> 3) np (n> 3) nd (n> 3) nf (n> 4)

2s2 2p(2P°)?ix

2s 2p2

(

4 P)?jx

/ 3-5s 3 P°

l 3-5s iP°

/ 3s «P

l 3s 3P

3, 4p 3 S 3, 4p 3 P 3, 4p 3 D

3, 4p !S 3, 4p »P 3, 4p !D

3p 8 S° 3p 5 P° 3p ®D°

3, 4d 3 P° 3-5d 3 D° 3, 4d 3 F°

3, 4d !P° 3, 4d ! D° 3-5d JF 0

3d 8 P 3d 8 D 3d 8 F

4/ 3 D 4, 5f

3 F 4, 5/ 3 G

4f iD 4f

iF 4, 5/ iG

*For predicted terms in the spectra of the C 1 isolectronic sequence, see Introduction.
38

Nffl

(B I sequence; 5 electrons) Z=7

Ground state Is2 2s2 2p

2P^

2p

2Pf 382625.5 cm"1 I. P. 47.426 volts

All of the terms except those with a 4/-electron, have been taken from Edl&Ps Monograph.

In 1936 Edl6n published a revised and extended list of 4/-terms and the corresponding classified

lines, including intersystem combinations. The observed correction to his previously published quartet terms —396.4 cm-1

, connecting them with the doublet terms has been

incorporated into the present list. REFERENCES

L. J. Freeman, Proc. Roy. Soc. (London) [A] 121, 318 (1928). (T) (C L)

B. Edl6n, Nova Acta Reg. Soc. Sci. Uppsala [IV] 9, No. 6, 78 (1934). (I P) (T) (C L) (G D)

B. Edl6n, Zeit. Phys. 98, 561 (1936). (T) (C L)

N in N in

Edl6n Config. Desig. J Level Interval Edl6n Config. Desig. Level Interval

2p

2 Pi 2s2 (

1 S)2p 2p2 P° H 0. 0

174. 5

3s' 4 Pi 2s 2p(3 P°)3s 3s 4 P° / 287535. 6

62. 5

115. 8

2 P2 iy2 174. 54 P2 1/ 287598. 1

4 p3 2/ 287713. 9

2

p' 4 PX 2s 2p2 2p2 4 P / 57192. 1 59. 9

81. 2

4 P2 iy2 57252. 0 3s' 2 P1 2s 2p(3 P°)3s 3s 2 P° Z 297150. 2

4 112. 9 p3 2y2 57333. 2 2 P2 iy2 297263. 1 2

p' 2 D3 2s 2

p

2 2p2 2 D 2y2 101023. 8 -7. 7

4s 2 Si 2s2 OS) 4s 4s 2S y2 301088. 2

2 d2 i y2 101031. 5

3p' 2 PX 2s 2p(3 P°)3p 3p 2 P y2 309132. 6 53.2

2

p' 2 S1 2s 2

p

2 2p2 2 S y2 131003. 5

2 P2 1 X 309185. 8 2

p' 2 PX 2s 2

p

2 2p2 2 P y2 145876. 1 110. 4

3p' 4 DX 2s 2p(3 P°)3p 3p 4 D y2 309662. 8

35. 5

62. 2

96. 2

2 P2 iy2 145986. 5

4 D2 1 X 309698. 3

4 d3 2/ 309760. 5 2p" 4S2 2p

3 2p3 4 S° 1/2 186802. 34 d4 3/ 309856. 7

2p" 2 D3 2p3 2p3 2 D° 2/ 203072. 2 -16. 7

4p

2 PX 2s2 OS) 4p 4p 2 P° H 311691. 3

2 24. 8 d2 iy2 203088. 9

2 P2 1/2 311716. 1

3s 2SX 2s2 PS) 3s 3s 2 S y2 221302. 4 3p' 4 S2 2s 2p(3 P°)3p 3p 4 S 1 X 314224. 0

2p" 2 P

2p

3 2p3 2 P° y2 230404. 6

4. 1 3p' 4 PX 2s 2p(3 P°)3p 3p 4 P X 317299. 9

43. 5

58. 9

2 P2 1 X 230408. 6

4 P2 1 X 317343. 4

4 p3 2/2 317402. 3

3v

2 Pi 2s2 pS)3p 3p 2 P° y2 245665. 7

2 36. 0 P2 1/2 245701. 7 4d 2 D2 2s2 0S)4d 4d 2 D 1 X 317750. 8 31.0 2 D3 2/2 317781. 8

3d 2 D2 2s2 OS) 3d 3d 2 D 1/2 267238. 5

2 5. 9 d3 2/ 267244. 4 2s2 OS) 4/ 4/ 2 F° 2/

4/ 2F* 3/2 320287. 5
39

N III—Continued N III—Continued

Edl6n Config. Desig. J Level Interval Edl6n Config. Desig. J Level Interval

3

p' 2 D2 2s 2p(3 P°)3p 3p 2 D iz 320977. 4 88.4

4p' 2 D2 2s 2p(3 P°)4p 4p 2 D 1/ 377883. 7

87. 1

2 d3 2z 321065. 8

2 D3 2J4 377970. 8

3v’

2 Si 2s 2p(3 P°)3p 3p 2 S Vi 327056. 8 4p' 4S2 2s 2p(3 P°)4p 4p 4S 1/ 378440. 5

3

d' 4F2 2s 2p(3 P°)3d 3d 4F° 1/2 830288. U 35. 1 51. 8

71. 4

4p' 4 Pi 2s 2p(3 P°)4p 4p 4 P / 379307. 3

44. 8

52. 9

4 f3 2/ 880273. 5

4 P2 1/ 379352. 1

4 F4

4F6 3/

4/

880325. 3

330896. 7

4Ps N iv OSo) Limit

2/ 379405. 0 382625.5

3d' 4 Di 2s 2p(3 P°)3d 3d 4 D° / 832796. 6

13. 4

22. 0

28. 3

4 D2 1/ 832810. 0 2s 2p( 1/ 3 P°)4d 4d 4F°

4 d3 2/ 882882. 0 4d' 4 F3 2/ 384016 49

74

4d4 3/ 832860. 8

4f4 3/ 384065

4f5 4/ 384139

5s 2 Sj 2s2 OS) 5s 5s 2 S / 333713. 1 ; 1 /

1

3d /

' 2 D2 2s 2p(3 P°)3d 3d 2 D° 1/ 38^542. 2

26. 7

4d' 2 D 2s 2p(3 P°)4d 4d 2 D° ^385126

2 d3 2/ 884568. 9

2s 2p(3 P°)4d 4d 4 D° /

3d' 4 P3 2s 2p(3 P°)3d 3d 4 P° 2/ 886218. 4 -54 6 -35. 1

4d' 4 D2 1 / 385296 27

29

4 p2 1/ 386268. 0

4 d3 2/ 385323

4 Pi / 336303. 1

4 d4 3/ 385352

3d' 2 F3 2s 2p(3 P°)3d 3d 2F° 2^ 339744 4 111. 3

4d' 4P3 2s 2p(3 P°)4d 4d 4P° 2/ 886246

2 F4 3/ 339855. 7 1 /

/

5d 2 D2 2s2

(

x S)5d 5d 2 D 1/ 341946. 2

2 1.7 d3 2/ 341947. 9 4/' 2 F3 2s 2p(3 P°)4/ 4/ 2F 2/ 386953. 4

21 2F4 3 / 386974

3d' 2 P2 2s 2p (

3 P°)3d 3d 2 P° 1/ 342693. 0 -70. 7 2Pi / 842763. 7 2s 2p( 1 /

3P°)4/ 4/ 4F

4/' 4 F3 2K 387000. 8

9. 5

32. 0

2s2 OS) 5/ 5/ 2F° 2/ 4f4 3/ 387010. 3

5/ 2F4 3/ 842752. 0

4Ffi 4/ 387042. 3

5g 2 G 2s2 OS) 5g 5g

2 G

/ 3/

l 4/2 }343116 4d' 2F3 2F4 2s 2p(3 P°)4d 4d 2F° 2/

3/

887728. 7 387811. 5

82. 8

2s2 OS) 6d 6d 2 D 1/ 4/' 4 G3 2s 2p(3 P°)4/ 4/ 4 G 2/ 388039. 2

43. 7

51. 9 63

fid 2 D3 2/ 354517 4 g4 3/ 388082. 9

4 g5 4/ 388134. 8

2s2 OS) 6/ 6/ 2 F° 2/ 4 Gg 5/ 388198

6/ 2Fi 3/ 354955. 7

4f

2 G4 2s 2p(3 P°)4/ 4/ 2 G 3/ 388190. 3

99. 7 6g 2 G 2s2 OS) 6^ Qg 2 G / 3K

l 4/ j-355214

2 g5 4/ 388290. 0

4/' 4 D4 2s 2p(3 P°)4/ 4/ 4D 3/ 388273. 4 1

1

1

to^

co

CO

Ox 4s' 4Pi 2s 2p(3 P°)4s 4s 4P° / 868525. 6

62. 7

116. 5

4 d3 2/ 388310. 9

4 P2

4 Ps 1/

2/

368588. 8

368704- 8

4 d2 4DX 1/

/

388359. 2

388386. 6 3p' 2 D2 2s 2p(4 P°)3p 3p' 2 D 1/ 373342

2 34 d3 2/ 373376 4f

2 D3 2s 2p(3 P°)4/ 4/ 2 D 2/ 388376. 9 -65. 5 2 D2 1/ 388442. 4 4p' 2 Pj 2s 2p(3 P°)4p 4p 2 P Z 374747. 4

2 57.9 P2 1/ 374805. 3 3d' 2 D2 2s 2pOP°)3d 3d' 2D° 1/ 896574. 9

9. 9

4p'

2 d3 2/ 896584. 8

2s 2p(3P°)4p 4p 4D / 376756. 6

46. 7

60. 5

89. 5

2s 2p(3 P°)5d 4 D2 1/ 376803. 3 5d 4D° Z

4 d3 2/ 376863. 8 1/

4 d4 3/ 376953. 3 2/

_ 5d' 4D4 3/ 409017

3

p' J Pi 2s 2p(iP°)3p 3p' 2P / 377591

2 17 P2 1/ 377608

June 1946.
N in Osberved Terms*

Config.

ls2 +

Observed Terms

2s2 0S)2p 2p

2 P°

2s 2pP { 2p2 2 S

2

p

2 4 P

2p2 2 P 2p

2 2 D

2p

3 | 2p* 4 S°

2p3 2 po 2p3 2 D°

ns (n> 3) np (n> 3) nd (n> 3)

2s2 0S)tw 3-5s 2 S 3, 4p

2 P° 3-6d 2 D

2s 2p(3 P°)rcx

{

3, 4s 4 P°

3s 2P°

3, 4p

4 S

3p

2 S

3, 4p

4 P

3, 4p

2 P

3, 4p

4 D

3, 4p

2 D

3, 4d 4 P°

3d 2 P°

3-5d 4 D°

3, 4d 2 D°

3, 4d 4 F°

3, 4d

2 F°

2s 2pOP°)nx' 3p' 2 P 3p' 2 D 3d' 2 D°

nf (n> 4) ng (n> 5)

2s2 0S)na 4-6/ 2 F° 5, Gg 2 G

2s 2p(3P°)nx r 4/<D

l 4/ 2 D

4/ 4 F

4/ 2 F

4/ 4 G

4/ 2 G

*For predicted terms in the spectra of the B i isoelectronic sequence, see Introduction.

N IV

(Be i sequence; 4 electrons) Z=7

Ground state Is2 2s2

2s

2 »S0 624851 cm'1 I. P. 77.450 volts

The terms are from Edl6n’s papers. The absolute values of the singlet terms are uncertain,

since only two members of the ^-series have been observed. No intersystem combinations

have been found. By analogy with N in, Edl6n (1936) estimates that 2s2 ^o—2p 3P°= 67200

cm-1

, which gives the absolute value of 2s2 as 624851 cm-1 instead of the earlier value 624499

cm-1

. The relative uncertainty x, therefore probably does not exceed ±300 cm-1

. The terms 4p

3P°, 4/ 3F°, 5g3 G, and 3d3F° are from the 1936 reference. Edldn obtains

the 4/ 3F° term by assuming that 5g

3 G is hydrogen-like (absolute value 70500 cm-1

) and adopting Freeman’s identification of the 4/ 3F°—5g 3 G group of lines. The listed value of 5g 3 G has

been adjusted to fit Edl6n’s adopted value of 4

3F°.

The estimated value of 3d

3F° is included in the table in brackets.

REFERENCES

L. J. Freeman, Proc. Roy. Soc. (London) [A] 127, 330 (1930). (T) (C L)

B. Edl6n, Nova Acta Reg. Soc. Sci. Uppsala [IV] 9, No. 6, 62 (1934). (T) (C L)

B. Edl6n, Zeit. Phys. 98, 561 (1936). (I P) (C L)
41

N IV N IV

Edl6n Config. Desig. J Level Interval Edl6n Config. Desig. J Level Interval

2s iSo 2s2 2s2 0 0 3d' 3 F 2p(2 P°)3d 3d 3 F° 2, 3,4 +x

2p

3 Po 2s(2 S)2p 2p 3 P° 0 67136. 4+x 9 4p 3 P 2s(2 S)4p 4p 3 P° 0, 1,2 503625 +x

3 Pi 1 67199. 6+x 144. 2 3 P2 2 67343. 8+x 3d' 3 Dt 2p(2 P°) 3d 3d 3 D° 1 505487 +x

3143

3 D2 2 505518 +X

2p 'Pi 2s(2 S)2p 2p »P° 1 130695 3 d3 3 505561 +X

2

p' 3 P„ 2p2 2p2 3P 0 175463. 5+x 73. 2

124. 8

3d' 1 F3 2p(2 P°)3d 3d 1 F° 3 506292

3 Pi 1 175536. 7+x

3 P2 2 175661. 5+x 4p J Pi 2s(2 S)4p 4p iP° 1 507022

2

p' *D2 2p2 2p2 iD 2 188885 2s(2 S)4d 4d 3 D 1o

2p' 1 S0 2p

2 2p2 iS 0 235370 4d 3 D3 3 511384 +x

3s 3 Si 2s(2 S)3s 3s 3 S 1 377206+x 3d' 3 P2 2p(2 P°)3d 3d »P° 2 511440 +x

3 -53

Pi 1 511493 +x

3s X S0 2s(2S)3s 3s iS 0 388858 0

3p »Pi 2s(2 S)3p 3p iP0 1 404521 4d iD2 2s(2S)4d 4d iD 2 514638

3p 3 P0 2s(2S)3p 3p 3 P° 0 405893. 2+x 15. 8 35.4

4/ 3 F2 2s(2 S)4/ 4/ 3 F° 2 516631 +X 8

11

3 Pi 1 405909. O+x 3 f3 3 516639 +X

3 P2 2 405944 4+x 3 f4 4 516650 +X

3d

3 DX 2s(2 S)3d 3d 3 D 1 419967. 8+x 3. 5

8. 1

3d' iP! 2p(2 P°)3d 3d ip° 1 519414

3 D2 2 419971. 3+x

3 d3 3 419979. 4+x 4/ x F3 2s(2 S)4/ 4/ 1F° 3 521868

3d !D2 2s(2S)3d 3d iD 2 429158 5p *P2s(2 S)5p 5p ip° 1 550218

3s' 3 P0 2p(2 P°) 3s 3s 3 P° 0 465223. 0+x 77. 6

162. 8

2s (

2 S) 5d 5d 3 D 1

3 Pi 1 465300. 6+x 2

3 P2 2 465463. 4+x 5d 3 D3 3 552731 +x

3s' iP, 2p(2 P°)3s 3s »P° 1 473032 5g

3 G 2s (

2S) 5g 5g

3 G 3, 4,5 554419 +X

3p' 'Pi 2p(2 P°)3p 3p iP 1 480880 2s (

2 S) 6d 6d 3 D 19

2p(2 P°)3p 3p 3 D 1 6d 3 D3 3 574940 +X

3p' 3 D2 2 484394 +x 131 *d3 3 484525 +x 4p' x D2 2p(2 P°)4p 4p X D 2 591043

3p' 3 Si 2p(2P°)3p 3p 3 S 1 487542 +x 4d' 3 Dj 2 2p(2 P°)4d 4d 3 D° 1,2 593665 +X

39

0

3D3 3 593704 +X

2p(2 P°)3p 3p 3 P

3p' 3Pi

3 P2

1 494240 +x

494338 +x 98 Nv(2 Sh) Limit 6248512

3d' iD2 2p(2 P°)5d 5d 3 D° 1 2p(2P°)3d 3d iD° 2 498315 2

5d' 3 D3 3 634198 +x

3p' 1 D2 2p(2P°)3p 3p »D 2 499708

May 1946.
42

N iv Observed Terms*

Config.

ls2 +

Observed Terms

2s2

2s(2S)2p

2p2

2s2 iS

/ 2p

3 P°

\ 2p

X P°

/ 2p2 3 P

\2p2 iS 2p

2 ID

ns (ft >3) ftp (ft >3) nd (ft >3) ft/ (ft >4) ng (ft >5)

/ 3s 3 S 3, 4p

3 P° 3-6d

3 D 4/ 3 F° 5g

3 G

2s(2S)nx

1 3s X S 3-5p JP0

3, 4d iD 4/ X F°

r 3s 3 p° 3p 3 S 3p

3 P 3p 3 D 3d 3 P° 3-5d

3 D°

2p(2P°)nx

\ 3s ip° 3p

! P 3, 4p X D 3d iP° 3d >D° 3d X F°

*For predicted terms in the spectra of the Be i isoelectronic sequence, see Introduction.

N V

(Li i sequence; 3 electrons) Z=7

Ground state Is2 2s 2S^

2s 2Sh 789532.9 cm"1 I. P. 97.863 volts

Both Edl6n and Cady have published analyses of this spectrum. Edl6n has recently ex- tended the earlier work and has generously furnished his revised term list in manuscript form.

The observed term values in the table are from this unpublished list. Edldn’s extrapolated intervals and the term values for higher series members based on his

calculations from the series formula are entered in brackets in the table. These have been

taken from his 1933 and 1934 papers.

REFERENCES

W. Cady, Phys. Rev. 44, 821 (1933). (T) (C L)

B. Edl6n, Zeit. Astroph. 7, 378 (1933). (T) (C L)

B. Edl6n, Nova Acta Reg. Soc. Sci. Uppsala [IV] 9, No. 6, 41 (1934). (T) (C L)

B. Edl6n, unpublished material (Sept. 1947). (I P) (T)
43

N v Nv

Edl6n Config. Desig. Level Interval Edl6n Config. Desig. J Level Interval

2s 2 Si 2s 2s 2 S Vi 0. 0

f 3/ 1 6GH 6^, 6h 6^ 2 G, etc. < to } [713335] 2V

2Pi 2P 2p

2 P° Vi. 80464- 9 258.4 l 5/ J

2 P2 1 X 80728. 3 7S 7s 7s 2 S z [731432]

3s 2Si 3s 3s 2 S y2 456134

/ X

3v \ 1/2 2 Pi 3P 3p

2 P° H 477777. 2 74 2 7P 7p 7p

2 P°

}

782998

3 P2 1/2 477851. 4

/ 1/2 3d 1 2/2 2D2 3d 3d 2 D 1/2 484403

[24] 7D 7d 7d

2 D

} [733516]

2 d3 2/ 484427

/ 2/2 4s l 3 /

2Sj 4s 4s 2 S y2 606337 7F 7/ 7f

2-po }

[ 783547

]

4p 2 P2 4p 4p

2 P° { x

1 1/2 }

615150 [32] 7GHI 7g, etc. 7g 2 G, etc.

f 3V2

{ to [733552]

/ 1/2

1 2y2

l 6/2 J 4d 2 D3 4d 4d 2 D

}

617905 [10] 8S 8s 8s

2 S X [745260]

5s 5s 2 S X 673882

8P 8P 8p

2 P° ( H

l 1/2 }

[746311 ] 5p 2 P2 5p 5p

2 P° f X

1 1/2 }

678297 [16] 8D 8d 8d 2 D {

1/2

l 2/ } [746649] 5d 2 DS 5d 5d 2 D 1 1 /

1 2/2 }

679725 [5] 8F 8/ 8/

2F° ; 2 /

t 3y2 } [746670]

6S 6s i 6s

2 S X [709947]

f 3/

< to

l 7/2 6p

2P

6d

2 D

6p

6d

6p

2 P°

6d 2 D

{ X

1 1/2

/ 1/2

l 2/

} 712464

}

713289

8GHIK 8g, etc. 8^

2 G, etc.

[ [746674]

N vi OSo) Limit 789532. 9

6F 6f 6/

2 F° r sx

1

/ } [718327]

September 1947. N vi

(He i sequence; 2 electrons) Z=7

Ground state Is2 !So

Is2 4452800 ± 500cm-1

. I. P. 551.925±0.062 volts

Tyr&i has observed the first three members of the singlet series. They are in the region

from 23 A to 28 A. He lists also one intersystem combination—a line at 29.084 A classified as

Is2 ^o—2p 3Pi. His unit, 103 cm-1

, has here been changed to cm-1

. Edl6n has generously furnished his unpublished manuscript containing absolute values of

the triplet terms extrapolated along the He i isoelectronic sequence. The relative positions

of the singlet and triplet terms thus determined confirm the intersystem combination reported

by Tyr4n. The 2s 3S—2p 3P° combination has apparently not been observed, but Edl4n

regards the extrapolation from the irregular doublet law as very reliable. Brackets are used

in the table to indicate extrapolated values not yet confirmed by observation.

REFERENCES

F. Tyr6n, Nova Acta Reg. Soc. Sci Uppsala [IV] 12, No. 1, 24 (1940). (I P) (T) (C L)

B. Edl6n, unpublished material (Sept. 1947). (T)
44

N vi N VI

Config. Desig. J Level Interval Config. Desig. J Level Interval

Is* Is2 ig 0 0 Is 3p 3v 1 4016390

Is 2s 2s 3 S 1 [3385890] Is 4p 4v ‘P0 1 4206810

Is 2p 2p

3 P° 0 [3438270]

3438280

[3438570]

3473790

[10] [290]

12 N vii (

2Si) Limit 4452800

Is 2p 2p

ip° 1

September 1947. N vn

(H sequence; 1 electron) Z=7

Ground state Is 2S^

Is 2 S^ 5379860 cm"1 I. P. 666.83 volts

The first Lyman line has been observed by Tyren. J. E. Mack has calculated the terms

in the table, “using RN

l *= 109733.004 and A=0.040. The series limit of N15 is higher by 14.0

cm-1 than the value given here.”

REFERENCES

F. Tyr6n, Nova Acta Reg. Soc. Sci. Uppsala [IV] 12, No. 1, 24 (1940). (C L)

J. E. Mack, unpublished material (1949). (I P) (T) (C L)

N vii

Config. Desig. J Level Interval

Is Is 2 S 0

2P 2p

2 P° K2 4034535

11

70

JJ 876.9 2s 2s 2 S 4034605

2V 2p

2 P° i H 4035412

3s, etc. 3s 2 S, etc. etc. 4782035

to 381

4s, etc. 4s 2 S, etc. y2 , etc. 5043625

to 789

oo —Limit 5379860

February 1949.
45

OXYGEN

Oi

8 electrons Z=8

Ground state Is2 2s2 2

p

4 3P2

2p* 3P2 109836.7 cm"1 I. P. 13.614 volts

Edl6n has published a detailed analysis of this spectrum in which he has revised and

extended the earlier work by others. The terms have all been taken from his paper. For the

higher series members not included in his main term table, ns 5S° and ns 3S° (n=8 to 11), and

nd 6D° and nd*D° (n =8 to 10) the observed values taken from his discussion of the series

formulas (p. 15), in which he compares observed and calculated values, are listed below.

Two terms not derived from observed lines are entered in brackets: 11s 6S°, which is calculated from the series formula and 2s 2p5 !P°, which is extrapolated.

Intersystem combinations connect the terms of the singlet, triplet, and quintet systems.

Kiess and Shortley have observed g values for four levels as follows

Desig. Obs. g 3s 5 S°2 1.999 3p

5 Pi 2.506

fi P2 1.836

6 p3 1.666 REFERENCES

A. Fowler, Report on Series in Line Spectra p. 166 (Fleetway Press, London, 1922). (T) (C L) R. Frerichs, Phys. Rev. 34, 1239 (1929); 36, 398 (1930). (T) (C L) H. E. White, Introduction to Atomic Spectra p. 266 (McGraw-Hill Book Co., Inc., New York, N. Y.,1934). (G D)

K. R. More and C. A. Rieke, Phys. Rev. 50, 1054 (1936). (Standard wavelengths)

B. Edl6n, Kungl. Svenska Vetenskapsakad. Handl. [3] 20, No. 10, 31 pp. (1943). (I P) (T) (C L)

W. F. Meggers, J. Opt. Soc. Am. 36, 431 (1946). (Summary hfs) C. C. Kiess and G. Shortley, J. Research Nat. Bur. Std. 42, 190, RP1961 (1949). (Z E)

Oi Oi

Config. Desig. J Level Interval Config. Desig. J Level Interval

2s2 2p* 2p4 3P 2

10

0. 0

158. 5

226. 5 -158. 5 -68. 0

2s2 2p3

(

4 S°)4s

2s2 2p3 (

4 S°) 3d

4s 3 S°

3d S D°

14

96225. 5

97420. 24 -0. 13 -0. 13 3,2 97420. 87

2s2 2p* 2p4 iD 2 15867. 7 2, 1,0 97420. 50

2s2 2p* 2p* 4 S 0 33792. 4 2s2 2p3

(

4 S°)3d 3d 3 D° 3, 2,1 97488. 14

2s2 2p3

(

4 S°) 3s 3s 5 S° 2 78767. 81 2s2 2p3 (

4 S°)4p 4p 5 P 1 99092. 64

0. 67

1. 21 2 99093. 31

2s2 2p3

(

4 S°)3s 3s 3 S° 1 76794. 69 3 99094. 52

2s2 2p3 (

4 S°)3p 3pS P 1 86625. 35

2. 02

3. 67

2s2 2p3 (

4 S°)4p 4p

3 P 2, 1,0 99680. 4

2 86627. 37

3 86631. 04 2s2 2p3

(

2 D°)3s 3s' 3 D° 3 101135. 04 12 17

2s2 2p3

(4 S°)3p

2 101147. 21 -7. 89 3p 3 P 2 88630. 84

0. 54

-0. 70

1 101155. 10

1 88630. 30

0 88631. 00 2s2 2p3 (

4 S°)5s 5s 6 S° 2 102116. 21

2s2 2p3 (

4 S°)4s 4s 5 S° 2 95476. 43 2s2 2p3

(

4 S°)5s 5s 3 S° 1 102411. 65
46

O I—Continued O I—Continued

Config. Desig. J Level Interval Config. Desig. J Level Interval

2s2 2p3 (

2 D°)3s 3s' iD° 2 102661. 63 2s2 2p3 (

2 D°)3p 3p' iD 2 116630. 51

2s2 2p3 (

4 S°)4d 4d 6 D° 4

o 102865. 09 2s2 2p3 (

2 D°)4s 4s' 1 D° 2 122798. 7

2 2s2 2p3

(

2 D°)3d 3d' 3 P° 2 123296. 6 -58. 6 -31. 7

1 1 123355. 2

0 0 123386. 9

2s2 2p3

(

4 S°)4d 4d 3 D° 3, 2,1 102908. 14 2s2 2p3

(

2 D°)3d 3d' 3F° 4

Q 124213. 18

2s2 2p3 (

4 S°)5p 5p 3 P 2, 1,0 103869. 4

O2

2s2 2p3 (

4 S°)6s 6s 6 S° 2 105019. 0 2s2 2p3 (

2 D°)3d 3d' 1 G° 4 124238. 21

2s2 2p3

(

4 S°)6s 6s 3 S° 1 105164. 90 2s2 2p3

(

2 D°)3d 3d' 3 G° 5 124239. 66 -18. 71

5. 85

4 124258. 37

2s2 2p3

(

4 S°)5d 5d

6 D° 4 to 0 105385. 3 3 124252. 52

2s2 2p3

(

4 S°)5d 5d

3 D° 3, 2,1 105408. 58 2s2 2p3

(2 D°)3d 3d' 4 F° 3 124326. 32

2s2 2p3 (

4 S°)6p 6p

3 P 2, 1,0 105911. 3 2s2 2p3 (

2D°)4p 4

p' 3 D 3 125774. 51 -7. 58 2 125782. 09

2s2 2p3

(

4 S°)7s 7s 5 S° 2 106545. 1 1 125787. 14 — 5. 05

2s2 2p3

(

4 S°)7s 7s 3 S° 1 106627. 9 2s 2p5 2p6 3 P° 2 126266. 48 -73. 44 1 126339. 92

2s2 2p3

(

4 S°)6d 6d 5 D° 4 to 0 106751. 2 0 126383. 44

43. 52

2s2 2p3 (

4 S°)6d 6d 3 D° 3, 2,1 106765. 8 2s2 2p3

(

2 P°)3p 3p" 3 D 3 127281. 85 -5. 77 2 127287. 62

2s2 2p3

(

4 S°)8s 8s 5 S° 2 107445. 4 1 127290. 93 — 3. 31

2s2 2p3

(

4 S°)8s 8s 3 S° 1 107497. 1 2s2 2p3 (

2P°)3p 3p" iP 1 127667. 85

2s2 2p3 (

4 S°)7d 7d

6 D° 4 to 0 107573. 1 2s2 2p3

(

2 P°)3p 3p" 4 D 2 128595. 02

2s2 2p3

(

4 S°)7d 7d 3 D° 3, 2,1 107582. 7 2s2 2p3 (

2 D°)5s 5s' 1 D° 2 129134 ±

2s2 2p3

(

4 S°)9s 9s 6 S° 2 108021. 4

* 2s2 2p3 (

2 D°)4d 4d' 3 F° 4

Q 129666. 55

2s2 2p3

(

4 S°)9s 9s 3 S° 1 108057. 6 U

2

2s2 2p3

(

4 S°)8d 8d

5 D° 4 to 0 108105. 7 2s2 2p3 (

2 D°)4d 4d' 4 G° 4 129679. 49

2s2 2p3

(

4 S°)8d .8d3 D° 3, 2,1 108116. 6 2s2 2p3 (

2 D°)4d 4d' 3 G° 5 129680. 14 -19. 02

2s2 2p3

(4 S°)10s 10s 5 S°

4 129699. 16

2 108412. 0 3 129693. 08 6. 08

2s2 2p3 (

4 S°)10s 10s 3 S° 1 108436. 1 2s2 2p3

(

2 D°)4d 4d' iF° 3 129736. 60

2s2 2p3

(4 S°)9d 9d

5 D° 4 to 0 108470. 2

2s2 2p3 (

2 D°)4d 4d' 3 P° 2 129969. 60 -9. 44

-5. 11

2s2 2p3

(

4 S°)9d 9d 3 D° 3, 2,1 108477. 8 10

129979. 04

129984- 15

2s2 2p3

(

4 S°)lls 11s 6 S° 2 [108688. 4] 2s2 2p3

(

4 S°)lls 11s 3 S° 1 108707. 3

2s2 2p3 (

2 P°)3p 3p" 0 130943. 21

2s2 2p3

(

4 S°)10d lOd 5 D° 4 to 0 108731. 5

2s2 2p3 (

2D°)6s 6s' iD° 2 131927 ±

2s2 2p3 (

4 S°)10d lOd 3 D° 3, 2,1 108734. 4 2s2 2p3 (

2 D°)5d 5

d' 3 F° 4 132190.7 ±

0 ii (

4 Sih) 2s2 2p3 (

2 D°)3p

Limit 109836. 7

o

o

3

p' 3 D 3

2

113294. 42

113294. 55 -0. 13 -3. 46

2s2 2p3 (

2 D°)5<Z 5d' 4 G° 4 132197.6 ±

1 113298. 01 2s2 2p3 (

2 D°)5d 5d' 3 G° 5 132198. 1 -19. 7

2s2 2p3 (

2 D°)3p 3

p' 3 F

4 132217. 8

4 113714. 06 -7. 00

-5. 75

3

3 113721. 06

2 113726. 81 2s2 2p3 (

2 D°)5d 5d' 3 P° 2,1

0

132310 ±

2s2 2p3

(

2 P°)3s 3s" 3 P° 2

10

113910. 20

113920. 63

113926. 80

-10. 43

-6. 17

2s2 2p3 (

2 D°)7s

2s2 2p3 (

2 D°)6d

7

s' iD°

6d' 3 P°

2 133413 ±

2,1 133618 ±

2s2 2p3

(

2 D°)3p 3

p' 4 F 3 113995. 81 0

2s2 2p3 (

2 P°)3s 3s" iP° 1 115918. 30 2s 2

p

5 2p6 ip° 1 [189837]

August 1947.
47

O I Observed Terms*

Config.

1 S

2 +

Observed Terms

2s2 2p* { 2p* iS 2p* 3 P

2p

i !D

2s 2

p

6 2p

5 3 P°

ns ( n> 3) np (n> 3) nd (n> 3)

2s2 2p*(i S°)nx /3-10s 6 S°

\3-lls 3 S°

3, 4p

6 P

3-6p

3 P

3-1 Od 5 D°

3-10d 3 D°

2s2 2p3

(

2 D°)nx'

{

3s' 3 D°

3-7s' ^D°

3, 4p' 3 D

3p' !D

3p' 3 F

3p' !F 3-6d' 3 P° 3-5d' 3 F° 3-5d' 3 G°

3, 4d' iF° 3-5d' iG°

2s2 2p3

(2P°)nx"

{

3s" 3 P°

3s" 1 P° 3p" iS 3p" iP

3p" 3 D

3p" iD

*For predicted terms in the spectra of the O i isoelectronic sequence, see Introduction.

On

(N i sequence; 7 electrons) Z=8

Ground state Is2 2s2 2^3 4Si§

2f

4Si°i 283550.9 cm"1 I. P. 35.146 volts

The terms are from Edl6n’s publications. He has summarized the earlier work on analysis

by others and extended it by his observations in the far ultraviolet.

Edl6n states that a number of the 5/-terms are very uncertain. These are followed by

a “?” in the table. His estimated values of three terms from the (

1S) limit in O hi are given

in brackets.

Mihul lists the observed Zeeman effects for 111 lines, which in general agree well with the

theoretical patterns for the adopted classifications. From his data a number of ^-values could

be calculated, but many of the observed patterns are unresolved.

Although the analysis of O n is fairly complete, the measures by different observers are discordant. The term values could be greatly improved by a set of homogeneous observations.

A monograph containing all classified lines of this spectrum is also needed.

The doublet and quartet terms are connected by intersystem combinations, but the

sextet terms are not so connected with the rest. The relative uncertainty, x, may be a few

hundred cm-1

. REFERENCES

I. S. Bowen, Phys. Rev. 29, 231 (1927). (T) (C L)

A. Fowler, Proc. Roy. Soc. (London) [A] 110, 476 (1926). (T) (C L)

C. Mihul, Ann. de Phys. [10] 9, 294 (1928). (T) (C L) (Z E) H. N. Russell, Phys. Rev. 31,. 27 (1928). (T) (C L)

B. Edl6n, Nova Acta Reg. Soc. Sci. Uppsala [IV] 9, No. 6, 136 (1934). (I P) (T) (C L) (G D)

B. Edl6n, Zeit. Phys. 93, 728 (1935). (T) (C L)
48

On On

Edl6n Config. Desig. J Level Interval Edl6n Config. Desig. J Level Interval 2p 4S2 2s2 2p3 2p* 4 S° 1/2 0. 0 3d 2 P2 2s2 2p2 (3 P)3d 3d 2 P iz 233430. 10 2 -11399 Pi z 233544. 09 2p 2 D3 2s2 2p3 2p3 2 D° 2/ 26808. 4 2 -21. 0 D2 1/ 26829. 4 3d 2 D2 2s2 2p2 (3 P) 3d 3d 2 D iz 234402. 48 2 d 51. 97 3 2Z 234454. 45 2v 2 P2 2s2 2p3 2p3 2 P° 1/ 40466. 9 2 -1. 5 Pi z 40468. 4 4s 4 P4 2s2 2p2 (3 P)4s 4s 4P z 238626. 32 4 105. 22 p2 IZ 238731. 54

2p' 4P3 2s 2p4 2p4 4 P 2/ 119837. 7 -163. 4 -82. 4 4p3 2Z 238892. 96 161. 42 4p2 1/ 120001. 1 4Pi Z 120083. 5 4s 2 Pi 2s2 2p2 (3 P)4s 4s 2 P z 240328. 75 2 187. 53 P2 iz 240516. 28 2

p' 2 D3 2s 2p4 2p4 2D 2/ 165987. 7 2 -8. 3 d2 1/ 165996. 0 3s' «S3 2s 2p3 (6 S°)3s 3s'" ®S° 2Z 245395.5 +x

3s 4Pi 4P2 2s2 2p2 (3 P)3s 3s 4P z

iz

185235. 36

185340. 68

105. 32

158. 52 4p 4 Di 4 D2 2s2 2p2 (3 P)4p 4p 4 D° z

iz

245767. 80

245816. 29 48. 49

86. 56

126. 10 4P3 2Z 185499. 20 4 d3 2Z 245902. 85

2s2 2p2 (3 P)3s 3s 2 P 4d4 3Z 246028. 95

3s 2 Pi z 188888. 38 2 179. 99 P2 iz 189068. 37 4p 2 D2 2s2 2p2 (3P)4p 4p 2 D° iz 248009. 1 176. 2 2p4 2 S z 2 d3 2Z 248185. 3

2p' 2 S, 2s 2p4 195710. 4

2s2 2p2 (3 P)3p 3p 2 S° 4p 2Pi 2s2 2p2 (3 P)4p 4p 2 P° z 248435. 35

88. 88 3p 2 Si z 203942. 21 2 P2 iz 248514. 23 3p 4 Di 4 D2 2s2 2p2 (3 P)3p 3p 4 D° z

iz

206730. 80

206786. 34

55. 54

91. 56

124. 62

2s2 2p2 (x S)3p 3p" 2P° / z l IZ J[250251] 4 d3 2Z 206877. 90 4 d4 3Z 207002. 52 3d 2 F4 2s2 2p2 ( x D) 3d 3d' 2 F 3Z 251220. 9 2 -3. 2 f3 2Z 251224. 1 3s 2 D3 2s2 2p2 (x D) 3s 3s' 2 2 D 2z 206971. 3 - 1. 0 d2 IZ 206972. 3 3d 2 Gs 2s2 2p2 (x D)3d 3d' 2 G 4Z 252607. 7 2 -1. 2 G4 3Z 252608. 9 3p 4 Pi 2s2 2p2 (3 P)3p 3p 4 P° z 208346. 17 46. 10

91. 97 2s2 2p2 ( 4 P2 iz 208392. 27 3d 2 D2 x D)3d 3d' 2 D iz 253046. 23 4 2. 12 P3 2Z 208484• %4 2d3 2Z 253048. 35 3p 2 D2 2s2 2p2 (3P)3p 3p 2 D° iz 211521. 98 190. 68 3d 2 Pi 2s2 2p2 ( x D)3d 3d' 2 P z 253789. 51 2 2. 36 D3 2Z 211712. 66 2P2 iz 253791. 87 3v 4S2 2s2 2p2 (3P)3p 3p 4 S° iz 212161. 94 2s2 2p2 (3P)4d 4d 4F iz

2Z 2 3Z p' 2P2 2s 2p4 2p4 2 P iz 212593. 2 -169.2 4d 4F4 254481. 5 2 109. 2

Pi z 212762. 4 4f6 4Z 254590. 7 3p 2 P4 2s2 2p2 (3 P)3p 3p 2 P° z 214169. 74 59. 74 2s2 2p2 (3 P)4d 4d 4 D z 2P2 iz 214229. 48 4d 4D2)3 / iz 1 2Z 1254895. 2

2s2 2p2 ( x S)3s 3s" 2 S z [2268511 3Z 3p 2F3 2s2 2p2 (x D)3p 3p' 2 F° 2Z 228723. 3

23. 6

3s' 4S2 2s 2p3 («S°)3s 3s'" 4S° iz 254982. 2 2 F4 3Z 228746. 9 4d 4 P3 2s2 2p2 (3 P)4d 4d 4 P 2Z 255104. 6 -36.3

-21.7 3p 2 D3 2s2 2p2 (x D)3p 3p' 2 D° 2Z 229946. 6 -21. 6 4p2 iz 255140. 9 2 D2 IZ 229968. 2 4p2 z 255162. 6 3d 4F2 2s2 2p2 (3 P)3d 3d 4 F iZ 231296. 05 54. 03

77. 91

102. 27

4d 2P2 2s2 2p2 (3P)4d 4d 2P iz 255172. 5 -108. 9 4 f3 2Z 231350. 08 2Pi z 255281. 4 4f4 3Z 231427. 99 4 f6 4Z 231530. 26 4d 2F3 2s2 2p2 (3P)4d 4d 2F 2Z 255301. 3 163.9 2F4 3Z 255465. 2 3d 4P3 2s2 2p2 (3P)3d 3d 4 P 2Z 232462. 83 -73. 23

-66. 51 4 P2 iz 232536. 06 3d 2Si 2s2 2p2 (x D)3d 3d' 2 S z 255622. 4 4Pi z 232602. 57 z

4/ 2 D3 2s2 2p2 (3 P)4/ 4/ 2 D° 2Z 255689. 6 -122. 6 3p 2 Pi 2P2 2s2 2p2 (x D)3p 3

p' 2 P° 232480. 1 232526. 7

46. 6 2d2 iz 255812. 2 iz

4/ 4D4 2s2 2p2 (3P)4/ 4/ 4 D° 3Z 255691. 4 121 7 3d 4 Di 2s2 2p2 (3 P)3d 3d 4 D z 232711. 70

34. 28

1. 53

6. 35 4 D3 2Z 255813. 1 -100i 4 D2 iz 232745. 98 4d2 iz 255913 ±

'Da 2Z 232747. 51 z 255912. 0 4 D4 3Z 232753. 86

3d 2Fa 2s2 2p2 (3 P)3d 3d 2 F 2Z 232796. 27

162. 99 2 F4 3Z 232959. 26
49

O II—Continued O II—Continued

EldSn Config. Desig. J Level Interval Elcten Config. Desig. / Level Interval

4/ 4 Gc 2s2 2p2(3P)4/ 4/ 4 G° 234 255755. 8

3. 6

68. 2

149. 9

5/ 2 G4 2s2 2p2

(

3 P)5/ 5/ 2 G° 334 265763. 0

4 167. 2 g4 3V2 255759. 42 g5 434 265930. 2

4 g6 434 255827. 6

4 g9 534 255977. 5

5d

2 D3 2s2 2p2

(

3 P)5d 5d

2 D 134 234 265856

4/ 2 G4 2s2 2p2

(

3 P)4/ 4/ 2 G° 3>2 255829. 4 154. 2 2 Ge 434 255988. 6 5/ 4 F2 2s2 2p2 (

3P)5/ 5/ 4F° 134 2659287 33

24

14

4 f3 234 2659617

4d

2 D2 2s2 2p2

(

3 P)4d 4d 2 D 134 255843. 1 54. 1

4 f4 334 265985

2 D3 234 255897. 2

4 FS 434 265999

4/ 4F2 2s2 2p2 (

3 P)4/ 4/ 4F° 134 256083. 5

4 1 5/ 2 F3 2s2 2p2 (

3 P)5/ 5/ 2F° 234 2659887

11 4f3 234 256087. 6

35. 5

13. 1

2 f4 334 2659997

4 F4 354 256123. 1

4f6 434 256136. 2 3p' «P2 2s 2p3 (

5 S°)3p 3p"' «P 134 267763. 39+x

7. 46

12. 55

e P3 234 267770. 85 +x

4/ 2 F3 2s2 2p2

(

3P)4/ 4/ 2F° 234 256125. 8

17. 5

6 p4 334 267783. 40 +x

2 f4 334 256143. 3

4d

2 F3 2s2 2p2 (

4 D)4d 4d' 2F 234 274739. 2

43. 2

5s 4 Pi 2s2 2p2 (

3 P)5s 5s 4 P 34 257693. 7

104. 2

2 f4 334 274782. 4

4 P2 134 257797. 9

165. 9 4Pa 2>4 257963. 8

4d

2 D23 2s2 2p2 (

1 D)4d 4d' 2 D / 134 l 234 } 274920

5« 2 Pi 2s2 2p2

(

3 P)5s 5s 2P 34 258408. 6

193. 1

2P2 134 258601. 7 4d 2 Pi 2 2s

2 2p2

(

1 D)4d 4d' 2 P / 34 1 1 34 }275611?

4s 2 D3 2s2 2p2 (*D)4s 4s' 2 D 234 259286. 2 -0. 8 2d2 134 259287. 0 4/ 2 G 2s2 2p2

(

1 D)4/ 4f

2 G° / 334

1 434 } 275841. 3

2s2 2p2

(

3 P) 5p 5p

4D° 34 5p 4 D2

4 d3 134 234 260959

261042

83

138

4/ 2 F 2s2 2p2 (

1 D)4/ 4f

2po / 234

1 334 } 275879. 6

4 d4 334 261180

/ 1/2 2s 1 234 2 2p2

(

3 P) 5p 5p 4P° 34 2s2 2p2

(

1 S)3d 3d" 2 D [275951]

5p 4 P2 134 261261. 7

92. 6

34 4 Ps 234 261354- 3 4d

2 S: 2s2 2p2 (4 D)4d 4d' 2S 275997?

5p

2 D2 2d3 2s2 2p2 (

3 P) 5p 5p2 D° 134 234 261697. 5

261869. 4

171. 9 4f 2 D 2s2 2p2

(

1 D)4/ 4

/' 2 D° / 134

1 234 };276066. 3

2s2 2p2 (

3 P)5d 5d4D 34 f 134

l 234 V 4/ 2H 2s2 2p2 (

1 D)4/ 4/' 2H° J 434

1 5y2 } 276109. 1 5d

4D2,3 >265220. 3

J

334 4/ 2 P 2s2 2p2 (

1 D)4/ 2 p° f 34 1 134 1 276263. 97 5d 4P3 2s2 2p2

(

3 P)5d 5d4P 234 265431. 5 -36. 7

4Pi 2

5d

2F

/ 134

l 34

234

334

j-265468. 2 5s 2 D23 2s2 2p2 0D)5s

O m (

3 P0)

5s' 2 D

Limit

/ 134

1 234 }278140

2s2 2p2

(

3 P)5d 283550.9

5d

2F4 265578?

3d' 8 DS 2s 2p3 (

5 S°)3d 3d'" e D° 434 291895. 90 +x -0. 88 -1. 23

-1. 10 -0. 70

5/ 4D4 2s2 2p2 (

3 P)5/ 5/ 4 D° 334 265639 -66

-57

-97

«d4 334 291896. 78+x

4 D3 234 265705? «d3 234 291898. 01 +x

4 d2 134 2657627 6 d2 134 291899. 11+x

4 D! 34 2658597 6 D! 34 291899. 81 +x

5/ 4 G3 2s2 2p2 (

3 P)5/ 5/ 4 G° 234 2656657 26

70

164

4s' 6 S3 2s 2p3 (

5 S°)4s 4s'" «S° 234 298849.2 +x

4 g4 334 265691

4 g5 434 265761

4 g6 534 265925

December 1947.
0 ii Observed Terms*

Config.

1 s

2 +

Observed Terms

2s2 2

p

3 / 2p3

S°

X 2

p

3 2 P° 2p3 2 D°

2s 2p* / 2

p

4 4 P

l 2p4 2 S 2p4 2 P 2

p

4 2 D

ns (n> 3) np (n> 3)

2s2 2p2

(

3 P)nx / 3-5s 4 P

l 3-5s 2 P

3p

4 S°

3p

2 S°

3, 5p 4 P°

3, 4p

2 P°

3-5p 4 D°

3-5p 2 D°

2s2 2p2

(

1 T))nx' 3-5s' 2 D 3p' 2 P° 3p' 2 D° 3

p' 2 F°

2s 2p\*S°)nx’" J3, 4s'" °S° t 3s'" 4 S°

3p'" «P

nd (n> 3) nf (n> 4)

2s2 2p2

(

3 P)nx / 3-5d 4 P 3-5d 4 D

\ 3, 4d 2 P 3-5d 2 D

3, U 4 F

3-5d 2 F

4, 5/ 4 D°

4/ 2 D° O

O 66oo

2s2 2p2

(

1 D)wz' 3, 4d' 2S 3, 4d' 2 P 3, 4d' 2 D 3, 4d’ 2F 3d' 2 G 4f 2 P° 4/' 2 D° 4/' 2F° 4/' 2 G° 4/' 2H°

2s 2p3 (

e S

0)rw;'" |

3d'" fl D°

For predicted terms in the spectra of the N i isoelectronic sequence, see Introduction.

Ora

(C i sequence; 6 electrons) Z=8

Ground state Is2 2s2 2_p

2 8P0

2p

2 3P0 443193.5 cm-1

I. P. 54.934 volts

The terms are from the papers by Edlen. The singlet, triplet and quintet terms are con- nected by intersystem combinations. Edlen has kindly furnished some unpublished results

for inclusion here, namely, that intersystem combinations with quintet terms indicate that his

published absolute values of these terms should be decreased by 418 cm-1

. This correction

has been incorporated into the tabular values of the quintet terms.

REFERENCES

C. Mihul, Ann. de Phys. [10] 9, 326 (1928). (T) (C L) (Z E)

A. Fowler, Proc. Roy. Soc. (London) [A] 117, 317 (1928). (T) (C L) B. Edl6n, Nova Acta Reg. Soc. Sci Uppsala [IV] 9, No. 6, 115 (1934). (I P) (T) (C L) (G D)

B. Edl6n, Zeit. Phys. 93, 726 (1935). (T) (C L)

B. EdlSn, Naturwiss. 30, 279 (1942). (T) (C L) B. Edl6n, unpublished material (Dec. 1947). (T)
51

Ora Ora

Edl6n Config. Desig. J Level Interval Edl6n Config. Desig. J Level Interval

2p

3 P0 2s2 2p2 2p23P 0 0. 0 113 4

3s' 3 P0 2s 2p2 (

4P)3s 3s 3P 0 350026. 1 96. 8 179.4 *Pi 1 113. 4

193. 4

3 Pi 1 350122. 9

3 P2 2 306. 8

3P2 2 350302. 3

2p

X D2 2s2 2p2 2p2 X D 2 20271. 0 4s 3 P0 2s2 2p(2 P°)4s 4s 3 P° 0 356732 106

273

3 Px 1 356838

2p iSo 2s2 2p2 2p2 X S 0 43183. 5

3 P2 2 357111

2

p' 6 S2 2s 2p3 2p3

S° 2 60312.

4s iPi 2s2 2p(2P°)4s 4s 4P° 1 358667. 4

2p' 3 D3 2s 2p3 2p3 3 D° 3 120025. 4 97 9

3p' 3 Si 2s 2p2

(

4 P)3p 3p3 S° 1 363266. 8

*d2 2 120052. 6 -5. 9

1 120058. 5 3p' 6 D0 2s 2p2 (

4P)3p 3p 6D° 0 365515. 76

34. 84

68. 52

100. 04

127. 30

6Di 1 365550. 60

2p' 3P2 2s 2p3 2p3 3 P° 2 142381. 7 -1. 1 -14. 1

6 d2 2 365619. 12

3 Pi

3Po

10

142382. 8

142396. 9

6d3

6d4 34

365719. 16

365846. 46

2

p' X D2 2s 2p3 2p3 1 D° 2 187049. 4 4p 4Pi 2s2 2p(2 P°)4p 4p 4 P 1 365723. 9

2p' 3Si 2s 2

p

3 2p3 *S° 1 197086. 7 4p 3 Di 2s2 2p(2 P°)4p 4p 3 D 1 366486. 91

107. 10

207. 03

3 D2 2 366594. 01

2p' !Pi 2s 2p3 2p3 iP° 1 210458. 5

: d3 3 366801. 04

3s 3 P0 2s2 2p(2P°)3s 3s 3P° 0 267257. 29

118. 36

256. 94

4p 3 Si 2s2 2p(2 P°)4p 4p 3S 1 367952. 20

3 Pi 1 267375. 65

3 P2 2 267632. 59 3p' «Pi 2s 2p2 (

4P)3p 3p «P° 1 368526. 37

57. 26

101. 12

5 P2 2 368583. 63

3s iPi 2s2 2p(2P°)3s 3s 1P° 1 273080. 07 6Ps 3 368684. 75 2p" 3P2 2p

4 2p4 3 P 2 283758. 9

-217. 7 -96. 7 4p

3P0 2s2 2p(2 P°)4p 4p 3P 0 370326. 7

89. 0

108. 5

3Pi

3Po

10 283976. 6 284073. 3

3 Pi

3P2

12370415. 7 370524. 2

3p iPi 2s2 2p(2P°)3p 3p »P 1 290956. 62 4p 4 D2 2s2 2p(,2 P°)4p 4p 4 D 2 370900. 6 3p 3 Di 2s2 2p(2 P°)3p 3p 3 D 1 293865. 26

136. 34

220. 05

4p ^0 2s2 2p(2 P°)4p 4p X S 0 373046. 2

3 D2 2 294001. 60

3 d3 3 294221. 65 3p' 3 Di 2s 2p2

(

4 P)3p 3p 3D° 1 374575 88

136. 1

3 D2 2 374662. 5

3p

3 Sj 2s2 2p(2 P°)3p 3p 3 S 1 297557. 50 3 d3 3 374798. 6 2p" 1 D2 2p4 2

p

4 iD 2 298289. 4 3p' 6S2 2s 2p2

(

4P)3p 3p 6S° 2 376067. 66

3p

3 P0 2s2 2p(2P°)3p 3p 3 P 0 300228. 21

82. 10

130. 54

4d 3F2 2s2 2p(2P°)4d 4d 3F° 2 377375

3Pi 1 300310. 31 3

3P2 2 300440. 85 4

3p ra2 2s2 2p(2P°)3p 3p *d 2 306584. 8 4d 4 D2 2s2 2p(2P°)4d 4d 1D° 2 377687

3p

1 So 2s2 2p(2 P°)3p 3p X S 0 313801. 07 3p' 3 P2 2s 2p2 (

4P)3p 3p 3P° 2 378408. 5 -12. 4 - 17. 2

3Pi 1 378420. 9

3d

3 F2 2s2 2p(2 P°)3d 3d 3F° 2 324462. 46 195. 79

178. 16

3Po 0 378438. 1

3F3 3 324658. 25

3 P< 4 324836. 41 4d 3 D! 2s2 2p(2 P°)4d 4d 3D° 1 379232

6163

3 D2 2 379293

3d *d2 2s2 2p(2P°)3d 3d 4D° 2 324734. 22 3d3 3 379356

3d 3Di 2s3 2p(2P°)3d 3d 3 D° i 327227. 94 49. 24 73.72

4d 3Pa 2s2 2p(2P°)4d 4d 3P° 2 380706

3D2 2 327277. 18 1

3d3 3 327350. 90 0

3d »P2 2s2 2p(2P°)3d 3d 3P° 2 329467. 98 -114. 00

-61. 45

4diF3 2s2 2p(2P°)4d 4d »F° 3 380782

3Pi 1 329581. 98

3 Po 0 329643. 43 4d 4Pi 2s2 2p(2 P°)4d 4d X P° 1 381086

3d iFj 2s2 2p(2P°)3d 3d iF° 3 331820. 2 2s2 2p(2P°)5s 5s 3P° 0

1 3d iPj 2s2 2p(2 P°)3d 3d ip° 1 332777.

5« 3P, 2 392221

3s' 6P, 2s 2p2

(

4 P)3s 3s «P 1 338565. 87 124.47

161. 16

5s 1P1 2s2 2p(2P°)5s 5s X P° 1 392778

5p2 2 338690. 34

fi P3 3 338851. 50 3s' 3D! 2s 2p2(2D)3s 3s' 3D 1 394090 36

69

3D2 2 394126

to xho 2p4 2p4 XS 0 343302. 6? 3 D3 3 394195
52

O in—Continued O m—Continued

Edl6n Config. Desig. J Level Interval Edl6n Config. Desig. J Level Interval

3

d' s Fi 2s 2p2 (

4P)3d 3d 5F 1 394516. 45

38. 70

57. 55

75. 74

92. 03

7d *F3 2s2 2p(2 P°)7d 7d 1 F° 3 422977

®F2 2 394555. 15 ®F3 3 394612. 70 3p' 1F3 2s 2p2

(

2 D) 3p 3p' 4 F° 3 424998

6 F4 4 394688. 44

6 f6 5 394780. 47 3

p' X D2 2s 2p2 (

2 D)3p 3p' 1 D° 2 426838

3d' 5 D0 *Th

2s 2p2 (

4P)3d 3d 6D 0

1 398135. 0 398131. 4

-3. 6 4 1 4

s' 5 Pi

6P2 2s 2p2

(

4 P)4s 4s 6P 12 428487

428606 119

6 D2 2 398127. 3

10 1

6Pa 3 428769 163

®D3 3 398137. 4 81.4 d4 4 398218. 8 3? 4Pi 2s 2p2

(

2 D) 3p *3p' 4 P° 1 480025

3d' ®P3 6p2 6 Pi

2s 2p2 (

4P)3d 3d ®P 3

2

1

398474. 3 398544. 3 398582. 8

-70. 0

-38. 5

4p' 3 Si 4p' 5 D0

2s 2p2 (

4 P)4p

2s 2p2 (

4P)4p

4p 3 S°

4p 6D°

10

487015. 0

3d' 3 P2

3 Pi

2s 2p2

(

4P)3d 3d 3 P 2

1 400354. 8 400464. 7

-109. 9 -53. 7

5 Di

®D2

12

438241. 0

438803. 2

62. 2

92. 0

122. 3

3Po 0 400518. 4

6d3 3 488895. 2

®d4 4 438517. 5

3d' 3 F2 2s 2p2

(

4P)3d 3d 3 F 2 401379 96

' 133.7

3 f3 3 401475. 4 4p' 5 Pl 2s 2p2

(

4 P)4p 4p EP° 1 489278. 1 51.4

98. 1

3f4 4 401609. 16 P2 2 439829. 5

5d

3F2 2s2 2p(2 P°)5d 5d3F° 2 401580

6p3 3 439427. 6

34

2s 2p2 (

4P)4p 4p 3 D° 12 5d

XD2 2s2 2p(2 P°)5d 5d »D° 2 401787

4p' 3D3 3 442710

2s2 2p(2 P°) 5d 5d 3 D° 1 O iv (

2 P^)

2s 2p2 (

4 P)4d

Limit 443193. 5

5d 3D3 2

3 402530 4d' ®P3 4d6 P 3 450167 -70

5d »F3 2s2 2p(2 P°)5d 5d 1F° 3 403374 -54

6 P2

6 Pi 2

1 450237

450291

5d !Pi 3d' 3 Dj

2s2 2p(2P°)5d

2s 2p2 (

4 P)3d

5d iP0 3d 3 D

1 403526

405805. 1 3d' 3 F 2s 2p2 (

2 D)3d 3d' 3F 2,3,4 452855

1

3 29 0 D2

3 d3 23

405834. 1 405883. 0

48. 9

3d' 3D 2s 2p2

(

2 D)3d 3d' 3 D 1, 2,3 454174

6d iDa 2s2 2p(J P°) 6d 6d 1 D° 2 414675

3d' 3 P 2s 2p2 (

2 D)3d 3d' 3 P 0,1,2 457634

2s2 2p(2 P°) 6d 6d 3 D° 1o

5d' 6P3 2s 2p2

(

4 P) 5d 5d 6P 473750

6d 3 D3 3 415181 1 December 1947. O hi Observed Terms*

Config.

ls2 +

Observed Terms

2s2 2p2 {2p2 4 S2p2 3P

2p2 4 D

2s 2p8 f2p3 ®S°

l 2

p

3

S° 2p3 3 P°

2p3 X P°

2p3 3 D°

2p3 iD°

2p4 {2p4 JS

2p4 3 P

2p4 4 D

ns (n^-3) np (n^;3) nd (n—3)

2s2 2p(2 P°)nx

{

3-5s 3 P°

3-5

4 P°

3, 4p 3 S

3, 4p iS

3, 4p 3 P 3, 4p 3 D

3, 4p iP 3, 4p iD

3, 4d 3 P°

3-5d ip°

3-6d 3 D°

3-6d X D°

3-5

3 F°

3-5, Id X F°

2s 2p2(4 P)nx

{

3, 4s 6 P

3s 3P

3p 6 S°

3, 4p 3 S°

3, 4p ®P° 3, 4p ®D°

3p 3 P° 3, 4p 3 D°

3-5d ®P 3d 3 P

3d ®D

3d 3 D

3d «F 3d 3 F

2s 2p2

(2D)rw;'

{

3s' 3 D

3p' 4 P° 3p' 4 D° 3p' X F°

3d' 3 P 3d' *D 3d' *F

* For predicted terms in the spectra of the C i isoelectronic sequence, see Introduction.
53

Oiv

(B i sequence; 5 electrons) Z=8

Ground state Is2 2s2 2p 2P|

2p 2Pi 624396.5 cm"1 I. P. 77.394 volts

Most of the terms are from Edl6n’s Monograph, corrected to agree with his 1935 paper,

in which he adds several terms from 2p2

(

1 D) and relabels his 2p2 (

3 P)3s 2P term as 2p2

(

1 D)3s 2D.

He also lists a combination in the visible, 3s'

2P° —dp' 2D, from which a revised value of 3s' 2P°

has been calculated. A few other additions and corrections kindly communicated by Edlen

have been incorporated into the table.

The term 6/

2F° is from the paper by Whitelaw and Mack.

No intercombinations between the doublet and quartet terms have been observed, but the

limits adopted by Edl6n are based on well-established series, and the relative positions of the

two groups of terms differ by probably only a small constant x. REFERENCES

L. J. Freeman, Proc. Roy. Soc. (London) [A] 127, 330 (1930). (T) (C L) B. Edl6n, Nova Acta Reg. Soc. Uppsala [IV] 9, No. 6, 87 (1934). (I P) (T) (C L) (G D)

P. G. Kruger and W. E. Shoupp, Phys. Rev. 44, 105 (1933). (T) (C L)

E. Edl6n, Zeit. Phys. 93, 726 (1935). (T) (C L) N. G. Whitelaw and J. E. Mack, Phys. Rev. 47, 677 (1935). (T)

B. Edl6n, unpublished material (Dec. 1947). (T)

O IV O iv

Edl6n Config. Desig. J Level Interval Edl6n Config. Desig. J Level Interval

2v 2s2 (

x S)2p 2p

2 P° X 0. 0

386. 5

3s' 2 Pi 2s 2p(3 P°)3s 3s 2 P° X 0

265. 0 J P2 1 X 386. 5

2 P2 I /2 453073. 0

2p' 4 Pi 2s 2p2 2

p

2 4 P X 71177. 0 +x

131. 4

184. 5

3

p' 2 P

2s 2p(3 P°)3p 3p 2 P X 467231. 1 115. 4 4 P2 1/2 71308. 4+x 2 P2 1 X 467346. 5

4 Ps 2/2 71492. 9 +x

3p' 4 Dj 2s 2p(3 P°)3p 3p

4 D X 468075. 4+z 7ft ft 2

p' 2 D3 2s 2p2 2p2 2 D 2/2 126936. 3 -14. 0

4 D2 1/2 468154. 2 +x

135 5 2 d2 1/2 126950. 3

4 d3 2/2 468289. 7+x

4 209. 7 d4 3z 468499. 4+x

2

p' »Si 2s 2

p

2 2

p

2 2 S X 164366. 9 3p' 4 S2 2s 2p(3 P°)3p 3p 4 S 1/2 474217. 8+x

2

p' *Pi 2s 2

p

2 2

p

2 2 P X 180481. 3

243. 3 2 P2 1/2 180724. 6 3p' 4 P1 2s 2p(3 P°)3p 3p 4 P z 478587. 7+x 94. 5

129. 1

4 P2 1/2 478682. 2+x

2p" 4 S2 2p

3 2p3 4 S° 1/2 231275. 1+x 4 P3 2Z 478811. 3+x

2 p" 2 D3

2 d2 2p

3 2p3 2 D° 2/2

1/2 255156. 7 255186. 0 -29. 3

3p' 2 D2 2 d3 2s 2p(3 P°)3p 3p

2 D iz

2/2 482667. 5 482923. 1 255. 6

2 p" 2 PX 2 P2 2p3 2

p

3 2 P° X

1/2 289016. 1 289021 0 7.9 4s 2 Si 2s2 OS) 4s 4s 2 S z 485823. 1

3s 2 S4 2s2 OS) 3s 3s 2 S X 357614. 8

3p' 2 S! 2s 2p(3 P°)3p 3p

2 S z 492880

3p 2 Pi

2 P2 2s2 pS)3p 3p 2P° z

1/2 390161. 1 390248. 2

87. 1 3d' 4 F2 4 f3 2s 2p(3 P°)3d 3d 4 F° IZ

2Z

494907. 5+x

494986. S+x 78. 8

112. 4 4 f4 3Z 495098. 7+x 154. 1 3d 2 D2 2s2 OS) 3d 3d 2 D 1 X 419533. 5

16. 7

4 f6 4Z 495252. 8+x

2 d3 2/ 419550. 2

3d' 4 DX 2s 2p(*P°)3d 3d 4 D° z 499506. 4+x 28 9

3s' 4 Pi 2s 2p(3P°)3s 3s 4 P° X 438588. 5+x 135. 1 246. 9

4 D2 iz 499535. S+x 46 7 4 P2 1/2 438723. 6+x 4 d3 2/2 499582. 0+x 64. 6 4 Pa 2/2 438970. 5+x 4 d4 3Z 499646. 6+x
54

O IV—Continued O IV—Continued

Edl6n Config. Desig. J Level Interval Edl6n Config. Desig. J Level Interval

3d' 2 Da 2s 2p(3 P°)3d 3d 2 D° ix 501511. 8

55. 1 4d' 2 D2 2s 2p(3 P°)4d 4d 2 D° 1/2 593627

2 81 D3 2y2 501566. 4

2 d3 2/2 593708

3d' 4 P3 2s 2p(3P°)3d 3d 4P° 2y2 50883/,. 5+x n q a. 4/' 2 F3 2s 2p (3 P°)4/ 4/ 2 F 2/2 594007

4 73 p2 i/2 508947. 9+x -73. 8

2 F4 3/ 594080

4 Pi X 504021. 7+x

4/' 2 D2 2s 2p(3 P°)4/ 4/ 2 D IX 594337

205 4d 2 D2 2s2 OS) 4d 4d 2 D ix 510560 7

2 D3 2/ 594542

2 d3 2x 510567

4d' 2 F3 2s 2p(3 P°)4d 4d 2 F° 2/ 596299

178 3d' 2 F3 2s 2p(3 P°)3d 3d 2 F° 2x 610746. 1 232. 4

2 F4 3/ 596477

2 F4 3y2 510978. 5

3p" 2 Si 2p2

(3 P)3p 3p" 2 S° H 597254

3d' 2 Pa 2s 2p(3P°)3d 3d 2 P° 1 X 514217 -151 2 Px x 514868

8/ *F 2s2 OS) 8/ 8/ 2 F° ( 2X

l 3X |

597352

3? 2 Pi 2s 2pOP°)3s 3s' 2P° X 518684 6 2 P2 1 X 518690 4d' 2 P2 2s 2p(3 P°)4d 4d 2 P° ix 597726

j -137 Pi X 597863

5s 2 Si 2s2 OS) 5s 5s 2S X 539368

3s" 2 D2 2p2 0D)3s 3s'" 2 D ix 600092

14

3

p' 2 D2 2s 2pOP°)3p 3p' 2 D 1/2 547311 25 *d3 2X 600106

2 d3 2y2 547336

3p' 2 P

2p2

(

3 P)3p 3p" 4 D° X

3p' 2 Pi 2s 2pOP°)3p X 549792 63 ix

2 P2 2s2 0S)5d 5d 2 D

1/2 ix

549855

3p" 4 D4 2X

3X 602977 +x

5d 2 D3 2y2 552034 2p2

(

3 p)3p 3p" 4 P° X

5/ 2 F 2s2 OS) 5/ 5/ 2F° f 2/2 l 3/2 J552490

3p" 4 P3 ix

2X 606484 +x

Sp^Si 2s 2pOP°)3p 3p' 2 S X 554461 3p" 2 D3 2p2

(

3 P)3p 3p" 2 D° 2X 615431 -29

4s' 4 Pi 2s 2p (3P°) 4s 4s 4P° X 568688 +x 135

247

2 d2 ix 615460

4 P2 4 p3 ix

2X

568778 +x

569020 +x 3p" 4 S2 2p2

(

3 P)3p 3p" 4S° IX 616588 +x

2s 2pOP°)3d 3d' *F° 2X OvOSo) Limit 624396.

5

3d' *F< 3X 570791 W2F 2p2 0D)3p 3p'" 2 F° r 2x

l 3X J624882

4s' *Pi 2s 2p(3 P°)4s 4s *P° X 573696 211

*P2 ix 578907

2s 2p(3 P°)5p 5p 2 P X

2s2 0S)6d 6d *D ix 5p' *P2 ix 628496

6d *D3 2X 574373

2p2

(3 P)3d 3d" 2F 2X

4p' 2 Pi 2s2 2p(3 P°)4p 4p 2 P X 575204

169

3d" 2 F4 3X 630095

2 P2 ix 575373

5p' ix 2 D2 2s 2p(3 P°)5p 5p*D 630703

176

3d' 2 D2 2 D3 2s 2pOP°)3d 3d' 2 D° iX

2X

575819

575853 34

2 D3 2X 630879

3d" 2 D3 2p2

(

3 P)3d 3d" 2 D 2X 632426 -168

3s" 4 P, 2p2

(3P)3s 3s" 4P X 576591 +x 144

2 d2 ix 632594

4 P2 ix 576735 +z 212 4 p3 2/2 576947 +z 2s 2p(3 P°)5d 5d 4 D° X

ix

3d' 2 P

i

2s 2pOP°)3d 3d' 2 P° X 581721 22 2X

2 P2 ix 581743 5d' 4 D4 3X 633896 +x

4p' 2 D3 2s 2p(3 P°)4p 4p 2 D IX 584552 216 5d' 4P3 2s 2p(3 P°)5d 5d 4 P° 2X 684245. 5+x

2 d3 2X 584768 ix

7/ 2 F 2s2 OS) 7/ 7/ 2F° f 2X

l 3/2 ^587850

5

d' 2 F3 2s 2p(3 P°)5d 5d 2 F°

X

2X 636024

2 212 F4 3X 636286

4p' 2 S 2s 2p(3 P°)4p 4p 2 S X 590071

4d 4 D° X

5d' 2 P2 2s 2p(3 P°)5d 5d 2 P° ix

X

6364921

2s 2p(*P°)4d

!X

2X 3d" 4 P3 2p2

(3 P)3d 3d" 4 P 2X 636851 +x -99

-62 4d' 4 D4 3X 591767 +x 4 p2 IX 636950 +x

4 Pi X 637012 +x

4d' 4P3 2s 2p(3P°)4d 4d 4 P° 2/ 592999 +x

[ IX

l 2X

IX

X

3d" 2 D 2p2 0D)3d 3d'" J D }646859
55

O IV—Continued

Edl6n Config. Desig. / Level Interval

3d" 2 F3 2p2 0D)3d 3d'" 2 F 2/ 651098

19 2 F4 3/ 651117

3d" 2 P2 2p2

(

1 D)3d 3d'" 2 P 1/2 653328 -83 2 Pi / 653411

2s 2p(3 P°)6d 6d 4 D° /

1/

2/

6d' 4 D4 3/ 656328 +x

2s 2p(1 P°)4p 4

p' 2 D 1/

4p' 2 D3 2/ 656748

W'tSi 2p2 0D)3d CO a 02 / 659998

2s 2p(1 P°)4d 4d' 2 D° 1/2 4

d' 2 Da 2/ 668538

2s 2p(3 P°) 7d 7d

4 D° /

1/

2/

7

d' 4 D4 3/ 669705 +x

December 1947.

CM Ph

So* ^*

1>

id* p

>

CO

Al

"S8

0 0 O Ph Ph pH Ph Ph CM

'is b b CO 10 CO CO CO

CO

0 0 0 p PP Q P P CM CM

V. b CD CO CO

CO COlO CO

O O O

Ph Ph Ph Ph Ph

-f CM CM CM

"e ’-S3 b 03

to »o CO CO CO 11

GQ

3

«

HH

fiH

>

«

H

02mO

H

cu>

X!O

CO

A!8N-/8,8

8. CM

Ph P^Ph a a ^ <M CM

8. CM

Ph8, CM

028. CM

T3

CO

Ph

8. CO

CO

Al8

PP'M* CM p PPCM 8. 8. CO no “a a*a

CO CO

1 CO CO

0

Ph

CM Ph Ph

-C* CM Ph

CM

0Ph 8, CO a a CO lO aCO aCO

CO mmCM mCM 0 0 mm

a a^ CO CO *a

CO

K V. a'a

CO CO

Ph Ph Ph Ph CM 00 00 tJHtJH 00 CO %

cdcd CO

02

CO iO

ct

be «a +Ch aCM

0Ph

OPh 02w

•fc. CM m 'a

CM 'a

CM

/*S Ph

(O^ n

<0 CO *a CMCO to to

CM CM CM e* CM CM Cvl 8. CM

*For

predicted

terms

in

the

spectra

of

the

Bi

isoelectronic

sequence,

see

Introduction.
56

OV

(Be i sequence; 4 electrons) Z=8

Ground state Is2 2s2

2s2 % 918702 cm"1 I. P. 113.873 volts

Edlen has revised and extended his published analysis and has generously furnished a manuscript copy of his complete term list in advance of publication, for inclusion here. He

states that no intersystem combinations have been observed and that the relative uncertainty

x in the position of the triplet terms with respect to the singlets may be ±100 cm-1

. In the published papers Edlen has used a prime to designate the terms from the 2P° limit

in O vi. REFERENCES

B. Edl6n, Nova Acta Reg. Soc. Sci. Uppsala [IV] 9, No. 6, 62 (1934). (I P) (T) (C L)

B. Edl6n, unpublished material (Dec. 1947). (IP) (T)

O v O v

Config. Desig. J Level

1 Interval Config. Desig. J Level Interval

2s2 2s2 iS 0 0 2p(2 P°)3p 3p 3 S 1 684124 +z

2s (

2S) 2p 2p *P° 0 82121. 2+x 136. 7

306. 2 2p(2 P°)3p 3p 3 P 0 689585. 6+x 114 0

1 82257. 9 +x 1 689699. 6+x 190. 7 2 82564. 1+x 2 689890. 3+x

2s(2S)2p 2p

iP° 1 158798 2p(2 P°)3d 3d iD° 2 694646

2p2 2

p

2 3 P 0 213641. 7+x 155. 7

268. 8 2p(2 P°)3p 3p 3 D 2 697170

1 213797. 4+x

2 214066. 2+x 2p(2 P°)3d 3d 3 D° 1 704360 +X 64

2 704424 +X 103

2p

2 2

p

2 »D 2 231722 3 704527 + x

2 p

2 2

p

2 iS 0 287909 2p(2 P°)3p 3p *S 0 707630

2s(2 S)3s 3s 3 S 1 547150. 0+x 2p(2 P°)3d 3d 3 P° 2 708154 +X 142

1 708296 +x -83

2s(2 S)3s 3s iS 0 561278 0 708379 +X

2s(2 S)3p 3p ‘P° 1 580826 2p(2 P°)3d 3d 1 F° 3 712967

2s(2 S)3p 3p

3 P° 0 582983. 6+x 36. 3

77. 3

2p(2 P°)3d 3d iP° 1 719277

1 583019. 9+x

2 583097. 2+x 2s(2 S)4s 4s 3 S 1 722666 +*

2s (

2 S) 3d 3d 3 D 1 600925. 5+x 10. 8

19. 8

2s(2 S)4s 4s } S 0 731667

2 600936. 3+x

3 600956. 1+x 2s(2 S)4p 4p 3 P° 0

1 736108 +x

18

2s(2 S)3d 3d iD 2 612617 2 736126 +X 2p(2 P°)3s 3s 3 P° 0 653099. 7+x 162 5

2s(2 S)4p 4p »P° 1 737883

1 653262. 2+x 342. 8

2 653605. 0+x 2s(2 S)4d 4d 3 D 1 742401 +x 614 2 742407 +X

2p(2 P°)3s 3s iP° 1 664486 3 742421 +x

2p(2P°)3p 3p JP 1 672695 2s(2 S)4d 4d iD 2 746280

2p{aT°)3p 3p

3 D 1 677333 +x 199 2s(2 S)4/ 4/ 1 F° 3 749857

2 677532 +x 315

3 677847 +x 2s(2S)5s 5s 3 S 1 796263 +X
57

O V—Continued O V—Continued

Config. Desig. J Level Interval Config. Desig. J Level Interval

2s (

2 S) 5p 5p >P° 1 802452 2s(2 S)7p 7p !P° 1 860874

2s (2S) 5d 5d *D 1o

2s (

2 S) 7d 7d 3 D 12

3 806625 +£ 3 861975 +x

2s(2 S)5d 5d *D 2 808351 2s (

2 S) 7d 7d »D 2 862419

2p(2 P°)4s 4s iP° 1 824280 2s(2S)8p 8p iP° 1 874447

2p(2 P°)4p 4p iP 1 829588 2s (2 S) 8d 8d

3 D 12 2p(2 P°)4p 4p 3 D 1 831047 +X 166 3 875365 +x

2 831213 +X

291

3 831504 +x 2p(2 P°)5p 5p *P 1 898580

2p(2P°)4p 4p 3S 1 832251 +x 2p(2P°)5p 5p 3 D 12 2p(2 P°)4p 4p *P 0

-fx

3 899671 +X

1 835151 170

2 835321 +X 2p(2 P°)5p 5p

3 P 0

1 2p(2P°)4d 4d 1 D° 2 887884 2 901344 +X

2p(2 P°)4p 4p iD 2 837864 2p(2 P°)5p 5p J D 2 902442

2s(2 S)6p 6p 1 839616 2p (2 P°)5<2 5d 1 D° 2 902592

2s(2 S)6/ 6/ 1 F° 3 840882 2p(2 P°)5d 5d

3 D° 19

2s(2 S)6d 6d *D 1o 3 904497 +X

3 841220 +X 2p(2 P°)5d 5d 2 F° 3 906404

2p(2P°)4d 4d 3 D° 1 841280

841874

+x 94

123

O vi (2 S#) Limit 918702

2 +X

3 841497 +X 2p(2 P°)6p 6p *P 1 935093

2s(2S)6d 6d J D 2 842105 2p(2 P°)6p 6p 3 D 19 2p(2P°)4d 4d 3 P° 2 843290 +X 1 07 3 935945 +X

1 843897 +X -52

0 843449 +X 2p(2 P°)6p 6p 3 P 0

1 2p(2P°)4d 4d iF° 3 847129 2 936805 +X

2p(2P°)4d 4d iP° 1 847465 2p(2 P°)6p 6p *D 2 937341

December 1947. O v Observed Terms*

Config.

ls2 +

Observed Terms

2s2 2s2 »S

2s(2S)2p

{

2p 3 P°

2p »P°

2p»

{ 2

p

2 iS 2p2 *P 2p2 ID

ns (n> 3) np (n>3) nd (n> 3) nf (n>4)

2s(2 S)nx coco -1Cn

Co

Go mm 3, 4p 3 P°

3-8p »P° 3-8d 3 D

3-7d J D 4, 6/ J F°

2p(2P°)nx 3s 3 P°

3, 4s »P°

3, 4p

3 S 3p >S 3-6p 3 P

3-6p iP

3-6p 3 D

3-6p iD

3, 4d 3 P°

3, 4d »P° 3-5d 3 D°

3-5d *D° 3-5d »F°

*For predicted terms in the spectra of the Be i isoelectronic sequence, see Introduction.

/
58

Z—S

O VI

(Li i sequence; 3 electrons)

Ground state Is2 2s 2Sa

2s 2S* 1113999.5 cm"1 I. P. 138.080 volts

This spectrum has been analyzed by Edl6n. The observed term values have all been

taken from a manuscript generously furnished by him in advance of publication. He remarks

that the np 2P° and nd 2D series have been observed in the vacuum spark further than given

in the table. For series members beyond n=6 he states that the term values calculated from

a Ritz formula are probably to be preferred.

In the table, extrapolated intervals and calculated term values are entered in brackets.

They have been taken from the 1933 and 1934 references below, as have also the entries in

column one. REFERENCES

B. Edl6n, Zeit. Astroph. 7, 378 (1933). (T) (C L)

B. Edl6n, Nova Acta Reg. Soc. Sci. Uppsala [IV] 9, No. 6, 44 (1934). (T) (C L)

F. Tyr6n, Nova Acta Reg. Soc. Sci. Uppsala [IV] 12, No. 1, 24 (1940). (C L) B. Edl6n, unpublished material (Sept. 1947). (T)

O vi O vi

Edlen Config Desig. J Level Interval Edl6n Config. Desig. J Level Interval

2s 2 Si 2s 2s

2S X 0. 0

6 F 6/ 6/

2 F° f 2ft

l 3X }

[1004265]

2p

2 P

i

2V 2p

2 P° X 96875. 0

532. 5 2P2 IX 96907. 5 f 3X 1 6 GH 6g, 6h 6<7 2 G, etc.

{ to \ [1004276]

3s 2 Si 3s 3s 2 S X 640039. 8 l 5X J 3v

2 Pi 3V 3V

2 P° X 666113. 2

156. 6 7 S 7s 7s 2S X 1030780

2 P2 IX 666269. 8

f X

3d 2 D2 3d 3d l ix 2D IX 674625. 7

51. 1 7 P 7P 7p

2 P°

J 1032630

2 D3 2X 674676. 8

f ix

4s 2 Si 4s 4s 2 S X 852696 1 2% 7 D 7d 7d 2 D

}

1033324

4V

2 Pi

2 P2 4p 4p

2P° X

IX

863383. 8

868397. 7

63. 9 7 F 7/ 7/ 2F° / 2X

l 3X }

[1033382]

4d 2D2 4d 4d 2 D IX 866880. 1 21. 4

r 3x ]

2 D3 2X 866901. 5 7 GHI 7g, etc. 7g

2 G, etc. < to } [1033389]

l 6X J 4/ 2 F3 4/ 4/ 2 F° 2X 867077. 7 9.8 2f4 3X 867087. 5 8 S 8s 8s [1050543] 2S X

5s 5s 2 S X 948690 8 P Sp 8p

2 P° f X

l ix |

1051724

5v

2 Pj 5p 5v

2 P° f X

l ix }

954080 [33] 8 F 8/ 8/

2 F° r 2K

i sh |

[1052280] 5d

2 D3 5d 5d 2D 1 IK

i 2a }

955856 [11]

f 3X

8 GHIK 8g, etc. 8g 2 G, etc. { to \ [1052285]

6 S 6s 6s

2 S X 1000080 l 7X J

6 P

6d

2D3

6p

6d

6p

2P°

6d

2 D

/ X

l ix

r ix

t 2X

|

1008130

}

1004178

8 D 8d 8d

2 D 1 ix

l 2X }

1052296

O vii OSo) Limit 1113999. 5

September 1947.
O vii

59

(He i sequence; 2 electrons) Z=S

Ground State Is2

Is2 5963000 + 600 cm"1 I. P. 739.114 ±0.074 volts

Five singlet lines have been observed by Tyr6n in the interval 17 A to 21 A. He has also

observed one intersystem combination—a line at 21.804 A classified as Is2 1 S0 —2p 3Pi. His

unit 103 cm-1 has here been changed to cm-1

. The triplet terms are from Edl6n, who has kindly furnished them in advance of publication.

He remarks that the extrapolated absolute term values of the triplets relative to those of the

singlets confirm the intersystem combination reported by Tyr6n. The 2s 3S—2_p

3P° combination has apparently not been observed, but Edl6n regards the extrapolation from the irregular

doublet law as very rebable. Brackets are used in the table to indicate extrapolated values not

yet confirmed by observation.

REFERENCES

F. Tyr6n, Nova Acta Reg. Soc. Sci. Uppsala [IV] 12, No. 1, 25 (1940). (I P) (T) (C L) B. Edl6n, unpublished material (Sept. 1947). (T)

O vii O VII

Config. Desig. J Level Interval Config. Desig. J Level Interval

Is2 Is2 iS 0 0 Is 3p 3p

iP0 1 5868550

Is 2s 2s 3 S 1 4525340 Is 4p 4p iP° 1 5628100

Is 2

p

2p

3P° 0 [4586170]

[60] [550]

Is 5p 5p

ip° 1 5748450

12 4586280

[4586780] Is 6p 6p

iP° 1 5818950

Is 2p

Is 3p

Is 3d

2p

iP°

3p

3 P°

3d 3 D

1 4629200

0, 1, 2 5856880 O viii (

2 S+) Limit 5963000

3, 2,1 5364990

September 1947. O VIII (H sequence; 1 electron) Z—8

Ground state Is 2Sx^

Is 2SH 7027970 cm-1 I. P. 871.12 volts

Tyren has observed the first Lyman line. J. E. Mack has calculated the terms in the

table, “using i? 0

16 = 109733.539, and A =0.040. The last digit is arbitrary, since the extrapolated ls-shift is 957 cm-1

. The series limits of O

17 and O

18 are higher than that for O16 by 14.3

and 25.8 cm-1

, respectively.”

REFERENCES

F. Tyr6n, Nova Acta Reg. Soc. Sci. Uppsala [IV] 12, No. 1, 24 (1940). (C L)

J. E. Mack, unpublished material (1949). (I P) (T) (C L)

O viii O viii

Config. Desig. J Level Interval Config. Desig. J Level Interval

Is Is 2 S y* 0 3s, etc. 3s 2 S, etc. y2 , etc. 6246978

to 7569

2V

2s

2p

2 P°

2s 2 S y

y2 5270363

5270483 11 120

J

| 1496 2p 2p

2 P° 1/2 5271859

oo =Limit 7027970

February 1949.
60

FLUORINE

Fi

9 electrons Z—9

Ground state Is2 2s2 2p6 2P^

2p* 2Pi^ 140553.5 cm-1

I. P. 17.42 volts

This spectrum is incompletely analyzed, but the terms from the 3P limit in F 11 are fairly

well established. The terms listed have been taken from Edl6n’s later paper, supplemented

by levels from further recent analysis by Liden. The new levels have been generously furnished in manuscript form by Edlen, for inclusion here.

Intersystem combinations have been observed, connecting the doublet and quartet terms.

Edl6n remarks that it is impossible to assign term designations to the levels labeled 3d X

and 4d X, because of the departure from LS'-coupling. He also states that the terms from

*D in F 11 need further confirmation. They are connected with the rest by only two ultraviolet

lines, those observed by Bowen at 806.92 A and 809.60 A.

REFERENCES

G. H. Carragan, Astroph. J. 63, 145 (1926). (Z E)

I. S. Bowen, Phys. Rev. 29, 231 (1927). (T) (C L)

B. Edl6n, Zeit. Phys. 93, 447 (1935). (C L)

B. Edl6n, Zeit. Phys. 98, 445 (1936). (I P) (T) (C L)

W. F. Meggers, J. Opt. Soc. Am. 36, 431 (1946). (Summary hfs) B. Edl6n, unpublished material (Dec. 1947). (T)

K. Lid6n, Ark. Mat. Astr. Fys. (Stockholm) 35A, No. 24, p. 5 (1948). (T)

Fi Fi

Edl6n Config. Desig. J Level Interval

2p

2 P2 2P, 2s2 2p5 2p

5 2 pO iy2 y2

0. 0

404. 0 -404. 0

3s 4 P3

4 P2 4 Pi

2s2 2p4

(

3 P)3s 3s 4 P 2y

1/2y2

102406. 50

102681. 24

102841. 20

-274. 74

-159. 96

3s 2 P2 2 Pi

2s2 2p4 (

3 P)3s 3s 2 P iy2 y2 104731. 86

105057. 10 -325. 24

PhPhPh

CO sa. 2s2 2p4 (

3 P)3p 3p

4 P° 2y2 1/2y2

115918. 70

116041. 69

116144. 89

-122. 99

-102. 70

3p 4 D4

4 d3 4 d2 4DX

2s2 2p4

(

3 P)3p 3p

4 D° 3X

2y

iy2 y2

116988. 21 117164. 83

117309. 87

117892. 77

-176. 62

-144. 54

-83. 40

Edl6n Config. Desig. J Level Interval

3p

2 D3 2d2 2s 2p4 (3 P)3p 3p 2 D° 2y2 iy2 117623. 78

117878. 75

-250. 02

3p

2 St 2s2 2p4

(3 P)3p 3p

2 S° y2 118406. 09

3p

4 S2 2s2 2p4

(3 P)3p 3p

4 S° 1 H 118428. 62

3p

2 P2

2 Pi

2s2 2p4

(

3 P)3p 3p 2 P° iy2 y2 118937. 61 119082. 63 -145. 02

3s 2 D3 2 d2 2s2 2p4 (

4 D)3s 3s' 2 D 2y2 1 y2 123925. 50

123926. 56

-1. 06

3d 4 D4

4 d3

4 d2

4 Di

2s2 2p4 (

3 P)3d 3d 4 D 3/2 2y2 1 %

y2

128064. 90

128088. 63

128123. 51 128185. 80

-23. 73

-34. 88

-62. 29
61

F I—Continued F I—Continued

Edl6n Config. Desig. J Level Interval Edlen Config. Desig. J Level Interval

3d X8 2s2 2p4 (

3 P)3d 3d Z4 128141. 27 2s2 2p4 (

3P)4d 4d 4 F 4X 133606. 39 -317. 44

-8. 73

-39. 50

3X 133923. 83

3d 4 F5 2s2 2p4

(

3 P)3d 3d 4 F 4K 128219. 92 -295. 63

-10. 60

-86. 58

2 V2 133932. 56

4 f4

4 f3 <f2

3/2 2 X

1 H

128515. 55

128526. 15

128612. 73 2s2 2p4 (

3 P)4d 4d Z3

IX 133972. 06

133607. 33

3d X7 2s2 2p4

(

3 P)3d 3d Z2 128220. 65 2s2 2p4

(

3 P)4d 4d Z2 133624. 61 3d X8 2s2 2p4 (

3 P)3d 3d Z3 128221. 16 2s2 2p4 (

3 P)4d 4d Zi 133644. 4 3d X8 2s2 2p4 (

3 P)3d 3d Y3 128339. 53 2s2 2p4 (

3 P)4d 4d Y, 133911. 08

3d X4 2s2 2p4

(

3 P)3d 3d Y2 I/2 128524. 09 2s2 2p4

(

3 P)4d 4d Y2 133920. 20

3d X3 2s2 2p4 (

3 P)3d 3d Y4 128606. 88 2s2 2p4 (

3 P)4d 4d Yx 133966. 47

3d X2 2s2 2p4 (

3 P)3d 3d X2 128698. 68 2s2 2p4 (

3 P)4d 4d X2 134085. 53

3d X3 2s2 2p4 (

3 P)3d 3d X4 128713. 12 2s2 2p4 (

3 P)4d 4d Xt 134092. 03

2s2 2p4 (

3 P) 5s 5s 4 P 132596. 26 -149. 51 -264. 19

3p

2 F3 2s2 2p4 (

4 D) 3p 3p’ 2 F° 2y2 137591 63

8. 81 I/2 132745. 77 2 F4 3x 137603. U

X 133009. 96

3p

2 D2 2s2 2p4 (

4 D)3p 3p’ 2 D° 1 X 138700. 15

7. 86

2s2 2p4 (

3 P)5s 5s 2 P IX

y2 132999. 16

133224. 10 -224. 94

2 d3 2x 138708. 01

2s2 2p4 (

3 P)4d 4d 4 D 3 x 133545. 27 -12. 87

-20. 01 -35. 95

2X 133558. 14 F 11 (

3 P2) Limit 140553. 5

1 X 133578. 15 y2 133614. 10 2

p' 2 S4 2s 2p6 2

p

6 2 S y2 [168554]

2s2 2p4 (

3 P) 4d 4f Z, 1 33584. 35

December 1947.

F i Observed Terms*

Config.

ls2 +

Observed Terms

2s2 2

p

5 2pS 2p°

ns (n> 3) np (n> 3) nd (n> 3)

2s2 2pi

(

3 'P)nx / 3, 5s 4 P

\ 3, 5s 2 P

3p

4 S°

3p 2 S°

3

p

4 P° 3p 4 D°

3p 2 P° 3

p

2 D°

3, 4d 4 D 3, 4d 4 F

2s2 2p4

(

1 D)rca;' 3s' 2 D 3p' 2 D° 3p' 2 F°

*For predicted terms in the spectra of the F i isoelectronic sequence, see Introduction.
62

(O i sequence; 8 electrons)

Ground state Is2 2s2 2jp

4 3P2

F ii Z=9

2p4 3P2 282190.2 cm"1 I. P. 34.98 volts

Bowen, Dingle, and Edl6n have all contributed to the analysis of this spectrum. The

singlet and triplet terms are taken from Edl6n, who has revised and extended the earlier work.

The quintet terms, except 5/

6F, are from Dingle’s paper. The term 5/5F derived by Edl6n

agrees well with the 4/ 6F term and Dingle’s series limit.

The singlet and triplet terms are connected by intersystem combinations. The relative

position of the quintets is determined by the series with the uncertainty x probably not

exceeding 200 cm-1

. Edl6n lists a number of combinations that probably involve 2s2 2_p

3 (

2D°)4/ terms at about

288600 ± cm-1 above the ground state. In a private communication Edl6n has stated that his term published as 3d 3D should have

the designation 4s 3P. He has also revised his published value of 3d' 4S

0

. REFERENCES

H. Dingle, Proc. Roy. Soc. (London) [A] 128, 600 (1930). (T) (C L)

I. S. Bowen, Phys. Rev. 45, 82 (1934). (T) (C L)

B. Edl6n, Zeit. Phys. 93, 433 (1935). (I P) (T) (C L)

B. Edl^D, private communication (Dec. 1947). (T)

F II F II

Edl6n Config. Desig. J Level Interval Edl6n Config. Desig. J Level Interval

2p

3 P2 2s2 2p4 2p4 3 P 2 0. 0 -341. 8

-148. 8

2s2 2p3

(

4 S°)3d 3d 6 D° 4 281158. 08+x -0. 91 -1. 20 -0. 68 -0. 52

3 Pi

3 Po

10

341. 8

490. 6 32

1

281158. 99 +x

231160. 19+x

281160. 87 +x

2p

1 D2 2s2 2p4 2p4 X D 2 20873 0 281161. 89 +x

2p

XS0 2s2 2p

4 2p4 X S 0 44919 3d 3 Di 2s2 2p3

(

4 S°)3d 3d 3 D° 1 282064- 18

0. 80

2. 08 2p' 3 P2

3 D2 2 232064. 98

2s 2p

5 2ps 3po 2 164797. 7 -309. 4 - 173. 9

3 d3 3 232067. 06

3 Pi 1 165107. 1

3Po 0 165281. 0 2s2 2p3 (4 S°)4s 4s 6 S° 2 285811. 15+x

2s2 2p3

(

4 S°)3s 3s ®S° 2 176654.2 +x ^‘Pi 2s2 2p3

(2 D°)3p 3p' X P 1 235643. 1

3s 3 Si 2s2 2p3

(4 S°)3s 3s 3 S° 1 182865. 2 3p

3 Di 2s2 2p3

(

2 D°)3p 3p' 3 D 1 236170. 35

2. 72

22. 50

3 D2 2 236173. 07

2s2 2p3

(

4 S°)3p 3p

6 P 1 202609. 65 +x 11. 33

19. 55

3 d3 3 236195. 57

2 202620. 98+x

3 202640. 53 +x .4s 3 Si 2s2 2p3 (

4 S°)4s 4s 3 S° 1 286961. 63

3v

3 Po 2s2 2p3

(

4 S°)3p 3p

3P 0 207702. 91 -3. 00

4. 70

3p

3 F4 2s2 2p3 (2 D°)3p 3p' 3 F 4 237507. 91 -0. 81 -0. 65

3Pi 1 207699. 91 3 f3 3 237508. 72

3 P2 2 207704. 61 3 f2 2 237509. 37

3s 3 D3 2s2 2p3

(2 D°)3s 3s' 3 D° 3 211866. 62 91 07 3p

x F3 2s2 2p3

(2 D°)3p 3p' »F 3 238323. 6

3

3 d2 2 211887. 69 - 13. 03 D, 1 211900. 72 2p' x Pi 2s 2pB 2ps ip° 1 239605. 0

3s x D2 2s2 2p3

(

2 D°)3s 3s' X D° 2 215069. 8 3p 3 P2 2s2 2p3 (2 D°)3p 3p' 3 P 2 240093. 10 -60. 24 -26. 57

Ts X Pl 2s2 2p3

(

2 P°)3s 3s" XP° 1 227228. 2

3 Pi

3 Po

10

240153. 34

240179. 91 Is 3 P2 2s2 2p3

(2P°)3s 3s" 3P° 2 229550. 88 -1. 61 -2. 66

3p x D2 2s2 2p3

(

2 D°)3p 3p' X D 2 246283. 9

3Pi

3Po

10229552. 44

229555. 10 4p

3 P0 2s2 2p3 (4 S°)4p 4p3 P 0 246655. 10

7. 45

20. 12

3 Pi 1 246662. 55

3P2 2 246682. 67

5 3s, 2s2 2p3 (

2P°)3p 3p" 3S 1 253313. 2
63 F II

Continued

Edl6n Config. Desig. J Level Interval

2s2 2p3 (4 S°)4d 4d 3 D° 1o 4d 3D3 3 25^016

4/ 3 F 2s2 2p3 (4 S°)4/ 4/ 3F 4, 3,2 254547. 3 % 3 D3 2s2 2p3 (2P°)3p 3p" 3 D 3 254702. 30 -15. 06

-6. 60 3 d2 3D4 21 254717. 36

254723. 96

2s2 2p3 (4 S°)4/ 4/ 6F 5 to 1 254703. l+x

Ip *Pi 2s2 2p3 (2 P°)3p 3p" X P 1 255606. 0 5 3 P0 2s2 2p3 (2P°)3p 3p" 3P 0 257253. 9

14 9 3 Pi 1 257268. 8

23. 9 3P2 2 257292. 7 3p X D2 2s2 2p3 (2P°)3p 3p" XD 2 258930. 0

5/ 5F 2s2 2p3 (4 S°)5/ 5/ fi F 5 to 1 264610 +x

3d 3F2 2s2 2p3 (2 D°)3d 3d' 3 F° 2 264953. 12

5. 51

7. 28 3 f3 3 264958. 63 3f4 4 264965. 91 3d »S 0 2s2 2p3 (2 D°)3d 3d' iS° 0 264994. 9

3d 3 G5 2s2 2p3 (2 D°)3d 3d' 3 G° 5 265255. 8 -12. 0 — 21. 5 3 G4 4 265267. 8 3 G3 3 265289. 3

3d

x G4 2s2 2p3 (2 D°)3d 3d' X G° 4 265310. 1 3d 3D3 2s2 2p3 (2D°)3d 3d' 3 D° 3 265472. 70 -26. 04 - 18. 40 3 d2 3 Di 21 265498. 74

265517. 14

3d

x D2 2s2 2p3 (2 D°)3d 3d' iD° 2 266270. 2

3p J S0 2s2 2p3 (2 P°)3p 3p" XS 0 266338. 4

3d 3 Si 2s2 2p3 (2 D°)3d 3d' 3 S° 1 266360. 69

3d 3 P2 2s2 2p3 (2D°)3d 3d' 3P° 2 266454. 27 -44. 85

-17. 23 3 Pi 1 266499. 12 3 Po 0 266516. 35

3d

xF3 2s2 2p3 (2 D°)3d 3d' XF° 3 266548. 7

3d iPj 2s2 2p3 (2 D°)3d 3d' iP° 1 267400. 3

4s 3 D3 2s2 2p3 (2 D°)4s 4s' 3D° 3 269548. 7 -15. 5 -10. 3 3 d2 3 d4 21 269564. 2

269574. 5

4s iD2 2s2 2p3 (2 D°)4s 4s' 1D° 2 270508. 4 Fra (4 S^)

2s2 2p3 (2P°)3d

Limit 282190. 2 H 3F4 3d" 3 F° 4 282544- 7 -25. 0 -17. 2 3 f3 3 282569. 7 3 f2 2 282586. 9 H x d2 2s2 2p3 (2 P°)3d 3d" 2D° 2 282774. 7 H 3Po 2s2 2p3 (2P°)3d 3d" *P° 0 282897. 0

16. 4

34. 5 3 P1 1 282913. 4 3 P2 2 282947. 9

Id iF* 2s2 2p3 (2P°)3d 3d" XF° 3 283409. 4 35*Pi 2s2 2p3 (2 P°)3d 3d" XP° 1 284224. 8 H 3D3 2s2 2p3 (2P°)4s 4s" 3P° 2 286701. 9 -4. 7 -0. 7 3d2 1 286706. 6 3 Dj 0 286707. 3

December 1947. s«HHo>«H

CDKo soH

T3

4»>

X!o A

C5

Ph

eo'a

<N o o

Ph Ph

CO

tO to

55.

A

<N <N

zn

55. <N

Al

COAl

'e

COAl

5£ V-/

©0S

PhPh

ioof o o CO

co co O O 0 0 PhPh fcPn 'O'O A

coco o o fifl

to co "S'TS CO TjH O O PP

'O'O

CO CO o o OP o o znzn

to eo

CO CO

co O O O O Ph Ph Ph Ph

CO CO

'O'O

CO CO

Vss,

coco PP PP

COAl3 WCO CO

wCO CO ag

Ph Ph

>o CO Ph Ph

CO Ph Ph

A 55, CO co

A

A

coco "Ws.

CO CO mmCOWCO CO o o

Ph Ph

bO , «C +C3 %

°4S o om P o

Ph Zs C9 CO CO CO 55.

to a 55, 55, <N <N (M CO

c* eo c C9 co co 00 09 CO <N <N <N <N

*For

predicted

terms

in

the

spectra

of

the

Oi

isoelectronic

sequence,

see

Introduction.
64

Fra

(N i sequence; 7 electrons) Z=9

Ground state Is2 2s2 4S°ii

2p3 4Si| 505410 cm-1

I. P. 62.646 volts

The terms are from the paper by Edl6n. With the aid of observations in the extreme ultraviolet he has extended the analysis by Bowen and Dingle and derived improved values of the

series limits. He has found the sextet terms and estimated their position relative to the other

terms. The value of x is somewhat uncertain. Bowen found 14 intersystem combinations

connecting the doublet and quartet terms.

The term 3p" 2P° depends upon the combination with 3s" 2S, assigned to a pair of lines

at 2920 A. According to Edl6n this classification is somewhat uncertain.

REFERENCES

H. Dingle, Proc. Roy. Soc. (London) [A] 122, 144 (1929). (T) (C L)

I. S. Bowen, Phys. Rev. 45, 82 (1934). (T) (C L) B. Edl6n, Zeit. Phys. 93, 433 (1935). (I P) (T) (C L)

Fill Fra

Edl6n Config. Desig. J Level Interval

2p

4 S2 2s2 2p3 2p3 4 S° 1/2 0

2p

2 D3 2 D2 2s2 2p3 2p3 2 D° 2/2 1/2 smu

341 20

-36

2p

2 Pl2 2s2 2p3 2p3 2 P° J 1/2

l / | 51558

2

p' 4 P3 4 p2 4 Pi

2s 2p4 2pi <p 2/2 1/2z

151897. 9

152235. 3

152410. 0

-337. 4 -174. 7

2

p' 2 D3 2d2 2s 2

p

4 2p4 2 D 2/2 I /2 210240

210256

-16

2p' 2Sj 2s 2

p* 2p4 2 S z 248260

2

p' 2 P2 2 Pi

2s 2p

4 2

p

4 2 P 1/2z

266559

266943 -384

3s 4 PX 4P2

4 p3

2s2 2p2 (

3 P)3s 3s 4 P z

1/2 2Z

316707. 3 316918. 6 317237. 5

211. 3

318. 9

Edl6n Config. Desig. J Level Interval

3s 2 Pi 2s2 2p2

(

3 P)3s 3s 2 P z 324489. 9

2 384. 5 P2 1/2 324874. 4

3s 2 D3 2s2 2p2

(

4 D)3s 3s'

2

2 D 2/2 344016. 2 -3. 3 d2 1/2 344019. 5 3p 2 Si 2s2 2p2

(3 P)3p 3p 2 S° z 344438. 4 3p 4 Di 2s2 2p2 (

3 P)3p 3p 4 D° z 348700. 5

114. 9

189. 7

258. 9

4 D2 !Z 348815. 4

4 d3 2/2 349005. 1

4 d4 3/2 349264. 0

3p

4 Pi 2s2 2p2

(3 P)3p 3p

4 P° z 351234- 1 94. 3

188. 7

4 P2 1/2 351328. 4

4 p3 2/2 351517. 1 3p 2 D2 2s2 2p2

(

3 P)3p 3p 2 D° 1Z 355979. 6

2 390. 4 d3 2/2 356370. 0

3p 4 S2 2s2 2p2

(

3 P)3p 3p 4 S° 1/2 357477. 0
65

F m—Continued F m—Continued

Edl6n Config. Desig. J Level Interval Edlen Config. Desig. J Level Interval

3p

2Pi 2s2 2p2 (

3 P) 3p 3p 2 P° X 86. 9 4p 4 Di 2s2 2p2 (

3 P)4p 4p 4 D° X 426426. 0

130. 4

174. 3

256. 8

2 P2 i X 560^33. I

4 D2 1 H 426556. 4

4 d3 2

x/2 426730. 7

3s 2 SX 2s2 2p2

(

x S)3s 3s" 2 S X 372673. 0 4 D4 3H 426987. 5 3p 2 F3 2s2 2p2

(

x D)3p 3p' 2 F° 2X 376806. 2

64. 8 4p 4 Pi 2s2 2p2

(

3 P)4p 4p 4 P° /4 1/2 427456. 7

85. 7

186. 9

2 F4 3/2 376871. 0

4 P2 427542. 4

2/2

4 p3 2)4 427729. 3

3?? 2 D3 2s2 2p2 (

x D)3p 3p' 2 D° 380242. 9 -56. 2 4p 2 D° 1/2 2 d2 1/2 380299. 1 4p 2 D2 2s2 2p2 (

3 P)4p 429105. 3

395. 3

X

2 d3 2/2 429500. 6

3p

2 Pi 2s2 2p2

(

x D)3p 3p' 2 P° 384360. 9

134. 3

2s2 2p2

(

3 P)4p 4p 2 P2 1 X 384485. 2 4p 2 P° H

2 Pj 431057. 1

2 167. 1 P2 1/2 431224. 2

3d

4 F2 2s2 2p2 (

3 P)3d 3d 4 F 1/4 387257. 3

108. 9

155. 6

203. 7 2/2

4 f3 2/2 387366. 2 3

p' 4 P3 2s 2p3 (

5 S°)3p 3p'" 4 P 434546. 3 -20. 7

-14. 6

4 f4 3H 387521. 8

4 p2 1/2 434567. 0

4 f6 4/4 387725. 5

4 Pi 434581. 6

ec 2s2 2p2

(

3 P)3d 3d 2 P 1H 389523. 5 389735. 7 -212. 2 4s 2 D23 2s2 2p2

(

x D)4s 4s' 2 D J 2H

l 1/2 |440830

3d 4 Di 2s2 2p2 (

3 P)3d 3d 4 D H 390118. 4 -40. 1 -2. 6

132. 7

4d 2 P2 2s2 2p2

(

3 P)4d 4d 2 P 1/2 441159

4 -225 D2 1/2 390078. 3

2 Pi J4 441384

4 d3 4 d4 2H

3/2 390075. 7 390208. 4 4d 4 P3 2s2 2p2

(

3 P)4d 4d 4 P 2/2 442153 -147

-78 4 p2 1/2 442300

3d 4 P3 2s2 2p2

(

3 P)3d 3d 4 P 2/4 390832. 3 -141. 7 -71. 24 Pi 442378

4 p2 1/2 390974. 0

4 Pi 391045. 2 4d 2 F3 2s2 2p2

(

3 P)4d 4d 2 F 2/2 442280

2 354 f4 3/2 442634

3d 2 F3 2s2 2p2

(

3 P)3d 3d 2 F 2

x/2 391255. 6

369. 9 2 F4 3>4 391625. 5 3d 2 D23 2s2 2p2

(

x S)3d 3d" 2 D ; i]4

l 2H j-442760

3s' «S3 2s 2p3

(

6 S°)3s 3s'" «S° 2/2 391910. 0 +x

4d 2 D2 2s2 2p2

(

3 P)4d 4d 2 D 1 Y2 444960 48 3d 2 D2 2s2 2p2

(

3 P)3d 3d 2 D 1/4 395266. 1 118. 0

2 d3 2)4 445008

2 d3 2

x/2 395384. 1 3d' «D5 2s 2p3 (

5 S°)3d 3d'" 8 D° 4)4 462930. 7+x -2. 6 -3. 8

Q A

2p" 2P2 2p6 2

p

5 2 P° 401203 -518

6 d4 3y2 462932. 7+x

2 Pi 401721 «d3 2)4 462936. 5+x

6 d2 I /2 462939. S+x -2. 5

3s' 4 S2 2s 2p3

(6 S°)3s 3s'" 4 S° 1/2 404778 ®D1 462942. 4+x

3p

2 Pj 2s2 2p2

(

x S)3p 3p" 2 P° J4 406899. 2

4. 1 5d 4 P3 2s2 2p2

(3 P)5d 5d

4 P 2/2 465409

2 P -132 2 1/2 406903. 3 4 Pl2 1 iy2 l /2 1465541

3d 2 F4 2s2 2p2

(

x D)3d 3d' 2 F 3H 413136. 1 -51. 0 2 f3 2/2 413187. 1 5d 2 D23 2s2 2p2

(3 P)5d 5d 2 D / in

1 2/2 |466293

3d 2 Gfi 2s2 2p2

(

x D)3d 3d' 2 G 4/2 414887. 0 -3. 1

2 G4 3H 414890. 1 4d 2 F34 2s2 2p2 (

x D)4d 4d' 2 F

/ 3/2

1 2/2 j-466810

4s 4 Pj 2s2 2p2

(

3 P)4s 4s 4 P H 415188

4 P2 4 P3 1/2 2>4 415714 4d 2 D23 2s2 2p2 (

x D)4d 4d' 2 D / 1/2

1 2/2 |466964

3d 2 D2

2 d3 2s2 2p2

(

x D)3d 3d' 2 D 1/2 2/2 416160. 7 416178. 1 17. 4 4d 2 P12 2s2 2p2

(

x D)4d 4d' 2 P / y2 1 1/2 }467798

4s 2 Pi 2s2 2p2(3 P)4s 4s 2 P y2 417581 387 3d' 4 D4 2s 2p3

(

6 S°)3d 3d'" 4 D° 3)4 467868. 9 -0. 4

-1.0

2 P2 417968 4 d3 2/2 467869. 3

3d 2 Pi 2s2 2p2

(

x D)3d 3d' 2 P V2 418180. 6

60. 3

4 L>12 {

1)4

l X 1 467870. 3

2 P2 418240. 9

3s' 2 D3 2s 2p3 (

3 D°)3s 3slv 2 D° 2)4 474869 -44

3d 2 SX 2s2 2p2

(

x D)3d 3d' 2 S 420997. 9

2 d2 1/2 474413

3

p' «P2 # P3 2s 2p3 (

6 S°)3p 3p'" 6 p 14/2 2/2 425239. 6 425261. 3 +x

+X 21. 7

36. 1 5d 2FM 2s2 2p2

(

x D)5d 5

d' 2 F

i 2H } 489494

6 P4 3/2 425297. 4 +X

4p

2 Si 2s2 2p2

(

3 P)4p 4p 2 S° H 425388. 9

5d 2 D23 2s2 2p2

(

x D) 5d 5

d' 2 D f IX

1 2H } 490140

F iv(3P0) Limit 505410

January 1947.
66

F m Observed Terms*

Config.

ls2 +

Observed Terms

2s2 2p

3 |

2p

3 4S°

2p

3 2 P° 2p3 2 D°

2s 2p

i { 2p* 2 S

2pi 4P

2p* 2P 2p* 2 D

2p

6 2p

5 2 P°

ns (n> 3) np (n> 3) nd (n> 3)

2

s

2 2p2

(3P)nx f 3, 4s 4 P 3p 4 S° 3, 4p 4 P° 3, 4p 4 D° 3-5d 4 P 3d 4 D 3d 4 F

X 3, 4s 2P 3, 4p 2 S° 3, 4p 2P° 3, 4p 2 D° 3, 4d 2 P 3-5d 2 D 3, 4d 2F

2s2 2p2 (

1 D)nz' 3, 4s' 2 D 3p' 2P° 3p' 2 D° 3p' 2 F° 3d' 2 S 3, 4d' 2P 3-5d' 2 D 3-5d' 2 F 3d' 2 G

2s2 2p2

(

1 S)nx" 3s" 2 S 3p" 2 P° 3d" 2 D

2s 2p3 (

BS°)m"' /3s'" «S° 13s'" 4 S°

3p'" 6P

3p'" 4 P

3d'" «D°

3d'" 4 D°

2s 2pi3

(3 D°)nxiy 3s^ 2D°

*For predicted terms in the spectra of the N i isoelectronic sequence, see Introduction.

F IV

(C I sequence; 6 electrons) Z=9

Ground state Is2 2s2 2p2 3P0

2p

2 3P0 703766.4 cm"1 I. P. 87.23 volts

The first work on this spectrum was by Bowen. Edl6n has greatly extended the earlier

analysis. About 250 lines in the intervals 140 to 679 A and 2171 to 3176 A are now classified.

The terms are from Edl6n, who has rejected two terms in his published list, 4d' 3 S and 3s' 3 S. Extrapolated values are entered in brackets in the table.

The singlet and triplet terms are connected by intersystem combinations. No such combinations involving quintet terms have been observed. The uncertainty x may reach 50 to 100 cm-1

. REFERENCES

B. EdlSn, Zeit. Phys. 92, 19 (1934). (I P) (T) (C L)

B. Edl6n, private communication (Dec. 1947). (T)
67 F iy F iv

Edl6n Config. Desig. J Level Interval Edlen Config. Desig. J Level Interval 2p 3 P0 2s2 2p* 2p2 3 P 0 0. 0 225 2 3

p' 5 Pj 2s 2p2 (4 P)3p 3p 5P° 1 542578. 3+x 114 9

202. 0 3 Pi 1 225. 2

388. 2 5 P2 2 542693. 2+x 3 P2 2 613. 4

fi P3 3 542895. 2+x 2p *D2 2s2 2p2 2p2 iD 2 25241 3p' 3 Dj 2s 2p2 (4 P)3p 3p 3 D° 1 550918

180

2p2 4 S 53544 3 D, 2 551098 2p 'So 2s2 2p2 0 3L>3 3 551366 268 2

p' 6 S2 2s 2p3 2p3 «S° 2 2s 2p2(4 P)3p 3p 3P° 0 2

p' 3 D3 3 d2 2s 2p3 2p3 3 D° 32

147841. 8

147888. 9

-47. 1 -12. 7 3

p' 3 Pi 3 P2 12 556051

556316 265 1 147901. 6 4s 3 P0 2s2 2p(2 P°)4s 4s 3 P° 0 559747

134 2 423 p' 3 P2 3 Pj

2s 2p3 2p3 3P° 21 175237. 0

175242. 0

-5. 0 -22. 1 3 Pi 3 P2 12 559881

560304 3 Po 0 175261 1 4s J Pi 2s2 2p(2 P°)4s 4s 4 P° 1 561267

2p' iDa 2s 2p3 2p3 1D° 2 228908 3? 3 Dj 2s 2p2 (2 D)3s 3s' 3 D 1 567900

119

2p' »Si 2s 2p® 2p 156 3 3 S° 1 238297. 2 3 D2 3 d3 23 568019

568175

2p' iPj 2s 2p3 2p3 ipo 1 257390 3d' 5 F! 2s 2p2 (4 P)3d 3d 5F 1 [576581] +z

[75] 2p4 348327. 0 5F2 2 576656. 1+x 2p" 3 P2 2p4 3 P 2 —443 0 5f3 3 576768. 2+x 112. 1 3Pi 1 348770. 0 - 193. 0 5f4 4 576916. 6+x 148. 4 3 Po 0 348963. 0 sf6 5 577100. 1+x 183. 5

3s 3 P0 2s2 2p(2P°)3s 3s 3 P° 0 416417. 3 222—5 3d' 5 D0 2s 2p2 (4P)3d 3d 5D 0 581806. 1+x 5. 

17. 1 43. 7

105. 3 3 Pi 1 416639. 8

503. 6 5 T>i 1 581811. 5+x 3 P2 2 417143. 4 5 D2 2 581828. 6+x

®d3 3 581872. 3+x

3s iPj 2s2 2p(2P°)3s 3s ip° 1 423606. 4 6 d4 4 581977. 6+x

3p 3 Di 2s2 2p(2 P°)3p 3p 3D 1 451819. 6 261 5

3d' *P3 2s 2p2(4 P)3d 3d 6P 3 583547 +x -150

-101 3 d2 2 452081. 1 436. 0 5 P2 2 583697 +x 3 d3 3 452517. 1

fi Pi 1 583798 +x

3p 3 Sj 2s2 2p(2 P°)3p 3p 3 S 1 456884 3 3d' 3 P2 2s 2p2 (4 P)3d 3d 3P 2 585201 -224

-106 3 Pi 1 585425

3p 3 P0 2s2 2p(2 P°)3p 3p 3P 0 460215. 2

170. 6 254 8 3 Po 0 585531 3 Pi 1 460385. 8 3 P2 2 460640. 6 3

s' j D2 2s 2p2(2 D)3s 3s' iD 2 586263 3p iDa 2s2 2p(2P°)3p 3p 3 D 2 469644 2 4d 3 F2 2s2 2p(2 P°)4d 4d 3 F° 2Q

586641 3d 3F2 2s2 2p(2P°)3d 3d 3F° 2 492395. 1 463. 7

347. 4 u4 3 f3 3 492858. 8

2s2 2p(2 3f4 4 493206. 2 4d iD2 P°)4d 4d ID 0 2 587130 3d *D2 2s2 2p(2P°)3d 3d iD° 2 492864 3d' 3 F2 2s 2p2(4 P)3d 3d 3F 2 588021 202

255 3 f3 3 588223 3d 3 Di 2s2 2p(2P°)3d 3d 3 D° 1 497481. 4 94 2

153. 5 3 f4 4 588478 3 D2 2 497575. 6 3 d3 3 497729. 1 4d 3 D! 2s2 2p(2 P°)4d 4d *D° 1 589109

79 218 3 D2 2 589188

3d 3P2 2s2 2p(2P°)3d 3d 3 P° 2 500390. 1 -212. 0

-114 4 3 d3 3 589406 3 Pi 3Po 10

500602. 1 500716. 5 4d 3 P2 2s2 2p(2P°)4d 4d 3 P° 2 590024 -177

-61 3 Pi 1 590201

3s' 3Pj 2s 2p2(4P)3s 3s 6P 1 502723. 0+z 241. 4

318. 0 3Po 0 590262 6P2 2 502964 4+a: 6p3 3 503282. 4+x 4d 4 F3 2s2 2p(2P°)4d 4d 1 F° 3 592240

3d »F3 2s2 2p(2 P°)3d 3d J F° 3 505421. 4 4d J Pi 2s2 2p(2P°)4d 4d !P0 1 592674

3d iPj 2s2 2p(2P°)3d 3d 1 P° 1 506514 3d' 3 D! 2s 2p2(4P)3d 3d *D 1 595331 7278 3 D2 2 595403

3s' 3 P0 2s 2p2 (4 P)3s 3s 3P 0 519341

198

351 3 d3 3 595481 3 Pi *P2 12 519539

519890 3

p' »F3 2s 2p2 (2 D)3p 3p' iF° 3 609811 3

p' 3 Si 2s 2p2 (4 P)3p 3p 3S° 1 534686 3pfl D2 2s 2p2 (2 D)3p 3p' iD° 2 612830 3

p' «D„ 2s 2p2(4 P)3p 3p 6D° 0 [538507] +2

[66] 135. 9

200. 6

256. 3 3p' 'Pi 2s 2p2 (2 D)3p 3p' 4 P° 1 618889 £ Dx 1 538573. 3+2

*d2 2 538709. 2+

5d 3 F2 2s2 2p(J P°)5d 5d 3 F° 2 629547 5l>3 3 638909. 3+2 3 ®d4 4 539166. 1 +2 4
68

F IV—Continued F IV—Continued

Edl6n Config. Desig. J Level Interval Edl6n Config. Desig. J Level Interval

5d »D2 2s2 2p(2P°)5d 5d !D° 2 680019 3d' »F3 2s 2p2

(

2 D)3d 3d' 4 F 3 657546

2s2 2p(2 P°)5d 5d 3 D° 1o

3d' *D2 2s 2p2

( 2 D)3d 3d' 4 D 2 657800

5d

3 D3 3 681126 3d' l J?i 2s 2p2

(2 D)3d 3d' 4 P 1 658629

5d

3 P2 2s2 2p(2P°)5d 5d

3 P° 2 [681486] r lorn 2s 2p2

(4 P)4p 4p 3D° 1

3 Poi 1,0 631546 2

4

p' 3 D3 3 662848

5d

3 FS 2s2 2p(2 P°)5d 5d

1 F° 3 682780

2s 2p2

(4 F)4p 4p 3 P° 0

5d iPi 2s2 2p(2 P°)5d 5d J P° 1 682740 1 4p' 3 P2 2 665409

3d' 3 F234 2s 2p2

( 2 D)3d 3d' 3F 2, 3,4 644224

4d' S P3 2s 2p2

(

4 P)4d 4d 5P 3 675110 +x i no

2s 2p2

(4 P)4s 4s 6P 1

5 Pl 2 2, 1 675309 +x — iyy

4s' S P2 2 645504 Q9Q

6 p3 3 645827 +x 040

4d' 3 F2 2s 2p2

(

4 P)4d 4d 3 F 2 677467

3 f3 3 677667 zuu

2s 2p2

(

2 D)3d 3d' 3 P 0

1

3 f4 4 677906 zdy

3d' 3 P2 2 6488.27 4d' 3 D3 2s 2p2

(4 P)4d 4d 3 D 1,2 679798

3 d12 3 679994 iyo

3d' 3 D12 2s 2p2

(2 D)3d 3d' 3 D 1,2 650196 14ft

3 d3 3 650342 F v (2 P£) Limit 703766.4

2s2 2p(2 P°)6d 6d 3 D° 1 2s 2p2

(

4 P)5p 5p 3 D° 1 2 2

6d

3 D3 3 653606 5p' 3 D3 3 710760

6d

3 P2 2s2 2p(2 P°)6d 6d 3 P° 2 658772 61 5

d' ®P3 2s 2p2

(

4 P)5d 5d 5P 3 716878 +x ono

3 Poi 1,0 658883 S Pl2 2,1 717080 +z

6d

1 F3 2s2 2p(2 P°)6d 6d 1F° 3 654469 4d' 3 F234 2s 2p2

(

2 D)4d 4d' 3 F 2, 3,4 738996

3d' 3 Si 2s 2p2

( 2 D)3d 3d' 3 S 1 654739

December 1947.

F iy Observed Terms*

Config.

ls2 +

Observed Terms

2s2 2p

2 { 2p2 4 S 2p2 3P

2p2 iD

2s 2P3 r 2 p® «s°

^ 2p3

3

S° 2

p

3 3 P°

2p3 iP° 2p3 3 D°

2p3 iD°

2p* 2p4 3 P

ns (n> 3) np (n> 3) nd ( n> 3)

2s* 2p(2P°)na; {

3, 4s 3 P°

3, 4s *P° 3p 3 S 3p 3P 3p 3 D

3p »D

3-6d 3 P°

3-5d 4 P°

3-6d 3 D°

3-5d J D°

3-5d 3 F°

3-6d 1 F°

2s 2p2

(

4P)na; {

3, 4s 6P

3s 3 P 3p 3 S°

3p «P° 3p 5 D°

3, 4p 3 P° 3-5p

3 D°

3-5d 6P

3d 3P

3d S D

3, 4d 3 D

3d 5 F

3, 4d 3 F

2s 2p2

(

2 D)nx'

{

3s' 3 D

3s' »D 3p' 4 P° 3p' »D° 3p' 1 F°

3d' 3S 3d' 3 P

3d' »P

3d' 3 D

3d' >D

3, 4d' 3F

3d' 4 F

*For predicted terms in the spectra of the C i isoelectronic sequence, see Introduction.
69

FV

(B i sequence; 5 electrons) Z=

9

Ground state Is2 2

2 2p 2P*

2p 2P$ 921450 cm-1

I. P. 114.214 volts

All of the terms are from an unpublished manuscript kindly furnished by Edlen. He

has revised and extended his earlier analysis. The notation in the left column is from his

published papers.

No intersystem combinations have been observed. The position of the quartet terms

relative to the doublets may be in error by ±100 cm"1 according to Edlen. This uncertainty

is indicated by x in the table.

REFERENCES

B. Edl6n, Zeit. Phys. 89, 597 (1934); 93, 26 (1934); 94, 56 (1935). (I P) (T) (C L). B. Edl6n, unpublished material (Dec. 1947). (I P) (T).

FV FV

Edl6n Config. Desig. J Level Interval Edl6n Config. Desig. J Level Interval

2p

2 Pi 2s2 0S)2p 2p

2 P° H 0

746 3s' 2 R 2s 2p(3 P°)3s 3s 2 P° y 638856

2 509 P2 iy2 746 2 P2 1/2 639365

2

p' 4 Pi 2s 2

p

2 2p24P H 86035+x 252

364

3p' 2 Pi 2s 2p(3 P°)3p 3p 2 P / 656208

4 228 P2 ih 86287+x 2 P2 1/2 656436

4 Pa 2/ 86651 +x

3p' 4 Dj 2s 2p(3 P°)3p 3p 4 D / 657988+x 146

2

p' 2 Ds 2s 2

p» 2p22D 2/ 152876 -22 4 D2 1/2 658134+x 266 2 d2 1/2 152898 4 d3 2/ 658390+x 401 4 D4 3/2 658791+x

2

p' *Si 2s 2

p

2 2p2 2 S H 197565

3

p' 4 S2 2s 2p(*P°)3p 3p 4 S iy 666240 +x

2

p' 2 Pi 2s 2P2 2p22P y2 214881

2 467 P2 i/ 215348 3

p' 2 D2 2s 2p(3 P°)3p 3p 2 D 1 / 675932 490 2 d3 2/ 676422

2p" 4S2 2p3 2p3

S° i/2 276657 -\-x 3p' 2 Sj 2s 2p(3P°)3p 3p 2 S n 687806

2p" 2 D3 2p5 2p

3 2 D° 2/ S07226 -47

1 1/

2 d2 1/2 S0727S 3d' 4 D12 2s 2p(3 P°)3d 3d 4 D°

}

697817+x 102

2p" 2 Pi 2p* 2p

3 2P° y2 347418 204 d3 2 / 697919+x 136 2 P2 1/2 347438 4 d4 3/ 698055+x

3s 2 Si 2s2 OS) 3s 3s 2 S H 524751 3d' 2 D2 2s 2p(3P°)3d 3d 2 D° 1 / 699293 96 2 d3 2/2 699389

3p

2 Pi 2s2 OS) 3p 3p 2P° H 565367

2 177 P2 1/2 565544 3d' 4 P3 2s 2p(3P°)3d 3d 4 P° 2/2 702908+x 209 4 p2 1/2 703117+x -142

3d 2 D2 2s2 OS) 3d 3d 2 D 1/2 602476 40

4 Pi / 703259 +x

2 D* 2/ 602516

J H

3s' t 1/2 4P4 2s 2p(3 P°)3s 3s 4P° / 621138+x 257

468

3? 2 P12 2s 2pOP°)3s 3s' 2P°

}

712755

4P2 1/2 621895+x

4 Ps 2y2 621868+x
70

F V—Continued F V—Continued

Edl6n Config. Desig. / Level Interval

.

Egl6n Config. Desig. Level Interval

3

d' 2F3 2s 2p (

3 P°)3d 3d 2F° 2K 712840 466 2s 2p (

3 P°)4d 4d 2 D° 1/ 841598

2F 97

4 3y 718806 2y 841695

4s »Si 2s2

(

1 S)4s 4s 2 S 712936 4d' 4 P3 2s 2?>(3 P

0 )4d 4d 4P° 2y

1/2y

842452 +x

3d' 2P2 2s 2p(3P°)3d 3d 2P° iy 718472

2 -219

Pi y 718691

1/2 2s2

(

x S)6d 6d 2 D iy

4d 2 D2 2s2

(

1 S)4d 4d 2 D 744010 26 2y 843497

2 d3 2/2 744036

1/2 3p" 2 F3 2252 (!D)3?5 3p'" 2 F° 2y 844H2

154 3p' 2 D2 2s 2p(}Y°)3p 3p' 2 D 751406 46

2 F4 3y 844266

2 d3 2M 751452

4d' 2 F3 2s 2p (

3 P°)4d 4d 2 F° 2y 847506 311

3p' 2 Pj 2s 2p (

1 P°)3p 325' 2P /2 752529 127

2F4 3y 847817

2 P2 iy 753656

2p2

(

3 P)3d 3d" 2 P iy 853035 -407

3p' 2 Si 2s 2p('T°)3p 3p' 2 S y 760342 y 853442

f 2/

l 3/2

2p2 i}~D)3p 3p' n 2 D° iy

3d' 2 F34 2s 2p OP0

) 3d 3d' 2 F°

j

788650 2y 854971

2p2

(

3P) 3s 3d" 4 P3 2p2

(

3 P)3d 3d" 4P 2y 860421 +x -198

-106 3s" “Pi 3s" 4 P X

ix

784343 +x 261

4 p2 iy 860619+x

4P2 784604+x 410

4 Pi X 860725+x

4p3 2y 785014+x

3d' 2 D2 2s 2p(1 P°)3d 3d' 2 D° IX 787725 39

3d" 2 D

2p2

(

x D)3d 3d'" 2 D / iy

l 2y }

873904

2 d3 2% 787764

c 1/ 3d" 2 F34 2p2

(

x D)3d 3d'" 2 F f 2y

l 3y } 880312

3d' 2P12 2s 2p OP0

) 3d 3d' 2P° J /2 l iy |

793308 J 3d" 2 Pi 2p2

(

x D)3d 3d'" 2 P y 882930

153 3s" 2 Pi 2p2

(

3 P)3s 3s" 2P y 797059 460

2P2 iy 883083

2P2 1/2 797519

2s 2p (

3 P°)5s 5s 4 P° y

5d 2 D3 2s2

(

1 S)5d 5d 2 D 1 X 808663 14 iy

2y 808677 2y 892180+x

4s' 4P3

2s 2p(3 P°)4s 4s 4P° y

iy

2s 2p(3P°)5p 5p 2 D iy

2y

901487

902012 525

2/ 810298+x

/ 1/2

l 2/2

2s 2p (

3 P°)5d 5d4 D° y

37" 2 D 2p2

(

x D)3s

2p2

(

3P)3p

3s'" 2 D

}

811075

5d' 4 D

iy

2y

3y 906074+

x

3p" 4 D° /2 1/ 816518+x 241 2s 2p (

3 P°)5d 5d 4P° 2y 906565 +x

3p" 4 D4 2/0 816759+x 342 iy

2p2

(

3 P)3p 3

2?" 4 P°

3/

y

817101+x

Fvi (

X S0) Limit

y

921450

CO Ifr. hd 1/2 823375+x 250

2y 828625 +x 2s 2j5(3P°)6d 6d

4 D° y

2s 2p(3 P°)4p

iy

425 2 P / 829436 271 2y

1/2 829707 3y 940921 +x

4p' 2 D2 2s 2p (

3 P°)4p 4p 2 D 1/2 833501 419 2s 2p(3P°)6d 6d 4P° 2y 941286 +x

2 D3 2y 833920 iy

3p" 4 S2 2p2

(3 P)3p 3p" 4 S° 1 / 834790+x

72

2s 2p(3 P°)4p

2p2

(3P)4d 4d" 4P 2y 998189+x

425 2 S y 838036 iy

y

2s 2p (

3 P°)4d 4d 4 D° ; /

1 1 / | 841087+x 58

4d' 4 D4 2y 841095+x 210 3/2 841805+x

December 1947.
71

F y Observed Terms*

Config.

ls2 +

Observed Terms

2s2

(

J S) 2p 2p

2 P°

2s 2p

2 w 2 S

2p

2 4 P

2p2 2P 2p

2 2 D

2p* |2p

3 4 g

° 2p3 2po 2p3 2 D°

ns (n>3) np (n> 3) nd (n> 3)

2s2 pS)nz 3, 4s 2 S 3p

2 P° 3-6d

2 D

2s 2p(3 P°)nx

{

3-5

4 P°

3s 2 P°

3p

4 S

3, 4p 2 S 3, 4p 2 P

3p

4 D

3-5p

2 D

3-6d

4 P°

3d 2 P°

3-6d

4 D°

3, 4d 2 D° 3, 4d 2 F°

2s 2p(1 P°)nx' 3s' 2 P° 3p' 2 S 3p' 2 P 3p' 2 D 3d' 2 P° 3d’ 2 D° 3d’ 2 F°

2p2

(

3P)nx"

{

3s" 4 P

3s" 2 P

3p" 4 S° 3p" 4 P° 3p" 4 D° 3, 4d" 4 P

3d" 2 P

2p2

(

1 D)nx"' 3s"' 2 D 3p"' 2 D° 3p'" 2 F° 3d'" 2 P 3d’" 2 D 3d'" 2F

*For predicted terms in the spectra of the B I isoelectronic sequence, see Introduction.

F VI

(Be i sequence; 4 electrons) Z—9

Ground state Is2 2s2 XS0

2s2 % 1267581 cm"1 I. P. 157.117 volts

Edlen has revised and extended his published analysis and has generously furnished a manuscript copy of his complete term list in advance of publication, for inclusion here.

In the published papers he has used a prime to designate the terms from the 2P° limit

in F vii. Intersystem combinations connecting the singlet and triplet systems of terms, have been

observed.

REFERENCES

B. Edl6n, Zeit. Phys. 89, 179 (1934). (I P) (T) (C L)

B. Edl6n, Zeit. Phys. 94, 56 (1935). (T) (C L) B. Edl6n, unpublished material (Dec. 1947). (I P) (T)
72 F vi F VI

Config. Desig. J Level Interval Config. Desig. J Level Interval

2s2 2s2 J S 0 0 2p(2 P°)3d 3d 3 P° 2 938524 -287

-147 1 938811

2s(2S)2p 2p 3P° 0 96601 200 0 938958 12 96861

97437 576

2p (2 P°)3d 3d iF° 3 947305

2s(2 S)2p 2p J P° 1 186841 2p(2 P°)3d 3d »P° 1 953402

2p2 2p2 3P 0 251341 9Q4 2s(2 S)4s 4s 3 S 1 989928 1 251635 510 2 252145 2s(2 S)4s 4s »S 0 997693 2p2 2p2 ID 2 274597 2s(2 S)4p 4p l P° 1 1007852 2p2 2p2 iS 0 340424 2s(2 S)4d 4d 3 D 19

2s(2 S)3s 3s 3 S 1 747298 3 1014439

2s(2 S)3s 3s »S 0 764392 2s(2 S)4d 4d iD 2 1019363

2s(2 S)3p 3p 1 P° 1 787833 2s(2 S)5s 5s 3 S 1 1093463

2s (2 S) 3p 3p 3P° 0 2s(2 S)5p bp 1 P° 1 1099409 1 790326 148 2 790474 2s(2 S)5d 5d 3 D 1o

2s (2 S) 3c? 3d 3 D 1,2 812169 39 3 1106417 3 812208

2s(2 S)5d 5d iD 2 1108712

2s (2 S)3d 3d »D 2 826853

2p(2 P°)4s 4s »P° 1 1112328

2p(2 P°)3s 3s 3P° 0 871160 281 1 871441 4p »P 637 2p(2 P°)4p 1 1115967 2 872078

2p(2 P°)4p 4p 3 D 1 1117498 243

532 2p(2 P°)3s 3s »P° 1 884290 2 1117741 3 1118273

2p (2 P°)3p 3p »P 1 895287

2p(2 P°)4p 4p 3 S 1 1121377

2p(2 P°)Zp 3p 3 D 1 900442 4p 2 900785 3 P 612 2p(2 P°)4p 0 3 901397 1 1122468

194 2 1122662

2p(2 P°)3p 3p 3 S 1 909316

2p(2 P°)4p 4p J D 2 1126152

2p(2 P°)3p 3p 3 P 0 915196 094 1 915420 350 2p(2 P°)4d 4d iD° 2 1126168 2 915770

4d 2p( 3 D° 1 2 P°)4d

2p(2 P°)3d 3d J D° 2 921821 23 1130339

2p(2 P°)3p 3p *D 2 925393

2p(2 P°)4d 4d 3 P° 2 1131653 -204

2p(2 P°)3d 3d 3 D° 1 933586 131 203 1 1131857 2 933717 0 3 933920

2p(2 P°)4d 4d »F° 3 1135953

2p{2 P°)Zp 3p

iS 0 934633

2p(2 P°)4d 4d »P° 1 1137535
73

F VI—Continued F VI—Continued

Config. Depig. J Level Interval Config. Desig. J Level Interval

2s (

2 S) 6p 6p »P° 1 116U88 2p(2 P°)5d 5d 3 D° 19

2s(2S)6d 6d

3 D 1o

3 1220940

3 1156097 2p(2 P°)5d 5d 3 P° 2

i 1221541

2s (2S) 6d Qd iD 2 1157385 0

2s(2 S)7p 7p »P° 1 1184469 2p(2 P°)5d 5d iF° 3 1223598

2s (

2 S) 7d 7d 3 D 19

2p(2 P°)5d 5d iP° 1 1224285

3 1185884 2p(2 P°)6p 6p 3 D 19

3s (

2 S) 7d 7d X D 2 1186611 3 1266672

2s(2 S)8d 8d 3 D 1o Fvii (2 S^) Limit 1267581

3 1205139 2p(2 P°)6p 6p

3 P 0

1 2p(2 P°) 5p 5p 3 D 19

2 1267616

3 1215055 2p(2 P°)6p 6p

X D 2 1268554

2p(3 P°)5p 5p

3 P 0

i 2p(2 P°)6d 6d 3 D° 19 2 1216995 3 1269888

2p(2 P°)5p 5p iD 2 1218588 2p(2 P°)6d 6d X F° 3 1271437

2p(2 P°)5d 5d iD° 2 1218786 2p(2 P°)7d 7d 3 D° 19

3 1299418

December 1947.

F yi Observed Terms*

Config.

ls2 +

Observed Terms

2s2 2s2 iS

2s(2 S)2p

{ 2p

3 P°

2p iP°

2p

2 { 2p2 iS 2p2 3P

2p2 X D

ns (»>3) np (n>3) nd (n> 3)

2s(2 S)n# / 3-5s 3 S

\ 3, 4s iS

O

£hPh o

CO

CO 1

3-8d 3 D

3-7d X D

2p(2 P°)na:

{ 3s 3 P°

3, 4s X P°

3, 4p 3 S

3p X S

3-6p 3 P

3, 4p X P

3-6p 3 D

3-6p X D

3-5d 3 P° 3-7d 3 D°

3-5d X P° 3-5d *D° 3-6d X F°

*For predicted terms in the spectra of the Be i isoelectronic sequence, see Introduction.
74

F YII

(Li i sequence; 3 electrons) Z=9

Ground state Is2 2s 2Si

2s 2Sj 1493656 cm-1I. P. 185.139 volts

The analysis is by Edl6n, who, in 1934, published a list of nine classified lines in the range

between 86 A and 134 A. He has recently extended the analysis and has generously furnished

his unpublished term list for use in the present compilation. All terms in the table have been

taken from the later list, although the entries in column one are from the earlier paper.

Edl6n remarks that the up 2P° and nd 2D series have been observed in the vacuum spark

further than indicated in the table, but beyond n—6 the term values calculated from a Ritz

formula are probably to be preferred.

REFERENCES

B. Edl6n, Zeit. Phys. 89, 179 (1934). (T) (C L)

B. Edl6n, unpublished material (Sept. 1947). (I P) (T)

F vii F vii

Edl6n Config. Desig. J Level Interval Edlen Config. Desig. J Level Interval

2s 2 S 2s 2s 2 S X 0 6s 6s 2 S X 1339216

2v

2 Pi

2 P2 2V 2p

2 P° X

iy2 112258

118235 977 6p 6p

2 P° / X

l ix |

1342877

3s 2 S 3s 3s 2 S y2 854625

6d 6d

2 D ! IX

l 2/ }

1344141

3 v

2 Pi 3 V 3v

2 P° y2 885136 282 2P2 iy2 885418 7s 7s 2 S X 1380775

3d 2 D2

2 d3 3d 3d

2 D 1 X

2H

895632

895722 90 7V 7p

2 P° { X

1 ix |

1382858

4s 2 S 4s 4s 2 S 1140416

7d 7d

2 D { ix

l 2/2 }

1383841

4p aP2 4p 4p

2 P° / y2 l i X }

1152977

8V 8p

2 P° / X

l IX |

1408848

4d 4d 2 D IX 1157223 32

4d 2 D3 2/2 1157255

8d 8d

2 D f 1/2

l 2/2 } 1409538

5s 5s 2S X 1269826

5p 5v

2 P° / X

l 1 X

f IX

1 2/2

}

1276194 F viii (

1 S0 ) Limit 1493656

5d

2 D3 5d 5d

2 D

|

1278404

September 1947.
75

Fvm

(He i sequence; 2 electrons) Z=9

Ground state ls21S0

1$21S0 7693400 ±800 cm"1 I. P. 953.60±0.10 volts

Flemberghas classified three lines between 13 A and 16 A as the first three members of the

singlet series. Tyren has also observed the first two members of this series and classified a line

at 16.951 A as the intersystem combination Is2 ^o—2p

3 Pi. Tyren’s value of the limit is quoted here. The unit, 103 cm-1

, has here been changed to cm-1

. Edlen has extended the analysis and has generously furnished his unpublished manuscript

containing absolute values of the triplet terms extrapolated along the He i iso electronic sequence.

The relative positions of the singlet and triplet terms thus determined confirm the intersystem

combination reported by Tyren. The 2s 3 S—2_p

5P° combination has apparently not been

observed, but Edlen regards the extrapolation from the irregular doublet law as very reliable.

Brackets are used in the table to denote extrapolated values not yet confirmed by observation.

REFERENCES

F. Tyr6n, Nova Acta Reg. Soc. Sci. Uppsala [IV] 13, No. 1, 25 (1940). (I P) (T) (C L)

H. Flemberg, Ark. Mat. Astr. Fys. (Stockholm) 28A, No. 18 p. 34 (1942). (T) (C L)

B. Edl6n, unpublished material (Sept. 1947). (T)

F vill F VIII

Config. Desig. J Level Interval Config. Desig. J Level Interval

Is2 Is2 2 S 0 0 Is 3d 3d 3 D 3, 2,1 [6912360]

Is 2s 2s 3 S 1 [5829920] Is 3p 3p 1 6916590

Is 2p 2p

3 P° 0

1 [5899150]

5899810 [160]

[950]

Is 4p 4p

J P° 1 7256680

2 [5900260]

Is 2p 2p

lP° 1 5949900 Fix (

2S*) Limit 7693400

September 1947.
NEON

Nel

10 electrons Z=10

Ground state Is2 2s2 2p6 2 S0

2p6 X S0 173931.7 cm-1

I. P. 21.559 volts

The present list has been compiled from an unpublished manuscript kindly furnished by

Edlen, who has made a study of the terms of this spectrum and interpreted them with the aid

of present atomic theory. His term array is based on that published by Meggers and Humphreys in 1933, although he has revised and extended their list. Three place values are from

measures made with the interferometer. His predicted values of five /-levels are entered in

brackets in the table.

Edlen has determined the new values of the series limits quoted here.

The classical work by Paschen on Ne i forms the basis of all subsequent investigations.

His notation has, therefore, been retained in column one of the table, except for his fractional

numerical prefixes for levels from an s-configuration, m=1.5, 2.5, etc., which are listed as 1, 2, etc., in accord with the 1933 term table mentioned above. The letters U, V, X, Y, Z adopted

later when configurations involving /-electrons were found, are also entered in this column.

Eleven levels in the latter group have (/-values fixed by the observed combinations listed in

the 1933 reference below. These (/-values are entered in italics in the table.

Edlen suggested that a pair-coupling notation be adopted for Ne-like spectra to take into

account the departure from AS-coupling. According to Shortley, X/S-designations can be

significantly assigned in only a few cases, in particular, for the following groups of levels:

Paschen Desig. Paschen Desig. Paschen Desig.

(71-2) ss ns 3 P2 2pio 3 v

3 Si 2Vh 3p J Pi (n—2) Si ns 3 Pi

(n-2)s3 ns 3 Pg 2p9 3V

3 D3 2pi 3v

3 P2 2p8 3p 3 D2 2p3 3 V

3 Po (n-2) s2 ns J P! 2p7 3p

3 Di 2p2 3p3 Pi

2p6 3p

1 D2 2pi 3 p %

Consequently, the ^-coupling notation in the general form suggested by Racah is here introduced. The present arrangement has been suggested by Shortley, who has made a detailed

investigation of the theoretical arrangement of the “pairs,” to be used as a guide in preparing

the present table. Pairs are separated only the case of np [%], where the interval is large.

Twenty lines of Nei in the range between 5852 A and 7032 A have been measured relative to the primary standard, and are regarded as accurate to eight figures. They have been adopted

by the International Astronomical Union as secondary standards of wavelength.
77

Ne I—Continued

REFERENCES

F. Paschen, Ann. der Phys. [4] 60, 405 (1919). (T) (C L)

W. Grotrian, Phys. Zeit. 21, 638 (1920). (G D)

F. Paschen, Ann. der Phys. [4] 63, 201 (1920). (T) (C L)

E. Back, Ann. der Phys. [4] 76, 330 (1925). (Z E) N. Ryde, Zeit. Phys. 59, 836 (1929). (T) (C L) K. Murakawa and T. Iwama, Sci. Papers Inst. Phys. Chem. Research (Tokyo) 13, No. 254, 289 (1930). (Z Ei

W. F. Meggers and C. J. Humphreys, Bur. Std. J. Research 10, 429, RP540 (1933). (T) (C L)

J. C. Boyce, Phys. Rev. 46, 378 (1934). (I P) (T) (C L)

W. F. Meggers, J. Research Nat. Bur. Std. 14, 490, RP781 (1935). (C L) Trans. Intern. Astr. Union 5, 86 (1935). Y. Ishida and T. Tamura, Sci. Papers Inst. Phys. Chem. Research (Tokyo) 29, 9 (1936). (T) (C Li

P. Jacquinot, Compt. Rend. 202, 1578 (1936). (Z E) R. Ritschl und H. Schober, Phys. Zeit. 38, 6 (1937). (I S) C. J. Humphreys, J. Research Nat. Bur. Std. 20, 24, RP1061 (1938). (T) (C L)

J. B. Green and J. A. Peoples, Jr., Phys. Rev. 54, 602 (1938). (Z E) G. Racah, Phys. Rev. 61, 537 (L) (1942). B. Edl6n, Ark. Mat. Astr. Fys. (Stockholm) 29A, No. 32, p. 2 (1943). (C L)

J. B. Green, Phys. Rev. 64, 151 (1943). (Z E)

B. Edl6n, unpublished material (March 1948). (I P) (T) G. Shortley, unpublished material (Aug. 1947).

Ne I Ne I

Paschen Config. Desig. j Level Obs. g Paschen Config. Desig. J Level Obs. g

2

pe 2p« iS 0 0

o /*// OS i 2p5 (

2 P£)3d 3d' [2nr 2 162410. 617 0. 781

3s"' 3 162412. 138 1. 125

ls6 2p«(2 P!*)3s 3s [i y2y 2 134048. 790 1. 503 3s'i

ff 3d' [i nr 2 162421. 944 1. 242

ls4 1 134461. 237 1. 464 3S; 1 162437. 642 0. 752

lS3 2p6

( 2 P£) 3s 3s' [ nr 0 134820. 591

ls2 1 135890. 670 1. 034 co 5*© 2p«(2 P^)4p 4p [ H] 1 162519. 850 1. 929

3 p9 ff 4P [2H] 3 162832. 683 1. 328

2pio 2p5( 2 P4 ^)3p 3 V [ HI 1 148259. 746 1. 984 3p8 2 162901. 093 1. 112

2Pi

ff 3p [2H\ 3 149659. 000 1. 329 3 pi

ft 4P [1 HI 1 163014. 600 0. 974

2Vi 2 149826. 181 1. 137 3p6 2 163040. 330 1. 360

2p7 ff 3v [m 1 150123. 551 0. 669 3 pz

ff 4V [ H] 0 163403. 281

2pn 2 150317. 821 1. 229 n

3p [ H]

3Ph 2p5

( 2 P£)4p 4p' [1/4] 1 163659. 248 0. 685

2p3 0 150919. 391 3Pi 2 163710. 581 1. 184

2p6 2p‘(2 P£)3p 3V' [1H] 1 150774. 072 0. 999 3 p2 ff 4p' [ HI 1 163709. 699 1. 397

2pi 2 150860. 468 1. 301 3pi 0 164287. 864

2p2 ff W [ H] 1 151040. 413 1. 340

2p\ 0 152972. 697 3s5 2p5(2 Pl^)5s 5s [iHr 2 165830. 144 1. 492

3s4 1 165914 756 1. 207

2s6 2pH2 P;*)4s 4s [i nr 2 158603. 070 3s3 2p5

( 2 P£)5s' 5s' [ y2 ]° 0 166608. 309

2s4 1 158797. 954 3s2 1 166658. 484 1. 295

2s3 2p6

( 2 P£) 4s 4s' [ nr 0 159381. 94

2s2 1 159536. 57 4da 2p5(2 Pi*)4d 4d [ y2]° 0 166969. 639

4d5 1 166977. 321 1. 391

3dg 2p»(2 Pi*)3d 3d [ nr 0 161511. 590 4di ff ±d [3 nr 4 167002. 007 1. 251

3c?5 1 161526. 134 1. 397 4d4 3 167003. 104 1. 040

3di

ft 3d [3Hr 4 161592. 308 1. 249 4d3 ff 4d [i nr 2 167013. 535 1. 322

3d4 3 161594. 081 1. 034 4d2 1 167028. 957 0. 812

3d3 ft 3d [i nr 2 161609. 222 1. 356 4d" ft 4d [2nr 2 167049. 580 0. 990

3d2 1 161638. 581 0. 860 4d; 3 167050. 639 1. 248

3d" ft 3d [2

y

2 ]° 2 161701. 623 0. 948 4s'"' 2p5

( 2 P£) 4d 4d' [2y2r 2 167796. 939 0. 783

3d,' 3 161703. 418 1. 249 4s'," 3 167797. 865 1. 116
78

Ne I—Continued Ne I—Continued

Paschen Config. Desig. / Level Obs. g Paschen Config. Desig. / Level Obs. g

4s'i 2pK2 P^)4d 4d' [1H]° 2 167798. 914 1. 230 5y>3 2P4

2 P!h)6p 6 P [ 4] 0 169978. 70

1 167809. 722 0. 797

5p5 2p5

( 2 P^)6p 6 p' [14] 1 170586. 94

5pi 2 170599. 19 4X 2pH2 P^)4/ 4/ [1H] 1, 2 167054. 59

5p2 tt 6p' [ 4] 1 170580. 35

4V tt 4/ [44] 4, 5 [167062. 5] 5pi 0 170691. 32

4Y ft 4/ [24] 2, 3 167071. 08

5s5 2p5

(

2 Pi^) 7s 7s [14]° 2 170534. 694

4Z ft 4/ [34] 3,4 [167079. 1] 5s4 1 170559. 032

4U 2p5

( 2 P£)4/ 4/' [234] 0, 3 167848. 67 5s3 2p42 P^)7s 7s' [ 4]° 0 17181 4. 84

5s2 1 171325. 997 1. 315

4pio 2p42 P^)5p 5p [ 4] 1 167451. 44

6di 2p42 P!H)6d 6d [ 4]° 0 170850. 252

4pfl ft 5p [24] 3 167561. 03 6d5 1 170853. 315 1. 389

4p8 2 167593. 18

6d[ ft 6d [34]° 4 170860. 447

4p?

ft 5p [14] 1 167641. 53 6di 3 170860. 850

4p6 2 167650. 60

6d3 tt 6d [14]° 2 170864. 959 1. 331

4p3 tt 5p [ 4] 0 167869. 17 6d2 1 170869. 927 0. 783

4p6 2pH2 P^)5p 5p' [141 1 168357. 44 6d" ft 6d [ 24]° 2 170874. 840 0. 971

4p4 2 168380. 69 6d[ 3 170875. 216

4p2 // 5p' [ 4] 1 168360. 57 6s"" 2p5

( 2 P£)6d 6d' [24]° 2 171644. 139

4pi 0 168588. 83 US 1 3 17I644. 434

6s" tt 6d' [ 14]° 2 171641. 951

4s6 2p5(2 Pw)6s 6s [ 14]° 2 168926. 626 1. 500 6s[ 1 171646. 87 0. 857

4s4 1 168969. 828 1. 184

4s3 2p5

( 2 P£)6s 6s' [ 4]° 0 169707. 899 6X 2 p4

2 P!k)6/ 6/ [14] 1,2 170877. 72

4s2 1 169729. 602 1. 313

6Y tt 6/ [44] 4,5 170879. 95

5de 2p5(*-PlH)5d 5d [ 4]° 0 169484. 98 6Y tt 6/ [24] 2, 3 170882. 65

5(^5 1 169490. 414 1. 383

6Z ft 6f [341 S, 4 170884. 95

bd'i

ft 5d [34]° 4 169508. 612

5di 3 169504- 258 1. 093 2p42 PA)6/ 6/' [34] 3, 4 171661. 87

6U

5d3 ft 5d [ 14]° 2 169510. 540 1. 298 // 6/' [24] 2, 3 171661. 66

5d2 1 169518. 977 0. 791

6pio 2p42 Pw)7p 7P [ 4] 1 171011. 31 5d" ft 5d [ 24]° 2 169528. 241

5d{ 3 169528. 862 6p0 ft 7P [24] 3 171034. 80

6ps 2 171045. 65

5sr 2p5

( 2 P£)5d 5d' [24]° 2 170291. 291

5s"' 3 170291. 650 6 pi

tt 7p [14] 1 171059. 96

6pa 2 171062. 18

5s" ft 5d' [14]° 2 170290. 984 1. 251

5s; 1 170297. 98 0. 809 6p3 ft 7P [ 4] 0 171150. 81 6p5 2p5

(

2 P^)7p 7p' [14] 1 171824. 2 5X 2P5(2 P!h)5/ 5/ [14] 1, 2 169532. 22 6pi 2 171830. 0 5V ft 5/ [44] 4, 5 [169536. 3] 6p2 ft 7p' [ 4] 1 171832. 7

6pi 0 171915. 46

5Y ft 5/ [24] 2, 3 169540. 88

5Z ft 5/ [34] 3, 4 [169545. 0] 6s5 2p4

2 P!m)8s 8s [ 14]° 2 171475. 295

6s4 1 171491. 464

5U 2p5(2 P£)5/ 5/' [24] 2,3 170319. 71

6s3 2?>42 P^)8s 8s' [ 41° 0 172256. 81

6s2 1 172268. 720

5pio 2p5

( 2 P!^)6p 6p [ 4] 1 169750. 11 5p9 tt 6p [24] 3 169799. 15 7d6 2VK^\y^7d 7^ [ 41° 0 171671. 14

5p* 2 169816. 60 7d5 1 171678. 90

5p7 ft 6p [14] 1 169841. 45 7d\ ft 7d [34]° 4 171677. 455

5p6 2 169845. 79 7di 3 171677. 714
79

Nel—Continued Nel—Continued

Paschen Config. Desig. J Level Obs. g Paschen Config. Desig. J Level Obs. g

7d3 7d2 2pK2?°m)7d 7d [i y2]° 2

1 171683. 331171684- 902 8U 2pH2 PA)8/ J 8f [334]

l 8/' [234]

3, 4 2,3 j> 172996. 63

Id"

7d\

tt 7d [2

y

2]° 2 171687. 268

3 171687. 518 8pio 2p5(2p ?H)9p 9p [ 34] 1 172270. 4

7s"" 2pK2 ?tt7d 7d' [2

y

2]° 2 172460. 407 8p9 tt 9p [234] 3 172284. 2 7s'" 3 172460. 602 8p3 2 172288. 8 7s"

// 7

d'

[i y2]° 2 172459. 85 8p7 ,6 rr 9p [134] 1,2 172293. 4

7s[ 1 172463. 02

8p3 rr 9P [ 34] 0 172329. 3 7X 2p*(}Vlx)7f 7

[134] 1,2 171688. 57 2p5(2p°) 9p 9p' [134] 1 8pi 2 173067. 4 7V tt 7

[434] 4,5 171689. 95

rr 9p' [ 34] 1 7Y ft 7/ [2]4] 2, 3 171692. 07 8pi 0 173099. 3 7Z tt 7/ [334] S, 4 171693. 32

8s5 2P 5(2 P!k)10s 10s [134]° 2 172477. 303

7U 2p5 (2P£)7/ f 7f [334]

l 7/' [2)4] 3,4

2, 3 }

172471. 45 8si 1 172483. 84

8s3 2p5(2 P °)i 0s 10s' [ 34]° 0 173257. 24

8s2 1 173261. 41 7pw 2p5(2 P!«)8p 8p [ 34] 1 171754. 2

7pt

rr 8p [2>4] 3 171789. 0 9de 2p5(2PfH)9d 9d [ 34]° 0 172566. 85

7ps 2 171793. 7 9d5 1 172567. 88

7P7

rr 8p [134] 1 171800. 3 9di tt 9d [334]° 4 172569. 840

7Pi 2 171805. 1 9di 3 172570. 064

7p%

it 8p [ 34] 0 171833. 0 9 d3 tt 9d [134]° 2 172571. 37

9d2 1 172572. 82

2pK2 P£)8p 8p' [134] 1 7Pi 2 172575. 4 9d" 9d [234]° 2 172574- 12

9d[ 3 172574- 22

7pi

tt 8p' [ 34] 1 172564. 8

7pi 0 172601. 7 9s"" 2p5(2P^)9d 9d' [234]° 2 173351. 45

9s'" 3 173351. 50

7s5 2pH2 PW9s 9s [134]° 2 172073. 375 9s" tt 9d' [134]° 2 173351. 49 7Si 1 172082. 895 9s[ 1 173352. 75

7s3 2p5(2 P£)9s 9s' [ 34]° 0 172854. 12

7s2 1 172858. 96 9V 2p5(2 Pl*)9/ 9/ [434] 4,5 172575. 83 9Y It 9/ [234] 2, 3 172576. 8

8d6 2pH2P!«)8d 8d [ 34]° 0 172202. 33

8d5 1 172203. 86 9Z ft 9/ [334] 3, 4 172577. 3

8d\ tt 8d [334]° 4 172207. 110

8di 3 172207. 278 9pio 2p5(2p !K)iop lOp [ 34] 1 172621. 0 8d3 ft 8d [134]° 2 172208. 77 9Pi

r r 10p [234] 3 172625. 2

8d2 1 172211. 10 9ps 2

8d" rr 8d [234]° 2 172213. 094 9p~ji

rr lOp [134] 1,2 172632. 2

8d[ 3 172213. 249

9p3 rr lOp [ 34] 0 172667. 1 8s"" 2pK2 ?*)8d 8d' [234]° 2 172989. 185

8s? 3 172989. 263

9s5 2p5(2 P

cO )lls lls [134]° 2 172761. 79

8s" ft 8d' [134]° 2 172989. 06 9si 1 172766. 55

8s[ 1 172990. 96

9s3 2p5(2p^)H s lls' [ 34]° 0 173542. 00

9s2 1 173545. 28

8X 2p5(2 P^)8/ ^ [134] 1,2 172214. 66

8Y tt 8/ [434] 4,5 172215. 54? 10d6 2p5(2P?M)10d lOd [ 34]° 0 172826. 54

10d5 1 172827. 42

8Y tt 8/ [234] 2,3 [172216. 7] SZ tt 8/ [334] 3,4 172217. 64
80

Ne I—Continued Ne I—Continued

Paschen Config. Desig. j Level Obs. g Paschen Config. Desig. J Level

10dJ 2p5 (

2 PiA)10d lOd [3/2 ]° 4 172829. 11 11s'"' 2p3

( 2 P£)ll d lid' [2y2]° 2 178802. 27

10d4 3 172829. 20 n*r 3 173802. S3

10d3 ff iod [iy2 ]° 2 172829. 87 ff iid' [i y2 ]° 2

10^2 1 172881. 28 ns ; 1 178802. 75

lOd'/ // iod [2 y2 ]° 2 172882. 20

10d{ 3 172882. 24 llss 2p

s( 2 P?h)13s 13s [l/2]° 2 173128. 02

lls4 1 178130. 76

10s'/" 2p3

(

2 P£)10d 10d' [2y2]° 2 178610. 45

liter 3 173610. 52

2p5

( 2 Pfo)12d 12d [ y2 ]° 0

10s" // iod' [i y2]° 2 178610. 50 12d5 1 173165. 56

10si 1 178611. 5

4

12d; ff 12d [3 y2 ]° 4 173166. 46

12d4 3 173166. 43

10p7 ,6 2p3

( 2 PlH)llp 11 v [1/2] 1,2 172873. 9 12d3 ff 12d [i y2 y 2 173167. 03

10s5 2p5

( 2 Pf^) 12s i2S [iy2y 2 172970. 51

10s4 1 172974. s: 12d" ff 12d [2 y2 y 2 173168. 14

12d; 3 173168. 48

lids 2p6

( 2 P!*)lld iid [ y2 ]° 0 173019. 87

lids 1 178019. 86 2p5

( 2 Pf^) 13d 13d [ H]° 0 13d5 1 173279. 46

lld4 ff lid [3 y2]° 4 178020. 86

lld4 3 173020. 82 13d4 ff 13d [3/2]° 4 173280. 05

13d4 3 173280. 12

lld3 n iid [i y2]° 2

1 173022. 02

lid" // lid [2 y2 ]° 2 178022. 95

lldj 3 178028. 27 Ne 11 ( 2 P!h)

Ne 11 ( 2 P£)

Limit 173931.7

Limit 174712. 2

March 1948. Ne i Observed Levels*

Config.

Is 2 2s2 +

Observed Terms

2p« 2p6

1

S

ns (n> 3) np {n> 3)

2p5 (

2 P°)nx /3-13s 3 P°

\3-lls 1 P°

3p

3 S 3p ‘S dp s p

3p‘P

3p 3 D

3p 3 D

j'Z-Coupling Notation

Observed Pairs

ns (n> 3) np (n> 3) nd (n> 3) nf (n>4)

2p5

( 2 Pf^)nx 3- 13s [1 y2]° 3-iop [ y2 ] 3-10p [ 2y2 \ 3-11 p [1/2]

3-13d [ V2 ]° 3-13d [3 y2]° 3-12d [1>4]° 3-1 2d [2/2 ]°

4- 8/[l/2] 6- 9/[4/2 ] 4-7, 9/ [2H1

6- 9/ [3H]

2p5(2p%)nx' 3— 1 1 s ' [ y2]° 3- 9p'[l/2] 3- 9p'[ y2 ] 3-lld'[2*4]°

3-lld'[l^]°

6- 8f'[Sy2 ] 4- 8/'[2H]

*For predicted levels in the spectra of the Ne i isoelectronic sequence, see Introduction.
(F i sequence; 9 electrons) Z=10

Ground state Is2 2s2 2p5 2Pi^

2p

5 2P^ 331350 cm"1 I. P. 41 .07 volts

The terms are from Boyce, who has extended the analysis by further observations in the

ultraviolet, and improved the earlier term values. The series limit is estimated from series of

two members, the 3s and 4s terms.

Intersystem combinations connecting the doublet and quartet terms have been observed.

The values of the 3d' 2 G and 3d' 2S terms have been corrected to agree with the observed

combinations.

REFERENCES

K. T. Compton and J. C. Boyce, J. Franklin Inst. 205, 511 (1928). (T) (C L) (G D)

T. L. de Bruin and C. J. Bakker, Zeit. Phys. 69, 19 (1931). (T) (C L) (Z E)

J. C. Boyce, Phys. Rev. 46, 378 (1934). (I P) (T) (C L)

Ne II Ne II

Config. Desig. J Level Interval Obs. g Config. Desig. J Level Interval Obs. g

2s 2 2p5 2p5 2P° 1/2 0 -782 2s2 2p4

( 3 P)3d 3d 4 D 3/ 279139. 1 -81. 5 -106. 2 -98. 3 Z 782 2/

1/2 279220. 6 279326. 8

2s 2p® 2p6 2 S Z 217050 X 279425. 1

2s2 2p4

(

3 P)3s 3s 4 P 2% 219133. 0 -517. 8 -299. 1

1. 60 2s 2 2p4

( 3 P)3d 3d 4 F 4/2 280174. 4 -528. 1 -325. 6

78. 5

i Z

Z

219650. 8 219949. 9

1. 73

2. 67

3/

2/

280702. 5 281028. 1 1/2 280949. 6

2s 2 2p4

( 3 P)3s 3s 2 P 1/2 224089. 3 -612. 5

1. 33

Z 224701. 8 0. 67 2s2 2p4

(

3 P)3d 3d 2F 3/ 280264. 0 -535. 3

2Z 280799. 3

2s2 2p4

( 3 P)3p 3p 4 P° 2/ £48194- 8 -222. 6 -182. 5

1. 60

1/ 246417. 4 1. 73 2s2 2p4

(

3 P)3d 3d 2 D 2Z 280271. 0 -204. 6 Z 246599. 9 2. 67 1Z 280475. 6

2s2 2p4

(

4 D)3s 3s' 2 D 2/ 246396. 5 -3. 5

1. 20 2s2 2p4

( 3 P)3d 3d 4 P z 280770. 2

221. 5

181. 8 l/2 246400. 0 0. 80 iz 280991. 7 2Z 281173. 5

2s2 2p4 (

3 P)3p 3p 4 D° 3/ 249110. 8 -337. 2 -249. 7 - 144. 1

1. 43

2/ 249448. z

0

1. 37 2s 2 2p4

(

3 P)3d 3d 2 P 281334. 5

387. 8

0. 70 1/ 249697. 7 1. 20 ix 281722. 3 1. 25

Z 249841- 8 0. 00

2s 2 2p4

(

3 P)4s 4s 4 P 2Z 282000. 0 -376. 7 -305. 5

2s 2 2p4

( 3 P)3p 3p 2 D° 2/ 251018. 8 — 511. 4

1. 20 1/2 282376. 7

I /2 251524. 7 0. 80 z 282682. 2

2s 2 2p4

(

3 P)3p 3p 2 S° Z 252800. 8 1. 96 2s 2 2p4

( 3 P)4s 4s 2 P izz

283323. 7 283896. 5 -572. 8

2s 2 2p4

( 3 P)3p 3p 4 S° 1/ 252956. 0

2s 2 2p4

(

3 P)4d 4d 2 D 2/2 302321? -131

2s 2 2p4

(

3 P)3p 3p 2 P° 1/ 254167. 0 -127. 0

1. 33 1/2 302452?

X

2/

254294. 0 0. 71

2s 2 2p4

( 3 P)4/ 4/ 4 D° 3/2 302830. 6 -14 9 -59. 7 -86. 0

2s2 2p4

(

4 D)3p 3p' 2 F° 274366. 9

44. 4

0. 86 2/2 302845. 5

3/ 274411. 3 1. 14 iz 302905. 2 z 802991. 2

2s2 2p4 (tD)3p 3p' 2 P° 1 X 276278. 6 -235. 5

1. 33 z 276514. 1 0. 67

2s2 2p4

(

3 P)4d 4d 2 P / IZ

i z j

302884?

2s2 2p4

(

1 S)3s 3s" 2 S X 276678. 0 2. 00

2s2 2p4

(

4 D)3p 1 X

2s 2 2p4

(

3 P)4/ 4/ 4 F° 4Z 802905. 8 625 0 3p' 2 D° 277327. 6

18. 5

0. 80 3/2 303530. 8 90^ s 2/ 277346. 1 1. 20 2/2 803826. 6

315. 0 iz 803511. 6
82

Ne II—Continued Ne II—Continued

Config. Desig. / Level Interval Obs. g Config. Desig. J Level Interval Obs. g

2s2 2p4 (

3 P)4/ 4/ 4 G° 5Z

4/2 808475. 7 803465. 1 10. 6 -236. 0

98. 8

2s2 2p4

(

4 D)4s 4s' 2 D / 2/2

l 1/2 }

306018?

3/2 2/

803701. 1 303602. 3 2s2 2p4

(

4 D)3d 3d' 2 D 1/4 2/2 306244. 8 306689. 8

445. 0

2s2 2p4

( 3 P)4/ 4/ 2 D° I/2 303465. 4 416. 9 2/ 303882. 3 2s 2 2p4

(

1 D)3d 3d' 2 F 3Z

2/2 307992. 2 308103. 3 -111. 1 2s2 2p4

(

4 D)3d 3d' 2 G 4/ 305366. 2 -1. 0 3/ 305367. 2 2s2 2p4

(

4 D)3d 3d' 2 S Z 309049. 7

2s2 2p4 (

1 S)3p 3p" 2 P° I /2 305899. 2 -10. 1

1. 33 2s2 2p4

(

1 S)3d 3d" 2 D 2Z 327954. 7 -13. 5 /2 805409. 8 0. 67 iz 327968. 2

2s 2 2p4

(

4 D)3d 3d' 2 P 1/z

305568. 9 -15. 3 305584. 2 Ne hi ( 3 P2) Limit 331350

March 1947.

Ne ii Observed Terms*

Config.

ls 2 +

Observed Terms

2s 2 2p

5 2p5 2p°

2s 2p6 2

p

6 2 S

ns (n> 3) np (n> 3)

2s 2 2pi (

3 'P)nx {

3, 4s 4 P

3, 4s 2 P

3p

4 S°

3p

2 S°

3p

4 P°

3p

2 P°

3 p

4 D°

3 p

2 D°

2s 2 2pi

(

1 D)nx' 3, 4s' 2 D 3p' 2 P° 3p' 2 D° 3p' 2F°

2s2 2p4 (

1 S)nz" 3s" 2 S 3p" 2 P°

nd (n> 3) nf (n> 4)

2s 2 2pi

{ 3 Y)nx

{

3d 4 P

3, 4d 2 P

3d

3, 4d

4 D

2 D

3d 4 F

3d 2 F

4/ 4 D°

4/ aD°

4/ 4 F° 4f

4 G°

2s 2 2pi

(

1 D)nxr 3d' 2S 3d' 2 P 3d' 2 D 3d' 2 F 3d' a G

2s 2 2p4

(

1 S)nz" 3d" 2 D

*For predicted terms in the spectra of the F i isoelectronic sequence, see Introduction.
(O i sequence; 8 electrons) Z=10

Ground state Is2 2s2 2_p

4 3 P2

2p4 3 P2 514148 cm-1

I. P. 64 ±1 volts

This spectrum is incompletely analyzed. The terms have been taken from two references:

triplet and quintet terms, de Bruin (1935); and singlet terms, Boyce (1934). The latter are located with respect to the ground state by means of the nebular lines at 3343 A, 3868.74 A, and

3967.51 A. The relative positions of the quintet terms and the ionization potential are estimated,

and the uncertainty, x, may be considerable.

REFERENCES

T. L. de Bruin, Zeit. Phys. 77, 505 (1932). (T) (C L)

V. v. Keussler, Zeit. Phys. 85, 1 (1933). (C L)

J. C. Boyce, Phys. Rev. 46, 378 (1934). (I P) (T) (C L)

T. L. de Bruin, Zeeman Verhandelingen p. 413 (Martinus Nyhoff, The Hague, 1935). (I P) (T)

J. C. Boyce, Mon. Not. Roy. Astr. Soc. 96, 690 (1936). (C L)

Ne ill Ne III

Config. Desig. J Level Interval

! Config. Desig. J Level Interval

2s 2 2p4 2

p

4 3 P 2 0 650 2s2 2p3

( 4 S°)3d 3d 3 D° 1 398192. 70

4. 13

13. 91 10 650

927 -277 23 898196. 88

398210. 74

2s2 2

p

4 2

p

4 4 D 2 25841 2s2 2p3 (4 S°)3d 3d 5 D° 4 898946. 98 +x -1. 53 -3. 83

-3. 41

3 898948. 51 +x

2s 2 2

p

4 2

p

4 4 S 0 55747 2 898952. 84+x

1 898955. 75 +x

2s 2

p

5 2ps sp° 2 20^292 0

1 204879 -325

0 205204 2s2 2p3

(

2 D°)3p 3p' 3 P 2 398986. 64 -95. 93

-42. 55 1 399082. 57

2s 2p5 2ps ip° 1 289479 0 399125. 12

2s2 2p3

(

4 S°)3s 3s 5 S° 2 314148 +x 2s2 2p3

( 2 P°)3p 3p" 3 D 3 409847. 53

2. 45

-10. 15 2 409845. 08

2s 2 2p3 (

4 S°)3s 3s 3 S° 1 819444- 90 1 409855. 23

2s2 2p3

(

4 S°)3p 3p 5 P 1 352662. 05+x 30. 88

52. 98

2s2 2p3

( 2 P°)3p 3p" 3 S 1 410134. 72

2 352692. 93+z

3 352745. 91 +a; 2s 2 2p3

( 2 P°)3p 3p" 3 P 0 412293. 59

19. 52

7. 10

1 412313. 11

2s2 2p3

( 2 D°)3s 3s' 3 D° 3 353148. 00 -29. 16 -20. 24

2 412320. 21

2 353177. 16

1 353197. 40 2s 2 2p3

( 2 D°)3d 3d' 3 F° 2 485527. 90

40. 10

52. 80 3 485568. 00

2s2 2p3

(

4 S°)3p 3p 3 P 2 356776. 52

10. 32 - 10. 32

4 485620. 80

1 356766. 20

0 356776. 52 2s2 2p3

(

2 D°)3d 3d' 3 G° 5 486561. 85 -26. 99

-23. 22 2s2 2p3

( 2 D°)3s 3s' 4 D° 2 857930

4

3 436588. 84

436611. 56

2s 2 2p3

( 2 P°)3s 3s" 3 P° 2 374434- 00

26 75 2s2 2p3

( 2 D°)3d 3d' 3 D° 3 436844. 63 -69. 76

-45. 10

1 374460. 75 -16. 91 2 486914- 39

0 374477. 66 1 436959. 49

2s2 2p3

( 2 P°)3s 3s" !P° 1 379884 2s2 2p3

( 2 D°)3d 3d' 3 P° 2 439586. 00 -121. 81 -52. 54 2s 2 2p3

( 2 D°)3p 3p' 3 D 1 389058. 24

11. 13

69. 68

10

489707. 81 489760. 35

2 389069. 37

3 389139. 05 2s2 2p3

( 2 D°)3d 3d' 3 S° 1 440064. 90

2s2 2p3

(

2 D°)3p 3p' 3 F 2 391414. 02

15. 92

20. 37

3 391429. 94

4 391450. 31 Ne iv ( 4 Sfo) Limit 514148

February 1947.
Ne hi Observed Terms*

Config.

ls2 +

Observed Terms

2s2 2

p

4 W4 is 2p4 3 P

2

p

4 4 D

2s 2p5 { 2

p

5 3 P°

2 p5 ipo

ns (

n

> 3) np ( n> 3)

2s2 2p3

(

4 S°)ra;

/3s 5S°

\3s 3 S°

3 p

5 P

3p

3 P

2s2 2p3

( 2 D°)wx'

{

3s' 3 D°

3s' 1 D°

3p' 3 P 3p' 3 D 3p' 3 F

2s2 2p3

( 2 P°)nz"

{

3s" 3 P°

3s" l Y°

3p" 3 S 3p" 3 P 3p" 3 D

nd (ji > 3)

2s 2 2p3 (*S°)nx

3d 5 D°

3d 3 D°

2s2 2p3

( —2 D°)nx' 3d' 3 S° 3d' 3 P° 3d' 3 D° 3d' 3 F° 3d' 3 G°

*For predicted terms in the spectra of the O I isoelectronic sequence, see Introduction.

Ne IV

(N i sequence; 7 electrons) Z=10

Ground state Is2 2s2 2jp

z 4Si^

2p3 4Si^ 783880 cm-1

I. P. 97.16 volts

The analysis is by Paul and Polster, who have extended the earlier work by Boyce and

published 111 classified lines in the interval from 140 A to 786 A. From series they derive the

limit 781714 cm-1 and place the level 2p3 2D2 at 38540 cm-1 above the ground state zero. No

intersystem combinations have been observed.

On the basis of later analyses of the spectra in this sequence a slight adjustment in these

values has been made by Robinson. The doublet terms have been increased by 2410 cm-1 and the limit by 2166 cm-1 to fit the isoelectronic sequence data. The later values have been

adopted in the table. The uncertainty x, may be considerable.

REFERENCES

F. W. Paul and H. D. Polster, Phys. Rev. 59, 426 (1941). (I P) (T) (C L)

H. A. Robinson, unpublished material (March 1948). (I P) (T)
85

Ne IV Ne IV

Config. Desig. J Level Interval Config. Desig. J Level Interval

2s2 2p% 2ps 4 S° IK 0 2s 2 2p2 <+D)3d 3d' 2 S K 616482+2;

2s2 2p3 2p3 2D° 2K 40950 +x -25 2s 2 2p2 ( 3 P)4s 4s 4 P K 633465

325

623

IKK

40975 +x IK2K

633790

634413

2s 2 2pz 2p3 2p° 62157+x

62167+x 102s2 2p2 ( 3 P)4s 4s 2 P 635866+2;

636475+2; 609

IK

2K K

IK

2s 2p4 2p4 4 P 183860 617

IK 184477 -322 2s 2 2p2 ( 3 P)4p 4p 4 D° K 641908 276

288

462 K 184799 IK 642184

2K

2K 642472

2s 2p4 2p4 2 D 253807+2; -16 3K 642934

IK 253823+2: 2 S K

2s 2 2p2 ( 3 P)4p 4p 4 po K 643239 433

303

2s 2

p* 2pi 299351 +2 IK 643672

IK

2K 643975

2s 2p4 2p4 2 P 319751+2; -701 K 320452+x 2s2 2p2 (3 P)4p 4p 4 S° IK 648060

2s 2 2p2 ( 3 P)3s 3s 4 P K

IK

2K

478701

479079

479651

378

572

2s 2 2p2 ( 1 D)4s 4s' 2 D / 2K l IK j

664124+2;

2s2 2p2 ( 3 P) 4d 4d 2 p 2K 670595+2; 657 2p5 2p5 2p° IK 484623 +x -962 3K 671252+2: KK

485585 +x

2s 2 2p2 (3 P) 4d 4d 4 P 2K 671402 -700

-574 2s 2 2p2 ( 3 P)3s 3s 2 P 488215+2; 702 IK 672102

IK 488917+2 K 672676

2s 2 2p2 ( 1 D)3s 3s' 2 D f 2K t IK j511411+x

2s 2p3 ( 5S°)3d 3d'" 4 D° [ Kto 672799 K l 3 K I 2s2 2p2 ( 3 P)3p 3p 4 p° 524391 %g5 IK 524676 341 2s 2 2p2 ( 3 P) 4d 4d 2 D IK 673427+2; 160 2K 525017 2K 673587+2;

2s2 2p2 ( 3 P)3p 3p 4 S° IK 532978 2s 2 2p2 ( 3 P) 5s 5s 4 P K 693106 611 K

IK 693717 636

2s2 2p2 ( 1S)3s 3s" 2 S 551712+2 2K 694353

2s2 2p2 ( 3 P)3d 3d 2 P iKK

575968+2

576353+2 -385 2s2 2p2 ( 1 D)4d 4d' 2p r 2K l 3K }

697855+2;

2s2 2p2 ( 1 S)3d 3d" 2 D f IK l 2K }

576915+2 2s 2 2p2 (+D)4d 4d' 2 D f IK 1 2K }

699622+2:

2s 2 2p2 ( 3 P)3d 3d 4 P 2K

IK

579307

579626 -319 — 111

2s 2 2p2 ( 1 D)4d 4d' 2 P /l IK }

701223+2; K 579737

2s 2 2p2 (3 P)3d 3d 2 p 2K 579375+2 720

2s2 2p2 ( 4S)4d 4d" 2 D / iK l 2K |

709460+2;

3K 580095+2

2s 2 2p2 ( 1 D)5s 5s' 2 D / IK l 2/2 }724690+2;

2s 2 2p2 ( 3 P)3d 3d 2 D IK 586685+2 233

2K 586918+2

2s 2 2p2 ( 1 D)5d 5d' 2 p f 2/ l 3K |

740607+2;

2s 2p3 ( 5S°)3s 3s'" 4 S° IK f 2K l 3K

588021

2s2 2p2 ( 1 D)6s 6s' 2 D \ 754597+2; f IK l 2/ 2s 2 2p2 ( 4D)3d 3d' 2 p }

605417+2 J

2s 2 2p2 ( 4 D)3d 3d' 2 D / IK l 2KK }609118+2 Ne

v ( 3 P0) Limit 783880

2s 2 2p2 ( 4D)3d 3d' 2 p 612668+2 113 IK 612781+2

March 1948.
86

Ne iy Observed Terms*

Config.

ls2 +

Observed Terms

2s 2 2p

3

2s 2

p

4

2p6

J2p3 4 S°

\ 2p3 2 P° 2p

3 2 D°

/

2p

i 4 P

12 pi 2 S 2p4 2 P 2p* 2 D

2p5 2po

ns (n> 3) np (n> 3) nd ( n> 3)

2s2 2p2

(

3 P)nx / 3-5s 4 P 3, 4p 4 S° 3, 4p

4 P° 4p 4 D° 3, 4d 4 P

1 3, 4s 2 P 3d 2 P 3, 4d 2 D 3, 4d 2 F

2s2 2p2

(

1 D)nx' 3-6s' 2 D 3d' 2 S 3, 4d' 2 P 3, 4d' 2 D 3-5d' 2 F

2

s

2 2p2

(

1 S)nx" 3s" 2 S 3, 4d" 2 D

2s 2p3

( 5S°)nx'" 3s'" 4 S° 3d'" 4 D°

*For predicted terms in the spectra of the N i isoelectronic sequence, see Introduction.

Ne v

(C i sequence; 6 electrons) Z=10

Ground state Is2 2s2 2p

2 3 P0

2p2 3P0 1019950 cm-1

I. P. 126.4 volts

Paul and Polster have classified a total of 56 lines of Ne v in the range 118 A to 572 A, as transitions among 47 energy levels. The absolute value of 2p

2 3P0 is calculated from the

nd 3 P° and nd 3 D° series, in each of which two members have been observed.

The singlet and triplet terms are connected by the intersystem lines 2p2 3P2 ,i —

2

p

2 J D2 observed in the spectra of gaseous nebula, as given by Bowen.

No intersystem combinations connecting the quintet terms with the rest have been observed,

as indicated by the uncertainty x in the table. Paul and Polster estimate from isoelectronic

sequence data that the term 2p3 5 S2 is 86700 ±300 cm-1 above the ground state. From later

data on this sequence Robinson places the value at 88842 cm-1. The later value is entered in

brackets and has been used in the present compilation for all quintet terms.

REFERENCES

I. S. Bowen, Rev. Mod. Phys. 8, 68 (1936). (C L)

F. W. Paul and H. D. Polster, Phys. Rev. 59, 428 (1941). (I P) (T) (C L)

H. A. Robinson, unpublished material (March 1948). (T)
87

Ne V Ne V

Config. Desig. J Level Interval Config. Desig. J Level Interval

2s2 2p2 2p2 3 P 0 0 414 2s 2 2p(2 P°)3d 3d 3 D° 1 698231

151 353

12 414

1112 698 2

3 698382

698735

2s2 2p2 2p2 *D 2 30294 2s2 2p(2 P°)3d 3d 3 P° 2 701765 -309

-385

2

p

2 iS

1 702074

2s2 2p2 0 63900 0 702459

2s 2p3 2p

3 3 S° 2 [88842]+x 2s 2 2p(2 P°)3d 3d ip° 1 702412

2s 2p3 2

p

3 3 D° 3 175834 -71

-22

2s 2 2p(2 P°)3d 3d !F° 3 709956

2 175905

1 175927 2s 2p2

(

4 P)3s 3s 3 P 0 719350 177 484 1 719527

2s 2p3 2p

3 3po 2,1 208157 -36 2 720011

0 208193

2s 2 2p(2 P°)4s 4s 3 P° 0, 1,2 795279

2s 2p3 2p3 'D° 2 270564

2s 2p2

(

4 P)3d 3d 3 P 3 799115+2 -171

-207 2s 2p3 2p3 3 S° 1 279365 2 799286+x

1 799493+2

2s 2p3 2p

3 ip° 1 303812

2s 2 2p(2 P°)4s 4s iP01 805284

2p

i 2p4 3 P 2 412681 -785

-337 1 413466 2s 2p2

( 4 P)4s 4s 5 P 1, 2,3 822976+2

0 413803

2s2 2p(2 P°)4d 4d 1 D° 2 838623

2s 2 2p(2 P°)3s 3s 3 P° 0 596230 396

866 1 596626 2s2 2p(2 P°)4

d

4d 3 D° 1, 2,3 842020

2 597492

2s2 2p(2 P°)4d 4d 3 P° 2, 1,0 842914

2s 2 2p(2 P°)3s 3s !P 0 1 605231

2s2 2p(2P°)4d 4d 3 F° 3 8472077

2s 2 2p(2 P°)3d 3d >D° 2 690691

4d 2s 2p2

(

4P)4d 5 P 3, 2,1 865282+2

2s 2p2

( 4 P)3s 3s 5 P 1 697507+2 552

453 2 698059+2

3 698512+2

Ne vi (

2 p£) Limit 1019950

March 1948.

Nev Observed Terms*

Config.

ls 2 +

Observed Terms

2s2 2p2 {2p2 is 2p2 3p

2p

2 !D

2s 2p3 f2p3 3S°

2p

3 3 S° 2p3 3 P°

2p

3 1 P°

2p3 3 D°

2p3 !D°

2p4 2p4 3 P

ns (n> 3) nd (n> 3)

2s2 2p(2 P°)nx

{

3,4s 3 P°

3,4s ip°

3, 4d 3 P°

3d J P°

3, 4d 3 D°

3, 4d 4 D° 3, 4d iF°

2s 2p2

( 4 P)n2

{

3,4s 5 P

3s 3 P

3, 4d 5 P

*For predicted terms in the spectra of the Ci isoelectronic sequence, see Introduction.
88

Ne vi

(B i sequence; 5 electrons)

Ground state Is2 2s2 2p

2P^

2p

2P;, 1274000 ±1000 cm"1

Z=10

I. P. 157.91 ±0.12 volts

This spectrum is incompletely analyzed. Paul and Polster have classified 23 lines in the

range from 110 A to 562 A. They have estimated the limit and ionization potential from

isoelectronic data. No intersystem combinations have been observed but the uncertainty x is approximately known from their estimated value of 2p

2 4P (entered in brackets in the table)

.

REFERENCE

F. W. Paul and H. D. Polster, Phys. Rev. 59, 429 (1941). (I P) (T) (C L)

Ne VI Ne VI

Config. Desig. J Level Interval Config. Desig. J Level Interval

2s2

(

1 S)2p 2 p2 P° Vi 0

1316 f X | 1/2 1816 2s 2p(3 P°)3s 3s 4 P° ( to 884113+x

L 2/ J

( X ] 2s 2p2 2

p

2 4 P ( to

l 2/2 [99300] +z 2s 2p(3 P°)3p 3v

2 P / X

i 1/2 }

878852

2s 2p

2 2

p

2 2 D 2/ 178998 -22 2s 2p(3 P°)3p 3 p

2 S X 900408

1 / 179020

f IX

2s 2p l 2 /

2 2

p

2 2 S X 232587 2s 2p( 3 P°)3p 3p

2 D

}

906373

2s 2

p

2 2j92 2 p K 249292 820 f X 1 I/2 250112 2s 2p( 3 P°)3d 3d 4 D° to 924791

[ 3/2 J 2s 2 (

1 S)3s 3s 2 S X 722610

2s2

(

1 S)3p 3 p2 P° X

1/2

|

1/2

l 2/

763096

768385 289 Ne vii 0S0) Limit 1274000

2s2

(

4 S)3d 3d 2 D

}

816405

October 1946
89

SODIUM

Nal

11 electrons Z=ll

Ground state Is2 2s2 2_p

6 3s 2Si^

3s 2Si^ 41449.65 cm-1I. P. 5.138 volts

Thackeray has observed the 2P° series in absorption to n= 73. His values are used for

this series for n=4.to 59,* and for the 2D series for n—S to 13. Meissner and Luft have observed selected lines with an interferometer. Their results,

including observed intervals of the 3-6d

2D terms (the four-place entries in the table) and

improved absolute values of the 3-7s

2S, 3p

2P° and 3-7d

2D terms, have been used.

From infrared observations Rood and Sawyer have extended the nj 2Y° series from n=

5

to n— 11, except for n—8. Their values have been used, a calculated value of 8/ 2F° being

entered in brackets in the table.

The rest of the terms are from Fowler and Paschen-Gotze, who published detailed analyses.

By analogy with other spectra the designations 5g 2 G and 6h

2H° have been assigned to the

terms calculated from Fowler’s combinations labeled “ 30-40” and “4</>-5$”, respectively.

REFERENCES

A. Fowler, Report on Series in Line Spectra p. 99 (Fleetway Press, London, 1922). (I P) (T) (C L)

F. Paschen und R. Gotze, Seriengesetze der Linienspektren p. 56 (Springer, Berlin, 1922). (I P) (T) (C L)

W. F. Meggers, Bur. Std. J. Research 10, 673, RP558 (1933). (C L) H. E. "White, Introduction to Atomic Spectra p. 77 (McGraw-Hill Book Co., Inc., New York, 1934). (G D)

W. F. Meggers, J. Research Nat. Bur. Std. 14, 487, RP781 (1935). (C L) K. W. Meissner und K. F. Luft, Ann. der Phys. [5] 29, 698 (1937). (I P) (T) (C L)

P. Rood and R. A. Sawyer, Astroph. J. 87, 70 (1938). (T) (C L)

W. F. Meggers, J. Opt. Soc. Am. 36, 431 (1946). (Summary hfs) E. R. Thackeray, Phys. Rev. (1949). (In press). (I P) (T) (C L)

Nal Nal

Config. Desig. J Level Interval Config. Desig. J Level Interval

3s 3s 2 S Vi 0. 000 op 5p 2 P° y 35040. 27

2. 52

1/2 35042. 79

3P 3p

2 P° X 16956. 183

17. 1963 16973. 379 6s 6s 2 S y2 36372. 647

4s 4s 2 S X 25739. 86 5d 5d

2 D 2y

i/2 37036. 781

37036. 805 -0. 0230

3d 3d 2 D 2%

1 X

29172. 855

29172. 904

-0. 0494

5/ 5/ 2F° f 2/2 l 3/ } 37057. 6

4p 4p 2 P° x 30266. 88

5. 63

i X 30272. 51

5g 5g 2 G J 3/

i 4/ } 37060. 2

5s 5s 2 S x 33200. 696

4d

6p 6p 2 P° X 37296. 51

1. 25 4d 2 D 21A

1/2 34548. 754

34548. 789

-0. 0346 1/2 37297. 76

7s 7s 2 S X 38012. 074

4/ 4/ 2 F° J 2y2 l 3/ | 34588. 6

6d 6d

2 D 2/ 38387. 287 =0. 0124

1 X 38387. 300

•The last 14 members are not included because page proof had been prepared when the data were received.
90

Na I—Continued Na I—Continued

Config. Desig. J Level Interval Config. Desig. J Level Interval

6/ 6/ 2 F° J 2^ 1 SS400. 1 1 l 0/2 ) 14p 14p 2 P° J /2 l IK }

4081 4. 47 6h 6/i 2 H° r 4 K l 5y2 | 38408. 4 14d 14d 2 D / 2K \ IK } 40890. 0 7P 7p 2 P° k 38540. 40 0. 74 1 K 38541 14 15p 15p 2 P° / K l IK } 40901. 11 85 8s 2 S K 38968. 35 7d 7d 2 D 2/2 39200. 962 -0. 001

15d 15d 2 D J 2K 1 IK }

40958

IK / 2K l 3K

39200. 963 1 16p 16p 2 P° ) 40971. 16 j K l IK 7/ 7/ 2 F° } 39209. 2 8P 8p 2 P° K 39298. 54 0. 47

17p 17p 2 P° / K l IK } 41028. 68

IK 89299. 01

9s 9s 2 S K 39574. 51 18p 18p 2 P° / K l IK j- 41076. 37 8d 8d 2 D f 2K t IK } 39729. 00 19p 19p 2 P° / K l IK } 41 H6. 28

8/ 8/ 2 F° f 2K l 3K |

[39784. 0]

20p 20p 2 P° / K 1 IK } 41150. 39 9p 9p 2 P° K

IK

39794. 53

89795. 00

0. 47 21p 21p 2 P° 1 H l IK }

41179.22

10s 10s 2 S K 39983. 0 22p 22p 2 P° / K l IK } 41204. 28 9d 9d 2 D / 2K 1 11/ 1 40090. 57 / K l IK L J-72 J 23p 23p 2 P° } 41225. 88

9/ 9/ 2 F° J 2K l 3K ) 40093. 2 J 24p 24p 2 P° j 72 l IK }

4124177

lOp lOp 2 P° / K l IK } 40137. 23

25p 25p 2 P° 1 K l IK } 41261. 42

11s 11s 2 S K / 2K l IK

40273. 5 26p 26p 2 P° } 41276. 11 / K l IK lOd lOd 2 D | 40349. 17 1 27p 27p 2 P° J} 41289. 16 J 2K l 3K / K l IK 10/ 10/ 2 F° | 40350. 9 1 / K l IK 1 28p 28p 2 P° / K } 41300. 74 lip lip 2 P° | 40383. 16 l 1 /2 J

12s 12s 2 S K 40482. 9 29p 29p 2 P° / K 1 IK | 41311. 09

11/ 11/ 2 F° co

to

toXtoX |

40589 30p 30p 2 P° / K 1 IK | 41320. 84

11 d lid 2 D J 2K l IK | 40540. 35 31p 31p 2 P° / K 1 IK } 41328. 87

12 p 12p 2 P° / K l IK | 40566. 08 32p 32p 2 P° 18 } 41336. 50

13s 13s 2 S K 40644. 6 33p 33p 2 P° 18 } 41 843. 49

12c? 12d 2 D / 2K 1 IK } 40685. 8 34p 34p 2 P° .8 } 41349. 70

13p 13p 2 P° { IK | 40705. 68

35p 35p 2 P° 18 \ 41355. 50

14s

13d

14s 2 S

13d 2 D K J 2K \ IK

40769. 5 36p 36p 2 P° ) 41360. 82 j K 1 IK | 40798. 8
91

Nal—Continued Nal—Continued

Config. Desig. J Level Interval Config. Desig. J Level Interval

37p 37p 2 P° I %

\ 1 X J 41365. 66 49p 49p 2 P° { X

l 1/2 | 41402. 25

38v 38p 2 P° I X

\ IX | 41370. 11 50p 50p 2 P° / H

1 1/2 } 41404- 18

39p 39p 2 P° ( X

i 1 X j 41374. 27 51p 51p 2 P° / H

1 1/2 j 41406. 03

40p 40p 2 P° f X

i 1 X | 41378. 04 52p 52p

2 P° ( %

l 1 X | 41407. 69

41p 41p 2 P° I x

\ ix } 41381. 55 53p 53p 2 P° 1 Xt 1/2 } 41409. SO

42p 42p 2 P° f ^2 i 1 X } 41 384- 84 54p 54p 2 P° VC'IVC'J rNrfS T—i } 41410. 81

43p 43p 2 P° / X,

l IX | 41387. 91 55p 55p 2 P° / X

\ IX | 41412. 20

44p 44p 2 P° { X

\ ix | 41390. 73 56p 56p 2 P° / X

\ 1/2 } 414IS. 59

45p 45p

2 P° {

l i X | 41393. 34 57p 57p

2 P° r x

1 1/2 } 41414. 89

46p 46p 2 P° { X

X ix | 41395. 77 58p 58p

2 P° f X

X 1/2 } 414I6. 06

47p 4:7P

2 P°

48p

2 P°

I X

l

1 X

f X

X IX

} 41398. 10 59p 59 p

2 P° / X

l 1 X } 41417. 18

48p ^ 41400. 28

Na 11 OSo) Limit 41449.65

January 1949. Na II

(Ne i sequence; 10 electrons) Z=ll

Ground state Is2 2s2 2p6S0

2p* % 381528 cm-1 I. P. 47.29 volts

The analysis has been taken from Soderqvist’s Monograph except for the 5s- and 6s-levels,

which are quoted from Vance’s paper.

The term designations assigned by Soderqvist on the assumption of -LS-coupling are listed

under the heading “Author,” with corresponding assignments added for the 5s- and 6s-levels. As for Ne i, the jZ-coupling notation in the general form suggested by Racah is adopted.

Shortley has, however, pointed out that the configurations 2p

5 3s, 2p5 3p, and 2p

b 3d are much

closer to -LS-coupling than they are to j7-coupling.

REFERENCES

I. S. Bowen, Phys. Rev. 31 , 967 (1928). (T) (C L)

S. Frisch, Zeit. Phys. 70, 498 (1931). (T) (C L) B. B. Vance, Phys. Rev. 41, 480 (1932). (T) (C L)

J. Soderqvist, Nova Acta Reg. Soc. Sci. Uppsala [IV] 9, No. 7, 22 (1934). (I P) (T) (C L) (G D)

G. Racah, Phys. Rev. 61, 537 (L) (1942). G. Shortley, unpublished material (1948).
92

Nail Nan

Author Config. Desig. J Level Author Config. Desig. J Level

2p

iS0 2 p

8 2p« iS 0 0. 00 3d !Pi 2p5

(

2 P°h) 3d 3d [ 154]

0

1 331748. 77 3d ! D2 2p5

(

2 P^)3d 3d' [2 y2y 2 332806. 06

3s5 3 P2 2p3

( 2 Pf*)3s 3s [1H1° 2 264928. 00 3 d3 3 332845. 80

3s4 3 Pl 1 265693. 29

3d 3 D2 n 3d' [1^]° 2 332966. 42

3s3

3 P0 2p5

(

2 PA)3s 3s' [ /2]° 0 266285. 36 3 D4 1 333166. 70

3s2

j P! 1 268766. 67

4s5

3 P2 2p5

( 2 P°m) 4s 4s [ 154]

0 2 331500. 29

3pio 3 Si 2p5

( 2 Pi^)3p 3p [ HI 1 293224. 12 4s4

3 Pl 1 331877. 67

3 Pq

3 D3 // 3p [2541 3 297252. 52 4s3

3 P0 2p5

( 2 P^)4s 4s' [ Kl° 0 332713. 96

3pg 3 D2 2 297639. 34 4s2 !Pi 1 333111. 60

3pi 3 DX n

3p [154] 1 298169. 14

3p« ^D2 2 299193. 75 2pH2 P;h)5s 5s [l/2]° 2

5s4

3 Pi 1 353260

3p3 3 P0 n

3p [ /2 ] 0 300391. 59

2p5

( 2 P£)5s 5s' [ /2]° 0 3p5 *Pi 2p5

( 2 P£)3p 3p' [l/2] 1 299889. 16 5s2

! Pi 1 354850

3p4 3 P2 2 300107. 71 3p2 3 Pi // 3p' [ K] 1 300510. 92 4d iPi 2p5

( 2 P^)4d 4d [1541° 1 353573

3pi »So 0 308864. 54

2p5

( 2 P?h)6s 6s [ 154]

0 2

CO A. © 2p5

( 2 Pfo)3d 3d [ y2]° 0 330553. 18 6s4

3 Pj 1 363500

3 Pl 1 330640. 60

2p5

( 2 P£)6s 6s' [ 54]° 0

3d 3 P2 // 3d [154]° 2 330792. 85 6s2

j Pi 1 364960

3d 3 F4 // 3d [354]° 4 331126. 76

3 f3 3 331190. 49

3d 3 F2 // 3d [234]° 2 331669. 40 Na hi (

2 P?h) Limit 381528

»f3 3 331711. 75

Na hi (

2 P£) Limit 382892

August 1947. Na ii Observed Levels*

Config.

Is2 2s2 +

Observed Terms

2p6 2p 6 »S

ns (n> 3) np (n> 3) nd (n> 3)

2p5

( 2 P°)nz f 3-6s 3 P°

\ 3-6s »P° 3p 3 S 3p 3 P 3p 3 D

3p iS 3p !P 3p

3d 3 P° 3d 3 D° 3d 3 F°

3, 4d »P° 3d !D° 3d iF°

jZ-Coupling Notation

Observed Pairs

ns (n> 3) np (n> 3) nd (n> 3)

2p5

( 2 P^)ruc 3-6s [134]° 3P [ 3p [ 234 ] 3p [154]

3d [ HI

0 3d [334]° 3, 4d [1 y2 ]° 3d [234]° 2p»(2 P&)n*' 3-6s' [ 34]° 3p' [134] 3p' [ tf] 3d' [234]° 3d' [1 y2 ]°

*For predicted levels in the spectra of the Ne i isoelectronic sequence, see Introduction.
(F i sequence; 9 electrons) Z=ll

Ground state is Is2 2s2 2p

5 2Pi^

2p5 2F°m 578033 cm-1

I. P. 71.65 volts

The terms are taken from the paper by Tomboulian, who has revised and extended the

analysis by Soderqvist, but adopts the limit estimated by Soderqvist. The 2P° term from the

X S limit in Na iv has not been located to confirm Soderqvist’s 2S and 2D terms from this limit.

Intersystem combinations have been observed, connecting the doublet and quartet terms.

REFERENCES

J. Soderqvist, Nova Acta Reg. Soc. Sci. Uppsala [IV] 9, No. 7, 39 (1934). (T) (C L) (G D)

D. H. Tomboulian, Phys. Rev. 54, 347 (1938). (I P) (T) (C L)

Na ill Nam

Config. Desig. J Level Interval

2s 2 2p5 2p

5 2po

1 X

X

0

1864

-1364

2s 2

p

9 2p« 2 S Y2 264449

2s2 2p4

(

3 P)3s 3s 4 P 2X

1/2V2

366165. 3 367052. 3 367561. 9 -887. 0 -509. 6

2s2 2p4

( 3 P)3s 3s 2 P 1 X

X

373633. 0 374681. 4 -1048. 4

2s2 2p4 (

4 D)3s 3s' 2 D 2y2 1 X

399179. 4

399182. 7 -3. 3

2s 2 2p4

( 3 P)3p 3P

4 po 2x

1/2

Y2

406200. 9 406562. 0

406876. 0

-361. 1 -314. 0

2s2 2p4

(

3 P)3p 3P

4 D° 3x

2X

1/2X

410987. 9 411548. 2

411963. 9

412201. 5

-560. 3 -415. 7 -237. 6

2s2 2p4

( 3 P)3p 3P

2 D° 2X

1/2 414281. 0

415178. 2 -892. 2

2s2 2p4

( 3 P)3p 3p 2 S° X 416910. 2

Config. Desig. J Level Interval

2s2 2p4

(

3 P)3p 3 P4 S° 1 X 417415. 5

2s2 2p4 (

3 P)3p 3p 2p° ix 41 841 8. 1 - 138. 8 y2 418556. 9

2s2 2p4 0S)3s 3s" 2 S X 435031

2s2 2p4 (*D)3p 3p' 2p° 2% 440478. 0

80. 4

3H 440552. 4

2s 2 2p4

(

4 D)3p 3 p' 2p° 1/2 442710. 5 -551. 1 448261. 6

2s2 2p4

(

4 D)3p 3p' 2 D° IX 444748. 1 76. 9 2y2 444825. 0

2s2 2p4

( 3 P)3d 3d 4 D 3y2 460267. 8 -153. 2 - 184. 6 -153. 7

2y2 1 x

y2

460421. 0

460605. 6 460759. 3

2s2 2p4

( 3 P)3d 3d 4 F 4/2 461877. 4? -1235. 4 -515. 3

165. 9

3x

2X

463112. 8 463628. 1 IX 463462. 2

2s2 2p4 (

3 P)3d 3d 4 P X 462391. 2

572. 4

293. 8

1 X 462963. 6 2y 463257. 4
94

Na ill—Continued Na in—Continued

Config. Desig. J Level Interval Config. Desig. J Level Interval

2s 2 2p4

( 3 P)3d 3d 2JP 3/2 2K

463968. 8 465768. 8 -1800. 0

2s 2 2p4

(

x D)3d 3d' 2 S K 497751. 2

2s 2 2p4

(

x D)4s 4s' 2 D 2/2 511410

2s2 2p4

(

3 P) 3d 3d 2 D 2/2 IK

464392. 1 465027. 9 -635. 8 IK

2s 2 2p4

( 3 P)4d 4d 2 D 2K 514652

2s2 2p4 (

3 P)3

d

3d 2 P K

1/2 465988. 0 466773. 0

785. 0

4d 2 P

IK

K 515023 356

2s2 2p4

( 3 P)4d

2s2 2p4

( 3 P)4s 4s 4 P 2/2 467773. 8 -754. 7 -421. 0 IK 515379

IK

K

468528. 5 468949. 5 2s2 2p4 (

x S)3d 3d" 2 D 2/2 IK

529465

529498 -33

2s2 2p4

( 3 P) 4s 4s 2 P IK 471446. 6 -804. 0

K 472250. 6

2s 2 2p4

(

x D)4d 4d' 2 P / K

\ IK }

544227

2s 2 2p4

(

x D)3d 3d' 2 G 4K

3^2 491928. 2 2s 2 2p4 (

x D)4d 4d' 2 D IK

2K 544736

2s2 2p4

(

x D)3d 3d' 2 p K

lK

IK

2K

493191. 3 493289. 3

98. 0

2s2 2p4

(

x D)3d 3d' 2 D 493853. 2

745. 8 Na iv (

3 P2 ) Limit 578033

494599. 0

2s2 2p4

(

x D)3d 3d' 2 F 3K 495446. 8 -221. 8 2K 495668. 6

March 1947. Na hi Observed Terms*

Config.

ls 2 +

Observed Terms

2s2 2p

h

2s 2p6

2s2 2p4

( 3 P)nx

2s2 2p4

(

x D)nx'

2s 2 2p4 (

1 S)na;"

2p

s 2po

2

p

6 2 S

ns ( n> 3) np (n> 3) nd (n> 3)

/ 3, 4s 4 P

l 3, 4s 2 P

3, 4s' 2 D

3s" 2 S

3p 4 S° 3 p

4 P° 3p4 D°

3p 2 S° 3p

2 P° 3p

2 D°

3p' 2 P° 3p' 2 D° 3p' 2F°

3d 4 P 3d 4 D 3d 4 F

3, 4d 2 P 3, 4d 2 D 3d 2 F

3d' 2 S 3, 4d' 2 P 3, 4d' 2 D 3d' 2F 3d' 2 G

3d" 2 D

*For predicted terms in the spectra of the F i isoelectronic sequence, see Introduction.
Na IV

Z=ll

95

(O i sequence ; 8 electrons)

Ground state Is2 2s2 2_p

4 3P2 2^4 3 P2 797741 cm 1 I. P. 98.88 volts

The terms are from Soderqvist who has extended Vance’s early work on this spectrum. In

the 1946 reference Soderqvist states that the absolute values of the singlets as published in his

Monograph should be decreased by 1000 cm-1. This correction has been applied in the present

list. The analysis is incomplete but 74 lines have been classified in the range 129 A to 412 A,

and 40 terms found. No intersystem combinations have been observed and the uncertainty,

x, may be considerable. The term 3d'" 3D has been calculated from its combination with

2p5 3 P° and added to the published list. REFERENCES

J. Soderqvist, Nova Acta Reg. Soc. Sci. Uppsala [IV] 9, No. 7, 51 (1934). (I P) (T) (C L) (G D)

J. Soderqvist, Ark. Mat. Astr. Fys. (Stockholm) 32A, No. 19 p. 4 (1946). (C L)

Na IV Na IV

Config. Desig. J Level Interval Config. Desig. J Level Interval

2s2 2

p

4 2

p

4 3 P 2

10

0 1106

1576

-1106

-470

2s2 2p3

(

2 P°)3d

2s 2 2p3

(

2 P°)3d

3d" 3 P°

3d" >D°

2, 1, 0 2

663592

664904 +x

2s2 2p4 2p4 4 D 2 31118+® 2s 2 2p3

(

2 P°)3d 3d" 3 D° 3, 2, 1 665362

2s2 2

p

4 2p4 4 S 0 66780+x 2s2 2p3

(

2 P°)3d 3d" 4 P° 1 665640 +x

2s 2p5 2p5 3 P° 2 2^3682 -1006

-550

2s2 2p3

(

2 P°)3d 3d" !F0 3 667696 +x

1 244688

0 245238 2s2 2p3

(

4 S°)4d 4d 3 D° 3, 2, 1 684649

2s 2p5 2ps ip° 1 343972 +

2s 2 2p3

(

2 D°)4s 4s' 3 D° 3, 2, 1 689755

2s2 2p3

(

4 S°)3s 3s 3 S° 1 486648 2s2 2p3

( 2 D°)4s 4s' 1 D° 2 692043 +

2s 2 2p3

(

2 D°)3s 3s' 3 D° 3 525100 -19

-17

2s 2 2p3 (

2 P°)4s 4s" 3 P° 2, 1, 0 714937

2 525119

1 525136 2s 2 2p3

(

2 P°)4s 4s" 4 P° 1 716773+x

2s2 2p3

( 2D°)3s 3s' >D° 2 531696 +x 2s2 2p3

( 2 D°)4d 4d' 3 D° 3, 2, 1 730712

2s2 2p3

(

2 P°)3s 3s" 3 P° 2, 1, 0 550176 2s2 2p3

( 2 D°)4d 4d' J P° 1 731948 +x

2s2 2p3

( 2 P°)3s 3s" 4 P

0

1 557081 +® 2s2 2p3

( 2 D°)4d 4d' 3 P° 2, 1, 0 732355

2s 2 2p3

(

4 S°)3d 3d 3 D° 1 594893 C 2s2 2p3

( 2D°)4d 4d' 3 S° 1 732940

2 594898 43

3 594941 2s 2 2p3 (

2 D°)4d 4d' 4 D° 2 733548 +x

2s2 2p3

( 2 D°)3d 3d' 3 D° 3 638831 -111

-35

2s2 2p3

( 2 D°)4d 4d' 4 F° 3 734195+x

2 638942

1 638977 2s2 2p3

( 2 D°)5s 5s' 3 D° 3, 2, 1 753352

2s2 2p3

( 2 D°)3d 3d' ip° 1 641468+x 2s 2 2p3

( 2 P°)4d 4d" ‘D° 2 756045 +x

2s 2 2p3

( 2 D°)3d 3d' 3 P° 2 6-43029 -275

(-92)

2s2 2p3

( 2 P°)4d 4d" 3 D° 3, 2, 1 756367

1 643304

0 {643396) 2s 2 2p3

(

2 P°)4d 4d" 1 F° 3 757261 +x

2s2 2p3

(

2 D°)3d 3d' ] D° 2 648912+x 2s2 2p3

(

2 D°)5d 5

d' 3 D° 3, 2, 1 772415

2s2 2p3

( 2 D°)3d

2s2 2p3

(

4 S°)4s

2s2 2p3 (

2 D°)3d

3d' 3 S° 1 644140

644792

646711+x

4s 3 S° 1 Na v (4 Sfo)

2s 2p4

(

4 P)3d

Limit 797741

3d' 4 F° 3 3d'" 3 D 3, 2, 1 813538

February 1947.
Na iv Observed Terms*

Config.

1 s

2 +

Observed Terms

2s 2 2

p

4

2s 2p5

/ 2p4 3 P

\ 2p4 4 S 2

p

4 4 D

/ 2 3 P°

\ 2p5 iP°

ns (n> 3) nd (n> 3)

2s2 2p3

(

4 S°)nz 3, 4s 3 S° 3, 4d 3 D°

/ 3-5s' 3 D° 3, 4d' 3 S° 3, W 3 P° 3-5d' 3 D°

2s2 2p3

(

2 D )nx

\ 3,4s' 4 D° 3, 4d' ip°

3, 4d' >D° 3, 4d' 4 F°

/ 3, 4s" 3 P° 3d" 3 P° 3, 4d" 3 D°

2s2 2p3

( 2 P )wx

t 3, 4s" 4 P° 3d" 4 P° 3, 4d" J D° 3, 4d" l F°

2s 2p4 (

4 P)nx'" 3d'" 3 D

*For predicted terms in the spectra of the O i isoelectronic sequence, see Introduction.

Na V

(N i sequence; 7 electrons) Z=ll

Ground state Is2 2s2 2p

z 4S°^

2pz 1118170 cm-1

I. P. 138.60 volts

Soderqvist has found 45 terms in this spectrum and classified 203 lines in the interval

between 100 A and 514 A. No intersystem combinations have been observed. The series are short and the uncertainty, x, may be considerable.

REFERENCES

J. Soderqvist, Nova Acta Reg. Soc. Sci. Uppsala [IV] 9, No. 7, 75 (1934). (T) (C L) (G D)

J. Soderqvist, Ark. Mat. Astr. Fys. (Stockholm) 32A, No. 19 p. 4 (1946). (I P) (T) (C L)
97

NaV NaV

Author Config. Desig. J Level Interval Author Config. Desig. J Level Interval

2V

4 S2 2s 2 2p3 2p3 4 S° i + 0 f x 1

2 D° 2+

3s' 4 D 2s 2p3 (

3 D°)3s 3sIV 4 D° | to 878288

2V

2 d3 2s2 2p3 2p3 47570 +2 -25 l 3H 2 d2

2 P1 2p

3 2po vx 47595 +x

4s 4 Pi 2s 2 2p2

(3 P) 4s 4s 4 P 892244

641 2V 2s2 2

p

3 X

IX

72454+x 39

4 P2 iy2 892885

2 P2 72498+x 4 p3 2p2 893822 937

2p' 4 p3 4 P2 2s 2p4 2p4 4 P 2y2 i/2 215860

216896 -1036

-544

3? 2 D 2s 2p3

(

3 D°)3s 3sIV 2 D° 1 1/2

l 2+2 }

894095 +x

4 P1 X 217440

2 D 2 +

4s 2 P, 2s 2 2p2

( 3 P)4s 4s 2p y.

895944+x 1203 2p' 2 D3 2s 2p4 2p4 297116+z -34 2 P2 1/2

f X

1 to

897147+s

2 d2 1/2 297150+z

2p' 2 S4 2s 2

p

4 2p4 2 S 34 349987+z 3d' 4 D 2s 2p3(

5 S°)3d 3d"' 4 D° 908717

i sy2 j 2p' 2 P2 2s 2

p

4 2p4 2p 134 371967+x

2 -1200

P1 +2 373167+2 r r x I

2 P2 2p5 2 po

3s' 4 P 2s 2p3(

3 P°)3s 3sv 4po

| to 919070

2p' 2p* IX 567583+

-1628 1 2+2

2 P1 y2 569211 +2

3s 4 P1 2s2 2p2

(

3 P)3s 3s 4 P X 671136 654

4s 2 D 2s2 2p2

(

x D)4s 4s' 2 D I 2+2

l 1+2 }

928053 +x

4 P2 1 X 671790 967 4 P3 234 672757 4d 2 P2 2s 2 2p2

( 3 P) 4d 4d 2 P 1+2

+2 937669+x

3s 2 P1 2s2 2p2

( 3 P)3s 3s 2 P X 682470+2 1203 2 P2 1 X 683673+2 2s2 2p2

( 3 P) 4d 4d 4 D 3+2

3s 2D 2s2 2p2

(

x D)3s 3s' 2 D I 2+

1 1/2 }

709277+2

4d 4 D23

4 Di

J 2+2 1 1+2X

}

939055

939858

-803

Is 2 Si 2s2 2p2

(

1 S)3s 3s" 2 S 34 748640+2 4d 2 F3 2 f4 2s2 2p2

( 3 P)4d 4d 2F 2+2

3+2 940380+2

941392+2 1012

3d 2 P2 2s2 2p2

( 3 P)3d 3d 2 p 134 792337+2

2 -512

P1 >4 792849+2 4d 4 P3 2s 2 2p2

( 3 P)4d 4d 4p 2+2 940716 -213

2s2 2p2

(

3 P)3d 3d 4 D 334

4 p2 1+2 940929

y2 3d 4 D23 J 234

l IX }

797060 -210 4d 2 d2 2s 2 2p2

( 3 P)4d 4d 2 D 1 X 944022+2

4 312 D3 y2 797270 2 d3 2+2 944334+2

3d 2 F3 2s2 2p2

( 3 P)3d 3d 2F 234 797288+2 1247 w 2 F4 2s 2p3(

3 D°)3p 3pIV 2 F 3+ 949462+2

2 -522 F4 334 798535+2 2 f3 2+ 949984+2

3d 4 P3

4 P2

4 P1

2s2 2p2

( 3 P) 3d 3d 4 P 234

134

34

798174

798620

798862

-446

-242

4

d

2F 2s2 2p2

,

x D)4d 4d' 2 F / 3+2

l 2+

I 1 X

l 2+

}

973350+2

3s' 4 S2 2s 2p3

(

5 S°)3s 4 S°

4d 2 D 2s2 2p2

(

x D)4d 4d' 2 D

}

974048+2

3s'" 134 801950

3d 2 d2 2 d3 2s 2 2p2

( 3 P)3d 3d 2 D 134 234 808546+2

808920+2 374

3d' 4 P3

4 P2

4 P1

2s 2p3(

3 D°)3d 3d1 ? 4 P° 2+2

1+2

+2

1004404

1004626

1004794

-222

-168

3d 2 f4 2s2 2p2

(

1 D)3d 3d' 2p 334 828509+2 -183 r x

I to

1 2F3 234 828692+2 3d7 4 D 2s 2p3(

3 D°)3d 3dIV 4 D° 1008214

3d 2 d2 2s2 2p2

( xD)3d 3d' 2 D 134 832075+2 153

[ 3+2 J

2 d3 234 832228+2 3d7 4 S2 2s 2(P

3(3 D°)3d 3dIV 4 S° 1 X 1008941

3d 2 P1

2 P2 2s2 2p2

(

1 D)3d 3d' 2 P 34 134 837431+2

837723+2 292 3d7 2 f4 2 f3 2s 2p3(

3 D°)3d 3diV 2F° 3+

2+

1010088 +2

1010565+

-477

3d 2 Si 2s2 2p2

(

1 D)3d 3d' 2 S 34 842067+2 2 p 2s2 2p2

(

x D)5d 5d' 2p / 3+

1 2+ |

1038208+2

f 34 to

5d

3p' 4 P 2s 2p3

(

5S°)3p 3p'" 4p 847539

2 D 2s2 2p2

(

x D)5d 5d' 2 D / IX

1 2+2 }

1038845+2 1 234 5d

r 134 3d 2D 2s to 2 2p2

(

1S)3d 3d" 2 D 866780+2

1 234 Na vi ( 3 P0) Limit 1118170

1 January 1947.
98

Na y Observed Terms*

Config.

ls2 +

Observed Terms

2s2 2p3 |2p

3 4 S°

2p3 2p° 2p

3 2 D°

2s 2p4 W1 2 S

2pi i-p 2

p

i 2 P 2pi 2 D

2p® 2p5 2 P°

ns (n>3) np (n> 3) nd (n> 3)

2s 2 2p2

(

3 P)nx 3, 4s 4 P

3, 4s 2 P

3,

3, 4d 4 P 3, 4d ±d 2 P 3, 4d

4 D

2 D 3, 4d 2p

2s 2 2p2

(

1 D)nx' 3, 4s' 2 D 3d' 2 S 3d' 2 P 3-5d' 2 D 3-5d' 2 F

2s 2 2p2

(

1 S)nx" 3s" 2 S 3d" 2 D

2s 2p3

( 5 S°)nx'" 3s"' 4 g

° 3 p'" 4 P 3d"’ 4 D°

2s 2p

3

(

3 D°)n2

IV 3s IV 4 D°

3s IV 2 D° 3pIV 2 F

3dIV 4 S° 3di\ 4po 3diy 4 p)o

3div 2p°

2s 2p3

( 3 P°)na:v

J 3sv 4 P°

*For predicted terms in the spectra of the N i isoelectronic sequence, see Introduction.

Na VI

(C i sequence; 6 electrons) Z=ll

Ground state Is2 2s2 2p2 3P0

2p

2 3P0 1390558 cm"1 I. P. 172.36 volts

The analysis is by Soderqvist, who has found 63 terms and classified 134 lines in the range

between 80 A and 638 A. He determines the relative values of terms of different multiplicity

from the series limits, although he lists a few observed singlet-triplet combinations. His term

2p* has been corrected to agree with the two observed combinations.

Soderqvist gives the quintet term 2p

3 5S2 at 103187 cm-1 above the ground state zero. From isoelectronic sequence data Robinson estimates this value as 103508 cm-1

. The later

value has been used in the table and all quintet terms adjusted accordingly. The uncertainty,

x, may be a few hundred cm-1. REFERENCES

J. Soderqvist, Ark, Mat. Astr. Fys. (Stockholm) 32A, No. 19 p. 4 (1946). (I P) (T) (C L)

H. A. Robinson, unpublished material (March 1948). (T)
99

Na VI Na vi

Author Config. Desig. / Level Interval Author Config. Desig. J Level Interval

2P

3 Pn 2s2 2p2 2p2 3 P 0 0 698 3P'

3 D 2s 2p2

( 2 D)3p 3p' 3 D° 1, 2, 3 1040223

3 Pi

3 P2

12 698

1858 11602s 2p2

(

4 P)3d 3d 5 D 0

1 2p w2 2s2 2p2 2p

2 4 D 2 35358 3d' 5D23 {3 j

1041771

2V % 2s2 2p2 2p

2 is 0 74274 4

2p' 5S2 2s 2p

3 2p

3 5g° 2 103508 +x 3d' 5 p3 2s 2p2

( 4 P)3d 3d 5p 3 1045793+2 -427

-328

5 P2 2 1046220 +2

2p' 3 d3 2s 2p3 2p

3 3 D° 3 204131 91

5 Pi 1 1046548+2

3 D2 2 204222 -38 3 Dj 1 204260 3d' 3 P2 2s 2p2

(

4 P)3d 3d 3 P 2 1047408

3 -696 P1 1 1048104

2p' 3 P 2s 2p3 2p

3 3p° 2, 1,0 241341 0

2p' *d2 2s 2p3 2p

3 iD° 2 312175 3d' 3 F2 2s 2p2

(

4P)3d 3d 3 F 2 1053885

612

763

3 f3 3 1054497

2p' 3 Si 2s 2p3 2p3 3 S° 1 320589 3 f4 4 1055260

2p' *P1 2s 2p3 2p

3 ipo 1 350179 3d' 3 D! 2s 2p2

(

4 P)3d 3d 3 D 1 1067760

211 287

3 D? 2 1067971

2p" 3 P? 2p4 2p4 3 P 2 477277 -1320

-559

3 d3 3 1068258

3 P1

3 Po

10 478597

479156 3p' j f3 2s 2p2

(

2 D)3p 3p' ip° 3 1071896

2p" x d2 2p4 2p4 iD 2 539310 3p' x d2 2s 2p2

( 2 D)3p 3p' iD° 2 1077752

2s2 2p(2 P°)3s 3s 3p° 0 2s2 2p(2 P°)4s 4s 3p° 0

3s 3 P1 1 807324 1471 1

3 P2 2 808795 4s 3 P2 2 1090756

3s !Pl 2s2 2p(2 P°)3s 3s ipo 1 817598 3d' 3 F 2s 2p2

(

2 D)3d 3d' 3 F 2, 3,4 1125323

2s2 2p(2 P°)3p 3p 3p 0 4d 3 F2 2s 2 2p(2 P°)4d 4d 3p° 2 1128693

3p 3 P1

3 P2

12 872577

873287 710 34 3d 3F2 2s2 2p(2P°)3d 3d 3 po 2

q 919476 3d' 3 P 2s 2p2

( 2 D)3d 3d' 3 P 0, 1,2 1130631

4 4d x d2 2s2 2p(2 P°)4d 4d iD° 2 1131032

3d xd2 2s 2 2p(2 P°)3d 3d 1P)0 2 920706 4d 3 D! 2s2 2p(2 P°)4d 4d 3D° 1 1133491 380

875

3 D, 2 1133871

3s' *P, 2s 2p2

(

4 P)3s 3s 5 p 1 923059+x 706

943

3 d3 3 1134746

5 P2 2 923765+x

S P3 3 924708+x 3d' 3 D 2s 2p2

( 2 D)3d 3d' 3 D 1, 2,3 1134094

3d 3 Di 2s2 2p(2 P°)3d 3d 3D° 1 929774 225

511

2s 2 2p(2 P°)4d 4d 3p° 0

3 D2 2 929999 1

3 d3 3 930510 4d 3 P2 2 1136378

3d 3 p2 2s 2 2p(2 P°)3d 3d 3p° 2 933915 -548

-282

4d 1 F3 2s 2 2p(2 P°)4d 4d ip° 3 1140721

3 P1 1 934463

3 Po 0 934745 3d' 3 Sx 2s 2p2

(

2 D)3d 3d' 3 S 1 1144276

3d 2s2 2p(2 P°)3d 3d ipo 3 945309 3d' x f3 2s 2p2

( 2 D)3d 3d' ip 3 1147708

3d J Pi 2s2 2p(2P°)3d 3d ipo 1 946392 3d' xd2 2s 2p2

(

2 D)3d 3d' iD 2 1147735

3s' 3 Po 2s 2p2

(

4 P)3s 3s 3 P 0 949778 589

1022

3d' JP1 2s 2p2

(

2 D)3d 3d' 4 P 1 1151140

3 P, 1 950367

3 P2 2 951389 2s 2p2

( 4 P)4s 4s sp 19

3V’

3 Si 2s 2p2

(

4 P)3p 3p 3 S° 1 970835 4s' 6P3 3 1205485+2

2s 2p2

(

4 P)3p 3p 3 D° 1 2s 2p2

(

4 P)4s 4s ap 0

3?' 3 D, 2 996011

723 1

3 D3 3 996734 4s' 3 P2 2 1214191

2s 2p2

( 4 P)3p 3p 3 po 0 2s2 2p(2 P°)5d 5d 3 D° 1 3p' 3 P, 1 1005068

645

2

3 P2 2 1005713 5d 3 d3 3 1228205

3s' 3 D 2s 2p2

(

2 D)3s 3s' 3 D 1, 2,3 1016274 2s2 2p(2 P°)5d 5d 3 po 0

1

3s' 2

j d2 2s 2p2

(

2 D)3s 3s' 3 D 2 1033221 5d 3 P2 1228882
100

Na VI—Continued Na VI—Continued

Author Config. Desig. J Level Interval Author Config. Desig. / Level Interval

5d

1 F3 2s 1 2p(2 P°)5d 5d

1 F° 3 1230972 4d' 3 F 2s 2p2

( 2 D)4d 4d' 3 F 2, 3,4 1334585

2s 2p2

( 4 P)4

d

4d

5 P 1o 4

d' 3 P 2s 2p2

( 2 D)4d 4d' 3 P 0, 1,2 1335519

4

d' fi P3 3 1250152+z 4

d' 3 D 2s 2p2 (

2 D)4d 4d' 3 D L 2,3 1337017

4

d' 3 F2 2s 2p2

( 4 P) 4d 4d

3 F 2 1253369 P17S 2s 2p2

( 4 P)5d 5d

5 P 1

3 f3 3 1253947 qhq 2

3 F4 4 1254750 oUo

5d' sp3 3 1343510+x

4

d' 3 D 2s 2p2

(

4 P)4d 4d 3 D 1, 2,3 1258613 Na vii ( 2 P^) Limit 1390558

CO "s. £ Is 2 2p3 (

4 S°)3p 3 v

ly 3 P 0, 1,2 1265583 5

d' 3 F 2s 2p2

( 2 D)5d 5d' 3 F 2, 3,4 1429862

6d !F3 2s2 2p(2 P°)6d 6d iF° 3 1279991

March 1948. Na vi Observed Terms*

Config.

ls2 +

Observed Terms

2s2 2p2 {2p2 4 S 2p2 3 P

2

p

2 4 D

2s 2p3 (2p3

S

S°

j 2p3 3 S° 2p3 3 P°

2

p

3 J P

0 2p3 3 D°

2p3 1 D°

2p* {

2p4 3 P

2p4 4 D

ns (n> 3) np ( n> 3) nd (n> 3)

2s2 2p(2 P°)na: {

3, 4s 3 P°

3s iP°

3P

sp 3-5d 3 P°

3d 1 P°

3-5d 3 D° 3, 4d 3 F°

3, 4d 1 D° 3-6d 1 F°

2s 2p2

(

4 P)na;

{

3, 4s 5P

3, 4s 3 P 3

p

3 S° 3p 3 P° 3p 3 D°

3-5d 5P

3d 3 P

3d 5D

3, 4d 3 D 3, 4d 3F

2s 2p2

( 2 D)nx'

{

3s' 3 D

3s' 4 D

3p' 3 D°

3

p' iD 0 3p' iF°

3d' 3 S 3, 4d' 3 P

3d' iP

3, 4d' 3 D 3-5d' 3 F

3d' J D 3d' iF

2p

3

(

4 S°)ri2IV 3p lv 3 P

*For predicted terms in the spectra of the C i isoelectronic sequence, see Introduction.

Na vn

(B i sequence; 5 electrons) Z=ll

Ground state Is2 2s2 2p

2P^

2p

2Pj4 1681679 cm-1

I. P. 208.444 volts

All of the terms are taken from Soderqvist’s later publication. The Grotrian diagram in

the earlier paper should be extended to include the more complete analysis of 1944. He has

classified 158 lines in the region between 62 A and 491 A.

The absolute values of the doublet terms are well determined. Those of the quartets are derived from the nd AD° (n= 3, 4, 5) series; and the relative uncertainty x, may be a few

hundred cm-1

. No intersystem combinations have been observed.
101

Na VII—Continued

REFERENCES

J. Soderqvist, Nova Acta Reg. Soc. Sci. Uppsala [IV] 9, No. 7, 93 (1934). (T) (C L) (G D)

J. Soderqvist, Ark. Mat. Astr. Fys. (Stockholm) 30A, No. 11 p. 9 (1944). (I P) (T) (C L)

Na VII Na vn

Author Config. Desig. J Level Interval Author Config. Desig. J Level Interval

2p

2Pj 2s2

(

1 S)2p 2P2 po Z

iz

0

2139

3p' 2 D2 2s 2pOP°)3p 3p' 2 D iz 1251674

2 340 P2 2189 2 d3 2/2 1252014

2

p' 4 Pi 2s 2p2 2p

2 4p z 115187+x 733

1067

3

p

7 2 Pj 2s 2p(1 P°)3p 3p' 2 P z 1253353

4 426 P2 1)4 115920+x 2 P2 IZ 1253779

4 P3 2Z 116987+x

3? 2 Si 2s 2pOP°)3p 3p' 2 S z 1258878

2

p' 2 D3 2s 2p2 2p

2 2 D 2)4 205412 -36 2 d2 1/2 205448

3s" 4 P2 2p2

( 3 P) 3s 3s" 4 P z

1/2 1290221 +x 1534

2

p' 2 Si 2s 2p

2 2p

2 2 S y2 264400 4 p3 2Z 1291755+x

2

p' 2 Y1 2 P2 2s 2

p

2 2p

2 2 P z

i/

283869

285189 1320 3d7 2 F 2s 2p( 1 P°)3d 3d' 2 F° / 2Z

l 3Z |

1292333

2p" 4 S2 2p

3 2p3 4 S

° i/ 367481 +x 4s 2 S4 2s 2

(

J S)4s 4s 2 S z 1294914

2p" 2 D3 2p

3 2p3 2 D° 2/ 412311 -84 3d7 2 D2 2s 2p( 4 P°)3d 3d' 2 D° iz 1303445

2 198 d2 1/ 412395 2 d3 2Z 1303643

2p" 2 Pj 2 P2 2p

3 2p

3 2 po Z

1/

465017

465111 94 3d7 2 P 2s 2p( 1 P°)3d 3d' 2 P° J X,

l IZ |

1306468

3s 2 Sj 2s2

(

1 S) 3s 3s 2 S y2 951347 W1"

2 D2 2p2

(

1 D)3s 3s'" 2 D 1/2 1331137

2 837 d3 2Z 1331974

2s2

(

1 S)3p 3P

2 po z

3p

2 P2 i/ 1008418 4d 2 D2 2s 2

(

1 S)4d 4d 2 D iz 1335809

2 80 d3 2Z 1335889

3d 2 D2 2s 2

(

1 S)3d 3d 2 D 1/ 1060580 119 2 d3 2/ 1060699 2p2

(

3 P)3p 3p" 4 D° z

iz

3s' 4 P4 2s 2p(3 P°)3s 3s 4 po / 1077458 +x 732

1330

2Z

4 P2 1/ 1078190+x 3p" 4 D4 3Z 1338659+x

4 p3 2)4 1079520 +x

2p2

(

3 P)3p 3p" 4 P° z

3s' 2 Pj 2s 2p(3 P°)3s 3s 2 po Z 1103222 1398 1/2

2 P2 1/2 1104620 3p" 4 P3 2Z 1845036 +x

CO 2s 2p(3 P°)3p 3P

2 P Z

1/2 1126810

1127431 621 3p" 2 D 2p2

( 3 P)3p 3p" 2 D° { IZ

l 2/ |

1348721

3

p' 2 Ph 2s 2p(3 P°)3p 3P

2 D 1/ 1154779 1401 3 p" 4 S2 2p2

( 3 P)3p 3p" 4 S° iz 1363160+x

2 d3 2/ 1156180

3p" 2 F3 2p2

(

4 D)3p 3p"' 2F° 2Z 1377822 473 3p' 2 Si 2s 2p(3 P°)3p 3 P

2 S z 1172339 2 f4 3Z 1378295

2s 2p(3 P°)3d 3d 4D° y2 3d" 2 F3 2p2

( 3 P)3d 3d" 2F 2/2 1388500? 469

3d' 4 D2 iz 1185931 +x 259

476

2 F4 3Z 1388969?

4 d3 2/ 1186190+x

1 IZ

l 2Z

4 d4 3/ 1 186666 +x 3d" 2 D 2p2

(

3 P)3d 3d" 2 D

|

1390448?

3d' 2 D2 2s 2p(3 P°)3d 3d 2 D° iz 1186628

2 1257 d3 2/ 1187885 3pT 2 D 2p2

(

4 D)3p 3p'" 2 D° J IZ

l 2Z |

1892764

3d' 4 P3 2s 2p(3 P°)3d 3d 4po 2/ 1192538+x -521

-343

4 P2 I /2 1 193059 +x 3d" 4 P3 2p2

( 3 P)3d 3d" 4 P 2Z 1399238+x -533

-288 4 Pi z 1193402+x 4 P2 iz 1399771 +x

4 Pi z 1400059 +x

3s7 *P 2s 2p(iP°)3s 3s' 2 po I H

1 iz \ 1198287 VA

2X

J 3d" 2 D 2p2

(

4 D)3d 3d"' 2 D l 1415636

3d' 2 F3 2s 2p(3 P°)3d 3d 2p° 2Z 1209908

2 1328 f4 3Z 1211236 2s 2p(3 P°)4s 4s 4 P° z

1/2 3d' 2P2 2s 2p(3 P°)3d 3d 2 po iz 1217189 -766 4s' 4 P3 2Z 1 423050 A-x

*Pi z 1217955
102

Na vil—Continued Na VII—Continued

Author Config. Desig. J Level Interval Author Config. Desig. J Level Interval

col©J 2p2

(

4 D)3d 3d"' 2 p 2/4 334 1428717

1428798 81 4p' 2 D 2s 2p( 1 P°)4p 4p' 2 D / 134

l 234 |

1561885

3d" 2 P!

2 P2 2p2 (*D)3d 3d'" 2 P Vi 134 1432135

1432606 471 7d 2 D 2s 2

(

1 S) 7d 7d 2 D / 134

l 234 |

1570078

4s' 2 P2 2s 2p(3 P°)4s 4s 2 po

34 1/4 1^32595 Id7 2F 2s 2p( 1 P°)4d 4d' 2F° r 234

1 334 |

1577813f

4p' 2 P

!

2 P2 2s 2p(3 P°)4p 4p 2 p 34 134 1442711

1443165 454 5

p' 2 P 2s 2p(3 P°)5p 5p 2 P J 34 l 134 |

1578354

4

p' 2 D2

2 d3 2s 2p(3 P°)4p 4p 2 D 134 2>4 1452095

1453349 1254 5p' 2 D 2s 2p(3 P°)5p 5p 2 D J 134

l 234 |

1583742

5d

2 D2 2s2

(

1 S)5d 5d2 D 134 1461518 70 f 34 1

2 d3 234 1461588 5d' 4 D 2s 2p(3 P°)5d 5d 4 D° 1 to \ 1589481 +x

1 334 1 2s 2p(3 P°)4d 4d 4 D° 34

f 4d' 34 4 D2 134 1462587+

x

44 ] 4 d3 234 1462631 +x 831 5d' 4 P 2s 2p(3 P°)5d 5d 4 P° 3 to \ 1590240+x

4 d4 334 1463462+x l 234 J 2s 2p(3 P°)4d 4d 2 D° 134 5d' 2 F3 2s 2p(3 P°)5d 5d 2 F° 234 1592815 11

4

d' 2 D3 234 1464051 2 f4 334 1593915

4d' 4 P3 2s 2p(3 P°)4d 4d 4 po234

134

1 465059 +x 8d 2 D 2s2

(

1S)8d 8d 2 D f 134

l 234 }

1596400

34

f 34

] 4d' 2 F3 2s 2p(3 P°)4d 4d 2p° 234 1471559 1168 4p" 4 D 2p2(3p)4p 4p" 4 D° 1 to \ 1646320 +x

2 F4 334 1472727 l 334 J 4d' 2 P2 2s 2p(3 P°)4d 4d 2 po

134 1473809 -717 6

d' *p

j 2s 2p(3 P°)6d [ 6d 4 P° r 34 1 2 Pi 34

J 134

l 234

1474526 6

d' 4 D |6d 4 D° 1 to

l 334 1657724+x

6d

2 D 2s2

(

1 S)6d 6d 2 D

j

1529463 4d" 4 P3 2p2

(

3 P)4d 4d" 4 P 234 1668514+x

4 -341

p2 134

34 1668855+x

W 2 P 2s 2p(1 P°)4s 4s' 2 po f 34

l 134 } 1538951

Na viii (

1 S°) Limit 1681679

October 1946. Na vii Observed Terms*

Config.

ls 2 +

Observed Terms

2s2

(

1 S)2p 2p 2 P°

2s 2p2 { 2

p

2 2 S 2p2 4 P

2

p

2 2 P 2p2 2 D

2p

3 |

2

p

3 4 S° 2p3

2

P° 2p3 2 D°

ns (n> 3) np (n> 3) nd (n> 3)

2s2

(

1 S)na; 3,4s 3 S 3p 2 P° 3-8d 2 D

2s 2p(3 P°)na;

{

3,4s 4 P°

3,4s 2 P° 3p 2 S 3-5p 2 P 3-5p 2 D

3-6d

3, 4d

4 P° 3-6d 4 D°

2 P° 3, 4d 2 D° 3-5d 2 F°

2s 2p( 1 P°)na;' 3, 4s' 2 P° 3p' 2 S 3p' 2 P 3, 4p' 2 D 3d' 2 P° 3d' 2 D° 3, 4d' 2 F°

2p2

(

3 P)nx"

{

3s"4 P 3p" 4 S° 3p" 4 P° 3, 4p" 4 D°

3p" 2 D°

3, 4d" 4 P

3d" 2 D 3d" 2 F

2p2

(

1 D)nx'" 3s'" 2 D 3p'" 2 D° 3p'" 2 F° 3d'" 2 P 3d'" 2 D 3d'" 2 F

*For predicted terms in the spectra of the Bi isoelectronic sequence, see Introduction.
103

Na Yin

(Be i sequence; 4 electrons) Z=ll

Ground state Is2 2s2 'S0

2s2 'So 2131139 cm-1I. P. 264.155 volts

Eighty-six lines have been classified by Soderqvist, all but three of which are in the region

between 51 A and 117 A. No intersystem combinations are known, but the absolute term

values are well determined by the series, the relative uncertainty x being probably a few

hundred cm-1

. REFERENCE

J. Soderqvist, Ark. Mat. Astr. Fvs. (Stockholm) 30A, No. 11, p. 7 (1944). (I P) (T) (C L)

Na VIH Na Yin

Author Config. Desig. J Level Interval Author Config. Desig. / Level Interval

2s !S0 2s 2 2s2 iS 0 0 3V' 'Pi 2p(2 P°)3p 3p 'P 1 1432991

2V

3 Po 2s(2 S)2p 2p

3 P° 0 126053 +x 730

1604

3V'

3 Di 2p(2 P°)3p 3P

3 D 1 1439584+2 846

1620

3 Pi 1 126788+x 3 D2 2 1440430+x

3 P2 2 128387 +x 3 d3 3 1442050+2

2v 'Pi 2s(2 S)2p 2V

ip° 1 243223 3p' 3 SX 2p(2 P°)3p 3V

3 S 1 1452568+2

2p' 3 P0 2p2 2p2 3 P 0 327667+2 827

1405

2p(2 P°)3p 3V

3 P 0

3 Pi 1 328494+:r 3 P'3 R 1 1460244+2

3 884 P2 2 329899+2 3 P2 2 1461128+2

2 p' iD2 2p2 2p2 'D 2 361046 3d' 'D2 2p(2 P°)3d 3d iD° 2 1469055

2V

' 1S0 2p2 2

p

2 'S 0 446099 3 V' 'D2 2p(2 P°)3p 3V 'D 2 1474598

3s 3SX 2s(2 S)3s 3s 3 S 1 1240255+2 3 V' 'So 2p(2 P°)3p 3 V

iS 0 1481521

3s !S0 2s(2 S)3s 3s iS 0 1262799 3d' 3 D, 2p(2 P°)3d 3d 3 D° 1 1485329+

292

628

3 D2 2 1485621 +2

3p 'Pi 2s(2 S)3p 3p 'P° 1 1294214 3 l> 3 3 1486249+

3d

3 Di 2s(2 S)3d 3d3 D 1 1327399+2 37

121

3d' 3 p2 2p(2 P°)3d 3d 3 po 2 1492167 +x -642

-358

3 D2 2 1327436+2 3 Pi 1 1 492809 +2

3 d3 3 1327557+2 3 Po 0 1493167+

CO 9 2s(2 S)3d 3d 'D 2 1347756 3d' 'Fa 2p(2 P°)3d 3d ip° 3 1507690

3s' 3 P0 2p(2 P°)3s 3s 3 P° 0 1899858+x 805

1714

3d' 'Pi 2p(2 P°)3d 3d ipo 1 1513677

3 Pi 1 140066S+X

3 P2 2 1402377 +2 4s 3 Si 2s(2 S)4s 4s 3 S 1 1649682+2

3s' iPj 2p(2 P°)3s 3s iP° 1 1 426049 4s 'So 2s(2 S)4s 4s IS 0 1656830

4p 'Pi 2s(2 S)4p 4p ipo 1 1678388
104

Na VIII—Continued Na VIII—Continued

Author Config. Desig. J Level Interval Author Config. Desig. J Level Interval

4d 3 D 2s(2 S)4d 4d 3 D 1, 2,3 1683549+x 5d *D2 2s( 2 S)5d 5d *D 2 1848978

4d j D2 2s(2 S)4d 4d iD 2 1689982 6p x Pi 2s(2 S)6p 6p ip° 1 1930912

4p' iPj 2p(2 P°)4p 4p *P 1 1813205 6d 3 D 2s( 2 S)6d 6d 3 D 1, 2,3 1933601 +x

2p(2 P°)4p 4p 3 D 1 6d j D2 2s( 2 S)6d 6d *D 2 1935242

4p' 3 D2 2 1816179 +x 1 9CQ

3 d3 3 1817462 +x

JLZoO 5p' 3 P 2p(2 P°)5p 5p 3 P 0, 1,2 1988852+x

2p(2 P°)4p 4p 3 P 0

i 5p' ^2 2p(2 P°)5p 5p J D 2 1990558

4p' 3 P2 2 1823044+x 5d' *D2 2p(2 P°)5d 5d »D° 2 1991118

4d' j D2 2p(2 P°)4d 4d >D° 2 1827^72 5

d' 3 D 2p(2 P°)5d 5d 3 D° 1, 2,3 1994540+x

4p' j D2 2p(2 P°)4p 4p *D 2 1827658 5d' 3 P 2p(2 P°)5d 5d 3 P° 2, 1, 0 1995095 +x

2p(2 P°)4d 4d 3 D° 1o

5d' x F3 2p(2 P°)5d 5d 1 F° 3 1998029

4d' 3 D3 3 1 838704+

x

6p' 3 D 2p(2 P°)6p 6p 3 D 1, 2, 3 2077097+x

4d' 3 P2 2p(2 P°)4d 4d 3 P° 2

i 1885175 +x 6d' 3 D 2p(2 P°)6d 6d 3 D° 1, 2, 3 2080630 +x

0 6d' 3 P 2p(2 P°)6d 6d 3 P° 2, 1, 0 2081835 +x

4d' »F, 2p(2 P°)4d 4d J F° 3 1888762 6d' »F3 2p(2 P°)6d 6d !F° 3 2088106

5p

J P! 2s(2 S)5p 5p 1 P° 1 1888911

4d' iPj 2p(2 P°)4d 4d ip° 1 1848884 Na ix ( 2 Sh) Limit 2131139

5d 3 D 2s(2 S)5d 5d 3 D 1, 2,3 1848841 +x

May 1946. Na viii Obsekved Terms*

Config.

2s2

ls 2 +

2s 2 X S

2s(2 S)2p

2p2

{

{

2p

3 P°

2p »P° 2p

2 3 P

2p

2 iS 2p2 *D

Observed Terms

2s(2S)nx J3, 4s

13, 4s

ns (n> 3) np ( n> 3) nd ( n> 3)

3 S

3-6p

1 P°

3-6d 3 D

3-6d

X D

2p(2P°)nx

{

3s 3 P°

3s iP° 3p 3 S 3-5p 3 P 3, 4, 6p 3 D 3-6d 3 P° 3-6d 3 D°3 p 3, 4p

ip 3-5p 3, 4d

1 P° 3-5d 1 D° 3-6d 1 F°

*For predicted terms in the spectra of the Be i isoelectronic sequence, see Introduction.
105

NaiX

(Li i sequence; 3 electrons) Z=ll

Ground state Is2 2s 2S1/2

2s 2S1/2 2418520 cm-1

I. P. 299.78 volts

The analysis is by Soderqvist, who has classified 22 lines in this spectrum. They occur in

the region 81 A to 44 A, with the exception of one line at 681 A.

Some of the relative levels have been connected by a study of the Rydberg denominators in

the isoelectronic sequence rather than by the Ritz combination principle.

REFERENCE

J. Soderqvist, Ark. Mat. Astr. Fys. (Stockholm) 30A, No. 11, p. 1 (1944). (I P) (T) (CL)

Na IX Na IX

Author Config. Desig. / Level Interval Author Config. Desig. J Level Interval

2s 2SX 2s 2s 2 S 0

5v

2 P2 1 5p 5p 2 P° i y2 l 1 X J 2059605

2V

2 Pi 2V 2p

2

2 P° H 1U088 2650 P2 iy2 146688 5d

2 D2 5d 5d 2 D 1 y2 2062835

2 76 d3 2^ 2062911

3s 2 S2 3s 3s 2 S H 1375944

3 v

2 Pi 3V 3p 2 P° y2 1415868 762

6v

2 P2 1 6p 6v

2 P° / H

1 w |

2169668

2 P2 i X 1416130

6d 2 D2 6d 6d 2 D iy2 2171366 187 3d 2 D2 3d 3d 2 D i X 1429980 224

2 d3 2H 2171553

2 d3 2y2 1430204

4s 2 Si 4s 4s 2 S y2 1840336 7p

2 P2 1 7V 7p 2 P° i y2 l 1 X |

2235886

4p

2 P2 i 4p 4p 2 P° { ^

i iy2 j

1856665 7d

2 D2

2 d3 7d 7d 2 D VA

2)4 2237139

2237165 26

4d 2 D2 4d 4d 2 D i y2 2/2 1862222

2 350 d3 1862572

Na x OSo) Limit 2418520

5s 2 Si 5s 5s 2S y2 2051922?

May 1946.
MAGNESIUM

Mg I

12 electrons Z=12

Ground state Is2 2s2 2p6 3s2 'So

3s2 % 61669.14 cm"1 I. P. 7.644 volts

The most complete term array is given in Paschen’s 1931 paper, which has been extensively

used in the present compilation.

Paschen lists the combinations 3d 3D—nf 3F° (n= 4,5) and 3d 'D —n/'F° (n=4-9), deriving

from his infrared observations practically coincident values for the terms nf 3F° and nf 'F° for

n=4 and n —3. Assuming that the two F-series were coincident throughout, Russell, Babcock,

and the writer extended both series by the identification of Paschen’s lines in the Infrared Solar

Spectrum and by the discovery of the constant solar wave-number separation 3d 3D—3d 'D for

predicted successive series members. The constancy of this separation and the behavior of the

solar lines in the disk and spot spectra leave no doubt as to the correctness of the identifications,

although laboratory observations are lacking for confirmation of many of the lines. The term

values in the table for the F-series (nf 'F° to n=\A. and nf 3 F° to n— 12) have been calculated

from solar data, with a slight adjustment to Paschen’s absolute values of 3d 3D and 3d 'D, as indicated in the 1945 reference below.

The three-decimal values listed for the terms 3p 3 P° and 3d 3D are from Meissner’s paper.

Sawyer suggests that Paschen’s 6d 'D term (58023.27 cm-1 in the table) may have the

designation 3p2 'D, in which case the n-values of the higher series members should be decreased

by one unit. In accordance with the observations of Shenstone and Russell on related series,

the nd 'D series may well have absorbed the 3p2 'D term. The present analysis indicates that

throughout the D-series the singlets are lower than the corresponding triplet terms.

The singlet and triplet terms are well connected by intersystem combinations.

REFERENCES

F. Paschen, Sitz. Preuss. Akad. Wiss. 32, 709 (1931). (I P) (T) (C L)

F. Paschen, Ann. der Phys. [5] 12, 511 (1932). (T) (C L)

A. G. Shenstone and H. N. Russell, Phys. Rev. 39, 431 (1932).

H. E. White, Introduction to Atomic Spectra p. 179 (McGraw-Hill Book Co., Inc., New York, N. Y., 1934).

(G D)

K. W. Meissner, Ann. der Phys. [5] 31, 518 (1938). (T) (C L)

L. G. Mundie and K. W. Meissner, Phys. Rev. 65, 265 (1944). (I S) H. D. Babock and C. E. Moore, Astroph. J. 101, 374 (1945). (T) (C L)
107

Mg I Mg I

Config. Desig. J Level Interval Config. Desig. J Level Interval

3s2 3s2 X S 0 0. 00 3s(2 S)7d 7d 3 D 3, 2, 1 59317. 4

3s(2 S)3p 3p 3 P° 0 21850. 368 9n n^s 3s(2 S)7/ 7/ 3 F° 2, 3,4 59400. 77 12

21870. 426

21911. 140

40. 714

3s(2 S)7/ 7/ X F° 3 59400. 77

3s(2 S)3p 3p X P° 1 85051. 86 3s(2 S)9s 9s 3 S 1 59648. 2

3s(2 S)4s 4s 3 S 1 41197. 37 3s(2 S)8d 8d

x D 2 59690. 02

3s (2 S) 4s 4s X S 0 43503. 0 3s(2 S)8d 8d 3 D 3, 2, 1 59880. 3

3s(2 S)3d 3d X D 2 46403. 14 3s (2 S) 8/ 8/ 3 F° 2, 3,4 59985. 88

3s(2 S)4p 4p 3 P° 0,1 47847. 7

4. 1 3s(2 S)8/ 8/ X F° 3 59985. 88 2 47851. 8

3s(2 S)10s 10s 3 S 1 60103. 5

3s(2 S)3d 3d 3 D 3 47957. 035

0. 017

-0. 029 3s( 2 47957. 018 2 S)9d 9d X D 2 60127. 31 1 47957. 047

3s(2 S)9d 9d 3 D 3, 2,1 60263. 0

3s(2 S)4p 4p ip° 1 49846. 6

3s(2 S)9/ 9/ 3F° 2, 3,4 60801. 80

3s(2 S)5s 5s 3 S 1 51872. 36

3s(2 S)9/ 9/ XF° 3 60301. 80

3s(2 S)5s 5s iS 0 52556. 37

3s(2S)lls 11s 3 S 1 60420. 2

3s(2 S)4d 4d iD 2 53134. 70

3s(2 S)10d lOd X D 2 60435. 15

3s(2 S)4d 4d 3 D 3, 2,1 54192. 16

3s(2 S)10d lOd 3 D 3, 2,1 60534. 5

3s(2 S)5p 5p 3 P° 0

3s( 1 2 S)10/ 10/ 3 F° 2, 3,4 60562. 64 2 54252. 6

3s(2 S)10/ 10/ X F° 3 60562. 64

3s(2 S)4/ 4/ 3F° 2, 3,4 54676. 88

3s(2 S)12s 12s 3 S 1 60649. 2

3s(2 S)4/ 4/ X F° 3 54676. 88

3s(2 S)lld lid X D 2 60658. 37

3s(2 S)5p 5p X P° 1 54699. 4

3s(2S)lld lid 3 D 3, 2,1 60734. 0

3s(2 S)6s 6s 3 S 1 55891. 83

3s(2 S)ll/ 11/ 3 F° 2, 3, 4 60755. 78

3s (2 S) 6s 6s iS 0 56187. 03

3s(2 S)ll/ 11/ X F° 3 60755. 78

3s(2 S)5d 5d iD 2 56308. 43

3s(2 S)13s 13s 3 S 1 60820. 9

3s ( 2 S) 5<i 5d 3 D 3, 2,1 56968. 31

3s(2 S)12d 12d X D 2 60826. 6

3s(2 S)6p 6p 3 P° 0,1 57018. 8

1. 3 2 57020. 1 3s(2 S)12d 12d 3 D 3, 2,1 60884. 8

3s(2 S)5/ 5/ 3 F° 2, 3,4 57204. 22 3s(2 S)12/ 12/ 3 F° 2, 3,4 60902. 58

3s(2 S)5/ 5/ iF° 3 57204. 22 3s(2 S)12/ 12/ X F° 3 60902. 53

3p2 3p2 *P 0 57812. 72

20. 56

40. 61

3s(2S)14s 14s 3 S 1 60952. 0 1 57833. 28 2 57873. 89 3s(2 S)13d 13d iD 2 60955. 8

3s(2 S)7s 7s 3 S 1 57853. 5 3s(2 S)13d 13d 3 D 3, 2,1 61002. 2

3s(2 S)7s 7s iS 0 58009. 46 3s(2 S)13/ 13/ X F° 3 61016. 42

3s(2S)6d 6d iD 2 58023. 27 3s(2 S)14d 14d 3 D 3, 2,1 61094. 6

3s(2S)6d

3s(2S)7p

3s(2 S)6/

3s(2 S)6/

6d 3 D 7p 3 P°

6/ 3 F°

6/ X F°

3, 2,1

0, 1,2

2, 3,4 3

58442. 62

58478. 4

58575. 54

58575. 54

3s (2S)14/ 14/ X F° 3 61106. 98

Mg ii (2 Sh) 3p(2 P°)3d

Limit 61669. 14 3d X F° 3 80693. 2

3s(2 S)8s 8s 3 S 1 58962. 49 3p(2P°)3d 3d 3 D° 1 88510. 78

9. 25

16. 24 2 83519. 98

3s(2 S)7d 7d iD 2 59041. 09 3 83536. 22

July 1947.
Mgi Observed Terms*

Config.

Is2 2s2 2 p

6 +

Observed Terms

3s

2 3s2 »S

3s (

2 S) 3p coco hjh-j 0

o

3p

2 3p2 3 P

ns (n> 4) np (n> 4) nd (n> 3) nf (n > 4)

3s(2 S)nx / 4-14s 3 S

\ 4- 7s X S

4-7p

3 P°

4, 5p

iP°

3-14d 3 D

3-13d !D

4-12/ 3 F°

4-14/ JF0

3p(2 P°)nx

{

3d 3 D°

3d !F°

*For predicted terms in the spectra of the Mg i isoelectronic sequence, see Introduction.

Mg II

(Na i sequence; 11 electrons) Z—12

Ground state Is2 2s2 2/>6 3s 2Sy3

3s 2S^ 121267.41 cm-1

I. P. 15.03 volts

The analysis is from Fowler and Paschen-Gotze. Mundie and Meissner calculate the

separation of 3d

2D to be 1.000 ±0.002 cm-1 (entered in brackets in the table). In 1913 A. S. King observed the line at 4481 A (3d

2D—4/2F°) as double, the violet component being about

twice as strong as the red, thus indicating that the term 3d 2D is inverted.

REFERENCES

A. S. King, Astroph. J. 38, 327 (1913). F. Paschen und R. Gotze, Seriengesetze der Linienspektren, p. 103 (Julius Springer, Berlin, 1922). (T) (C L)

A. Fowler, Report on Series in Line Spectra, p. 118 (Fleetway Press, London, 1922). (I P) (T) (C L) R. F. Bacher and S. Goudsmit, Atomic Energy States, p. 273 (McGraw-Hill Book Co., Inc., New York and

London, 1932). (T)

H. E. White, Introduction to Atomic Spectra, p. 98 (McGraw-Hill Book Co., Inc., New York, N. Y., 1934).

(GD)

L. G. Mundie and K. W. Meissner, Phys. Rev. 65, 272 (1944). (I S)
109

Mg II

Config. Desig. J Level Interval

3s 3s 2 S y 0. 00

3P 3v

2 P° K

i H

85669. 43

85760. 97 91. 55

4s 4s 2 S y 69805. 19

3d 3d 2 D 2/2 i/

71490. 41

71491. 32 [-1. 000]

4p 4p

2P° H

i X

80620. 8

80651. 3

30. 5

5s 5s 2 S % 92786. 2

4d 4d 2 D

r m

i 244 }

93312. 1

4/ 4/ 2 F° { 2/

l 3/ | 93800. 0

5p 5p

2 P° y

1/2 97454. 9

97469. 0

14. 1

6s 6s 2 S y 103198. 1

5d 5<3 2 D 1 144 1 244 | 103421. 1

5/ 5/ 2 F° r 2U

l 344 | 108690. 2

6p 6v

2P° y.

i y

105628. 1 105680. 7

7. 6

7s 7s 2 S y 108784. 7

6d 6d

2 D 1 i H

\ 244 }

108900. 9

6/ 6/ 2 F° J 2/

l 3y | 109062. 6

6g 6g

2 G / 3/2 1 4/ }

109073.2

8s 8s 2 S 112129. 8 May 1947.

Mg n

Config. Desig. J Level Interval

7d 7d 2 D f I /2

l 2/ }

112198.0

7/ 7/ 2 F° f 2/

l 3/ } 112301. 8

7<7

9s

7g

2 G

9s 2 S

rf*.

CO }

112310.2

114292. 2

8d 8d

2 D

{ 2/ j 114335. 7

8/ 8/ 2 F° / 2/

1 3y } 114403. 6

8g 8g

2 G / 3y

1 4/ | 114408. 6

9/ 9/ 2 F° / 2/

l 3y } 115845. 1

9g 9<?

2 G f 3/2

l 4y } 115848. 6

10/ 10/ 2 F° f 244 \ 344 } 116875. 7

lOfif 10^ 2 G / 3y

1 4/2 }

116878.2

11/ 11/ 2 F° r 244 t 344 | 117638. 3

110 11<7 2 G { 3 y

1 4y } 117640. 6

12/ 12/ 2 F° f 2/

1 3/2 }

118218.5

12<7 12<7 2 G / 3/2 1 4/ }

118220.2

Mg hi OSo) Limit 121267. 41

Mg in

(Ne i sequence; 10 electrons) Z= 12

Ground state Is2 2s2 2p

6

2p

6 XS0 646364 cm-1

I. P. 80.12 volts

The analysis has been taken from Soderqvist’s Monograph. The term designations he

assigns on the assumption of i*S'-coupling are given with his notation under the heading “Author” in the table.

As for Ne i, the ^-coupling notation is introduced in the general form suggested by Racah.

Shortley has, however, pointed out that the configurations 2p5 3s, 2p

5 3p, and 2p

5 3d are much

closer to Z$-coupling than to ^-coupling.

REFERENCES

J. Soderqvist, Nova Acta Reg. Soc. Sci. Uppsala [IV] 9, No. 7, 22 (1934). (I P) (T) (C L) (G D).

G. Racah, Phys. Rev. 61 , 537 (L) (1942). G. Shortley, unpublished material (1948).
110

Mg

m Mg hi

Author Config. Desig. J Level Author Config. Desig. J Level 2V *80 2p6 2p6 ‘S 0 0. 0 4d 3 Pi 2pS(2 P!*)4d 4d [ Kl° 01 581747

3s 3 P2 2PK2 PJh)3s 3s [1H1° 2 425649. 1 4d J Pi ft 4d [1J4]° 1 583448 3 Px 1 426877. 0

2p5 ( 2 P^)3s

2p5(2 PA)4d 4d'[lK]° 2

3s 3 Po 3s' [ K]° 0 427861. 1 4d 3 Dj 1 585473 J Pi

3p [ K] 1 481589. 0

2p5 ( 2 Pfo) 5s 5s [l‘/2]° 2

3pio 3 Si 2p3 ( 2 p!H)3p 1 467387. 3 5s 3 Pi 1 589116

3pfl 3 D3 tt 3p [254] 3 474062. 6 2p5(2 P£)5s 5s' [ Kl° 0 3ps 3 d2 2 474663. 6 5s J Pi 1 591191

3®? 3 Di n

3p [IK] 1 475511. 4 3p8 J D2 2 477444. 9 2p5 ( 2 Pf^) 5d 5d [ K]° 0

3p [ tt] 5d 3 Pi 1 605845

3p3 3 Po tt 0 479275. 3 5d ‘Pi ft 5d [I/2] 0 1 606280

3p6 'Pi 2p5(2 p°) 3p 3p'[lJ4] 1 478383. 8

2p5( 3p4 2 PA)5d 3 P2 2 478855. 5 5d'[lK]° 2 5d 3 D, 1 608382

3p2 3 Pi ft 3p'[ K] 1 479465. 4

3pi ‘So 0 484439. 3 2pK2 P!h) 6s 6s [IK] 0 2 6s 3 Pi 1 609166 3d 3 Pn 2p

s(2 P!H)3d 3d [ K]° 0 530186. 4 2p5 ( 2 P£) 6s 3 Pi 1 580429. 5 6s' [ K]° 0 6s ‘Pi 1 611299

3d 3 P2 tt 3d [1541° 2 580972. 0

3d 3 F4 If o\<N CO CO h\ 4 531569. 9 6d ‘Pi 2p5 ( 2 Pf

M)6d 6d [1541° 1 618483 3 F3 3d [254]° 3 581888. 5

2p5 ( 2 P£)6d 6d'[lK]° 2 3d 3 f2 If 2 582731. 8 6d 3 D, 1 620598

‘Fs 3 582978. 0

3d *P1 tt 3d [1J4]° 1 534204. 1 7d ‘Pi 2p5 ( 2 Pfo)7d 7d [1K]° 1 625958

3d ‘d2 2p5 ( 2 p£)3d 3d'[2K]° 2 584782. 2 2p5 ( 2 P^)7d 7d'[lK]° 2 3 d3 3 584981. 0 7d 3 D! 1 628105

3d 3 D2 tt 3d'[lKl° 2 535185. 9 3 DX 1 586156. 7 8d ‘Pi 2p5 ( 2 p^)8d

rH r-N. 0 00 1 680795

2p5(2PfH)4s 4s [154]° 2

4s 3Pi 1 546529

Mg iv ( 2 Pfo) Limit 646364

2p5(2 PA)4s 4s' [ y2 ]° 0

4s 2Pi 1 548727 Mg iv ( 2 P£) Limit 648590

July 1947.
Ill

Mg iii Observed Levels*

Config.

Is2 2s2 +

Observed Terms

2p

6 2p

6 »S

ns (n > 3) np (n> 3) nd (n>3)

2p5 (2 P°)nx f 3-6s 3 P°

\ 3-6s iP°

3p

3 S 3p3 P 3p

3 D

3p

J S 3p

iP 3p

2 D

3-5d 3 P°

3-8d iP° 3-7d 3 D° 3d 3 F°

3d l ~D° 3d 1 F°

jZ-Coupling Notation

Observed Pairs

ns (n > 3) np (n > 3) nd (n > 3)

2p5

(

2Tiy)nx 3-6s [iy2]° 3p [ HI

3p

[2V2] 3p [i y2\

3-5d [ y2]° 3d [3V2]° 3-8d [iy2]° 3d [2 y2 ]° 2p5 (

2 P£i) nx

' 3-6s'

[ y2]° 3P

' 3p' [ y2] 3d' [2 y2 y

3-7d'

[1 y2]°

*For predicted levels in the spectra of the Nei isoelectronic sequence, see Introduction.

Mg iv

(Fi sequence; 9 electrons) Z= 12

Ground state Is2 2

2 2p5 2P°^

2p5 2Flya 881759 cm-1

I. P. 109.29 volts

The analysis is by Soderqvist, who has classified more than 70 lines, 13 in the interval

1459 A to 1956 A, and the rest between 123 A and 323 A.

From later isoelectronic sequence data Robinson has revised Soderqvist’s 3d' 2S and

4d 2D terms, rejected his 3d 4D term, and added 3d 2F; 3, 4d

4P; 3d 4F, and 3d' 2F. These revisions have been incorporated into the table.

Intersystem combinations connecting the doublet and quartet systems of terms, have

been observed.

REFERENCES

J. Soderqvist, Nova Acta Reg. Soc. Sci. Uppsala [IV] 9 , No. 7, 39 (1934). (I P) (T) (C L)

H. A. Robinson, unpublished material (March 1948). (T) (C L)
112

Mg iv Mg iv

Config. Desig. J Level Interval Config. Desig. J Level Interval

2s2 2

p

5 2p5 2po 1 / 0 -2226 2s2 2p4

(

x D)3d 3d' 2 P X 711622

243 X 2226 1/2 711865

2s 2

p

6 2p

6 2 S x 311527 2s2 2p4 (

x D)3d 3d' 2 D 1/2 2/2 712120

713389 1269

2s2 2p 4 (

3 P) 3s 3s 4 P 2/ 543727. 0 -1416. 5 -818. 6

1/2 545143. 5 2s2 2p4

(

x D)3d 3d' 2 F 3/2 X 545962. 1 2/2 713660

2s2 2p4

( 3 P) 3s 3s 2 p 1/2X

553659

555338 -1679 2s2 2p 4 0D)3d 3d' 2 S X 714330

2s2 2p4 (

3 P)4s 4s 2 P 1/2 723254 -1555 2s2 2p4

(

x D)3s 3s' 2 D 2/2 582571 -18 X 724809

1/2 582589

2s2 2p4 (

x S)3d 3d" 2 D 2/2 752927 -38

2s2 2p4

( 3 P)3p 3v

4 po 2/2 596527. 8 -544. 6 -518. 0

1/2 752965

1/2X

597071. 9

597589. 9 2s2 2p4

(

3 P)4d 4d 2 D 2/2

1/2 767454

770799 -3345

2s2 2p4

( 3 P)3p 3p 4 D° 31/2 603148. 8 -864. 1 -659. 2 2/ 604007. 4 2s2 2p4

( 3 P)4d 4d 4 P X

1/2 604666. 6 1/2 767769 959 X 2/2 768728

2s2 2p4

( 3 P)3p 3p 4 S° 1/2 612240. 3 2s2 2p4

( 3 P)4d 4d 2 P X

1/2 769397

770056 659

2s2 2p4

(

x S)3s 3s" 2 S X 624102

2s2 2p4

(

x S)4s 4s" 2 S X 797062

2s2 2p4

( 3 P) 3d 3d 4 P 2/2 676837 -968

!X

X

677805

2s2 2p4 (

x D)4d 4d' 2 P J X

l ix }

802272

2s2 2p4

( 3 P)3d 3d 4F 4X

3/2 2s2 2p4 (

x D)4d 4d' *D I 1/2 l 2/2 }

803023

2/2

1/2 677355 2s2 2p 4 (

x D)4d 4d' 2 S X 803769

2s2 2p4

( 3 P)3d 3d 2 D 2/2 678403 -1627 2s2 2p4

( 3 P) 5d 5d 2 D 2/2 809677 -1685

1/2 680030 1/2 811362

2s2 2p4

(

3 P)3d 3d 2p 3/2 2/2 680510 2s2 2p4

(

3 P)5d 5d 2 P / X

l 1/2 }

810543

2s2 2p4 (

3 P) 3d 3d 2 P X 681024 1447

IX 682471

Mg v ( 3 P2 ) Limit 881759

March 1948. Mg iy Observed Terms*

Config.

ls2 +

Observed Terms

2s2 2p5

2s 2p6

2s2 2p4 (

3 P)nz

2s2 2p 4

(

1 D)nz'

2s2 2p4 (

1 S)nz"

2p5 2po

2p6 2 S

ns (n>3) np (n> 3) nd (n> 3)

/ 3s 4 P

\ 3, 4s 2 P

3s' 2 D

3, 4s" 2 S

3p 4 S° 3p 4 P° 3p 4 D° 3, 4d 4 P 3d 4 F

3-5d 2 P 3-5d 2 D 3d 2 F

3, 4d' 2 S 3, 4d' 2 P 3, 4d' 2 D 3d' 2 F

3d" 2 D

*For predicted terms in the spectra of the Fi isoelectronic sequence, see Introduction.
113

Mg y

(O i sequence; 8 electrons) Z= 12

Ground state Is2 2s2 2p4 3P2

2_p

4 3 P2 1139421 cm-1

I. P. 141.23 volts

Soderqvist has found 53 terms and classified 113 lines in this spectrum in the interval

between 92 A and 355 A. No intersystem combinations have been observed and the uncertainty,

x, may be considerable.

REFERENCE

J. Soderqvist, Ark. Mat. Astr. Fys. (Stockholm) 32A, No. 19 p. 4 (1946). (I P) (T) (C L)

Mg v Mg v

Author Config. Desig. J Level Interval Author Config. Desig. J Level Inter- val

2p 3 P2 2s2 2p4 2p4 3 P 2 0 -1780

-739

3d 3 D3 2s2 2pH*P°)3d 3d" 3D° 3 902047 -394

-241

3 Pi 1 1780 3 d2 2 902441

3 Po 0 2519 3 D: 1 902682

2p ‘L)2 2s2 2p4 2p4 4 D 2 36348+z 3d ‘Pi 2s2 2p3(2 p°) 3d 3d" ipo 1 902907+x

2v ‘S„ 2s2 2

p

4 2p

4 4 S 0 77712+x 3d ‘F, 2s 2 2p3(2p°)3d 3d" ipo 3 905211 +x

2p' 3 P2 2s 2

p

5 2p5 3po 2 283211 -1616

-881

4s 3 Si 2s2 2p3(4S°)4s 4s 3 S

° 1 910639

3 Pi

3 Po

10 284827

285708 3s' 3 P2 2s 2p4 (

4 P) 3s 3s'" 3p 2 940455

3 -593

Pi 1 941048

2p' ‘Pi 2s 2

p

5 2p5 ipo 1 397906 +x 0 3s 3 Si 2s2 2p3(4S°)3s 3s 3 S° 1 684544 4s 3D 2s2 2p3(2D°)4s 4s' 3D° 3, 2,1 962027

3s 3 D3 2s2 2p3 (

2 D°)3s 3s' 3D° 3 727718 -45

-24

4d 3 Di 2s2 2p3(4S°)4d 4d 3D° 1 962378 1732

3 d2 2 727763 3 D2 2 962395

3 Dj 1 727787 3 d3 3 962427

3s ‘D2 2s2 2p3

( 2 D°)3s 3s' iD° 2 735976 +x 4s ‘D2 2s2 2p3(2D°)4s 4s' 1D° 2 965189+x

2s2 2p3

( 2 P°)3s 3s" 3po 0 4s 3P 2s2 2p3(2p°)4s 4s" 3p° 0, 1,2 990599 * 3s 3 Pi 1 756536

3 53 P2 2 756589 4s ‘Pi 2s2 2p3 (2p°)4s 4s" ipo 1 993795+x

3s ‘Pi 2s2 2p3

(

2 P°)3s 3s" ipo 1 765049 +x 5s 3 S! 2s2 2p3

(

4 S°)5s 5s 3g° 1 1002125

3d 3 D, 2s2 2p3

(

4 S°)3d 3d 3 D° 1 821963

1494

4d 3D 2s2 2p3 (2D°)4d 4d' 3D° 1, 2,3 1013878

3 D2

3 D3 2

3 821977

822071 4d ‘Pi 2s2 2p3 (2D°)4d 4d' ipo 1 1015981 +x

3d 3D 2s2 2p3

(

2 D°)3d 3d' 3D° 1, 2,3 871221 4d 3 P2 2s2 2p3 (2D°)4d 4d' 3p° 2 1017590

3 -382

Pi 1 1017972

3d ‘Pi 2s2 2p3(2D°)3d 3d' ipo 1 878862+x 0

3d 3 P2 2s2 2p3

(

2 D°)3d 3d' 3p° 2 876762 -482

-200

4d ‘D2 2s2 2p3(2D°)4d 4d' iD° 2 1018840+x

3 P, 1 877244

3 Po 0 877444 4d ‘F3 2s2 2p3(2D°)4d 4d' ipo 3 1019918+x

3d ‘D2 2s2 2p3(2D°)3d 3d' ID0 2 878028+x 3? 3 D, 2s 2p4

(

2 D)3s 3sIV 3D 1 1020311 64

93

3 D2 2 1020375

'3d 3 Si 2s2 2p3(2D°)3d 3d' 3 S

°

1 879485 3 d3 3 1020468

3d ‘F3 2s2 2p3 (

2 D°)3d 3d' ipo 3 883210+x 3p' *D 2s 2p4 (

4 P)3p 3p'" 3D° 1, 2,3 1026283

3d 3 Po 2s2 2p3 (2p°) 3d 3d" 3p° 0 898673 231 5d 3 D 2s2 2p3(4S°)5d 5d 3D° 1, 2, 3 1026774

3 P; 1 898904

3 387 P2 2 899291 — 0 —

‘D2 4d 3 P, 2s2 2p3(2p°)4d 4d" 3 po 1 1042481 200 3d 2s2 2p3(2p°)3rf 3d" 1D° 2 901872+

*P2 2 1048681
114

Mg v—Continued Mg V—Continued

Author Config. Desig. J Level Inter- val

Id 3D 2s2 2p3

(

2 P°)4d 4d" 3D° 1,2,3 1048818

5 >d2 2s 2 2p3

(

2 P°)4d 4d" iD° 2 1045766 +x

la ‘Pi 2s 2 2p3 (

2 P°)4d 4d" ipo 1 1046201 +x

Td ‘F, 2s2 2p3

(

2 P°)4d 4d" lp° 3 1046625 +x

5s 3D 2s2 2p3

(

2 D°)5s 5s' 3D° 3, 2,1 1054921

3d' 3D 2s 2p4

(

4 P)3d 3d"' 3D 1, 2,3 1075102

5d 3D 2s2 2p3

(

2 D°)5d 5d' 3D° 1, 2,3 1079431

Id 3 P* 2s 2 2p3

(

2 D°)5d 5d' 3p° 2 1081883 -263 3 Pi 1 1082146

0

Author Config. Desig. J Level Inter- val

5d 4 D2 2s2 2p2 (

2 D°)5<3 5d' 'D° 2 1082461 +x

5d !F3 2s2 2p3(2D°)5d 5d’ 4 F

0 3 1082855+x

Sll o 2s 2 2p3(2po

) 5d 5d" 1 D° 2 11 10858 +x

Mg vi (

4 Sjh) 2s 2p4 (

4 P)4s

Limit 1139421

4s' 3 P2 4

s'" 3 p 2

1 1161768

0

3d' 3D3 2s 2p4 ( 2 D)3d 3dIV 3 D 3 1166471 -81

-74

3 d2 2 1166552

3 D] 1 1166626

5s' 3p2 2s 2p4 (

4 P)5s 5s'" 3 P 2

1 1250956

0

February 1947. Mg v Observed Terms*

Config.

ls 2 +

Observed Terms

2s2 2

p

4 { 2p4 4 S

2p4 3 p

2

p

4 4 D

2s 2

p

5 {

2p5 3p°

2

p

5 4 P°

ns (n > 3) np (n > 3) nd (n> 3)

2s2 2p3

(

4 S°)nx 3-5s 3 S° 3-5d 3D°

2s2 2p3

( 2 D0)nx'

{ 3-5s' 3D°

3,4s' >D°

3d' 3S° 3-5d' 3 P°

3,4d' 4 P°

3-5d' 3D°

3-5d' >D° 3-5d' 4 F°

2s2 2p3(2 P°)nx"

{

3,4s" 3 P°

3,4s" 4 P°

3, 4d" 3 P°

3, 4d" ip°

3,4d" 3D°

3-5d" T° 3, 4d" 1 F°

2s 2p4 (

4 P)nx'" 3-5s"' 3 P 3p"' 3 D° 3d'" 3D

2s 2p4 (

2 D)na:IV 3s IV 3 D 3d IV 3 D

*For predicted terms in the spectra of the O i isoelectronic sequence, see Introduction.

Mg vi

(N i sequence; 7 electrons) Z= 12

Ground state Is2 2s2 2p

z 4Sj^

2p

z 4S^ 1507520 cm"1 I. P. 186.86 volts

The analysis is by Soderqvist, who has found 56 terms and classified 124 lines in the range

72 A to 403 A. No intersystem combinations have been observed. The observations indicate an evident typographical error in the published absolute value of 2p

A 2P, which has been cor- rected. The series are short and the uncertainty, x, may be considerable.

REFERENCE

J. Soderqvist, Ark. Mat. Astr. Fys. (Stockholm) 32A, No. 19 p. 4 (1946). (I P) (T) (C L)
115

Mg vi

Author Config. Desig. J Level Inter- val

2V

4 S2 2s2 2p3 2p

3 4 S° ik 0

2P

2 d3 2s2 2

p

3 2p

3 2 D° 2% 5J+l50Arx -21 2 d2 IK 54171 +x

2P

2 P, 2s2 2p3 2p

3 2po y2 82710+x 122 2 P2 iy2 82832 +2;

2p' 4 p3 2s 2p4 2p4 4 P 234 247945 1633 4 p2

4 P1

1/2

/2 249578

250445 -867

2p' 2 d3 2s 2p4 2p4 2 D 2J4 340551 -\-x -33 2 d2 1/2 340584+x

2p' 2 S4 2s 2p4 2p4 2 S 400619+s

2p' 2 P?, 2s 2p4 2p4 2P 1/2 423981+2 -1957 2 P1 /2 425938+x

3s 4 Pt 2s2 2p2

(

3 P)3s 3s 4P /2 893943 944

1556

4 p2 IK 894887

4 p3 2K 896443

3s 2 P1 2s2 2p2

(

3 P)3s 3s 2 p K 907202+2 1894 2 P2 IK 909096+2

3s 2 D 2s2 2p2

(

1 D)3s 3s' 2 D

/IK

\2K }

937628+2

3s JSi 2s2 2p2 (

1 S)3s 3s" 2S K 982218+2

3d 2 P2 2s2 2p2 (

3 P)3d 3d 2 P IK 1038855+2 -617 2P1 K 1039472+2

2s2 2p2

(

3 P)3d 3d 4 D 3K

3d 4 D23 2K l IK / 1045205 -415

4 DX K 1045620

3d

j f3 2s2 2p2

(

3 P)3d 3d 2 F 2h 1045212+2 1967 *f4 3K 1047179+2

3s' 4 s, 2s 2p3 (

5 S°)3s 3s'" 4 S° IK 1046634

3d 4 p3 2s2 2p2

(

3 P)3d 3d <P 2K 1047307 -680

-396

4 P2

4 P1 IK

K

1047987

1048383

3d 2 D2 2s2 2p2

(

3 P)3d 3d 2 D IK 1060848+2

2 563 d3 2K 1061411+2

3d 2 f4 2s2 2p2

(

J D)3d 3d' 2 F 3K 1082132+2

2 -306 f3 2K 1082438+2

3d 2 d2 2s2 2p2

(

1 D)3d 3d' 2 D IK 1085361+2

2 357 d3 2K 1085718+2

3d 2 P1 2s2 2p2 (!D)3d 3d' 2p K 1092558+2

2 488 P2 IK 1093046+2

Mg vi

Author Config. Desig. Level Inter- val

3d 2 S: 2s2 2p2

(

1 D)3d 3d' 2 S K 1097978+2

3p' 4 P 2s 2p3 (

5S°)3p 3p'" 4 P

f K

\ to 1100146

i 2K J

f K 1 3s' 4 D 2s 2p3

(

3 D°)3s 3sIV 4 D° \ to >1122023

l 3K J

3d 2 D 2s2 2p2

(

4 S)3d 3d" 2 D

/IK

\2K |ll23683+2

3? 2 D 2s 2p3

(

3 D°)3s 3sIV 2 D° f iK

\2K }l 149688+

_ f K } 3s' 4 P 2s 2p3 (

3 P°)3s 3sv 4 po

\ to \ 1172608

i 2K J

r k 1 3d' 4 D 2s 2p3

(

5 S°)3d 3d'" 4 D° 1 to 1175396

1. 3/2 J 3? 2 P, 2s 2p3 (

3 P°)3s 3sv 2 po K 1191126+

2 306 P2 IK 1191432+x

2s2 2p2

(

3 P)4s 4s 4 P K

IK

4s 4 p3 2K 1196740

2s2 2p2

(

3 P)4s 4s 2 p K

4s 2 P2 IK 1198265+2

3p' 2 f4 2s 2p3

(

3 D°)3p 3pIV 2F 3K 1222074+2

2 -635 f3 2K 1222709+2

4s 2 D 2s2 2p2

(

1 D)4s 4s' 2 D f IK

\2K }l234487+2

2s2 2p2 (

3 P)4d 4d 4 D 3K

4d f 2K UK |l248829 -671

4 Di K 1249500

4d 2 F3 2s2 2p2 (

3 P)4d 4d 2F 2K 1251503+2

2 1645 f4 3K 1253148+2

4d 4 P3 2s2 2p2

(

3 P)4d 4d 4P 2K 1252238 -424

-204 4P2 4P1 IK

K

1252662

1252866

2s2 2p2

( 3 P) 4d 4d 2 D IK

4d 2 D3 2K 1257189+2

3d' 4 P3 2s 2p3

(

3 D°)3d 3dIV 4po 2K 1282028 -370

-270

4 P2

4P1 IK

K

1282898

1282668
116

Mg VI—Continued Mg VI—Continued

Author Config. Desig. J Level Inter- val Author Config. Desig. J Level Inter- val

f H ] 2s2 2p2 (

3 P)5d 5d 4 D 3/

3d' 4 D 2s 2p3 (

3 D°)3d 3dIV 4 D° { to

[ 3

X4

\ 1287044 5d 4 D23 J 2/

II /2/2

2/2

} 1342985

4d 2 F 2s2 2p2

(

x D)4d Ad' 2 F

f 3/2 12H }l287104+x

5d

2 f3 2s2 2p2

(

3 P) 5d 5d 2JP 1344310+x

2 1746 f4 3/ 1346056+x

3d' 4 S2 2s 2p3 (

3 D°)3d 3dIV 4 S° 1/2 1287889

5d

4 p3 2s2 2p2

( 3 P)5d 5d 4 P 2/ 1345550

3d' 2 F4 2s 2p3

(

3 D°)3d 3dIV 2JT° 3/2 1288400 +x -861 1/2

2 f3 2/2 1289261 +x H

4d 2 D 2s2p2

(

x D)4d Ad' 2 D / 1/2 12/2 }l289787+x Ad' 4 D 2s 2p3 (

5S°)4d Ad'" 4 D° f 1/2

< to 1373760

[ 3/2 J 4

2 P 2s2 2p2

(

x D)4d Ad' 2 P / /

11/2 |l292939+x

2s2 2p2

(

3 P)6s 6s 4 P X

1/2 Ad 2s2 2p2

(

x D)4d Ad' 2 S /2 1295321 +x 6s 4 P3 2/2 1380643

5s 4 p2 2s2 2p2 (

3 P)5s 5s 4 P /

1/2 1317697 973

5d

2 F 2s2 2p2

(

x D)5d 5d' 2JT / 3/2 12/2 j-1381572+x

4 p3 2/2 1318670

4s' 4 S2 2s 2p3

(

5 S°)4s As"’ 4 S° 1/2 1328609 5

2 D 2s2 2p2 (x D)5d 5d' 2 D / 1 h

12/2 |l383088+x

Td 2 D 2s2 2p2 (

x S)4d Ad" 2 D f 1/2 12/2 |l332285+x

5d' 4 D 2s 2p3 (

5 S°)5d 5d'" 4 D° f /2

1 to \l 468928

[ 3/2 I

r h

4p' 4p 2s 2p3 (

5S°)4p Ap'" 4 P I to

j 1340950

[ 2/2 Mg vii (

3 P0) Limit — 1507520

February 1947. Mg vi Obsebved Tekms*

Config.

ls2 +

Observed Terms

2s2 2p

l | 2p

3 4 S°

2

p

3 2 P° 2p3 2 D°

2s 2p4 { 2p4 2 S 2p4 4 P

2

p

4 2 P 2

p

4 2 D

ns (n> 3) np {n> 3) nd (n> 3)

2s2 2p2

(

3 P)nx

{

3-6s 4 P

3,4s 2 P

3-5d 4 P

3d 2 P

3-5d 4 D

3, 4d 2 D 3-5d 2 F

2s2 2p2

(

x D)rcx' 3,4s' 2 D 3,4d' 2 S 3, 4d' 2 P 3-5d' 2 D 3-5d' 2 F

2s2 2p2 (

x S)«x" 3s" 2 S 3, 4d" 2 D

2s 2p3

(

5 S°)nx'" 3, As’" 4 S° 3, Ap'" 4 P 3-5d'" 4 D°

2s 2p3

( 3 D°)nx IV {

3s IV 4 D°

3sIV 2 D° 3p!v 2 -p 3dIV 4 S° 3dIV 4 P° 3dIV 4 D°

3dIV 2F°

2s 2p3 (

3 P°)nx v

{ 3sv 4 P°

3sv 2 P°

For predicted terms in the spectra of the N I isoelectronic sequence, see Introduction.
117

Mg vii

(C i sequence; 6 electrons) Z= 12

Ground state Is2 2s2 2_p

2 3P0

2p

2 3 P0 1817734 cm"1 I. P. 225.31 volts

Soderqvist has found 56 terms and classified 114 lines in this spectrum in the range 58 A to 434 A. He determines the relative values of the singlet, triplet, and quintet systems of terms

from the series limits.

Soderqvist gives the quintet term 2p35S2 at 118134 cm-1 above the ground state zero. From isoelectronic sequence data Robinson estimates this value as 118620 cm-1

. The later

value has been used in the table and all quintet terms adjusted accordingly.

The uncertainties x and y may be considerable.

REFERENCES

J. Soderqvist, Ark. Mat. Astr. Fys. (Stockholm) 32A, No. 19 p. 4 (1946). (I P) (T) (C L)

H. A. Robinson, unpublished material (March 1948). (T)

Mg vii Mg vii

Author Config. Desig. J Level Inter- val Author Config. Desig. / Level

Inter- val

2V

3 Po 2s2 2p

2 2p2 3 P 0 0 1127 3d 3 D, 2s2 2p(2 P°)3d 3d 3D° 1 1191753 432 3 P1 1 1127 IQIO 3 D2 2 1192185

3 P2 2 2939 3 d3 3 1193061

2p * 1)2 2s2 2p

2 2p2 4 D 2 41459 + x 3d 3 p2 2s2 2p(2 P°)3d 3d 3po 2 1196770 699 3 P, 1 1197469 403

2p 2s2 2p

2 2p2 iS 0 85647 +a; 3 Po 0 1197872

2p' 5S2 2s 2p

3 2p3 5S

° 2 1 18620+

y

3s' 3 Pn 2s 2p2

(

4 P)3s 3s 3 P 0 1211173 882 3 Pi 1 1212055 1 aoA 2p' 3 D3 2s 2p3 2p 3D° 3 232865 1 in 3 P2 2 1213679

3 D2 2 232975 c;o

3 Di 1 233027 06

3d >f3 2s2 2p(2 P°)3d 3d ipo 3 1212323+x

2p' 3 P 2s 2p3 2p

3 3p° 2, 1,0 27+922 3d 3Pi 2s2 2p(2 P°)3d 3d ipo 1 1213297 +x

2p' 1 D2 2s 2

p

3 2p

3 1 D° 2 354923 +x 3P' •Si 2s 2p2

(

4 P)3p 3p3 S° 1 1235329

2p' 3 St 2s 2

p

3 2p

3 3 S° 1 362128 2s 2p2

(

4 P)3p 3P 3D° 1 3p' *d2 2 1264827 1249

2p' *P1 2s 2

p

3 2p

3 ipo 1 397655 +x 3 d3 3 1266076

3s 3 Po 2s2 2p(2 P°)3s 3s 3p° 0 1047624 761 3p' 3 P 2s 2p2

(

4 P)3p 3p

3po

0, 1,2 1276520

3 P1 1 1048385 2521 3 P2 2 1050906 ~ 3 D 2s 2p2

( 2 D)3s 3s' 3 D 1, 2,3 1285196

3s *P1 2s2 2p(2 P°)3s 3s ipo 1 1061534+

w 3 D 2s 2p2

(

2 D)3p 3P' 3D° 1,2,3 1299244

3p

3Po 2s2 2p(2 P°)3p 3p

3 P 0 1123745

3 Pi 1 1124937 LLV6

3s' !D2 2s 2p2

(

2 D)3s 3s' ID 2 1305806 +x

3 P2 2 1125850 yio

2s 2p2

(

4 P)3d 3d 5D 0

3d 3 F2 2s2 2p(2 P°)3d 3d 3p° 2 1178758+x 1 3

4

3d' 6lJ23 2

3 |l317618+2/

3s' BP1 2s 2p2

(

4 P)3s 3s 6p 1 1179696 + ?/ 4

6 P2 2 1180484+?/ too

1 A *70 3d' 5 P3 2s 2p2 (

4 P)3d 3d ep 3 1323222 +y -667

6 P3 3 11 81 963 + ?/- 5 P2 2 1323889+?/ —422

B P1 1 1324311 +y 3d *D2 2s2 2p(2 P°)3d 3d ID0 2 1181424 +x
118

Mg VII—Continued Mg VII—Continued

Author Config. Desig. J Level Interval Author Config. Desig. Level Inter- val

3d' 3 P2 2s 2p2

( 4 P)3d 3d 3 P 2 1324975 -1058

-535

2s 2p2 (

4 P)4s 4s sp 1

3 P, 1 1326033 2

3 Po 0 1326568 4s' 6 P3 3 1 549235 +y

3d' 3 F2 2s 2p2

( 4 P)3d 3d 3 F 2 1333173 942

1213

2s 2p2

(

4 P)4p 4p 3D° 1

3 F3 3 1334115 2

3 F4 4 1335328 4p' 3 D3 3 1579211

w *f3 2s 2p2

(

2 D)3p 3p' 3 F° 3 1850/97+ x 5d 3 p 2s2 2p(2 P°)5d 5d 3 po

0, 1,2 1597937

3d' 3 D,

3 D2

3 d3

2s 2p2

(

4 P)3d 3d 3 D 12

3

1350626

1350948

1351359

322

411

4d' 5 P3

5 P2

6 P1

2s 2p2

(

4 P) 4d 4d 6 p 3

2

1

1600167 + y 1600760 + ?/ 1601134 + ?/ -593

-374

3p' 1 D2 2s 2p2

( 2 D)3p 3p' 1 D° 2 1857681 + x 5d 1 F, 2s2 2p(2 P°)5d 5d

lp° 3 1600986 +x

3d/ 3 F 2s 2p2

(

2 D)3d 3d' 3 F 2, 3,4 1414307 4d' 3 F2 2s 2p2

(

4 P) 4d 4d 3 F 2 1604844

777

1126

3 f3 3 1605621

3d' 3 P 2s 2p2 (

2 D)3d 3d' 3 P 0, 1, 2 1420669 3 f4 4 1606747

2s 2p2

( 2 D)3d 3d' 3 D 1 6d 3 P 2s2 2p(2 P°)6d 6d 3 po

0, 1, 2 1665781

3d' 3 D2 2 1422040

3 574 D3 3 1422614 4d' 3 F 2s 2p2

(

2 D)4d 4d' 3 F 2, 3, 4 1695880

3d7 3 Sx 2s 2p2

(

2 D)3d 3d' 3 S 1 1435724 2s 2p2 (

4 P)5p 5p

3 D° 19

3d' xf3 2s 2p2

(

2 D)3d 3d' iF 3 1438863 + x 5p' 3 D3 3 1717734

3d/ 1 D2 2s 2p 2 (

2 D)3d 3d' iD 2 1439116 + z 2s 2p2

(

4 P)5d 5d

s P 19 4d !D2 2s2 2p(2 P°)4d 4d *D° 2 1 466102+

5d' 6 P3 3 1727216 +y

2s2 2p(2 P°)4d 4d 3 D° 1 2s 2p2

(

4 P) 5d 5d 3 F 2 4d 3 D2 2 1469556 864 3

3 D3 3 1470420 5d' 3F4 4 1730140

2s2 2p(2 P°)4d 4d 3 P° 0

12

2s 2p2

(

4 P) 6d 6d sp 19 4d 3 P2 1472144 6d' fi p3 3 1795347 +y

4d 1F3 2s2 2p(2 P°)4d

2s2 2o(' 2 P°')4d

4d iF° 3 1477931 +x

4d 1478676 +x

3 P1 4d »P° 1 Me viii ( 2 TvA Limit 1817734

March 1948. Mg vn Observed Terms*

Config.

ls2 +

Observed Terms

2s2 2p

2 {2p2 !S 2p

2 3P

2p

2 iD

2s 2

p

3 [2p3 2p3 5S°

3 S° 2p

3 sp°

2

p

3 iP°

2p

3 3 D°

2pz iD°

ns (n> 3) np (n> 3) nd (n> 3)

2s2 2p(2 P°)nx

{

3s

3s

3 po

ipo

3p

3 P 3-6d

3, 4d

3 p°

ipo

3, 4d 3 D°

3, 4d 1 D°

3d 3 F°

3-5d *F°

2s 2p2 (*P)nx

{

3, 4s

3s sp

3 P 3p

3 S° 3p3 P° 3-5p 3 D°

3-6d

3d

sp

3 P

3d 5 D

3d 3 D 3-5d 3 F

2s 2p2

( 2 D)nx'

{

3s' 3 D

3s' iD

3p' 3 D°

3p' 1 D° 3p' ! F°

3d' 3 S 3d' sp 3d' 3 D

3d' iD

3, 4d' 3 F

3d' »F

1 *For predicted terms in the spectra of the Ci isoelectronic sequence, see Introduction.
119

Mg Yin

(B i sequence; 5 electrons) Z= 12

Ground state Is2 2s2 2p

2P^

2p

2P^ 2145679 cm-1

I. P. 265.957 volts

The analysis is by Soderqvist, who has classified 118 lines, all but 9 of which lie between 52A

and 97 A. He remarks that the term values of 2p3 2P° and 2p3 2D° need further confirmation,

since no combination of these terms with the doublets of the 2p

2 configuration have been observed. These two terms and those calculated from combinations with them may require a

slight adjustment but they are not seriously in error, as compared with the errors of measurement. Apparently the values extrapolated from the law of irregular doublets and those obtained from observed combinations confirm the terms fairly well. The absolute values of the doublet terms are well determined from the nd 2D series and

nd 2F° series, both of which extend to n=5.

The absolute values of the quartet terms are obtained from the nd 4D° series {n= 3, 4, 5).

No intersystem combinations have been observed, and a small correction x may be needed to connect the doublet and quartet terms.

REFERENCE

J. Soderqvist, Ark. Mat. Astr. Fys. (Stockholm) 30A, No. 11, p. 13 (1944). (I P) (T) (C L)

Mg viii Mg vra

Author Config. Desig. J Level Interval Author Config. Desig. J Level Interval

2V

2 Pi 2s2

(

1 S)2p 2P

2 po Z 0 3304

3p' 2 SX 2s 2p(3 P°)3p 3p 2 S X 1460911

2P2 1 Z 3304

2s 2p(3 P°)3d 3d 4D° /

2p' 4 Pj 2s 2p2 2p

2 4p X 130598+2 1165

1718

3d' 4 L)2 1/ 1476964+x 377 4 P2 iz 131763+2 4 D3 2/2 1477341 +x 841 4 P3 2y2 133481+2 4 D4 3/2 1478182+x

2p' 2 d3 2s 2p

2 2p2 2 D 2y2 232281 -23 3d' 2 D2 2s 2p(3 P°)3d 3d 2 D° 1/ 1478358 348 2 D2 IX 232304 2 D3 2/ 1478706

2p' 2 St 2s 2p

2 2p2 2 S X 298283 3d' 4 P3 2s 2p(3P°)3d 3d 4 po 2/ 1484449 +x — 704

4 P2 I /2 1485153+x -486

2p' 2 P1 2s 2p

2 2p2 2 p X 318747 19954 P1 / 1485639+x

2 P2 1 X 320742

/ /

2p" 4& 2p

3 2p3 4 g UZ ° i X 414380+

3? 2 P 2s 2p( 1 P°)3s 3s' 2 po

}

i486995

2p" 2 d3 2p* 2p

3 2D° 2/4 465598 -140 3d' 2 F3 2s 2p(3 P°)3d 3d 2 po 2/2 1504992 2051

2 D2 1 X 465738 2 f4 3/ 1507043

2p" 2 P1 2p

3 2p

3 2 po X 524339 147 3d' 2 P2 2s 2p(3 P°)3d 3d 2 po

1/2 1513099 -1167 2 P2 l X 524486 2 P1 z 1514366

3s 2 Sx 2s2 (iS) 3s 3s 2 S x 1210689 w 2 D2 2s 2p(1 P°)3p 3p' 2 D 1/2 1548027 824

2 d3 2/2 1548851

3d 2 D2 2s2

(

1 S)3d 3d 2 D IX 1335863

2 170 d3 2y2 1336033 3P'

2 P, 2s 2p( 1 P°)3p 3p' 2 P z 1549955 609

2 P2 1/2 1550564

3s' 4 P1 2s 2p(3 P°)3s 3s 4po z 1352123 +2 1156

2017

4 P2 1/2 1353279 +2 3p' 2 Sx 2s 2p( 1 P°)3p 3p' 2 S z 1556517

3s'

4 p3 2/ 1355296 +2

3s" 4 P, 2p2

(

3 P)3s 3s" 4 P z 1588737+x 1228

2 P1 2s 2p(3 P°)3s 3s 2 po X 1381466 2265

4 P2 1/2 1589965+x 2008 2 P2 1/2 1383731 4 P3 2Z 1591973+a:

3p' 2 P1

2P2 2s 2p(3 P°)3p 3P

2 P X

1 X

1408371

1409401 1030 3d7 2 p 2s 2p(1 P°)3d 3d' 2 po / 2/2

t 3Z |

1597469

3V'

2 d2 2s 2p(3 P°)3p 3p 2 D 1/2 1440561 2275 3d7 2 D2 2s 2p(1 P°)3d 3d' 2D° 1Z 1607872

2 D3 2% 1442836 2 d3 2/2 1608224
120

Mg VIII—Continued Mg VIII

Continued

Author Config. Desig. J Level Interval Author Config. Desig. / Level Interval

3d7 2 P 2s 2p(1 P°)3d 3d' 2 P° / K

UH diodds 2s 2p(3 P°)4s 4s 4 po /2 1 /

4s' 4 P3 2/2 1769549 +x

3s77 2 D 2p2

(

1 D)3s 3s'" 2 D

/ 1 X

12X

} 1638646

4p' 2 P2 2s 2p(3 P°)4p 4p 2 P /2 1/2 1814176

2p2

( 3 P)3p 3p" 4 D° X

1 X 2s 2p(3 P°)4p 4p

2 D 1/

2/2 4p' 2 D3 2/ 1825262

3p" 4 D4 3/2 1647050 +x

4s 2 Si 2s2

(

1 S)4s 4s 2 S X 1647879 4d' 2 D 2s 2p(3 P°)4d Id 2 D0 /

1 /

12/2 | 1837649

2p2

( 3 P) 3p 3p" 4 P° X f H 1 1 X 4d' 4 D 2s 2p(3 P°)4d 4d 4 D° ^ to D<?m>77+x

3p" 4 P3 2/ 1658061 +x 1 31/2 1 3p" 4 S2 2p2

(

3 P)3p 3p" 4 S° 1 X 1674774+x

[ >

/2 ]

/ 2/

13/

4d' 4 P 2s 2p(3 P°)4d 4d 4 po to 3p" 2 F 2p2

(

4 D)3p 3p'" 2 F°

|

1691070 [ 2/2 1 4d' 2 F3 2s 2p(3 P°)4d 4d 2 p° 2/2 1846146 1879 4d 2 D2 2s2

(

1 S)4d 4d 2 D 1/2 1693824

11

2 F4 3/2 1848025

2 d3 2/ 1693835

5d 2 D2 2s 2

(

1 S)5d 5d 2 D 1/2 1858322 97 2p2

( 3 P) 3d 3d" 2 F 2/ 2 d3 2/ 1858419

3d" 2F4 3/ 1701860

3d" 2 D 2p2

(

3 P)3d 3d" 2 D

/I /2

l 2/2 } 1703243?

id7 2 F 2s 2p( 1 P°)4d 4d' 2 po I 2X

13/2 | 19643031

{ IX

12X

4

7 2 D 2s 2p( 1 P°)4d 4d' 2 D° ; ih

12/2

f ^

< to

\ 1968694?

3p" 2 D 2p2

(

4 D)3p 3p'" 2 D° \ 1708860 J

3d" 4 P3 2p2

(

3P) 3d 3d" 4 P 2 X 1716667 +x -814

-442

5d' 4 D 2s 2p(3 P°)5d 5d 4 D° \ 2002221 +x

4 p2 I /2 1717481 +x [ 3/2 1 4 Pi / 1717923+x

5d' 2 F3 2s 2p(3 P°)5d 5d 2 p° 2/ 2005261 1391 3d77 2 D 2p2

(

1 D)3d 3d'" 2 D / 134 12X

} 1733744

2 F4 3/ 2006652

2p2

( 3 P)4p 4p" 4 D° X

3d77 2 F 2p2 (

1 D)3d 3d'" 2 F / 2/4 13/ }l751987 1 X

2/2 3d77 2 P4 2p2

(

1 D)3d 3d'" 2 P 1754593 965

4p" 4 D4 3x 2048060 4-

/

2 p2 1/ 1755558

Mg ix (iSo) Limit 2145679

October 1946. Mg VIII Observed Terms*

Config.

ls2 +

Observed Terms

2s2

(

1 S) 2p 2p

2 P°

2s 2p2 { 2

p

2 2 S 2p2 4 P

2p2 2 P 2p2 2 D

2p

3 |

2p3 4 S° 2p3 2 P° 2p

3 2 D°

ns (n> 3) np (n > 3) nd (n> 3)

2s2

(

4 S)nx 3,4s 2 S 3-5d 2 D

2s 2p(3 P°)nx

{

3,4s 4 P°

3s 2 P° 3p 2 S 3, 4p 2 P 3, 4p 2 D

3, 4d

3d

4 P° 3-5d

2 P° 3, 4

4 D°

2D° 3-5d 2 F°

2s 2p(x P

0)nx' 3s' 2 P° 3p' 2 S 3p' 2 P 3p' 2 D 3d' 2 P° 3, 4d' 2 D0 3, 4d' 2 F°

2p2

(

3 P)nx"

{

3s" 4 P 3p" 4 S° 3p" 4 P° 3, 4p" 4 D° 3d" 4 P

3d" 2 D 3d" 2 F

2p2

(

1 D)nx'" 3s'" 2 D 3p'" 2 D° 3p'" 2 F° 3d"' 2 P 3d'" 2 D 3d'" 2 F

*For predicted terms in the spectra of the Bi isoelectronic sequence, see Introduction.
(Be i sequence; 4 electrons) Z=12

Ground state Is2 2s2

2s2 X S0 2645444 cm"1 I. P. 327.90 volts

Sixty-five lines have been classified by Soderqvist. All but three lie in the range between

46 A and 91 A. No intersystem combinations are known, but the absolute term values are determined from series that are fairly well established. The relative uncertainty, x, is probably

a few hundred cm-1. REFERENCE

J. Soderqvist, Ark. Mat. Astr. Fys. (Stockholm) 30A, No. 11 p. 8 (1944). (I P) (T) (C L)

Mg ix

Author Config. Desig.

2s XS0 2s2 2s2 »S

2p

3 P0

3 Pi

3 P2

2s( 2 S) 2p 2p 3 P°

2p

iP, 2s(2 S)2p 2p iP°

2

p' 3 P0

3 Pj

3 P2

2p

2 2p2 3 P

2

p' iD2 2p

2 2p2 iD

2p' >So 2p2 2p2 iS

3s 3 Sj 2s(2 S)3s 3s 3 S

3s J S0 2s(2 S)3s 3s *S

3v

x Pi 2s(2 S)3p 3p iP°

3 d

3 Dj

3 D2

3 d3

2s( 2 S)3d 3d 3 D

3d *D2 2s(2 S)3d 3d

3s' 3 P0 3 Pi

3 P2

2p(2 P°)3s 3s 3 P°

3s' ip

x 2p(2 P°)3s 3s J P°

3

p' *P, 2p(2 P°)3p 3p *P

3

p' 3 Di

3 D2

3 d3

2p(2 P°)3p 3p 3 D

3

p' 3 S! 2p(2 P°)3p 3p 3 S

3p' 3 P0

3 Pi

3 P2

2p( 2 P°)3p 3p 3 P

3d' iD2 2p(2 P°)3d 3d 1 D°

3

p' iD2 2p(2 P°)3p 3p

X D

3d' 3 D,

3 D2 3 d3

2p(2 P°)3d 3d 3 D°

Mg ix

J Level Interval Author Config. Desig. Level Interval

0 0 3d' 3 P2 2p(2 P°)3d 3d 3p° 2 1815552+

3 982

Pi 1 1816584+x -528

0 140786 +x 1162

2472

3 Po 0 1817062+x

1 141948+x

2 1 44420 +x 3d' x f3 2p(2 P°)3d 3d ip° 3 1884887

1 271687 3d' x Pi 2p(2 P°)3d 3d ipo 1 1841286

0 366194+2 1299

2157

4p

x Pi 2s(2 S)4p 4p

ipo 1 2068680

1 367493+2

2 369650+2 4d 3 D] 2s(2 S)4d 4d

3 D 1 2080274+2 54

50

3 D2 2 2080328+2

2 404744 3 d3 3 2080378+2

0 499444 4d x d2 2s(2 S)4d 4d J D 2 2087888

1 1532749+2 2p(2 P°)4p 4p 3 D 19 0 1558076 4p' 3 d3 3 2230056+2

1 1598600 2p(2 P°)4p 4p 3 P 0

1 1 1631321+2 163

168

4p' 3 P2 2 2235683

2 1631484+2

3 1631652+2 4d' *d2 2p(2 P°)4d 4d iD° 2 2240853

2 1654583 4p' x d2 2p(2 P°)4p 4p iD 2 2241083

0 1710478+x 1094

2533

2p(2 P°)4d 4d 3D° 1

1 1711572+x 2 2 1714105+x 4d' 3 d3 3 2248572+

1 1742772 4d' 3 P2 2p(2 P°)4d 4d 3p° 2

1 2249778 +

1 1748116 0

1 1755785+2 1018

2500

4d' x f3 2p(2 P°)4d 4d ipo 3 2256219

2 1756803+2

3 1759303+2 4d' *P1 2p(2 P°)4d 4d ipo 1 2258119

1 1770688+a; 5d 3 D 2s(2 S)5d 5d

3 D 1,2,3 2285243+x

0 1777886+2 1117

1312

5d *d2 2s(2 S)5d 5d !D 2 2288385

1 1779003+2

2 1780315+2 5d' 3 D, 3 P 2p(2 P°)5d 5d 3 F °,3D° 0 to 3 2451942+x

2 1789287 5d' j f3 2p(2 P°)5d 5d

ipo 3 2454176

2 1795868

1 1807694+x 493

995

Mg x (

2 S*) Limit 2645444

2 1808187+x

3 1 809182 +

May 1946.
Mg ix Observed Terms*

Config.

ls2 +

Observed Terms

2s2

2s ( 2 S) 2p

2p2

2s2 X S

/ 2p

3 P°

\ 2

p

ip°

/ 2p

2 3 P

12p

2 iS 2p

2 iD

ns (n> 3) np (w> 3) nd (n> 3)

(3s 3 S 3-5d 3 D

2s(2 S)nx

1.3s iS 3, 4p

iP° 3-5d X D

2p(2 P°)nx / 3s 3 P° 3p 3 S 3, 4p

3 P 3, 4p 3 D 3-5d

3 P° 3-5d 3 D°

l 3s *P° Sp l P 3, 4p !D 3, 4d X P° 3, M X D° 3-5d X F°

*For predicted terms in the spectra of the Be i isoelectronic sequence, see Introduction.

Mg x

(Li i sequence; 3 electrons) Z= 12

Ground state Is2 2s 2S^

2s 2S^ 2963810 cm'1

• I. P. 367.36 volts

The present analysis results from the classification of nine lines in the region 65 A to 44 A.

The transition 2s 2S—2p 2P° has not been reported. The predicted positions of these lines are at 625 A and 609 A.

Some of the relative levels have been connected by a study of the Rydberg denominators

in the isoelectronic sequence rather than by the Ritz combination principle.

REFERENCE

J. Sdderqvist, Ark. Mat. Astr. Fys. (Stockholm) 30A, No. 11, p. 3 (1944). (I P) (T) (C L)
123

Mg x

In- Author Config. Desig. J Level ter- val

2s 2 Si 2s 2s 2 S X 0

2p

2 Pi 2V 2p

2 P° % 159929

2 4047 P2 i X 168976

3s 2 Sj 3s 3s 2 S K 1682648

3v

2 Pi 3p 3v

2 P° X 1726519

2 1313 P2 i X 1727832

3d 2 D2 3d 3d 2 D 1/2 1743410

2 470

E>3 2/2 1743880

4v

2 P2 ,i 4p 4p 2 P° J X

i l x }

2270148

4d 2 D2 4d 4d 2 D l X 2277182

2 512 D3 2X 2277694 —Mg xi OSo) Limit 2963810

May 1946. Mg xi

(He i sequence; 2 electrons) Z=12

Ground state Is2 X S0

Is2 % 14209200 ±2500 cm"1 I. P. 1761.23 ±0.31 volts

Flemberg has observed the four leading lines in this spectrum; they He between 7 A and

9 A. He has calculated absolute term values on the assumption that the P-terms can be represented by a Ritz formula. The fourth line appeared on only one plate and was not used in the

calculation of the limit.

The unit adopted by Flemberg, 103 cm"1

, has here been changed to cm"1

. REFERENCE

H. Flemberg, Ark. Mat. Astr. Fys. (Stockholm) 28A, No. 18, p. 34 (1942). (I P) (T) (C L)

Mg xi

Config. Desig. J Level

Is2 Is2 iS 0 0

Is 2p 2p

iP 0 1 10907300

Is 3p 3p

ip° 1 12788400

Is 4p 4p iP0 1 13381100

Is 5p 5p iP0 1 13680600

Mg xii (

2 SH) Limit --- 14209200

October 1946.
124

ALUMINUM

All

13 electrons Z=13

Ground state Is2 2s2 2p6 3s

2 3p 2Py2

3p

2Py2 48279.16 cm-1

I. P. 5.984 volts

The earlier analysis has been extended by Paschen and Ritschl, who have derived improved

term values and extended the observations in the infrared and ultraviolet.

The terms 3p

2 2 P and 3p2 2S have been suggested by Bowen and Millikan and by Selwyn,

respectively. The only combinations are with 3p

2P°.

Paschen discusses the possibility that the term here called 3d

2D may be 3p2 2D, in which

case all subsequent members of the 2D series must have n decreased by one unit.

Intersystem combinations connecting the doublet and quartet terms have been observed.

REFERENCES

A. Fowler, Report on Series in Line Spectra, p. 156 (Fleetway Press, London, 1922). (T) (C L)

I. S. Bowen and R. A. MilKkan, Phys. Rev. 26, 160 (1925). (C L)

E. W. H. Selwyn, Proc. Phys. Soc. (London) 41, Part 4, No. 229, 402 (1929). (C L)

F. Paschen, Ann. der Phys. [5] 12, 516 (1932). (T) (C L)

F. Paschen und R. Ritschl, Ann. der Phys. [5] 18, 886 (1933). (I P) (T) (C L)

W. F. Meggers, J. Opt. Soc. Am. 36, 431 (1946). (Summary hfs)

A1 1 A1

Config. Desig. J Level Interval Config. Desig. J Level Interval

3s2 0S)3p 3p 2P° K 0. 00

112. 04 3s2

(

x S)4d 4d 2 D IK 38929. 42

4. 54

IK 112. 04 2K 38933. 96

3s2

(

x S)4s 4s 2 S K 25347. 69 3s2 OS) 5p 5p

2 P° K 40271. 98

5. 94

IK 40277. 92

3s 3p2 3p

2 4 P K 29020. 32

46. 58

75. 78 IK

2K

29066. 90

29142. 68 3s2

(

x S)4/ 4/ 2 F° / 2K

l 3K } 41818. 74

3s2 (iS) 3d 3d 2 D IK

2y2 32435. 45

32436. 79 1. 34 3s2 OS) 6s 6s 2 S K 42144. 84

3s 2 0S)5d 5d 2 D IK 42233. 72

3. 99

3s2

(

x S)4p 4p2 P° K

IK

82949. 84

82965. 67 15. 83 2K 42237. 71

3s2 OS) 6p 6p

2 P° K

IK

43834. 95

2. 82

3s2 (iS) 5s 5s 2 S K 37689. 32 48337. 77
125

A1 1—Continued A1 1—Continued

Config. Desig. J Level Interval Config. Desig. J Level Interval

3s2 OS) 5/ 5/

2 F° f 2Z

l 3Z |

4SSSL 08 3s 3

p

2 3p2 2 S y2 51753. 0?

3s 3p2 3p2 2 P y2 56643. 0?

84. 3

3s2

(

x S)6d 6d 2 D 1 Z

2z

44166. 48

44168. 88 2. 40 iy2 56727. 3?

3s 3p(*P°)4s 4s 4 P° y2 61691. 29

56. 09

96. 03 3s2 OS) 7s 7s 2 S z 44273. 16 1/ 61747. 88

2/ 61843. 41

3s2 0S) 7p 7v

2 P° z U928. 4 2. 0

i Z 44980. 4 3s 3p(3 P°)3d 3d 2 D° 1/2 67685. 8

27. 9

f 2H

l 3Z

2/ 67668. 2

3s2

(

x S)6/ 6/ 2 F°

j 45194- 65

3s 3p(*P°)3d 3d 2 P° 1/2X

71184- 7?

71260. 7 -76. 0

3s2

(

1 S)7d 7d 2 D iy2 45344. 16

1. 44

2H 45345. 60

45457. 27

3s 3p(3P°)3d 3d 4 D° y2 1 X

71285. 63

71244- 88 8. 75

16. 40

25. 49 3s2 (

x S)8s 8s 2 S Z 2/ 71260. 78

f 2K

l 3/2

3/ 71286. 27

3s2 (

x S)7/ 7f

2jr° | 46015. 78

3s 3p(3 P°)3d 3d X P° 2 / 72203. 77 46 52

3s2 (*S)8d 8d

2 D 1/2 2/

46093. 9

46094. 27 0. 4

1/2/

72250. 29

72277. 68 -27.39

3s 3p(3 P°)5s 5s 2 P° / 72979. 0

98. 9

3s2 OS) 9s 9s 2 S Z 46184. 5 1/2 78077. 9

3s2 0S)9d 9d 2 D 1/ 46593. 28

0. 55 3s 3p(3 P°)4d 4d 2 P° z 76521. 831. 9 2/ 46593. 83 1/2 76558. 7

3s2 OS) 10s 10s 2 S 46665. 7 3s 3p(3 P°)6s 6s 2 P° z 78612. 5

98. 0

/ I/

l 2/

1/2 78710. 5

3s2 (

1 S)10d lOd 2 D

} 46942.

3

3s 3p(3P°)5d 5d 2 F° 2/ 80158. 0

33. 9

3s2 (

1 S)lld

A1 ii OS0)

lid 2 D

Limit

; 1/2

l 2/2 | 47192.

0

48279. 16

3/ 80191. 9

August 1947.

All Observed Terms*

Config.

Is2 2s2 2ps+ Observed Terms

3s2 0S)3p 3p 2 P°

3s 3p2 / 3p2 4 P

\ 3p2 2 S? 3p2 2 P?

ns (n> 4) np (n>4) nd (n> 3) nf (n> 4)

3s2 0S)nz 4-10s 2 S 4-7p 2 P° 3-1 Id 2 D 4-7/ 2 F°

3s 3p0P°)tt£ / 4s 4 P°

\ 5, 6s 2 P°

3d *P° 3d X D°

3, 4d 2 P° 3d 2 D° 5d 2 F°

*For predicted terms in the spectra of the A1 1 isoelectronic sequence, see Introduction.
126

A1 II

(Mg i sequence; 12 electrons) Z= 13

Ground state Is2 2s2 2p

6 3s2 X S0

3s2 X S0 151860. 4 ± 0.5 cm"1 I. P. 18.823 volts

Sawyer and Paschen published a detailed analysis in 1927, from which most of the terms

have been taken. Since then some revisions and extensions have been made, especially re- garding the terms from the 2P° limit in A1 hi. The spectrum of A1 ii furnishes an excellent

illustration of perturbed series and consequently is discussed in a number of theoretical papers on this subject. For example, Shenstone and Russell remark that one of the two lowest X D

terms should be 3p2 X D. In accordance with their suggestions the terms labeled by Sawyer

and Paschen 3

2 D, 73F, and 12 XP are here designated 3^2 X D, 3d

3F°, and 4s 1P°?, respectively.

These changes cause a decrease of one unit in the published values of n for all following series

members in each of the three series. In the 1927 paper the higher series members of the 3P and 3 D series are assigned the Jvalues of the leading components (2 and 3, respectively). As the term intervals are known to be small, all three J-values for each term are entered in the table on the assumption that the

terms are unresolved.

In 1933 Paschen and Ritschl published the detailed hyperfine structure separations they

observed for a number of the components of triplet terms. From this paper the three new

H-terms have been taken, and also slightly improved values of the terms 4s :S, 6s 3 S, 8p

3 P°,

5/ x F°, and 5# 1,3G. It has been assumed that the singlet and triplet G-terms and also the

singlet and triplet H-terms are coincident, since no multiplicities are assigned to them. Van

Vleck and Whitelaw give the theoretical explanation of this for the G-terms.

Intersystem combinations connecting the singlet and triplet systems of terms have been

observed.

REFERENCES

R. A. Sawyer und F. Paschen, Ann. der Phys. [4] 84, 1 (1927). (I P) (T) (C L)

F. Paschen, Ann. der Phys. [5] 12, 509 (1932). (T) (C L) A. G. Shenstone and H. N. Russell, Phys. Rev. 39, 427 (1932). (T) F. Paschen und R. Ritschl, Ann. der Phys. [5] 18, 872 (1933). (T) (C L) (hfs)

J. H. Van Vleck and N. G. Whitelaw, Phys. Rev. 44, 551 (1933).

W. F. Meggers, J. Opt. Soc. Am. 36, 431 (1946). (Summary hfs)

A1 II A1 II

Config. Desig. J Level Interval Config. Desig. J Level Interval

3s2 3s2 iS 0 0. 0 3s(2S)4p 4p

3 P° 0 105424- 8

14 1

1 105488. 4 29. 3

3s(2 S)3p 3p

3 P° 0 87392. 0 fil 8 2 105467. 7

1 87458. 8

125. 5 4v 2 87579. 8 3s(2 S)4p X P° 1 106918. 2

3s(2 S)3p 3p

X P° 1 59849. 7 3s ( 2 S) 3d 3d »D 2 110087. 5

CO e

M 3p2 *D 2 85479. 0 3s(2 S)5s 5s 3 S 1 120089. 8

3s(2S)4s 4s 3 S 1 91271. 2 3s(2S)5s 5s J S 0 121365. 2

3p

2 3p2 3 P 0 94084. 5

62. 3

120. 9

3s(2S)4d 4d 3 D 3 121480. 3 0 6

1 94146. 8 2 121480. 9 -0. 3 2 94267. 7 1 121481. 2

3s(2 S)4s 4s J S 0 95348. 2 3s(2 S)4/ 4/ 3 F° 2 123415. 9

2 1 3 128418. 0 2.8

3s(2S)3d 3d 3 D 3295546. 8

95547. 9 -1. 1 -0. 9

4 128420. 8

1 95548. 8 3s(2 S)4/ 4f iF° 3 123468. 1
AI II—Continued A1 II

Continued

127

Config. Desig. J Level Interval Config. Desig. J Level Interval

3s(2S)4d 4d *D 2 124792. 0 3s(2S)9s 9s 3 S 1 144524. 3

3s(2S)5p 5p 3 P° 0 125700. 5

5 7

3s(2 S)8d 8d 3 D 3, 2,1 144638. 9

1 125706. 2

2 125719. 0

1Z. 0

3s(2 S)9s 9s !S 0 144641. 9

3s(2 S)5p 5p !P° 1 125866. 7 3s(2 S)8d 8d *D 2 144780. 2

3s(2 S)6s 6s 3 S 1 132213. 2 3s(2 S)8/ 8/ !F° 3 144781. 9

3s(2 S)6s 6s »S 0 132776. 4 3s(2 S)9p 9p

iP° 1 144939. 1

3s(2 S)5d 5d 3 D 3 132819. 7 n 2

3s(2 S)8<7 8g

3 G 3, 4, 5 144964. 7

2, 1 132819. 9

3s(2 S) 8<7 8g *G 4 144964. 7

3s(2 S)5/ 5/ 3 F° 2 133435. 0

5 4

3 133440. 4 6 9

3s (

2 S) 8/1 8h 3H° 4, 5,6 144990. 0

4 133447. 3

3s(2 S)8/i 8h >H° 5 144990. 0

3s(2 S)5/ 5/ 1 F° 3 133679. 3

3s(2 S)8/ 8/ 3 F° 2 145126. 5

3s(2 S)5d 5d X D 2 133914. 1 3 145128. 9 ft 9 4 145132. 1 0. z

3s(2 S)5</ 5g 3 G 3, 4, 5 134181. 2 3p(2 P°)3d 3d 3 D° 1,2 145148

3s(2 S)5<7 % J G 4 134181. 2 3 145152

3s(2S)6p 6p iP° 1 134917. 3 3s(2 S)9p 9p

3 P° 0, 1,2 145185?

3s(2S)6p 6p

3 P° 0 135009. 0

3 1 3p(2 P°)4s 4s 3 P° 0 145773. 9 r;s 7

1 135012. 1 6 8

1 145832. 6 19 ft 2 135018. 9 2 145959. 4

3s(2S)7s 7s 3 S 1 138496. 7 3s(2 S)10s 10s 3 S 1 146108. 8

3s(2 S)6/ 6/ 3 F° 2 138518. 7 1 7 7

3s(2 S)9d 9d 3 D 3, 2, 1 146185. 0

3 138536. 4 99 O 4 138559. 2

ZZ. 5

3s(2 S)10s 10s iS 0 146190. 1

3s(2 S)7s 7s iS 0 138799. 3 3s ( 2 S) 9d 9d !D 2 146274. 4

3s(2 S)6d 6d 3 D 3, 2,1 138811. 9 3s(2 S)9/ 9/ J F° 3 146276. 5

3s(2 S)6/ 6/ !F° 3 139242. 9 3s(2 S)10p lOp 1 P° 1 146297. 5

3s(2 S)6d 6d iD 2 139286. 8 3s(2 S)9g 9<7 3 G 3, 4,5 146414. 5

3s(2 S)6<7 6<7 3 G 3, 4,5 139588. 7 3s(2 S)9<7 9g

3 G 4 146414. 5

3s(2 S)6<7 6<7

3 G 4 139588. 7 3s(2 S)9/t 9h 3 H° 4, 5,6 146432. 8

3s(2 S) 7p 7p

iP° 1 139916. 7 3s(2 S)9/i 9h

1 H° 5 146432. 8

3s ( 2S) 7p 7p 3 P° 0, 1,2 140091. 2 3s(2 S)9/ 9/ 3 F° 2 146496. 7

3 146497. 8

1 4 3p(2 P°)3d 3d 3 F° 2 141082. 4 25 1 4 146499. 2

3 141107. 5 n 4 141140. 5 3s(2 S)10p lOp 3 P° 0, 1, 2 1465771

3s(2 S)8s 8s 3 S 1 142179. 8 3p(2 P°)3d 3d 3 P° 0 146595. 01

1 9

1 146596. 9

2 4

3s(2S)8s 8s J S 0 142360. 8 2 146599. 3

3s(2 S)7d 7d

3 D 3, 2,1 142362. 8 3s(2 S)lls 11s 3 S 1 147229. 0

3s(2 S)7/ 7/ J F° 3 142601. 6 3s(2 S)llp lip »P° 1 147268. 8

3s(2 S)7d 7d iD 2 142607. 0 3s(2 S)10d lOd 3 D 3, 2, 1 147282. 8

3s (

2S) 7<j 7g 3 G 3, 4,5 142849. 2 3s(2 S)lls 11s J S 0 147288. 8

3s(2 S)7g 7g 'G 4 142849. 2 3s(2 S)10d 10d !D 2 147343. 2

3s ( 2S) 8p 8p »P° 1 142958. 9 3s(2 S) 10/ 10/ 1 F° 3 147344• 2

3s(2S)8p 8p

3 P° 0, 1, 2 148170. 0 3s(2S)10£ 10g3 G 3, 4,5 147451. 0

3s(2S)7/ 7p F° 2 143262. 7 7 1 3s(2 S)10</ 10^ *G 4 147451. 0

3 143269. 8 in ft 4 143280. 6 3s(2 S)10ft lO/i 3H° 4, 5,6 147464. 7
128

A1 II

Continued A1 II

Continued

Config. Desig. J Level Interval Config. Desig. J Level

3s(2 S)10ft 10h m° 5 147464- 7 3s (

2 S) 13/ 13/ X F° 3 149199. 2

3s(2S)10/ 10/ 3 F° 2 147499. 8

0. 4

0. 6

3s(2 S)13<7 13<7 3 G 3, 4,5 149252. 9

3 147500. 2

3s(2 4 147500. 8 S)13<7 13<7 x G 4 149252. 9

3s(2 S)llp lip 3 P° 0, 1,2 147572? 3s(2 S)13/ 13/ 3 F° 2, 3,4 149269. 5

3p(2 P°)4s? 4s iP° 1 148002. 0 3s(2 S)14p 14p ip° 1 149434. 8

3s(2 S)12s 12s 3 S 1 148052. 5 3s(2 S)15s 15s »S 0 149554. 7

3s(2 S)lld lid 3 D 3, 2,1 148090. 0 3s(2 S)14/ 14/ !F° 3 149568. 6

3s(2 S)12s 12s X S 0 148097. 1 3s(2 S)14/ 14/ 3 F° 2, 3,4 149625. 5

3s(2 S)ll/ 11/ 1 F° 3 148132. 6 3s(2 S)15p 15p iP° 1 149748. 0

3s(2 S)lld lid X D 2 148132. 7 3s(2 S)16s 16s iS 0 149856. 6

3s(2S)11<7 11^ 3 G 3, 4,5 148217. 6 3s(2 S)15/ 15/ iF° 3 149866. 2

3s(2 S)11<7 11 g

X G 4 148217. 6 3s(2 S)15/ 15/ 3 F° 2, 3,4 149913. 2

3s(2 S)ll/ 11/ 3 F° 2 148248. 7

0. 4

0. 5

3s(2 S) 16p 16p ip° 1 150007. 6

3 148249. 1 4 148249. 6 3s(2 S)16/ 16/ !F° 3 150109. 7

3s(2 S)12p 12p X P° 1 148579. 4 3s(2 S)16/ 16/ 3 F° 2, 3,4 150148. 4

3s(2 S)13s 13s 3 S 1 148673. 7 3s(2 S)17/ 17/ !F0 3 150311. 1

3s(2 S)13s 13s »S 0 148706. 9 3s(2 S)17/ 17/ 3F° 2, 3,4 150343. 5

3s(2S)12/ 12/ 1 F° 3 148731. 6 3s(2 S)18/ 18/ 1 F° 3 150479. 7

3s(2S)12<7 12g

3 G 3, 4,5 148800. 4 3s(2 S)19/ 19/ 1 F° 3 150622. 2

3s(2S)12gr

3s(2 S)12/

3s(2 S)13p

3s(2 S)14s

12g

X G

12/ 3 F°

13p iP°

14s »S

4

2, 3,4

1

148800. 4

148822. 5

149051. 9

149179. 8

3s(2 S)20/ 20/ !F° 3 150744- 1

A1 hi (

2S*) Limit 151860. 4

0

Interval

July 1947. A1 ii Observed Terms*

Config.

Is2 2s2 2p8 +

Observed Terms

3s2

3s(2 S)3p

3p2

3s2 iS

f 3p 3 P°

\ 3p

J P°

/ 3p2

P

\ 3p2 !D

ns (n> 4) np (n> 4) nd (n> 3)

/4^13s 3 S 4-1 lp 3 P° 3-1 Id 3 D

3s(2 S)nx \4-16s iS 4-1 6p iP0 3-1 Id X D

/ 4s 3 P° 3d 3 P° 3d 3 D° 3d 3 F°

3p(2 P°)nx

{ 4s ip°?

nf (n> 4) ng (n> 5) nh (n> 6)

3s(2 S)ra; /4-17/ 3 F°

14-20/ J F°

5-13^ 3 G

5-13^ X G

8-10fc 3H°

8-10fc 1 H°

For predicted terms in the spectra of the Mg i isoelectronic sequence, see Introduction.
129

A1 m

(Na i sequence; 11 electrons) Z— 13

Ground state Is2 2s2 2p6 3s 2S^

3s 2Sh 229453.99 cm-1

I. P. 28.44 volts

The analysis is by Paschen. Three terms, 6s 2S, 7s 2S and 7p

2P° are from the paper by

Ekefors, who extended the observations in the ultra-violet to 486 A.

REFERENCES

F. Paschen, Ann. der Phys. [5] 71, 148 (1923) and unpublished material. (I P) (T) (C L)

E. Ekefors, Zeit. Phys. 51, 471 (1928). (T) (C L)

A1 hi A1 m

Config. Desig. J Level Interval Config. Desig. J Level Interval

3s 3s 2 S X 0. 00

60 60 2 G n-nt

4 } 202001. 32

3p 3p

2 P° X 53681 1 232. 5

i X 53916. 6

6h 6h 2H° / 4/

l 5/ } 202007. 32

3d 3d 2 D 2/

i X

115955. 03

115957. 31 -2. 28

7s 7s 2 S X 202904. 8

4s 4s 2 S X 126162. 58

7p 7p

2 P° { X

l 1/2 }

205360

4p 4p 2 P° X 1 43632. 25

80. 13

1/2 143712. 38

7d 7d 2 D J 2/

1 1/2 j 208880. 37

4d 4d 2 D 2/

1 X

165785. 26

165786. 54 —1. 28

7/ 7/ 2 F° / 2 /

l 3/ } 209260. 98

4/ 4/ 2F° 2/2 167612. 05

0. 38

3/2 167612. 43 70 70

2 G I 3/2

l 4/ } 209282. 17

5s 5s 2 S X 170636. 38

5p 5p

2 P° X 178430. 49 39. 15 7h 7h 2H° / 4y2 l 5/ | 209287. 52

1/2

/ 2/2 \ 1 X

178469. 64

8d 8d 2 D r 2X

1 ix \ 213741. 42

5d 5d 2D

| 188875. 52 J

5/ 5/ 2F° 2/2 189875. 34

0. 12

8/ 8/ 2F° j 2/

1 3/ | 213992. 12

3/2 189875. 46

r 3/

1 4/ 50 50 2 G ; 3/

t 4/ } 189927. 76

80 8

0

2 G

} 214010. 67

6s 6s 2 S X 191478. 5 8h 8h 2H° / 4/

t 5/ }

214015.

8

6p

6d

6p

2 P°

6d 2D

X

1/2

/ 2/

\ 1 X

195620. 94

195641. 53

| 201374. 37

20. 59 9h 9h 2H° / 4/

1 5/ }

217255.2

A1 iv /So) Limit 229453. 99

6/ 6/

2F° J 2/

l 3/2 } 201969. 52

May 1947.
130

A1 IV

(Ne i sequence; 10 electrons) Z= 13

Ground state Is2 2s2 2p

6

2p

6 ! So 967783 cm-1

I. P. 119.96 volts

The analysis has been taken from Soderqvist’s Monograph. The term designations he

assigns on the assumption of -LS-coupling are given with his notation under the heading

‘ ‘Author’ ’ in the table.

As for Ne i, the ^'/-coupling notation in the general form suggested by Racah is introduced.

Shortley has, however, pointed out that the configurations 2p

5 3s, 2p5 Sp, and 2p5 3d are much

closer to Z$-coupling than to jY-coupling.

REFERENCES

J. Soderqvist, Nova Acta Reg. Soc. Sci. Uppsala [IV] 9, No. 7, 34 (1934). (I P) (T) (C L). G. Racah, Phys. Rev. 61, 537 (L) (1942). G. Shortley, unpublished material (1948).

A1 IV A1 IV

Author Config. Desig. J Level Author Config. Desig. J Level

2V »So 2p

6 2 iS 0 0 2p5

(

2 PfH)4s 4s [i y2 ]° 2

4s 3 Pi 1 802936

3s 3 P2 2p5

( 2 P,^)3s 3s [1H1° 2 616646. 7 2p5

(

2 P£)4s 4s'

[ y2 ]° 0

3 Pi 1 618477. 5 4s x Pi 1 806231

3s 3 Po 2p5

(

2 P£)3s 3s' [ y2 ]° 0 619947. 7

J Pi 1 624720. 5 2p5(2 Pi*)4d 4d [ y2 ]° 0

4d

3 Pi 1 851956

3pio 3Si 2p6

(

2 P,^)3p 3P [ y2 \ 1 671635. 5 4d

x Pi // 4d [i y2]° 1 855286

3pg

3 D3 // 3P [2 y2 ] 3 680862. 9 2p5

( 2 PA)4d id' [iy2 y 2 3p8

3 d2 2 681686. 7 4d 3 D, 1 858671

3p? 3 D, // 3v [I/2] 1 682869. 3

3p8

j d2 2 685732. 8 2p 5

(

2 P,^)5s 5s [i y2]° 2

5s 3 Pi 1 871391

3ps 3 Po n

3? [ y2 ] 0 688313. 3 2p s

(

2 P£)5s 5s' [ y2)° 0

3Pb x Pi 2p3(2P °)3p 3V' [1H1 1 687456. 8 5s x Pi 1 874669

3Pi 3 P2 2 687834. 7

3p2

3 Pi // 3p' [ y2 ] 1 688653. 0 2p3(2P^)5d 5d [ y2 ]° 0

3pi iSo 0 690244. 9 5d

3 Pi 1 894614

5d

x Pi n 5d [i y2]° 1 896138

3d 3 Po 2p«(2 P!h)3d 3d [ y2]° 0 759197. 4

3 P1 1 759600. 9 2p 5

( 2 P£)5d 5d' [1H1° 2

5d

3 D, 1 899281

3d 3 P2 // 3d [l/2 ]° 2 761015. 4 3d 3F4 // 3d [3 y2 ]° 4 761694 5 6d

x Pi 2p3(2 PfH)6d 6d [i y2 ]° 1 918215

3 f3 3 762277. 1 2p 5

( 2 P£)6d 6d' [i y2]° 2 3d 3 f2 n 3d [2y2 ]° 2 76S502. 8 6d

3 D, 1 921362

i r3 3 764304- 3

3d x Pi n 3d [1 y]° 1 767040. 6

3d 3 d3 2p6

(

2 P£)3d 3d' [2y2 }° 3 767351. 9 A1 v ( 2 Pf*) Limit 967783

x d2 2 767536. 21 A1 v (

2 P£) Limit 971223

3d 3 d2 // 3df [i yy 2 767756. 1 3D, 1 770836. 1

April 1947.
A1 iv Observed Levels*

Config.

Is 2 2s2 +

Observed Terms

2 2p6 »S

ns {n> 3) np (n> 3) nd (n> 3)

2p5

(

2 P°)nx / 3—5s 3 P°

\ 3-5s iP°

3p

3 S

3p

iS 3p

3 P 3p

3 D

3p

J P 3p iD

3-5d

3 P°

3-6d !P° 3-6d

3 D°

3d hD°

o &f?o

"e

'is

CO

CO

jZ-Coupling Notation

Observed Pairs

ns (n> 3) np (n> 3) nd (n> 3)

2p5 (

2 F\H)nx 3-5s [1 y2}° 3p [ y2] 3p [234] 3P [134]

3-5d [ y2 ]° 3d [334]° 3-6d [iy2]° 3d [2y2 ]° 2p5

(

2 P&)nx' 3-5s' [ y2]° 3p' [134] 3p’ [ y2]

CO 103

CO

a.

a, o

o

*For predicted levels in the spectra of the Ne i isoelectronic sequence, see Introduction.

A1 y

(F i sequence; 9 electrons) Z=13

Ground state Is2 2s2 2p

5 2P

2pB 2P^ 1240600 cm"1 I. P. 153.77 volts

The analysis published by Soderqvist in 1934 has been extended by Ferner to include 78

classified lines in the region between 85 A and 281 A. The present list has been compiled from

unpublished material kindly furnished by Ferner.

Intersystem combinations connecting the doublet and quartet terms have been observed.

All but one of the observed combinations are with the ground term.

Ferner’s unit, 103 cm-1

, has here been changed to cm-1

. By analogy with related spectra in the isoelectronic sequence Robinson has suggested

the following changes in Ferner’s term assignments:

Ferner Robinson Ferner Robinson

3d 4 P2j^ 3d 2 D2H 3d' 2 S* 3d' 2 P1H 3d 4 Di>$

4 D2H

TbTb CO

CO 3d' 2 P1H 3d' 2 D1H

3d 2 D2H 3d 2 F2j4 3d' 2 Di* 3d' 2 S*

4d 4 Di^

4 D2*

4d 4 P1H 4d 2 D2H 3d' 2 D2H 4d' 2 Sh

3d' 2 D2^

2 F2}$ 4d' 2 FW

4d 2 D1H

2 d2H 4d 2 P^

4d 2 D1H 4d' 2 FW4d' 2 P* 2 S**

4d' 2 D

*1100620.

He has also suggested a correction of +1000 cm 1 to Ferner’s absolute term values. This

correction has been made in the limit quoted here.
132

A1 V—Continued

REFERENCES

J. Soderqvist, Nova Acta Reg. Soc. Sci. Uppsala [IV] 9, No. 7, 39 (1934). (T) (C L) E. Ferner, Ark. Mat. Astr. Fys. (Stockholm) 36A, No. 1, p. 57 (1948). (I P) (T) (C L)

H. A. Robinson, unpublished material (March 1948). (T) (C L)

A1 v A1 v

Author Config. Desig. J Level Interval Author Config. Desig. J Level Interval

2V

2 P2 2s2 2p6 2p® 2 po 1 X 0 -3440 4d 4 D3 2s2 2p4

( 3 P)4d 4d

4 D 3/

2 Pi X 8440 2/ 1062510

4 -310 d2 I /2 1062820

2p' 2 S, 2s 2

p« 2p« 2S / 358810 X

3s 4 P3 2s2 2p4

( 3 P)3s 3s 4P 2/ 751810 -2150

-1290

2s2 2p4 (

3 P)4d 4d 4 P X 4 P2

4 P1 l/2 X

753960

755250

4d 4 p2

4 p3 1/2 2/

1063650

1064050 400

3s 2 P2 2s2 2p4

(

3P)3s 3s 2 p 1/2 764240 -2550 4d 2 P, 2s2 2p4

( 3 P)4d 4d 2 p X 1065170

2 2600 P1 x 766790 2 P2 IX 1067770

3l 2 D3 2s2 2p4

(

x D)3s 3s' 2 D 2/2 796650 -30 4d 2 d2 2s2 2p4

( 3 P)4d 4d 2 D IX 1065460

2 1150 D2 1/2 796680 2 d3 2/2 1066610

3s 2 S, 2s2 2p4

(

x S)3s 3s" 2 S x 843880 4s 2 Si 2s2 2p4

(

x S)4s 4s" 2 S X 1089930

2s2 2p4 (*P)3d 3d 4 D 31/2 3s' 2 P2 2s 2p5

( 3 P°)3s 3s'" 2 po vx/

1096180 -2170 3d 4 D3 4 D2 2/2

1/2A

919900

920680 -780

2P1 1098850

4d 2 P1 2s2 2p4

(

x D)4d 4d' 2 P / 1101400

2 1980 P2 1/2 1103380

3d 4 P, 2s2 2p4

( 3P)3d 3d 4P X 921440 680

520

4 P2 IX 922120 4d 2 s, 2s2 2p4

(

x D)4d 4d' 2 S X 1102540

4P3 2y2 922640

4d 2 D3 2s2 2p4 (

x D)4d 4d' 2 D 2X 1103190

3d 2F3 2s3 2p4

(

3 P)3d 3d 2JP 3y2 2/2 923230

ix

2s2 2p4

( 3 P)5d 5d 4 D 3/2 3d j d2 2s2 2p4 (

3 P)3d 3d 2D 1/2 925430 970 5d 4 d3 2X 1127550

2 -180 D3 2V2 926400 4 D2 1/2

1/ 1127730

3d 2P1 2s2 2p4

( 3P)3d 3d 2p / 925900 2510

72

2 P2 1 x 928410 5d 2 D2 2s2 2p4 (

3 P) 5d 5d 2 D 1129350

2 1550 d3 2/2 1130900

3d 2 P1 2s2 2p4

(

x D)3d 3d' 2p X 960420 1210 2 P2 IX 961630 5d 2 P, 2s2 2p4

( 3 P)5d 5d 2 P X 1129350

2 2300 P2 1/2 1131650

3d 2 S, 2s2 2p4

(

x D)3d 3d' 2S X 960860 —

4d 2 D3 2s2 2p4

(

x S)4d 4d" 2 D 2/ 1149160 -100 3d 2 D3 2s2 2p4

(

x D)3d 3d' 2 D 2/2 962640 -6902 D2 1/ 1149260

2 d2 1/2 963330

6d 2 D2 2s2 2p4

(3 P)6d 6d 2 D 1/ 1163850 1600

4s 2 P2

2 P1 2s2 2p4

( 3 P)4s 4s 2p 1/2X

1005760

1008040 -2280

2 D3 2/ 1165450 — 5d 2Sl 2s2 2p4

(

x D)5d 5d' 2 S X 1167380

3d 2 d3 2s2 2p4 (

x S)3d 3d" 2D 2/2 1007150

2 -140 D2 1/2 1007290 2s2 2p4

(

x D)5d 5d' 2 p X

5d 2P2 1/2 1168060

48 2 d3

2 D2 2s2 2p4 (

1 D)4s 4s' 2D 2/2

1 X

1043430

1043480 -50

A1 vi (3 P2) Limit 1240600

March 1948.
133

Alv Observed Terms*

Config.

1 s

2 +

Observed Terms

2s2 2p6 2p5 2po

2s 2p® 2p« 2 S

ns (n> 3) nd (n> 3)

/ 3s 4 P 3, 4d 4 P 3-5d

4 D 2s2 2p4 (

3 P)nx

\ 3, 4s 2P 3-5d 2 P 3-6d 2 D 3d 2 F

2s2 2pi (

1 D)nx' 3, 4s' 2 D 3-5d' 2 S 3-5d' 2 P 3, 4d' 2 D

2s2 2p4 (

1 S)nx" 3, 4s" 2S 3, 4d" 2 D

2s 2p5

( 3 P°)wx'" 3s"' 2P°

*For predicted terms in the spectra of the Fi isoelectronic sequence, see Introduction.

A1 vi

(O i sequence; 8 electrons) Z=13

Ground state Is2 2s2 2p4 3P2

2^4 3P2 1536300 cm-1

I. P. 190.42 volts

The analysis is by Ferner, who has extended the earlier work by Soderqvist. He has listed

45 terms and 89 classified lines. The later observations are in the region between 68 A and

113 A. Two intersystem combinations have been observed.

Ferner expresses all level values in units of 103 cm-1 but for uniformity all values listed

below are given in cm-1

. REFERENCES

J. Soderqvist, Nova Acta Reg. Soc. Sci. Uppsala [IV] 9, No. 7, 51 (1934). (T) (C L)

E. Ferner, Ark. Mat. Astr. Fys. (Stockholm) 36A, No. 1, p. 48 (1948). (I P) (T) (C L)

A1 VI A1 VI

Config. Desig. J Level Interval Config. Desig. J Level Interval

2s2 2p4 2p4 *P 2 0 -2736

-1095

2s2 2p3

( 2P°)3s 3s" 3p° 0

102736

3831

12

993660

993880 220

2s2 2p4 2p4 iD 2 41600 2s2 2p3

( 2 P°)3s 3s" ipo 1 1008700

2s2 2p4 2p

4 iS 0 88670 2s2 2p3

( 4S°)3d 3d 3 D° 1 1079460 30

2s 2p6 2 1079490 120

2p

s 3po 2 828002 -2468

-1352

3 1079610

10

825^70

826822 2s2 2p3

( 2D°)3d 3d' 3p° 4

Q

2s 2p6 2p6 ipo 1 451840 2 1182180

2s2 2p*(4S°)3s 3s 3S° 1 918180 2s2 2p*(2 D°)3d 3d' 3 D° 3, 2,1 1184170

2s2 2p*(2 D°)3s 3s' 3 D° 3, 2,1 961100 2s2 2p3 (

2 D°)3d 3d' ipo 1 1186500

2s2 2p3 (

2D°)3s 3s' iD° 2 970790
134

A1 VI

Continued A1 VI

Continued

Config. Desig. J Level Interval Config. Desig. J Level Interval

2s2 2p3

(2 D°) 3d 3d' 3po 2 1140840 -830

-240

2s2 2p3

( 2 P°)4s 4s" ipo 1 1312070

1 1141670

0 1141910 2s2 2p3 (

2 D°)4d 4d' 3 D° 3, 2,1 1889480

2s2 2p3

(

2 D°) 3d 3d' 1D° 2 1142220 2s2 2p3

( 2 D°)4d 4d' ipo 1 1841090

2s2 2p3

( 2 D°)3d 3d' 3S° 1 1145020 2s2 2p3

( 2 D°)4d 4d' 3po 2

1 1343320

2s2 2p3

( 2 D°)3d 3d' ip° 3 1150250 0

2s2 2p3

(

2 P°)3d 3d" 3po 0 1164220 400

640

2s2 2p3

( 2 D°)4d 4d' 3g° 1 1845030

1 1164620

2 1165260 2s2 2p3

(

2 D°)4d 4d' iD° 2 1845480

2s2 2p3 (

2 P°)3d 3d" 4 2s2 2p3 (2 D°)4d 4d' ipo 3 1346780

3

2 1166580

1168690 -2160

2s 2p4

( 2 S)3s 3s^ 3S 1 1359890

2s2 2p3

(

2 P°)3d 3d" iD° 2 1169150 2s2 2p3

(

2P°)4d 4d" 3p° 0

1 2s2 2p3

(

2 P°)3d 3d" 3 D° 3 1169890 -1260

12 1371220

2 1170650

1 2s2 2p3

(

2 P°)4d 4d" 3 D° 3 1878440 -1700

2 1375140

2s2 2p3

( 2 P°)3d 3d" ipo 1 1171050 1

2s2 2p3

( 2 P°)3d 3d" ipo 3 1174450 2s2 2p3

(

4 S°)5d 5d 3D° 1, 2,3 1875250

2s 2p4 (

4 P) 3s 3s'" 3 P 2 1204550 -950 2s2 2p3

(

2 P°)4d 4d" iF° 3 1376860

1 1205500

0 2s2 2p3

( 2 D°)5s 5s' iD° 2 1405220

2s2 2p3

(

4 S°)4s 4s 3S° 1 1218290

2s2 2p3 (

2 P°)5d 5d" 3po 0

2s2 2p3 (

2 D°)4s 4s' 3 D° 3, 2,1 1274550 12 1465780

2s2 2p3

(

2 D°)4s 4s' iD° 2 1279680

2s2 2p3 (

2P°) 5d 5d" 3D° 3 1466990

2s2 2p3

(

4 S°)4d 4d 3D° 1, 2,3 1282960 2

1 2s 2p4

( 2 D)3s 3s

1 ^ 3 D 3, 2,1 1293290

1 A1 vii (

4Sf^) Limit 1536300

February 1947. A1 vi Observed Terms*

Config.

ls2 +

Observed Terms

2s2 2

p

4 { 2p4 4 S

2p4 3 P

2

p

4 4 D

2s 2p5 {

2p? 3 P°

2p5 ipo

ns (n> 3) nd (n> 3)

2s2 2p3

( 4 S°)nx 3,4s 3S° 3-5d 3 D°

2s2 2p3 (

2 D°)nx'

{

3,4s' 3 D°

3-5s' iD°

3, 4d' 3S° 3, 4d' 3 P°

3, 4d' 4 P°

3, 4d'

3, 4d'

3 D°

iD°

3d' 3 F°

3, 4d' 4 F°

2s2 2p3

(

2 P°)nx"

{

3s" 3 P°

3,4s" 4 P°

3-5d" 3 P°

3d" 4 P°

3-5d"

3d"

3 D°

iD° CO

CO O

O

2s 2p4 (

4 P)»x'" 3s'" 3 P

2s 2p4 ( 2 D)nxIV 3sIV 3 D

2s 2p4 (

2 S)nxv 3

sv 3 S

*For predicted terms in the spectra of the O I isoelectronic sequence, see Introduction,
135

Al yii

(N i sequence; 7 electrons) Z= 13

Ground state Is2 2s2 2_p

3 4S°H

2p3 4S^ 1951830 cm-1

I. P. 241.93 volts

The analysis is from Ferner who kindly furnished his manuscript in advance of publication. He has extended the earlier work by Soderqvist to include 76 classified lines between

58 A and 96 A. One intersystem combination has been observed, but the relative positions of

the doublet and quartet terms are determined from the series. The unit used by Ferner, 103 cm-1

, has here been changed to cm-1

. REFERENCES

J. Soderqvist, Nova Acta Reg. Soc. Sci. Uppsala [IV] 9, No. 7, 64 (1934). (T) (C L)

E. Ferner, Ark. Mat. Astr. Fys. (Stockholm) 36A, No. 1, p. 42 (1948). (I P) (T) (C L)

Al vii Al vn

Author Config. Desig. J Level Inter- val Author Config. Desig. J Level

2p

4 S2 2s2 2p3 2p3 4 S° 1 X 0 3d 2 D2 2s2 2p2

(

3 P)3d 3d 2 D l X 1343710

2 D3 2)4 1344530

2p

2 D2 2s2 2p

3 2p3 2 D° 1 X 60700

2 60 D3 2y2 60760 3d 2 F4 2s2 2p2 (

4 D)3d 3d' 2 F 3)4 1366720

2 f3 2)4 1367160

2v

2 Pi 2s2 2

p

3 2p

3 2 po y2 98000

2 270 P2 i X 98270 3d 2 D2 2s2 2p2 (4 D)3d 3d' 2 D 1)2 1369270

2 D3 2)4 1369960

2p' 4 P3 2s 2

p* 2p* i-p 2)4 280200 -2460

-1300

4 P2 i h 282660 3d 2 Pj 2s2 2p2

(

4 D)3d 3d' 2P X 1378290

4 Pi y2 283960 2P2 1/2 1379130

2p' 2 D3 2s 2p* 2p

4 2 D 2)4 384260 -50 f X 1 2 d2 ix 384310 3p' 4P 2s 2p3 (

5 S°)3p 3p'" 4P

1 2)4 I 1383700

2V'

2 Si 2s 2p* 2p* 2S y2 451360

3d 2 Sj 2s2 2p2

(

1 D)3d 3d' 2 S X 1384370

2p' 2 P2 2s 2p4 2p

4 2P i X 476090

2 -2960

Pi y2 479050 3d 2 D 2s2 2p2

(

4 S)3d 3d" 2 D 1410380

3s 4 Pj 2s2 2p2

(

3P) 3s 3s 4P y2 1147100 1530

2290

4 P2 l X 1148630 r x 1 4 Ps 2)4 1150920 3d' 4 D 2s 2p3

(

5S°)3d 3d'" 4 D° to 1478060

l 3)4 J 3s 2 Px 2s2 2p2 (

3 P)3s 3s 2P X 1162360

2 2770 P2 l X 1165130 2s2 2p2

( 3 P)4s 4s 4 P X

4s 4 P2 1/2 1540740

3s 2 D 2s2 2p2

(

J D)3s 3s' 2 D nx \ 1196680

4p3 2/2 1542850 — 2s2 2p2 (

3 P)4s 4s 2 P X

3s 2 Sj 2s2 2p2

(

1 S) 3s 3s" 2 S y2 1246840 4s 2 P2 1/2 1540820

3d 2 P2 2s2 2p2

(

3 P)3d 3d 2 p IX 1315640 -780 3d' 4 P3 2s 2p3

(

3 D°)3d 3dIV 4 P° 2/ 1591560

2 Pi y2 1316420 4 p2 1/2 1592170

4 Pi X 1592550

CO CO CO 2s 2p3

(

5 S°)3s 3s"' 4 S° IX 1322180

{

3d 2F3 2s2 2p2

( 3 P)3d 3d 2 F 2)4 1323370 /o} 3020 3d' 4 D 2s 2p3

( 3 D°)3d 3dIV 4 D° 1598270

2f4 3)4 1326390 l 3)4 J 2s2 2p2

(

3P)3d 3d 4 D 3)4 4d 2 P2 2s2 2p2

(

3 P)4d 4d 2P 1/2 1598890

3d 4 D32 2)4 l 1323940 X

4 Dj

1/2 I X 1324710 -770

3d' 4 S2 2s 2p3 (

3 D°)3d 3dIV 4 S° 1/2 1599800

3d 4 P3 2s2 2p2

(

3P)3d 3d 4 P 2)4 1326960 -1030 — 560

2s2 2p2

( 3 P)4d 4d 4 D 3/2

4 P2 4P|

1/2h

1327990

1328550 4d 4 D32 1600670

4 Di X 1601740

Inter- val

820

-440

690

840

2110

-610

-380

-1070
136

A1 VII

Continued A1 VII

Continued

Author Config. Desig. J Level Interval Author Config. Desig. J Level Interval

4d 2 FS 2s2 2p2

(

3 P)4d 4d 2F 2% 1603550 2710 2s2 2p2

(

3 P)5s 5s 4P X

2 F4 3/2 1606260

5s 4 P3 1/2 2X 1702070

4d

4 P3 2s2 2p2

( 3 P)4d 4d 4P 2/ 1605240

1/2 5d 2 F3 2s2 2p2

( 3 P) 5d 5d 2 F 2/ 1729840 2570 X

2 f4 3X. 1732410

4d 2D2 2s2 2p2

( 3 P)4d 4d 2 D 1 X 1610820 740

1060

4

d' 4 D4 2s 2p3

(

5 S°)4d 4d' /7 4 D° 3 X. 1789890 -210

-370

2 D3 4d

2 D2 2s2 2p2

(

1 D)4d 4d' 2 D

2/2

1/2

1611560

1646820

4 D3

4 d21 2/

{1}

1789600

1739970

2 D3 2/2 1647880

(2/2 \ {11}

13/2 J

5d 2F43 2s2 2p2 0D)5d 5d' 2F 1773560

4d 2 F34 2s2 2p2

(

1 D)4d 4d' 2JP 1647430

4d 2Sj 2s2 2p2

(

x D)4d 4d' 2 S X 1654160

A1 viii ( 3 P0) Limit 1951830

March 1947. A1 yii Observed Terms*

Config.

ls2 +

Observed Terms

2s2 2p

3 |2p

3 4 S°

2p3 2p° 2p3 2 D°

2s 2

p

4 {2p* 2 S

2pi 4p

2

p

4 2 P 2p4 2 D

ns (n> 3) np (n> 3) nd (n>3)

2s2 2p2

(3 P)nx

{

3-5s 4 P

3,4s 2 P

3, 4d

3, 4d

4 P 3, 4d 4 D

2 P 3, 4d 2 D 3-5d 2 F

2s2 2p2 (

1 D)nx/ 3s' 2D 3, 4d' 2S 3d' 2P 3, 4d' 2 D 3-5d' 2 F

2s2 2p2

(

1 S)nx" 3s" 2S 3d" 2 D

2s 2p3

(

5S°)nx'" 3s'" 4S° 3p"' 4 P 3, 4d'" 4 D°

2s 2p3

(

3 D°)na:IV 3dIV 4 S° 3dIV 4 P° 3dIV 4D°

*For predicted terms in the spectra of the N i isoelectronic sequence, see Introduction.

A1 VIII

(C i sequence; 6 electrons) Z—13

Ground state Is2 2s2 3P0

2p

2 3P0 2300390 cm"1 I. P. 285.13 volts

The analysis is by Femer, who has generously furnished his manuscript in advance of

publication. He has extended the earlier work by Soderqvist to include 77 classified lines in

the region between 53 A and 91 A. The relative values of the singlet, triplet, and quintet

systems of terms are determined from the series limits.

Femer’s unit, 103 cm-1

, has here been converted to cm-1

. REFERENCES

J. Soderqvist, Nova Acta Reg. Soc. Sci. Uppsala [IV], 9, No. 7, 77 (1934). (T) (C L)

E. Femer, Ark. Mat. Astr. Fys. (Stockholm) 36A, No. 1, p. 37 (1948). (I P) (T) (C L)
137

A1 Yin A1 viii

Author Config. Desig. J Level Inter- val Author Config. Desig. J Level Interval

2p

3 P0 2s2 2p2 2p2 3 P 0 0 1740 3d' sp

3 2s 2p2

(

4 P)3d 3d 5P 3 1631170 + y -890

-610

3 Pi 1 1740 2700

5 P2 2 1 632060 + y

3 P2 2 4440 5Pi 1 1632670 +y

2p *D2 2s2 2p2 2p2 4 D 2 46690+x 3d' 3 P2 2s 2p2

(

4 P)3d 3d 3 P 2 1633840

3 -1600 Pi 1 1635440

2V 2s2 2p2 2p

2 4 S 0 96170+x 0

2

p' SS2 2s 2

p

3 2p3 5 S° 2 188510+y 3d' 3 F2 2s 2p2

(

4 P)3d 3d 3 F 2 1643590

3 1400 f3 3 1644990

2

p' 3 D3 2s 2

p

3 2p3 3 D° 3 262190 -130

-70

3 f4 4 1646790 1800

3 d2 2 262820

3 Di 1 262890 3

p' 4 F3 2s 2p2 (

2 D)3p 3p' 1F° 3 1659180+x

2

p' 3 P 2s 2

p

3 2p3 3p° 0, 1,2 309180 S? 3 Sj 2s 2p2 (

2 S) 3s 3s" 3 S 1 1662740

2

p' 4 D2 2s 2

p

3 2p3 4 D° 2 896990+x 3d' 3 Di 2s 2p2 (

4 P)3d 3d 3 D 1 1664880

3 D 500

2 2 1665380

2p' 3 Sj 2s 2

p

3 2p3 3 S° 1 404220 3 d3 3 1665930 550

2p' iPi 2s 2

p

3 2p3 ipo 1 444550+x 3p' 'D2 2s 2p2

(

2 D)3p 3

p' iD0 2 1667490+x

3s 3 P0 2s2 2p(2 P°)3s 3s 3p° 0 1819280 1170

3630

2s 2p2

(

2 P)3s 3s'" 3 P 0

3 Pi 1 1820450 = 1

3 P2 2 1324080 3s' 3 P2 2 1682590

3s 2s2 2p(2 P°)3s 3s ipo 1 1885270+x 3d' 3 F 2s 2p2

(

2 D)3d 3d' 3 F 2, 3,4 1733950

3p

3 S, 2s2 2p(2 P°)3p 3P

3 S 1 1402180 3d' 3 D 2s 2p2 (

2 D)3d 3d' 3 D 1, 2,3 1742250

3s' 5Pi 2s 2p2

(

4 P) 3s 3s sp 1 1465810 + p 1660

2210

3d' 3 P2 2s 2p2 (

2 D)3d 3d' 3 P 2 1745690 -1250

-1700

5P2 2 1467470 + y

3 Pi 1 1747940

5 p3 3 1469680+ y

3 Po 0 1749640

3d 3 F2 2s2 2p(2P°)3d 3d 3p° 2

o

1 468700 +x 3d' 3 Si 2s 2p2

( 2 D)3d 3d' 3 S 1 1762090

4 2s2 2p(2 P°)4s 4s 3 P° 0

1 3d 4 D2 2s2 2p(2 P°)3d 3d iD° 2 1471980+x 4s 3P2 2 1785880

3d 3 Di 2s2 2p(2 P°)3d 3d 3 D° 1 1484560 680

1470

2s 2p2

(

2 S) 3d 3d" 3 D 1

3 D2 2 1485240 3d' 3 D2 2 1815990

3 d 960

3 3 1486710 3d3 3 1816950

3d 3 P2 2s2 2p(2 P°)3d 3d 3p° 2 1490590 -980

-570

3f 2s 2p2 (

2 P)3d 3d'" 3 F 2, 3,4 1831700

3 Pi 1 1491570

3 Po 0 1492140 3d' 3 D 2s 2p2

(

2 P) 3d 3d'" 3 D 1, 2,3 1840570

2s 2p2 (

4 P)3s 3s 3p 0 2s 2p2

(

2 P)3d 3d'" 3P 0

3s' 3 Pi

3 P2

12 1504810

1507220 24103T' 3 P2

12 1844390

CO ft. 2s2 2p(2 P°)3d 3d ipo 3 1509210+x 2s2 2p(2 P°)4d 4d 3 D° 1 4d 3 D2 2 1846180 1310 3d iPj 2s2 2p(2 P°)3d 3d ipo 1 1510060+x 3 d3 3 1 847490

3p' 3 SX 2s 2p2

( 4 P)3p 3P

3 S° 1 1531270 4d 4 Pi 2s2 2p(2 P°)4d 4d 4 P° 1 1853670+x

3p' 3 Di 2s 2p2 (

4 P) 3p 3P3 D° 1 1564140 700

2000

4d' 5P3 2s 2p2 (

4 P)4d 4d ®P 3 1991450 + y -800

-510

3 D2 2 1564840 6p2 2 1992250 + y

3 d3 3 1566840 6Pi 1 1992760+ y

2s 2p2

(

4 P)3p 3p

3p° 0 2s 2p2

(

4P)4d 4d 3 F 2

1 4d' 3 F3 3 1997710 2000 3p' 3 P2 2 1577760 3 f4 4 1999710

3s' 3 D 2s 2p2

(

2 D)3s

2s 2p2

(

2 D)3s

3s' 3 D 1, 2,3

2

1585400

3s' iD2 3s' 4 D 1 608440 +x A1 ix (

2 P^) Limit 2300390

March 1948.
138

A1 yiii Observed Terms*

Config.

ls2 +

Observed Terms

2s 2 2p2

r 2p

2 \2p2 *S3 P

2p

2 ! D

2s 2

p

3

f 2p3 5 S°

2p

3 3 S° 2p

3 3 P° 2p

3 3 D°

[ 2p

3 ip° 2p3 !D°

ns (n> 3) np ( n> 3) nd (n> 3)

2s2 2p(2 P°)nx f 3, 4s

\ 3s

3 jp° ipo

3p

3 S 3d

3, 4d

3p°

ipo

3, 4d

3d

3 D° 3d

iD 0 3d

3p°

iF°

2s 2p2

(

A P)nx f 3s 3 P 3, 4d 5 p

{ 3s 3 P 3p

3 S° 3p

3 P° 3p3 D° 3d 3 P 3d 3 D 3, 4d 3 F

2s 2p2

(

2 D)nx'

{

3s' 3 D

3s' !D 3p' 1 D° 3p' X F°

3d' 3 S 3d' 3 P 3d' 3 D 3d' 3 F

2s 2p2

(

2 S)nx" 3s" 3 S 3d" 3 D

2s 2p2

(

2 P)nx'" 3s"' 3 P 3d'" 3 P 3d'" 3 D 3d'" 3 F

*For predicted terms in the spectra of the C i isoelectronic sequence, see Introduction.

A1 ix

(B i sequence; 5 electrons) Z= 13

Ground state Is2 2s2 2p 2P^

2p 2Pj 2663340 cm"1 I. P. 330.1 volts

Ferner has extended the preliminary analysis by Soderqvist and now has 74 classified

lines in the range between 43 A and 77 A. He kindly furnished his manuscript in advance

of publication.

No intersystem combinations have been observed, as indicated by x in the table, but the

absolute values of the doublet and quartet terms are determined from series. The quartet

terms are not all connected by observed combinations.

Ferner’s unit, 103 cm-1

, has here been changed to cm-1

. REFERENCE

J. Soderqvist, Nova Acta Reg. Soc. Sci. Uppsala [IV] 9, No. 7, 90 (1934). (C L) E. Ferner, Ark. Mat. Astr. Fys. (Stockholm) 36A, No. 1, p. 30 (1948). (I P) (T) (C L)
139

AJ IX A1 IX

Author Config. Desig. J Level Interval Author Config. Desig. J Level Interval

2p

2 Pi 2s2 (

J S)2p 2P2po z 0 4890 3P'

2 D2 2s 2p(1 P°)3p 3p' 2 D 1Z 1875340

2 1370 P2 1/2 4890 2 d3 2Z 1876710

2p' 4 Pi

4 P2 2s 2p

2 2p

2 4 P Z

!X

146310 +z 148000 +x 1690

2490

w 2 P 2s 2p{}V°)dp 3p' 2P / z

l iz } 1878390

4 P3 2z 150490 +a:

{

i X

l 2/

3s" 4 Pi 2p2

(

3 P)3s 3s" 4 P z 1917920+a; 930

2p' 2250 2D 2s 2

p

2 2p2 2 D

}

259720

4 P2

4 Ps IZ

2/2 1918850 +a: 1921100 +x

2p' 2SX 2s 2

p

2 2p

2 2 S X 332650 3d' 2 F 2s 2p(1 P°)3d 3d' 2 po / 2/2 l 3Z jl933050

2p' 2 P, 2s 2p2 2p

2 2 P % 353960 2990 2 P2 1 X 356950 3d' 2 D2 2s 2p(1 P°)3d 3d' 2 D° iz 1943380

2 d 600

3 2Z 1943980

2p" 4 S2 2p

3 2pz 4 S° 1/2 461910+x

2p" 2d3 2p

3 2p3 2 D° 2/ 519560 -180

3d' 2 p 2s 2p(1 P°)3d 3d' 2po / z

1 IZ ^1954710

2 d2 1 X 519740

2p

2

(

3 P) 3p dp" 4 D° z

2p" 2 P, 2p

3 2pz 2po X

1/2 584150 240 1/2

2 P2 584390

dp" 4 D4 2Z

3Z 1986800 +x

3s 2 Sj 2s2

(

1 S)3s 3s 2 S X 1501020

2p2 mdp dp" 4po z

3d 2 d2 2s 2

(

1 S)3d 3d 2 D 1/2 1642140 240 IZ

2 d3 2/ 1642380 dp" 4 P3 2/2 1991700 +x

3s' 4 P1 2s 2p(3 P°)3s 3s 4 po X 1657690+ x 1660

2990

dp" 4 S2 2p2(3 p)3p dp" 4 S° IZ 2017670 +x

4 P2 1/2 1659350+x

4 P3 2/2 1662340+

dp" 2 D 2p2

(

1 T))dp dp'" 2 D° / IZ

1 2/2 |

2056120

3s' 2pt 2s 2p(3 P°)3s 3s 2po X 1690880

2 3230 P2 1/2 1694H0 3d" 4 P 2p2

(

3 P)3d 3d" 4P 2Z 2065270 +x -1080

-750 iz 2066350 +x

3p' 2 P1 2s 2p(3 P°)3p 3p 2P z 1720900 1500 z 2067100 +x

2P2 1 / 1722400

4d 2 D2 2s2 (

1 S)4d 4d 2D 1/2 2094020 470

3p' 2 d2 2s 2p(3 P°)3p 3p 2D 1/2 1757500 3470

2d3 2Z 2094490

2 d3 2/2 1760970

2s 2p(3 P°)4d 4d 4D° z

3p' 2 Si 2s 2p(3 P°)3p 3p

2 S z 1780950 iz

/ z

1 1Z

2Z

3d' 4 D12 2s 2p(3P°)3d 3d 4D°

1 1799090+x 400

4d' 4 d4 3Z 2254250+x

4 D3 2/2 1799490 +x 1490 4d' 4P3 2s 2p(3 P°)4d 4d 4po 2Z 2266240 +x

4 d4 3Z 1800980+

iZz

3d' 2 d2 2s 2p(3 P°)3d 3d 2 D° 1/2 1800460

2 450 d3 2/2 1800910 2s 2p(3 P°)4d 4d 2 po 2Z

f X

l 1Z

4d' 2f4 3Z 2265580

3s7 2 p 2s 2p( 1 P°)3s 3s' 2po

j

1807020

5d 2 d3 2s2

(

1 S)5d 5d 2D IX

2Z 2301150

3d' 4 Ps 2s 2p(3 P°)3d 3d 4po 2Z 1807490+

-1040

-680

4P2 1/2 1808530+

2s 2p(1 P°)4d 4d' 2 D° IZ

4 P1 z 1809210+

4d' 2d3 2Z 2393860

3d' 2 F3 2s 2p(3 P°)3d 3d 2po 2Z

3Z

1831260

2 3040 f4 1834300

A1 x (»So) Limit 2663340

3d' 2P2 2s 2p(3 P°)3d 3d 2po

1/2 1840470

2 -1750 P] z 1842220

August 1947.
140

A1 ix Observed Terms*

Config.

1 s

2 +

Observed Terms

2s2

(

4 S)2p 2p

2 P°

2s 2p2 {2p2 2 S

2

p

2 4 P

2

p

2 2 P 2p2 2 D

2p

3 |2p

3 4 S°

2p3 2 P° 2p3 2 D°

ns (n> 3) np (n> 3) nd (n> 3)

2s2

(

x S)nx 3s 2 S 3-5d

2 D

2s 2p(3 P°)nx

{ 3s 4 P°

3s 2 P° 3p 2 S 3p 2 P 3P

2 D

CO

CO^

0

0 3, 4d 4 D°

3d 2 D° 3, 4d 2F°

2s 2p( 1 P°)nx' 3s' 2 P° 3p' 2 P 3p' 2 D CO O

3, 4d' 2 D° 3d' 2F°

2p2

(

3 P)nx" 3s" 4 P 3p" 4S° 3p" 4 P° 3p" 4D° 3d" 4 P

2p2

(

1 D)nx'" 3p'" 2D°

*For predicted terms in the spectra of the Bi isoelectronic sequence, see Introduction.

A1 X

(Be i sequence; 4 electrons) Z=13

Ground state Is2 2s2

2s2 % 3215340 cm-1 I. P. 398.5 volts

Ferner has extended the preliminary analysis by Soderqvist and has classified 30 lines in

the region between 44 A and 63 A. He has kindly furnished his manuscript in advance of

publication.

No intersystem combinations have been observed, as indicated by x in the table, but

absolute values of the singlet and triplet terms are known from the series. Ferner’s unit, 103 cm-1

, has here been changed to cm-1

. REFERENCES

J. Soderqvist, Nova Acta Reg. Soc. Sci Uppsala [IV] 9, No. 7, 94 (1934). (T) (C L)

E. Ferner, Ark. Mat. Astr. Fys. (Stockholm) 36A, No. 1, p. 27 (1948). (I P) (T) (C L)
141

A1 x A1

Author Config. Desig. J Level Inter- val Author Config. Desig. J Level Inter- val

2s J So 2s2 2s2 iS 0 0 3p’ J Pi 2p( 2 P°)3p 3P

J P 1 2094730

2p

3 P0 2s(2 S)2p 2p

3 P° 0 154860+x 1690 3

p' 3 DX 2p(2 P°)3p 3P

3 D 1 2101950+x

3 P 1610

i 1 166540+x 3660

3 D2 2 2103560+x

3 P2 2 160200+x 3 d3 3 2107290+x 3730

2v

J Pi 2s(2 S)2p 2p ‘P 0

1 300400 3

p' 3 Sj 2p(2 P°)3p 3P

3 S 1 2119440+x

2p' 3 P 2p2 2p

2 3P 0 404300 +x 1 Q7H 2p(2 P°)3p 3p

3 p 0

1 406270 +x 3190 3p' 3 P1 1 2128300+x 1880 2 409460+x 3 P2 2 2130180+x

2p' *D2 2p2 2p2 »D 2 448840 3d' iD2 2p(2 P°)3d 3d >D° 2 2140690

2p' 3 So 2p2 2p2 J S 0 553270 3p' *D2 2p( 2 P°)3p 3p !D 2 2148320

3s 3 Sj 2s(2 S)3s 3s 3 S 1 1855510+x 2p( 2 P°)3d 3d 3D° 1

3s iS 3d' 3 D2 2 2161680+x 1480 3s !S0 2s(2 S)3s 0 1884330 3 d3 3 2163110+x

3v

J Pi 2s(2S)3p 3p

1 P° 1 1923850 CO R 2p( 2 P°)3d 3d 3p° 2

1 2169960+x

2171850+x -1390

3d 3 Di 2s(2 S)3d 3d 3 D 1 1965560+x 210

280

0

3 D2 2 1965770+x

3 d3 3 1966050+x 3d' *F3 2p(2 P°)3d 3d ip° 3 2192060

3d * 1)2 2s(2S)3d 3d J D 2 1992250 4d j D2 2s(2 S)4d 4d !D 2 2527470

2p(2 P°)3s 3s 3P° 0

\ 4d' !F3 2p(2 P°)4d 4d ipo 3 2714560

3s' 3 P2

3s' J Pi

2 2056910+x

2p(2P°)3s 3s ip° 1 2090980 Al xi ( 2 S*) Limit 3215340

August 1947.

Al x Observed Terms*

Config.

ls2 +

Observed Terms

2s2 2s2 *S

2s(2 S)2p

{

2p

3 P°

2p »P°

2p2 {2p2 *s 2p

2 3 P

2p

2 J D

ns ( n> 3) np ( n> 3) nd (n> 3)

2s(2S)nx /3s

\3s

3 S

IS 3p

iP° 3d 3 D

3, 4d *D

2p(2 P°)nx

{ 3s 3 P°

3s iP°

3p

3 S 3p

3 P

3p >P

3p

3 D

3p !D

3d 3 P° 3d 3 D°

3d >D° 3, 4d !F°

*For predicted terms in the spectra of the Be i isoelectronic sequence, see Introduction.
142

A1 XI

(Li i sequence; 3 electrons) Z=13

Ground state Is2 2s 2SH

2s 2S^ 3564900 cm-1

I. P. 441.9 volts

The analysis is by Ferner, who kindly furnished his manuscript in advance of publication. Seven lines have been classified between 39 A and 54 A. Observations of the resonance

lines have not been reported. Some of the relative levels have been connected by a study of

the behavior of the Rydberg denominators rather than by the Ritz combination principle.

Ferner’s unit, 103 cm-1

, has here been changed to cm-1

. REFERENCE

E. Ferner, Ark. Mat. Astr. Fys. (Stockholm) 36A, No. 1, p. 25 (1948). (I P) (T) (C L)

A1 XI

Config. Desig. J Level Inter- val

2s 2s 2 S J4 0

2V 2p

2 P° H

1/2 175900

181820 5920

3s 3s 2 S K 2020460

3p 3p

2 P° X

1/2 2068770

2070520 1750

3d 3d

2 D VA

2)4

2087980

2088540 560

4d 4<Z 2 D 1 X

2y2 2734140

A1 xii OSo) Limit — 3564900

August 1947.
143

A1 xii

(He i sequence; 2 electrons) Z— 13

Ground state Is2 XS0

Is2 % 16825000 ±3000 cm"1 I. P. 2085.46 ±0.37 volts

Flemberg has observed the first three members of the singlet series; the lines are in the

region between 6 A and 7 A. He has calculated absolute term values on the assumption that

the P-terms can be represented by a Ritz formula.

The unit adopted by Flemberg, 103 cm-1

, has here been changed to cm-1

. REFERENCE

H. Flemberg, Ark. Mat. Astr. Fys. (Stockholm) 38A, No. 18 p. 34 (1942). (I P) (T) (C L)

A1 xii

Config. Desig. J Level

Is2 Is 2 2 S 0 0

Is 2p 2p

ip° 1 12891900

Is 3p 3p

ip° 1 15072700

Is 4p 4p !P° 1 15888600

A1 xiii (

2 S«) Limit --- 16825000

October 1946.
SEE REVISION IN NSRDS-NBS 3, Section 2, November 1967.

SILICON

Si I

14 electrons Z=14

Ground state Is2 2s2 2p6 3s2 3p2 3P0

3p2 3P0 65743.00 cm-1

I. P. 8.149 volts

The terms are from Kiess, who has revised and extended the earlier work on analysis.

He has published a complete list of classified lines extending from 1565 A to 12270 A. His

notation has been adopted throughout, except for the following entries, which have been changed

for uniformity:

Kiess Desig. Kiess Desig.

3p

3 P 3p2 sp 3p' 3 D° 3p3 3 D°

3v 3p

2 !D x’ 1°

3V

X S 3p2 iS x" 2°

The singlet and triplet terms are connected by numerous intersystem combinations. No

quintet terms have been found.

The Si i sequence invites further study from the theoretical point of view. In Si i the

3d

3D° term is lower than the 3p3 3D° term. In later members of the sequence the corresponding terms appear in the reverse order.

The extension by Kiess of the laboratory analysis to cover the infrared region has been of

special astrophysical importance. The leading lines of Si i are strong in the solar spectrum.

Conversely, the solar wave-number separations within the multiplets afford a valuable check on the accuracy of infrared solar wavelengths, provided the Si lines are unblended in the sun. The satisfactory internal agreement within the “solar” Si multiplets has also justified the use

of this method to identify solar lines by prediction.as unquestionably due to Si, although they

have not yet been observed in the laboratory.

REFERENCES

H. D. Babcock, C. E. Moore and W. P. Hoge, Mt. Wilson Contr. No. 534; Astroph. J. 83, 118 (1936). C. C. Kiess, J. Research Nat. Bur. Std. 31, 85, RP1124 (1938). (I P) (T) (C L) (E D)
145

Si I Si I

Config. Desig. J Level Interval Config. Desig. J Level

3s2 3p2 3p2 3 P 0 0. 00 77 15 3s2 3p(2 P°)5p 5p 3 D 1 56978. 00 1 77. 15

146. 16 2 57017. 26 2 223. 31 3 57197. 94

3s2 3p2 3p2 *D 2 6298. 81 3s2 3p(2 P°)5p 5p 3P 0 57295. 76 1 57328. 64 3

2 3p2 3p2 *S 0 15394. 24 2 57468. 18

3s2 3p(2 P°)4s 4s 3 P° 0 89688. 10 77 10 3s2 3p(2 P°)4d 4d 3 F° 2 57872. 44 1 39760. 20

194. 92 3 57450. 70 2 89955. 12 4 57583. 85

3s2 3p(2 P°)4s 4s J P0 1 40991. 74 3s2 3p(2 P°)5p 5p 3 S 1 57541. 86

3s2 3p(2 P°)3d 3d 3 D° 1 45276. 20 17 40 3s 2 3p(2 P°)5p 5p !D 2 57797. 82 2 45298. 60

28. 26 3 45321. 86 3s2 3p(2 P°)5p 5p iS 0 58311. 19

3s2 3p(2 P°)4p 4p !P 1 47284. 20 3s2 3p(2 P°)4/ 4/ *F 3 58774. 18

3s2 3p(2 P°)3d 3d iD0 2 47351. 50 3s2 3p(2 P°)4/ 4/ 3 F 2 58775. 44 3 58786. 80

3s2 3p(2 P°)4p 4p 3 D 1 48020. 00 82 38 4 58789. 00 23

48102. 38

48264. 35

161. 97

3s2 3p(2 P°)4d 4d ip° 1 58802. 00

3s 3p3 3p3 3 D° 1 48899. 15 178 45 3s2 3p(2 P°)4d 4d !F° 3 58893. 28 2 48577. 60

296. 36 3 48873. 96 3s2 3p(2 P°)4/

4/ 3 G 3 59035. 15 4 59037. 00

3s2 3p(2 P°)4p 4p 3 P 0 49028. 17 29 2« 5 59053. 84 12

49060. 55

49188. 61

128. 06

3s2 3p(2 P°)5d 5d 3 D° 1 59056. 70 2 59082. 42

3s2 3p(2 P°)4p 4p 3 S 1 49399. 66 3 59118. 51

3s2 3p(2 P°)3d 3d 3 F° 2 49850. 98 S3 1 Q

3s2 3p(2 P°)4f 4/ 3D 3 59109. 75 3 49934. 12

137. 76 2 59190. 84 4 50071. 88 1 59190. 40

3s2 3p(2 P°)4p 4p 2 50189. 43 1° ? 59109. 9

3s2 3p(2 P°)3d3d 3 P° 2 50499. 44 66 51 3s2 3p(2 P°)4/ 4/ iD 2 59110. 91 10

50565. 95

50602. 15

-36. 20 2° ? 59182. 5

3s2 3p(2 P°)4p 4p *S 0 51611. 77 3s2 3p(2 P°)6s 6s 3 P° 0 59220. 76 1 59273. 28

3s2 3p(2 P°)3d 3d !F° 3 58862. 41 2 59506. 17

3s2 3p(2 P°)3d 3d 'F° 1 53387. 17 3s2 3p(2 P°)6s 6s !P° 1 59686. 84

3s2 3p(2 P°)4d 4d 3 D° 1 54184 97

20. 15

52. 28

3s2 3p(2 P°)5d 5d 3 P° 2 59917. 85 2 54205. 12 1 60010. 10 3 54257. 40 0 60042. 48

3s2 3p(2 P°)5s 5s 3 P° 0 54244 58

69. 32

213. 98

3s2 3p(2 P°)5d 5d 1 D° 2 60299. 92 1 54818. 90

3s2 3p( 2 54527. 88 2 P°)5d 5d 3 F° 2 60645. 49 3 60705. 90

3s2 3p(2 P°)5s 5s ip° 1 54870. 99 4 60849. 13

3s2 3p(2 P°)5p 5p

ip 1 56425. 1 3s2 3p(2 P°)5/ 5/ *D 2 61303. 28

3s2 3p(2 P°)4d 4d ! D° 2 56508. 00 3s2 3p(2 P°)5/ 5/ 3 F 2 61304. 50 3 61304. 86

3s2 3p(2 P°)4d 4d 3 P° 2 56690. 94 -9. 90

-32. 40 4 61306. 57 10

56700. 84

56788. 24

Interval

39. 26

180. 68

32. 88

139. 54

78. 26

133. 15

11. 36

2. 20

1. 85

16. 84

-24. 28

86. 09

-81. 09

0. 44

52. 52

232. 89

-92. 75

-32. 38

60. 41

143. 23

0. 36

1. 71
146

Si I—Continued Si I—Continued

Config. Desig. J Level Interval Config. Desig. J Level Interval

3s2 3p(2 P°)5d 5d

X P° 1 61808. 82 3s2 3p(2P°)6/ 6/ 3 F 2

o 62668. 50

3s2 3p(2P°)6d 6d 3 D° 1 61510. 71 86 78

o

4

2 61423. 93

151. 87

3 61575. 80 3s2 3p(2P°)8s 8s 3 P° 0 62758. 05

55. 90

114. 80 3s2 3p(2 P°)5d 5d 3F

0 3 61424- 00

12

62808. 95

62928. 75

3s2 3p(2 P°)7s 7s 3 P° 0 61540. 00

54. 80

228. 64

3s2 3p(2 P°)6d 6d l F° 3 62802. 00

1 61594- 80

3s2 3p(2 P°)7d 7

2 61828. 44 3 D° 1 62873. 90

1. 28

61. 12

2 62875. 18

3s2 3p(2 P°)5/ 5/ 3 G 3 61562. 37

1. 38 3 62986. 80

4 61563. 75

5 3s2 3p(2 P°)8s 8s !P0

1 63180. 60

3s2 3p(2P°)5/ 5/

3D 3 61597. 12 -0. 78

-0. 70

3s 2 3p(2 P°)7d 7d

3F° 2 68257. 61

96. 09

26. 93

2 61597. 90 3 68353. 70

1 61598. 60 4 63580. 63

3s2 3p(2 P°)6d 6d

3P° 2 61845. 96 -90. 90

-33. 42

3s2 3p(2 P°)7d 7d

1F

° 3 68642. 55

1 61986. 86

0 61970. 28 3s2 3p(2 P°)8d 8d

3 D° 1o

3s2 3p(2P°)7s 7s 'F° 1 61881. 50 3 63758. 85

3s2 3p(2 P°)6d 6d

1 D° 2 62155. 20 3s2 3p(2 P°)9s 9s ip° 1 63884- 95

3s2 3p (2P°)6d 6d 3 F° 2 62349. 27 27 41 3

4 Si ii (

2P£) Limit 65743.00

62876. 68

62534- 46

157. 78

October 1947.

Si i Observed Terms*

Config.

Is2 2s2 2p«+ Observed Terms

3s2 3p2

f 3p

2 3 P

\ 3p

2 iS 3p

2 X D

3s 3p3 3p3 3 D°

ns (n> 4) np (n> 4)

3s2 Zp(2 F°)nx / 4-8s 3 P°

\ 4r-9s iP°

4, 5p

3 S

4, 5p

J S

4, 5p

3 P

4, 5p

J P

4, 5p

3 D

4, 5p

X D

nd ( n> 3) nf («> 4)

3s2 Zp(2 F°)nx f3-6d 3 P° 3-8d 3 D°

\3-5d 1 P° 3-6d >D°

3-7d 3 F°

3-7d iF0

4, 5/ 3 D

4, 5f iD

4-6/ 3 F

4/ iF

4, 5g

3 G

*For predicted terms in the spectra of the Si i isoelectronic sequence, see Introduction.
SEE REVISION IN NSRDS-NBS 3, Section 1, June 1965.

Si II

147

(A1 1 sequence; 13 electrons) Z=14

Ground state Is2 2s2 2p(> 3s2 3p

2P^

3p

2Pj 131818 cm”1 I. P. 16.34 volts

The doublet terms from the X S limit in Si in are from Fowler. His values of nj 2F°, n=7

to 9, are from his series formula and are indicated by brackets in the table, although they appear

to be confirmed by observed combinations with Sp2 2D.

The ?>p

2 2P term has been calculated from the data given by Bowen and Millikan in 1925.

The remaining terms are from Bowen, who pointed out in his 1928 paper that Fowler’s

term called “x” is 3p2 2D; and listed the two lines classified as Sp 2P°—

3

p

2 2S. This combination has been used to calculate ?>p

2 2S. The quartet terms are from Bowen’s 1932 paper. No intersystem combinations have

been observed and the uncertainty, x, may be considerable. Bowen remarks that the relative

positions of the doublet and quartet terms are only approximately determined by assuming

that the difference between the terms 4s 2S and 4s 4P° is equal to that between the terms

3s2 2 S and 3p

3P° in Si in.

REFERENCES

A. Fowler, Phil. Trans. Roy. Soc. London [A] 325, 20 (1925). (I P) (T) (C L)

I. S. Bowen and R. A. Millikan, Phys. Rev. 26, 160 (1925). (T) (C L)

I. S. Bowen, Phys. Rev. 31, 37 (1928). (C L)

I. S. Bowen, Phys. Rev. 39, 13 (1932). (T) (C L)

C. C. Kiess, J. Research Nat. Bur. Std. 21, 205, RP1124 (1938). (C L)

Si II Si II

Config. Desig. J Level Interval Config. Desig. J Level Interval

3s2 0S)3p 3p

2 P° K

i X

0

287 287 3s2 0S)5/ 5/ 2 F° j 2y2

1 3/ | 113756. 60

3s 3p2 3p2 4P y 44080. 3+x 110. 6

173. 5

3s2 pS) 6p 6p 2P° y

iy

114048. 7

9. 1 iy

2/

44190. 9+x

44364. 4+x

114057. 8

3s2 (iS) 7s 7s 2 S y 117908. 93

3s 3p2 3p2 2 D iy 55303. 93

15. 91

2y 55319. 84 3s 3p( y

3 P°)4s 4s 4P° 118118. 0+x 116 0

y

1 y 118234- 0+x 199. 9

3s2

(

1 S)4s 4s 2 S 65495. 08 2/2 118433. 9+x

3s 3

p

2 3

p

2 2 S y 76663. 9

3s2

(

1 S) Qd 6d 2 D / 1H

l 2H } 118516. 6

3s2 PS)3d 3d 2 D i y 79334. 89

16. 60

2y 79351. 49 3s2 OS) 6/ 6/ 2 F° r 254

l 3^ } 119307. 57

3s2 pS)4p 4p 2 P° y 81185. 98

60. 00 iy 81245. 98 3s2 PS)7/ 7/ 2F° f 2/

l 3/ }

[ 122649

]

3s 3p2 3p2 2 P y 83800 204 iy 84004 3p3 3p3 4 S° 1 y 124291. 2+x

3s 2

(

1 S) 5s 5s 2 S y 97966. 60 3s2

(

1 S)8/ 8/ 2 F° 1 2H

i 3yi }

[ 124814] 3s2 pS)4d 4d 2 D iy 101017. 58

1. 30 2y 101018. 88 3s2 (

1 S)9/ 9/ 2 F° 1 2a

\ 3a }

[1262941

3s 2 (iS) 4/ 4/ 2 F° l 2 y2 l 3/2 y

} 103552. 58 Si in OS0) 3s 3p(3 P°)4p

Limit 131818

3s2 OS) 5p 5p

2 P° 103855. 29

24. 31 4p

4 P 4

135272. 4+x 62 2 103879. 60 iy

2y

135334. 6+x

135469. 4+x 13+ 8

3s2 (iS) 6s 6s 2 S X 111178. 95

3s 3p(3 P°)4p 4p 4 S 1 y 136161. 1+x

3s 2 pS)5d 5d 2 D / 1 y

X 2/ } 112389. 2

September 1947.
Si ii Observed Terms*

Config.

Is 2 2s2 2

p

6 +

Observed Terms

3s2 OS) 3p

3s 3p2

3p

3

3p

2 P°

/ 3p

2 4 P

\ 3p

2 2 S 3p2 2 P 3p2 2 D

3p

3 4 S°

ns (n> 4) np (> 4) nd (n> 3) nf (n> 4)

3s2

(

1 S)na; 4-7s 2 S 4^6p 2 P° 3-6d 2 D 4^-6f2 F°

3s 3p(3 P°)nx 4s 4 P° 4p 4 S 4p

4 P

*For predicted terms in the spectra of the Al i isoelectronic sequence, see Introduction.

Si III SEE REVISION IN NSRDS-NBS 3, Section 1, June 1965.

(Mg i sequence; 12 electrons) Z= 14

Ground state Is2 2s2 2p6 3s2 XS0

3s2 X S0 269940.6 cm"1 I. P. 33.46 volts

The analysis is from Bowen, who has extended the earlier work of Fowler, by observations

in the ultraviolet. Ninety-six lines have been classified in the interval 566 A to 5739 A. One

intersystem combination, 3s2 XS —Sp

3Pi, is given, but Bowen states that the identification of

this line is dubious. He remarks further that “the term values of the singlets and triplets can

be independently determined with an accuracy that precludes any large shift in the relative

position of the two systems, regardless of this identification.” The irregular doublet law for

the isoelectronic sequence through P iv confirms this classification, as has been pointed out by

Robinson.

Van Vleck and Whitelaw, by analogy with Al ii, using a rigorous series formula, have recalculated the absolute value of 5g 3 G as equal to 39831 cm-1 as compared with Fowler’s value

39741 cm-1 and Bowen’s value 39734.0 cm-1. REFERENCES

R. A. Sawyer und F. Paschen, Ann. der Phys. [IVJ 84,, 8 (1927). (T)

I. S. Bowen, Phys. Rev. 39, 8 (1932). (I P) (T) (C L)

H. A. Robinson, Phys. Rev. 51 , 731 (1937).

J. H. Van Vleck and N. G. Whitelaw, Phys. Rev. 44, 560 (1933). (T)
149

Si ill Si in

Config. Desig. J Level Interval Config. Desig. J Level Interval

3s2 3s2 *S 0 0. 0 3s(2 S)4d 4d *D 2 204329. 6

3s(2 S)3p 3p 3 P° 0 52680 128

261

3s(2 S)5s 5s »S 1 206079. 6

12 52758

58019 3s(2 S)5s 5s J S 0 207872. 5

3s(2 S)3p 3p 1 82883. 0 3s(2 S)4/ 4/ *F° 2 209486. 7

27. 6

39. 5

3 209464. 8

3p2 3

p

2 *D 2 121946 4 209508. 8

3s (

2 S) 3d 3d *D 2 122213. 0 3p(2 P°)3d 3d 3 P° 2

1 216095

216198 -98

-62

3p

2 3p2 *P 0 129615 132

259

0 216255

1 129747

2 130006 3p(2 P°)3d 3d 3 D° 1 217290

54

51

2 217844

3s(2 S)3d 3d *D 3 142847. 6 -2. 1 -2. 03 217395

2 142849. 7

1 142851. 7 3p(2 P°)4s 4s 3 P° 0 226805

127 295

1 226482

3s(2 S)4s 4s 3 S 1 153281. 0 2 226727

3p

2 3p2 *S 0 153443. 0 3s(2 S)5<7 5g3 G 3, 4,5 230206. 6

3s(2 S)4s 4s 2 S 0 159068. 4 3s(2 S)6<7 6g

3 G 3, 4, 5 242379. 0

3s(2 S)4p 4p 3 P° 0 175184- 0

33. 0

73. 2 3p(2 P°)4p 4p 3 P 0 247776

83

214

1 175167. 0 1 247859

2 175240. 2 2 248073

3s(2 S)4p

3s(2 S)4d

4p »P° 4d *D

1 176485. 9

3, 2,1 201502. 5 Si iv (

2 S*) Limit 269940. 6

July 1947.

Si m Observed Terms*

Config.

Is2 2s2 2

p

6

3s2

3s(2 S)3p

3p

2

3s(2 S)na;

3p(2 P°)np

Observed Terms

3s2 iS

{

3p 3 P°

3p 3 P°

{ 3p2 J S

3p2 3 P

3p2 »D

ns (w> 4) np (n> 4) nd (n> 3) nf (n> 4) ng (n> 5)

/4,5s 3 S

\4, 5s iS 4p 3 P°

4p ip°

3, 4d 3 D

3, 4d 3 D

4/ 3 F° 5, 6<7 3 G

4s 3 P° 4p 3 P 3d 3 P° 3d 3 D°

*For predicted terms in the spectra of the Mg i isoelectronic sequence, see Introduction.
150 SEE REVISION IN NSRDS-NBS 3, Section 1, June 1965.

Si IV

(Na i sequence; 11 electrons) Z=14

Ground state Is2 2s2 2p* 3s 2S^

3s 2S^ 364097.7 cm-1

I. P. 45.13 volts

The first detailed analysis by Fowler was extended and improved by Edlen and Soderqvist,

who observed the spectrum from 815 A to 4328 A. The terms have been taken from their

paper, extrapolated values being entered in brackets. They estimate the accuracy of the

limit as probably within 2 or 3 cm-1

. One additional term, 8/

2F°, has been taken from Fowler’s

paper and corrected slightly to agree with the rest. The observations by McLennan and Shaver extend to the violet limit 458 A and those by

Millikan and Bowen extend to 361 A.

REFERENCES

R. A. Millikan and I. S. Bowen, Phys. Rev. 23, 1 (1924). (C L)

J. C. McLennan and W. W. Shaver, Trans. Roy Soc. Canada [3] 18, Sec III p. 14 (1924). (C L)

A. Fowler, Phil. Trans. Roy. Soc. (London) [A] 225, 38 (1925). (T) (C L)

B. Edl6n and J. Soderqvist, Zeit. Phys. 87, 217 (1933). (I P) (T) (C L)

Si IV Si IV

Config. Desig. J Level Interval Config. Desig. J Level Interval

3s 3s 2 S X 0. 0 6d 6d 2 D 1 X

2/ 313923. 4

3V 3p

2 P° X 71289. 6

460. 3

1/2 71749. 9 6/ 6/

2 F° 2/

3/ 815231. 6 3d 3d 2 D 1 /

2/2 160376. 8

69 60 2 G

1 3X

X | 315306.

4s 4s 2 S X 193981. 5 4p 4v

2 P° Vj 218269. 5

161. 8

6h 6h

2 H° r 4/

l 5/ } 315820.

1/2 218481. 8

7s 7s 2 S X 318744. 5 4d 4d 2 D 1/2 2/2 250010. 6 7P 7V

2 P° X

1/2 [822847]

4/ 4/ 2 F° 2/2

3/2 254129. 4 254130. 7

1. 3 7d 7d

2 D 1/2 2/ [327369]

5s 5s 2 S X 265420. 4

7/ 7/ 2 F° 2/

5p 5p 2 P° X 276506. 5

75. 3 3/ 828201. 5

1/2 276581. 8

5d 5d 2 D 1/2 7g 7g 2 G

f 3H

X 4^ | 328251. 7

2/2 291499. 2

5/ 5/ 2 F° 2/ 7h 7h

2H° r 4xt 1 5/ |

828262

3/

r 3/2

1 4/

298721. 0

8/ 8/ 2F° r 2K

l 3H \ [386619] 5g 5g2 G

| 293839. 7

J

6s 6s 2 S X 299679. 6

Si v 0S0) Limit 364097. 7

6p 6p 2 P° X 805645 43

1/2 805687. 6

June 1947.
151

Si y

(Ne i sequence; 10 electrons) Z=14

Ground state Is2 2s2 2

p

6 X S0

2p

6 % 1345100 cm"1 I. P. 166.73 volts

The analysis is by Ferner, who has extended the early work by Soderqvist. Thirteen

lines have been classified in the region 78 A to 118 A, as combinations with the ground term.

Ferner’s term designations assigned on the assumption of ZS'-coupling are given under

the heading “Author” in the table.

As for Ne i, the jY-coupling notation in the general form suggested by Racah is introduced.

The unit used by Ferner, 103 cm-1

, has here been changed to cm-1

. REFERENCES

E. Ferner, Ark. Mat. Astr. Fys. (Stockholm) 28A, No. 4 p. 4 (1941). (I P) (T) (C L). G. Racah, Phys. Rev. 61, 537 (L) (1942).

Si y

Author Config. Desig. j Level

2p !S 2p

8 2p® J S 0 0

2p8 (

2Pl*)3s 3s [i y2y 2

3s 3Pi 1 840560

2p5 (

2P£)3s 3s' [ y2]° 0

3s !Pi 1 848460

2p5

(2P!^)3d 3d [ y2]° 0

3d 3 Pj 1 1018240

3d iPj // 3d [i y2]° 1 1029410

3d 3Di 2p8

(2P£)3d 3d'[iy2]° 1 1036930

2p 8 (

2Pi*)4s 4s [i y2]° 2

4s *Pi 1 1100690

2p5

(

2 P£)4s 4s' [ y2 ]° 0

4s *Pi 1 1105550

Si v

Author Config. Desig. J Level

4d *P! 2p5(2P!*)4d 4d [1 y2]° 1 1168550

4d 3D! 2p5 (

2 P£)4d 4d'[iy2]° 1 1174050

5d iPj 2p®(2 P!*)5d 5

d

[i y2]° 1 1232850

5d 3 Dj 2ps

(

2P£)5d 5d'[iy2 ]° 1 1237520

6d iPi 2p®(2Pi*)6d 6d [i y2y 1 1267380

6d 3 Di 2p®(2P£)6d 6d'[iy2]° 1 1272090

Si vi (

2 P!h) Limit 1345100

Si vi (

2P£) Limit 1350200

April 1947.
Si v Observed Levels*

Config.

Is2 2s2 +

Observed Terms

2p6 2

p« iS

ns ( n> 3) nd (n> 3)

2p 5 (

2 P°)na; / 3, 4s 3 P°

\ 3, 4s ip°

3d 3 P° 3-6d 3 D°

3-6d 4 P°

jl- Coupling Notation

Observed Pairs

ns (n> 3) nd (n> 3)

2p5

(

2 Pfo)nx 3, 4s [134]° 3d [ y2 ]° 3-6d [iy2 ]° 2p5

(

2 P£)nx' 3, 4s' [ y2]° 3-6d' [1 y2 ]°

*For predicted levels in the spectra of the Ne I isoelectronic sequence, see Introduction.

Si vi

(F i sequence; 9 electrons) Z= 14

Ground state Is2 2s2 2p5 2P°W

2p

6 2P°iy2 1654800 cm-1

I. P. 205.11 volts

The terms are from Ferner’s paper. He has extended the earlier analysis by Soderqvist

to include 63 classified lines in the range between 65 A and 249 A. All but two of the observed

combinations are with the ground term. According to Ferner some of the term assignments

are somewhat uncertain. The unit adopted by Ferner, 103 cm-1

, has here been changed to cm-1

. By analogy with related spectra in the isoelectronic sequence Robinson has suggested

the following changes in Ferner’s term assignments:

Ferner Robinson Ferner Robinson

3d 4 F2^$ 3d 4 P2^ 3d' 2 S* 3d' 2 P1H 3d 3d 2 D2x 3d' 2 P1H 3d' 2 D1H 3d 2 D2^

4d 4 F2^

3d 2 F2j* 4d 2 D2H 4d 4 P2^*

3d' 2 D2*

2 D1h 3d' 2 F2H

3d' 2 F2H 3d' 2 S*

3d' 2 D2H 4d' 2 SH

** 4d 2 D2^ 4d 2 D1H

2 D1h 4d 2 P1H 4d' 2 S* 4d' 2 P1H 4d' 2 D2H 4d' 2 D

2 Dih 4d' 2 P^***

*1401250. **1446330. ***1445500.

REFERENCES

E. Ferner, Ark. Mat. Astr. Fys. (Stockholm) 28A, No. 4, p. 5 (1941). (I P) (T) (C L)

H. A. Robinson, unpublished material (March 1948). (T) (C L)
153

Si VI Si vi

Config. Desig. J Level Interval Config. Desig. J Level Interval

2s2 2p5 2p5 2po 1 X

X

0

5100 -5100 2s2 2p4

(

3 P)4s 4s 2P 1329900

2s 2p

6 2p® 2 S y2 406500

2s2 2p4

(

4 D)4s 4s' 2 D

|

1371820

2s2 2p4 (

3 P)3s 3s 4P 2^2 990460 -3180 ix

X

993640 2s 2p6 (

3 P°)3s 3s'" 2P° !X

X

18758AO 1878880 -2990

2s2 2p4

( 3P)3s 3s 2P ix 1005440 -3700 2s2 2p4

( 3P)4d 4d 4 F 454 X 1009140 3/2

2/2 1399110 -340

2s2 2p4 (*D)3s 3s' 2D 2/2

1 X

1041450

1041500 -50 1 X 1399450

2s2 2p4 (

3 P)4d 4d 4P X

2s2 2p4

(

! S)3s 3s" 2 S X 1094460 ix

2}i

1400880

1401740 860

2s2 2p4 (

3 P)3d 3d 4 F 4/4 3H 2s2 2p4

(

3 P)4d 4d 2 P X 1402510 3820

2Vi

1/2 1193290

1194330 -1040 ix 1406330

2s2 2p4 (

3 P)4d 4d 2 D ix 1403050 1820

2s2 2p4

( 3 P)3d 3d 4 P >4 IX

1194970

1196040 1070

1190

2Vt 1404870

2/2 1197230 2s2 2p4 (

4 D)4d 4d' 2 S X 1444340

2s2 2p4 (

3 P)3d 3d 2 P X

ix

1200720 4020 2s2 2p4

(

4 D)4d 4d' 2 D 2X 1445000 -590 1204740 ix 1445590

2s2 2p4

(

3 P)3d 3d 2 D ix 1201100 1860 2s2 2p4 (

4 D)4d 4d' 2P X

2X 1202960 IX 1445030

2s2 2p4 (*D)3d 3d' 2 P X 1239200 3190 2s2 2p4 (

4 S)4d 4d" 2 D 2X 1497100

1/2 1242390 IX

2s2 2p4

(

4 D)3d 3d' 2 S X 1241060 2s2 2p4

( 3 P)5d 5d 2 D ix

2/2 1497630

2s2 2p4 (*D)3d 3d' 2 D 2x 1242220 -1640 ix 1243860 2s2 2p4

(

4 D)5d 5d' 2 S X 1538370

2s2 2p4 (*D)3d 3d' 2 F 3X 2s2 2pOD)5d 5d' 2 P X

2

1243020 ix 1538580

2s2 2p4

(

4 S)3d 3d" 2 D 2M

1 X

1291510 -290 1291800

Si vii ( 3P2) Limit 1654800

2s2 2p4

(3P)4s 4s 4 P 2x

1/2 1322980

X

March 1948.

Si vi Observed Terms*

Config.

ls2 +

Observed Terms

2s2 2p5 2p5 2p°

2s 2p« 2p« 2 S

ns (n> 3) nd (n> 3)

/ 3, 4s 4 P 3, 4d 4 P 3, 4d 4 F

2s2 2p4 (

3 P)nx

\ 3, 4s 2P 3, 4d 2 P 3-5d 2 D

2s2 2p4 (

1 D)m:' 3, 4s' 2 D 3—5d' 2S 3-5d' 2 P 3, 4d' 2 D 3d' 2 F

2s2 2p4

(

1 S)nx" 3s" 2 S 3, 4d" 2 D

2s 2p5

(

3 P°)nx'" 3s'" 2 P°

For predicted terms in the spectra of the F i isoelectronic sequence, see Introduction.
154

Si vii

(Oi sequence; 8 electrons) Z=14

Ground state Is2 2s

2 2p4 3P2

2

p

4 3P2 1988000 cm"1 I. P. 246.41 volts

In 1941 Ferner published an analysis of this spectrum including 71 classified lines—64 in

the region between 54 A and 85 A and 7 between 217 A and 278 A. The present term list is, however, based on later work kindly furnished by him in manuscript form.

Two intersystem combinations have been observed, connecting the triplet and singlet

terms.

Ferner’s unit, 103 cm-1

, has here been changed to cm-1

. REFERENCES

E. Ferner, Ark. Mat. Astr. Fys. (Stockholm) 28A, No. 4 p. 3 (1941). (T) (C L) E. Ferner, Ark. Mat. Astr. Fys. (Stockholm) 36A, No. 1, p. 48 (1948). (I P) (T) (C L)

Si VII Si vii

Config. Desig. J. Level Inter- val

Config. Desig. J. Level Inter- val

2s2 2p* 2pi 3P 2

10

0

4030

5570

-4030

-1540

2s2 2p3

(

2 D°)3d 3d' 3D° 3

2

1

1428020

1428090 -70

2s2 2p* 2p

4 4 D 2 47000 2s2 2p3

(

2 D°)3d 3d' ip° 1 1429680

2s2 2p* 2p* *S 0 99780 2s2 2p3

( 2 D°)3d 3d' 3P° 2

1 1435460

1436750 -1290

-340

2s 2

p

5 2p5 3po 2

10

86 170

866780

868760

-3610

-1980

2s2 2p3

( 2D°)3d 3d' 4 D°

0

2

1437090

1436760

2s

2 2p5 2p

5 ipo 1 506080 2s2 2j; 3

(

2 D0)3d 3d' 3 S° 1 1441280

2s2 2p3

(

4 S°)3s 3s 3 S° 1 1178470 2s2 2p3

(

2 D°)3d 3d' 1 F° 3 1447870

2s2 2p3

(

2 D°)3s 3s' 3 D° 1,2,3 1225150 2s2 2p3

(

2 P°)3d 3d" 3 P° 0 1460290 570

1000

1 1460860

2s2 2p3

(

2 D°)3s 3s' 1D° 2 1286320 2 1461860

2s2 2p3 (

2P°)3s 3s" 3p° 0 2s2 2p3

( 2P°)3d 3d" 3 F° 4

1 1261610 430 3 1468270 -3220 2 1262040 2 1466490

2s2 2p3

(

2 P°)3s 3s" ipo 1 1273170 2s2 2p3

(

2 P°)3d 3d" >D° 2 1466910

2s2 2p3

(

4 S°)3d 3d 3 D° 1,2 1867360 200 2s2 2p3

( 2P°)3d 3d" 3 D° 3 1467390 -2660 2,3 1867560 2

1 1470050

2s2 2p3 (

2 D°)3d 3d' 3F° 4

3

o 1426050 2s2 2p3

(

2 P°)3d 3d" iP° 1 1470490

2s2 2p3

(

2 P°)3d 3d" 1 F° 3 1474100
155

Si VII—Continued Si VII—Continued

Config. Desig. J. Level Inter- val

Config. Desig. J. Level Inter- val

2s 2p4 (

4 P) 3s 3s'" 3 P 2

1 1499430 2s 2 2p3

(

2 D°)4d 4d' X F° 3 1714610

0 2s2 2p3

(

2 P°)4d 4d" 3 p° 0

1 2s 2p4 (

2 D)3s 3sIV 3 D 3

o 1590930 2 1741180

i 2s2 2p3

(

2P°)4d 4d" 3 D° 39 1744440

2s2 2p3

(

2 D°)4s 4s' 3 D° 1, 2, 3 1681160 1

2s2 2p3

(

2 D°)4s 4s' ip>° 2 1685820 2s2 2p3 (

2 P°)4d 4d" X F° 3 1748200

2s2 2p3 (

4 S°)4d 4d3 D° 1 2s2 2p3

(

4S°)5d 5d

3 D° 1 2,3 1648740 2,3 1769040

2s2 2p3(2p°)4s 4s" 3 po 0 2s 2 2p3

(

2 D°)5d 5d' 3 d° 3,2 1834120

1 1 2 1669900

2s2 2p3

( 2 D°)5d 5d' 3 p° 2 1836140

2s2 2p3 (

2 D°)4d 4d' 3D° 3,2 1707070 1

1 0

2s2 2p3 (

2 D°)4d Ad' ipo 1 1707550 2s 2p4 (

4 P)4s 4s'" J P 2

1 1887680

2s2 2p3 (

2 D°)4d Ad' 3po 2

10

1711010 0

2s2 2p3

(

3 D

0 )4d Ad' 3 S

° 1 1712680 Si viii (

4 S!v*) Limit 1988000

February 1947.

Si vii Observed Terms*

Config.

ls 2 +

Observed Terms

2s2 2

p

4 {2p4 X S

2p

4 3 P

2

p

4 X D

2s 2p5 {

2p5 3 p°

2

p

5 X P°

ns (n> 3) nd (n> 3)

2s2 2p3 (

4 S°)nx 3s 2 S° 3-5d 3 d°

2s2 2p3 (

2 D°)nx'

{

3,4s' 3 d°

3,4s' X D°

3, Ad' 3S° 3-5d' 3 P° 3-5d' 3 D°

3,4d' X P° 3d' X D°

3d' 3p°

3, 4d' X F°

2s2 2p3 (

2 P°)na:"

{

3,4s" 3 p°

3s" X P°

3, 4d" 3 p° 3( 4d" 3 D°

3d" X P° 3d" X D°

3d" 3 F°

3, 4d" X F°

2s 2p4

(

4 P)nz'" 3, 4s'" 3 P

2s 2p4 (

2 D)nxIV 3sIV 3D

*For predicted terms in the spectra of the O i isoelectronic sequence, see Introduction.
156

Si ym

(N i sequence; 7 electrons) Z=14

Ground state Is2 2s2 2p

z 4Sj^

2p

z 4S^ 2451570 cm-1

I. P. 303.87 volts

The terms published by Femer in 1941 have been corrected as indicated in his 1948 paper.

The absolute values of the quartet terms have been decreased by 250 cm-1

; those of the doublet

terms increased by 250 cm-1 as compared with the values he published in 1941.

Fifty-nine lines have been classified, all but 13 of which are in the region between 49 A

and 76 A. No intersystem combinations have been published and the uncertainty, x, may be

considerable.

The unit adopted by Ferner, 103 cm-1

, has here been changed to cm-1

. REFERENCES

J. Soderqvist, Nova Acta Reg. Soc. Sci. Uppsala [IV] 9, No. 7, 64 (1934). (T) (C L)

E. Ferner, Ark. Mat. Astr. Fys. (Stockholm) 28A, No. 4, p. 6 (1941). (I P) (T) (C L) E. Ferner, Ark. Mat. Astr. Fys. (Stockholm) 36A, No. 1, p. 42 (1948).

Si VIII Si vm

Author Config. Desig. J Level Interval Author Config. Desig. J Level Interval

2p 2s2 2p3 2p3 4/S° 1 H 0 3d 2 D2 2s2 2p2

( 3 P)3d 3d 2 D ix 1657290+x 1170 2 D3 2/2 1658460+z

2p

2 D2 2s2 2p3 2p 3 2D° 1/2 67140-\-x

2 280 d3 2/ 674%0+x 3d 2 F4 2s2 2p2 0D)3d 3d' 2p 3/2 1682560+x -220 2F3 2X 1682780+x

2V

2Pi 2s2 2p3 2p3 2po / 103820+x

2 580 P2 1/ 108900+x 3d 2 D2 2s2 2p2

(

4 D)3d 3d' 2 D IX 1683930+x 1630 2d3 2/2 1685560+x

2

p' 4P3 2s 2p4 2p4 4P 2/2 312670 -3590

-1900

4P2 1/2 316260 3d 2PX 2s2 2p2 0D)3d 3d' 2P /2 1694560+x 1580 4Pi /2 318160 2P2 ix 1696140+x

2

p' 2 D3 2s 2p4 2p4 2 D 2/ 428300+z -60 f X 1 2d2 1/2 428360+x 3p' 4P 2s 2p3

(

5S°)3p 3p'" 4P 1 to 1698230

l 2/2 J 2

p' 2S1 2s 2p4 2p4 2S / 502360+x

3d 2Si 2s2 2p2

(

x D)3d 3d' 2S X 1701700+x

2

p' 2 P2 2s 2p4 2p4 2p 1/ 528420+x -4370

f X

2Pi / 532790+x I 3d' 4 D 2s 2p3

(

5S°)3d 3d'" 4 D° ( to 11801710

3s 4Pj 2s2 2p2

(

3 P) 3s 3s 4P / 1430510 2360

3250

[ 3/2 I

4 P2

4P3 1/2 2/

1432870

1436120 2s2 2p2

( 3P) 4s 4s 2 P X

4s 2 P2 1/2 1927190+x

3s 2 Pj 2s 2p2

(

3 P) 3s 3s 2p /2 1447950+x 3950

2/2 2 P2 1/2 1451900+x 4d 2 F3 2s2 2p2

( 3 P)4d 4d 2F 1996930+x 4050 2 F4 3/2 2000980 +x

3s 2 D2 2s2 2p2 (iD)3s 3s' 2 D 1/2 1486120+x 590 2X 2 D3 2/ 1486710+x 4d 4 P3 2s2 2p2

(

3 P)4d 4d 4P 1999240 -1280 4p2 1/2 2000520

3d 2 P2 2s2 2p2

(

3P)3d 3d 2p VA

/

1622900+x X

2s2 2p2

(

3P)4d 4d 2 D 1/2

3s' 4S2 2s 2p3

(

5S°)3s 3s'" 4S° 1/2 1628660 4d 2D3 2/2 2006710+x

3d 2f3 2s2 2p2

(3 P)3d 3d 2p 2y2 1632010+x 4480 4d 2 D3 2s2 2p2 (

x D)4d 4d' 2 D ix

2F4 3d 4 D

3/

3/

( 2/2 1 1/2

/2 2/

1636490+x 2/2 2046680 +x

2s2 2p2

(

3P)3d

3d 4D82 } 1633370 Si rx (

3P0) Limit 2451570

3d 4P3 2s2 2p2 (

3P)3d 3d 4P 1637470 -1360

-810

4p2

4Pi

iX

X

1638830

1639640

July 1948.
Si yin Observed Terms*

Config.

1 s

2 +

Observed Terms

2s* 2p* |2p

3 4 S°

2p3 2po 2p3 2 D°

2s 2

p

4 {2

p

4 2 S 2p4 4 P

2p4 2 P 2

p

4 2 D

ns (n> 3) np (n> 3) nd (n> 3)

2s2 2p2

(

3 P)nx

{

3s 4 P

3,4s 2 P

3, 4d 4 P 3d 4 D

3d 2 P 3, 4d 2 D 3, 4d 2 F

2s2 2p2

(

1 T))nx' 3s' 2 D 3d' 2 S 3d' 2 P 3, 4d' 2 D 3d' 2 F

2s 2p3

(

5 S

0 )nx'" 3s'" 4 S° 3p'" 4 P 3d'" 4 D°

*For predicted terms in the spectra of the Ni isoelectronic sequence, see Introduction.

Si IX

(Ci sequence; 6 electrons) Z=14

Ground state Is2 2s2 2jp

2 3P0

2p

2 3P0 2838460 cm-1

I. P. 351.83 volts

The terms have been taken from a manuscript by Femer who generously submitted

his revised analysis in advance of publication. A total of 42 lines have been classified, all but two of which are in the region between 44 A and 65 A. No combinations involving the

terms 2p3D° and 2pz X P

0 are listed. The systems of terms of different multiplicity are not connected by intersystem combinations. Their relative positions are estimated by extrapolation along the isoelectronic sequence.

The uncertainties, x and y, may be considerable.

Ferner’s unit, 103 cm-1

, has here been converted to cm-1

. REFERENCES

E. Femer, Ark. Mat. Astr. Fys. (Stockholm) 28A, No. 4 p. 6 (1941). (T) (C L)

E. Ferner, Ark. Mat. Astr. Fys. (Stockholm) 36A, No. 1, p. 37 (1948). (I P) (T) (C L)
158

Si IX Si IX

Author Config. Desig. J Level Inter- val Author Config. Desig. J Level Inter- val

2

p

3 P0 2s2 2p2 2p

2 3 P 0 0 2590

3870

3d X F3 2s2 2p(2 P°)3d 3d iF° 3 1837810+x

3 Pi

3 P2

12 2590

6460 3d !P! 2s2 2p(2 P°)3d 3d ipo 1 1888540+

2p

X D2 2s2 2p2 2p

2 X D 2 52960 +

3p' 3 SX 2s 2p2

(4 P)3p 3V

3 S° 1 1858590

2p !S0 2s2 2p2 2p

2 X S 0 107780+

2s 2?? 2

(

4 P)3x> 3p 3 D° 1 3p' 3 D2 2 1896170

2870 2p' 5 S2 2s 2p3 2p

3 5 g

° 2 150010 +y 3 d3 3 1899040

2p' 3 D3 2s 2p3 2p

3 3D° 3 292210 -150

-80

3s' 3 D 2s 2p2

( 2 D)3s 3s' 3 D 1, 2,3 1917080

3 d2

3 D,

2

1 292860

29244-0 3d' 3P3 2s 2p2

(

4 P)3d 3d sp 3 1971270 + p -1230

3po -960

5 P2 2 1972500 + p

2p' 3 P 2s 2p3 2p3 2, 1,0 844080 5Pi 1 1973460 +

y

2p' X D2 2s 2p3 2p3 iD° 2 440410+

3d' 3 P2 2s 2p2

(

4 P)3d 3d 3 P 2

1 1973940

2p' 3 Si 2s 2p3 2p

3 3 S° 1 446980 0

2p' x Pi 2s 2p3 2p3 ipo 1 492820+

3d' 3 F2 2s 2p2 (

4 P)3d 3d 3 F 2 1985150 2010

2670

3 f3 3 1987160

2s2 2p(2 P°)3s 3s 3 po 0 3 f4 4 1989830

3s 3 P

3 P2

12 1628880

1628550 5170

3

p' X F3 2s 2p2

( 2 D)3p 3p' ipo 3 1999980+

3s »Pi 2s2 2p(2 P°)3s 3s ipo 1 1640920 +x 3

p' 2 2s 2p2

(

2 D)3p 3p' 1 D° 2 2009410 +x

3s' 3 P

2s 2p2

(

4 P)3s 3s 6P 1 1784260 +

y

2170

3220

2s 2p2

(

4 P) 3d 3d 3 D 1

5P2 2 1786430 +

p

3d' 3 D32 2,3 2011690

5 p3 3 1789650 + y 3d7 3 F 2s 2p2

(

2 D)3d 3d' 3 F 2, 3,4 2084940

3d 3 F2 2s2 2p(3 P°)3d 3d 3p° 2 1789400+x

3

A 3d' 3 D 2s 2p2

(

2 D)3d 3d' 3 D 1,2,3 2093650

3d' 3 F 2s 2p2

( 2 P)3d 3d'" 3 F 2, 3, 4 2190790

3d X D2 2s2 2p(2 P°)3d 3d >D° 2 1794090+x

2s2 2p(2 P°)4d 4d 3 D° 1 3d 3 Di 2s2 2p(2 P°)3d 3d 3 D° 1 1808160 920

2400

4d 3 D2 2 2264870 2130 3 D2 2 1809080 3 D3 3 2266400

3 D3 3 1811480

3d 3 P2 2s2 2p(2 P°)3d 3d 3p° 2 1815690 -1250

-730

3 Pi

3 Po

1 1816940

1817670

Si x (

2 P+> Limit 2838460

0

March 1948. Si Ix Observed Terms*

Config.

ls 2 +

Observed Terms

2s2 2p2 {2p2 X S

2

p

2 3 P

2

p

2 X D

2s 2p3

f 2p3 3 S°

2p3 3 S° 2

p

3 3 P°

2p

3 X P°

2p3 3 D°

2p

3 >D°

ns (n> 3) np (n> 3) nd (n> 3)

2s2 2p(2 P°)nx

{

3s 3 P°

3s X P°

3d 3 P°

3d X P°

3, 4d 3 D°

3d X D°

3d

3d

3 po

ipo

2s 2p2 (

4 P)nx

{

3s 6P

3p 3 S° 3p 3D°

3d 5 P

3d 3 P 3d 3 D 3d 3 F

2s 2p2

( 2 D)wx' 3s' *D

3p' X D° 3p' X F°

3d' 3 D 3d' 3 F

2s 2p2 (

2 P)nx'" 3d'" 3 F

For predicted terms in the spectra of the C i isoelectropic sequence, see Introduction.
159

Si X

(B I sequence; 5 electrons) Z=14

Ground state Is2 2s2 2p

2P

2p 2P^ 3237400 cm"1 I. P. 401.3 volts

Femer has classified 29 lines in the range between 47 A and 57 A. He has kindly furnished

his unpublished manuscript extending the analysis he published in 1941.

No intersystem combinations have been observed, as indicated by x in the table, but the

absolute values of the doublet and quartet terms are determined from series. Extrapolated

values are in brackets in the table.

The quartet terms are not all connected by observed combinations.

Ferner’s unit, 103 cm-1

, has here been changed to cm-1

. REFERENCES

E. Femer, Ark. Mat. Astr. Fys. (Stockholm) 28A, No. 4, p. 18 (1941). (T) (C L) E. Ferner, Ark. Mat. Astr. Fys. (Stockholm) 36A, No. 1, p. 30 (1948). (I P) (T) (C L)

Si X Si x

Author Config. Desig. J Level Interval Author Config. Desig. J Level Interval

2V

2Pi 2s2

(

1 S)2p 2p2P° Y 0

6990 2s 2p(3 V°)3p 3v

2D ix

2 P2 i X 6990 3p' 2 D3 2y2 2110260

2p' 4 Pi

4P2 2s 2p2 2p

2 4 P Y

i X

162060+x

164500+x 2440

3590

3d' 4d12 2s 2p{3 0°)3d 3d 4 D° f y2 t 1/2 ^2151950-Ox

420

4 Ps 2y2 168090+x 4 d3 2/ 2152370-Ox 2490

{ ix

l 2/

4 d4 3/ 2154860+x

2p' 2D 2s 2p

2 2p

2 2 D

}

287830 3d' 2 d2 2s 2p(3P°)3d 3d 2 D° 1 X 2153680 760

2p' 2 Si

2 d3 2/ 2154440

2s 2p

2 2p

2 2 S % 367650

2p' 2 Pi 2s 2p

2 2P y2 3

s' 2 p 2s 2p(1 P°)3s 3s' 2 po I X. }2158290

2p

2 389740 4260 1 1 X

2P2 i X 394000

3d' 4P3 2s 2p(3 P°)3d 3d 4po 2/ 2161950-Ox

2p" 4 S2 2p3 2p3 4 S° i y2 510190-Ox 1/

/

2p" 2 d3

2 d2 2p3 2p3 2 D° 2/

i X

674360

674600 -240 3d' 2f3 2 f4 2s 2p{3~P°)3d 3d 2p° 2/

3/

2188570

2193140 4570

2p" 2 P1 2p

3 2pi 2p° y2 [644660] 380 3d' 2 P2 2s 2p(3 P°)3<2 3d 2 po 1 X 2199190

2 -2580 P2 i X [644940] 2 P1 y2 2201770

3d 2 d2

2 d3 2s2 OS) 3d 3d 2 D IX

2/

1979260

1979730 470 3d' 2 F 2s 2pOV°)3d 3d' 2po

3X | 2299860

3s' 4P1

4P2 2s 2p(3 P°)3s 3s 4P° y2 ix

1998860+x

19961 80 +x 2320

4390

3d' 2 D2

2 d3 2s 2p(1 P°)3d 3d' 2 D° 1/2 2/2 2310230

2311360 1130

4p3 2/4 2000570 +x 3d" 4 p3 2p2

( 3 P)3d 3d" 4 P 2/ 2445320 -1540

3s' 2s 2p(3 P°)3s 3s 2 P° y2

4 p2 IX

y2 2446860 +x

2 P2 i y 2035810

3V’

2P2 2s 2p(3 P°)3p 3p

2 P X

IX 2066600 Si XI CSnl Limit 3237400

August 1947.
Si x Observed Terms*

Config.

ls2 +

Observed Terms

2s2

(

1 S) 2p 2p2 P°

2s 2

p

2 {2p

2 2 S

2

p

2 4 P

2

2 2P 2

p

2 2 D

2pl |2

p

3 4S° 2p

3 2 P° 2p3 2 D°

ns (n> 3) np (n> 3) nd (n> 3)

2s2

(

1 S)nx 3d 2 D

2s 2p(3 P°)nx

{

3s *P°

3s 2 P° 3p

2 P 3p 2 D

3d 4 P°

3d 2 P°

3d <D°

3d 2 D° 3d 2 F°

2s 2p( 1 P°)nx' 3s' 2 P° 3d' 2 D° 3d' 2 F°

2p2

( 3 P)nx" 3d" «P

*For predicted terms in the spectra of the B i isoelectronic sequence, see Introduction.

Si XI

(Be i sequence ; 4 electrons) Z= 14

Ground state Is2 2s2

2s2 3840470 cm-1I. P. 476.0 volts

Ferner has published a preliminary analysis giving the classifications of 12 lines in the

region between 43 A and 49 A. He has recently extended the earlier work and generously

furnished his revised term list in advance of publication, to be used in compiling the list below.

No intersystem combinations have been observed, as indicated by x in the table.

The unit adopted by Ferner, 103 cm-1

, has here been changed to cm-1

. REFERENCES

E. Ferner, Ark. Mat. Astr. Fys. (Stockholm) 28A, No. 4 p. 20 (1941). (T) (C L)

E. Ferner, Ark. Mat. Astr. Fys. (Stockholm) 36A, No. 1, p. 27 (1948). (I P) (T)
161

Si XI Si XI

Author Config. Desig. J Level Inter- val Author Config. Desig. J Level

2s ‘So 2s2 2s2 ‘S 0 0 3d ‘D2 2s (

2 S) 3d 3d ‘D 2 2361010

2p 3 P0 2s(2 S)2p 2V

3 P° 0 169140+x 2420 2p(2 P°)3p 3p 3 D 1

3 Pi 1 171560+

xoxn 2 *P2 2 176810+x 3p' 3 D3 3 2486810 +£

2p 'Pi 2s(2 S)2p 2p ‘P° 1 829400 3d' ‘D2 2p(2 P°)3d 3d >D° 2 2523240

2

p' 3 Po 2p

2 2p2 3 P 0 443020 +x ofion 3p' ‘D2 2p(2 P°)3p 3p ‘D 2 2532140

3 Pi 1 4459 10 +re a

3 P2 2 450470 +x 2p(2 P°)3d 3d 3 D° 1 3d' 3 D2 2 2546810+x

2

p' ‘D2 2p

2 2

p

2 ‘D 2 493400 3 d3 3 2548970 +x

2p' % 2p

2 2p2 ‘S 0 607630 CO 2p(2 P°)3d 3d 3 P° 2

i 2556220 +x

3s % 2s(2 S)3s 3s ‘S 0 2241480 0

3p ‘Pi 2s(2 S)3p 3p ‘P° 1 2285040 CO + & 2p(2 P°)3d &o

-e 1

CO 3 2581180

2s (

2 S) 3d 3d 3 D 1 3d »D2 2 2331390 +1

3 d3 3 2331940 +x Si xii (

2 S>$) Limit 3840470

August 1947.

Si xi Observed Terms*

Config.

ls 2 +

Observed Terms

2s2 2s2 ‘S

2s(2 S)2p

{

2p

3 P°

2p ‘P°

2p

2 { 2

p

2 ‘S 2p2 3 P

2p2 ‘D

ns (n > 3) np (n> 3) nd (> 3)

2s(2 S)nx

ri 3s ‘S 3p ‘P° 3d 3 D

3d ‘D

2p(2 P°)nx

{

3p 3 D

3p ‘D

3d 3 P° 3d 3 D°

3d ‘D° 3d ‘F°

*For predicted terms in the spectra of the Be i isoelectronic sequence,

see Introduction.
(Li i sequence; 3 electrons) Z=14

Ground state Is2 2s 2 S^

2s 2S^ 4221460 cm'1 I. P. 523.2 volts

The classifications of three lines in the region 44 A to 45 A were published by Ferner in

1941, but no terms were given. His absolute term values based on later work, and kindly

furnished in advance of publication, have been used in compiling the present list. Observations of the resonance lines have not been reported.

Ferner’s unit, 103 cm-1

, has here been changed to cm-1

. REFERENCES

E. Ferner, Ark. Mat. Astr. Fys. (Stockholm) 28A, No. 4 p. 21 (1941). (C L)

E. Ferner, Ark Mat. Astr. Fys. (Stockholm) 36A, No. 1, p. 25 (1948). (I P) (T)

Si XII

Config. Desig. J Level Interval

2s 2s 2 S X 0

2V 2p 2 P° X

i X

191900

200290 8390

3s 3s 2 S X 2390580

3d 3d 2 D ix 2463540

2464530 990

Si xm OSo) Limit --- 4221460

August 1947.
163

PHOSPHORUS

Pi

15 electrons Z=15

Ground state Is2 2s2 2_p

6 3s2 3^3 4S°^

3p

3 4S°^ 88560 cm-1

I. P. 11.0 volts

Eleven terms have been found by Kiess, who extended earlier work on this spectrum by

making the important observations in the infrared to 10813 A. Robinson observed the ultraviolet region as far as 1323 A and was able to extend the analysis.

The present bst is taken from Robinson’s paper, except for the term 4p

2P°, which has been

adjusted to fit the observations by Kiess.

Intersystem combinations connecting the doublet and quartet terms have been observed.

There is not complete agreement about the configuration assignments of 3d

2P and 3p4 2P,

and those entered in the table are tentative.

REFERENCES

C. C. Kiess, Bur. Std. J. Research 8, 393, RP425 (1932). (I P) (T) (C L)

H. A. Robinson, Phys. Rev. 49, 297 (1936). (I P) (T) (C L)

W. F. Meggers, J. Opt. Soc. Am. 36, 431 (1946). (Summary hfs) Pi Pi

Config. Desig. J Level Interval Config. Desig. J Level Interval

3s2 3

p

3 3

p

3 4 S° i H 0. 0 3s2 3p2

(

3 P)4p 4p 2 P° X

1/2 67971. 1 68088. 3

117. 2

3s2 3

p

3 3p 3 2 D° iy2 11861. 7

14. 8

2

y

2 11376. 5 3s2 3p2

(

3 P)4p 4p2 S° X 68473. 2

3s2 3

p

3 3p3 2po x 18722. 4 25. 7

3s2 3p2

( 3 P)3d 3d 2 F 2^ 70391. 3

298. 7

i X 18748. 1 3X 70690. 0

3s2 3p2

(

3 P)4s 4s 4P x 55939. 23

151. 36

249. 09

3s2 3p2

(

3P)3d 3d

4 D X

IX

2x

56090. 59

56339. 68

IX

2X

3X

70637. 5

70778. 6

141. 1

3s2 3p2

(

3P)4s 4s 2P X 57876. 8

297. 6

i X 58174. 4 3s 3

p

4 3p4 2 D 2y2 iX

71168. 3

71202. 6 -34. 3

3s 3p4 3p4 4P 2/2 59533. 4 -180. 2 - 105. 0 ix 59713. 6 3s2 3p2

(

3P)3d 3d 4 P 2% 72386. 6 — 108 0 X 59818. 6 iX 72494. 6 -76. 8 X 72571. 4

3s2 3p2

(

1 D)4s 4s' 2 D I IX

l %x } 65156. 6

3s2 3p2

(

3P)3d 3d 2 P X 72741. 9

141. 6 ix 72883. 5

3s2 3p2

(

3P)4p 4p 4D° X 65878. 6

76. 6

134. 9

202. 2 IX 65450. 2 3s 3p4 3p X 72943. 3

4 2 S

2X2 3X65585. 1 65787. 3 3s2 3p2

(

3 P)3d 3d 2 D? ix

2/2 73248. 1 3s2 3p2

(

3 P)4p 4p 4P° X 66848. 4 16. 8

183. 9 ix 66860. 2 3s2 Sp2

( 3P)5s 5s 4 P X 75064. 6? 146 7

2/2 66544- 1 ix

2y

75211. 3?

75533. 4?

322. 1 3s2 3p2

(

3P)4p 4p 2D° ix

2X

ix

66818. 1 66870. 2? 57. 1

3s2 3p2 (

3P)4p 4p 4 S° 66884. 6 P n (

3 P0) Limit 88560

3s 3p4 3p4 2P ix 67908. 6 -217. 6 X 68126. 2

November 1947.
P i Observed Terms*

Config.

Is 2 2s2 2p«+ Observed Terms

3s2 3p3 f3p3 4 S°

\ 3p3

P° 3p3 2 D°

3s 3p4 / 3p4

P

\3

p

4 2 S 3p4 2 P 3p4 2 D

ns (n> 4) np (n> 4) nd (n> 3)

3s2 3p2

(

3 P)na; / 4, 5s 4 P

\ 4s 2 P

4p 4 S°

4p 2 S°

4p 4P° 4p 4 D°

4p 2 P° 4p 2 D°

3d 4P

3d 2 P

3d 4 D

3d 2 D? 3d 2 F

3s2 3p2

(

1 D)naJ/ 4s' 2 D

For predicted terms in the spectra of the P I isoelectronic sequence, see Introduction.

PII

(Si i sequence; 14 electrons) Z=15

Ground state Is2 2s2 2p

6 3s2 3p

2 3P0

Sp2 3 P0 158550.0 cm”1 I. P. 19.65 volts

The terms are mostly from the 1936 paper by Robinson, who has revised and extended

the earlier analysis by Bowen. The singlet and triplet terms are well connected by intersystem combinations.

In his later paper Robinson adds two quintet terms, and makes a few corrections to his

earlier list which have been incorporated here. The quintet terms are not connected by

observation with the rest, as indicated by the uncertainty x and brackets denoting that the

relative position of 3^3 6S° is estimated.

REFERENCES

I. S. Bowen, Phys. Rev. 29, 510 (1927). (T) (C L)

S. Tolansky, Zeit. Pkys. 74, 336 (1932). (hfs) H. A. Robinson, Phys. Rev. 49, 297 (1936). (I P) (T) (C L)

H. A. Robinson, Phys. Rev. 51, 726 (1937). (T)
165

Pn Pn

Config. Desig. J Level Interval Config. Desig. J Level Interval

3s2 3p2 3p2 3P 0

12

0. 0

166. 6

470. 3

166. 6

303. 7

3s2 3p(2 P°)4d 4d 3 D° 3

2

1

127888. 6

127890. 2

127985. 7 -556. 6 -45. 5

3s2 3p2 3p2 3 D 2 8882. 6 3s2 3p(2P°)4d 4d 3 P° 0 127368. 7

232. 5

349. 9

1 127601. 2

3s2 3

p

2 3p2 »S 0 21576. 4 2 127951. 1

3s 3p

3 3p3 fi S° 2 [52450. 0]+x 3s 2 3p(2 P°)4d 4d 1 D° 2 129612. 0

3s 3p* 3p3 3 D° 1 65251. 8

21. 1 34. 8

3s2 3p(2P°)5p 1 (5p 3 S?) 1 129625. 5?

2 65272. 9

3 65807. 7 2 2 130239. 6

3s 3p8 3p3 3 P° 2 76764- 9

48 3 3 1,2 130826. 2

1 76818. 2 -11. 2 0 76824. 4 3s2 3p(2 P°)5p 4 (5p !D?) 2 130913. 9

3s 3p3 3p3 1 D° 2 77710. 8 5 2 130949. 6

3s2 3p(2P°)4s 4s 3P° 0 86599. 0

146. 1 381. 0

3s2 3p(2 P°)5p 6 (5p 4 P?) 1 130970. 0

1 86745. 1 2 87126. 1 7 2 131320. 5

3s2 3p(2 P°)4s 4s »P° 1 88898. 5 8 1,2 131601. 9

3s 3p3 3p3 1 P° 1 102798. 4 9 2 131633. 1

3s2 3p(2 P°)4p 4p 3 D 1 103166. 7

173. 5

328. 7

10 ? 131652. 1? 2 103340. 2 3 103668. 9 3s2 3p(2P°)4d 4d iP° 1 181729. 1

3s2 3p(2 P°)3d 3d 3P° 2 103632. 8 -123. 1 -464

3s2 3p(2P°)4d 4d 1F° 3 181764- 4

1 108755. 4 0 104219? 3s2 3p(2 P°)4/ 11 (4f

iD?) 2 132082. 4

3s2 3p(2 P°)3d 3d *D° 1 103985. 8

117. 4

48. 2

12 2,3 132134. 1 2 104058. 2

3 104101. 4 13 2 132163. 6

3s2 3p(2 P°)4p 4p 3P 0 105225. 5

78. 1 247. 3

14 2 132206. 9

12

105303. 6 105550. 9 3s2 3p(2P°)4/ 15 (4/ iF?) 3 132236. 0

3s2 3p(2 P°)3d 3d 1 D° 2 105968. 1 16 2,3 132354. 7

3s2 3p(2 P°)4p 4p 3 S 1 106002. 5 17 1 132371. 2

3s2 3p(2 P°)4p 4p *D 2 107924. 2 18 2 132397. 0

3s2 3p(2 P°)3d 3d 1 P° 1 108371. 8 3s2 3p(2P°)5p 19 (5p *S?) 0,1 132641. 5?

3s2 3p(2 P°)4p 4p *P 1 108417. 4 20 1 133418. 8?

3s 3p3 3p3S° 1 110254. 9 3s2 3p(2P°)6s 6s 3P° 0 187433 53

514 1 137486

2° 2,3 110456. 97 2 138000

3s2 3p(2 P°)4p 4p X S 0 111114. 8 3s2 3p(2 P°)6s 6s »P° 1 188058. 4

3s2 ;3p( 2 P°)5s 5s 3 P° 0 123845. 4 111. 3

435. 3

3s2 3p(2 P°)5d 5d 3P° 0

1 128456. 7 1 2 128892. 0 2 139091. 9

3s2 3p(2 P°)5s 5s 1 P° 1 124483. 8 3s2 3p(2P°)6d 6d 3 P° 0

1 3s2 3p(2 P°)4d 4d 3 F° 2 124955. 9

174. 7

262. 1

2 145519. 8

3 125130. 6 4 125392. 7 P in (

2PA)

3s 3p2

(

4P)3d

Limit 158550. 0

3d 6P 3 160018. 2+x 126 5 2 160144. 7+x -90. 5

1 160235. 2+x

October 1947.
166

P ii Observed Terms*

Config.

Is2 2s2 2

p

6 +

Observed Terms

3s2 3p

2 {3p2 *S 3p

2 3 P

3p

2 3 D

3s 3p

3 f3p3 5S°

3p3 3 S° 3p3 3 P°

3p

3 1 P°

3p3 3 D°

3p3 1 D°

ns (n> 4) np (n> 4) nd (n > 3)

3s2 3p(2 P°)nx

{

4-6s 3 P°

4-6s ip°

4p

3 S

4p

3 S

4p

3 P

4p !P 4p

3 D

4p

3-6d 3 P°

3, 4d 1 P°

3, 4d 3 D° 4d 3 F°

3, 4d 1 D° 4d 'F0

3s 3p2

(

4 P)nx 3d ®P For predicted terms in the spectra of the Si i isoelectronic sequence, see Introduction.

P III

(A1 1 sequence; 13 electrons) Z= 15

Ground state Is2 2s2 2p

6 3s2 3p2P^

3p

2P^ 243290.0 cm"1 I. P. 30.156±0.003 volts

The terms have been taken from Robinson, who has revised and extended the earlier work

on analysis. An evident misprint has been corrected here, i. e., the absolute term values of

4/ 4D should have been printed as negative.

Robinson has classified two lines as the intersystem combination 3p 2P°—3p

24P. He

remarks that these must be considered as tentative classifications, but that they are consistent

with the analagous transition in A1 1 . REFERENCES

R. A. Millikan and I. S. Bowen, Phys. Rev. 25, 600 (1925). (T) (C L)

I. S. Bowen, Phys. Rev. 39, 13 (1932). (T) (C L)

H. A. Robinson, Phys. Rev. 51, 726 (1937). (I P) (T) (C L)
167

P m P m

Config. Desig. J Level Interval

3s2 (*S)3p 3p

2 P° K

IK

0. 0

559. 6

559. 6

3s 3p2 3

p

2 4 P K

IK

2K

56919. 3

57125. 8

57454. 5

206. 5

328. 7

3s 3

p

2 3p2 2 D !K

2K

74915. 1 74944. 6

29. 5

3s 3

p

2 3

p

3 2 S K 100201. 2

3s 3p2 3p2 2P K

IK

109035. 7

109409. 7

374. 0

3s2

(

J S)3d 3d 2D IK

2K

116873. 6

116884. 9

11. 3

3s2 (

1 S)4s 4s 2 S K 117834. 5

3s2 (

1 S)4p 4p 2P° K

IK

141375. 7 141512. 8

137. 1

3p

3 3

p

3 2 D° IK

2K

147322. 4

147384. 3

61. 9

3p

3 3

p

3 4 S° IK 159714, 6 3p3 3p3 2 P° IK

K

170107. 2

170167. 0 -59. 8

3s2 (‘S)4d 4d 2 D J IK

l 2^ } 172429. 2

3s 3p(3P°)3d 3d 4P° 2K

!K

K

173813. 4

173988. 4

174106. 2 -175. 0

-117. 8

3s 3p(3P°)3d 3d 4D° K

!K

2K

3%

175260. 8

175314- 1 175376. 6

175437. 2

53. 3

62. 5

50. 6

3s2 (

1 S)5s 5s 2S K 176041. 0

3s2

(

1 S)4/ 4/ 2F° f 2H

l 3K } 178653. 2

Config. Desig. J Level Interval

3s 3p(3P°)4s 4s 4P° K

!K

2K

184453. 4

184639. 3

185045. 2

185. 9

405. 9

3s 3p(3 P°)3d 2^0 IK 184854. 1 3s 3p(3 P°)4s 4s 2P° K

IK 186920. 7

3s2

(

x S)5p 5p2P° K

IK 191639. 5

3s2

(

1 S)5d 5d 2 D / IK

l 2K } 200442. 8

3s2 OS) 6s 6s 2 S K 201103. 4

3s2

(

1 S)5/ 5f

2 F° f 2K

l 3K } 202906. 4

3s2 OS)5<7 5g

2 G J 3H

t 4# } 203782. 7

3s 3p(3 P°)4p 4p

4 P K

!K

2K

209938. 9

210055. 8

210306. 1

116. 9

250. 3

3s 3p(3P°)4p 4p 4 S IK 211339. 4

3s2 OS) 6d 6d 2 D f IK

l 2^ } 213982. 8

3s2 OS) 6/ 6/ 2 F° f 2H

l 3K | 215402. 0

3s2 0S) 6<? 6^ 2 G f 3K

1 4^ } 215863. 2

3s2 0S)7<7 7g

2 G / 3K

1 4K | 223131. 0

P iv (‘So) 3s 3p(3P°)4/

Limit 243290. 0

4

4 D 3K

2^

!K

K

248168. 4

248199. 4

248228. 4

248265. 5

-31.0

-29. 0 -37. 1

September 1947.

P hi Observed Terms*

Config.

Is2 2s2 2

p

6 +

Observed Terms

3s2 (‘S)3p 3p 2 P°

3s 3p2 { 3p2

S 3p2 4 P

3p2 2 P 3p2 2 D

3p3 |

3p3 4 S° 3p3 2 P° 3p3 2 D°

ns ( n> 4) np (n> 4) nd (n> 3) nf 4) ng (n> 5)

3s2 (‘S)nx 4-6s 2 S 4-5p 2 P° 3-6d 2 D 4-6/ 2F° 5-7gr 2 G

3s 3p(3 P°)tt£

{

4s 4 P°

4s 2P°

4p 4 S 4p 4 P 3d 4 P° 3d 4 D° 4f

4 D°

*For predicted terms in the spectra of the A1 1 isoelectronic sequence, see Introduction.
(Mg i sequence; 12 electrons) Z= 16

Ground state Is2 2s2 2p& 3s2 JS0

3s2 % 414312.4 cm"1 I. P. 51.354 ±0.013 volts

The analysis published by Bowen in 1932 has been extended by Robinson to include a

total of 105 classified lines in the range from 283 A to 4291 A.

Intersystem combinations connecting the singlet and triplet terms have been observed.

Robinson remarks that the observed combination 3s21S0 —3p

3Pj obeys the irregular doublet

law very well.

REFERENCES

I. S. Bowen, Phys. Rev. 39, 10 (1932). (T) (C L)

H. A. Robinson, Phys. Rev. 51, 727 (1937). (I P) (T) (C L)

P IV PlV

Config. Desig. J Level Interval Config. Desig. J Level Interval

3s2 3s2 J S 0 0. 0 3s(2 S)4d 4d 3 D 2 296757. 8

3s(2S)3p Bp 3P° 0 67911. 6 227 4 3p(2P°)3d 3d ip° 1 298827

12 68189. 0

68607. 4

468. 4

3s(2S)4/ 4/ 3 F° 2 803115 235

309 3 808350

3s(2S)3p Bp ip° 1 105189. 9 4 803659

3s(2S)3d 3d 3 D 2 158138. 2 3s(2 S)5s 5s 3 S 1 309102. 4 3p2 Bp2 3P 0 164935 243

468

3p(2P°)4s 4s ip° 1 813078

1 165178

2 165646 3s(2 S)5s 5s »S 0 316627. 0

3p

2 Bp2 ! D 2 166144 3p(2P°)4s 4s 3P° 0 817662 286

405 1 8179^8

3s(2 S)3d 3d 3D 3, 2,1 189389. 0 2 818353

3p

2 3p2 3 S 0 194588. 5 3s (

2 S) 5p 5p3P° 0

1 320053 73

3s(2 S)4s 4s 3 S 1 226888. 6 2 820126

3s(2 S)4s 4s iS 0 233995. 0 3s(2 S)5p 5p ip° 1 820068. 5

3s(2 S)4p 4p

3 P° 0 256544- 1

58. 6

148. 6

3s(2S)5d 5d 3D 3 339635. 5 -3. 8 -2. 8

1 256602. 7 2 339639. 3

2 256751. 3 1 339642. 1

3s(2 S)4p 4p

ip° 1 257520. 2 3s(2 S)5d 5d 3 D 2 341004. 8? Bp (2P°)3d 3d 2 F° 3 276270? 3s(2S)5/ 5/ 3F° 2

3 848809 281

3p(2 P°)3d 3d 1 D° 2 276825? 4 843590

3p(2P°)3d 3d 3 P° 2 281011 -240

-140

Bs(2S)5g 5g 3 G 3, 4,5 343688

1 281251

0 281891 3s(2S)6s 6s 3 S 1 346672

3p(2P°)3d 3d 3D° 1 288142 97

82

3s(2S)6p 6p

3 P

0

1 852125? 2 283289

3 288321

3s(2 S)4d 4d 3D 1 293233. 5

5. 4

7. 7 P v (

2 Sh) Limit 414312.4

2 293238. 9

3 293246. 6

July 1947.
P rv Observed Terms*

169

Config.

Is2 2s2 2p

6 +

Observed Terms

3s

2 3s2 »S

3s(2 S)3p

{

o

£Pho A

A

COCO

3p2 { 3p2 iS 3p2 3 P

3p2 *D

ns (n> 4) np (n> 4) nd ( n> 3) nf (n> 4) ng (n> 5)

3s(2 S)nx /4-6s 3 S

\4,5s *S

4, 5p

3 P°

4-6p iP° 3-5

d

3 D

3—5d iD

4, 5/ 3F° 5g

3 G

3p(2P°)nx 4s 3 P°

4s iP° 3d 3 P°

3d *P° 3d 3 D°

3d >D° 3d 1 F°

* For predicted terms in the spectra of the Mgi isoelectronic sequence, see Introduction.

P v (Na i sequence; 11 electrons) Z—15

Ground state Is2 2s2 2p

6 3s

2 S^

3s 2SH 524462.9 cm"1 I. P. 65.007±0.003 volts

The analysis is from Robinson who has extended the earlier work by Bowen and Millikan.

The total number of classified lines is 38, of which 31 are in the range between 210 A and 1610 A.

The absolute value of 6h

2H° was extrapolated along the Na i isoelectronic sequence.

REFERENCE

H. A. Robinson, Phys. Rev. 51, 732 (1937). (I P) (T) (C L)

P y P v

Config. Desig. J Level Interval Config. Desig. J Level Interval

3s 3s 2 S X 0. 0 6s 6s 2 S X 427157

3V 3p 2 P° X 88651. 7

794. 6 6p 6p

2 P° X

ix 89J+J+6. 3 ix 435100. 4

3d 3d 2D ix

2X

204197. 1 204208. 3

11. 2 6d 6d 2 D s m

\ 2K }

445814

4s 4s 2 S X 272961. 1 6/ 6/ 2 F° / 2'/,

l 3X } 448061. 7 4p 4p

2 P° X 304161. 3

284. 0 ix 304445. 3

6g 6^ 2 G

1 3X

\ | 448216. 8 4d 4d 2D ix 345398. 4 4.9 2X 345403. 3 6h 6h

2 H° / 4^

l 5X |

448247.4

4/ 4/ 2 F° { 2K

l 3X | 352595. 3

7s 7s 2 S X 455573

5s 5s 2 S X 376639. 2 7V 7p

2P° { %

l 1/2 |

460363

5p 5p 2 P° X 391101. 7

140. 7 ix 391242. 4 7

d

7d 2D r ix

t 2H }

466893

5d 5d 2D f IX

l 2K } 410631. 1 7/ 7/ 2 F° I 2h

l 3X |

468530

5/ 5/ 2F° / 2K

l 3X | 414458. 7 8P 8p

2 P° i

X,

l ix }

476181

5g 5g

2 G I 3X

\ 4X | 414684. 4 P vi ('So) Limit 524462. 9 June 1947.
170

P VI

(Nei sequence; 10 electrons) Z=15

Ground state Is2 2s2 2p

6 'So

2p6 'So 1778250 cm"1 I. P. 220.414 volts

The analysis is by Robinson who has generously furnished his manuscript in advance of

publication. He has classified 23 lines in the range 57 A to 91 A, as combinations with the

ground term. The term designations he assigns on the assumption of Z/S-coupling are given

in the table under the heading “Author”.

As for Nei, the ^-coupling notation in the general form suggested by Racah is introduced.

A predicted value of 7d [1K]°> is entered in brackets in the table, since the observed combination is a blend.

REFERENCES

G. Racah, Phys. Rev. 61, 537 (L) (1942).

H. A. Robinson, unpublished material (June 1947). (I P) (T) (C L)

P VI P VI

Author Config. Desig. j Level Author Config. Desig. J Level

2p

iS0 2p

6 2P

6 iS 0 0 2p5

(

2 P£) 5s 5s' [ y2]° 0

5s 3Pi 1 1582860

2p5(3P!H)3s 3s [1%]° 2

3s 3Pi 1 109321+0 2P

5

( 2Pij^)5d 5d [ y2y 0

5d 3Pi 1 1613680

2P

«( 2PA)3s 3s' [ y2 ]° 0

3s ip

a 1 1103180 5d iPj n

5d [i yy 1 1616320

5d

3Di 2P5

( 2P£)5d 5d'[l^]° 1 1622800

3d »Pi 2p5

(

2 Pi^)3d 3d [ y2 ]° 0

1 1306610

2p5

( 2P£)6s 6s' [ y2]° 0

3d J Pi // 3d [i y2]° 1 1321910 6s !Px 1 1650930

3d 3 DX 2p6 (

2P£)3d 3d'[iy2 y 1 1331+210 6d iPx 2p5

(

2 Pf^) 6d 6d [1 y2]° 1 1666220

2p5 (*PiH)4s 4s [i y2]° 2 6d 3Di 2p5(

2 P£)6d 6d'[lH]° 1 167291+0 4s 3 Pi 1 11+3981+0 2ps (

2 P£)4s 4s'[ y2]° 0 7d iPi 2p5

(

2 P!^)7d 7d [l/2]° 1 [1696180]

4s JPi 1 11+1+671+0 7d 3DX 2p5 (

2 P£)7d 7d'[l/2]° 1 1702790

2P

5

(

2Pfo)4d 4d [ y2]° 0

4d 3PX 1 1516530 8d iPi 2p5

(

2 Pi^)8d 8d [1^]° 1 17151+1+0 4d iPi // id [i y2]° 1 15231+60 9d !PX 2p5

(

2PW9d 9d [134]° 1 1726160

4d 3 DX 2p5

(

2 P£)4d 4d'[lJ*]° 1 1531210

2p5

(

2Pfo)5s 5s [i y2 ]° 2

5s »Pi 1 157601+0 P VII ( 2Pfo) Limit 1778250

P VII (

2 P£) Limit 1785518

June 1947.
171

P vi Observed Levels*

Config.

Is 2 2s 2 +

Observed Terms

2p

6 2

p® X S

ns (n> 3) nd (n> 3)

2p5

(

2P°)wa; / 3-5s

3 P°

\ 3-6s X P°

3-5eZ 3 P° 3-7cZ 3 D°

3-9cZ X P°

jZ-Coupling Notation

Observed Pairs

ns (n> 3) nd (n> 3)

2p5

(

2 Plx)nx 3-5s [1 y2]° 3-5d [ y2]° 3-9d [i y2]° 2p5

(

2 P£)nz' 3-6s' [ y2]° 3-7d' [1 y2 ]°

*For predicted levels in the spectra of the Ne i isoelectronic sequence, see Introduction.

P VII

(F I sequence; 9 electrons) Z=15

Ground state Is

2 2s2 2p

5 2P°y

2

2pB2Plya 2124300 cm-1

I. P. 263.31 volts

The analysis is by Robinson, who has generously furnished his manuscript in advance of

publication. He has classified more than 70 lines in the region between 49 A and 223 A.

Intersystem combinations connecting the doublet and quartet terms have been observed.

REFERENCE

H. A. Robinson, unpublished material (March 1948). (I P) (T) (C L)
172

P vii p vn

Config. Desig. J Level Interval Config. Desig. J Level Interval

2s2 2p8 2p

6 2 pO IX

X

0

7268 -7268 2s2 2p4 (

3 P)4s 4s 2 P 1/

X

1695720

1701380 -5660

2s 2

p

8 2p« 2 S y2 454732

2s2 2p4 (

x D)4s 4s' 2 D 1 2K

\ iH |

1741710

2s2 2p4 (

3 P)3s 3s 4P 2H 1259730 -4440

-1830 1 X 1264170 2s2 2p4 (

3P)4d 4d 2 D 2/ 1775510 -8520 x 1266000? 1/ 1784030

2s2 2p4

(

3P)3s 3s 2P IX 1277380 -5170 2s2 2p 4 (

3 P)4d 4d 4 P /

X 1282550 1/

2/ }

1778690

2s2 2p4 (

x D)3s 3s' 2 D 2/ 1317110

1 X 2s2 2p4

(

3 P)4d 4d 2P H

1/

1780190

1782260 2070

2s2 2p 4 (

x S) 3s 3s" 2 S X 1375810

2s2 2p4 0S)4s 4s" 2 S 1801570

2s2 2p4 (

3 P)3d 3d 4 P 2X 1496890 -3150 ix

X

1500040 2s2 2p4 (

x D)4d 4d' 2 P 1/

Z

1827890

1829190 -1300

2s2 2p4 (

3 P)3d 3d 4F 4/2 3y2 2s2 2p4 (

4 D)4d 4d' 2 D J 2/

l 1 X }

1828630

2y2 1 X 1498400 2s 2 2p4

(

x D)4d 4d' 2 S y2 1830190

2s2 2p4 (

3P)3d 3d 2 D 2y2 1502040 -4690 2s2 2p4

( 3P) 5s 5s 2 P 1

1865680

1 X 1506730 /

2s2 2p4 (

3 P)3d 3d 2 P X

1/2 1505300

1511310 6010 2s2 2p4

(

x S)4d 4d" 2 D J 2^

l 1/ }

1885000

2s2 2p4 (3 P)3d 3d 2 JP 3 A

2y2 1510050

2s2 2p4

(

4 S)5s 5s" 2 S z 1913620

2s 2p6

( 3 P°)3d 3d'" 1° 19193107

2s2 2p4

(

x D)3d 3d' 2 P y2 1548480 3690 iy2 1552170 2s 2p6

(

3 P°)3d 3d'" 2° 1921010?

2s2 2p4

(

x D)3d 3d' 2p 3/

2/ 1552120

2s 2p5

( 3P°)3d 3d'" 3° 1922150? 2s 2p 6 (

3P°)3d 3d'" 4° 1925560? 2s2 2p4 (

x D)3d 3d' 2 D 2/ 1553740 -680

1/2 1554420 2s 2p8

( 3P°)3d 3d'" 5° 19310707

2s2 2p4

(

x D)3d 3d' 2 S X 1555560

2s2 2p4 (

x S)5d 5d" 2 D J 2/

l I/2 }

2013690

2s2 2p4 (

x S)3d 3d" 2D 2/

1/2

1/2X

1606550

1606880 -330

2s 2p8

(

3 P°)3s 3s'" 2 po 1692160 -4700 P vni (

3P2) Limit 2124300

1696860

P vii Observed Terms*

Config.

ls2 +

Observed Terms

2s2 2p5 2p5 2po

2s 2

p® 2p« 2S

ns (n>3) nd (n> 3)

2s2 2p*(3P)nx

{

3s 4P

3-5s 2 P

3, 4d 4P

3, 4d 2P 3, 4d 2D

3d 4 F

3d 2 F

2s2 2p4 (

x D)nx' 3, 4s' 3D 3, 4d' 2S 3, 4d' 2P 3, 4d' 2D 3d' 2F

2s2 2p4

(

x S)na;" 3-5s" 2S 3-5d" 2D

2s 2p8

(

3P

0)nz'" 3s'" 2P°

For predicted terms in the spectra of the F i isoelectronic sequence, see Introduction.
173

P VIII

(O i sequence; 8 electrons) Z=15

Ground state Is

2 2s2 2p4 3P2

2

p

4 3P2 2495000 cm”1 I. P. 309.26 volts

The terms are from an unpublished manuscript kindly furnished by Robinson. No intersystem combinations have been observed and the uncertainty, x, may be considerable.

The unit adopted by Robinson, 103 cm-1

, has here been changed to cm-1

. REFERENCE

H A. Robinson, unpublished material (March 1948). (I P) (T)

P vin P vm

Config. Desig. J Level Interval Config. Desig. J Level Interval

2s2 2p* 2p4 3 P 2 0 e;7^7 2s2 2p3 (

2P°)3d 3d" 3F° 4

105757

7826 -2069 32 1790480

1795080 -4550

2s2 2p* 2p4 *D 2 52450 +x 2s2 2p3

(

2 P°)3d 3d" >D° 2 1795430+x

2s2 2p* 2

p

4 *S 0 1 10970 +x 2s 2 2p3

(

2 P°)3d 3d" 3 D° 3 1796240 -4530 2 1800770

2s 2p

& 2p5 3P° 2 408806 5107 1

1 408913 -2823

0 411786 2s2 2p3

(

2 P°)3d 3d" »P° 1 1800760 +x

2s 2

p

6 2p& ip° 1 560680+x 2s2 2p3

(

2 P°)3d 3d" iF° 3 1804980+x

2s2 2p3

(

4 S°)3s 3s 3 S° 1 1462340 2s2 2p3 (

4 S°)4s 4s 3 S° 1 1958370

2s2 2p3 (

2D°)3s 3s' 3D° 1,2 1519740 290 2s2 2p3 (

2 D°)4s 4s' 3 D° 1 3 1520030 2

3 2029470

2s2 2p3

(

2D°)3s 3s' ‘D° 2 1582020+x

2s2 2p3

(

2 D°)4s 4s' ‘D° 2 2033820 +x

2s2 2p3

( 2P°)3s 3s" 3 P° 0 1559500 570

1190 1 1560070 2s2 2p3 (

4 S°)4d 4d 3 D° 1 2 1561260 2

3 2046710

2s2 2p3 (

2P°)3s 3s" 3 P° 1 1678270+x

2s2 2p3 (

2 P°)4s 4s" 3 P° 1 2073760+x

2s2 2p3 (

4 S°)3d 3d 3D° 1,2 1685980 300 3 1686280 2s2 2p 3 (

2 D°)4d 4d' 3 D° 3, 2,1 2115510

2s2 2p3

(

2 D°)3d 3d' 3F° 4, 3,2 1749870 2s2 2p3 (

2D°)4d 4d' 3 P° 2

i 2119360

2s2 2p3

(

2 D°)3d 3d' 3 D° 3, 2,1 1753090 0

2s 2 2p3

(

2 D°)3d 3d' !P° 1 1758880 +x 2s2 2p3

( 2 D°)4d 4d' 3 S° 1 2122020

2s2 2p3

(

2D°)3d 3d' »P° 2 1760580 -1870 2s2 2p3 (

2 D°)4d 4d' !F° 3 2128570+x

1 1762400

0 2s2 2p3 (

4 S°)5d 5d 3D° 1o

2s2 2p3

( 2D°)3d 3d' 1D° 2 1761680+x 3 2210680

2s2 2p3

(

2 D°)3d 3d' 3 S° 1 1767880 2

2 2p3 (

2D°)5s 5s' !D° 1 2240920+x

2s2 2p3

(

2 D°)3d

2s2 2p3

(2P°)3d

3d' 3 F

0 3 1776050+x

3d" 1787090 3P° 0 1000

1600

p IX (<s!h) Limit 2495000

1 1788090

2 1789690

March 1948.
174

P viii Observed Terms*

Config.

1 s

2 +

Observed Terms

2s2 2p

4 { 2p

4 iS 2p

4 3 P

2p

4 4D

2s 2p

s {

2p5 spo

2p

5 ip°

ns (n> 3) nd (n> 3)

2s2 2p3

(

4 S°)nx 3,4s 3 S° 3-5d 3 D°

2s2 2p3

( 2D°)nx'

{

3,4s' 3 D°

3-5s' 1D°

3, 4d' 3 S° 3, 4d' 3 P°

3d' 1 P°

3, 4d' 3 D°

3d' 'D°

3d' 3 F°

3, 4d' XF°

2s2 2p3

( 2 P°)nx"

{

3s" 3 P°

3, 4s" 4P°

3d" 3 P°

3d" ip°

3d" 3 D°

3d" >D°

3d" 3 F°

3d" 4 F°

*For predicted terms in the spectra of the O i isoelectronie sequence, see Introduction.

PlX

(N i sequence; 7 electrons) Z— 15

Ground state Is2 2s2 2p3 4S°^

2f

4S^ 3006200 cm"1 I. P. 372.62 volts

The analysis is by Robinson, who has kindly furnished a manuscript copy in advance of

publication. He has found 35 terms, and classified more than 100 lines in the region between

40 A and 314 A. Intersystem combinations connecting the doublet and quartet systems of

terms have been observed.

REFERENCE

H. A. Robinson, unpublished material (March 1948). (I P) (T) (C L)

P IX P IX

Config. Desig. J Level Internal Config. Desig. J Level Interval

2s2 2p

3 2p

3 4g° 1/2 0 2p5 2p3 2po IX 898220 -6480 z 904700

2s2 2p3 2p

3 2D° i Z

2/

73167

73780 563

2s2 2p2

(

3P) 3s 3s 4 P z 1744000 2250

1Z 5600 1746250

2s2 2

p* 2p3 2p° X 113457 973 2Z 1751850

1 X 114480

2s2 2p2

( 3P)3s 3s 2P z 1764370 4600

2s 2p4 2p

4 4P 2/2 345390 -5050

-2610

iz 1768970

1/2X

350440

353050 2s2 2p2 (

1 D)3s 3s' 2D iz

2Z

1805940

1807340 1400

2s 2p4 2p

4 2 D 2/ 472580 -510

1 X 473090 2s2 2p2

( 3P)3d 3d 2P izz

1962630

1963830 -1200

2s 2p4 2p

4 2S z 552540

2s 2p3

(

5S°)3s 3s'" 4gO iz 1965970

2s 2p4 2p

4 2P ix

%

580710

587010 -6300 3d 2JT 2Z 1970380 6230 2s2 2p2

( 3P)3d

3Z 1976610
175

P IX—Continued P ix—Continued

Config. Desig. J Level Interval Config. Desig. J Level Interval

2s2 2p2 (

3P)3d 3d

4D X 2s 2p3 (

3 D°)3p 3pIV 2F 2X

i % 1973870 2100 3X 2224980

2/4 1975970

3X 2s 2p3

(

3 D°)3d 3dIV 2 F° 3X

2X

2809530

2312530 -3000

2s2 2p2

(

3P)3

d

3d 4P 2x 1977830 -1920

-1120 IX 1979750 2s2 2p2

(

3P)4s 4s 4p X

X 1980870 IX

2X 2354100

2s2 2p2

(

3P)3d 3d 2 D 1 X 2000360 1600

2/2 2001960 2s2 2p2 (

3 P)4s 4s 2P X

IX

2354120

2359520 5400

2s2 2p2

(

4 D)3d 3d' 2 F 2y2 3X 2028530 2s2 2p2

(

3 P)4d 4d 2 F 2X

3/2 2430900

2436400 5500

2s2 2p2 0D)3d 3d' 2 D IX

2y2 2031610 f X ] 2s2 2p2 (

3 P) 4d 4d 4? < to \ 2435220

2s2 2p2

(

J D) 3d 3d' 2P X

ix

2038670

2042470 3800 l 2/2

J ix

l 2K

J

f >"2

] 2s2 2p2 (

3 P)4d 4d 2 D

}

2441100

2s 2p3 (

6S°)3p 3p'" 4p 1 to [ 2043950

l 2>4 J 2s2 2p2 (

1 D)4d 4d' 2JT 2X2 3X2 2480120

2s2 2p2

(

4 D)3d 3d' 2 S X

/ IX

l 2K

2049150

2s2 2p2 0D)4d 4d' 2 D { ) 2487270 ix

\ 2X2 2s2 2p2 0S)3d 3d" 2 D

|

2079720

4d" 2D

J

} 2547080

f IX

l 2)4

2s2 2p2

(

4 S)4d f ix

l 2/2 2s 2p3 (

3D°)3s 3sIV 2D°

|

2108110 J

f X ) 2s 2p3

( 5S°)3d 3d'" 4D° < to 2161390 P x (

3P0) Limit 3006200

1 3X

March 1948. P ix Observed Terms*

Config.

ls 2 +

Observed Terms

2s

2 2p3

2s 2p4

2p

5

f2p 3 4 S°

\ 2p3 2 P° 2

p

3 2 D°

f 2p4 4P

\2p4 2S 2p4 2P 2p4 2D

2p5 2pO

ns (n> 3) np (n> 3) nd (n> 3)

/ 3,4s 4 P 3, 4d 4 P 3d 4 D 2s2 2p2

(

3 P)nx

l 3, 4s 2 P 3d 2 P 3, 4d 2 D 3, 4d 2 F

2s2 2p2

(

1 D)nx' 3s' 2 D 3d' 2S 3d' 2P 3, 4d' 2 D 3, 4d' 2 F

2s2 2p2 (

1 S)nx" 3, 4d" 2 D

2s 2p3

(

5S°)nx'" 3s'" 4 S° 3p'" 4P 3d'" 4 D°

2s 2p3

(

3 D°)nxIV 3sIV 2 D° 3p!V 2p 3dIV 2 F°

*For predicted terms in the spectra of the N i isoelectronic sequence, see Introduction.
(C i sequence; 6 electrons) Z=15

Ground state Is

2 2s2 2p

2 3P0

2p2 3P0 3432500 cm'1 I. P. 425.46 volts

The analysis is from unpublished material kindly furnished by Robinson. He has found

36 terms and classified more than 70 lines in the region between 43 A and 318 A.

The singlet and triplet terms are connected by intersystem combinations. The connection

of the quintet terms with the rest is based on Robinson’s extrapolation of isoelectronic sequence

data, as indicated by the uncertainty, x, and brackets in the table. The position of the level

2p

3 3 D2 is also extrapolated and entered in brackets.

REFERENCE

H. A. Robinson, unpublished material (March 1948). (I P) (T) (C L)

Px P X

Config. Desig. J Level Interval Config. Desig. J Level Interval

2s2 2

p

2 2

p

2 3P 0

1 0 3390 3390

5190

2s 2 2p(2 P°)3d 3d 3P° 2

1 2171680

2178040 -1410

-950

2 8580 0 2178990

2s 2 2p2 2p

2 *D 2 59330 2s 2p2 (

4 P)3s 3s 3P 0 2178420 3900

5900

2s2 2p2 2p

2 iS 0 119430

12 2182320

2188220

2s 2p3 2p

3 5 S° 2 [1 66580] +x 2s2 2p(2P°)3d 3d ip° 1 2197500

2s 2

p

3 2p3 3D° 32 322790

[82SO10] [-220]

-150

2s2 2p(2 P°)3d 3d J F° 3 2197500

1 328160 2s 2p2 (

4 P)3p 3p 3 S° 1 2216880

2s 2

p

3 2p

3 3 P° 2 879660 2s 2p2

(

4P)3p 3p 3 D° 3 2262660 -4620

-2230 1 2 2267280

0 1 2269510

2s 2

p

3 2

p

3 'D° 2 484877 2s 2p2 (

4 P)3p 3p 3 P° 2 2275380 -5760

-4940 1 2281 140

2s 2p3 2p

3 3 S° 1 490100 0 2286080?

2s 2

p

3 2p3 1 P° 1 541090 2s 2p2

(

2 D)3s 3

s' 3 D 1, 2,3 2281000

2

2 2p(2P°)3s 3s 3P° 0 1954140 1840

7450

2s 2p2 PD)3s 3s' 3 D 2 2307970

12 1955980

1963480 2s 2p2

(

4 P) 3d 3d 6D 0

1 2s2 2p(2 P°)3s 3s 'P° 1 1976578

1}

2331040+x

2s 2p2

(

4P) 3s 3s 5P 1 2132450 +x 2600

4270

4

2 2135050 +x

3 2139320 +x 2s 2p2

(4P)3d 3d «P 3 2342240+x -1520

-1210

2

2 2p(2P°)3d 3d 3F° 2

o 2140410

2

1 2343760+x2344970 +x

4 2s 2p2 (

4 P)3d 3d 3P 2 2345800 -5940

-2900

2s2 2p(2P°)3d 3d 1 D° 2 2147190

10

2351740

2354640

2s2 2p(2P°)3d 3d 3D° 1 2162410 1090

3300

2s 2p2

(

4 P)3d 3d 3 F 2 2355750 2650

2 2168500 3 2358400 4500

3 2166800 4 2362900
177

P x—Continued P X—Continued

Config. Desig. J Level Interval Config. Desig. J Level Interval

2s 2p2

(

2D)3p 3p' X F° 3 2371790 2s 2p2

(

2 D)3d 3d' X D 2 2499250?

2s 2p2

(

2D)3p 3p' >D° 2 2382480 2s 2p2 (

2 D)3d 3d' X F 3 2499250?

2s 2p2

(

4P)3d 3d 3 D 12 2385080

2387080 2000

1550

2s 2p2

(

2 D)3d 3d' 3 S 1 2509590?

3 2388630

2s 2p2

(

2 D)3d

2s 2p2

(

2 D)3d

3d' 3 F 2, 3,4

1, 2,3

2467290 P xi (

2 PA) Limit 3432500

3d' 3 D 2476100

March 1948. Px Observed Terms*

Config.

ls 2 +

Observed Terms

2s2 2

p

2 {2p2 X S

2

p

2 3 P

2

p

2 X D

2s 2p*

f2p 3 2p3

5 g

°

3 S° 2p3 3po

2

p

3 X P°

2p3 3 D°

2

p

3 X D°

ns (n> 3) np (n> 3) nd (n> 3)

2s2 2p(2 P°)nx

{

3s 3 P°

3s X P° CO

CO 0

0 3d 3 D°

3d 1 D°

3d 3 F°

3d X F°

2s 2p2 (

4 P)nz

{

3s B P

3s 3P 3p 3 S° 3p 3 P° 3p 3 D°

CO

CO 3d 5 D

3d 3 D 3d 3 F

2s 2p2

(

2 D)na;'

{

3s' 3 D

3s' X D 3p' X D° 3p' X F°

3d' 3 S 3d' 3 D

3d' X D

3d' 3 F

3d' J F

For predicted terms in the spectra of the C i isoelectronic sequence, see Introduction.

P XI

(B i sequence; 5 electrons) Z— 15

Ground state Is2 2s2 2p 2P^

2p 2Pj 3867500 cm-1

I. P. 479.4 volts

The analysis is by Robinson, who has generously furnished his manuscript in advance of

publication. He has classified 31 lines in the range from 42 A to 325 A. Some of the relative

levels have been connected by a study of the behavior of the Rydberg denominators, rather

than by the Ritz combination principle.

No intersystem combinations, connecting the doublet and quartet terms, have been

observed, as indicated by £ in the table. Robinson’s extrapolated value of 2_p

2 4PH is entered

in brackets.

REFERENCE

H. A. Robinson, unpublished material (Feb. 1948). (I P) (T) (C L)
178

P xi P XI

Config. Desig. J Level Interval Config. Desig. J Level Interval

2s2 CS)2p 2p

2p° X 0

9700 2s 2p(3 P°)3d 3d 2 D° IX 2539140 910 IK 9700 2/2 2540050

2s 2p2 2p

2 4 P Yz 1/2 [177900] +*

181300 +x 3400

5100

2s 2p(1 P°)3s 3s' 2 P° / y2 i 1/2 | 2541040

2/2 186400 +x

2s 2p(3 P°)3d 3d *P° X

2s 2

p

2 2p

2 2 D J 1/2 \ 2/2 }

317190 1/2 2/2 2547290 +x

2s 2p2 2p2 2 S X 403330 2s 2p(3 P°)3d CO 0 2/2 2578000 6000 3/2 2584000

2s 2p2 2p2 2 P Y 425820 5830

1/2 431650 2s 2p(s P°)3d 3d 2 P° IX

X

2589460

2593090 -3630

2p

3 2p3 4 g

° 1/2 659500 +x

2s2 OS) 3s 3s 2 S X 2174060 2s 2p(1 P°)3d CO E=h 0 J 2Yi \ 3/2 }

2697820

2s2 OS) 3d 3d 2 D 1/2 2347470 660 2s 2p(1 P°)3d 3d' 2 D° 1/2 2707510

1890

2^2 2348130 2H 2709400

2s 2p(3 P°)3s 3s <p° 2/2 2869930 +x -6200

-3600

2p2

(

3 P)3d 3d" <P 2/2 2856820 +x -2150 2376180 +x 1H 2858970 +x

2s 2p(3 P°)3s 3s 2po

X

{ Y

l 1/2

2879730 +x

}

2410070

P xii OS0) Limit 3867500

2s 2p(3 P°)3d 3d 4 D° X

1/2 2/2 2586000 +x 4500

3M 2540500 +x

February 1948.

Pxi Observed Terms*

Config.

ls2 +

Observed Terms

2s2

(

1 S)2p

2s 2p2

2p

3

2p

2 P°

/ 2p2 <P \2p2 2 S 2p2 2P 2p2 2 D

2p3 4 S°

ns (n> 3) nd (n> 3)

2s2

(

1 S)nx 3s 2S 3d 2D

/ 3s <P° 3d *P° 3d <D°

2s 2p(3 P )nx

\ 3s 2P° 3d 2 P° 3d 2D° 3d 2 F°

2s 2p(1 P°)nx' 3s' 2P° 3d' 2 D° 3d' 2F°

2p2 (

3 P)nx" 3d" *P

For predicted terms in the spectra of the Bi isoelectronic sequence, see Introduction.
179

P xu

(Be i sequence; 4 electrons) Z= 15

Ground state Is2 2s2 'So

2s2 'So 4520500 cm"1 I. P. 560.3 volts

The analysis is by Robinson, who has kindly furnished his manuscript on this spectrum

in advance of publication. He has found 18 terms and classified 15 lines between 36 A and

44 A. Some of the relative terms have been connected by a study of the Rydberg denominators rather than by the Ritz combination principle.

No intersystem combinations have been observed, as indicated by the uncertainty x in

the table. Robinson’s extrapolated value of 2p

3 Pq is entered in brackets.

REFERENCE

H. A. Robinson, unpublished material (Feb. 1948). (I P) (T) (C L)

P XII P XII

Config. Desig. J Level Interval Config. Desig. J Level Interval

2s2 2s2 0 0 2s(2 S)3d 3d !D 2 2760490

2s(2 S)2p 2p

3 P° 0 [183190] +x 3200 2p(2 P°)3s 3s 3P° 1 2876720

1 186390 +x

2 192990 +x OOUU

2p(2 P°)3p Bp l P 1 2888690?

2s(2 S)2p 2p

ip° 1 3588^0 2p (

2 P°)3p Bp 3 D 1o 2p

2 2p23P 0

1 3 2897300 +x

2 490990 +x 2p(2 P°)3d 3d 1 D° 2 2936160

2p

2 2p21D 2 538190 2p(2 P°)3p Bp *D 2 2947770

2s(2 S)3s 3s 3 S 1 2594640 +x 2p(2 P°)3d 3d 3 D° 1, 2,3 2964340 +x

2s(2 S)3s 3s *S 0 2629250 2p(2P°)3d 3d !F° 3 3000210

2s(2 S)3p Bp iP0 1 2677740 2p(2 P°)3d 3d 1P° 1 3011540

2s(2 S)3d 3d 3 D 1 2726690 +x 500 2 2727190 +x

3 2727840 +x P xiii (

2 S*) Limit 4520500

February 1948.
180

P xii Observed Terms*

Config.

1 s

2 +

Observed Terms

2s2 2s2 iS

2s(2 S) 2p { 2p

3 P°

2p ‘P°

2p2 {

2p2 3 P

2p2 ‘D

ns (n> 3) np (n> 3) nd (n> 3)

2s(2 S)nx /3s

(3s

3 S

3p ‘P° 3d 3 D

3d !D

2p{2 V°)nx

{ 3s ‘P° 3p 3 D

3p ‘P 3p ‘D 3d ‘P° 3d 3 D°3d 1 D° 3d ‘F0

For predicted terms in the spectra of the Be i isoelectronic sequence, see Introduction.

P XIII

(Li i sequence; 3 electrons) Z— 15

Ground state Is2 2s 2S^

2s 2Sh 4933060 cm"1 I. P. 611.45 volts

This spectrum is incompletely analyzed. Robinson has kindly furnished his unpublished

manuscript giving seven classified lines; one at 110 A and six between 35 A and 38 A. The

resonance lines have not been observed. The absolute value of the ground term has been

extrapolated from isoelectronic sequence data. Similarly, other relative levels have been

connected by a study of the Rydberg denominators in the isoelectronic sequence rather than

by the Ritz combination principle.

REFERENCE

H. A. Robinson, unpublished material (Feb. 1948). (I P) (T) (C L)

P XIH

Config. Desig. J Level Interval

2s 2s 2S H 0

2P 2p

2 P° Vi

1 X

207720

219250 11530

3a 3s 2 S y2 2794900

3p 3p 2 P° H 2844890 5760

1 X 2850150

3d 3d 2 D 1 % 2870260 1360

2/2 2871620

V 4/ 2 F° 2%

3H 8772770?

P xiv (‘So) Limit 4933060

February 1948.
181

SULFUR

Si

16 electrons Z=16

Ground state Is2 2s2 2

p

6 3s2 3_p4 3P2

3p4 3P2 83559.3 cm"1 I. P. 10.357 volts

Edlen has revised and extended the earlier analyses and has generously furnished his

manuscript term list in advance of publication, for inclusion here. Brackets denote values

calculated from the series. For two such terms, however, 4/ and 8/ 5F, combinations with

3d

8D° have been observed.

Intersystem combinations connecting terms of all three multiplicities, have been observed.

REFERENCES

R. Frerichs, Zeit. Phys. 80, 150 (1933). (I P) (T) (C L) K. W. Meissner, O. Bartelt und L. Eckstein, Zeit. Phys. 86, 54 (1933). (I P) (T) (C L)

J. E. Ruedy, Phys. Rev. 44, 757 (1933). (I P) (T) (C L)

B. Edlen, Phys. Rev. 62, 434 (1942). (T)

W. F. Meggers, J. Opt. Soc. Am. 36, 431 (1946). (Summary hfs) B. Edl6n, unpublished material (Nov. 1946). (I P) (T)

Si Si

Config. Desig. J Level Interval Config. Desig. J Level Interval

3s2 3p* 3p4 3P 2

10

0. 0

396. 8

573. 6

-396. 8 -176. 8

3s2 3p3

(

2 D°)4s

3s2 3p3 (

4 S°)3d

4s' 3D°

3d 3 D°

2

1

69238. 7

70165. 9

0. 9

3. 9 2 70166. 8

3s2 3

p

4 3p4 *D 2 9239. 0 3 70170. 7

3s2 3

p

4 3

p

4 3 S 0 22181. 4 3s2 3p3 (

4 S°)5s 5s ®S° 2 [70706]

3s2 3p3

(

4 S°)4s 4s 5 S° 2 52623. 88 3s 2 3p3

(

4 S°)5s 5s 3 S° 1 71352. 5

3s2 3p3 (

4 S°)4s 4s 3 S° 1 55331. 15 3s 3p 5 3p

5 3p° 2 72025. 5 -357. 0 - 189. 9 3s2 3p3 (

4 S°)4p 4p

5P 1 63446. 36

10. 97

17. 93

1072382. 5

72572. 4

2 63457. 33

3 63475. 26 3s2 3p3 (

4S°)5p 5p

5P 1 73911. 53

3. 63

5. 98 2 73915. 16

3s2 3p3

(

4 S°)4p 4p

3P 0 64891. 71 -2. 48

3. 66

3 73921. 14

1 64889. 23

2 64892. 89 3s2 3p3 (

4 S°)5p bp 3P 2 74269. 20

1 08

3s2 3p3

(

2 D°)4s 4s' 3D° 1 67816. 87

8. 85

17. 66

10

74270. 28

74272. 32 -2. 04

2 67825. 72

3 67843. 38 3s2 3p3 (

4 S°)4d 4d 5D° 4 74973. 35 0 95

3 74974. so

1 13 3p3 (

4 S°)3d 3d 6D° 4 67878. 03 -12. 42

2. 20

2. 28

1. 30

2 74975. 43 —0 88

3 67890. 45 1 74976. 31 -6. 59

2 67888. 25 0 74976. 90

1 67885. 97

0 67884. 67
182

S I—Continued S I—Continued

Config. Desig. J Level Interval Config. Desig. J Level Interval

3s3 3p3

(

4 S°)4<2 4d 3 D° 1 75952. 16

0. 51

4. 13

3s2 3p3

(

4 S°)7p 7p

3P 2 80113. 23 -7. 28

-3. 65

2 75952. 67 1 80120. 51 3 75956. 80 0 80124. 16

3s2 3p3

(

4 S°)6s 6s 5S° 2 76464. 26 3s2 3p3

(

4 S°)6d 6d 3 D° 3 80182. 54 -1. 39

-1. 85

2 80188. 93

3s2 3p3

(

4 S°)4/ 4/ ®F 5 to 1 [76653] 1 80185. 78

3s2 3p3

(

4 S°)4/ 4/ *F 4, 3,2 [76655] 2s2 3p3

(

4 S°)8s 8s 5S° 2 80449. SO

3s2 3p3

(

4 S°)6s 6s 3 S° 1 76720. 90 3s2 3p3

(

4 S°)6/ 6/ 5F 5 to 1 80494. 73

3s3 3p3

(

2 P°)4s 4s" 3P° 0 77186. 10

14. 49

30. 82

3s 2 3p3

(

4 S°)6/ 6/ 3 F 4, 3,2 80495. 76

1 77150. 59

2 77181. 41 3s 2 3p3

(

4 S°)8s 8s 3 S° 1 80521. 99

3s2 3p3

(

4 S°)6p 6p ®P 1 77851. 21 3s2 3p3

(

4 S°)7d 7d 5 D° 4 80995. 48

2 5. 28 3

3 77856. 49 2

3s2 3p3

(

4 S°)6p 6p 3P 2

i 77891. 10

10

0 3s2 3p3

(

4 S°)8p 8p

3P 0,1 80995. 90

0. 43 2 80996. 33

3s2 3p3

(

2D°)4p 4p' 3D 1 78152. 45 -0. 45

51. 38 2 78152. 00 3s2 3p3

(

4 S°)7<2 7d 3D° 3 81080. 52 -2. 31 -2. 00

3 78203. 38 2 81082. 88

1 81084. 83

3s2 3p3

(

4 S°)5<2 5d ®D° 43,2

2, 1,0

78270. 80

78270. 72

78271. 19

-0. 42

-0. 47 3s2 3p3

(

4 S°)9s 9s ®S° 2 81281. 76

3s2 3p3

(

4 S°)7/ 7/ 5F 5 to 1 81309. 23

3s2 3p3

(

2P°)4s 4s" 1P° 1 78290. 4

3s 4, 3,2 81310. 08 2 3p3

(

4 S°)7/ 7/

3 F

3s2 3p3

(

2D°)4p 4p' 3 F 2 78410. 37

25. 93

27. 25 3 78436. 30 3s2 3p3

(

4 S°)9s 9s 3 S° 1 [81327. 8] 4 78463. 55

3s2 3p3

(

4S°)8d 8d

6D° 4 81628. 90

3s2 3p3

(

2 D°)4p 4p' 4 F 3 78638. 2 3

o

3s2 3p3

(

4 S°)5d bd 3D° 3 78692. 24

0. 46

-1. 21

1 2

1 78691. 7878692. 99

0

3s2 3p3

(

4 S°)8d 8d 3D° 3 81668. 4 O

3s2 3p3 (

4 S°)7s 7s SS° 2 79058. 24 2 81666 o

o

1 81668

3s2 3p3

(

4 S°)5/ 5/ 6F 5 to 1 79143. 18

3s2 3p3

(

4 S°)10s 10s 5S° 2 81819. 40

3s2 3p3

( 4 S°)5/ 5/ 3 F 4, 3,2 79144. 45

8/ 3s 5F 5 to 1 [81837. 3] 2 3p3

(

4S°)8/

3s2 3p3

(

4 S°)7s 7s 3 S° 1 79185. 74

8/ 3s 3 F 4,3,2 [81837. 9] 2 3p3

(

4S°)8/

3s2 3p3

(

2 D°)4p 4p' 3 P 2 79376. 34 -29. 40 - 12. 71

1 79405. 74 3s2 3p3

(

4 S°)9cJ 9d5D° 4 82058. 94

0 79418. 45 3

O

3s2 3p3

(

4 S°)7p 7p6P 1 1 2 0

3 79785. 72

3s2 3p3 (

4 S°)10d lOd 5D° 4 82353. 8

3s2 3p3 (

4 S°)6d 6d 6D° 4

o 79992. 86 3

9 2 1 10

0

Sii(4S!*) Limit 83559.

December 1947.
183

Si Observed Terms*

Config.

Is2 2s2 2p6 +

Observed Terms

3s2 3p4 { 3p4 *S 3

p

4 3 P

3p4

3s 3

p

5 3p5 3 P°

ns (n> 4) np (n> 4) nd (n> 3) nf (n> 4)

3s2 3p3

(

4 S°)nx J4, 6-10s 5 S°

t 4- 8s 3 S° 4—7p 5P

4-8p 3 P

3-10d 5 D°

3- 8d

3 D°

4-

8/ 5 F

5-

7/ 3 F

3s2 3p3

(

2 T>°)nx'

{

4s' 3 D°

4s' 4 D°

4p' 3 P 4p

1 3 D 4p' 3 F

4p' 4 F

3s2 3p3

(

2 P°)nx"

{

4s" 3 P°

4s" kP°

*For predicted terms in the spectra of the Si isoelectronic sequence, see Introduction.

S II

(P i sequence; 15 electrons) Z=16

Ground state Is2 2s2 2p6 3s2 3p

3 4S°^

3f %V2 188824.5 cm"1 I. P. 23.4 +0.1 volts

The terms are from the paper by Hunter. He has revised and extended the earlier analyses

of this spectrum.

The level labeled “x” in his list is here designated “1”. The configuration assignments

for this level and for the term called “(2P)” in the table are unknown. The latter is attributed

by Robinson to 3s2 3p2

(

3P) 3d instead of the term at 118146.50 cm-1

. Intersystem combinations, connecting the doublet and quartet systems of terms, have

been established by L. and E. Bloch and confirmed by Hunter. They indicate a correction

of +317.17 cm-1 to the absolute values of the doublet terms pubhshed by Ingram.

REFERENCES

S. B. Ingram, Phys. Rev. 33, 172 (1928). (I P) (T) (C L)

L. et E. Bloch, Ann. de Phys. [10] 12, 5 (1929). (T) (C L)

M. Gilles, Ann. de Phys. [10] 15, 301 (1931). (I P) (T) (C L) (Z E)

O. Bartelt und L. Eckstein, Zeit. Phys. 86, 77 (1933). (T) (C L) A. Himter, Phil. Trans. Roy. Soc. London [A] 233, 303 (1934). (I P) (T) (C L)

H. A. Robinson, Phys. Rev. 49, 297 (1936).
184

Sn S II

Config. Desig. J Level Interval Config. Desig. J Level Interval

3s2 3p3 3p3 4 S° 1/2 a 0 3s2 3p2 ( 3P)4p 4p 2P° z

1/2 133268. 53

133399. 82 131. 29

3s2 3p3 3p3 2 D° 1/2 14851. 9

31. 5 2Z 14883. 4 1 z? 133359. 4 3

2 3ps 3p3 2 po Z 24524. 2 40 fi 2 ( 2P) z 139845. 6

170. 1 1/2 24572. 8 3 1/2 140015. 7

3s 3p* 3p4 4 P 2/ 79394. 8 363 1 3s2 3p2 ( xD)4p 4p' 2 F° 2Z 140229. 78

89. 02 1 Z/2 79757. 9 79968. 0

-210. 1 3/2 140318. 80

3s2 3p2 ( x D)4p 4p' 2 D° 2Z 140708. 51 —41. 49 3s 3p4 3p4 2 P 1/2X

105599. 02

106044. 16 -445. 14 1/2 140750. 00

3s2 3p2 ( x D)4p 4p' 2P° z 148488. 61

134. 42 3s2 3p2 (3 P)4s 4s 4 P X 109560. 50

270. 78

437. 05

1/2 148623. 03

1/2 109831. 28

2/2 110268. 33 3s2 3p2 ( 3P) 5s 5s 4P z 150258. 20

272. 92

465. 15 IZ 150531. 12

3s2 3p2 (3 P)3d 3d 4 F 1/2 110176. 83

136. 30

195. 35

257. 83

2/ 150996. 27

2/2 110313. 13 3/ 110508. 48 3s2 3p2 ( 3 P) 5s 5s 2P z 151383. 83

526. 84 4/ 110766. 31 1/2 151910. 67

3s2 3p2 (3 P)4s 4s 2 P X 112937. 33

523. 89 3s2 3p2 ( 3 P)4<2 4d 4F iz 151959. 41

134. 93

210. 37

310. 54

1/2 113461. 22 2Z 152094. 34

3Z 152304. 71

3s2 3p2 (?P)ba 3d 4D z 114162. 20

38. 25

30. 30

48. 36

4Z 152615. 25

1/2 114200. 45

2/2 114230. 75 3s2 3p2 (3 P)4d 4d 4D z 153153. 66

48. 06

81. 08

130. 72

3/2 114279. 11 1/2 153201. 72

2Z 153282. 80

3s2 3p2 (3 P)3d 3d 2 F 2/2

3/2 114804. 11 115285. 31 481. 20 3/2 153413. 52

3s2 3p2 ( 3 P)4<2 4d 4P 2Z 155818. 37 -210. 91 -118. 91 3

2 3p2 (3 P)3d 3d 4P 2/2 115817. 0 -53. 4 —21. 9

1/2 156029. 28

1/2X

115870. 4

115892. 3 z 156148. 19

3s2 3p2 ( 3 P)4<2 4d 2F 2/ 156121. 33

482. 34 3s2 3p2 (3 P)3d 3d 2 P X

1/2 118146. 50

3/2 156603. 67

3s2 3p2 ( 3 P)4<2U 2 D IZ 158666. 45

160. 42

3s2 3p2 (3 P)3d 3d 2 D 1/2 2/2 119242. 13

119294. 70 52. 57 2/ 158826. 87

3s2 3p2 ( 3P)5p 5p 4 D° z 164118. 6

133. 4

195. 3

325. 4

3s2 3p2 (x D)4s 4s' 2 D 1/2 121528. 20

1. 29 VA 164252. 0

2/2 121529. 49 2Z 164447. 3

3Z 164772. 7 3s2 3p2 (3 P)4p 4p 2 S° z 125485. 32

3s2 3p2 ( x D)4cZ 4d' 2 F 3Z 164180. 63 -51. 15

3s2 3p2 (3 P)4p 4p 4D° z 127824- 93

151. 28

256. 86

366. 04

2Z 164231. 78

1/2 2/2 127976. 21 128233. 07 3s2 3p2 ( 3 P) bp 5p 4P° z 164279. 3

38. 1 142. 1 3/2 128599. 11 1/2 164817. 4 2/ 164459. 5

3s2 3p2 (3P)4p 4p 4P° z 129787. 71

70. 36 iz 129858. 07

276. 01 3s 4Z 2 3p2 ( x D)4d 4d' 2 G 164334. 94 -1. 77

2/2 ISO134. 08 3/ 164336. 71

3s2 3p2 ( 3 P)4p 4p 2D° ix 130641. 00

545. 86 3s2 3p2 ( 3 P)5p 5p 4 S° IZ 165002. 45

2Z 131186. 86

3s2 3p2 ( 3P)4p 4p 4S° iz 131028. 76 S III ( 3 P0) Limit 188824. 

October 1947.
185

S ii Observed Terms*

Config.

Is2 2s2 2

p

6 +

Observed Terms

3s2 3p3

3s 3p4

/3p3 4 S°

\ 3p3 2 P° 3p

3 2 D°

/ 3p4 4 P

\ 3p4 2 P

ns (n> 4) np ( n> 4) nd (n> 3)

3s2 3p2

( 3 P)nz / 4, 5s 4 P 4, 5p

4 S° 4, 5p4 P° 4, 5p4 D° 3, 4d 4 P 3, 4d 4 D 3 4d 4 F

\ 4, 5s 2 P 4p

2 S° 4p2 P° 4p2 D° 3d 2 P 3, 4d 2 D 3 4d 2 F

3s2 3p2 (

1 Y)nx’ 4s' 2 D 4p' 2 P° 4p' 2 D° 4p' 2 F° 4d' 2 F 4d' 2 G

*For predicted terms in the spectra of the Pi isoelectronic sequence, see Introduction.

S III

(Si i sequence; 14 electrons) Z=16

Ground state Is2 2s2 2p

6 3s2 3p2 3P0

3p

2 3P0 282752 cm-1 I. P. 35.0 ±0.4 volts

The present term list has been compiled from those published by Hunter and by Robinson,

although Ingram, Gilles, and others have contributed to the analysis.

Intersystem combinations connecting the singlet and triplet terms have been observed.

Robinson derives from his measures a correction of —6 cm-1 to be applied to all terms higher

than 140000 cm-1

. This correction has been introduced here. An estimated value of the

interval of 3p

3 3P°,0 is entered in brackets in the table.

The quintet terms suggested by Gilles have been omitted, awaiting further confirmation.

REFERENCES

S. B. Ingram, Phys. Rev. 33, 907 (1929). (I P) (T) (C L)

M. Gilles, Ann. de Phys. [10] 15 , 322 (1931). (I P) (T) (C L) (Z E)

A. Hunter, Phil. Trans. Roy. Soc. London [A] 233, 309 (1934). (I P) (T) (C L)

L. et E. Bloch, J. Phys. Rad. [7] 6, No. 11, 441 (1935). (C L) H. A. Robinson, Phys. Rev. 52, 724 (1937). (T) (C L)
186

S ill S III

Config. Desig. J Level Interval Config. Desig. J Level Interval

3s2 3p2 3p2 3 P 0

12

0. 0

297. 2

832. 5

297. 2

535. 3

3s2 3p(2 P°)3d 3d 3 D° 12

3

147550. 32

147690. 99

147744• 54

140. 67

53. 55

3s2 3p

3 3p2 X D 2 11320 3s2 3p(2 P°)4s 4s X P° 1 148397. 8

3s2 3p2 3p2 X S 0 27163 3s2 3p(2 P°)4p 4p

3 D 12

169770. 04

170067. 31 297. 27

3s 3p

3 Bp3 3 D° 1 84018. 9

27. 5

53. 1

3 170648. 94 581. 60

2 84046. 4

3 84099. 5 3s2 3p(2 P°)4p 4p

3 P 0

1 172631. 27

172785. 77 154. 50

405. 96 &s 3j)° 3p3 3 P° 2 98743. 0 - 22. 6 [- 6]

2 173191. 73

10 98765. 6

3s 2 3p(2 P°)4p 4p 3 S 1 174036. 19

3s 3p

3 3p3 >D° 2 1041597 3s2 3p(2 P°)4d 4d 3 F° 2

3 204578. 89205070. 75 491. 86

489. 92 3s 3p3 3p3 X P° 1 136839 4 205560. 67

3s 3p3 3p

3 3 S° 1 138061. 4 3s2 3p(2 P°)4d 4d 3 D° 1 206538. 87

132. 74

239. 36

2 206671. 61

3s2 3p(2 P°)3d 3d 3 P° 0 143095. 91 20. 28

7. 74

3 206910. 97

1 143116. 19

2 143123. 93 3s 2 3p(2 P°)5s 5s 3 P° 0 209773. 4

152. 7

771. 5

1 209926. 1 3s2 3p(2 P°)4s 4s 3 P° 0 146696. 19

40. 35

409. 46

2 210697. 6

1 146736. 54

2 147146. 00 3s 2 3p(2 P°)5s S iv (

2 P£)

5s X P°

Limit

1 211326. 8

282752

October 1947.

S hi Observed Terms*

Config.

Is 2 2s

2 2p8 +

Observed Terms

3s2 3p2 {3p2 X S 3p2 3 P

3

p

2 X D

3s 3p3 |3p

3

S° 3p

3 3 P°

3p3 X P°

3p

3 3 D°

3p

3 X D°

ns (n> 4) np (n> 4) nd (n> 3)

3s2 3p(2 P°)na; Or

Oi

GO

CO ^

h3

0

0 4p

3 S 4p3 P 4p3 D 3d 3 P° 3, 4d 3 D° 4d 3 F°

*For predicted terms in the spectra of the Si i isoelectronic sequence, see Introduction.
187

S iv

(A1 i sequence; 13 electrons) Z=16

Ground state Is2 2s2 2p6 3s2 3p 2P^

3p

2Py2 381541.4 cm-1

I. P. 47.29 volts

This spectrum is incompletely analyzed but 53 lines have been classified in the range

from 519 A to 3118 A. For the doublet terms the authors’ notation is entered in the first column of the table. The configurations are as given in Bacher and Goudsmit.

The quartet terms are from Bowen’s 1932 paper. No intersystem combinations have

been observed, as indicated by the uncertainty x. Bowen remarks that the relative positions

of the doublet and quartet terms are only approximately determined, by assuming that the

difference between the terms 4s 2S and 4s 4P° is equal to that between the terms 3s2 *S and

3p

3 P° in S v. REFERENCES

R. A. Millikan and I. S. Bowen, Phys. Rev. 25, 600 (1925). (I P) (T) (C L)

I. S. Bowen, Phys. Rev. 31, 37 (1928). (T) (C L) R. F. Bacher and S. Goudsmit, Atomic Energy States p. 404 (McGraw-Hill Book Co. Inc., New York, N. Y.$

and London, 1932). (T)

I. S. Bowen, Phys. Rev. 39, 13 (1932). (T) (C L)

L. Bloch et E. Bloch, J. Phys. Rad. [7] 6, No. 11, 441 (1935). (C L)

S IY S IV

Authors Config. Desig. J Level Inter- val Authors Config. Desig. J Level Interval

3P2 3s2

(

x S)3p 3v

2 P° X 0. 0

950. 2 4p2 3s2 0S)4p 4p 2P° X 213507. 4 210. 0

3pi i x 950. 2 4px 1 X 213717. 4

3s 3p2 3p

2 4P X 71840 +x ‘Z.A.A. 3s 3p(3 P°)3d 3d 4P° 2y2 222854 +z -289 VA 72184 +z 547 1/2 2231 43 +x

2y2 72731 +x X

bD2 3s 3p2 3p2 2 D i X 94101. 9

46. 2

3s 3p(3 P°)3d 3d 4D° X 224991 +x 103

100

80

bD3 2H 94148. 1 ix 225094 +x

X

2X 225194 +*

bS 3s 3p2 3p2 2 S 123503. 9 3X 225274 +x

bPi 6P2 3s 3p2 3p

2 2 P X

i X

133617. 9

134243. 9

626. 0 4d 3s2 (

x S)4d 4d 2D nx

\2X }255389. 8

3d2 3s2

(

x S)3d 3d 2 D 1 X 152127. 1 14. 3

3s 3p(3 P°)4s 4s 4P° X 263759 +x 346

636 3di 2y2 152141. 4 ix 264105 +x

2y2 264741 +x

4s 3s2

(

X S) 4s 4s 2 S X. 181432. 2

5s 3s 2

(

x S)5s 5s 2 S x

• 271010. 4

3p3 3p3 4S° l X 197110 +x

cP 3p3 3

p

3 2 P° I ix

\ X

^211368 S v (

x So) Limit 381541. 4

September 1947.
188

S iv Observed Terms*

Config.

Is2 2s2 2p

6 +

Observed Terms

3s2

(

x S)3p 3p

2 P°

3s 3p

2 { 3p

2 2 S

3p

2 4 P

3p

2 2 P 3p2 2 D

3p

3 |

3p3 4 S° 3p3 2 P°

ns (n> 4) np (n> 4) nd (n> 3)

3s2

(

x S)wx 4,5s 2 S 4p 2 P° 3, 4d 2 D

3s 3p(3 P°)na: 4s 4 P° 3d 4 P° 3d 4 D°

*For predicted terms in the spectra of the A1 i isoelectronic sequence, see Introduction.

S v

(Mg i sequence; 12 electrons) Z=16

Ground state Is2 2s2 2p* 3s2

3s2 584700 cm

-1

I. P. 72. 5± volts

This spectrum is incompletely analyzed, but Bowen has classified 30 lines in the range

between 437 A and 905 A. He gives absolute values for only the triplet terms, but lists the

singlet combination 3s2 ^o—Sp *P°, which has been used to calculate 3p

x Pi in the table.

By extrapolation along the isoelectronic sequence the writer has estimated the limit

3s2 % as approximately 584700 cm-1

, which places 3p 3Pj at 83071 cm-1 above the ground

state zero. These estimated values are entered in brackets in the table. The uncertainty, x, may be several hundred cm-1

. Bowen has estimated the error of the limit as probably not

greater than ± 1000 cm-1. REFERENCES

I. S. Bowen, Phys. Rev. 39, 8 (1932). (T) (C L)

I. S. Bowen, letter (Sept. 1947). (T)

S v Sv

Config. Desig. J Level Interval Config. Desig. J Level Interval

3s2 3s2 X S 0 0 3s(2 S)4s 4s »S 1 311670 +x

3s(2 S)3p 3p

3 P° 0 [88071]+x 362 3p(2P°)3d 3d 3 P° 2 345876 +x -374

-237 1 83488 +x 767 1 345750 +x

2 84800 +s 0 345987 +x

3s(2 S)3p 3p >P° 1 127149 3p(2 P°)3d 3d 3 D° 1 847883 +x 16ft 2 848051 +x 117 3pa 3p2 3P 0 200000 +x 417

769

3 848168 +x

1 200417 +x

2 201186 +x

3s(2S)3d 3d »D 1,2,3 234987 +z Svi (

2 Sh) Limit [584700]

September 1947.
189

S v Observed Terms*

Config.

Is 2 2s2 2p«+ Observed Terms

3s2 3s2 iS

3s(2 S)3p

{

3p

3 P°

3v

1 P°

3p

2 3p2 3 P

ns S' IV nd (n> 3)

3s (

2 S)nx 4s 3 S 3d 3 D

Zp(2 F°)nx 3d 3 P° 3d 3 D°

*For predicted terms in the spectra of the Mg i isoelectronic sequence, see Introduction.

S VI

(Na i sequence; 11 electrons) Z=16

Ground state Is2 2s2 2p& 3s

2S^

3s 2Sk 710194 cm'1 I. P. 88.029 ±0.003 volts

The terms are from Robinson, who has extended the earlier analysis by Bowen and Millik an. There are 29 classified lines, all but 2 of which are in the region between 171 A and 1117A.

The absolute value of the ground state was extrapolated along the isoelectronic sequence.

REFERENCES

I. S. Bowen and R. A. Millikan, Phys. Rev. 25, 295 (1925). (T) (C L)

H. A. Robinson, Phys. Rev. 52, 724 (1937). (I P) (T) (C L)

S vi S vi

Config. Desig. J Level Interval Config. Desig. J Level Interval

3s 3s 2 S x 0

5/ 5/ 2 F° {

2)4

l 3/2 |

551848

3V 3p

2 P° X 105874 1263

1/4 107187

5g 5g 2 G r 3/2 \ 4/2 }

552106

3d 3d 2 D l X 247420 32

2H 247452 6s 6s 2 S y2 573823

4s 4s 2 S H 362983 6p 6p

2 P° X

1/4 588679

4p 4p 2 P° y2 401164 457 ix 401621 6d 6d 2 D 1 iy2 l 2H }

596877

4d 4d 2 D 1)4 451785 23 2/2 451808

6/ 6/ 2 F° / 2/

1 3/ }

600170

4/ 4/ 2 F° / 2>4

l 3H j

462653

7d 7d 2 D / iy2 1 2/ }

627231

5s 5s 2 S y 504112

5p 5p

2 P° X 522080 218

7/ 7/ 2 F° / 2/

\ 3/ }

629895

1/2 522248

5d 5d 2 D IX

2/2 546021

546032 11 S vn (‘So) Limit 710194

June 1947.
(Ne i sequence; 10 electrons) Z=16

Ground state Is2 2s2 2p6 'So

2p& 'S0 2266990 cm"1 I. P. 280.99 volts

Ferner has classified 16 lines between 46 A and 72 A as combinations with the ground

term, and generously furnished his analysis in advance of publication. The term designations he assigns on the assumption of AS'-coupling are given in the table uuder the heading

“Author.”

As for Ne i, the ^-coupling notation in the general form suggested by Racah is introduced.

Ferner’s unit, 103 cm-1

, has here been changed to cm-1

. REFERENCES

G. Racah, Phys. Rev. 61, 537 (L) (1942). E. Ferner, Ark. Mat. Astr. Fys. (Stockholm) 36A, No. 1, p. 62 (1948). (I P) (T) (C L)

S vii S vii

Author Config. Desig. j Level Author Config. Desig. J Level

2p

iS0 2p« 2p« J S 0 0

2p6

(

2 Pf«)5s 5s [i y2]° 2

5s 3 Pi 1 1998920

2p6

(

2Pfo)3s 3s [1 y2]° 2

3s *Pj 1 1376220

2p3

(

2P£)3s 3s' [HI

0 0

CO } 2s 2p6

(

2S)3p /spo 3p |ip° }

i 2000400

3s iPx 1 1388330

5d »Pj 2p3 (Pfo)5d 5d [1^]° 1 2046080

2p®(2P!H)3d 3d [H]° 0

3d

8Pj 1 1624770 5d 3Dj 2ps

(

2P£)5d 5d' [1^]° 1 2055630

3d iPj H

3d [i y2]° 1 1644630

6d iPi 2p5

(

2Pfo) 6d 6d [l/2]° 1 2113850

3d 3Di 2p6

( 2P&)3d 3d' [i y2]° 1 1662210

6d 3Dj 2p5

(

2P£)6d 6d' [1^1° 1 2123230

2p6

(

2 Pfo)4s 4s [i y2]° 2

2p5

(

2 P£)7d 7d' [l/2 4s 3Pj 1 1820230 7d 3Dj ]° 1 2163940

2p6

(

2P£)4s 4s' [y2]° 0

4s *Pi 1 1829760

S vm (

2 Pfo) Limit 2266990

4d iPi 2p6

(

2Pfo)4d *d [i yr 1 1919500

S vm ( 2 P^) Limit 2277120

4d 3 Di 2ps (

2P£)4d 4d' [i y2]° 1 1930240

August 1947.
S vii Observed Levels*

Config.

Is2 2s2 +

Observed Terms

2p

6 2p

6 iS

ns (n> 3) nd (n> 3) np (n>3)

2pi

( 2P°)nx / 3-5s 3 P°

\ 3-4s 'P° 3d 3 P° 3-7d 3 D°

3-6d ‘P0

2p6

(

2S)nx CO o

o

jZ-Coupling Notation

Observed Pairs

ns {n> 3) nd (n> 3)

2p5 (

2 Pix)nx 3-5s [1 y2]° 3d [ yr

3-6d [134]° 2ps

(

2 P£)nx' 3-4s' [ y2]° 3-7d' [134]°

*For predicted levels in the spectra of the Ne i isoelectronic sequence, see Introduction.

S viii

(F i sequence; 9 electrons) Z= 16

Ground state Is2 2s2 2pb 2P^

2p* 2P

0m 2652720 cm"1 I. P. 328.80 volts

The analysis was furnished by Ferner in advance of publication. He has classified 44

lines in the interval between 44 A and 65 A. All but one of the observed combinations are with the ground term. In addition, Robinson has classified a pair of lines at 202.605 A and

198.550 A as 2p

b 2P°-2p* 2S. Ferner’s unit, 103 cm-1

, has here been changed to cm-1

. REFERENCES

H. A. Robinson, Phys. Rev. 52, 724 (1937). (C L)

E. Ferner, Ark. Mat. Astr. Fys. (Stockholm) 36A, No. 1, p. 57 (1948). (I P) (T) (C L)
102

S viii S vin

Author Config. Desig. J Level Interval Author Config. Desig. J Level Interval

2V

2 P2

2 Pi

2s2 2p

5 2p5 2 po l H

y

0

101 SO

-10130 3d 2 St 2s2 2p4 (

1 D)3d 3d' 2 S y 1894330

2 Si 2s2 2p 4 (

! D)3d 3d' 2 F 3y

2p' 2s 2p

6 2 2 S H 503590 3d 2 F3 2y 1895520

3s 4 p3

4 p2 2s2 2p4

(

3 P) 3s 3s 4 P 2%

1 X

1559580

1565250 -5670

-4040

Id 2 d3

2 D2 2s2 2p4

(

4 S)3d 3d" 2 D 2H

i y

1952100

1953010 -910

4 P1 y 1569290

3s' 2 p2 2s 2p5

(

3 P°)3s 3s'" 2p° 1/2 2088530 -6510 3s 2 P2 2s2 2p4

(

3 P)3s 3s 2 P i H 1579700 -6950

2 P1 y 2045040

2 P1 y 1586650

4s 2 P2 2s2 2p4

( 3 P)4s 4s 2 P 1 y 2102340 -8900 3s 2 d3 2s2 2p4 (

x D)3s 3s' 2 D 2y2 1623380 -230 2 P1 y 2111240

2 D2 iy2 1623610

2s2 2p4 (

3 P)4d 4d 4 P y

3s 2 Si 2s2 2p4 (

1 S)3s 3s" 2 S y2 1688170

4d 4 P3 1 y

2y2 2199830

2s2 2p4

(

3 P)3d 3d 4 D 3y

3d 4d3 2 y 1831370 4d 2 d2 2s 2 2p4

(

3 P)4d 4d 2 D iy 2204100 4430

i yi/ 1822510 2 d3 2/4 2208530

/2 2s2 2p4 (

3 P)4d 4d 2 P y2 2s2 2p4 (

3 P)3d 3d 4P y 4d 2 P2 1 y 2207770

3d 4 P2

4 p3

1 y

2%

1834830

1838740 3910 4d 2 Si 2s2 2p 4 (

4 D)4d 4d' 2 S y 2253570

3d 2 P1 2s2 2p4

(

3 P)3d 3d 2 P y 1839250 8300 2s2 2p 4

(

x D)4d 4d' 2p 3 y

2 P2 i y 1847550 4d

2 F3 2}4 2254790

3d 2 D2 2s2 2p4 (

3 P)3d 3d 2 D 1 y

2K

1842770

2 5040 d3 1847810

Six ( 3 P2 ) Limit 2652720

3d 2 P1 2s2 2p4 (

1 D)3d 3d' 2 P y 1888460

2 9000 P2 i y 1897460

3d 2 d3 2s2 2p4 (

x D)3d 3d' 2 D 2Vt 1892000 -6220 2 D2 i y 1898220

August 1947.

S viii Observed Terms*

Config.

ls2 +

Observed Terms

2s2 2p5 2p

s 2po

2s 2p6 2p 6 2 S

ns (n> 3) nd (n> 3)

/

3s 4 P 3, 4d 4 P 3d 4 D 2s2 2p4 (

3 P)nx

l 3, 4s 2 P 3, 4d 2 P 3, 4d 2 D

2s2 2p4 (

1 D)nx' 3s 1 2 D 3, 4d' 2 S 3d' 2 P 3d' 2 D 3, 4d' 2 F

2s2 2p4 (

x S) nx" 3s" 2S 3d" 2 D

2s 2p5

(

3 P°)nx'" 3s'" 2 P°

For predicted terms in the spectra of the Fi isoelectronic sequence, see Introduction.
(O i sequence; 8 electrons) Z= 16

Ground state Is2 2s2 2p4 3P2

2p4 3P2 3057300 cm"1 1. P. 378.95 volts

Ferner has found 17 terms and classified 21 lines in this spectrum in the range from 46 A

to 56 A. No intersystem combinations have been observed and the uncertainty, x, may be

large. The unit adopted by Ferner, 103 cm-1

, has here been changed to cm-1

. REFERENCE

E. Ferner, Ark. Mat. Astr. Fys. (Stockholm) 36A, No. 1, p. 48 (1948). (I P) (T) (C L)

S IX S IX

Config. Desig. J Level Interval Config. Desig. J Level Interval

2s2 2

p

4 2

p

4 3P 2

10

0 7970

10630

-7970

-2660

2s2 2p3

(

2 D°)3d

2s2 2p3

( 2D°)3d

3d' 'D°

3d' 3 S°

2

1

21 171 40 +x

2125310

2s2 2

p

4 2

p

4 4 D 2 58000 +z 2s 2 2p3

(

2 D°)3d Pm O

"b CO 3 2134410+x

2s2 2

p

4 2p4 iS 0 122300 +z 2s 2 2p3

(

2 P°)3d

T3 o CO 0

1 2144820

1790

2s2 2p3

(

4 S°)3s 3s 3 S° 1 1783150 2 2146610

2s2 2p3

( 2D°)3s 3s' 3 D° 3 1845770 -570 2s2 2p3

( 2 P°)3d CO 0 4

2 1846340 3

1 2 2154570

2s2 2p3

(

2 D°)3s 3s' 1 D° 2 1858500+x 2s 2 2p3

( 2 P°)3d 3d" 3 D° 3

o 2156430

2s2 2p3

(

2 P°)3s 3s" ip° 1 1904040+x 1

2s2 2p3 (

4 S°)3d 3d 3 D° 1,2 2035220 650 2s2 2p3

(

2 P°)3d 3d" l F° 1 2162470+x

3 2035870

2s2 2p3 (

2 D°)3d 3

d' 3 D° 3, 2,1 2108190

S x (

4 Si*) Limit 3057300

2s2 2p3

(

2 D°)3d 3

d' 3 P° 2 2116450 -2730

102119180

August 1947. S ix Observed Terms*

Config.

ls2 +

Observed Terms

2s2 2

p

4 {2p4 is 2

p

4 3 P

2

p

4 4 D

ns (n> 3) nd (n> 3)

2s2 2p3

(

4 S°)na: 3s *S° 3d 3 D°

2s2 2p3 (2 D°)nx'

{

3s' 3 D°

3s' 1 D°

3d' 3 S° 3d' 3 P° 3d' 3 D°

3d' !D° &0 CO 1

2s2 2p3

(

2 P°)nz"

{ 3s" »P° 3d" 3P°

3d" iP° 3d" ! D° 3d" *F°

*For predicted terms in the spectra of the 0 i isoelectronic sequence, see Introduction.
194

Sx

(N i sequence; 7 electrons) Z=16

Ground state Is2 2s2 2p3 4S?^

2p3 4Sjh 3615900 cm-1

I. P. 448.2 volts

The spectrum is very incompletely analyzed. Ferner has classified 4 lines between 44 A

and 47 A and has generously furnished these classifications in advance of publication. The

terms in the table have been derived from Ferner’s data, adjusted by Robinson to fit the

isoelectronic sequence data. All entries in brackets have been extrapolated along the isoelectronic sequence by Robinson. No intersystem combinations have been observed and the

uncertainty, x, probably exceeds ±1000 cm-1

. Ferner’s unit, 103 cm-1

, has been changed to cm-1 in deriving the term values.

REFERENCES

E. Femer, Ark. Mat. Astr. Fys. (Stockholm) 36A, No. 1, p. 42 (1948). (C L)

H. A. Robinson, unpublished material (March 1948). (I P) (T)

S X

Config. Desig. J Level Interval

2s2 2p3 2

p

3 4 S° 1/2 0

2s2 2

p

3 2p3 2p° X

1/

[122230]+x

[128780]+x

[1500]

2s2 2p2

( 3 P)3s 3s 4P X

i/2 2/2092360

2098460 6100

2s2 2p2

(

3 P)3d 3d 2 D 1 X 2375140 -)-x 2160 2/ 2377300 +x

S xi (

3 P0) Limit --- [3615900]

March 1948. S XII

(B i sequence ; 5 electrons) Z=16

Ground state Is2 2s2 2p

2P%

2p

2P% cm-1

I. P. volts

By extrapolation along the B i isoelectronic sequence, Edlen estimates that the separation of the lowest term, 2p

2Fy2 —2p 2Pfo, is 13266 cm-1 (7536 A).

REFERENCE

B. Edl<5n, Zeit. Astroph. 22, 58 (1942). (T)

July 1948.
195

CHLORINE

Cl I

17 electrons Z=17

Ground state Is2 2s2 2p6 3s2 3p

5 2P°^

3p5 2Pi^ 104991 cm-1

I. P. 13.01 volts

Most of the terms are from the analysis by Kiess, who has revised and extended the earlier

work on this spectrum. Green and Lynn have observed the Zeeman effect and, with the aid

of 0-values, added a few terms to the list by Kiess. They list 11 unclassified lines for which

both ^-values are known.

Their miscellaneous levels are labeled in the table with numbers assigned by the writer,

followed by their tentative designations entered in parentheses.

Intersystem combinations, connecting the doublet and quartet terms, have been observed

REFERENCES

L. A. Turner, Phys. Rev. 27, 401 (1926). (C L)

O. Laporte, Nature 121, 1021 (1928). (C L)

C. C. Kiess, Bur. Std. J. Research 10, 827, RP570 (1933). (I P) (T) (C L)

B. Edl<§n, Zeit, Phys. 104, 413 (1937). (I P) (C L)

W. F. Meggers, J. Opt. Soc. Am. 36, 431 (1946). (Summary hfs)

J. B. Green and J. T. Lynn, Phys. Rev. 69, 165 (1946). (T) (C L) (Z E)

L. Davis, Jr., B. T. Feld, C. W. Zabel, and J. R. Zacharias, Phys. Rev. 73, 525 (L) (1948). (hfs)

Cl I Cl I

Config. Desig. J Level Interval Obs. g Config. Desig. J Level Interval Obs. g

3s2 3

p

5 3p5 2po

X

0

881 -881 3s2 3p4

(

3 P)4p 4p 2 S° X 85289. 98 1. 280

3s 2 3p4 (

3P)4p 4p 2P° 1 X 85438. 04 -475. 40 1. 327

3s2 3p4

( 3P)4s 4s 4P 71954. 00 -530. 20

-338. 44

1. 599 X 85913. 44 1. 379

X

72484. 20

72822. 64

1. 722

2. 652 3s2 3p4

(

3 P)4p 4p 4 S° ix 85780. 68 1. 877

3s 2 3p4 (

3P)4s 4s 2P 1/2 74221. 44 -639. 80 1. 340 3s2 3p 4 (

J D)4p 4p' 2P° IX 94809. 67 -154. 83 1. 328

X 74861. 24 0. 663 X 94494. 50 0. 872

3s2 3p4 (

3P)4p 4p 4 P° 2% 89914. 54 -212. 05

-233. 96

1. 591 3s2 3p4 (

3 P)5p 5p

4P° 2/2 94477. 98 -181. 35

-310. 15

1. 559

ix

X

88126. 59

83860. 55

1. 723

2. 617

1/2X

94659. 28

94969. 43

1. 722

2. 309

3s2 3p4 (

3 P)4p 4p 4 D° 3 H 88889. 64 -238. 26

-353. 01 -203. 36

1. 422 3s2 3p4 (

3 P)5p 5p4D° 3X 94727. 91 -94. 84 1. 420

2X 84187. 90 1. 308 2y2 94822. 75 1. 247

1 X 84480. 91 1. 163 ix 95809. 48 -221. 08 1. 147

X 84684. 87 0. 059 X 95530. 51 1. 409

3s2 3p4 0D)4s 4s' 2 D 2X 84115. 68 -1. 70 3s 2 3p4

(

! D)4p 4p' 2 F° 2X 95140. 05

35. 95

1 X 84117. 38 3X 95176. 00

3s2 3p4 (

3 P)4p 4p 2 D° 2/2 84648. 69 -340. 35 1. 269 3s2 3p4 (

3 P)5p 5p 2D° 2X 95896. 81 -305. 70 1. 352

1/2 84984. 04 0. 986 I /2 95702. 01 1. 321
196

Cl I—Continued Cl I—Continued

Config. Desig. J Level Interval Obs. g Config. Desig. J Level Interval Obs. g

3s 2 3p4

(

3 P) bp 5p2 S° X 95598. 28 0. 699 3s 2 3p4 (

3 P)5d 5d

4 F 4X 99513. 68 - 150. 47

-97. 37

-183. 90

1. 310

3

2 3p4 ( 3P)5p 5p 4 S° i X 95608. 80 1. 531

3/2

2/2 99664. 15

99761. 52

1. 181

1. 149

IX 99945. 42 1. 240

3s 2 3p 4 ( 3P)4d 4d 4 D 3/2 95696. 49 -85. 92

-110. 75

-98. 02

2y2 95782. 41 1. 367 3s2 3p4

( 3 P)4d 4d 2 P ix 99530. 10 -176. 90 1. 306

1/2X

95893. 16

95991. 18

1. 209

0. 00

y2 99707. 00 1. 289

3s2 3p 4 ( 3 P) 6p 1° ( 2 D?) vx 99564. 7 1. 32

3s 2 3p 4 (

3 P) 5p 5p

2po

1 X 96808. 84 -280. 80 1. 286 x 96589. 64 0. 712 3s2 3p4 ( 3P)6p 2° (

4 D°?) X 99582. 7 0. 49

3s2 3p4

(

1 D)4p 4p' 2 D° 2y2 96478. 38 -3. 32 3s 2 3p4

(

3 P) 7s? 1 (

4 P?) 1 X 99677. 1 1. 73

1 X 96481. 70 0. 867

3s2 3p4 (

3 P) 6p 6p

2 P° 1 X 99819. 8 -79. 4

1. 28

3s2 3p4 (

3P)4<3 4d

4 F 4x 96490. 40 -236. 41 -214. 49

-314. 25

X 99899. 2 0. 81 3X 96726. 81 2y2 96941. 30 1. 097 3s 2 3p 4 (

3 P)7s? 2 (

2 P?) y2 99968. 1 1. 21

1 X 97255. 55 0. 967

3s 2 3p4 (

3 P)5d 5d 4 P 2y2 99984. 30 -248. 70

65. 88

1. 589

3s 2 3p4 (

3 P)4d 4d 2 F 3y2 96829. 85 -350. 09 IX 100233. 00

2y2 97179. 94 y2 100167. 12 1. 470

3s2 3p4

(

3 P)6s 6s 4 P 2y2 97233. 37 -242. 83

-619. 76

1. 500 3s2 3p 4 (

3 P) 7s? 3 (

2 P?) 1 X 100046. 5 1. 42

iX

X

97476. 20

98095. 96

1. 393

1. 962 3s2 3p4 (

3 P)5d 5d 2 F 3y2 100142. 41 -442. 87 1. 210

2/2 100585. 28 1. 069

3s2 3p4

( 3 P)4d 4d

4P 2x 97334. 60 706 20 1. 241

1. 620 1/2X

98040. 80

98641. 22 -600. 42 3s2 3p4 (

3 P)5d 5d 2 D 2/2

1 X

100245. 32

100342. 98 -97. 66

3s 2 3p4

( 3 P)4d 4d

2D 2/2 97529. 85 -273. 61 1. 355 3s2 3p4 (

3 P)5d 5d 2 P 1 X

y2 100700. 3 -33. 1

1. 65

1/2 97803. 46 100733. 4 1. 59

3s2 3p4

( 3P)6p 6p

4pO 2X 3s 2 3p4 (

3 P) 6d 6d 4 D y2 100941. 9

99. 7

6. 9

-62. 87

1. 010

iy

X

1/2 101041. 6 1. 168

98911. 6 1. 91 2x

3x

101048. 47

100985. 60

1. 364

1. 377

3s2 3p4

(

3 P)6p 6p4 D° 3X

2X 3s 2 3p4

(

3 P)6d 4 (

4 F?) 134? 101219. 0 1. 20

1 xX

99015. 1 1. 32

3s 2 3p 4

( 3 P) 6d 5 (

4 P?) 2/2 101422. 4 1. 60

3s2 3p4 (

3 P)5d 5d

4D 3X 99196. 02 -68. 69

-85. 51 -53. 39

1. 392 3s2 3p4

( 3 P)6d 6 y2 101587. 4 0. 69

2/4

1 y

99264. 71

99350. 22

1. 358

3s2 3p4

( 3 P) 6d 7 ( 2 F?) 2y2 101855. 0 1. 45

X 99403. 61 0. 363

Cl 11 (

3 P2) Limit 104991

January 1948. Terms*Cl i Observed *

Config.

Is2 2s2 2p0+

3s2 3p

6

3s2 3p4 (

3 P)nx

3s2 3p4 (*D)nx'

Observed Terms

3p

5 2p°

ns (n> 4) np (n> 4) nd (n> 3)

/ 4,6s 4 P

t 4s 2 P

4s' 2 D

4, 5p

4 S° 4-6p 4 P° 4-6p 4 D°

4, 5p

2 S° 4—6p 2 P° 4, 5p2 D°

4p’ 2 P° 4p’ 2 D° 4p' 2 F°

4, 5d

4 P 4^6d

4 D 4, 5d 4 F

4, 5d 2 P 4, 5d 2 D 4, 5d 2 F

*For predicted terms in the spectra of the Cl i isoelectronic sequence, see Introduction.
(S i sequence; 16 electrons) Z=17

Ground state Is2 2s2 2p6 3s2 3

p

4 3P2

3^43P2 192000 cm-1

I. P. 23.80 volts

The terms are from the paper by Kiess and de Bruin, who have summarized, revised, and

extended the earlier analysis by Murakawa and others. They give a complete list of classified

lines; it extends from 558 A to 9483 A. Intersystem combinations connecting all three systems

of terms, have been observed.

The two unclassified levels designated by them as x' and x" are here labeled 1 and 2,

respectively. The term they list as 4s' 3P is entered as “3P” since its configuration is not

definitely known.

The estimated position of 3

p

4 *S given by Edlen, is entered in brackets in the table.

REFERENCES

C. C. Kiess and T. L. de Bruin, J. Research Nat. Bur. Std. 23, 443, RP1244 (1939). (I P) (T) (C L) (G D)

B. Edl6n, Phys. Rev. 62, 434 (1942). (T)

S. Tolansky, Zeit. Phys. 74, 336 (1932). (hfs) S. Tolansky, Zeit. Phys. 73, 470 (1931). (I S) cm cm

Config. Desig. J Level Interval Config. Desig. J Level Interval

3s2 3p4 3p4 3 P 2

10

0

697

996

-697

-299

3s2 3p3 (

2 D°;3d

3s2 3p3

(

4 S°)4p

3d' iP°

4p

6P

1

1

127726. 9

128621. 9

40. 6

67. 3

2 128662. 5

3s2 3p* 3p* iD 2 11652 3 128729. 8

3s2 3p* 3p

i J S 0 [27900] 3s2 3p3

(

2 D°)4s 4s' !D° 2 129065. 4

3s 3p5 3p5 3po 2 93866. 6 -632. 1 -334. 1

3s2 3p3

(

4 S°)4p 4p

3 P 2 131767. 4

12. 6 -13. 2

10

98998. 7

94382. 8

10

131754. 8

131768. 0

3s2 3p3

(

4S°)4s 4s ®s° 2 107878. 5 3s2 3p3

(

2 D°)3d 3d' 3 G° 3 182162. 1

11. 3

17. 9 4 182173. 4

3s2 3p3

(

4S°)3d 3d 5D° 4 110295. 8 -1. 0

5 132191. 3

3 110296. 8

2 110299. 5

z. / 9 ^ 3s2 3p3 (

2 P°)4s 4s" 3P° 0 187770. 1 34 3

10110802. 0

110808. 5

-1. 5

12 137804. 4

187877. 6

73. 2

3s2 3p3

(

4 S°)4s 4s 3 S° 1 112608. 0 3s2 3p3

( 2 P°)4s 4s" 1 P° 1 138623. 0

3s 3p

5 3p

3 ipo 1 115656. 4 3s2 3p3

(

2 P°)3d 3d" ip° 1 189350. 0

3s2 3p3 (

4 S°)3d 3d 3D° 3 119809. 9

10. 9 -43. 1

3s2 3p3

(

2 P°)3d 3d" >D° 2 140259. 1 2 119799. 0

1 119842. 1 3s2 3p3

(

2 P°)3d 3d" 3 D° 1 140740. 0 270 0

2 141010. 0

339. 6

3s2 3p3

(

2 D°)3d 3d’ iD° 2 121498. 6 3 141349. 6

3s2 3p3

( 2 D°)3d 3d’ iF° 3 121635. 1 3s2 3p3 (

2 P°)3d 3d" 3F° 4 143996. 3 178 9

3s2 3p3

(

2 D°)3d

3 144174. 5 169 1 3d' 3p° 2 126031. 8

187. 3

237. 5

2 144343. 6

3 126219. 1 4 126456. 6 3s2 3p3

(

2 D°)4p 4p' *P 1 145468. 5

3s2 3p3

( 2 D°)4s 4s' 3 D° 1 126725. 1 18. 2

39. 5

3s2 3p3

(

2 P°)3d 3d" 3 P° 0

2 126743. 8 1 3 126782. 8 2 146012. 9
198

Cl n—Continued Cl n—Continued

Config. Desig. J Level Interval Config. Desig. J Level Interval

3s2 3p3

(

2 D0 j4p 4p' 3 D 1 146330. 0

3. 8

135. 2

3s2 3p3 (

4 S°)5d 5d 6D° 0

2 146333. 8 1 3 146469. 0 2 705759. 1

0. 5

0. 6 3 169799. 6

3s 2 3p3

(

2 D°) 4p 4p' 3F 2 147053. 7 72 0 4 169800. 2

3 147125. 7

72. 7 4 147198. 4 3s2 3p3

(

2 D°)5s 5s' 3 D° 1 170514. 7

20. 4

40. 4 2 170535. 1 3s2 3p3

(

2 D°)4p 4p' iF 3 147605. 7 3 170575. 5

3s2 3p3

(

2 D°)4p 4p' 3 P 2 149798. 3 -154. 1 -66. 6

3s2 3p3

(

4S°)5d 5d 3D° 3 170973. 6 -32. 2 -45 7

1 149952. 4 2 171005. 8

0 150019. 0 1 171051. 5

3s2 3p3

( 2 D°)3d 3d' 3p° 2 150681. 4 — 131. 3

3s2 3p3

( 2 D°) 5s 5s' iD° 2 171209. 2

1 150812. 7 0 3s2 3p3

( 2 D°)4d 4d' 3p° 2 172572. 6

77. 7

90. 6 3 172650. 3

3s2 3p3

( 2 D°)3d 3d' 3D° 3 151092. 7

74. 1 -115. 2

4 172740. 9

2 151018. 6

1 151133. 8 3s2 3p3

( 2 D°)4d 4d' 3 G° 3 173222. 7

21. 2

33. ft 5g° 4 173243. 9

3s2 3p3

(

4 S°)5s 5s 2 152233. 1 5 173277. 5

3s2 3p3

(

2 D°)4p 4p' iD 2 153257. 0 3s2 3p3

( 2 D°)4d 4d' iF° 3 174045.

3s 2 3p3

( 2 D°)3d 3d' 3 S° 1 153571. 2 2 2 174256. 3

3s2 3p3

(

4 S°)5s 5s 3 S° 1 153633. 1 3s2 3p3

( 2 D°)4d 4d' 3D° 1 174785. 7 34 9

32. 0 2 174820. 6

3s2 3p3

(

4 S°)4d 4d ®D° 0 154616. 7

1. 1

1. 8

3. 0

1. 2

3 174852. 6

1 154617. 8

2 154619. 6 3s2 3p3

( 2 D°) 4d 4d' 3 S° 1 177433. 1 3 154622. 6

3s2 3p3

( 4 154623. 8

2 D°) 4d 4d' 3p° 0 177693. 6

60. 6

3p° 62. 7

1 177754. 2 3p5 (ap°)4s 4svn 2 157076. 6 -590. 2 -290. 0

2 177816. 9

1 157666. 8

0 157956. 8 3s2 3p3

( 2 D°)4d 4d' iD° 2 178539. 1

3s2 3p3

( 2 P°)4p 4p" 3S 1 158177. 1 3s 2 3p3

(

2 D°)4d 4d' ipo 1 179867. 0

3s2 3p3

(

2 P°)4p 4p" J D 1 158723. 7 44 9

17. 8

3s 2 3p3

(

2 P°)5s 5s" 3p° 0 182337. 9

34. 4

76. 4 2 158768. 6 1 182372. 3

3 158786. 4 2 182448. 7

3s2 3p3 (

2 P°)4p 4p" 3 D 2 159574. 2 3s2 3p3

( 2 P°)4d 4d" 3F° 4 184628. 1 -27. 1 3 184655. 2 0 0 3s 3p4 (?)4s 8p 0 159840. 3

159. 3

143. 8

2 184658. 4

1 159999. 6 2 160143. 4 3s2 3p3

( 2 P°)4d 4d" 3po 2 185765. 0 -140. 4

1 185905. 4

3s2 3p3

( 2 P°)4p 4p" ip 1 161348. 4 0

3s2 3p3

( 2 P°)4p 4p" 3p 2 161634. 9 -19. 9 -16. 2

3s2 3p3

( 2P°) 4d 4d" 3D° 1 1 161654. 8 2 0 161671. 0 3 185865. 2

3s2 3p3

(

4S°)4d 4d 3D° 3 161796. 5 -111. 2 -82. 1

3s2 3p3

(

2 D°)6s 6s' 3D° 1 186844- 8 in 7 2 161907. 7 2 186861. 0

37. 3

1 161989. 8 3 186898. 3

1 2 164210. 7 3s 2 3p3

( 2 D°)6s 6s' ID0 2 187141. 4

3s2 3p3

(

2 P°)4p

3s2 3p3

(

4 S°)6s

3s2 3p3

(

4 S°)6s

4p"

6s

3S 0 165362. 1

®s° 2 168673. 6 Cl hi (

4SfH) Limit 192000

6s 3g° 1 169246. 6

January 1948.
Cl ii Observed Terms*

Config.

Is2 2s2 2p8 +

Observed Terms

3s2 3p4 {

3p4 3 P

3p4 *D

3s 3p

5 {

3p5 spo 3p5 X P°

ns (n> 4) np ( n> 4)

3s2 3p3 (

4S°)nx /4-6s 5S°

\4r-6s 3 S°

4p

5P

4p

3 P

3s2 3p3 (

2 D°)nx' 4-6s' 3 D°

4r-6s' *D°

4p' 3 P

4p' ip

4p' 4p'

3 D

iD

4p' 3 F

4p' *F

3s2 3p3

(

2 P°)nx"

{

4,5s" 3 P°

4s" iP° 4p" 3 S 4p" 4 S

4p" 3 P

4p" 4 P

4p"

4p"

3 D

iD

3p5 (

2 P°)nxVI1 4s V11

P°

nd {n> 3)

3s 2 3p3 (*S°)nx

3-5d

5 D°

3-5d 3 D°

3s2 3p3

(

2 D°)nx' |3, 4d' 3 S° 3, 4d' 3 P°

3,4d' 4 P°

3,4d' 3 D°

3, 4d' 1 D°

3, 4d' 3F°

3, 4d' iF°

3, 4d' 3 G°

3s2 3p3

(

2 P°)nx" 3, 4d" 3 P°

3d" ip°

3, 4d" 3 D°

3d" 4 D°

3, 4d" 3F°

*For predicted terms in the spectra of the S i isoelectronic sequence, see Introduction.

Cl m

(P i sequence; 15 electrons) Z= 17

Ground state Is2 2s2 2p6 3

2 3

p

3

3p3 4SiM 321936 cm-1

I. P. 39.90 volts

The terms are from Bowen, who has greatly extended the early work on this spectrum.

About 300 lines have been classified, and the observations range from 406 A to 4971 A. Inter- system combinations connecting the doublet and quartet terms have been observed.

Bowen remarks that because of perturbations the designations of the doublet levels of

the 3d configuration are somewhat uncertain.

REFERENCES

I. S. Bowen, Phys. Rev. 31, 35 (1928). (I P) (T) (C L)

I. S. Bowen, Phys. Rev. 45, 401 (1934). (I P) (T) (C L)
200

Cl III Cl III

Config. Desig. J Level Interval Config. Desig. J Level Interval

3s2 3p

3 3p3

S° 1 X 0. 0 3s2 3p2

( 3 P) 4p 4p 4 P° X 204021. 6

102. 4

417. 2 i X

1/2 204124. 0

3s2 3p

3 3p3 2 D° 18053

67 2/2 204541. 2

2/2 18120

3s 2 3p2

( 3 P)4p 4p 2 D° ix 205037. 3

909. 6 3s2 3p

3 3p

3 2po X

i/2 29812

95 2M 205946. 9

29907

3s2 3p2

( 3 P)4p 4p 4 S° IX 205938. 5

3s 3p 2/2 4 3p4 4 P 98520 -610

-345 1 /4 99130 3s2 3p2

( 3 P) 4p 4p 2 P° n 209042. 1 140. 7

Vi 99475 1/2 209182. 8

3s2 3p2

( 3 P) 3d 3d 4F 1V2 146525. 6

294 3

3s 2 3p2

(

x D)4p 4p' 2 F° 2 H 216524. 6

185. 8 2 y2 3>2 146749. 9 147073. 0

323. 1 424. 9

3/2 216710. 4

4K 147497. 9 3s2 3p2

(

x D)4p 4p' 2 D° 2J4 iy2 217850. 2

217913. 1 -62. 9

3s2 3p2

( 3 P) 3d 3d 4 D X 151946. 4 -66. 5 -31. 3

104. 9

1 x 151879. 9 3s 2 3p2

(

x D)4p 4p' 2 P

° X 221862. 9

237. 8

2'A 3V2 151848. 6 151953. 5 IX 222100. 7

3s2 3p2

(

3 P)4d 4d 4 F vx 239506. 3

223. 6

345. 3

493. 2

3s2 3p2

(

3 P)4s 4s 4 P X

1/2 2X

173736. 0

174093. 8

174613. 9

357. 8

520. 1

2/2 3/2

4/2

239729. 9 240075. 2 240568. 4

3s2 3p2

( 3 P)4s 4s 2 P V2 178369. 7

706. 4

3s2 3p2

( 3 P)4d 4d 4 D X 241559. 4

13. 0

112. 7

361. 1

1/2 179076. 1 1/2 241572. 4

2/2 241685. 1 3s2 3p2

( 3 P)3d 3d 4P 2 Vo 179495. 2 -168. 3 -117. 5

3}/2 242046. 2

I /2 179663. 5

/4 179781. 0 3s 2 3p2

( 3 P)4d 4d 4 P 2 X

1 X

242822. 8 243080. 7 -257. 9 - 126. 5

3s 2 3p2

( 3 P) 3d 3d 2 D 1 y2 182076. 3

966. 4

243207. 2

2/2 183042. 7

3s2 3p 2

( 3 P)3d 3d 2 P 1/2 185838. 3 -382. 1

3s2 3p2

(

3 P)4d 4d 2 F 2/2 3X

243828. 4

244684. 9

856. 5

186220. 4

3s2 3p2 (

x D)4s 4s' 2 D 2H 188390. 1 -58. 0

3s2 3p2

(

3 P)5s 5s 4 P y2 in

244951. 5 245392. 4

440. 9

744. 8

1/2 188448. 1 2/2 246137. 2

3s2 3p2

(

xD)3d 3d' 2 D 2

x/2 194959. 5 -308. 7

3s2 3p2

( 3 P) 4d 4d 2 D 1/2 248528. 2

129. 5

l

x/2 195268. 2 2/2 248657. 7

3s2 3p2

(

x D)3d 3d' 2F 2H 196137. 9

17. 9

3s2 3p2

(

x D)4d 4d' 2 D 1/2 254612. 7? W 70. 7 196155. 8 2V2 254683. 4?

3s2 3p2

(

x D)3d 3d' 2 P v2 198835. 5

148. 4

3s 2 3p2

(

x D)4d 4d' 2 F 3H 255086. 3 -54. 1 1/4 198983. 9 2/2 255140. 4

3s 2 3p2 (

3 P) 4p 4p 4 D° H

1/2 201073. 4 258. 6

433. 1 602. 5

3s2 3p2

(

x D)5s 5s' 2 D 2% 258885. 8 -5. 0

201332. 0

201765. 1 I /2 258890. 8

2/2

3/2 202367. 6 Cl iv ( 3 P0) Limit 321936

November 1947. Cl hi Observed Terms*

Config.

Is2 2s2 2p«+ Observed Terms

3s2 3p3 J3p3 4 S°

1 3p3

P° 3p3 2 D°

3s 3p4 3p4 4 P

ns (n>4) np (n> 4) nd (n >; 3)

3s2 3p2

(

3 P)nx / 4, 5s 4 P

l 4s 2 P

4p 4 S° 4p

4 P° 4p

4 D°

4p

2 P° 4p2 D°

3, 4d 4 P

3d 2 P

3, 4d 4 D

3, 4d 2 D

3, 4d 4 F

4d 2 F

3s2 3p2

(

x D)nx' 4, 5s' 2 D 4p' 2 po 4p / 2 Do 4p/ 2 F

° 3d' 2 P 3, 4d' 2 D 3, 4d' 2 F

*For predicted terms in the spectra of the P i isoelectronic sequence, see Introduction.
(Si i sequence; 14 electrons) Z—Yl

Ground state Is2 2s2 2p

6 3s2 Sp2 3Po

3p

2 3P0 431226 cm-1

I. P. 53.5 volts

The analysis is by Bowen, who has classified 84 lines in the range between 318 A and

3167 A. The singlet and triplet terms are connected by intersystem combinations. Bowen

classifies three fines (437 A-440 A) as 3p

3 6S°—4s 5P, but lists no quintet terms.

REFERENCES

I. S. Bowen, Phys. Rev. 31, 36 (1928). (C L)

S. C. Deb, Acad. Sci. Allahabad Bui. 3, 49 (1932). (I P) (T) (C L)

I. S. Bowen, Phys. Rev. 45, 401 (1934). (I P) (T) (C L)

I. S. Bowen, Phys. Rev. 46, 377 (1934). (T) (C L)

Cl IV Cl iv

Config. Desig. J Level Interval Config. Desig. J Level Interval

3s2 dp2 dp2 3 P 0 0

491

850

3s2 3p(2 P°)4s 4s 3 P° 0 215026. 0

363. 3

1078. 8

12 491

1341

12 215389. 3

216468. 1

3s2 3p

2 dp2 !D 2 13766 3s2 3p(2 P°)4s 4s iP° 1 219454

3s2 3p2 dp2 »S 0 32550 3s2 3p(2 P°)4p 4p

3 D 1 247575. 1?

451. 0

935. 1 2 248026. 1 3s 3p

3 3p3 3 D° 1 102752 35

82

3 248961. 2

2 1027S7

3 102869 3s2 3p(2 P°)4p 4p

3 P 0 251471. 4

254. 4

670. 9

1 251725. 8

3s dp3 3p

3 3po 2 120256 -18

-26

2 252396. 7

1 120274

0 120800 3s2 3p(2 P°)5s 5s 3 P° 0 312747 244

1234

3s 3p

3 3p3

S° 1 164721

12 312991

314225

3s 3p

3 dp3 1 P° 1 16674-2 3s2 3p(2 P°)5s 5s 1 815121

3s2 3p(2 P°)3d 3d

3 P° 2 181643

182073 -430

-227 10 182300 Cl v ( 2 P£) Limit 431226

3s2 3p(2 P°)3d 3d 3 D° 1 187008 166

172 2 187174

3 187346

October 1947.
Cl iv Observed Terms*

Config.

Is2 2s2 2p6 + Observed Terms

3s2 3p2 {dp2 X S

3p2 3 P

3

p

2 3 D

3s 3

p

3 |3p

3 3 S° 3p3 spo 3p3 iP° 3p3 3 D°

ns (n> 4) np (n> 4) nd (n> 3)

3s2 3p(2 P°)n# / 4, 5s 3 P°

\ 4, 5s iP°

4p 3 P 4p 3 D 3d 3P° 3d *D°

*For predicted terms in the spectra of the Si i isoelectronic sequence, see Introduction.

Cl V

(A1 i sequence; 13 electrons) Z—Yl

Ground state Is2 2s2 2p6 3s2 3y

2Py2

3p

2Pi°/2 547000 cm-1

I. P. 67.80 volts

The analysis is by Bowen except for the revision of 3d

4P° and the addition of 5d 2D suggested by Phillips1 and Parker. Forty-two lines have been classified in the interval between

236 A and 894 A.

No intersystem combinations connecting the doublet and quartet systems of terms have

been observed, as indicated by x in the table.

REFERENCES

I. S. Bowen, Phys. Rev. 31, 37 (1928). (C L)

S. C. Deb, Acad. Sci. Allahabad Bull. 2, 43 (1932). (T) (C L)

I. S. Bowen, Phys. Rev. 45, 401 (1934). (I P) (T) (C L)

L. W. Phillips and W. L. Parker, Phys. Rev. 60, 306 (1941). (T) (C L)
203

Civ Civ

Config. Desig. J Level

1 Interval Config. Desig. J Level Interval

3s2 0S)3p 3p aP° 0

1492 3s 3p(3 P°)3d 3d 4 P° 2/ 269986 +x -437

-322 1498 1/2 270483 +x

z 270745+x

3s 3pa 3p2 4 P X 86000+a; 538

843 1/2 86538 +x 3s 3p(3 P°)3d 3d 4 D° / 272596 +x 161 162

101 2/ 87381+x 1/2 272757+x

2/2 272919 +x

3s 3p2 3

p

2 2 D 1/2 113234 72 3/2 278020 +x

2/ 113306

/ 1/

3s 3p2 3p \ 2/ 2 2 S 3* 146644 3s2

(

1 S) 4d 4d 2 D

}

349511

3s 3p(3 P°)4s 4s 4 P° / 858445+x

533

947 3s 3pa 3p2 2 P H 157931 961 1/ 853978 +x

1/2 158892 2/ 854925 +x

3sa

(

1S)3d 3d 2 D 1/2 185861 32 3s2

(

1S)5d 5d 2 D 1/2 422949

73 2/ 185893 2/ 423022

3p

3

3s2

(

1 S)4s

3p3 4 S°

4s 2S

1/2/

288757 +x

256313 Cl vi OSo) Limit 547000

September 1947.

Cl v Observed Terms*

Config.

Is2 2s2 2p 8 +

Observed Terms

3s2

(

1 S)3p 3p 2P°

3s 3pa {3p2 2 S 3p2 4 P

3p2 2 P 3pa 2D

3p3 3p3 4 S°

ns (n> 4) nd (n> 3)

3s2

(

1 S)nx 4s 2 S 3-5d 2 D

3s 3p(3P°)nx 4s 4P° 3d 4P° 3d 4 D°

For predicted terms in the spectra of the A1 i isoelectronic sequence, see Introduction.
204

Cl VI

(Mg i sequence; 12 electrons) Z=17

Ground state Is2 2s2 2p

6 3s2 'S0

3s2 'So 780000 ± cm"1 I. P. 96.7 ± volts

The analysis is incomplete. One singlet combination has been given by Bowen and

Millikan, a line at 671.37 A classified as 3s2 'So —Sp 'P°. The triplet terms are from Phillips

and Parker, who have classified 34 lines in the range 194 A to 736 A.

From isoelectronic sequence data the writer has estimated the approximate value of the

limit, and of 3p

3Pi above the ground state zero. All triplet terms have, consequently, been

increased by 98147 cm-1

. The estimated values are entered in brackets in the table. The

uncertainty, x, may be several hundred cm

-

'. REFERENCES

I. S. Bowen and R. A. Millikan, Phys. Rev. 25, 597 (1925). (C L)

W. L. Parker and L. W. Phillips, Phys. Rev. 57, 140 (1940). (T) (C L)

L. W. Phillips and W. L. Parker, Phys. Rev. 60, 306 (1941). (T) (C L)

Cl VI Cl vi

Config. Desig. J Level Interval Config. Desig. J Level Interval

3s2 3s 2 iS 0 0 3p(2 P°)3d 3d 3 D° 1 411802 +x

2 412075 +z 153

3s(2 S) 3p 3v

3 P° 0 [98147] +x 553

1165

3 412228

1 98700 +z

2 99865 +z 3s(2S)4d 4d *D 1 509868 +x 28

51 2 509896 +z

3s(2 S)3p 3p ip° 1 148949 3 509947 +x

3p

2 3p2 3 P 0 234960 +x 636

1201

3s(2 S)4/ 4/ 3 F° 2, 3,4 529889 +x

1 235596 +x

2 236797 +x 3s(2S)5d 5d 3 D 12 612058 +x 31

3s (

2 S) 3d 3d 3 D 1? 279845 +x

279860 +x 1528

3 612089 +x

3 279888 +z

407404 +x

409079 +x

3s(2 S)4s

3p(2 P°)3d

4s 3 S 1 Cl vii (

2Sh) Limit [780000

]

3d 3 P° 2 -896

-787 1 409975 +x

0 410762 +x

July 1947.
205

Cl vi Observed Terms*

Config.

Is 2 2s2 2p 9 +

Observed Terms

3s2

3s(2S) 3p

3p

2

3s2 iS

/ 3p

3 P°

\ 3v

J P°

3p2 3 P

ns (n> 4) nd (n> 3) nf (n > 4)

3s(2 S)nz 4s 3 S 3-5d 3 D 4/ *F° 3p(2 P

0)tt£ 3d 3 P° 3d 3 D°

*For predicted terms in the spectra of the Mg i isoelectronic sequence, see Introduction.

Cl vii

(Na i sequence; 11 electrons) Z=17

Ground state Is2 2s2 2p6 3s 2S«

3s 2Sh 921902 cm"1 I. P. 114.27 volts

The resonance lines were observed by Bowen and Millikan. The analysis was extended

by Phillips to include 22 classified lines in the interval between 174 A and 813 A. Absolute

term values were derived from the 3d-nj series. REFERENCES

I. S. Bowen and R. A. Millikan, Phys. Rev. 25, 295 (1925). (C L)

L. W. Phillips, Phys. Rev. 53, 248 (1938). (I P) (T) (C L)

Cl vii Cl vii

Config. Desig. J Level Interval Config. Desig. J Level Interval

3s 3s 2 S Vi 0 4/ 4/ 2F° 2}'2 684086 13 3H 584099

3p 3p

2 P° y 123001 1890

1/2 124891 5s 5s 2S X 647677

3d 3d 2 D 1/2 290166

73 5d 5d 2 D 1/2 697598 21 2H 290239 2y2 697619

4s 4s 2S H 464003 5/ 5/ 2F° 2y2 705398 11 3H 705409

4p 4p 2 P° 509197 688

f 2K

\ 3H

1/2 509885

6/ 6/ 2 F°

}

771549

4d 4d 2 D 1H

2/2 569142

569182 40

Cl viii OSo) Limit 921902

June 1947.
206

Cl vin

(Ne i sequence; 10 electrons) Z=17

Ground state Is2 2s2 2pQ 'S0

2

p

6 % 2810000 ±500 cm"1 I. P. 348.3±0.1 volts

Edlen has classified 13 lines in the region between 39A and 59A, as combinations with the

ground term. The terms from the (2S) limit in Cl ix need further confirmation.

As for Ne i the ^-coupling notation in the general form suggested by Racah is introduced.

The unit 103 cm-1 used by Edlen has here been converted to cm-1

. REFERENCES

B. EdlSn, Zeit. Phys. 100, 726 (1936). (I P) (T) (C L) G. Racah, Phys. Rev. 61, 537 (L) (1942).

Cl yiii

Edl6n Config. Desig. J Level

2p xSo 2s2 2p6 2 iS 0 0

2s2 2p5 (

2 Pf*)3s 3s [1K1° 2

CO CO eC 1 1689450

2s2 2p 5 (

2 P£)3s 3s' [ %]° 0

3s !Pi 1 1704860

2s2 2p 5 (

2 Pf*)3d 3d [ y2 ]° 0 3d 3Pi 1 1972890

3d iPj // 3d [i y2]° 1 1997040

3d 3 Dj 2s2 2p5

(

2 P£)3d 3d'[l/2]° 1 2020730

2s2 2p5

( 2 Pfo)4s 4s [1341° 2

4s 3 Pi 1 2242000

2s2 2p5

(

2 P£)4s 4s' [ y2}° 0

4s Ti 1 2254200

Cl yiii

Edl6n Config. Desig. J Level

4d 2s 2 2p 5 (

2 Pfo)4d 4d [1341° 1 2856820

4d 3 Dj 2s 2 2p5

(

2 P£)4

4d'[134]° 1 2868550

3p' 3 Pi

2s 2p6

(

2 S) 3p 3v

3 P° 2

10

23715807

3p' 'Pi 2s 2p 6

( 2 S) 3p 3p 1 24017707

5d iPi 2s2 2p5

(

2 P^)5d 5d [l/2]° 1 2521750

5d 3 Dj 2s2 2p 5 (

2 P£)5d 5d'[iy2]° 1 2584080

Cl ix ( 2 P?*)

Cl ix (

2 P£)

Limit 2810000

Limit 2823600

April 1947.
Cl viii Obsekved Levels*

Config.

ls 2 +

Observed Terms

2s2 2

p

6 2

pe iS

ns (n> 3) np (n> 3) nd (n> 3)

2s2 2p5

(

2 P°)nx / 3, 4s 3 P°

\ 3, 4s ip° 3d 3 P° 3-5d *D°

3-5d X P°

2s 2p6

( 2 S)nx

{

o

o a

a,

COCO

yZ-Coupling Notation

Observed Pairs

ns (n> 3) nd (n> 3)

2s2 2p6

(

2 Pfo)nz 3,4s [1 y2]° 3d [ y2]° 3-5d [V/2] 0

2s 2 2p5

(

2 P£)m;/ 3, 4s' [ y2 ]° 3-5d' [1 y]°

*For predicted levels in the spectra of the Ne i isoelectronic sequence,

see Introduction.

Cl IX

(F i sequence; 9 electrons) Z= 17

Ground state Is2 2s2 2p5 2P^

2p6 2P°^ 3233000 cm-1

I. P. 400.7 volts

Edlen has classified 34 lines in this spectrum in the interval 42 A to 53 A. The absolute

value of the ground state has been extrapolated. Since no combinations between the two lowest

terms have been observed, relative values have been extrapolated from the irregular doublet

law for the three terms entered in brackets in the table. The uncertainty in the relative values

may be large.

Levels from the 3d configurations with limits 3P and XD in Cl x are labeled X since Edlen

has been unable to assign term designations to them.

The unit used by Edlen, 103 cm-1

, has here been converted to cm-1

. REFERENCE

B. Edl6n, Zeit. Phys. 100, 726 (1936). (I P) (T) (C L)
208

Cl IX Cl IX

Edl6n Config. Desig. J Level Interval Edl6n Config. Desig. J Level Interval

2p

2 P2

2 Pi

2s2 2

p

5 2p

5 2 po IX

y! 0

18600 -13600 3d X2 2s2 2p 4

(

3 P)3d 3d X2 2209470

3d Xx 2s2 2p 4

(

3 P)3d 3d Xx 2216710

2

p' 2 Sx 2s 2p

6 2p6 2 S X [553400]

3d X5 2s 3d' X5 2259280 2 2p4

(

x D)3d

3s 4 P3 2s 2 2p 4

( 3 P)3s 3s 4P 2/2 1888970 -7630

-5250

4 P2 1896600 3d X4 2s2 2p 4 (

x D)3d 3d' X4 2263310

4Pi 1901850

3d X2)3 2s 2 2p4

(

x D)3d 3d' X2>3 2268000

3s 2 P2 2s 2 2p 4 (

3 P) 3s 3s 2P 1/4 1911950

2 -9100

Pi X 1921050 3d Xx 2s2 2p4

(

x D)3d 3d' Xx 2272570

3s 2 D3 2s 2 2p4 (

1 D)3s 3s' 2D 2y2 1959790 -170 Wd 2 D3 2s2 2p4 (

x S) 3d 3d" 2 D 2y2 2328830

2 -1300 D2 1/2 1959960 2 D2 1 X 2330130

Is 2 Sj 2s2 2p4

(

x S)3s 3s" 2 S 2031080 3s' 2 P2 2s 2p5

( 3 P°)3s 3s'" 2 P° IX [2415740]

2 -8640

Pi x [2424880]

3d X6 2s2 2p4

(

3 P)3d 3d X6 2196890

3d' 2 Px 2s 2p5

(

3 P°)3d 3d'" 2 P° X

1/2 [2715940] 6750 3d X5 2s2 2p 4

(

3 P)3d 3d x5 2199540 2P2 [2722690]

3d X4 2s2 2p 4 ( 3 P)3d

2s2 2p 4

( 3P)3d

3d x4 2203850

3d X3 3d x3 2205950 Cl x ( 3 P2) Limit [3233000]

March 1947,

Cl ix Observed Terms*

Config.

ls2 +

Observed Terms

2s2 2

p

5 2

p

5 2P°

2s 2p6 2p« 2 S

ns ( n> 3) nd (n> 3)

2s2 2pi (

3P)nx

{

3s 4 P

3s 2P

2s2 2p4 (

x D)no;' 3s' 2D

2s2 2p4 (

x S)nx" 3s" 2S 3d" 2D

2s 2p5 (

3 P°)nx"' 3s'" 2P° 3d'" 2P°

*For predicted terms in the spectra of the F i isoelectronic sequence,

see Introduction.
209

Cl X

(0 i sequence; 8 electrons) Z=17

Ground state Is2 2s2 2pA 3P2

2pA 3P2 3673000 cm'1 I. P. 455.3 volts

Edlen has classified 15 lines between 39 A and 47 A. The absolute value of the ground

term has been extrapolated from the isoelectronic sequence. Similarly, the singlet and triplet

terms are connected only through the extrapolated value of 2p

A 3P2 —

p

A X D2 , and the uncertainty, x, may be large. The estimated value of 2p

5 3P2 is given in brackets.

Edlen’s term values expressed in units of 103 cm-1 are here changed to cm-1

. REFERENCE

B. Edl&n, Zeit, Phys. 100, 732 (1936). (I P) (T) (C L).

Cl X Cl X

Edl<§n Config. Desig. J Level Interval Edlen Config. Desig. J Level Interval

2p 3 P2

3 Pi

2s 2 2pi 2p

i 3 P 2

1 0 10880 - 10880 Is J Pi 2s2 2p3

(

2 P°)3s 3s" X P° 1 2262140 +x

0 2s 2 2p3 (

4 S°)3d 3d 3 D° 1 3d 3 E>2 2 2415360 680 2p iD 2s2 2p

i 2p

i X D 2 61000 +x 3 d3 3 241 6040

2p

iS 2s 2 2pi 2

p

4 X S 0 130310 +x 3

d

3 D 2s2 2p3 (

2 D°)3d 3d' 3 D° 3, 2,1 2494700

2p' 3 P 2s 2p5 2p5 3 P° 2

1 [487000] 3

d

X D2 2s2 2p3

(

2 D°)3d 3d' >D° 2 2500880 +x

0 3d

3 P 2s2 2p3

(

2 D°)3d 3d' 3 P° 2, 1,0 2502750

3s *S, 2s2 2p3 (

4 S°)3s 3s 3 S° 1 2184700 3

d

1 F3 2s2 2p3

( 2 D°)3d 3d' X F° 3 2520420 +x

3s 3 D 2s 2 2p3

( 2 D°)3s 3s' 3 D° 3, 2,1 2202610 M 3 D 2s2 2p3

(

2 P°)3d 3d" 3 D° 3, 2,1 2547580

iD 2s 2 2p3

(

2 D°)3s 3s' >D° 2 2212650 +x

Cl xi (

4 Sfo) Limit 3673000

March 1947.

Cl x Observed Terms*

Config.

ls 2 +

Observed Terms

2s2 2p

i {2

p

4 X S

2pi 3 P

2p4 X D

ns (n > 3) nd (n>3)

2s 2 2p3

(

4S°)nx 3s 3 S° 3d 3 D°

2s2 2p3

(

2 D°)nx'

{

O Q0O

COCO O 'b CO 3d' 3 D°

3d' >D° 3d' X F°

2s2 2p3

( 2 P°)nx"

{ 3s" X P°

3d" 3 D°

*For predicted terms in the spectra of the Oi isoelectronic sequence, see Introduction.
210

Cl xi

(N i sequence; 7 electrons) Z=17

Ground state Is2 2s2 2p

3 4S°^

2p

3 4S°^ cm-1

I. P. volts

This spectrum has not been analyzed, but Edlen has classified two lines as due to Clxi:

A Int. Wave No. Desig.

40. 787 0 2451760 2p3 2 D° _ 3s ' 2D

40. 392 0 2475740 2p

3 4 S?H -3s

By extrapolation along the isoelectronic sequence, he lists combinations giving the relative

positions of two other levels (entered in brackets in the table). From these data preliminary

term values have been calculated and entered below. The uncertainty x is probably large.

The unit used by Edlen, 103 cm-1

, has here been changed to cm-1

. REFERENCE

B. Edl6n, Zeit. Phys. 100, 728 (1936). (C L)

Cl XI

Edl6n Config. Desig. J Level

2p <S2 2s2 2p

3 2p3 4S° i X 0

2s2 2p3 2p

3 2 D° 1/2 2p

2D3 2/ [94000]+x

2s2 2p3 2p3 2 P° X

2p 2Pa 1 X [148000]+x

2s2 2p2

( 3P)3s 3s 4P x

i x

3s *P3 2/ 2475740

3s 2D 2s2 2p2

(

1 D) 3s 3s' 2D {

l X

l 2/2 }2545760?+x

February 1947.
ARGON

18 electrons Z= 18

Ground state Is2 2s2 2p

6 3s2 3p*

3p

6 XS0 127109.9 cm"1 I. P. 15.755 volts

The present list has been compiled from an unpublished manuscript kindly furnished by

Edlen, who has made a study of this spectrum and interpreted it with the aid of present

atomic theory. His term array is based on those published by Humphreys (1938) and by

Meggers and Humphreys (1933), although he has revised and extended their lists. Three

place entries are from interferometer measurements. The values of 4/[4%], 4/ [334], and

4/' [3)4] are from unpublished data by Humphreys based on observations by Sittner.

The terms ns'[)Q 0 (?i=ll to 16) and nd'[1)4]° (n=9 to 14) have been calculated by the

writer from the absorption series observed by Beutler in the region between 871 and 876 A,

and added to Edlen’s list. Beutler lists these terms as blended.

Edlen has determined the new values of the series limits quoted here.

The Paschen notation used by Meissner, Rasmussen, Meggers, Humphreys, and others

is entered in column one of the table in the same form as for Ne i. The letters U, V, W, X,

Y, Z, adopted when configurations involving / electrons were found, are also entered in this

column. Twenty-seven of these levels have J-values fixed by the observed combinations.

These J-values are given in italics in the table.

Edlen suggested that a pair-coupling notation be adopted for Ne-like spectra to take into

account the departure from A*Sr-coupling. According to Shortley, Z^-designations can be

significantly assigned in only a few cases, in particular, for the following groups of levels:

Paschen Desig. Paschen Desig. Paschen Desig. Paschen Desig. Paschen Desig.

(71-3) s5 ns *P2 2pio 4p *Si 2p5 4p 3 P0 4^8 4d 3 Po 4d’i 4d m

(n-3)s4 ns 3 Pj 2p9 4p

3D3 2p4 4p J Pi 4d5 4d 3 Pf 4d[ 4:d !F|

(»-3)*8 ns «P5 2p8 4p

3D2 2P3 4p 3 P2 4d'i 4d *F| 4sT 4d IDS

(n-3)s2 ns xPi 2p: 4p 3 Di 2p2 4p 3 PX 4

d

4 4d 8 F| 4s7 4d 8 D§

2p« 4p xD2 2pi 4p xSo 4^3 4d 3 PI 4*7 4d 8 D2

4^2 4d iP| 4s; 4d 8 Di

Consequently, the jZ-coupling notation in the general form suggested by Racah is here introduced. The present arrangement has been suggested by Shortley, who has made a detailed

investigation of the theoretical arrangement of the “pairs”, to be used as a guide in preparing

the present table. The pairs nd [3$° and nd[lK]° are partially inverted as compared with

Nei.

No Grotrian diagram appears to have been published for this spectrum.
212

A I—Continued

REFERENCES

K. W. Meissner, Zeit. Phys. 39, 172 (1926); 40, 839 (1927). (I P) (T) (C L)

E. Rasmussen, Serier i de Aedle Luftarters Spektre med Saerligt Henblik paa Radiumemanation p. 22 (Danske

Ervhervs Annoncebureau’s Forlag, Kobenhavn, 1932) Dissertation, Copenhagen. (T) (C L)

E. Rasmussen, Zeit. Phys. 75, 695 (1932). (T) (C L)

W. F. Meggers and C. J. Humphreys, Bur. Std. J. Research 10, 437, RP540 (1933). (T) (C L) R. M. Woods and B. J. Spence, Phys. Rev. 45, 669 (1934). (C L)

J. C. Boyce, Phys. Rev. 48, 396 (1935). (I P) (T) (C L)

H. Beutler, Zeit. Phys. 93, 177 (1935). (I P) (T) (C L) H. Kopfermann und H. Kruger, Zeit. Phys. 105, 389 (1937). (I S)

J. B. Green, Phys. Rev. 52, 736 (1937). (Z E)

J. B. Green and B. Fried, Phys. Rev. 54, 876 (1938). (Z E)

P. Jacquinot, Compt. Rend. 206, 1635 (1938). (Z E)

C. J. Humphreys, J. Research Nat. Bur. Std. 20, 26, RP1061 (1938) and unpublished data. (T) (C L) G. Racah, Phys. Rev. 61, 537 (L) (1942). B. Edlen, Ark. Mat. Astr. Fys. (Stockholm) 29A, No. 32 (1943). (C L)

J. B. Green, Phys. Rev. 64, 151 (1943). (Z E)

G. Shortley, unpublished material (Aug. 1947). B. Edl6n, unpublished material (April 1948). (I P) (T) (C L)

W. R. Sittner, unpublished material (1949).

Al Al

Authors

Config. Desig. J Level Obs. g Authors Config. Desig. J Level Obs. g

lpo 3p6 3p61 S 0 0.0 3pio 3p5 (

2 RlH)5p 5P [ 34] 1 116660. 054 1. 90

4S [i y2]° 3p9 ft 5p [234] 3 116942. 815

ls6 3p5(2 Pi*)4s 2 98143. 800 1. 506 3p8 2 116999. 389 1. 09

ls4 1 98750. 689 1. 404

3pi

ft 5P [134] 1 117151. 387 1. 01

lS3 3p5

( 2 P£)4s 4s' [ y2]° 0 94553. 707 3p& 2 117183. 654 1. 42

lS2 1 95399. 870 1. 102

3ps ft 5p [ Vi] 0 117563. 020

2pio 3p5CPf*)4p 4p [ 34] 1 104102. 144 1. 985 3p4 3pK2 PA)5p V [134] 1 118407. 494 0. 61 3ps 2 118469. 117 1. 18

2pt ft Ip [234] 3 105462. 804 1. 338

2ps 2 105617. 315 1. 112 3p2 ft 5p' [ 34] 1 118459. 662 1. 45

3pi 0 118870. 981

2Pi

ft 4p [134] 1 106087. 305 0. 838

2pa 2 106237. 597 1. 305

4de 3p5(2Pi«)4d 4d [ 34]° 0 118512. 17

2Pa

tt 4p [ 34] 0 107054. 319 4d5 1 118651. 447 1. 467

2??4 3p 5 (

2 P£)4p 4p' [134] 1 107131. 755 0. 819 4di

tt 4d [334]° 4 119023. 699 1. 255

2p3 2 107289. 747 1. 260 4d4 3 119212. 93 1. 077

2p2 tt iv' i w. 1 107496. 463 1. 380 4d3 n 4d [ 134]

0 2 118906. 665 1. 437

2pi 0 108722. 668 4d2 1 119847. 81 0. 768

4d" tt 4d [234]° 2 119444- 88 0. 908

3d9 3p5(2 Pi*)3d 3d [ >4]° 0 111667. 87 4d] 3 119566. 11 3da 1 111818. 09

4s"" 3p5

(

2 P£)4d 4d' [234]° 2 120619. 076 0. 987

3&

tt 3d [334]° 4 112750. 22 4si" 3 120753. 52 1. 133

3d4 3 113020. 39

4s" ft 4d' [134]° 2 120600. 944 1. 057

3d3 tt 3d [134]° 2 112188. 98 4s[ 1 121011. 979 0. 877

3d% 1 114147. 75 3d" tt 3d [234]° 2 113486. 05 3s5 3p5

(

2 P?^) 6s 6s [134]° 2 119688. 113 1. 500

3d[ 3 113716. 61 3s4 1 119760. 22 1. 184

3s"” 3p5

(

2 PA)3d 3d' [234]° 2 114641 04 3s3 3p5 (2 PA)6s 6s' [ 34]° 0 121096. 67

3s'" 3 114821. 99 3s2 1 121161. 356 1. 271

3s" ft 3d' [134]° 2 114805. 18

3s[ 1 115366. 90 4X 3PH

2 P!h)4/ 4f [1Y] 1 120188. 34

4X 2 120188. 66

2S5 3p5

(

2 Pfo) 5s 5s [134]° 2 118468. 55 4V tt 4f [434] 5 120207. 32

2s4 1 118648. 26

4Y

4 120207. 77

2s3 3p5

(

2 P£)5s 5s'

[ 34]° 0 114861. 67 4Y 11 4f [234] 3 120229. 81

2s2 1 114975. 07 2 120230. 07
A I—Continued A I—Continued

213

Authors

Config. Desig. / Level Obs. g Authors Config. Desig. Level Obs. g

4U 3p5

(

2 P!k)4/ 4/ [3)4] 3,4 120250. 15 5p2 3p5

(

2 Pn)7p 7p' [ y2] 1 124651. 05

5pi 0 124749. 89

4W 3p5

(

2 P£>4/ 4/' [3)4] 3, 4 121653. 40 4Z tt 4/' [2)4] 3 121654. 32 6d6 3pH2 Pl«)6d 6d [ y2 y 0 123508. 96

4Z 2 121654. 58 6d5 1 123468. 034 1. 233

6c?4

tt 6d [3y2]° 4 123653. 238 1. 256

4pio 3p5(2Pi*)6p 6p [ )4] 1 121068. 804 6d4 3 123773. 920 1. 052

4p9 tt 6p [2)4] 3 121165. 431 6d3 tt 6d [1 y2 ]° 2 123808. 60 1. 206

4p8 2 121191. 92 1 4p7 ft 6p [1)4] 1 121257. 227 6d" ft 6d [2)4]° 2 123826. 85 1. 107

4p6 2 121270. 682 6d[ 3 123832. 50 1. 245

4p6 tt 6p [ )4] 0 121470. 304 n //// OSi 3p5 (

2 PA)6d 6d' [2y2]° 2 125113. 48 0. 777

6s"' 3 125150. 00 1. 098

4p4 3p*(2 P£)6p 6p' [1)4] 1 122609. 76

4p3 2 122635. 128 6s" tt 6d' [iy2 ]° 2 125066. 501 1. 264

6s[ 1 125286. 28

4p2 tt 6p' [ )4] 1 122601. 290

4pi 0 122790. 612

5$5 3p5

( 2 P!^)8s 8s [iy2 ]° 2 123903. 295 1. 50

3p5(2p iH)5d 5d [ )4]° 5s4 1 123935. 97

5d6 0 121794- 158

5d5 1 121932. 908 1. 400 5s3 3p5

(

2 P£) 8s 8s'

[ y2 ]° 0 125334- 75 5d [3)4]° 5s2 1 125353. 31 1. 26

5di

tt 4 122036. 134 1. 253

5di 5d3 //

3 122160. 22

122086. 974

1. 076

1. 387

6X 3p*(2 Pi*)6/ 6/ [1)4] 1 124041. 20

5d [1)4]° 2 6X 2 124041. 38

5d2 5d [2)4]°

1 122614- 29 0. 813

tt 6V 6/ [4)4] 4, 5 124046. 64

5d" 2 122282. 134 0. 941

5d[

3p5

( 2 P£)5d

3 122329. 72 1. 199 6Y

6Y

ft 6/ [2)4] S

2

124051. 44

124051. 65

5s^ 5d' [2)4]° 2 123505. 536 0. 802

5s"' 3 123557. 459 1. 127 6U tt 6/ [3)4] 3, 4c 124058. 36

5sJ

5s[

tt 5d' [1)4]° 2

1 123372. 987

123815. 53

1. 265

0. 846

6W 3pK2 PA)6/ 6/' [3)4] 3, 4 125482. 70

6Z tt 6/' [2)4] 3 125483. 16

4s5 3p5

( 2 P!^)7s 7s [1)4]° 2 122440. 109 1. 506 6Z 2 125483. 34

4s4 1 122479. 459 1. 164

4s3 3p5

(

2 P£)7s 7s' [ )4]° 0 123873. 07 6pio 3p5(

2 P!*)8p 8p [ )4] 1 124311. 72

4s2 1 123882. 30 1. 296

6ps tt 8p [2)4] 3 124349. 04

6p8 2 124356. 73

5X 3p5 (

2P!h)5/ 5/ [1)4] 1 122686. 20

5X 2 122686. 40 6p7 8p [1)4] 1 124376. 38

6p6 2 124381. 01 5V ft 5/ [4)4] 4,5 122695. 70

6p5 ft 8p [ y2 ] 0 124439. 41 5Y ft 5/ [2)4] S 122707. 94

3pH2 5Y PA)8p 8p' [1)4] 125783. 8 2 122708. 18 6p4 1 6p3 2 125791. 94

5U tt 5/ [3)4] 3, 4 122717. 90

6P2 tt 8p' [ )4] 1 125777. 3 5W 3p

«( 2 Ph)5/ 5/' [3)4] S, 4 124135. 74 6pi 0 125831. 45

5Z ft 5/' [2)4] 3 124137. 29

3pH2 5Z P!m)7d 7rf [ )4]° 124526. 75 2 124137. 45 7d6 0

7d5 1 124554. 939

5pio 3p5

(

2 Pf*)7p 7p [ )4] 1 123172. 09 7d\ tt 7d [3)4]° 4 124609. 917

5pa

7di 3 124649- 549

tt 7p [2)4] 3 123205. 83

5p8 2 123220. 73 7d3 tt 7d [1)4]° 2 124603. 957

7d2 1 124788. 39

5p7 ft 7p [1)4] 1 123254. 99

5p« 2 123261. 593 7d" ft 7d [2)4]° 2 124692. 02

7d[ 3 124715. 16

5p4

ft

3p5

(

2 P«)7p

7p [ J4] 0 123385. 13

7s"" 3p5

(

2 P&) 7d 7d' [2)4]° 2 126064. 50

7p' [1)4] 1 124643. 54 7s'" 3 126089. 56

5ps 2 124658. 52
214

A I—Continued A I—Continued

Authors

Config. Desig. j Level Obs. g Authors Config. Desig. </ Level Obs. g

7s i 3p6 (

2 P&)7d 7d' [1^]° 2 126053. 21 9d'i 3p5

(2Pin)9d 9d [3K]° 4 125631. 69

1 9d4 3 125652. 04

9d3 if 9d [1 y2]° 2 125637. 93

6s5 3p5

( 2 P!H)9s 9s [1J4]° 2 124771. 67 9d2 1 125718. 12

6s4 1 124782. 77

9d" if 9d [2K]° 2 125671. 53

6s3 3p5

( 2 P£)9s 9s' [ y2]° 0 126202. 82 9d[ 3 125680. 52

6s2 1 126211. 57

9s] 3p5

(

2 PA)9d' CO a- toX O 2

1 127130

7X 3p5( 2 Pi*)7/ 7

[IK] 7 124857. 27

7X 2 124857. 42

8s5 3p 5

( 2 Pl^)lls 11s [1K]° 2 125709. 45

7V tt 7/ [4K] 4,5 124860. 64 8s4 1 125715. 50

7Y tt 7/ [2J4] 3 124865. 04 3p5

(

2 P^)lls 11s' [ y2]° 0 7Y « 124865. 19 8s2 1 127130

7U tt 7/ [3M] 5, 4 124868. 77

9X 3pK2 PIh)9/ 9/ [IK] 1,2 125748. 9 7W 3p5

( 2 P£)7/ 7/' [334] 3,4 126294. 90

9V n

9/ [4K] 4,5 125750. 39

7Z ft 7/' [234] 3 126295. 02

2 9Y tt 9/ [2K] 3

2 125752. 8

7pio 3p5

( 2 Pin)9p 9p [ K1 1 125039. 60 9U n

9/ [3K] 3,4 125754. 21

7p9 n

9p [234] 3 125054. 1 7Vi 2 125059. 8 9pio 3p5

(

2 Pi^)llp lip [ K] 1 125844. 3

7Vi

tt 9p [IK] 1 125072. 6 9p7 n lip [1K1 1 125853. 3

7pa 2 125074. 9 9p6 2 125853. 8 7pfi tt 9p [ K] 0 125122. 54 9p5 ft lip [ K] 0 125888. 9

7Pi 3pK2 P£)9p 9p' [ K] 10 126524. 2 10d6 3p s

( 2 PiH)10d lOd [ K]° 0 125895. 72

10d5 1 125898. 64

00

00 3pK2 Pi*)8d 8d [ y2]° 0

1 125163. 00125135. 898 10^4 10d4

ft 10d [3K]° 4

3 125922. 53

125932. 59

00

00 tt 8d [sy2 ]° 4

3 125219. 88

125269. 52 10d3 tt iod [1K]° 2

1 125906. 61

8d3 tt 00 Nr*to^- O 2

1 125282. 97 10d" /f 10d [2K]° 2 125945. 72

10d[ 3 125957. 40

8d'i

tt 8d [2y2]° 2 125291. 45

3p 5

( 8d[ 3 125293. 65

2P&)10d 10d' [1K]°

lOs'i 2

1 127410

7s5 3p5

(

2 Pij^)10s 10s [134]° 2 125329. 99

7s4 1 125331. 93 9s6 3p 12s [1K]° 5 (

2 Pfi^)12s 2 125979. 41

9s4 1 125984. 35

8X 3PY

2 P!h)8/ 8/ \m 1,2 125386. 41 3p 5

( 2 P^)12s 12s' [ K]° 0 8Y tt 8/ [4343 4,5 125388. 65 9s2 1 127410

8Y

8Y

8/ [234] 3

2

125391. 04

125391. 17 lOpio 3p5

(

2Pfi^)12p 12p [ K] 1 126072. 6 10p5 0 126101. 7 8U tt 8/ [334] 3, 4 125393. 79

3p5(2p iH)l0p lOp [ K] 1 125505. 5

113s 3pK2P?H)Hd Hd [ K]° 0 126114- 66

00 o lids 1 126099. 49

8p9

tt lOp [ 234] 3 125519. 9 lid* ft lid [3K]° 4 126135. 42

2 lld4 3 126154- 55

8pi 8Pi

tt lOp [IK] 12 125531. 5 125533. 8 lld3 ft lid [1K]° 2

1 126159. 9

%Pb n lOp [ K1 0 125561. 9

11 d" tt lid [2K]° 2 126162. 5

11d[ 3 126163. 24

9de 3pK2 Pi*)9d 9d [ y2]° 0 125596. 11

9di 1 125613. 12
A I—Continued A I—Continued

215

Authors

Config. Desig. J Level Obs. g Authors Config. Desig. J Level

3p5

(

2 P£)lld lid' [1 y2 ]° 2 13d3 3p3

(

2PiH)13d 13d [iy2 ]° 2 126420. 8

11 si 1 127610 1

10s6 3p®(2 P!*)13s i3s [iy2 ]° 2 126178. 27 1 3d i it 13d [2 y2 ]° 2 126432. 1 10s4 1 126181. 30 13d[ 3 126435. 5

3p5

( 2 P£)13s i3s' [ y2 ]° 0 3p5

( 2 P£)13d 13d' [l/2]° 2

10s2 1 127610 13s{ 1 127880

3p3

( 2 P?*)13p 13p [ y2 ] 1 lips 0 126270. 0 14d6 3pK2 Pw)14d I4d [ y2 ]° 0 126508. 1 14d5 1 126510. 06

12d6 3p3 (

2 Pfx)12d 12d [ y2 ]° 0 126281. 3 14di tt 14d [3/2 ]° 4 126517. 41 12d6 1 126292. 71 14d4 3 126521. 71

12d'i n 12d [3 y2 ]° 4 126295. 79 14d3 n I4d [iy2]° 2 126514. 8

12d4 3 126305. 28 1

12d3 3ps (

2P!*)13d 12d [i y2]° 2 126302. 6 n 14d [2 y2 ]° 2

1 Ud[ 3 126530. 1 12d’{

// 12d [2 y2 ]° 2 126313. 1 3p5

( 2 P£)14d I4d' [1 y2 ]° 2

12d[ 3 126316. 1 14sj 1 127970

3p 5

( 2 P£)12d 12d' [iy2 ]° 2

12sJ 1 127760 An (

2 Pf*) Limit 127109.9

lls5 3p3

( 2 Pi*)14s i4s [i y2 ]° 2 126328. 80

lls4 1 126332. 0 3p5

(

2 P£)15s i5s' [ y2y 0

12s2 1 127880

3p5

(

2 P£)14s i4s' [ y2]° 0

lls2 1 127760

3p5

(2 P^)16s i6s' [ y2]° 0 3p 3

(

2 P|*)13d 13d [ y2 y 0 13s2 1 127970

13dfi 1 126412. 99

13di

// 13d [3 y2 ]° 4 126419. 65 An (

2 P£) Limit 128541. 3

13d4 3 126426. 07

April 1948. A i Observed Levels*

Config.

Is2 2s2 2

p

6 3s2 +

Observed Terms

3p6 3pfl *S

ns (n> 4) np (n> 4) nd (n> 3)

3p5

(

2P°)nx / 4-1 6s 3 P°

\ 4-9, 11-1 6s iP0 4p

3 S

4p *S 4p

3 P

4p !P 4p 3 D

4p *D

o

£hPh o 4d 3 D°

4d

o

o

/Z-Coupling Notation

Observed Pairs

ns (n> 4) np (n> 4) nd (n> 3) nf (n> 4)

3p5 (

2P\x)nx 4r-14s [1 y2]° 4-i3p [ y2] 4—lOp [2 y2] 4—lip [i y2]

3-14d [ /2 ]° 3-14d [3/2]° 3-14d [1 y2]° 3-14d [2J/2]°

4-

9/ [iy2]

5-

9f [4 y2]

4-

9/ [2J4]

5-

9/ [3y2] 3p5

(2 P£)nx' 4-9, 11—16s'[ y2]° 4-8p'[lH]

4—9p' [ y2] 3- 7d'[2K]°3-7, 9-14d'[l%]°

4-7/' [3^4] 4-7/' [2/2 ]

*For predicted levels in the spectra of the A i isoelectronic sequence, see Introduction.
(Cl i sequence; 17 electrons) Z=18

Ground state Is2 2s2 2p

6 3

2 3p5 2P°

y

3

3pB 2P& 222820±300 cm"1 I. P. 27.62 volts

A monograph containing the complete and detailed analysis of this spectrum is needed.

Most of the analysis is by de Bruin, but his work has been revised and extended by a number

of investigators who are not in complete agreement on all details of interpretation.

The term list published by Boyce forms the basis of the present compilation, but the

later additions and revisions by Minnhagen, Edlen, and de Bruin have been incorporated into

the present list. The writer has prepared a complete multiplet array for this spectrum and

in dubious cases she has attempted to adopt the term assignments that appear to be best

confirmed from the multiplet evidence.

One term labeled

“ 2P” in the table, (“a 2P” in the published papers), has as yet no configuration assignment. Three miscellaneous levels assigned by de Bruin (1937) to the 4/

configuration have been omitted pending further confirmation.

The doublet and quartet terms are well connected by observed intersystem combinations.

Edlen has derived the series limit quoted here from the (

3P)ns 4P2P series (p,=4, 5, 6).

REFERENCES

T. L. de Bruin, Zeit. Phys. 51, 108 (1928); Proc. Roy. Acad. Amsterdam 31, No. 7, 771 (1928). (I P) (T)

(C L) T. L. de Bruin, Zeit. Phys. 61, 307 (1930); Proc. Roy. Acad. Amsterdam 33, No. 2, 198 (1930). (I P) (T)

(C L) A. H. Rosenthal, Ann. der Phys. [5] 4, 49 (1930). (T) (C L)

J. C. Boyce, Phys. Rev. 48, 397 (1935). (I P) (T) (C L) T. L. de Bruin, Proc. Roy. Acad. Amsterdam 40, No. 4, 340 (1937). (T) (C L) B. Edl6n, Zeit. Phys. 104, 413 (1937). (I P) (T) (C L) R. Bezier, Zeit. Phys. 116, 480 (1940). (Z E)

L. Minnhagen, Ark. Mat. Astr. Fys. (Stockholm) 34A, No. 22 p. 4 (1947). (T) (C L)

L. Minnhagen, Ark. Mat. Astr. Fys. (Stockholm) 35A, No. 16 p. 3 (1948). (E D)

A II A II

Config. Desig. J Level Interval Obs. g Config. Desig. J Level Interval Obs. g

3s2 3

p

5 3p5 2po w 0. 0 -1432. 0

3s2 3p4 (

4 D)4s 4s' 2 D iy2 148620. 98

222. 31 0. 803

y2 1482. 0 2y2 148843. 29 1. 202

3s 3

p

8 3p 6 2 S y2 108722. 5 3s2 3p4

(

3 P)3d 3d 2 JT 31/2 149180. 18 -968. 36 2% 150148. 54

3s2 3p4 (

3 P)3d 3d 4 D 3Y2 132328. 22 -153. 90

-149. 52

-106. 96

2y2 132482. 12 3s 2 3p4 (

3 P)3d 3d 2 D iy2 150475. 82

612. 36 iy2 y2 132631. 64

132738. 60

2y2 151088. 18

3s2 3p 4 (

3 P)4p 4p 4po 2y2 155044- 07 -307. 97

•-356. 98

1. 599

3s2 3p4 (

3 P)4s 4s 4 P 2y2 134242. 62 -844. 26

-515. 74

1. 598 1/2 155852. 04 1. 720

1 y2 y135086. 88

135602. 62

1. 722

2. 650

y2 155709. 02 2. 638

3s 2 3p4 ( 3 P)4p 4p 4 D° 3y2 157234- 98 -439. 37

494 41

1. 427

3s2 3p4

( 3P)4s 4s 2 P t y 138244. 51 -1014. 71 1. 334 2}f 157674- 30 1. 334

y2 139259. 22 0. 676 ly2 y

158168. 71 158429. 05 —26o! 34 1. 199

0. 000

3s2 3p4

( 3 P)3d 3d 4Jp 4% 142187. 42 -530. 59

-390. 62

-263. 85

3% 142718. 01 3s 2 3p4 (

3 P)4p 4p 2 D° 2y2 158781. 20 -663. 12

1. 241

2y2 iy2 143108. 63

143372. 48

1/2 159394- 32 0. 918

3s 2 3p 4 (

3 P)4p 4p 2p° y2 159707. 46 532. 89 0. 983

3s2 3p4 ( 3P)3d 3d 2 P %

iy2 144710. 90145669. 84 958. 94 1 y2 160240. 85 1. 244

3s 2 3p 4

(

3 P)4p 4p 4 S° 1/2 161049. 65 1. 987

3s2 3p 4 (

3 P)3d 3d 4P y2 147229. 17

274. 95

372. 86 iy2 147504. 12 3s2 3p 4

(

3 P)4p 4p 2 S° K2 161090. 81 1. 695

2y2 147876. 98
217

A II

—Continued

A II

Continued

Config. Desig. J Level Interval Obs. g Config. Desig. J Level Interval Obs. g

3s2 3p4 (x S)4s 4s" 2 S K 167308. 66 1. 993 3s2 3p4 ( 3 P)4d 4d 2D 2K 192557. 77 -155. 16 1. 198

IK 192712. 93 0. 833

3s2 3p4 ( x D)4p 4p' 2F° 2/2 170401. 88

129. 41 0. 857

3/2 170581. 29 1. 140 3s2 3p4 ( 3 P)4/ 4f 4K 194800. 97 -21. 98

-39. 36

-135. 34

3K 194822. 95

3s2 3p4 (x D)4p 4p' 2P° 172211 74 -602. 40 1. 332 2K 194862. 31 K 172817. 14 0. 677 IK 194997. 65

3s2 3p4 CD)3d 3d' 2D 2K 172336. 47 -494. 16 3s2 3p4 ( 3P)4/ 4/ 4D° 31/2 194888. 96 -148. 17 -266. 49

16. 12 IK 172830. 63 2 K

IK

195032. 13

195298. 62

3s2 3p4 ( x D)4p 4

p' 2 D° IK 178348. 78

45. 55 0. 804 K 195282. 50

2K 173394. 83 1. 202

3s2 3p4 (4 D)5s 5s' 2D 2K 195865. 61 -2. 12

3s2 3p4 (x D)3d 3d' 2P IKK

174410. 74

174821. 94?

-411. 20 IK 195867. 73

3s 2 3p4 ( 3P)4f 4/ 1° IK 196077. 40 2P IKK

179593. 09

179932. 83

-339. 74

3s2 3p4 ( 3P)4/ 4/ 2° K 196091. 04

3s2 3p4 ( 3P)5s 5s 4P 2/2 181595. 04 fi98 09 1. 603 3s2 3p4 ( 3 P)4/ 4/ 2D° IK 196622. 78

11. 15

1/2 182223. 06 -729. 08 1. 609 2K 196688. 93 K 182952. 14 2. 550

3s2 3p4 0D)4d 4d' 2 G 3yi 198595. 91

8. 87

3s2 3p4 ( 3P)5s 5s 2P IK 183091. 83 -823. 75

1. 445 4/2 198604. 78 K 183915. 58 0. 816

3s2 3p4 ( 3 P)6s 6s 4 P 2K 198813. 17 -325. 75 -972. 24

535. 40

3s2 3p4 ( 3P)4d 4d 4D 3K 183676. 42 -121. 80

-188. 61 -206. 29

1. 427 IK 199138. 92

2H

i/2K

183798. 22

183986. 83

184193. 12

1. 370

1. 198

0. 380 3s2 3p 4 (4 D)4d

W 2p KK

IK

200111. 16

199447. 56

199982. 96

0. 670

3s2 3p4 (x D)3d 3d' 2 S K 184094. 10

3s2 3p4 (x D)4dW 2D IK 199525. 96

154. 62

3s2 3p4 ( 3P)4d 4d 4F 4H 185093. 92 -531. 55 -449. 59

-266. 33

1. 330 2K 199680. 58 1. 196 3y2 2V2 185625. 47

186075. 06

1. 217

1. 045 3s2 3p4 ( 3P) 6s 6s 2P IKK

200032. 65 -591. 35 ik 186341. 39 0. 612 200624. 00

3s2 3p4 ( 3 P)4d 4<2 4P k 186172. 32

299. 00

420. 60

2. 600 3s2 3p4 (x D)4d

W 2JT 3K 200139. 84 -95. 86 1 k 186471. 32 1. 494 2K 200235. 70 0. 862 2% 186891. 92 1. 588

3s2 3p4 ( 3 P)5d 5d 2P IK 204418. 50 -97. 31 3s2 3p4 ( x S)3<Z 3d" 2D 2/2 IK

186728. 28

186750. 78 -22. 50 K 204515. 81

3s2 3p 4 ( 3 P)5d 5d 2D 2K 204586. 40

3s2 3p4 ( 3P)4d 4d 2F 3/2 186817. 12 -772. 501. 167 IK

2K 187589. 62 0. 861

3s2 3p 4 (x D)4d 4d' 2 S K 205243. 96 2. 004

3s2 3p4 ( 3 P)4d 4d 2P K 189935. 62

658. 00 0. 667

190593. 62 1. 322 3s2 3p 4 (x D)4/ 4f 2po IKK208592. 90

3s2 3p4 ( 3P)5p 5p 2P° IK 190106. 84 -89. 96 y2 190196. 80 3s2 3p4 (‘D)6s 6s' 2 D IK

2K

212932. 88

212934. 30 1. 42

3s2 3p4 ( 3P)5p 5p 2 D° 2/2 IKK

190508. 00

3s2 3p4 ( 3 P)5p 5p 2 S° 191708. 46

A hi ( 3P2 ) Limit __ 222820

3s2 3p4 (‘S)4p 4p" 2P° IK 191975. 16 -358. 93 1. 332 K 192334- 09 0. 760

April 1948.
218

A ii Observed Terms*

Config.

Is2 2s2 2p 6 Observed Terms

3s2 3p5

3s 3p

6

3s2 3p4 (

3 P)wa;

3s2 3p4

(

1 D)nx'

3s2 3p 4 OS)nz"

3p

5 2 P°

3p6 2 S

ns (n> 4) np (n> 4)

/ 4-6s 4 P

\ 4—6s 2 P

4—6s' 2 D

4s" 2 S

4p 4 S° 4p 4 P° 4p

4 D°

4, 5p

2 S° 4, 5p2 P° 4, 5p2 D°

4p' 2 P° 4p' 2 D° 4p' 2 F°

4p" 2 P°

3s2 3p4

( 3 P)nz

3s2 3p 4 (

1 D)nx/

3s2 3p4

(

1 S)nx"

nd (n> 3) nf (n> 4)

/ 3, 4d

4 P 3, 4d 4 D 3, 4d

4 F

\ 3-5d

2 P 3-5d2 D 3, 4d 2 F

3, 4d' 2S 3, 4d' 2 P 3, 4d' 2 D 4d' 2 F 4d' 2 G

3d* 2 D

4f

4 D° 4/ 4 F°

4/ 2 D°

4j> 2p°

*For predicted terms in the spectra of the Cl i isoelectronic sequence, see Introduction.

A m

(S i sequence; 16 electrons) Z=18

Ground state Is2 2s2 2p& 3

2 3p4 3 P2

3p

4 3 P2 329965.80 cm"1 I. P. 40.90 volts

The terms are from de Bruin’s 1937 paper except for singlets which are from Boyce and

Edlen. The 3p

4 *S term, according to Edlen, is derived from the nebular line at 5191.4 A,

identified as the forbidden transition 3p

4 lT) —2>p

4 *S. Intersystem combinations connecting the three systems of terms have been observed.

Unfortunately, no complete or homogeneous list of classified lines exists. Such a list is needed to improve the present term values and to explain the numerical discrepancies in the

various published papers. De Bruin’s terms here designated 3d' 3 P°, 4:d" 3 P° D° F°, and

5s" 3 P° are apparently based on unpublished observational material.

REFERENCES

V. v. Keussler, Zeit. Phys. 84, 42 (1933). (I P) (T) (C L)

T. L. de Bruin, Proc. Roy. Acad. Amsterdam 36, No. 7, 724 (1933). (T) (C L)

T. L. de Bruin, Zeeman Verhandelingen p. 414 (Martinus Nyhoff, The Hague, 1935). (T) (C L)

J. C. Boyce, Phys. Rev. 48, 397 (1935). (I P) (T) (C L)

J. C. Boyce, Phys. Rev. 49, 351 (1936). (T) (C L)

T. L. de Bruin, Proc. Roy. Acad. Amsterdam 40, No. 4, 343 (1937). (I P) (T) (C L)

B. Edl6n, Phys. Rev. 62, 434 (1942). (T) (C L)
Am

A hi

219

Config. Desig. J Level Interval Config. Desig. J Level Interval

3s2 3p4 3p4 3P 210

0. 00

1112. 40

1570. 20

-1112. 40

-457. 80

3s2 3p3 ( 2 D°)4p 4p' 3 P 210

231341. 80

231627. 30

231754. 80

-285. 50

-127. 50

3s2 3p4 3p4 *D 2 14010 3s2 3p3 ( 2 P°)4p 4p" 3 S 1 239193. 48 3

2 3p4 3p4 *S 0 33267 3s2 3p3 ( 2 P°)4p 4p" 3 D 12

240150. 66

240257. 59 106. 93

34. 07

3s 3p5 3p5 3p° 2 118800. 70 QQfi QO 3 240291. 66 10 114797. 60

115828. 40

-530. 80

3s2 3p3 ( 2 P°)4p 4p" 3 P 0 242923. 96

221. 80

279. 21

3s 3p5 3p5 4 P° 1 144023 12 243145. 76

243424. 97

3s2 3p3 ( 4S°)3d 3d 5 D° 0 3s2 3p3 ( 4S°)4d 4d 6D° 0 1 144882. 98 3 04 1 246029. 76

4. 03

2. 85

9. 93 2 144885. 97 6 98 2 246083. 79 3 144892. 95

14. 05 3 246086. 64 4 144907. 00 4 246046. 57

3s2 3p3 ( 4 S°)3d 3d 3D° 3 156917. 62 -7. 06

-106. 72

3s2 3p3 ( 4 S°) 5s 5s 3S° 2 250712. 27 21 156924- 68

157031. 40 3s2 3p3 ( 4 S°)4d 4d 3 D° 1 252272. 92 -19. 23

35. 33 2 252253. 69

3s2 3p3 ( 4 S°)4s 4s 6S° 2 174375. 00 3 252289. 02

3s2 3p3 ( 4 S°)4s 4s 3 S° 1 180679. 00 3s2 3p3 ( 4 S°)5s 5s 3S° 1 252575. 88

3s2 3p3 ( 2 D°)4d 4d' 3F° 2 266722. 80

154. 70

193. 72 3s2 3p3 ( 2 D°)3d 3d' 3 F° 4 186402. 15 -255. 05

-245. 85 3 266877. 50 32

186657. 20

186908. 05 4 267071. 22

3s2 3p3 ( 2 D°)4d 4d' 3 G° 3 267782. 10

51. 10

62. 62 3s2 3p3 ( 2 D°)3d 3d' 3 D° 1 187171. 12

651. 93

891. 00 4 267833. 20 23

187823. 05

188714- 05 5 267895. 82

3s2 3p3 ( 2 D°)4d 4d' 3D° 1 268978. 80

34. 00

-12. 00 3s2 3p3 ( 2 D°)3d 3d' 3P° 0 2 269012. 80 1o

188517. 82 3 269000. 80

3s2 3p3 ( 2D°)4d 4d' 3 P° 2 271507. 88 -164. 20

-24. 14 3s2 3p3 ( 2 D°)4s 4s' 3 D° i 196589. 20

24. 71

65. 89 1 271672. 08 2 196613. 91 0 271696. 22 3 196679. 80

3s2 3p3 ( 2 D°)4d 4d' 3 S° 1 272068. 45

3s2 3p3 ( 4 S°)4p 4p 5P 1 204563. 53

85. 71

148. 13 23

204649. 24

204797. 37

3s2 3p3 ( 2 D°)5s 5s' 3 D° 12 272127. 82

272188. 16 60. 34

62. 74 3 272250. 90

3s2 3p3 ( 2 D°)3d

3s2 3p3 ( 2 P°)4s

3d' 3 S° 4s" 3P° 1 204727. 47

3s2 3p3 ( 2 P°)4d 4d" 3 F° 2 281461. 97

11. 85 2 207233. 09 -299. 06

-141. 01 3 281473. 82 10 207532. 15

207678. 16 4

3s2 3p3 ( 4S°)4p

3s2 3p3 ( 2 P°)4d 4d" 3P° 0 281947. 88

52. 38

98. 88 4p 3 P 2 209151. 82

24. 78

-39. 31 1 282000. 26 10 209127. 04

209166. 35 2 282099. 14

3s2 3p3 ( 2 P°)3d 3d" 3 D° 3 210212. 26 792 59

3s2 3p3 ( 2P°)4d 4d" 3 D° 32 283919. 78

284096. 26 - 176. 48

-22. 25 2 211004. 85 -558. 98 1 284118. 51 1 211563. 83

3s2 3p3 (2 P°)3d 3d" 3 P° 210

218950. 87

214846. 70

214568. 49

-395. 83 -221. 79

3s2 3p3 (2P°) 5s 5s" 3P° 012

285831. 20

285882. 00

286009. 21

50. 80

127. 21

3s2 3p3 ( 2 D°)4p 4p' 3 D 1 225155. 18 -7. 25

254. 66 2 225147. 93

A iv ( 4 S?

h) Limit 329965. 80 3 225402. 59

3s2 3p3 ( 2 D°)4p 4p' 3F 234

226355. 96

226503. 22

226646. 06

147. 26

142. 84

February 1948.
A hi Observed Terms*

Config.

Is2 2s

2 2p

6 +

Observed Terms

3s2 3p4 { 3p* 4 S

3p* *P

3p4 !D

3s 3p*

{

3p5 3p°

3p5 1 P°

ns (n> 4) np (n> 4)

3s2 3p3

(

4 S°)ns J4, 5s *S°

\4, 5s 3 S°

4p

5 P

4p

3 P

3s2 3p3

( 2 D°)nx' 4, 5s' 3 D° 4p' 3 P 4p' 3 D 4p' 3 F

3s2 3p3

(2 P°)nx" 4, 5sr 3P° 4p" 3 S 4p” 3 P 4pw 3 D

nd (n> 3)

3s2 3p3

( 4 S°)nx

{

3, 4d 5 D°

3, 4d 3 D°

3s2 3p3

( 2 D°)nx' 3, 4d' 3 S° 3, 4d' 3 P° 3, 4d' 3 D° 3, 4d' 3 F° 4d' 3 G°

3s2 3p3

( 2 P°)nx" 3, 4d" 3 P° 3, 4d'r 3 D° M" 3 F°

*For predicted terms in the spectra of the S I isoelectronic sequence, see Introduction.

A IV

(P i sequence; 15 electrons) Z=18

Ground state Is2 2s2 2p

6 3s2 3p3 4S°x

3tf

4S°h 482400 cm'1 I. P. 59.79 volts

The analysis is incomplete. Boyce has classified 26 lines in the range between 396 A and

1197 A and listed 8 terms.

De Bruin has extended the analysis and published the term list which is quoted here.

Intersystem combinations connecting the doublet and quartet terms have been observed.

The ionization potential estimated by Edlen from isoelectronic sequence data has been

used to calculate the limit (entered in brackets in the table).

REFERENCES

J. C. Boyce, Phys. Rev. 48, 401 (1935). (I P) (T) (C L)

B. Edl6n, Zeeman Verhandelingen p. 91 (Martinus Nyhoff, The Hague, 1935). (I P)

T. L. de Bruin, Physica 3, No. 8, 809 (1936). (T) (C L)

A. B. Rao, Ind. J. Phys. 13, 399 (1938). (T) (C L)
221

A iv A IV

Config. Desig. J Level Interval Config. Desig. J Level Interval

3s2 3

p

3 3p3

S° 1/2 0. 00 3s2 3p2

(

3 P)4p 4p 4 D° X 285960. 17

268. 63

522. 88

804. 15 1/ 286228. 80

3s2 3

p

3 3p3 2 D° i/2 21090 129 2/ 286751. 68

2/ 21219 3/ 287555. 83

3s2 3p3 3

p

3 2 P° X 84854 181 3s2 3p2

(

3 P)4p 4p 4 P° X

1 X

289125. 88

111. 94

596. 86 1/ 35085 289287. 82

2/2 289884. 68

3s 3

p

4 3p4 4 P 2/2 117564 951

3s2 3p2 ( 1/2 118515 3 P)4p -529 4p 2 D° 1/2 290256. 45 1411. 28 / 119044 2/ 291667. 73

3s 3p4 3p4 2 D 1/2 2/

145921

146000 79 3s2 3p2

(

3 P)4p 4p

4S° I /2 291748. 70

3s2 3p2

(

3 P)4p 4p 2 P° X 295674- 54 132. 23

3s 3

p

4 3p4 2 P 1/2/

166356

167444 -1088 1 X 295806. 77

3s2 3p2

(

3 P)4p 4p 2 S° X 299568. 20

3p

4 3p4 2S X 177833

3s2 3p2

(

1 D)4p 4p' 2 F° 2/4 304074. 29

325. 61

3s2 3p2

(

3P)4s 4s 4 P x 250219. 45 RS7 1 * 3/ 804899. 90

i X

2/

250906. 60

251972. 00 1065. 403s2 3p2

(

1 D)4p 4p' 2 D° 2/

1/2 806286. 28

806308. 25 -71. 97

3s2 3p2

(

3P)4s 4s 2 P X

1 X

2/

1/2

256093. 29

257348. 89 1255. 60

3s2 3p2

(

1 D)4s 4s' 2 D 268151. 38 -20. 00 A v ( 3P0) Limit [482400] 268171. 38

November 1947.

A iv Observed Terms*

Config.

Is2 2s2 2p6 +

Observed Terms

3s2 3p3 |3p

3

S°

3p3 2 P° 3p3 2 D°

3s 3p4 {3p4 2 S CO

CO

a.

i*. 3p4 2 D

ns (n> 4) np (n> 4)

3s2 3p2

(

3 P)n#

{

4s 4 P

4s 2 P

00 4p 4 P° 4p 4 D°

4p 2 P° 4p 2 D°

3s2 3p2

(

x D)nx' 4s' 2 D 4p' 2 D° 4p' 2 F°

*For predicted terms in the spectra of the P i isoelectronic sequence, see Introduction.
(Si i sequence; 14 electrons) Z=18

Ground state Is2 2s2 2p

6 3s2 3p

2 3P0

3^2 3 P0 605100 cm-1

I. P. 75.0 volts

The terms have been taken from the paper by Phillips and Parker. This includes the

earlier work by Boyce. Thirty-six lines have been classified in the region between 336 A and

836 A. Intersystem combinations connecting the singlet and triplet terms have been observed.

No quintet terms have been found.

Using the method suggested by Edlen for extrapolation along the isoelectronic sequence,

the writer has estimated the value of the limit quoted above and entered in brackets in the

table.

REFERENCES

J. C. Boyce, Phys. Rev. 48, 401 (1935). (I P) (T) (C L)

B. Edl6n, Zeeman Verhandelingen p. 91 (Martinus Nyhoff, The Hague, 1935). (I P)

L. W. Phillips and W. L. Parker, Phys. Rev. 60, 301 (1941). (T) (C L)

A v A v

Config. Desig. J Level Interval Config. Desig. J Level Interval

3s2 3p

2 3p2 3 P 0 0 765

1267

3s2 3p(2 P°)3d 3d 3P° 2 217578 708

12 765

2032

10

218286

218642

-356

3s2 3p

2 3p21D 2 16301 3s2 3p(2 P°)3d 3d 3 D° 1 224316 289

2 224505 212

3s 3p3 3p3 3 D° 1 121632 46

132

3 224717

2 121678

3 121810 3s2 3p(2 P°)4s 4s 3P° 0 295742 ^07

1 296249 1644

3s 3p3 3p3 3 P° 2 141764 -9 2 297893

1,0 141773

3s2 3p(2 P°)4s 4s »P° 1 301300

3s 3p3 3p

3 3 S° 1 191537

3s 3p3 3v3 J P° 1 195356

A vi (

2 P£) Limit [605100]

October 1947.
223

A vi

(AI i sequence; 13 electrons) Z=18

Ground state Is2 2s2 2p6 3s2 3p

2Pi

°

2

3p

2P

°A 736600 cm"1 I. P. 91.3 volts

The analysis is by Phillips and Parker, who have classified 37 lines in the region between

180 A and 596 A. No intersystem combinations have been observed. They estimate that

3p2 4 P^ is 100,000 cm-1 above the ground state, with an uncertainty x equal to ± 1000 cm-1

. This value is entered in brackets in the table, and it has been added to the published values of

all quartet terms.

Their limit, derived from the three members of the 3p

2P°—nd T) series is 721300 ±300

cm-1

(I. P. 89.41 ±0.04). Using the method suggested by Edlen, the writer has extrapolated

the value of the limit quoted above and entered in brackets in the table. The uncertainty in

this estimate is large because of the incompleteness of the isoelectronic sequence data.

REFERENCE

L. W. Phillips and W. L. Parker, Phys. Rev. 60, 301 (1941). (I P) (T) (C L)

A vi A VI

Config. Desig. J Level Interval Config. Desig. J Level Interval

3s2

(

xS)3p 3p

2P° X 0 3s 3p(3 P°)3d 3d 4 D° V2 319121 +x 272

222

132

i X 2210 2210 IX 81 9398 +x

2X 819615+x

3s 3

p

2 3p2 4P X [100000] ±x 802

1232

3y2 319747+x

IX 100802 +x

2x 102034 +3 3s2

(

1 S)4s 4s 2S X 342286

3s 3p2 3p2 2S X 169801 3s 3p(3 P°)4s 4s 4P° X 453954 +z 762

3s 3p2 X

IX 45471 6 +x 1399

3p2 2 P 182182 1395 2y2 456115+x

3s2

(

1S)3d

i /2 183577

3s2

(

1S)4d 4d 2 D IX 454760 50 3d 2D ix

2y2 218592

218657 65 2X 454810

3s2 (

1S)5d 5d 2 D ix 555330 225

3p3 3p3 4S° 1 X 270356 +x 2y2 555555

3s 3p(3P°)3d 3d 4P° 2)4 IXx

316199 +x -616

-483 316815 +x

317298 +x A vn (

xSo) Limit [736600]

September 1947. A vi Observed Terms*

Config.

Is2 2s2 2p8 ±

Observed Terms

3s 2 (

x S) 3p 3p

2 P°

3s 3p2 / 3p2 4 P

\3p2 2 S 3p2 2 P

3p3 3p 3 4 S°

ns (n>4) nd (n> 3)

3s2

(

J S)nx 4s 2 S 3-5d 2 D

3s 3p(3 P°)nx 4s 4P° 3d 4 P° 3d 4 D°

*For predicted terms in the spectra of the Al i isoelectronic sequence, see Introduction.
224

A VII

(Mg i sequence; 12 electrons) Z=18

Ground state Is2 2s2 2p

6 3s2 'So

3s2 'So 1000400 cm-1

I. P. 124.0 volts

Phillips and Parker have classified 25 lines in the interval between 151 A and 644 A. No

intersystem combinations have been observed.

From the D-series they derive an absolute value of Sp 3Pq equal to 891000 ±200 cm-1

, and by extrapolation along the isoelectronic sequence estimate the absolute value of 3s2 'S0 as 1005000 ±1000 cm-1

. From later data on this sequence the writer has extrapolated these values by the method

suggested by Edlen, and adopted the revised entries given in the table in brackets.

REFERENCE

L. W. Phillips and W. L. Parker, Phys. Rev. 60, 305 (1941). (I P) (T) (C L)

A vii A VII

Config. Desig. J Level Interval Config. Desig. J Level Interval

3s2 3s2 !S 0 0 3s(2 S)4p 4p ‘P0

1 566362

3s(2S)3p 3v

3 P° 0 [113095] +x 3s(2 S)4d 4d 3 D 1 634584 +X 38

75

1 113900 +x 1681 2 634622 +x

2 115581 +x 3 634697+x

3s(2 S)3p 3p J P° 1 170720 3s(2 S)4/ 4/ 3 F° 2, 3,4 660092

3p2 3p2 3 P 0 269829 +x 941

1784

3s ( 2S) 5d 5d *D 1 772300+x 25

30

1 270770 ±x 2 772325 +x

2 272554 ±x 3 772355 +x

3s(2S)3d 3d 3 D 1 324097 +x 39

48 2 324136 +x

3 324184 ±x A viii (

2S^) Limit [1000400]

3s(2 S)4s 4s 3 S 1 514083 +s

August 1947. A VIII

(Na i sequence; 11 electrons) Z=18

Ground state Is2 2s2 2p

6 3s

2S^

3s 2S^ 1157400 cm"1 I. P. 143.46 ±0.05 volts

Phillips and Parker classified 23 lines in the interval 120 A to 526 A. The resonance

lines calculated at 700.398 A and 713.990 A, have not been observed. Absolute term values were derived from four members of the 2D-series.

REFERENCE

L. W. Phillips and W. L. Parker, Phys. Rev. 60, 305 (1941). (I P) (T) (C L)
225

A vm A VIII

Config. Desig. J Level Inters al Config. Desig. J Level Interval

3s 3s 2 S y 0 5s 5s 2 S y 812422

3V 3p

2P° H 140058 2718 5p 5p2 P° y

iy

832245 446

1/4 142776 832691

3d 3d 2 D i y 332576 151 5d 5d

2 D iy 865084 27

2H 332727 2y 865111

4s 4s 2S 575910 5/ 5/ 2F° 2y

3y2 875248

875277 29

4p 4p 2P° Yt 62,8240 997 iy 629237

6d 6d 2 D / 1 y

1 2)4 }

955560

4d 4d 2 D iy2 2H

2y2 3%

697471

697548 77

4f 4f

2F° 716818 34 A ix OSo) Limit 1157400

716852

June 1947.

A IX

(Ne i sequence; 10 electrons) Z= 18

Ground state Is2 2s2 2p0 ‘S0

2p

6 ‘S0 cm-1

I. P. 421 volts

Two lines observed at 49.180 A and 48.730 A have been classified by Phillips and Parker

as combinations with the ground term. The measurements may be in error by ±0.002 A or ±100 cm-1

. As for Ne i, the jT-coupling notation in the general form suggested by Racah is here

introduced.

REFERENCES

L. W. Phillips and W. L. Parker, Phys. Rev. 60, 306 (1941). (T) (C L) G. Racah, Phys. Rev. 61, 537 (L) (1942). B. Edl6n, Zeit. Astroph. 22, 62 (1942). (I P)

A IX

Authors Config. Desig. J Level

‘So 2p« 2p« ‘S 0 0

2p6

(

2 Pfo)3s 3s [i yj° 2

*Pi 1 2033350

2p5(2 P^)3s 3s'

[ y\° 0

‘Pi 1 2052120

April 1947.
226

AX

(F i sequence; 9 electrons)

Ground state Is2 2s2 2p5 2P°m

N)II rH 00

2

p

5 2 P°y

3 cm-1

I. P. volts

This spectrum has not been analyzed. By interpolation along the F i isoelectronic

sequence from F i through Ca xii, Edlen derives a reliable estimated value of the interval of

the ground term, 2

p

5 2P°^— 2p5 2P^, equal to 18063 cm-1

. The faint coronal line observed

at 5536 A, wave number 18059 cm-1

, may thus be tentatively identified as this forbidden line

of A x, according to Edlen.

REFERENCE

B. Edl6n, Zeit. Astroph. 22, 59 (1942). (T)

March 1947.

A XI

(0 i sequence; 8 electrons)

Ground state Is2 2s2 2p4 3 P2

Z=18

2p

4 3 P2 cm-1

I. P. volts

This spectrum has not been analyzed. By extrapolation along the O i isoelectronic

sequence Edlen estimates the separation 2p

4 3P2 —2p4 3Pi to be approximately 14449 cm-1

, or 6919 A. This line has not been identified in the solar corona. REFERENCE

B. Edl6n, Zeit. Astroph. 22, 59 (1942).

March 1947.

(T)

A XIV

(B i sequence; 5 electrons)

Ground state Is2 2s2 2p

2P^

Z=18

2p

2Pj cm-1

I. P. volts

By extrapolation of the B i isoelectronic sequence, Edlen estimates that the separation of

the lowest term 2p 2 Pi^— 2p 2P?K, falls near enough to warrant tentative identification of the

coronal line observed at 4359 A (wave number 22935 cm-1

) as [A xiv].

REFERENCE

B. Edl6n, Zeit. Astroph. 22, 59 (1942). (T)

March 1947.
POTASSIUM

Kl

19 electrons Z=19

Ground state Is2 2s2 2p6 3s2 3p

e 4s 2S^

4s

2Si^ 35009.78 cm-1

I. P. 4.339 volts

H. R. Kratz has observed in absorption the np 2P° series to n—79. He has generously

furnished a list of his final term values in advance of publication, for inclusion here. His

value of the limit is quoted. The series ns

2S (n=4 to 8), nd 2D (n=2> to 6), and nj 2F° (n =

to 9) are from Edlen, who revised the older values. Edlen remarks that the ns 2S and nd 2D

series can best be continued by an extrapolation of the appropriate series formula, since the

observed wavelengths are uncertain. This comment applies to the listed values of ns 2S(n=9

to 13), which are from Fowler’s Report. Mack has furnished revised values of nd 2D(n=8

to 13), derived from observations of the forbidden transitions 6s—nd on the plates of Kratz.

The last two members of this series are, respectively, 34213.1 and 34332.6.

From Paschen’s classifications of far infrared lines Edlen concludes that the 5g 2 G and

6h

2H° terms are H-like. The terms derived from these calculations are entered in brackets

in the table. Compared with all others, the terms 4/ 2F°, 5/ 2F°, and 5s 2S, derived from far

infrared observations, are somewhat uncertain, according to Edlen.

No attempt has been made to give a complete bibliography of papers dealing with hyperfine structure of K i. From interferometric measures of the combinations 4p

2T

> °—nd 2D

(n—5 to 8) Masaki and Kobayakawa observe the following term intervals:

n=5 6 7 8

nd 2 D -0. 503 -0. 262 -0. 158 -0. 096

4p

2 P£-4p2 P!H 57. 600 57. 600 57. 599 57. 600

The papers on Zeeman effect deal only with forbidden transitions of K i. From observations in a magnetic field of the lines at 4642 A and 4641 A (4s 2S—

3

d

2D) Segre and Bakker

observe the interval of 3d

2D to be 2.325 ±0.015 cm-1

. The Kib resonance lines have been observed in absorption by Beutler and Guggenheimer

at 662.38 A and 653.31 A. The 4s2 2P° term in the table has been calculated from these lines. REFERENCES

S. Datta, Proc. Roy. Soc. London [A] 101, 539 (1922). (I P) (T) (C L)

A. Fowler, Report on Series in Line Spectra p. 101 (Fleetway Press, London, 1922). (I P) (T) (C L)

F. Paschen und R. Gotze, Seriengesetze der Linienspektren p. 59 (Julius Springer, Berlin, 1922). (I P) (T)

(C L)

W. Grotrian, Graphische Darstellung der Spektren von Atomen und Ionen mit ein, zwei and drei Valenzelektronen, Part II, p. 29 (Julius Springer, Berlin, 1928). (G D)

E. Segr& und C. J. Bakker, Zeit. Phys. 72, 724 (1931). (Z E) H. Beutler und K. Guggenheimer, Zeit. Phys. 87, 188 (1933). (T) (C L)

W. F. Meggers, Bur. Std. J. Research 10, 673, RP558 (1933). (C L)

W. F. Meggers, J. Research Nat. Bur. Std. 14, 497, RP781 (1935). (C L)

B. Edl6n, Zeit. Phys. 98, 453 (1936). (I P) (T) (C L)

O. Masaki and K. Kobayakawa, J. Sci. Hirosima Univ. [A] 6, 217 (1936). (C L)

F. A. Jenkins and E. Segr&, Phys. Rev. 55, 545 (1939). (Z E)

W. F. Meggers, J. Opt. Soc. Am. 36, 431 <1946). (Summary hfs) H. R. Kratz, unpublished material (Dec. 1947). (I P) (T)
228

KI Ki

Config. Desig. J Level Interval Config. Desig. J Level Interval

3p6 ( xS)4s 4s 2S A 0. 00 3p6 ( 1 S)lls 11s 2 S A 33598. 17 3p8 ( x S)4p 4p 2 P° A

1/2 12985. 17

18042. 89 57. 72 3p6 ( 1 S)9/ 9/ 2 F° { 3/ l 2/2 } 88652. 0

3p8 ( x S)5s 5s 2 S A 21026. 8 3p«( 1 S)llp lip 2 P° z 33786. 60

0.84 IZ 88787. 44

3p8 ( x S)3d 3d 2 D 2/ 21534. 42 -2. 33 1/ 21536. 75

3p«( 1 S)10d 10^ 2 D / 2/2 l IZ } 33851. 76

3p8 ( x S)5p 5p 2 P° Z 24701. 44 18. 76

2>vK 1/ 24720. 20 l $)Ws 12s 2S z 33869. 7 3p6 ( x S)4d 4d 2D 2/ 27397. 01 -1. 10 3p6 ( 1 S)12p 12p 2 P° A 88972. 84 a 60

1/2 27398. 11 iz 83972. 94

3p8 ( xS)6s 6s 2S z 27450. 65 3p«( 1 S)lld lid 2 D r 2« t IK |

34056. 

3p 8 ( x S)4/ 4/ 2F° r 3/ l 2/ } 28127. 7 3p6 ( x S)13s 13s 2 S z 34069. 3 3p«( 1 S)13p 13p 2 P° z 84148. 15 0.48 3p8 ( x S)6p 6p 2 P° A

1/

28999. 29

29007. 70 8. 41 IZ 84148. 63

2/

3p8 ( x S)14p 14p 2 P° z 34282. 77

0. 38 3p8 ( xS)5d 5d 2 D 30185. 18

30185. 69

-0. 51 iz 84288. 15

1/2 3p6 ( 1 S) 15p 15p 2 P° z 34888. 16

0. 30 3p8 ( x S) 7s 7s 2S z 30274. 26 IZ 84888. 46

3p8 ( x S)5/ 5/ 2 F° I 3A l 2/ } 80605. 6 Spo/S^p 16p 2 P° z

iz

84472. 18

34472. 48 0. 25

3p8 ( x S)5<7 5g 2 G J 3/2 i 4A } [30619.8] 3p6 0S)17p 17p 2 P° z

iz

84540. 23

34540. 44

0. 21

3p8 ( x S)7p 7p 2 P° z

1Z

31069. 98

81074- 46

4. 48 3p6 ( 1 S)18p 18p 2 P° / z l IZ } 84596. 27

3p«( 1 S)6d 6d 2 D 2/

1Z

31695. 51

31695. 75 -0. 24 3p6 ( x S)19p 19p 2 P° { % l IZ } 34642. 78

3p8 ( x S)8s 8s 2S }4 31764. 95

3p6 ( 1 S) 20p 20p 2 P° ; z 1 iz

3p8 ( x S)6/ 6/ 2 F° I 3Z l 2/ | 81953. 0 j 34681. 84

3p6 ( x S)21p 21p 2 P° j z l IZ r Vc } 34714. 98

3p8 ( xS)6fr 6h 2H° / 4Z l 5Z \ [31960. 6] 3p6 ( 1 S)22p 1 J 22p 2 P° J 72 l iz | 34748. 87

3p8 ( x S) Qg 6<7 2 G J 3/2 l 4/2 j

[31960.8]

3p6 ( 1 S)23p 23p 2 P° / z l IZ } 34767. 78

3p8 ( x S)8p 8p 2 P° Z

1Z

82227. 42

32230. 12 2. 70

3p6 ( x S)24p 24p 2 P° / z l IZ } 84789. 03

3p6 ( 1 S)7d 7d 2 D / 2/2 l 1Z } 32598. 46

3p6 ( 1 S)25p 25p 2 P° / z l IZ } 34807. 62

3p6 ( 1 S) 9s 9s 2S A 32648. 17

3p6 ( 1 S)7/

3p«(1S)9p

3p 8 ( x S)8d

3p8 ( x S)10s

2po

9p 2P° 8d 2 D

10s 2S / 3Z l 2/A

iZ / 2/2 l 1Z } 82764. 52

82940. 34

82942. 08 } 33178. 36

33214. 39

1. 74

3p8 ( 1 S)26p

3p8 ( x S)27p

3p6 ( x S)28p

3p6 ( x S)29p

26p 2 P°

27p 2 P°

28p 2 P°

29p 2 P° J z l IZ J A \ iz f A \ IZ | 84823. 83 } 34888. 80 } 84851. 11 } 84862. 52 z

3p8 ( xS)8/ 8/ 2F° / 3/2 \ 2/2 } 88291. 04 3p8 ( x S)30p 30p 2 P° J | 34872. 70

3p6 ( 1 S)10p lOp 2 P° z

iz

83410. 34

83411. 54

1. 20 3p8 ( x $)31p 31p 2P°

IK } 34881. 94

3p8 ( x S)9d 9d 2 D / 2/ l IZ } 33572. 11 3p«(

xS)32p 32p 2P° } 34890. 20
K I—Continued K I—Continued

229

Config. Desig. J Level Interval Config. Desig. J Level Interval

3p6

(

x S)33p 33p 2P° { x

i ix }

34-897. 75 3p8 (

1 S)58p 58p

2 P° { y2 } 34975. 15

3p6

(

1 S) 34p 34p 2 P° I X

\ i/ } 34904- 57 3p8

(

1 S)59p 59p 2P° ; x

\ 1X } 34976. 36

3p8 (*S)35p 35p 2 P° / /

i vx } 34910. 79 3p6

(

1S) 60p 60p 2 P° / X

\ 1 / } 34977. 50

3p8 (

1 S)36p 36p 2 P° { y2 l 1/2 }

34916. 51 Sp^^Glp 61p 2 P° / X

l 1 X } 84978. 62

3p6 (

1 S)37p 37p

2 P° / x

t i X } 34921. 69 3p8

(

1S)62p 62p 2 P° / X

l 1 X j 34979. 60

3p6

(

1 S)38p 38p 2P° i x

l l X } 34926. 47 3p8

(

1 S)63p 63p 2 P° [ y2 l 1 X } 34980. 65

3p6 (

1S)39p 39p 2 P° i y2 l i X } 34930. 91 3p6 (1 S) 64p 64p 2 P° f X

l 1X } 34981. 58

3p6 (

1S)40p 40p 2 P° J X

l 1/2 | 34934. 97 3p8

(

1 S)65p 65p 2P° / X

l 1 X } 34982. 47

3p6

(

1 S)41p 41p 2 P° / X

l i X | 34938. 72 3p6

(

1 S)66p 66p 2 P° f /

l 1/2 } 34983. 27

3p 6 (

1S)42p 42p 2P° / %

l i X } 34942. 20 3p8

(

1 S)67p 67p 2 P° / X

t 1/2 } 34984- 10

3p8 (

1S)43p 43p 2 P° s X

\ i X }

34945. 49 3p8

(

1 S)68p 68p 2 P°

t 1X } 84984. 83

3p8 (

1S)44p 44p 2 P° i y2 t IX } 34948. 48 3p6

(

1 S)69p 69p 2 P°

l 1 X } 34985. 57

3p6 (

1 S)45p 45p 2P° { y

1. i/ } 34951. 26 3p6 (

1 S)70p 70p 2 P° ; x

1 1/2 } 34986. 25

3p8 (

1S)46p 46p 2 P° J X

l i X } 34953. 85 3p8 (

1 S)71p 71p 2P° j y2 l 1 X } 34986. 96

3p6

(

1S)47p 47p 2P° { y2 t 1/2 |

34956. 32 3p6 (

1 S) 72p 72p

2P° i H

l 1X } 34987. 53

3p6 (

1S)48p 48p 2 P°

{ J } 34958. 61 3p8 (

x S)73p 73p 2 P° { H

l 1 X } 34988. 19

3p8

(

1S)49p 49p 2P° iS } 34960. 73 3p6 (

1 S)74p 74p 2P° / X

\ 1 X } 34988. 85

3p8 (

1S)50p 50p 2 P° & | 34962. 83 3p8 (

1S) 75p 75p2 P° { y2 l IX } 84989. 4

3p8 (

1 S)51p 51p 2P° & } 34964- 67 3p8 (

1 S)76p 76p 2P° $ } 34989. 9

3p8 (

1S)52p 52p2P° j } 34966. 45 3p6

(

1S)77p 77p

2P° $ | 34990.

5

3p8

(

1 S)53p 53p 2P° $ } 34968. 09 3p8 (

1 S)78p 78p2 P° $ | 34990. 8

3p8 (

1 S)54p

3p6 (

1S)55p

54p 2P°

55p

2P°

j

&

}• 34969. 69

)• 34971. 17

3p8

(

1S)79p 79p 2 P°

} 34991. 2

K 11 (iS0) 3p5

( 3 P5)4s2 3p5

(

1 Pi)4s2

Limit 35009. 78 3p8

(

1 S)56p

3p8 (

1 S)57p

56p 2P°

57p 2 P°

j

j

\ 34972. 57

\ 34973. 88

4s2 2 P° 1

150970

153066 -2096

May 1948.
230

Kn

(A i sequence; 18 electrons) Z=19

Ground state Is2 2s2 2p6 3s2 3p

6

3p6 XS0 256637 cm-1

I. P. 31.81 volts

Most of the levels were found by de Bruin, whose analysis is repeated in the three refer- ences listed under his name. The present list is taken from the paper by Bowen, who ex- tended the earlier work by observations in the ultraviolet near 600 A, which served to connect

de Bruin’s levels with the ground term. Bowen also determined the limit from the 4s- and

5s-series and extended the assignments of the Paschen notation to all but 2 of the 20 levels

thus far identified in this spectrum. This notation is entered in column one of the table

under the heading “A i”. As for A i, the j/-coupling notation in the general form suggested by Racah is adopted.

The writer has suggested tentatively the tabular designation of the level labeled Yu by de

Bruin. The pairs nd[3^]° and ft(f[l]4] 0 are partially inverted as compared with Ne i. The AiS'-designations ns 3P2io,

x Pi can probably be safely assigned to the levels ns5, nsi} ns3 , ns2, respectively.

REFERENCES

T. L. de Bruin, Zeit. Phys. 38, 94, 1926; Proc. Royal Acad. Amsterdam 39, No. 5, 713 (1926); Arch. N6erl.

Sci. exactes et naturelles, [III A] 11, 75 (1928). (T) (C L) (E D) (Z E)

I. S. Bowen, Phys. Rev. 31, 499 (1928). (I P) (T) (C L)

G. Racah, Phys. Rev. 61, 537 (L) (1942).

K II K II

A i de

Bruin Config. Desig. J Level A i de

Bruin Config. Desig. J Level

lpo 3p6 3p6 iS 0 0 2p2 P9 3p5(2 P£)4p 4p' [ y2 ] 1 190134. 8

2pi Pio 0 194776. 1

ls6 x2 3pH2 P?*)4s 4s [1341° 2 162507. 0

ls4 x3 1 163237. 0 2s5 y2 3p5

(

2 P!^)5s 5s [134]° 2 212575. 5

2s4 y3 1 212992. 9

ls3 X7 3p5

(

2 P£)4s 4s' [ K]° 0 165149. 5

ls2 Xg 1 166461. 5 2s3 y4 3p5

(

2 P£)5s 5s' [ yr 0 214727. 0

2s2 y5 1 215018. 8

3dg x4 3ps (

2 Pin)3d CO o 0 163436. 3

3d5 X5 1 164496. 1 3p5

(

2 Pi^)4d 4d [ y2 ]° 0

4d5 Y6 1 215404- 9

ft 3d [3)4]° 4

3di x9 3 170835. 4

It 4d [334]° 4 4d4 y9 3 217726. 4 dd3 Xa II 3d [1)4]° 2 164932. 3

1 4d3 y7 // 4d [134]° 2 215855. 8

3di X10 It 3d [2/2 ]° 2 171526. 8

3 4d" Yio ft 4d [2>4]° 2

3 219196. 2

2pio Pi 3p5

( 2 Pfo)4p 4p [ y2 \ 1 183208. 4 Y8 3p5(2P£)4d 4d' [ ?

]° 2 217066. 3

2 pt p2 It 4p [2)4] 3 186388. 5

It 4d' [134]° 2 2p8 p3 2 186685. 6 Y„ 1 223124- 1

2p? p4 If 4p im 1 187531. 1 2p6 Ps 2 188154. 4 K m ( 2 P?*) Limit 256637

2p5 P8 n 4P [ >4] 0 189772. 0 K m (

2 P£) Limit 258803

2pi Pe 3p 5

(

2 P^)4p 4p' [134] 1 189243. 7 2p3 P7 2 189661. 7 May 1948.
K ii Observed Levels *

Config.

Is 2 2s2 2

p

6 3s2 +

Observed Terms

3p8 3p

6 X S

ns (n> 4)

3p5

(

2 P°)nx / 4, 5s 3 P°

\ 4, 5s ip°

^-Coupling Notation

Observed Levels

ns (n> 4) np (n> 4) nd (n> 3)

3p5

(

2 Pix)nx 4, 5s [iy2]° 4p [ y2] 4p [2 y2 ] 4? [m

3, 4d [ y2r

3, 4d [3/2 ]° 3, 4d [iy2 ]° 3, 4d [2 y2 ]° 3p5

(

2 P&)nx' 4, 5s'[ y2y 4p/ [lKl

4p'[ y2] 4d'[l^] 0

*For predicted levels in the spectra of the A i isoelectronic sequence, see Introduction.

Km

(Cl i sequence; 17 electrons) Z= 19

Ground state Is2 2s2 2p* 3s2 3p5 2Pi^

3p

5 2Pj^ 369000 cm-1

I. P. 46 volts

The analyses by various investigators are discordant, but nearly 80 lines have been

classified in the range between 325 A and 3885 A.

From observed intersystem combinations Edlen has derived a correction of +667.7 cm-1 to the absolute values of the doublet terms given by de Bruin, to connect them with the

quartet terms. Edlen also states that the limit derived by extrapolation along the isoelectronic sequence is 369000 cm-1

. This limit (entered in brackets in the table), indicates a correction of about —8000 cm-1 to the limit listed by de Bruin, 377000 cm-1

. The doublet terms as given by Edlen and the quartet terms from de Bruin have been used

in compiling the present list. The additional terms are from Tsien.

Kruger and Phillips designate as 4s" 2SH the level at 246012 cm-1

, given by Tsien as

3d' 2Di^. Further study is needed to confirm the terms from the higher limits.

REFERENCES

T. L. de Bruin, Zeit. Phys. 53, 658 (1929). (IP) (T) (C L)

B. Edl6n, Zeit. Phys. 104, 410 (1937). (I P) (T) (C L)

P. G. Kruger and L. W. Phillips, Phys. Rev. 51, 1087 (1937). (T) (C L) W.-Z. Tsien, Chinese J. Phys. 3, No. 2, 118 (1939). (T) (C L)
232

K in K in

Config. Desig. J Level Interval Config. Desig. J Level Interval

3s2 3p6 3p

5 2p° IX 0

2162 -2162 3s2 3p4 (

1 S)4s 4s" 2S X 241667

3p6 2 S

3s2 3p4 ( 3 P)4p 4p

2 D° 2/ 243120. 6 -327. 6 3p8 / 130609 1 X 243448. 2

3s2 3p4

( 3 P)3d 3d 2 D 1/2 2/

190916

192082 1166 3s2 3p4 ( 3 P)4p 4p

2P° ix

X

243947. 4

245382. 3 - 1434. 9

3s2 3p4 ( 3P)3d 3d 2F J 3/

l 2/ |

201165 3s2 3p4

(

1 D)3d 3d' 2 D 2/

1/

244523

246012 -1489

3s2 3p4 (

3 P)4s 4s 4P 2/

IX

%

207421. 9 208687. 8 -1265. 9 -773. 5

3s2 3p4

( 3 P)4p 4p

4 S° 1/ 246625. 6 209461. 3 3s2 3p4 (*D)3d 3d' 2S X 250857

3s2 3p4 ( 3P)4s 4s 2P 1/2H212725. 4

214232. 3 - 1506. 9

1 252040

3s2 3p4

( 3 P)5s 5s 2P 1 / 262828 -942 3s2 3p4

(

4 D)4s 4s' 2 D 2/

i X

225051

225082 -31 X 263770

3s2 3p4

(

1 D)5s 5s' 2 D 2/ 289400 -115 3s2 3p4

(

3P)4p 4p 4P° 2/ 237512. 0 -400. 2 -542. 9

1 x 289515

3s2 3p4 (

3P)4p

1/2K

237912. 2

238455. 1 3s2 3p4

(

1 S)3d 3d" 2 D 2/

1 X

302404

303902 -1498

4p 4 D° 3/ 240829. 9 -613. 6 -721. 8

-361. 4

2/ 241448. 5 2 307429

i/2/

242165. 3

242526. 7

3s2 3p4

(

J D)3d 3d' 2P 1/ 241039 -1509 K iv (

3 P2) Limit [369000]

242548

January 1948. K hi Observed Terms*

Config.

Is2 2s2 2p

6

[ Observed Terms

3s2 3p

5

3s 3pa

3s2 3pi

(z'P)nx

3s2 3p*(}T>)nx'

3s2 3p4

(

x S) nx"

3p5 2po

3p6 2 S

ns (n> 4? np (n> 4) nd (n> 3)

/ 4s 4P

\ 4, 5s 2 P

4, 5s' 2 D

4s" 2 S

4p 4S^ 4p

4 P° 4p4 D°

4p

2P° 4p 2 D° 3d 2D 3d 2F

3d' 2S 3d' 2P 3d' 2 D

3d" 2 D

*For predicted terms in the spectra of the Cl I isoelectronic sequence, see Introduction.
233

K IV

(S i sequence; 16 electrons) Z=19

Ground state Is2 2s2 2p6 3s2 3

p

4 3 P2

3pi 3 P2 491300 cm-1

I. P. 60.90 volts

The terms are from the papers by Bowen and by Tsien, with the revised values of 3

p

4 *S

and 3p5 : P° suggested by Edlen, and of 4s 3 S° by Mrs. Beckman. Colons have been added by

the writer to some levels that appear to need further confirmation.

Nearly 60 lines have been classified in the region between 271 A and 754 A. Intersystem

combinations connecting the singlet and triplet terms have been observed.

The limit is from Edlen’s 1937 paper. He has derived it by extrapolation of isoelectronic

sequence data.

REFERENCES

M. Ram, Indian J. Phys. 8, 155 (1933). (T) (C L)

I. S. Bowen, Phys. Rev. 46, 791 (1934). (T) (C L)

B. Edlen, Zeit. Phys. 104, 192 (1937). (I P) A. Beckman, Bidrag till Kannedomen om Skandiums Spektrum i Yttersta Ultraviolett, Akademisk Avhandling

p. 79 (Almqvist and Wiksells Boktryckeri-A.-B., Uppsala, 1937). (C L) W.-Z. Tsien, Chinese J. Phys. 3, No. 2, 131 (1939). (T) (C L)

B. Edl6n, Phys. Rev. 62, 434 (1942). (T) (C L)

K IV K IV

Config. Desig. J Level Interval Config. Desig. J Level Interval

3s2 3

p

4 3p4 3 P 2

10

0 1673

2324

1673

651

3s2 3p3 (

4 S°)4s

3s2 3p3

(

2 P°)3d

4s 3 S°

3d" iP°

1

1

260352

261445

3s2 3p4 3p4 *D 2 16386 3s2 3p3

(

2 P°)3d 3d" 3 D° 3

2 262831 -828

3s2 3p4 3p4 3 S 0 38548 1 263659

3s 3p5 3p5 3po 2 134181 -1478

-794

3s2 3p3

( 2 P°)3d 3d" iD° 2 273409

1 135659

0 136453 3s2 3p3 (

2 D°)4s 4s' 3 D° 1 277795

2 277851 135

3s 3p5 3p5 2 P° 1 171140 3 277986

3s2 3p3 (

4S°)3d 3d 3 D° 3 189952 -252

-199

3s2 3p3 (

2 D°)4s 4s' iD° 2 282373

2 191204

1 191403 3s2 3p3

(2P°)4s 4s" 3 P° 0 293384 89

3s2 3p3 (

2 D°)3d

1 293473 247

3d' 1F° 3 222420 2 293720

3s2 3p3

(

2 D°)3d 3d' 3P° 2 225445 -645

-1562

3s2 3p3

( 2 P°)4s 4s" 1 P° 1 298134

10226090

227652 3s2 3p3

(

4 S°)5s 5s 3S° 1 367890

3s2 3p3 (

2 D°)3d

3s2 3p3

(

3 P°)3d

3d' ip° 1 235527: 3d" 3 P° 2 256034

257124 -1090

-687

K v ( 4Si*) Limit 491300

10 257811 :

December 1947.
K iv Observed Terms*

Config.

Is 2 2s2 2

p

6 +

Observed Terms

3s2 3p4 { 3p4 *S 3p4 3 P

3p4 4 D

3s 3p

5 {

3p5 3po

3

p

5 4 P

0

ns ( n> 4) nd ( n> 3)

3s2 3p3

(

4 S°)nx 4, 5s 3 S° 3d 3 D°

3s2 3p3

(

2 D°)nx'

{

4s' 3 D°

4s' 4 D°

3d' 3 P°

3d' 4 P° 3d' iF°

3s2 3p3

(

2 P°)na;" {

4s" 3 P°

4s" 4 P°

3d" 3 P°

3d" 4 P°

3d" 3 D°

3d" >D°

*For predicted terms in the spectra of the S i isoelectronic sequence, see Introduction.

K V

(Pi sequence; 15 electrons) Z= 19

Ground state Is2 2s2 2_p

6 3s2 3p3 4S°^

3pz 4S^ cm-1

I. P. volts

The analysis is incomplete. The terms are from the paper by Tsien, who includes those

given earlier by Bowen. Seventy-two lines have been classified in the interval between 294 A

and 825 A.

The relative position of the doublet terms with respect to the quartet terms was esti- mated from the irregular doublet law. Tsien lists combinations of 3p

z 4S° and 3p

3 2P° with

the level labeled “3”, which are not in disagreement with this estimate.

REFERENCES

I. S. Bowen, Phys. Rev. 46, 791 (193#. (T) (C L)

W.—Z. Tsien, Chinese J. Phys. 3, No. 2, 136 (1939). (T) (C L)
235

K V KV

Config. Desig. J Level Interval Config. Desig. J Level Interval

3s2 3

p

3 3p3 4S° IX 0 3s2 3p2

( 3 P)3d 3d 2F 2^2 3/

262487

262874 387

3s2 3p3 3p3 2 D° i X 24000 237 2% 24287 3s2 3p2 (

3 P)3d 3d 2D 2X2 IX

264741

264932 -191

3s2 3

p

3 3p

3 2p° X 89745 319 ix 40064 3 268043

3s 3

p

4 3p4 4P 2% 136639 -1403

-764

4 274375

IX

X

138042

138806 3s2 3p2

(

x D)3d 3d' 2 D IX 281024

2X

3s 3p4 3p4 2 D 1 X

2%

161199

161564 365 3s2 3p2 (

x D)3d 3d' 2P X

1 X 290772

1 169703

3s2 3p2 (

x D)3d 3d' 2F 2y2 292710

2 169886 3X

3s 3p4 3p4 2P VX

X

194792

196319 -1527 3s2 3p2

(

x D)3d 3d' 2S iX 292968

3p4 2S

3s2 3p2

(

xS)3d 3d" 2 D IX 304461

1517

3s 3p4 x 205784 2y2 305978

3s2 3p2

(

3 P)3d 3d 4F i/2 206720 445 5 307717

2/ 207165

3/ 6 310120

4/

3s2 3p2

(

3P)4s 4s 4P X 336628 1017

1527 3s2 3p2

(

3 P)3d 3d 4 D 3/ ix 337645

2/ 222367 -344 2/ 339172

1 X 222711

X 3s2 3p2

( 3P)4s 4s 2 P X

IX

343726

345526 1800

3s2 3p2

(

3 P)3d 3d 4P 2/2 257865 -1411

-450 1/2 259276 3s2 3p2 (

x D)4s 4s' 2D 2X 356993 -40

X 259726 ix 357033

3s2 3p2

(

3 P)3d 3d 2P 1/2 259205 -1663

X 260868

November 1947.

Kv Observed Terms*

Config.

Is2 2s2 2p6 +

Observed Terms

3s2 3p3

3s 3p4

/3p3

S°

\ 3

p

3 2 P° 3p3 2 D°

f 3p4 4 P

\3p4

S 3p4 2 P 3p4

D

ns (n> 4) nd (n> 3)

f 4s 4P 3d 4 P 3d 4 D 3d 4F

3d2 3p2

(

3 P)nx

| 4s 2P 3d 2 P 3d 2 D 3d 2F

3s2 3p2 (

x D)nx' 4s' 2 D 3d' 2S 3d' 2P 3d' 2 D 3d' 2F

3s2 3p2 (

x S)nx" 3d" 2 D

For predicted terms in the P I isoelectronic sequence, see Introduction.
(Si i sequence; 14 electrons) 7= 19

Ground state Is2 2s2 2p

6 3s2 3p2 3P0

3p2 3 P0 804513 cm-1

I. P. 99.7 volts

The analysis is chiefly by Whitford, with singlet terms added from Robinson’s paper.

Twenty-seven lines have been classified in the interval between 256 A and 725 A. Inter- system combinations connecting the singlet and triplet terms have been observed.

Using the method suggested by Edlen for extrapolation along the isoelectronic sequence,

the writer has estimated the value of the limit quoted above and entered in brackets in the

table.

REFERENCES

A. E. Whitford, Phys. Rev. 46, 793 (1934). (T) (C L)

H. A. Robinson, Phys. Rev. 52, 725 (1937). (T) (C L)

KYI KYI

Config. Desig. J Level Interval

3s* 3p2 3p2 3 P 0

12

0

1131

2924

1131

1793

3s2 3p2 3p2 J D 2 18973

3s 3

p

3 3p3 3 D° 1 14074S *>3 2 140796 170

3 140966

3s 3

p

3 3p3 3 P° 2, 1,0 168434

3s 3

p

3 3p

3 3 S° 1 218316

Config. Desig. J Level Interval

3s 3p3 3p3 *P° 1 223840

3s2 3p(2 P°)3d 3d 3 P° 2 252332 -1172

-539 1 253504

0 254043

3s2 3p(2 P°)4s 4s 3 P° 0 387421 693

2379 1 388114

2 390493

K vii (

2 P£) Limit [804513]

October 1947.
K vii

237

(A1 i sequence; 13 electrons) Z=19

Ground state Is2 2s2 2p& 3s2 3p

2P^

Sp 2Py2 950200 cm 1 I. P. 118 volts

Both Whitford and Phillips have worked on the analysis of this spectrum. Thirty lines

have been classified in the interval between 175 A and 671 A. No intersystem combinations

have been observed, but Phillips estimates that 3_p

2 4P^ is approximately 114000cm-1 above

the ground state. This value is entered in brackets in the table. The uncertainty x may

exceed ±1000 cm-1. Using the method suggested by Edlen, the writer has extrapolated the value of the limit

quoted above and entered in brackets in the table. The uncertainty in this estimate is large

owing to the incompleteness of the isoelectronic sequence data.

REFERENCES

A. E. Whitford, Phys. Rev. 46, 793 (1934). (T) (C L)

L. W. Phillips, Phys. Rev. 55, 708 (1939). (T) (C L)

K vii K vii

Config. Desig. J Level Interval Config. Desig. J Level Interval

3s2

(

4 S)3p 3p 2 P° Z 0

3129 3s 3p(3 P°)3d 3d 4 D° z 865092+x 371

315

138

1/2 8129 1/2 865468 +x

2y2 865778+x

3s 3p2 3p2 4 P Z [1 14000] +x 1145

1726

3/2 865916+x

1/2 115145 +x

2/ 116871 +x 3s2 OS) 4s 4s 2 S Z 439297

3s 3

p

2 3p2 2 D 1/2 151882 167 3s 3p(3 P°)4s 4s 4P° z 565814+x 1129

1932 2/ 152049 1 Z

2/2 566443+x

568375+x

3s 3p2 3p2 2 S Z 193079

3s2

(

J S)4d 4d 2 D 1/2 570812 157 3s 3p2 3p2 2 P z 206507 1927 2z 570969

1/2 208434

3s2

(

1 S) 3d 3d 2 D 1/2 2/

1/2

250668

250787 119 K viii OSo) Limit [950200]

3p3 3p3 4 S° 807479 +x

September 1947. K vii Observed Terms*

Config.

Is2 2s2 2p6 +

Observed Terms

3s2 (

1 S)3p 3p 2 P°

3s 3p2 {3p2 2 S

3p2 4 P

3p2

P 3p2D

3P3 3p3 4 S°

ns (n>4) nd {n> 3)

3s2

(

1 S)nr 4s 2S 3, 4d 2 D

3s 3p(3 P°)nx 4s 4P° 3d 4 D°

*For predicted terms in the spectra of the All isoelectronic sequence, see Introduction.
(Mg i sequence; 12 electrons) Z=19

Ground state Is2 2s2 2p

6 3s2 X S0

3s2 XS0 1247000 ± cm-1

I. P. 155 ± volts

Twenty-six lines have been classified in the range between 155 A and 938 A. The triplet

terms are from Parker and Phillips; the singlets from Tsien. By extrapolation along the

sequence Mrs. Beckman has classified a line at 774.738 A as the intersystem combination

3s2 X S0 —3p 3 P°. The listed values of the triplet terms have been adjusted to fit this

assignment.

From isoelectronic sequence data the writer has extrapolated the value of the limit, using

the method suggested by Edlen. This value is entered in brackets in the table. Although

this estimate may be in error by more than ±1000 cm-1

, it gives an approximate value of

the ionization potential.

REFERENCES

A. Beckman, Bidrag till Kdnnedomen om SJcandiums Spektrum i Yttersta Ultraviolett, Akademisk Avhandling

p. 55 (Almqvist and Wiksells Boktryckeri-A.-B., Uppsala, 1937). (C L) W.-Z. Tsien, Chinese J. Phys. 3, No. 2, 142 (1939). (T) (C L)

W. L. Parker and L. W. Phillips, Phys. Rev. 57, 140 (1940). (T) (C L)

K viii K vni

Config. Desig. J Level Interval Config. Desig. J Level Interval

3s2 3s2 iS 0 0 3s(2S)3d 3d 3 D 1 368004 56

72 2 368060

3s(2 S)3p 3p

3 P° 0 127968 1112 3 368132

12 129080

181452 23723s(2S)4s 4s 3 S 1 631654

3s ( 2 S) Zp 3p 1P° 1 192540. 2 3s(2 S)4d 4d 3 D 1 770165 95

141 2 770260

3s(2 S)3d 3d *D 2 299117. 4 3 770401

3p

2 3p2 3 P 0 304669 3s(2S)4/ 4/ 3 F° 2, 3,4 801511

12 306035

308608 2573

K ix (

2 S„) Limit [1247000 ±J

March 1948.
K IX 239

(Na i sequence; 11 electrons) Z=19

Ground state Is2 2s2 2_p

6 3s 2Sy

3s 2Sy3 1419425 cm"1 I. P. 175.94 volts

All but two of the terms are from the paper by Kruger and Phillips, who extended the

earlier work by Edlen and Whitford. Absolute term values are based on three members of

the 2D-series. The two terms 5s 2S and 5g 2G have been added from the paper by Tsien, but adjusted

to agree with the term array by Kruger and Phillips.

Twenty-five lines have been classified, in the range from 112 A to 636 A.

REFERENCES

W.-Z. Tsien, Chinese J. Phys. 3, No. 2, 145 (1939). (T) (C L)

P. G. Kruger and L. W. Phillips, Phys. Rev. 55, 352 (1939). (I P) (T) (C L)

K IX K IX

Config. Desig. J Level Interval Config. Desig. J Level Interval

3s 3s 2 S K 0 5s 5s 2 S X 979901

3P 3p

2 P° X 157159 3766 50 50 2 G 4y2 1044250 -48

i X 160925 sy2 1044298

3d 3d 2 D iy2 374788 292 5d 5d 2 D iy2 1049114 60

2y2 375080 2/4 1049174

4s 4s 2 S Vi 698902 5/ 5/ 2 F° 2y2 3/2 1061120

1061172 52

4p 4p

2 P° X

iy2

1 X

2y2

758174

759615 1441

4

d

4d 2 D 836703 158 K x OSo) Limit 1419425

836861

4/ 4f

2 F° 2% 860768 79

3}'2 860842

June 1947. KX

(Ne i sequence; 10 electrons) Z=19

Ground state Is2 2s2 2p

6

2p

6 X S0 4064300 cm-1

I. P. 503.8 volts

Eleven lines between 29 A and 41 A have been classified by Edlen and Tyren as combinations with the ground term. Their absolute term values have been extrapolated along

the Ne i isoelectronic sequence.

By analogy with Ne i, ^7-coupling notation in the general form suggested by Racah is introduced.

The unit adopted by Edlen and Tyren, 103 cm-1

, has here been changed to cm-1

. REFERENCES

B. Edl6n and F. Tyr6n, Zeit. Phys. 101, 206 (1936). (I P) (T) (C L) G. Racah, Phys. Rev. 61, 537 (L) (1942).
240

Kx

Authors Config. Desig. j Level

2p 'So 2s2 2p6 2 0 0

2s2 2p5 (

2 P|^)3s 3s [1 y2]° 2

3s *Pi 1 2407800

2s2 2pB

( 2P£)3s 3s'

[ y2]° 0

3s !Pi 1 2480800

2s2 2pB

(

2 Pfo)3d 3d [ y2]° 0

3d *Pi 1 2760200

3d !Pi tt t-H o

"e CO 1 2794900

3d 3 Dj 2s2 2pB

(

2 P£) 3d 3d' [i y2]° 1 2832300

2s2 2p5

( 2 Pf^)4s 4s [i y2 ]° 2 4s »Pi 1 3205100

2s2 2pB (

2 P£)4s 4s'

[ y2]° 0

4s J Pi 1 3232400

April 1947.

KX

Authors Config. Desig. J Level

2s 2p6 (

2 S)3p CO o 2

3p' 3 Pj 1 3219400

0

3V' 'Pi 2s 2p6

(

2 S)3p 3p 1 P° 1 8287600

4d iPj 2s2 2pB

( 2 Pf^)4d 4d [1 y2]° 1 8856400

4d 3 Dj 2s2 2pB

( 2 P£)4d 4d' [i y2]° 1 3879700

K xi (

2 Pf*)

K xi (

2 P£)

Limit

Limit — 4064300

4087775

K x Observed Levels*

Config.

ls2 +

Observed Terms

2s2 2p6 2 iS

ns (n> 3) np(n> 3) nd (n> 3)

2s2 2p5

( 2 I

>0)nx / 3, 4s 3 P°

l 3, 4s bP 0 3d 3 P° 3, 4d 3 D°

3, 4d JP°

2s 2p6

( 2 S)nx

{

3p

3 P°

3p

iP°

j7-Coupling Notation

Observed Pairs

ns (n> 3) nd (n> 3)

2s2 2p5

(

2 Pi^)nx 3, 4s [1 y2 ]° 3d [ y2]° 3, 4d [1 y2]°

2s2 2pB (

2 P£)nz' 3, 4s' [ y2]° 3, 4d'[lH]°

*For predicted levels in the spectra of the Ne i isoelectronic sequence, see Introduction.
241

K XI

(F i sequence; 9 electrons) Z=19

Ground state Is2 2s2 2_p

5 2P

2p

5 2P°iy3 cm-1

I. P. volts

Edlen and Tyren have classified 8 lines, which lie between 32 A and 37 A. They give no

term array because the analysis is so incomplete. In the 1942 reference Edlen states that

the interval of the ground term is known from his unpublished material to be 23475 cm-1

. From these data, preliminary term values have been calculated and fisted below.

REFERENCES

B. Edl4n and F. Tyr4n, Zeit. Phys. 101, 206 (1936). (C L)

B. Edl4n, Zeit. Astroph. 22, 59 (1942). (T)

K xi

Edl6n Config. Desig. J Level Inter- val

2v

2 P2 2s2 2p

5 2p5 2p° l/2 0

2 -23475

Pi X 28475

3s 4 P3 2s2 2p4 ( 3 P) 3s 3s 4 P 2)4 2640600?

4 -12200

p2 1 X 2652800?

)4 3s 2 P2 2s2 2p4

( 3 P)3s 3s 2 P 1)4 2671300?

y2

3s' 2 D3 2s2 2p4 (

4 D)3s 3s' 2 D 2>4 2727600?

2 -700 d2 i/2 2728300?

3d 2s2 2p4

(

3 P)3d 3d X 3047900?

3d 2s2 2p4

(

4 D)3d CO a, X 3107500?

March 1947.
CALCIUM

Cal

20 electrons Z=20

Ground state Is2 2s

2 2

p

6 3s2 3

p

6 4s2 ^

4s2 1S0 49304.80 cm-1

I. P. 6.111 volts

The arc spectrum of calcium occupies an important place in the development of spectroscopic theory. In addition to the “regular” series, the terms involving two excited electrons were first discussed in the classical paper by Russell and Saunders in 1925.

Although the spectrum is well known, further observations in the infrared are urgently

needed; and a monograph containing a homogeneous list of lines and term values should

be prepared as soon as the analysis can be extended with the aid of these data.

The regular series terms, i. e., those from the 2S limit in Ca n, are from Fowler and

Paschen-Gotze. The rest are from Russell and Saunders and from unpublished analysis by

Russell, who has generously furnished all of his data on this spectrum. The 6/ 3 F° term

has been resolved by Grafenberger. Three-place entries in the table are quoted from Wagman,

who derived them kom observations made with the interferometer. The writer has prepared

a complete multiplet array and calculated all other values from the best available wavelength

material. Colons indicate that the term values should be confirmed by further observations.

The singlet and triplet terms are connected by observed intersystem combinations.

REFERENCES

F. Paschen und R. Gotze, Seriengesetze der Linienspektren, p. 72 (Julius Springer, Berlin, 1922). (I P) (T)

(CL)

A. Fowler, Report on Series in Line Spectra, p. 121 (Fleetway Press, London, 1922). (I P) (T) (C L)

H. N. Russell and F. A. Saunders, Astroph. J. 61, 38 (1925). (I P) (T) (C L)

E. Back, Zeit. Phys. 33, 579 (1925). (Z E) H. N. Russell, unpublished material (1927?). (T) (C L)

A. G. Shenstone and H. N. Russell, Phys. Rev. 39, 417 (1932). (T)

W. F. Meggers, Bur. Std. J. Research 10, 676, RP558 (1933). (I P) (T) (C L) N. E. Wagman, Univ. Pittsburgh Bui. 34, 1 (1937). (T) (C L) H. Grafenberger, Ann. der Phys. [5] 30, 267 (1937). (C L)
Ca I Ca I

Config. Desig. J Level Interval Obs. g Config. Desig. J Level Interval Obs. g

4s2 4s2 *S 0 0. 000 4s(2 S)4/ 4/ !F° 3 42848. 554

4s(2 S)4p 4p

3 P° 0 15157. 910 52 157 4s(2 S)6p 6p

3 P° 0 42514- 79:

3. 93

7. 81 12

15210. 067

15815. 948 105. 881 12

42518. 72

42526. 528

4s(2 S)3d 3d 3 D 1 20335. 344

13 903 0. 501 4s(2 S)5d 5d 3 D 1 42743. 058

1. 718

2. 667 2 20349. 24721. 740 1. 162 2 42744. 776

3 20370. 987 1. 329 3 42747. 443

4s ( 2 S) 3d 3d »D 2 21849. 610 1. 007 4s(2 S)5d 5d !D 2 42919. 074

4s(2 S)4p 4p iP° 1 28652. 824 4s(2 S)6p 6p iP° 1 43933. 841

4s(2 S)5s 5s 3S 1 31539. 510 4s(2S)7s 7s 3 S 1 43980. 798

4s(2 S)5s 5s iS 0 33317. 25 4s(2 S)7s 7s iS 0 44276. 638

3d(2 D)4p 4p' 3 F° 2 35780. 450 88 9R9 0. 754 4s(2 S)5/ 5/ 3 F° 2 44762. 620 0 202

3 85818. 712

78. 178 1. 076 3 44^62. 822

0. 279

4 35896. 890 1. 245 4 44768. 101

3d(2 D)4p 4p' J D° 2 85835. 400 0. 893 4s(2 S)5/ 5/ !F° 3 44804. 786

4s(2S)5p 5p 3 P° 0 86547. 671

7. 051

20. 410

4s(2 S) 7p 7v

3 P° 0

1 86554- 722 1 44957. 8

3. 8

2 36575. 132 2 44961. 6

3d(2 D)4p 4p' 1 P° 1 86731. 622 4s(2 S)6d 6d J D 2 44989. 882

4s(2 S)4d 4d *D 2 37298. 312 4s(2 S)6d 6d 3 D 1 45049. 066

1 340

2 45050. 406

1. 953

4s(2 S)4d 4d 3 D 1 37748. 192

3. 682

5. 578

3 45052. 359

2 37751. 884

3 37757. 462 4s(2S)7p 7p iP° 1 45425. 283

3d(2 D)4p 4p' 3 D° 1 88192. 378 26 721 4s(2 S)8s 8s 3 S 1 45738. 732

2

3 88219. 094

38259. 102 40. 008

4s(2S)8s 8s iS 0 45887. 31 4p2 4p2 3 P 0 38417. 585

47. 259

86. 744

4s(2 S)6/ 6/ 3 F° 2 46164- 66 0 14

1 38464. 844 3 46164- 80 0! 19

2 38551. 588 4 46164. 99

3d(2 D)4p 4p' 3 P° 0 39388. 871

1. 945

4. 762

4s(2 S)6/ 6f »F° 3 46182. 23

1 89885. 816

2 89340. 078 4s(2 S)7d 7d

3 D 1 46302. 18

1. 74

2. 25 2 46303. 92

4s (

2 S) 6s 6s 3 S 1 40474. 275 3 46306. 170

3d(2 D)4p 4p' !F° 3 40587. 860 4s(2 S)7d 7d !D 2 46309. 9 4p2 4p2 J S 0 40690. 436 4s(2 S)8p 8p iP0 1 46479. 95

4p2 4p2 J D 2 40719. 867 4s(2 S)9s 9s 3 S 1 46748. 21

4s(2S)5p 5p »P° 1 41678. 997 4s(2 S)9s 9s iS 0 46835. 2

4s (

2S) 6s 6s iS 0 41786. 312 4s(2 S)7f 7/ 3 F° 2, 3,4 47006. 11

4s(2S)4

/

4/ 3F° 2 42170. 188 n 348 4s(2 S)7/ 7/ !F° 3 47015. 187

3 42170. 581

0. 475

4 42171. 006
244

Ca I—Continued Ca I—Continued

Config. Desig. J Level Interval Obs. g Config. Desig. J Level Interval

4s(2S)8d 8d 3D 1 47036. 32 a

4s(2S)12/ 12/ 3 F° 2, 3,4

2 47040. 00

5. 38 3 47045. 384 4s(2S)13d 13d 3 D 1, 2,3 48570. 7

4s (

2S) 9p 9pX P° 1 47184. 26 4s(2 S)13/ 13/ 3 F° 2, 3,4 *

4s(2S)10s 10s 3S 1 47382. 10 4s(2 S) 14d 14d 3 D 1, 2,3 48676. 6

4s(2S)10s 10s iS 0 47436. 9 4s(2S)15d 15d 3 D 1, 2,3 48762. 4

3d(2D)5s 5s' 3 D 1 47456. 1 9. 8

9. 8

4s(2 S)16d 16d 3 D 1, 2,3 48830. 7

2 47465. 9

3 47475. 7 Ca 11 (

2 S^)

3d(2 D)5p

Limit 49304. 80

4s(2S)8/ 8/ 3 F° 2, 3,4 47550. 11 5p' 3 F° 2 51285. 2:

24. 3

59. 2

3 51259. 5: 4s(2 S)8/ 8/ 'F° 3 47554- 97 4 51318. 7:

4s(2 S)10p lOp 1 P° 1 47660. 8 3d(2 D)4d 4d' 3 D 1 51351. 1 18. 5

25. 9

2 51369. 6

4s(2S)9d 9d 3 D 1 47753. 3

4. 2

8. 0

3 51395. 5

2 47757. 5

3 47765. 5 3d(2 D)4d 4d' 3 G 3 51553. 6: 25. 4

31. 5 4 51579. 0: 4s(2 S)lls 11s 3 S 1 47805. 85 5 51611. 5:

4s(2S)lls 11s *S 0 47843. 1 3d(2 D)4d 4d' 3S 1 51571. 4

4s(2 S)9/ 9/ 3 F° 2, 3,4 47922.2 3d(2 D)5p 5

p' 3 D° 1 51710. 9

23. 1 32. 5 2 51734- 0

4s(2 S)9/ 9/ iF° 3 47924. 9 3 51766. 5

4s(2S)llp lip ip° 1 47998. 6 3d(2 D)4d 4d' 3F 2 53214. 6

33. 3

12. 5 3 53247. 9

4s(2 S)10d lOd 3 D 1 48032. 0 1 ^ 4 53260. 4

2 48033. 5

2. 7

3 48036. 2 3d(2 D)4d 4d' 3P 0 54282. 2

5. 8

16. 2

1 54288. 0

4s(2S)12s 12s 3S 1 48103. 89 2 54304. 2

4s(2 S)12s 12s »S 0 48128. 2 3d(2 D)5d 5d' 3 D 1 56444. 8

24. 3

25. 6 2 56469. 1 4s(2S)10/ 10/ 3 F° 2, 3, 4 48186. 61 3 56494. 7

4s(2 S)10/ 10/ iF° 3 48188. 3 3d(2 D)5d 5d' 3 G 3 56526. 3:

20. 3

31. 6 4 56546. 6: 4s(2 S) 12p 12p ip° 1 48222. 9 5 56578. 2:

4s(2 S) lid lid 3 D 1, 2,3 48259. 2 3d(2 D)5d 5d' 3 S 1 56558. 8

4s(2 S)13s 13s 3 S 1 48320. 4 3d(2 D)5d 5d' 3 F 2 56900. 7:

23. 4

55. 4

3 56924. 1: 4s(2 S)ll/ 11/ 3 F° 2, 3, 4 48882. 90 4 56979. 5:

4s(2S)ll/ 11/ !F° 3 48385. 5 3d(2 D)5d 5d' 3 P 0 57601. 0

16. 8

20. 4

1 57617. 8

4s(2 S)13p 13p ip° 1 48416. 0 2 57638. 2

4s(2 S) 12d 12d 3 D 1, 2,3 48434. 8 3d(2 D)6d 6d' 3 P 0

1 59366. 8:

25. 2

4s(2 S)14s 14s 3S 1 48484. 7 2 59392. 0: 3d2 3d2 3 P 0

12

48524. 130

48537. 673

48563. 630

13. 543

25. 957

May 1948.
245

Ca i Observed Terms*

Config.

Is2 2s2 2

p

6 3s2 3p6 +

Observed Terms

4s2 4s2 J S

3d2 3d2 3 P

4p2

{ 4p2 *S 4p2 3 P

4p2

ns (n > 5) np (n> 4)

4s(2S)nx

/5-14s 3 S \5-12s *S 4_ 7v

spo 4-13p iP°

3d(2 T>)nx' {

5s' 3 D

0

o 4, 5p' 3 D°

4p' >D° o

o

nd (n> 3) nf (n> 4)

4s(2 S)na; {

3-16d 3 D

3- Id !D

4-13/ 3F°

4-11/ iF° 3d(?D)nx' 4, 5d' 3 S 4-6d' 3 P 4, 5d' 3 D 4, 5d' 3 F 4, 5d' 3 G

*For predicted terms in the spectra of the Ca i isoelectronic sequence, see Introduction.

Ca II

(K i sequence; 19 electrons) Z=20

Ground state Is2 2s2 2p

e 3s2 3p6 4s 2S^

4s 2S^ 95748.0 cm"1 I. P. 11.87 volts

The analysis is chiefly from the paper by Saunders and Russell, who extended the earlier

work on this spectrum. Their estimated value of 5g 2 G is entered in brackets. The terms

nd 2D (n=ll to 16) and nj 2F° (n=8 to 10) have been added from an unpublished manuscript by Shenstone who made additional observations in the region between 2897 A and

3758 A. Shenstone has also generously furnished his recent unpublished observations of the

pair of lines at 8927.34 A and 8912.10 A, having intensities 20 and 15, respectively, and classified as 4d

2D—4/2F°. These lines have been used to calculate the value of 4/ 2F° fisted in

the table.

The three-place entries are quoted from Wagman’s paper. They are derived from his

observations made with the interferometer. The writer has made shght adjustments in the

rest of the term values in order to fit the various sets of observations together.

A monograph on this spectrum is needed.

REFERENCES

F. A. Saunders and H. N. Russell, Astroph. J. 62, 1 (1925). (I P) (T) (C L) H. E. White, Introduction to Atomic Spectra, p. 97 (McGraw-Hill Book Co., Inc., New York, N. Y., 1934).

(E D)

N. E. Wagman, Univ. Pittsburgh Bpl. 34, 1 (1937). (T) (C L)

A. G. Shenstone, unpublished material (1930, 1946). (T) (C L)
246

Ca n Ca n

Config. Desig. J Level Interval Config. Desig. J Level Interval

3p6 ( x S)4s 4s 2 S X 0. 00

3p6 ( x S) 7g 7g 2 G f 3/ l 4/ } 86780. 9 3p0 ( xS)3d 3d 2 D 1/ 13650. 212

60. 689 2/2 13710. 901 3p 6 ( 1 S) 8d 8d 2 D 1 H

2/2 87674. 0

87675. 7 1.7

3p6 ( x S)4p 4p 2 P°

l/2 25191. 541

254H- 427

222. 886

3p6 ( xS)8/ 8/ 2F° } 88847. 6 J 2/ l 3/

3p0 ( x S)5s 5s 2S K 52166. 982

3p«(

x S)4d 4d 2 D l/2 2/

56839. 309

56858. 511 19. 202

3p6 ( 1 S) 8<7 8g 2 G / 3/ l 4/2 } 88883. 8

3p0 ( xS)9d 9d 2 D 1 X 89489. 8 1.0

3p0 ( x S)5p 5p 2P° 60585. 0

78. 2 2/ 89490. 8 I /2 / 2/2 l 3/2

60613. 2 1 3p 0 ( 1 S)9/ 9/ 2F° / 2/ t 3/ ) 90800. 0

3p6 ( x S)4/ 4/ 2 F° } 68056. 96 J

3p0 ( x S)6s 6s 2 S 70677. 61 3p 0 ( 1S)9gf 9g 2 G / 3/ l 4/ }

90326.4

3p0 ( xS)5d 5d 2 D 1/2 72722. 11

8. 66 3p6 ( 1 S) lOd lOd 2 D 1 X 90755. 3

0. 8 2/ 72730. 77 2/ 90756. 1 3p6 ( x S)6p 6p 2 P° I /2 74485. 8

74521. 7

35. 9 3p6 ( x S) 10/ 10/ 2 F° J 2/ l 3/2 }

91888.0

3p6 ( 1 S)5/ 5/ 2 F° r 2/ 1 3/ }

78027.8 3p6 ( x S)lld lid 2 D ; ix 1 2/ } 91674. 0

3p8 ( 1S)5^ 5g 2 G / 3/ l 4/2 } [78163] 3p6 ( x S)12d 12d 2 D J IX 1 2/ } 92360. 9

3p9 ( x S)7s 7s 2 S 79449. 9

3p6 ( x S) 13d 13d 2 D r ix l 2/2 } 92885. 0

3p6 ( 1 S) 6d 6d 2 D 1/2 80523. 47

4. 59 2/ 80528. 06

3p6 ( xS)14d 14d 2 D J ix l 2/2 } 93299. 6 3p6 ( x S)6/ 6/ 2 F° J 2/ l 3/ } 88458. 4 3p6 ( xS)15d 15d 2 D / ix t 2/ } 93628. 8 3p6 ( x S)6*7 6g 2 G J 3/ l 4/ }

83540.0

3p0 ( x S)16d 16d 2 D / 1 X l 2/2 } 93896. 4 3p0 ( x S)8s 8s 2 S X 84302. 6 3p9 ( x S)7d 7d 2 D i/2 2/ J 2/ 1 3/

84935. 4

84938. 3

2. 9 Ca hi ( XS0) Limit 95748.0

3p6 ( x S)7/ 2JP° }

86727.5

May 1948.
247

Cam

(A i sequence; 18 electrons) Z=20

Ground state Is2 2s2 3s2 3p6 X S0

3

p

6 'S0 413127 cm-1

I. P. 51.21 volts

This spectrum is incompletely analyzed. The present list has been compiled from the

paper by Bowen, who has classified 137 lines in the region between 403 A and 4081 A.

The Paschen notation as given by Bowen is entered in column one of the table, under the

heading “A i”. Bowen remarks, however, that these assignments are in many cases doubtful

for levels having the 3d configuration. The writer has, nevertheless, adopted them tentatively in order to introduce the ^-coupling notation in the general form suggested by Racah,

as in the case of all spectra like Ai. The pairs nd[3%]° and nd[ 1%]° are partially inverted as compared with Ne i. The Z^-designations ns 3 P°0 'P° can probably be safely assigned to the levels ns5, 7is4, ns3) ns2 , respectively.

REFERENCE

I. S. Bowen, Phys. Rev. 31, 499 (1928). (I P) (T) (C L)

Ca m Ca hi

A i Bowen Config. Desig. j Level A 1 Bowen Config. Desig. J Level

lpo 3P 3p6 3p 6 *S 0 0. 0 2p5 4p5 3p5 (

2Pi^)4p 4p [ %] 0 282072

2p4 4p4 3p5 (

2 P^)4p 4p' [i y2] 1 281136. 3 3pK2 Pw)3d 3d [ y2 ]° 0 2p3 4p3 2 281878. 8

3d6 3D! 1 203845. 1 2p2 4p2 // 4p' [ y2] 1 282568. 4

// 3d [3%]° 4 0 3D3 3 213378. 3

3d3 3D2 // 3d [1 y2]° 2 204835. 4 3p5(2 Pi*)4d 4d [ y2 ]° 0 3d2 3D6 1 224552. 4 4d5 4D! 1 322998. 9

3d" 3D4 // 3d [2 y2 ]° 2 214332. 3 n 4d [3 y2 y 4

3 4di 4D3 3 326182

3s'/" 3D6 3p5

(

2 P£)3cZ 3d' [2%]° 2 225823. 2 4d3 4D2 ft 4d [1 y2]° 2 323650. 6

3si" 3D8 3 228411. 6 1 3s" 3D7 n 3d' [1 y2y 2 227387. 8 M" 4D4 tt ±d [ 2y2 ]° 2 328086. 5

3si 3D# 1 232831. 4 3 3p5 (2 PA)4d ±d' [2y2]° 2

ls5 4s5 3p5

(

2 Pfo)4s 4s [iy2]° 2 242543. 5 4Sr 4Ds 3 335285. 9

ls4 4s4 1 243927. 0

1S3 4s3 3p5

(

2 P£)4s 4s' [ y2]° 0 245608. 4 2s5 5s5 3p5

( 2 Pij^)5s 5s [1H]° 2 327917

ls2 4s2 1 247693. 4 2s4 5s4 1 328580. 4

2s3 5s3 3p5

(

2 P^)5s 5s' [ y2 ]° 0 331042. 7

2pio 4pio 3p«(2PiH)4p 4p [ y2] 1 272185. 4 2s2 5s2 1 331398. 6

2p9 4p9 // 4V [2K1 3 277018. 8

2p8 4p8 2 277377. 5 Ca iv (

2P!m) Limit 413127

2p7 4p7 // 4P [i y2] 1 278616. 7

2p# 4p« 2 279738. 2 Ca iv (

2 P£) Limit 416261

May 1948.
Ca hi Observed Levels*

Config.

Is2 2s2 2p 6 3s2 +

Observed Terms

3p

6 3

p

6 *S

ns (n> 4)

3p 5 (

2 P°)nx / 4, 5s 3 P°

\ 4, 5s ip°

jZ-Coupling Notation

Observed Levels

ns (n > 4) np (n> 4) nd (n> 3)

Zp5 (?Vlx)nx 4, 5s [iy2]° 4P [ HI

4p [234] 4p [ i yA

3, 4d [ y2y

3, 4d [3V2]° 3, 4d [134]°

3, 4d [234]° 3p5

(

2 P£)wz' 4, 5s'[ y2 ]° ip'im

4p'[ y2 ]

3, 4d'[2y2 ]° 3d'[iy2y

*For predicted levels in the spectra of the Ai isoelectronic sequence, see Introduction.

Ca iv

(Cl i sequence; 17 electrons) Z=20

Ground state Is2 2s2 2

p

6 3s2 3p

5 2Pij^

3p5 2Pi 542000 cm-1

I. P. 67 volts

Various investigators disagree about the interpretation of this spectrum. Tsien has published 34 classified fines in the region between 249 A and 669 A, all but one of which are due

to combinations from the ground term. His terms are listed except for 4s 4P, 4s 2P, and

4s' 2D, which are from the paper by Kruger and Phillips. Further study of this spectrum is desirable to confirm the present analysis.

The limit (entered in brackets in the table) is from Edlen, who has estimated it by extra- polation along the isoelectronic sequence.

REFERENCES

I. S. Bowen, Phys. Rev. 31, 498 (1928). (C L) B. Edl6n, Zeit. Phys. 104, 410 (1947). (I P)

P. G. Kruger and L. W. Phillips, Phys. Rev. 51, 1087 (1937). (T) (C L)

W.-Z. Tsien, Chinese J. Phys. 3, No. 2, 118 (1939). (T) (C L)
Ca IV Ca IV

249

Config. Desig. J Level Interval Config. Desig. J Level Interval

3s2 3p5 3p

5 2p° iy

y2 0

8115 -3115 3s2 3p4

(3P)4s 4s 2P iy

y2 298175

300249 -2074

3s 3p6 3p

6 2S y2 152430 3s2 3p4

(

x D)3d 3d' 2 D 2/2

v/2 303591

3s2 3p4

(3 P)3d 3d 4F 4y2 3/2 3s2 3p4

(

x D)3d 3d' 2 S y 303844

2)4

1/2 221944 3s2 3p4 (

x D)4s 4s' 2 D iy

2/2 314079

314373 294

3s2 3p4

(

3P)3d 3d 4D 3H

2K2 227427 -400

-864

3s2 3p4

(

3 P) 4p 4p

2P° 1/2 829277

I /2y2 227827

228691

3s2 3p4

(

x S)4s

y2 4s" 2 S y 337207

3s2 3p4

( 3P)3d 3d 2D iy2 228429 1684 2/2 230113 3s2 3p4 (

x D)5s 5s' 2 D 2H

1/2 399755

400949 -1194

3s2 3p4

(

3 P) 3d 3d 2F 3/2 2k

2/2 iy2 y2

266840

3s2 3p4

( 3 P)4s 4s 4P 291373 -1638

-1280

Ca v (3p* 3 P2) Limit [542000]

I

293011

294291

March 1948. Ca iv Observed Terms*

Config.

Is 2 2s2 2

p

6 Observed Terms

3s2 3p5 3p

s 2p°

3s 3p

6 3p6 2 S

ns (n> 4) np (n>4) nd (n> 3)

/ 4s 4P 3d 4 D 3d 4 F

3s2 3p4

( 3 P)nx

\ 4s 2P 4p

2P° 3d 2 D 3d 2F

3s2 4, 5s' 2 D 3d' 2S 3d" 2 D

3s2 3p4 (

x S)ru:" 4s" 2 S

*For predicted terms in the spectra of the Cl i isoelectronic sequence, see Introduction.

Ca V

(S i sequence; 16 electrons) Z=20

Ground state Is2 2s2 2

p

6 3s2 3p4 3P2

3p* 3 P2 680800 cm"1 I. P. 84.39 volts

The terms are from the papers by Bowen and by Tsien with the revised value of 3p

5 1 P°

suggested by Edlen.

More than 70 lines have been classified in the interval 184 A to 656 A. Intersystem

combinations connecting the singlet and triplet terms have been observed.

REFERENCES

M. Ram, Indian J. Phys. 8, 167 (1933). (T) (C L)

I. S. Bowen, Phys. Rev. 46, 791 (1934). (T) (C L)

B. Edl6n, Zeit. Phys. 104, 192 (1937). (I P)

W.-Z. Tsien, Chinese J. Phys. 3, No. 2, 131 (1939). (T) (C L)

B. Edl6n, Phys. Rev. 62, 434 (1942). (T) (C L)
250

Ca v Ca V

Config. Desig. J Level Interval Config. Desig. J Level Interval

3s2 3

p

4 3p4 3 P 2 0 2404 3s2 3p3

( 2 D°)4s 4s' 3 D° 1 369590

106

263

10

2404

3276 -872 2

3 369696

869959

3s2 3p4 3p4 *D 2 18831 3s2 3p3

( 2 D°)4s 4s' 1 D° 2 374728

3s2 3p4 3p 4 »S 0 43847 3s2 3p3

(

2 P°)4s 4s" 3 P° 0 887039

187

426 1 887226

3s 3p5 3p5 3po 2 154664 9flQ9 2 887652

10 156756

157897 -1141

3s2 3p3

(

2 P°)4s 4s" 4 P° 1 892283

3s 3

p

5 3p5 4 P° 1 197849 3s2 3p3

(

4 S°)5s 5s 3 S° 1 501127

3s2 3p3

( 2 D°)3d 3d' 4 F° 3 254125 3s2 3p3 (

2 D°)5s 5s' 3 D° 1 524651 119

283 2 524770

3s2 3p3

( 2 P°)3d 3d" 3 P° 2 298204 -1331 3 525053

1 299585

0 3s2 3p3

( 2 D°)5s 5s' 1 D° 2 526523

3s2 3p3

(

2 P°)3d 3d" 4 P° 1 802184 3s2 3p3

(

2 P°)5s 5s" 3 P° 0

1 542249 401

3s2 3p3

(

2 P°)3d 3d" 3 D° 3 2 542650

2 809884 -1111

1 810945 3s2 3p3

(

2 P°)5s 5s" 1 P° 1 544143

3s2 3p3

( 2 P°)3d

3s2 3p3

(

4S°)4s

3d" 'D° 2 829230

4s 3 S° 1 350914 Ca vi (

4 Sj^) Limit 680800

December 1947. Ca v Observed Terms*

Config.

Is 2 2s2 2p6 -b Observed Terms

3s2 3p4 { 3p4

S

3p4 3 P

3p4 *D

3s 3p5 {

3p5 3 p°

3p5 4 P°

ns (n> 4) nd (n> 3)

3s2 3p3

(

4 S°)nx 4, 5s 3S°

3s2 3p3

(

2 D°)nx'

{

4, 5s' 3 D°

4, 5s' >D° 3d' IF0

3s2 3p3 (

2 P°)nx"

{

4, 5s" 3 P°

4, 5s" 4 P°

O

O

CO

CO 3d" 3 D°

3d" 4 D°

*For predicted terms in the spectra of the S i isoelectronic sequence, see Introduction.
~251

Ca Vi

(P i sequence; 15 electrons) Z=20

Ground state Is2 2s2 2p

6 3s

2 4S°^

3p

3 4S°^ cm-1

I. P. volts

The terms are from the paper by Tsien, who includes those given earlier by Bowen.

Fifty-three hnes have been classified in the interval between 228 A and 766 A. For the

term 3_p

4 2P the value given by Mrs. Beckman is quoted in place of that by Tsien.

The relative positions of the doublet and quartet systems of terms were estimated from

the irregular doublet law. No intersystem combinations have been observed, as indicated by

the uncertainty x in the table and the brackets around 3jp

3 2Di^.

REFERENCES

I. S. Bowen, Phys. Rev. 46, 791 (1934). (T) (C L)

A. Beckman, Bidrag till Kannedomen om Skandiums Spektrum i Yttersta Ultraviolett, Akademisk Avhandling

p. 74 (Almqvist and Wiksells Boktryckeri -A.-B., Uppsala, 1937). (C L)

W.-Z. Tsien, Chinese J. Phys. 3, No. 2, 136 (1939). (T) (C L)

Ca VI Ca VI

Config. Desig. J Level Interval Config. Desig. J Level Interval

3s2 3p3 3p

3 4 S° 1/2 0 3 303651 +2

3s2 3p

3 3p3 2 D° 1/ [27000]+

417 3s2 3p2

(

1 D)3d 3d' 2 S z 320397+2

2/z

27417+x

3s2 3p2

(

4 D)3d 3d' 2 D 2Z 321084+2 -500

3s2 3p3 CO 0 U754+X 556 iz 321584+2

1/ 45810+x

3s2 3p2 0D)3d 3d' 2P z 332138+2 1354

3s 3p4 3

p

4 4 P 2/ 155792 -1983

-1058

iz 333492+2

1/2z

157775

158833 3s2 3p2 0S)3d 3d" 2 D iz

2Z

360821+2

1 (

2 D) 2

175758+2 -399

2 1Z 176157+2 3s2 3p2 (

3 P) 3d 3d 2 D 2/2 iz 383743+2

3s 3p4 3p

4 2 D 1Z 193412+2 201 2/ 193613+2 3s2 3p2

(

3 P)4s 4s 4P z 433849 1437

2106 IZ 435286

3s 3p4 3p

i 2 P izz

223170+2 2/2 437392

3s2 3p2 (

3 P)4s 4s 2P z 442423 +2 2467

3s 3

p

4 3

p

4 2S z 231318+2 IZ 444890+2

3s2 3p2

(

3 P) 3d 3d 2 F 2Z 291165+2 3s2 3p2 (

J D)4s 4s' 2 D 2Z 457458+2 -67

3/2 1/2 457525+2

3s2 3p2

(

3 P) 3d 3d 2 P IZ 294798+2 -2452 z 297250+2

November 1947.
252

Ca vi Observed Terms*

Config.

Is 2 2s2 2p6 +

Observed Terms

3s2 3p3 |3p

3 4 S°

3p3 2P° 3p

3 2 D°

3s 3p

i \3p4 2 S 3p4 4 P

3p

i 2 P 3p* 2 D

ns (w> 4) nd (n> 3)

3s2 3p2

(

3 P)nx

{ 4s 4 P

4s 2 P 36/ 2P 3d 2 D 3d 2 F

3s2 3p2 (

1 T))nx' 4s' 2 D 3d' 2 S 3d' 2 P 3d' 2 D

3s2 3p2 0S)nz" 3d" 2 D

*For predicted terms in the spectra of the Pi isoelectronic sequence, see Introduction.

Ca VII

(Si i sequence; 14 electrons) Z=20

Ground state Is2 2s2 2_p

6 3s2 3p

2 3P0

3p

2 3 P0 1030000 cm"1 I. P. 128 volts

The terms are from the paper by Phillips, who includes those found by Whitford and by

Robinson. In the interval between 202 A and 640 A, 33 lines have been classified in all. Intersystem combinations connecting the singlet and triplet terms have been observed.

The limit entered in brackets in the table has been estimated by Phillips.

REFERENCES

A. E. Whitford, Phys. Rev. 46, 793 (1934). (T) (C L)

H. A. Robinson, Phys. Rev. 52, 725 (1937). (T) (C L)

L. W. Phillips, Phys. Rev. 55, 708 (1939). (I P) (T) (C L)

Ca vii Ca vii

Config. Desig. J Level Interval Config. Desig. J Level Interval

3s2 3p

2 3p

2 3 P 0 0 1627 3s2 3p(2 P°)3d 3d 3 P° 2 286232 1 Q37

12 1627

4070 2443 10

288169

289011 -842

3s2 3p2 3p2 4 D 2 21870 3s2 3p(2P°)3d 3d 3 D° 1 302663 488

198 2 303151

3s 3p3 3p3 3 D° 1 160160 68

299

3 303349

2 160228

3 160527 3s2 3p(2 P°)4s 4s 3P° 0 490012 Q06

1 490918 3346

3s 3p3 3p

3 3po

2, 1,0 185405 2 494264

3s 3p3

3s 3p

z

3p3

S°

3

ps ipo

1 245232

1 252493 Ca viii (

2 P£) Limit — [1030000]

October 1947.
Ca vm

253

(A1 i sequence; 13 electrons) Z—20

Ground state Is2 2s2 2_p

6 3

2 3p2Py

3p 2Py2 1189000 cm"1 I. P. 147 volts

The analysis is by Whitford and by Phillips. Thirty-five lines have been classified in the

interval between 114 A and 596 A. No intersystem combinations have been observed, but

Philli ps estimates that 3p2 4Py is approximately 128000 cm-1 above the ground state. This

value is entered in brackets in the table. The uncertainty x may exceed ± 1000 cm-1

. Using the method suggested by Edl6n, the writer has extrapolated the value of the limit

quoted above and entered in brackets in the table. The uncertainty in this estimate is large

owing to the incompleteness of the isoelectronic sequence data.

REFERENCES

A. E. Whitford, Phys. Rev. 46, 793 (1934). (T) (C L)

L. W. Phillips, Phys. Rev. 55, 708 (1939). (T) (C L)

Ca vm Ca vm

Config. Desig. J Level Interval Config. Desig. J Level Interval

3s2 (*S) 3p 3p 2 P° % 0

4305 3s 3p(3 P°)3d 3d 4 D° X 410725 +x 558

381

118

1 X 4805 1/2 411288 +x

2H 411664 +z

3s 3

p

2 3p2 4 P X

1/2 [128000]

129581 +x 1581

2361

3/ 411782 +x

2/ 131942 +x 3s2 OS) 4s 4s 2 S X 547308

3s 3p2 3

p

2 2 D 1/ 171573 255 3s 3p(3 P°)4s 4s 4 P° X 687650 +z 1367

2709 2/ 171828 1/2 689017 +x

2y2 691726 +x

3s 3p2 3

p

2 2 S X 216590

3s2 (

1 S)4d 4d 2 D i/ 697981

191

3s 3p2 3

p

2 2 P X

ix

231012

233584 2572 2/ 698172

3s2

(

1 S)5d 5d 2 D i X 872860 210

3s2 pS)3d 3d 2 D 1/ 282362 212 2% 873070

2/ 282574

3p3 3p3

S° 1/ 844176 +x

Ca iv 0S0) Limit [ 1189000]

September 1947. Ca viii Observed Terms*

Config.

Is2 2s2 2p8 +

Observed Terms

3s2 pS)3p 3p

2 P°

3s 3p2 / 3p2 4 P

\3p2 2S 3p2 2P 3p2 2 D

3p

3 3p3 4S°

ns (n> 4) ndt (n> 3)

3s2 (*S)nx 4s »S 3-5d 2 D

3s 3p(3 P°)nx 4s 4 P° 3d 4 D°

*For predicted terms in the spectra of the A1 1 isoelectronic sequence, see Introduction.
(Mg i sequence; 12 electrons) Z=20

Ground state Is2 2s2 2p6 3

2 'So

3s2 'So 1519000 ± cm-1

I. P. 188 ± volts

Twenty-eight lines have been classified in the range between 100 A and 828 A. The

triplet terms are from Parker and Phillips; the singlets from Tsien. By extrapolation along

the sequence, Mrs. Beckman has classified a line at 693.824 A as the intersystem combination

3s2 'So —Sp

3P?. The listed values of the triplet terms have been adjusted to fit this assignment.

From isoelectronic sequence data, the writer has extrapolated the value of the limit, us- ing the method suggested by Edl6n. This value is entered in brackets in the table. Although

this estimate may be in error by more than ± 1000 cm-1

, it gives an approximate value of the

ionization potential.

REFERENCES

A. Beckman, Bidrag till Kannedomen om Skandiums Spektrum i Yttersta Ultraviolett, Akademisk Avhandling

p. 55 (Almqvist and Wiksells Boktryckeri -A.-B., Uppsala, 1937). (C L)

W.-Z. Tsien, Chinese J. Phys. 3, No. 2, 142 (1939). (T) (C L)

W. L. Parker and L. W. Phillips, Phys. Rev. 57, 140 (1940). (T) (C L)

Ca IX Ca IX

Config. Desig. J Level Interval Config. Desig. J Level Interval

3s2 3s2 !S 0 0 3s(2 S)4s 4s 3S 1 760002

3s(2S)3p 3p

3 P° 0 1 42685 140^ 3s(2S)4d 4d 3 D 1 916652

128

210

12 144180

147870 3240 23

916780

916990

3s(2S)3p 3p

iP 0 1 214487. 8 3s(2S)4/ 4/ 3 F° 2 954003 20

32

3 954028

3s(2 S)3d 3d !D 2 335195. 0 4 954055

3p

2 3p

2 3 P 0 339420 1913

3602

3s(2 S)5d 5d 3 D 1

1 341333 2 1137720

160 2 344935 3 1137880

3s(2S)3d 3d 3 D 1 411525 127

206 2 411652

3 411858 Ca x (

2S>$) Limit [1519000]

March 1948.
Ca x 255

(Na i sequence; 11 electrons) Z—20

Ground state Is2 2s2 2p

6 3s

2S^

3s 2Sh 1704660 cm"1 I. P. 211.29 volts

Kruger and Phillips extended the earlier analysis by Edlen. Their absolute term values

are derived from three members of the 2D-series. One term, 5s 2S has been added from the

work of Tsien but adjusted to agree with those by Kruger and Phillips.

Twenty-two lines have been classified in the range from 93 A to 574 A.

REFERENCES

W.-Z. Tsien, Chinese J. Phys 3, No. 2, 145 (1939). (T) (C L)

P. G. Kruger and L. W. Phillips, Phys. Rev. 55, 352 (1939). (I P) (T) (C L)

Ca x Ca X

Config. Desig. J Level Interval Config. Desig. J Level Interval

3s 3s 2 S k 0 4/ 4/ 2 F° 2%

3K

1016118

1016208 95

3V 3v

2 P° Y2 174214 5081

IK 179295 5s 5s 2 S K 1170098

3d 3d 2 D IK 417113 414 5d 5d

2 D IK 1248686

105 2}i 417527 2K 1248791

4s 4s 2 S K 832838 5/ 5f

2 F° 2K

3K

1263323

1263383 60

4p 4p 2 P° K 899805 1905

6/ 6/ IK 901210 2 F° 2K

3K 1898140

4d 4d 2 D IK

2K

987259

987484 225

Caxi OSo) Limit 1704660

(Ne i sequence; 10 electrons) Z=20

Ground state Is2 2s2 2

p

6

2p6 XS0 4774300 cm-1

I. P. 591.8 volts

Eleven lines between 25 A and 35 A have been classified by Edlen and Tyren as combinations with the ground term. Their absolute term values have been extrapolated along the

Ne i isoelectronic sequence.

By analogy with Ne i, the ^-coupling notation in the general form suggested by Racah

is introduced.

The unit adopted by Edlen and Tyren, 103 cm-1

, has here been changed to cm-1

. REFERENCES

B. Edl6n and F. TyrSn, Zeit. Phys. 101, 206 (1936). (1 P) (T) (C L)

G. Racah, Phys. Rev 61, 537 (L) (1942).
256

Ca XI Ca XI

Authors Config. Desig. J Level Authors Config. Desig. J Level

2

p

iSo 2s2 2p

6 2p 6 iS 0 0 3p' iPj 2s 2p6

( 2S) 3p 3p

iP° 1 8708900

2s2 2p5

( 2 Pfo)3s 3s [O/2] 0 2 2s2 2p5

(

2 Pf^) 4s 4s [i y2]° 2

3s 3 Pj 1 2810900 4s 3 Pj 1 3758900

2s2 2p5

( 2 P£)3s 3s' [ yr 0 2s2 2p5( 2 P£)4s 4s' [ y2]° 0

3s *Pi 1 2889900 4s ip

x 1 3781900

2s2 2p5 (

2 Pi*)3

3d [ 0 4d iPj 2s2 2p5

(2 P!^)4d 4d [1^]° 1 3919000

3d

3 Pi 1 8199800

4d 3 D! 2s2 2p5 (

2 P£)4d 4d' [1H]° 1 3948400

3d !Pi

ft 3d mr 1 8289700

3d 3Dj 2s2 2p5

( 2 P£)3d 3d' [i/2 ]° 1 3284800

Ca xii (

2 P!^) Limit 4774300

2s 2p6

( 2S)3p 3p

3p° 2

3v'

3 ?i 1 8692900 Ca xii (

2 P£) Limit 4804328

0

April 1947.

Caxi Observed Levels*

Config.

ls 2 +

Observed Terms

2s2 2p6 2p

6 iS

ns (n> 3) np (n> 3) nd (n> 3)

2s

2 2p5 (2 P°)nx / 3, 4s 3 P°

\ 3, 4s !P° 3d 3 P° 3, 4d 3 D°

3, 4d iP°

2s 2p6

( 2 S)na; {

3p

3 P°

3p

iP°

jZ-Coupling Notation

Observed Pairs

ns (n> 3) nd (n> 3)

2s2 2p5

( 2 Pfx)nx 3, 4s [1 y2]° 3d [ y2 y

3, 4d [i/2 ]°

2s2 2p5

(

2 P£)nx' 3, 4s'[ y2 ]° 3, 4d'[ltf]°

*For predicted levels in the spectra of the Ne i isoelectronic sequence, see Introduction.
257

Ca xii

(F i sequence; 9 electrons) Z=20

Ground state Is2 2s2 2p5 2Pi^

2p

5 2P°^ cm-1

I. P. 655 volts

Edlen and Tyren have classified 9 lines in the range 27 A to 32 A. They have published no term array because the analysis is so incomplete. In the 1942 paper Edlen lists the interval of the ground term as 30028 cm-1

, a value based on unpublished material. From these

data preliminary term values have been calculated and entered in the table.

REFERENCES

B. Edldn and F. Tyr6n, Zeit. Phys. 101, 206 (1936). (C L)

B. Edl£n, Zeit. Astroph. 22, 59 (1942). (I P) (T)

Ca xii

Edl6n Config. Desig. J Level Interval

2v

2 P2 2s2 2p5 2p5 2p° 1/2 0

2 -30028

Pi / 30028

3s 4 P3 2s2 2p4

( 3 P)3s 3s

4P 2/ 3062300 - 14800 *P2 l/2 3077100

/

3s 2 P2 2s2 2p4

( 3 P)3s 3s 2 P I /2 3097900

2 Pi z

3s 2 D3 2s2 2p4 (

4 D)3s 3s' 2 D 2/2 3158600

2 -300 d2 1/2 3158900

3d 2s2 2pi

(

1 T>)3d 3d' X 3574200

Td 2 d3 2s2 2p4 (*S)3d 3d" 2 D 2/2 3648000

2 -4400 D2 1/2 3652400

March 1947.
258

Ca xin

(0 i sequence; 8 electrons)

Ground state Is2 2s2 2p* 3 P2

Z=20

2p* 3 P2 cm-1I. P. volts

This spectrum has not been analyzed. Edlen suggests the possibility that the line observed in the coronal spectrum at 4086.3 A (24465 cm-1

) may be due to the forbidden transition 2p

4 3P2 — 3 Pi of Ca xm. This separation for the leading components of the ground

term is not inconsistent with that extrapolated along the O i isoelectronic sequence.

B. Edl6n, Zeit. Astroph. 22, 62 (1942).

March 1947.

REFERENCE

(T)

Ca xv

(C i sequence; 6 electrons)

Ground state Is2 2s2 2p

2 3P0

Z=20

2p

2 3P0 cm-1

. I. P. volts

An extrapolation of the ground term interval along the Ci isoelectronic sequence indicates that the separations of the components of the ground term, 2s2 2p

2 3P, should be approximately 17700 cm-1

, according to Edlen. He suggests that the line observed in the solar corona at 5694.42 A, wave number 17556 cm-1

, may tentatively be identified as [Caxv]?,

2s2 2p2 3 P0 —2s2 2p

2 3 PX

. REFERENCE

B. Edl6n, Zeit. Astroph. 22, 59 (1942).

March 1947

(T)
SCANDIUM

Sc I

21 electrons Z=21

Ground state Is2 2s2 2p

Q 3s2 Sp6 3d 4s2 2Di^

a

2Di^ 52920 cm-1

I. P. 6.56 volts

The analysis is chiefly from the paper by Russell and Meggers with some additions from

unpublished manuscript generously furnished by Russell. In the published analysis the

terms a

4P, y

4P°, and z

4S° were unconnected with the rest and a4P^ was assigned the value

x. The connection is now established from observed combinations.

Similarly, the group a

2P, v

2D°, z2S° and u2T)° were connected with the rest only by

the relation a

2Py=y. Ufford has predicted the relative position of a2P. His estimated

value, a

2P^=21400, is entered in brackets in the table and has been added to all levels in this

group of terms. The uncertainty is indicated by y since the group is not connected with the

rest by observed combinations.

The two terms, /

4P and x

4D° have been added from the unpublished material mentioned

above. The limit is also from a recalculation of the series recently made by Russell for

inclusion here.

Russell and Meggers have noted that the assignment of the limit terms to the two triads

z

2P° z

2D° z2F°, y

2P° y

2D° y

2F° is uncertain. One triad has the limit a

3D in Sc ii and

the other, a

4D. Russell, in discussing the behavior of the d electrons in related spectra, concludes that the higher triad has as its limit the term of higher multiplicity. (See 1927 reference

below.)

The doublet and quartet terms are connected by observed intersystem combinations.

In the 1925 paper mentioned below some observed Zeeman patterns are given. Catalan

has calculated from these patterns the ^-values listed in the table.

REFERENCES

S. Goudsmit, J. van der Mark, and P. Zeeman, Proc. Roy. Acad. Amsterdam 28, No. 2, 127 (1925). (Z E)

H. N. Russell and W. F. Meggers, Sci. Papers Bur. Std. 22, No. 558, 340 (1927). (I P) (T) (C L) (G D)

H. N. Russell, Astroph. J. 66, 201 (1927); Mt. Wilson Contr. No. 341 (1927). C. W. Ufford, unpublished material (July 1941). (T)

H. N. Russell, unpublished material (Jan. 1934, May 1948). (I P) (T) (C L)

M. A. Catalan, unpublished material (June 1948). (Z E)

W. F. Meggers, J. Opt. Soc. Am. 36, 431 (1946). (Summary hfs.)
260

Sc I Sc I

Config. Desig. J Level Interval Obs. g Config. Desig. J Level Interval Obs. g

3d 4s2 a 2 D IK 0. 00

168. 34 0. 79 3d2 (a 3 F)4p

y 4 D° K 32637. 40

21. 81

37. 63

54. 70 2y2 168. 34 1. 20 IK 32659. 21 2K 32696. 84

3d2 (a 3 F)4s a 4F 11520. 15 37 49 3K 32751. 54

2/2 11557. 64

52. 60 3K 67. 07 11610. 24 3d2 (a 3 F)4p 2 2 G° 3K 33056. 19

95. 21 4y2 11677. 31 4K 33151. 40

3d2 (a 3F)4s a 2F 2V2 14926. 24

115. 74 3d2 (a 3 F)4p * 2 F° 2K 33154. 01

124. 63

3/2 15041. 98 3A 33278. 64

3d 4s (o 3 D)4p z 4po

1/4 15672. 55 83 96 3d2 (a 3F)4p

x 2 D° IK 33615. 06

92. 19

2}4 15756. 51

125. 25

144. 76

2K 33707. 25

3/2 4K

15881. 76

16026. 52 3d3 e 4F IK 33763. 57

35. 11

47. 94

59. 78 3d 4s (a 3 D)4p 2 4 D° K 16009. 71 12 07

2K

3J4 33798. 68

33846. 62

1/4 16021. 78

119. 26

69. 76

4^ 33906. 40

2/2 16141. 04

3d 4s (a 3 D)5s e 3K 16210. 80 4D K 34390. 25

32. 60

57. 20

87. 05

IK 34422. 85

3d 4s (a

x D)4p 2 2 D° 2X 16022. 72 -74. 14 2K 34480. 05 1 % 16096. 86 3^ 34567. 10 3d2 (5 x D)4s b 2 D 2K 17012. 98 -12. 38 3d 4s (0 3 D)5s e 2D IK 35671. 00

74. 57

1/4 17025. 36 2K 35745. 57

3d2 (a 3 P)4s a 4P K 17918. 85 9Q IS 3d3 : f 2 D IK 36276. 76

53. 73 1 %2H

17947. 98

18000. 25 52. 27 e 4P

2K 36330. 49

3d3 K 36492. 82

22. 94

57. 04 3d 4s (a 3 D)4p 2 4P° K 18504. 05 1 1 72 IK 36515. 76

1/2 2/2 18515. 77

18571. 40

55. 63

w 2 D°

2}4 36572. 80 3

2 (6 x D)4p IK 36934- 15

105. 62

3d 4s (a

x D)4p 2 2 P° K 18711. 03

144. 73 2K 37039. 77

1/4 18855. 76

3d 4s (a 3 D)4d e 2 P K 37085. 72

62. 53

3d2 (a

x G)4s a 2 G 4K 20237. 10 -2. 82 IK 37148. 25

3% 20239. 92

3d2 (6 X D)4p w 2 P° IK 37086. 31 -39. 41 3d 4s (a X D)4p 2 2F° 2/2 3K

21032. 78

21085. 84

53. 06

3d2 (a 3 P)4p

x 4 D° KK

37125. 72

3d2 (a 3 P) 4s a 2 P K [21400 ]+y 80. 40 IK 37486. 48 66 86

1/4 21480. 40 +y 2K 37553. 34 163. 77 J >4 1 1/2

3K 37717. 11 3d 4s (a 3 D)4p V 2 P° }

24656.80 3d 4s (a 3 D)4d g 2 D iK

2K

37780. 83

37855. 50 74. 67

3d 4s (a 3 D)4p

y 2 D° IK 24866. 18

147. 97 0. 82 2 4 2H 25014- 15 1. 17 3d2 (a 3 P)4p S° IK 38179. 92

3d 4s (a "D)4p y 2F° 2K 25584. 64 140. 08 0. 90 3d2 (a 3 P)4p

y 4 P° K 38570. 64 30 86

3K 25724. 72 1. 14 IK

2K

38601. 50

38657. 93 56. 43

3d2 (a 3 F)4p 2 4 G° 2/2 29022. 87

73. 33

93. 63

113. 69 e 3x/2 29096. 20 3d 4s (a 3 D)4d 2 G 3K 38571. 70

86. 53

4>4 5K

29189. 83

29303. 52 4y2 38658. 23

3d 4s (0 3 D)4d e 2 F 2K 38871. 60

87. 56

3d2 (a

xS)4p

x 2P° K 30573. 10

133. 51 0. 68 3K 38959. 16 IK 30706. 61 3d2 (a x G)4p 2 2H° 4K 39153. 42 95. 85

3d2 (a *F)4p

y 4F° IK 31172. 62 4.Q 14 5K 39249. 27

2K

3K

31215. 76

31275. 32 59. 56

75. 49 3d2 (a

x <?) 4p

y 2G° 3K 39392. 95

4K 31350. 81 4K 39423. 73 30. 78
261

Sc I—Continued Sc I—Continued

Config. Desig. J Level Interval Obs. g Config. Desig. J Level Interval

3d 4s (a 3 D)4d /

4 D X 39701. 30 20 41 3d2 (a 3 P)4p: v

2 D° 1/2 48166. 52 +y 54. 22

1/2 39721. 71 33 22 2% 48220. 74 +y 2/ 39754. 93

44. 92

3y2 39799. 85 3

d

2 (a 3 P)4p: 0

2 S° z 43337. os+y

3d 4s (a 3 D)4d e

4 G 2X 39861. 25 41 40 g

4 D K

3/2 39902. 65

55. 06

70. 52

1/2 4/2 39957. 71 2 /

5>2 40028. 23 3H 44598. 80

3d2 (a *G)4p w 2 F° 2h 89881. 25

7. 86 4p2 (/

3 P)3d h

4 F 1/2 44823. 06

86. 44

106. 87

109. 20

3/ 89889. 11 2/2 44909. 50

3d 4s(a 3 D)4d /

4 F IK 40521. 21

33. 77

49. 04

66. 85

3K

4/

45016. 37

45125. 57 2/ 40554. 98

3/ 40604. 02 i

4 F 1/2 47898. 95

47. 30

125. 52

251. 81?

4/2 40670. 87 2 / 47946. 25

h

2 D I /2 2J4 40802. 72

40825. 65 22. 93

3H

4y2 48071. 77

48323. 58? u

2 D° 1/2 51231. 50+y 98. 04 3d 4s (a 3 D)4d /

4 P y2 41447. 02 97 2/ 51829. 54+y

1/2 2^2

1 /

2 /

41474. 88

41505. 65 30. 77

3d2 (a 3 F) 5s g

4F 41921. 94

38. 92

Zd 71 Sc 11 (a 3 Di) Limit 52920

41960. 86

3y2 42015. 57

69. 44 4/ 42085. 01

June 1948.

Sc i Observed Terms*

Config.

Is 2 2s2 2p

6 3s2 3p

6 +

Observed Terms

3d 4s2 a

2 D

3d3 je 4 P e /

2 D:

4 F

ns (n> 4) np (n> 4) nd (n> 3)

3d 4s (0 3 D)rcx

{

e

4 D

e

2 D O

O 2

4 D°

y

2 D°

OO /

4 P /4 D /

4 F

e

2 P g2 D e

2 F

e

4 G

e

2 G

3d 4s (a *D)nx 2

2 P° 22 D° 2

2 F°

3d 2 (a 3 F)nx

{

a, Q a

4F

2JT y

4 D°

x

2 D°

y

4F°

x 2 F° OO O

O

3d2 (5 iD)n® b

2 D w 2P° w 2 D°

3d2 (a 1 S)nx x

2 P°

3d2 (a 3 P)nx fa 4 P

\a 2 P

z

4 S°

2

2 S°: y

4 P° x4 D°

v

2 D°:

3d2 (a 1 G)nx a

2 G w 2 F° y

2 G° 22H°

4p

2 (J3 P)nx h

4F

For predicted terms in the spectra of the Sc i isoelectronic sequence, see Introduction.
262

Sc ii

(Ca i sequence ; 20 electrons) Z=21

Ground state Is2 2s2 2p6 3s2 3p6 3d 4s 3DX

a

3Dx 104000 cm-1

I. P. 12.89 volts

The analysis is from Russell and Meggers. All the terms are from the 1927 paper, except

y

1 P°, which has been taken from the later reference. By analogy with Y ii they assign a *S to the configuration 4s2 in place of the earlier assignment to 3d2

. The singlet and triplet terms are connected by observed intersystem combinations.

The ^-values have been generously furnished by Catalan, who has calculated them from

the observed Zeeman patterns given in the 1925 reference below.

REFERENCES

S. Goudsmit, J. van der Mark, and P. Zeeman, Proc. Roy. Acad. Amsterdam 28, No. 2, 130 (1925). (Z E)

H. N. Russell and W. F. Meggers, Sci. Papers Bur. Std. 22, No. 558, 331 (1927). (I P) (T) (C L) (G D)

W. F. Meggers and H. N. Russell, Bur. Std. J. Research 2, 761, RP 55 (1929). (T) (C L)

M. A. Catalan, unpublished material (June 1948). (Z E)

Sc II Sc II

Config. Desig. J Level Interval Obs. g. Config. Desig. J Level Interval

3d(2 D)4s a

3 D 1 0. 00

67. 68

109. 95

0. 50 3d(2 D)5s e

3 D 1 57551. 46

62. 48

129. 43 2

3

67. 68

177. 63

1. 17

1. 33

2

3

57613. 94

57743. 37

3d(2 D)4s a X D 2 2540. 97 1. 00 3d(2 D)5s e

X D 2 58251. 92

3d2 a 3Fj 2 4802. 75

80. 67

104. 22

0. 67 3d(2 D)4d e

X F 3 59528. 22

3 4883. 42 1. 07

4 4987. 64 1. 24 3d( 2 D)4d /

3 D 1 59874. 79

54. 39

72. 42 2 59929. 18 3d2 b

X D 2 10944. 51 3 60001. 60

4s2 a X S 0 11736. 35 3d(2 D)4d e

3 G 3 60266. 95

81. 25

108. 77 3d2 a 3 P 0 12074. 00

27. 45

52. 89

4

5

60348. 20

60456. 97

1 12101. 45

2 12154. 34 3d(2 D)4d e

X P 1 60400. 02

3d2 a X G 4 14261. 40 3d(2 D)4d e

3S 1 61071. 10 3d(2 D)4p 2

X D° 2 26081. 82 1. 00 3d(2 D)4d e3 F 2 63373. 91

70. 52

83. 30 3 63444. 43

3d(2 D)4p 2

3 F° 2 27US. 65

158. 67

238. 85

0. 65 4 63527. 73

3 27602. 82 1. 10 4 27841. 17 1. 25 3d(2 D)4d /

X D 2 64366. 15 3d(2 D)4p 2

3 D° 1 27917. 69

103. 52

139. 82

0. 51 3d(2 D)4d e

3 P 0 64615. 28

30. 80

59. 08 2 28021. 21 1. 16 1 64646. 08

3 28161. 03 1. 33 2 64705. 16 3d(2 D)4p 2

3 P° 0 29736. 22

5. 90

81. 80

3d(2 D)4d e

XS 0 64942. 79

1 29748. 12

2 29823. 92 1. 50 3d(2 D)4d e

X G 4 65235. 83

3d(2 D)4p 2

X P° 1 80815. 65 1. 00 4p2 /3P 0 76242. 40

117. 41

228. 67 3d(2 D)4p

4s(2 S)4p

2

1 F°

y

3 P°

3

0

82349. 98

89001. 59 112 85

1. 00

1276359. 81

76588. 48

1 89114- 44 230. 46

Sc hi ( 2 89844 90 2 D^)

55715 52

Limit 104000

4s(2S)4p y »P° 1

June 1948.
263

Sc n Observed Terms*

Config.

Is2 2s2 2

p

6 3s2 3p8 +

Observed Terms

3d2 / a

3 P a3 F

\ b iD a *G

4s2 a iS

4p

2 /

3 P

ns (n> 4) np (ft >4) nd (ft >4)

3d(2 D)ftx /

a, e

3 D 2 3po 2

3 D° 2

3 F° e3 S e

3 P /

3 D e

3 F e

3 G

( o, e

X D z ipo 2 ID 0 2 tF0 e iS e *P / iD e

3F e iG

4s(2 S)na: { y

y

o

o

*A chart of predicted terms in the spectra of the Ca i isoelectronic sequence is given in the Introduction. Owing to the change in binding energies of the 3d and 4s electrons along this sequence, the arrangement of the charts of observed and pre- dicted terms is not identical. In Sc n no primes are used to indicate higher limits, and the prefixes a, b, ... e, 2, y, replace

those indicating the running electron. Sc in

(K i sequence ; 19 electrons) Z—21

Ground state Is2 2s2 2p

6 3s2 3p

6 3d

2DX ^

3d

2D1H 199693.0 cm'1 I. P. 24.75 volts

The early analysis by Gibbs and White was revised and extended by Smith. By analogy

with Ti iv, Russell and Lang confirmed Smith’s interpretation, added the 5s 2S term, and

predicted a number of series members. Their term array has been used for the present compilation, predicted values being entered in brackets. Fourteen lines in the range from 730 A

to 4069 A have been classified. REFERENCES

R. C. Gibbs and H. E. White, Proc. Nat. Acad. Sci. 12, 598 (1926). (T) (C L)

S. Smith, Proc. Nat. Acad. Sci. 13, 65 (1927). (I P) (T) (C L)

H. N. Russell and R. J. Lang, Astroph. J. 66, 19; Mt. Wilson Contr. No. 337 (1927). (I P) (T) (C L)

Sc HI Sc III

Config. Desig. J Level Interval Config. Desig. J Level Interval

3p6 (

1 S) 3d 3d 2 D IK 0. 0

197. 5 3p6 0S)5d 5d 2 D IK [148263] 20

2K 197. 5 2K [148283]

3p«(1 S)4s 4s 2 S K 25536. 7 3p 6 (

1S) 6s 6s 2S K [149253]

3p6 (

1 S)4p 4p 2 P° X

IK

62102. 2

62575. 9

473. 7 3p6 (

1 S)5/ 5/ 2 F° / 2K

l 3y2 } [159553]

3p6 (

1 S)4d 4d 2 D IK

2K

112254. 2 112299. 2

45. 0 3p 8 OS)5f7 5g

2 G / 3K

l 4/2 }

[160133]

3p6 (

I S)5s

3p6

(

1 S)5p

5s 2S K

K

IK

114863. 8 5p 2 P° [128183]

[128363] 180 Sc iv 0S0) Limit 199693. 0

3p6 (

1 S)4/ 4/ 2 F° / 2p2 l 3K } 136871. 0

May 1948.
264

Sc IY

(Ai sequence; 18 electrons) Z=21

Ground state Is2 2s2 2p

6 3s

2 3p6 XS0

3p6 XS0 596300 cm-1

I. P. 73.9 volts

The analysis is seriously incomplete, but four lines between 215 A and 298 A have been

independently classified, in the first two references quoted below, as combinations with the

ground term. The two sets of wavelengths are not completely accordant, but the interpretation is the same in both papers.

The levels given in the table are from Mrs. Beckman’s observations, and the limit is from

the other paper. Mrs. Beckman’s unit, 103 cm-1

, has here been changed to cm-1, and all values have been rounded off in the last places. The limit may be in error by several

hundred cm-1

. For convenience, the Paschen notation has been added by the writer in column one of

the table, under the heading “Ai”. As for Ai, the jV-coupling notation in the general form

suggested by Racah is here introduced, although Z^-designations as indicated in column two

under the heading “Authors” are perhaps preferable for the terms thus far identified.

REFERENCES

A. Beckman, Bidrag till Kannedomen om Skandiums Spektrum i Yttersta Ultraviolett, Akademisk Avhandling

p. 90 (Almqvist and Wiksells Boktryckeri -A.-B., Uppsala, 1937). (T) (C L)

P. G. Kruger, S. G. Weissberg and L. W. Phillips, Phys. Rev. 51, 1090 (1937). (I P) (T) (C L) G. Racah, Phys. Rev. 61, 537 (L) (1942).

Sc IV

A i Authors Config. Desig. J Level

lpo 3p

6 iS 3p

6 3p

6 X S 0 0

3p3

(

2 PiH)4s 4s [iy2]° 2

lS4 3p

5 4s 3 P° 1 385090

3p5

(

2 P£)4s 4s' [ y2 ]° 0

ls2 3p

5 4s iP° 1 341010

3p5

[ 2 Pfo)5s 5s [i y2 ]° 2

2s4 3p

5 5s 3 P° 1 460430

3p5 (

2P£)5s 5s' [ y2]° 0

2s2 3p

5 5s iP° 1 463990

Sc v (

2 Pfo) Limit 596300

Sc v (

2P£) Limit 600630

May 1948.
(Cl i sequence; 17 electrons) Z=21

Ground state Is2 2s2 2p

6 3

2 3p5 2Pbs

3p5 2FiH 741000 cm-1

I. P. 92 volts

Fifteen lines have been classified in the region from 228 A to 587 A, as combinations

from the ground term. Two independent sets of term values have been published, that are

in agreement except for the level 4s 4P2^, for which Kruger and Phillips give 387508 cm-1

; and the level 4s 4P^, which was not found by Mrs. Beckman. All other entries in the table are from the latter list. The unit adopted by Mrs. Beckman, 103 cm-1

, has here been changed

to cm-1

. From isoelectronic sequence data Edlen has estimated the limit given above and entered

in brackets in the table.

REFERENCES

A. Beckman, Bidrag till Kannedomen om Skandiums Spektrum i Yttersta TJUraviolett, Akademisk Avhandling

p. 86 (Almqvist and Wiksells Boktryckeri —A.-B., Uppsala, 1937). (T) (C L)

P. G. Kruger and L. W. Phillips, Phys. Rev. 51, 1087 (1937). (T) (C L)

B. Edl6n, Zeit. Phys. 104, 413 (1937). (I P)

Sc v

Config. Desig. J Level Interval

3s2 3p5 3p

5 2 P° B'2 0 -4328

X 4828

3s 3

p® 3

2 S X 174412

3s2 3p4 ( 3 P)4s 4s 4 P 2y2 386387 -2481

-2707 ix

Yi 388868

391575?

3s2 3p4 (

3 P)4s 4s 2 P iy2 X

395503

398447 -2944

3s2 3p4 (

x D)4s 4s' 2 D 2 %

1/2 410050

410133 -83

3s2 3p4

(

x S)4s 4s" 2 S X 437512

Sc vi (

3 P2) Limit [741000]

January 1948.
(S i sequence; 16 electrons) Z=21

Ground state Is2 2s2 2p

6 3s2 3p

4 3 P2

3p

4 3 P2 896000 cm-1

I. P. 111.1 volts

The analysis has been done independently by Mrs. Beckman and by Kruger and Pattin

with results that are substantially in agreement. The triplet terms are quoted from the

former and the singlets from the latter paper. Twenty-nine lines have been classified in the

interval between 200 A and 581 A. The unit adopted by Mrs. Beckman, 103 cm-1

, has here

been changed to cm-1

. Intersystem combinations connecting the singlet and triplet terms have been observed.

The limit is from Edlen, who has extrapolated it from isoelectronic sequence data.

REFERENCES

A. Beckman, Bidrag till Kannedomen om Skandiums Spektrum i Yttersta Ultraviolett, Akademisk Avhandling

p. 76 (Almqvist and Wiksells Boktryckeri -A.-B., Uppsala 1937). (T) (C L)

P. G. Kruger and H. S. Pattin, Phys. Rev. 52, 621 (1937). (T) (G L)

B. Edl6n, Zeit. Phys. 104, 192 (1937). (I P)

Sc VI Sc VI

Config. Desig. J Level Interval Config. Desig. J Level Interval

3s2 3p* 3p4 3P 2

10

0

3352

4453

-3352

-1101

3s2 3p3

( 2 D°)4s

3s2 3p3

( 2 P°)4s

4s' 4 D°

4s" 3 P°

2

0

478354

491826 261

715 21397

1 492087

3s2 3p4 3p4 *D 2 2 492802

3s2 3p* 3p4 4 S 0 49238 3s2 3p3

( 2 P°)4s 4s" »P° 1 497984

3s 3p

B SpB 3po 2 175344 2853

10 Sc vii (

4Sfo) Limit 896000

178197

179784

452070

-1587

3s2 3p3

(

4 S°)4s 4s 3S° 1

3s2 3p3

( 2 D°)4s 4s' 3D° 1 472400 163 2 472563 438 3 473001

January 1948.
Sc vn

267

(Pi sequence; 15 electrons) Z=21

Ground state Is2 2s

2 2%>

6 3s2 3

4S£

y

2

3p3 4Si°h cm-1

1. P. volts

The analysis is incomplete. Six multiplets have been pubhshed by Kruger and Pattin,

who derive term intervals but give no term values. Mrs. Beckman has extended their analysis

slightly and estimated the relative positions of the doublet and quartet systems of terms from

isoelectronic sequence data. Her terms are, in general, quoted, except for the term 3p

4 4P,

which is based on the wavelengths by Kruger and Pattin.

Twenty lines have been classified in the interval between 182 A and 571 A. No intersystem combinations have been observed, as indicated by the uncertainty x in the table and

brackets around 3

p

3 2DiH. The unit adopted by Mrs. Beckman, 103 cm-1

, has here been changed to cm-1

. REFERENCES

P. G. Kruger and H. S. Pattin, Phys. Rev. 52, 624 (1937). (C L)

A. Beckman, Bidrag till Kannedomen om Skandiums Spektrum i Yttersta Ultraviolett, Akademisk Avhandling

p. 71 (Almqvist and Wiksells Boktryckeri -A.-B., Uppsala, 1937). (T) (C L)

Sc vn Sc vn

Config. Desig. J Level Interval Config. Desig. J Level Interval

3s2 3p3 3p3 4S° 1 X 0 3s2 3p2

(

3 P) 3d 3d 2P i h

y2 329950 +x

333360 +x -3410

3s2 3p3 3p

3 2 D° iy2 [30000]+x 670 2y2 30670 +x 3s2 3p2

(3 P)4s 4s 4P y2 541670

1930

1/2 543600?

3s2 3p3 3p3 2 P° y2 49840 +x 900 2/2 546490 2890

iy2 50740 +x

3s2 3p2

( 3 P)4s 4s 2 P / 551940 +x 3260

-130

3s 3p4 3

p

4 4P 2/

1/2X

175050

177760

179200

—2710 — 1440

3s2 3p2

(

1 D)4s 4s' 2 D

3/2 2/

1/2

555200 +x

568860 +x

568990 +x

December 1947.

Sc vii Observed Terms*

Config.

Is2 2s2 2p6 +

Observed Terms

3s2 3p

3 |3p

3 4 S°

3p

3 2 P° 3p3 2D°

3s 3p* 3p

i 4 P

ns (n> 4) nd (n> 3)

3s

2 3p2

(

3 P)nx

{

4s 4 P

4s 2 P 3d 2 P

3s2 3p2

(

1 D)nx' 4s' 2 D

*For predicted terms in the spectra of the Pi isoelectronic sequence, see Introduction.
268

Sc viii

(Si i sequence; 14 electrons) Z—21

Ground state Is2 2s2 2^>6 3s2 3jp

2 3P0

3^2 3P0 1280000 cm”1 I. P. 159 volts

The analysis is incomplete. The results by Kruger and Phillips are not entirely in agreement with those by Mrs. Beckman. The present list has been compiled from the three ref- erences below. One term, 4s XP°, has been calculated from its combination with 3p2 :D2 as given by Mrs. Beckman. Twenty-five lines are classified in the region between 164 A and

494 A. Intersystem combinations connecting the singlet and triplet terms have been

observed. The limit, entered in brackets in the table, has been estimated by Phillips.

REFERENCES

A. Beckman, Bidrag till Kannedomen om Skandiums Spektrum i Yttersta Ultraviolett, Akademisk Avhandling

p. 65 (Almqvist and Wiksells Boktryckeri -A.-B., Uppsala, 1937). (T) (C L)

P. G. Kruger and L. W. Phillips, Phys. Rev. 52, 97 (1937). (T) (C L)

L. W. Phillips, Phys. Rev. 55, 708 (1939). (I P) (T) (C L)

Sc viii Sc viii

Config. Desig. J Level Interval Config. Desig. J Level Interval

3s2 3p2 3p2 3 P 0

12

0

2280

5510

2280

3230

3s2 3p(2 P°)3d 3d

3 P° 2

10

319570

822540

823670

-2970

-1130

3s2 3

p

2 3p2

D 2 25030 3s2 3p(2 P°)4s 4s 3 P° 0 603540 1070

4570 1 604610

r 2 I 2 609180

3s 3p3 3p3 3po i 207760

l o J 3s2 3p(2P°)4s 4s ip° 1 614100

3s 3p

3

3s 3p

3

3p3 3 S°

3p3 ip°

i 271680

i 281520 Sc ix (

2 P£) Limit [1289000]

October 1947.
Sc ix

269

(A1 i sequence; 13 electrons) Z=21

Ground state Is2 2s2 3s2 3p

2PA

3p

2P°A 1456000 cm"1 I. P. 180 volts

The analysis is incomplete, but 17 lines have been classified in the region between 119 A

and 537 A. The listed term values have been calculated by the writer from the combinations

given in the references below.

No intersystem combinations have been observed. Using the method of extrapolation

suggested by Edlen, the writer has estimated that Sp2 4PA is about 141000 cm-1 above the

ground state. This value is entered in brackets in the table and has been added to all quartet

terms. The uncertainty x may well exceed ± 1000 cm-1

. Similarly, she has extrapolated the

value of the limit quoted above and entered in brackets in the table. The uncertainty in this

estimate is large owing to the incompleteness of the isoelectronic sequence data.

REFERENCES

A. Beckman, Bidrag till Kannedomen om Skandiums Spektrum i Yttersta Ultraviolett, Akademisk Avhandling

p. 59 (Almqvist and Wiksells Boktryckeri -A.-B., Uppsala 1937). (T) (C L)

P. G. Kruger and L. W. Phillips, Phys. Rev. 52, 97 (1937). (T) (C L)

Sc IX Sc IX

Config. Desig. J Level Interval Config. Desig. J Level Interval

3s2

(

x S)3p 3p

2 P° / 0

5760 3s2

(

X S) 4s 4s 2 S Vi 666260

3s 3

p

2

1/2 5760

3s 3p(3 P°)4s 4s 4 P° / 819550 +x 1940

3630 3

p

2 4 P >2 [141000] +£ 2120

3160

1/2 821490 +x

1/2 2y2 143120 +x

146280 +x

2/ 825120 +x

3s 3

p

2 3s2 0S)4d 4d 2 D 1>2 837210 240

3p2 2 D 1/ 2/2 837450

2/2 191760

3s 3p2 3p2 2 S h 240410

Sc x OS0) Limit [1456000]

3s 3

p

2 3p2 2 P }'2 255830 3320

1/2 259150

3s2 OS) 3d 3d 2 D 1/2 313860 350 2/2 314210

October 1947. Sc ix Obsekved Terms*

Config.

Is 2 2s2 2p« +

Observed Terms

3s2 OS) 3p 3p

2 P°

3s 3p

2 {3p2 2 S 3p 2 4 P

3p2 2 P 3p2

D

ns in> 4) nd (n> 3)

3s2

(

x S)tix 4s 2 S 3, 4d 2 D

3s 3p(3 P°)nx 4s 4 P°

*For predicted terms in the spectra of the All isoelectronic sequence, see Introduction.
(Mg i sequence; 12 electrons) Z=21

Ground state Is2 2s2 3s2 XS0

3s2 X S0 1819530 cm-1

I. P. 225.5 volts

The terms are from the paper by Mrs. Beckman, who has classified 26 lines in the region

between 76 A and 628 A. She lists one intersystem combination, 3s2 1 S0 —3^?

3 Pi, and

derives absolute term values from the 3d

3D—nf 3 F° series (n=4, 5, 6).

Parker and Phillips have independently found four triplet terms 3jp

3 P°, 3d

3D, 4s 3 S,

and 4/ 3 F°. Their arrangement of the 3p

3 P°—4s 3 S and 3d 3 D—4/

3F° multiplets is identical

with Mrs. Beckman’s but they differ from her in the interpretation of the group of lines

ascribed to 3p 3 P° —3d 3 D.

Their resulting terms that differ from those listed below (adjusted to the same zero point)

are as follows:

Desig. Level Desig. Level

3d 3 D3 455510 4/sf: 1117757

3 d2 455199 3 F°3 1117710

3D, 455007 3 f2

° 1117689

By extrapolation along the isoelectronic sequence, using the method suggested by Edlen,

the writer calculates the limit to be approximately 1818600 cm-1

(I. P. 225.4), or about 1000

cm-1 lower than that derived by Mrs. Beckman from the 3F° series. The unit adopted by Mrs. Beckman, 103 cm-1

, has here been changed to cm-1

. REFERENCES

A. Beckman, Bidrag till Kannedomen om Skandiums Spektrum i Yttersta Ultraviolett, Akademisk Avhandling

p. 53 (Almqvist and Wiksells Boktryckeri -A.-B., Uppsala, 1937). (I P) (T) (C L) (G D)

W. L. Parker and L. W. Phillips, Phys. Rev. 57, 140 (1940). (T) (C L)

Sc x Sc x

Config. Desig. J Level Interval Config. Desig. J Level Interval

3s2 3s2 iS 0 0 3s ( 2S) 5p 5p !P0

1 1809880

3s(2 S)3p 3p

3 P° 0 157280 1980

4320

3s(2 S)5d 5d 3 D 1 12 159210

168580

2

3 1351120

3s(2 S)3p 3p

iP° 1 286490 3s(2 S)5/ 5f

3 F° 2 1874440 110 3 1874550

3s(2 S)3d 3d 3 D 1 458710 320

440

4

2 459030

3 459470 3s(2 S)6/ 6/ 3 F° 2

o 3s(2 S)4s 4s 3 S 1 899250 4 1511180

3s(2 S)4p

3s(2 S)4d

4p !P0

4d 3D

1 980600

1 1074060 190

280

Sc xi (

2 S*) Limit 1819530

2 1074250

3 1074530

3s(2 S)4/ 4f

3 F° 2 1121400 150

3 1121550 190 4 1121740

March 1948.
Sc xi

271

(Na i sequence; 11 electrons) Z=21

Ground state Is2 2s

2 2p6 3s

3s 2S^ 2015030 cm"1 I. P. 249.76 volts

The analysis is by Mrs. Beckman who has extended the work of Edlen and of Kruger

and Phillips. She has published 30 classified lines in the interval from 62 A to 168 A.

The absolute value of the ground state is extrapolated from isoelectronic sequence data.

The unit adopted by Mrs. Beckman, 103 cm-1

, has here been changed to cm-1

. REFERENCES

B. Edl6n, Zeit. Phys. 100, 621 (1936). (T) (C L)

A. Beckman, Bidrag till Kannedomen om Skandiums Spektrum i Yttersta Ultraviolett, Akademisk Avhandling,

p. 45 (Almqvist and Wiksells Boktryckerl -A.-B., Uppsala, 1937). (I P) (T) (C L) (G D)

Sc xi Sc XI

Config. Desig. J Level Interval Config. Desig. J Level Interval

3s 3s 2 S X 0 5/ 5/ 2 F° 2X 1482160 50

3X 1482210

3p 3p

2 P° X 191080 6690

1 X 197720 6s 6s X

2 S 1588790

3d 3d 2 D ix 459410 620 6p 6p

2 P° X

2X 460030 1/2 1609480

4s 4s 2 S X 977470 6d 6d

2 D IX

2/2 1635020

4p 4p 2 P° X 1051340 2530

1/2 1053870 6/ 6/ 2 F° 2/2 3X 1645030

4d 4d

2 D 1/

2/2 1148560

1148830 270

7d 7d

2 D 1/2 2X 1736700

4/ 4/ 2 F° 2 X 1182570 110

3/2 1182680 7/ 7/ 2 F° 2X

\<M CO r-tN 1743430

5s 5s 2 S X 1382110

5p 5p

2 P° X

1/2

1/2

1418280

1419550

1464770

1270

Sc xii (

1S0) Limit 2015030

5d 5d 2 D

100

2/2 1464870

June 1947.
272

Sc xn

(Ne i sequence; 10 electrons) Z=21

Ground state Is2 2s2 'So

2p6 'So 5539700 cm"1 I. P. 686.6 volts

Edlen and Tyren have classified five lines in the range 26 A to 30 A, as combinations with

the ground term. Their absolute term values are based on extrapolation along the Nei

isoelectronic sequence. Their unit, 103 cm-1

, has here been changed to cm-1

. As for Ne i, the ^-coupling notation in the general form suggested by Kacah is introduced.

REFERENCES

B. Edl6n and F. Tyr6n, Zeit. Phys. 101, 210 (1936). (I P) (T) (C L)

G. Racah, Phys. Rev. 61, 537 (L) (1942).

Sc xn

Authors Config. Desig. J Level

2p

1 S0 2ps 2

p® iS 0 0

3s 3 Px 2p3

( 2 Ph*)3s 3s [1 y2]° 2

1 3245100

3s !P, 2p3

( 2 P£)3s 3s'[ y2]° 0

1 3280800

3d 3 Px 2p5

(

2 P°^)3d 3d [ y2]° 0

1 3668400

3d iPi n 3d [i y2]° 1 3714700

3d 3 Dj 2p5 (

2 P£)3d 3d' [iy]° 1 3767300

Sc xm (

2 Pbd Limit 5539700

Sc xm (

2 P£) Limit --- 5577400

April 1947.
TITANIUM

Ti I

22 electrons Z=22

Ground state Is2 2s2 2p6 3s2 3p

6 3d2 4s

2 3F2

a

3F2 55138 cm-1

I. P. 6.83 volts

The arc spectrum of titanium was one of the first highly complex spectra to be analyzed

fairly completely. The detailed analysis published by Russell in 1927 contains 142 terms based on 422 multiplets, and lists 1394 classified lines. Singlet, triplet, and quintet terms are con- nected by intersystem combinations. This paper, which represents the work of many early

contributions as well, by King, Meggers, Kiess, Babcock, and many others, is concluded with

the noteworthy statement “The present theories of atomic and spectral structure suffice to

give a most satisfactory account, in full and complete detail, of all the features of the very

complex spectrum of titanium.”

From infrared observations Kiess and Meggers have added the terms d

3P and a5D. In

1940 Russell added e

3H and in 1947 he revised the configuration assignments for inclusion

here, as given in column one of the table.

The term values given to three places in the table are from the 1928 paper by Kiess, who

calculated them from lines he observed with the interferometer.

Approximate gr-values have been calculated by the writer from the Zeeman patterns

observed by King and Babcock and quoted by Russell (1927). Most of the observed patterns

are unresolved, and consequently the observed ^-values differ from the theoretical ones, by a

few percent in some cases. They verify the analysis, however, with remarkable consistency.

Colons indicate that the observational data are insufficient to give an independent ^-value.

It is highly desirable to extend this work with the aid of Harrison’s unpublished Zeeman

observations of titanium.

Both Many and Rohrlich have made theoretical investigations of this spectrum. In

the former paper the reality of the term a

X S0 at 15166.59 is questioned and this term has been

rejected by Russell. Rohrlich has suggested that the 1 P° term at 39265.80 may be a

XD°

term. This change has been adopted in the table and the labels of higher X P° and XD° terms

changed accordingly, since it has been noted by Russell that this term may equally well be a

1D° term. In cases where Rohrlich’s configuration assignments differ from those of Russell a

colon is entered in column one after the configuration.

REFERENCES

H. N. Russell, Astroph. J. 66, 347 (1927); Mt. Wilson Contr. No. 345 (1927). (I P) (T) (C L) (G D) (Z E)

C. C. Kiess, Bur. Std. J. Research 1, 77, RP4 (1928). (T) (C L)

W. F. Meggers and C. C. Kiess, Bur. Std. J. Research 9, 310, RP473 (1932). (T) (C L) C. C. Kiess, J. Research Nat. Bur. Std. 20, 35 (RP1062) (1938). (T) (C L)

H. N. Russell, unpublished material (May 1940, April 1947). (T) (C L)

A. Many, Phys. Rev. 70, 511 (1946). F. Rohrlich, Phys. Rev. 74, 1381 (1948). C. E. Moore, unpublished material (June 1948). (Z E)
274

Til Til

Config. Desig. J Level Interval Obs. g Config. Desig. J Level Interval Obs. g

3d2 4s2 a 3 F 234

0. 000

170. 132

386. 873

170. 132

216. 741

0. 66

1. 08

1. 25

3d2 4s (a 2F)4p z 3 F° 234

19323. 003

19421. 580

19573. 980

98. 577

152. 400

0. 67

1. 07

1. 26 3d\b 4F)4s a 5F 1 6556. 86

41. 97

62. 17

81. 79

100. 21

0. 00 3d2 4s (a 2 F)4p 3 3 D° 1 19937. 878

68. 171

120. 023 2 6598. 83 0. 99 2 20006. 049 1. 16 3 6661. 00 1. 25 3 20126. 072 1. 34 4 6742. 79 1. 35 5 6843. 00 1. 41 3d3 (a 2 P)4s a 4 P 1 20062. 98 1. 03

3d2 4s2 a 4 D 2 7255. 29 1. 02 3d3 (6 2 D)4s

b iD 2 20209. 64 1. 01: 3d2 4s2 a 3 P 0 8436. 630

55. 807

109. 916

3d3 (a 2H)4s a 4 H 5 20795. 65 1. 01 12

8492. 437

8602. 353

1. 50

1. 49 3d2 4s (a 2 F)4p: z 3 G° 3 21469. 534 118. 986

151. 223

0. 75 4 21588. 520 1. 05

3d3 (6 4 F)4s

b 3 F 2 11531. 812

108. 008

137. 000

0. 67 5 21739. 743 1. 21 3 11639. 820 1. 08 4 11776. 820 1. 26 3d2 4s (a 2 F)4p z 1 D° 2 22081. 15 1. 00

3d2 4s2 a4 G 4 12118. 46 0. 98 3d2 4s (a 2 F)4p z 4 F° 3 22404. 69 1. 00

3d3 (a 4 P)4s a 6 P 1 13981. 75

46. 72

77. 21

2. 50 3d2 4s (a 2 F)4y> z 4 G° 4 24694- 81 0. 97 2 14028. 47 1. 82 3 14105. 68 1. 66 3d2 4s (b 4 P)4p z 3 S° 1 24921. 19 1. 99

3d3 (a 2 G)4s a 3 G 3 15108. 153

48. 650

63. 597

0. 74 3d2 4s (5 4 P)4p z 5 S° 2 25102. 88 1. 93 4 15156. 803 1. 06 5 15220. 400 1. 21 3d2 4s(a 4 F)4p: y 3 F° 2 25107. 453

119. 783

161. 109 3 25227. 236 1. 06

3d2 4s (a 4 F)4p z 5 G° 2 15877. 18

98. 41

130. 49

161. 43

191. 20

0. 39 4 25388. 345 1. 21? 3 15975. 59 0. 93 4 16106. 08 1. 15 3d2 4s (a 4 F)4p: y*D° 1 25317. 842 121. 088

204. 794

0. 50 5 16267. 51 1. 25 2 25438. 930 1. 17 6 16458. 71 1. 33 3 25643. 724 1. 33

3d2 4s (a 4 F)4p z 5F° 1 16817. 19

58. 00

86. 23

113. 89

140. 13

0. 00 3d2 4s(5 4 P)4p z 3 P° 2 25493. 78 -43. 61 1. 47 2 16875. 19 1 25537. 39 1. 50 3 16961. 42 1. 26: 0 4 17075. 31 1. 34 5 17215. 44 1. 42 3d2 4s (b 4 P)4p: y 5 D° 0 25605. 03

30. 71

64. 21

97. 65

129. 22 1 25635. 74 3

3 (5 2 D)4s a 3 D 1 17369. 59

54. 52

116. 22

0. 49 2 25699. 95 23

17424. 11 17540. 331. 17

1. 34 34

25797. 60

25926. 82 1. 52

3d3 (a 2 P)4s

b 3 P 0 17995. 75

65. 79

83. 86

3d3 (5 4 F)4p

y 5 G° 2 26494- 37

70. 06

92. 98

115. 57

137. 71

0. 34 1 18061. 54 3 26564. 43 0. 91 2 18145. 40 4 26657. 41 1. 15 5 26772. 98 1. 25

3d3 (a 2H)4s a 3H 4 18037. 28

103. 97

51. 342

0. 80 6 26910. 69 1. 34 5 18141. 252 1. 02 6 18192. 594 1. 17 3d3 (6 4 F)4p: x 3 F° 2 26803. 462

89. 484

132. 721

0. 66 3 26892. 946 1. 06

3d3 (a 2 G)4sb 4 G 4 18287. 62 1. 02 4 27025. 667 1. 23

3d2 4s (a 4 F)4p 2 5D° 0 18462. 83

20. 03

42. 21

68. 92

101. 24

1. 65?

3d3 (b 4 F)4p x 3 D° 1 27355. 065

62. 972

62. 040

0. 51 1 18482. 86 2 274 18. 037 1. 17 2 18525. 07 1. 50 3 27480. 077 1. 36 3 18593. 99 1. 49 4 18695. 23 1. 51 3d3 (6 4 F)4p: y 3 G° 3 27499. 033

115. 660

135. 463

0. 75 4 27614. 693 1. 05

3d3 (a 4 P)4s c 8 P 0 18818. 23

7. 66

85. 66 5 27750. 156 1. 21 1 18825. 89 1. 54? 2 18911. 55 1. 54: 3d2 4s (6 4 P)4p z 5 P° 1 27665. 57

74. 62

147. 55 2 27740. 19 3 27887. 74
275

Ti I—Continued Ti I—Continued

Config. Desig.

3d2 4s (a 2 D)4p: y

1 D°

3d3 (6 4F)4p y

5F°

3d* a

6D

3d2 4s (6 4P)4p: w 3 D°

3d3 (b 2 F)4s a XF

3

d

3 (6 4F)4p 2

5 D°

3d2 4s (a 4F)4p: x 3 G°

3d2 4s (a 2 D)4p: v

3 D°

3d2 4s (b 2 G)4p: w 3 G°

3d2 4s (a 2 D)4p: y

3 P°

3d2 4s (6 2 G)4p 2

3H°

3d2 4s (a 2 D)4p 2/

X F°

3d2 4s (6 2 P)4p: x 3P°

3d2 4s (a 2 D)4p: w 3F°

3d2 4s (a 2 D)4p: 2 ip°

3d2 4s(5 2 G)4p v

3F°

3d4 d 3 P

3d2 4s(6 2 G)4p: 2

XH°

J Level Interval Obs. g Config. Desig. J Level Interval Obs. g

2 27906. 91 0. 98 3d2 4s (b 2 P)4p: y

ipo 1 34947. 02

1 28596. 45 42.

63. 85

37

88

69

0. 00 3d2 4s (b 2 P)4p: X 1D° 2 35035. 11 2 28638. 82 1. 01

3 28702. 70 1. 24 3d2 4s(6 2 P)4p y

3 S° 1 35439. 48 2. 18 4 28788. 39

107. 69 1. 34

5 28896. 08 1. 40 3d3 (a 2 G)4p y

3H° 4 35454- 099

105. 563

125. 526

0. 79

5 35559. 662 1. 04

0 28772. 86

18. 36. 53

7689

93

6 35685. 188 1. 17

1 28791. 62

2 28828. 51 3d3 (a 4 P)4p w 6 D° 0 35503. 40 24. 36

49. 38

75. 81

104. 56

3 28882. 44

69. 66 1 35527. 76 1. 51 4 28952. 10 2 35577. 14 1. 53

3 35652. 95 1. 46

12 29661.

29768. 272686 107.

143. 414606

0.

1. 51

16 4 35757. 51 1. 46

3 29912. 292 1. 34 3d2 4s(a 4F)5s e

5F 1 35959. 07

54. 50

82. 90

112. 45

142. 51

0. 00

2 36013. 57 1. 03?

3 29818. 31 3 36096. 47 1. 24

4 36208. 92 1. 34

0 29829. 16

26.

52.

78. 74.

1003

95

10

5 36351. 43 1. 42

1 29855. 26 1. 46

2 29907. 29 1. 50 3d2 4s (5 2 G)4p: y

X G° 4 36000. 25 1. 00

3 29986. 24 1. 49

4 30060. 34 1. 49 3d4 b

3 G 3 36065. 75

66. 46

68. 73

d 36132. 21

3 29914. 773 56 333 5 36200. 94 4

5 29971. 30039. 106

246 68. 140

1. 19 3d3 (a 4 P)4p y

5p° 1 36298. 43 42. 24

73. 91

2. 47

2 36340. 67 1. 81

1 31184

089

6 574 0. 51 3 36414- 58 1. 66

2 31190. 663

15. 351 1. 17

3 31206. 014 1. 34 3d3 (b 2 D)4p: w 3p° 0 37090. 65

82. 38

152. 44 1 37173. 03 1. 53

3 31373. 862

115.

139. 624

212

0. 75 2 37325. 47 1. 48

4 31489. 486 1. 05

5 31628. 698 1. 19 3d3 (a 4 P)4p y

5gO 2 37359. 13 1. 99

0 31685. 90

39.

80. 85

19

3d2 4s (a 4 F)5s e

3F 2 37538. 71

121. 26

164. 72

0. 67

1 31725. 75 1. 47 3 37659. 97 1. 11 2 31805. 94 4 37824. 69 1. 27

4 31830. 016

84.

99. 288251

0. 80 3d3 (a 2 G)4p V

3 G° 3 37554- 99

62. 94

72. 44

0. 77

5 31914• 304 1. 04 4 37617. 93 1. 05

6 32013. 555 1. 17 5 37690. 37 1. 20

3 32857. 76 0. 99? 3d2 4s (6 2 G)4p\ X ip° 3 37622. 63 0. 94

0 33085. U 5. 23. 4194

3

d

3 (b 2 D)4p: u 3p° 2 37654- 77

89. 19

108. 51

0. 65

1 33090. 55 1. 46 3 37743. 96 1. 08

2 33114• 49 1. 46 4 37852. 47 1. 24

2 33655. 898

24.

20. 264

735

0. 66 3d2 4s(b 2 P)4p: u 3D° 1 37851. 91

124. 87

182. 93

0. 53

3 33680. 162 1. 09 2 37976. 78 1. 14: 4 33700. 897 1. 26 3 38159. 71 1. 35

1 33660. 73 0. 94? 3d3 (a 2 P)4p z iS° 0 38200. 94

2 33980. 685

97. 126. 927

389

0. 63 3d3 {a 2 G)4p t 3]?° 2 38451. 29 93 09 0. 66

3 34078. 612 1. 10 3 38544- 38 12a 35 1. 08

4 34205. 001 1 . 23 4 38670. 73 1. 25

0 34170. 95

157. 207. 0108

3d3 (a 2H)4p z 3jo 5 38572. 75 96 28 0. 81

12

34327.

34535. 9604

67

38669. 38779. 03

97 110. 94 1. 021. 15

5 34700. 31 1 . 02 3d3 (b 2 D)4p: t 3D° 1 38654- 23 45 72 0. 54:

2 38699. 95

65. 01

3 38764. 96 1. 32
276

Ti I—Continued Ti I—Continued

Config.

3

3 (a 2 G)4p:

3

3 (6 2 D)4p

3

3 (6 4 F)5s

3

3 (a 2 H)4p

3d3 (a 2 P)4p

3d3 (6 4 F) 5s

3

3 (a 4 P)4p

3d?(b 2 D)4p

3d3 (a 2H)4p

3d3 (a 4 P)4p:

3d3 (a 2 P)4p

3d3 (a 2 P)4p

3d3 (a 2 G)4p:

3d2 4s (a 2 F)5s

3d3 (a 2 H)4p

3d2 4s (a 4 F)4d

3d2 4s (a 4 F)4d

3d3 (a2 G)4p:

3d2 4s (a 4F)4d

Desig.

x iG°

x

l F°

f

5 F

x

3H°

w 1 D°

/

3 F

s

3 D°

w 'F°

2 11 °

V

3 P°

r

3 D°

x

3 S° w iG°

y

1 H°

e *F u 3 G°

e

3 G

s

3 F°

e

3 H

v

1 F°

e

5 G

Level

38959. 53

39078. 00

39107. 25

39149. 26

39214. 38

39302. 36

39412. 78

89115. 99

89152. 14

89198. 89

89265. 80

39526. 89

39640. 98

39785. 94

89662. 15

89686. 10

89715. 51

40803. 04

40319. 80

40369. 76

40884. 58

40467. 04

40556. 07

40670. 60

40844 19 40844 19

40883. 80

41039. 98

41087. 31

41169. 82

41255. 44

41341. 62

41194. 42

41368. 86

41481. 13

41887. 43

41457. 62

41 624. 18

41515. 09

41556. 33

41615. 02

41585. 24

41714. 35

41757. 47

41818. 70

41903. 48

42019. 22

Interval

42. 01

65. 12

87. 98

110. 42

36. 15

46. 25

114. 09

144. 96

23. 95

29. 41

14. 82

82. 46

114. 53

173. 59

85. 62

86. 18

174. 44

112. 27

120. 19

166. 51

41. 24

58. 69

43. 12

61. 23

84. 78

115. 74

Obs. g

1. 02

0. 88 ?

1. 02

1. 18

1. 06:

0. 52

1. 31:

1. 05:

1. 03

0. 49

0. 95:

1. 03

1. 01

0. 73

1. 03

1. 19

0. 66

1. 09

1. 24

1. 12

1. 24

1. 34

Config.

3d2 4s (a 4 F)5p

3d2 4s (a 4 F) 4d

3d2 4s (a 4 F)4d

3d2 4s (a 4 F)4d

3d3 (a 2 P)4p:

3d2 4s (a 4 F)4d

3d2 4s (a 2 S)4p:

3d2 4s (a 4 F)4d

3d3 (a 2 H)4p:

3d3 (b 2 D)4

p

3d3 (6 4 F)4d

Desig.

w 3 H°

v

5 D°

e

5H

e

S D

9

3 F

u 3 P°

q

3 D°

p

3 D°

e

5 P

w iP0

g

5 F

r

3 F°

t> 1 G°

y

1 D°

u >D°

/

5H

0

3 D°

J Level

41780. 95

41895. 15

41995. 39

41822. 99

41854- 01

41906. 61 41985. 98

42092. 52

41823. 19

41917. 05

42018. 01 42123. 77

42205. 59

41871. 56

41901. 36

41958. 51

42052. 72

42184. 66

41871. 87

41988. 39

42107. 06

41928. 59

41943. 95

41959. 46

42146. 39

42206. 88

42811. 31

42193. 94

42269. 73

42376. 71 42611. 58

42724. 11 42858. 90

42927. 55

43034. 08

43080. 92

43148. 15

43231. 99

43330. 07

48467. 55

43588. 14

43744. 55

48674. 81

43710. 28

43799. 57

43843. 82

43901. 74

43971. 55

44051. 37

44134. 65

43975. 62

44079. 89

44233. 15

Interval

114. 20

100. 24

31. 02

52. 60

79. 32

106. 59

93. 86

100. 96

105. 76

81. 82

29. 80

57. 15

94. 21

131. 94

116. 52

118. 67

-15. 36

-15. 51

60. 49

104. 43

75. 79

106. 98

112. 53

134. 79

46. 84

67. 23

83. 84

98. 08

115. 59

161. 41

57. 92

69. 81

79. 82

83. 28

103. 77

153. 76

Obs. g

1. 15

1. 22

1. 28

1. 32

1. 64

1 . 00:

0. 95

0. 98:

0. 91

1. 11

1. 21

1. 29

1. 18?
277

Ti I—Continued Ti I—Continued

Config. Desig. J Level Interval Obs. g Config. Desig. J Level Interval

t 3 G° 3 3d2 4s (a 2 F)4d i

3 F 2

4 44162. U 3 47038. 16

156. 52 5 44875. 57 213. 13 4 47194. 68

2d3 (a 2 H)4p x m° 5 44163. 24 1. 03 3d3 (b 4F)6s i

5 F 19

3d3 (b 4 F)4d f

5 D 0 3

1 4 2 5 47777. 32

34

44254. 39

44381. 17

126. 78 3d2 4s (a 4 F)5d g

5H 3 47840. 62

72. 99

80. 71

112. 51

4 47913. 61 3d2 4s (a 2 D)5s e

X D 2 44581. 16 5

6 47994. 3248106. 83

q

3F° 2 44825. 26 97 74 7 48262. 83 156. 00

3 44923. 00 118. 02

4 45041. 02 3d2 4s (a 4 F)5d h

5 G 2 47870. 61

66. 18

81. 29

101. 39

114. 00

3 47936. 79

3

d

3 (a 4 P)4p w 3 S° n

3 D°

1

1

44857. 89

44966. 36 97 58

4

56

48018. 08

48119. 47

48233. 47

2 45063. 94 142. 40

3 45206. 34 3d2 4p2 J

5F 1 48058. 85

48. 57

101. 45

119. 94

133. 30

2 48107. 42 3d2 4« (a 2 S)4p: t 3 P° 0 45040. 70 50 03 3 48208. 87

12

45090. 73

45178. 06 87. 33 4

5 48328. 81 48462. 11 3d2 4s (a 2 F)4d e iH 5 45485. 35 3d2 4s (a 4 F)5d g

6 D 0

1 3 2

d

3 (6 4 F)4d? / ®G 2

3445689. 89

45711. 28 21. 39

45. 17

148. 28

3448059. 82

48186. 11 126. 29

5

6 45756. 45?

45904. 73 3cP(b 2 F)4p: u 4 F° 3 48365. 09

3d2 4s (a 2 F)4d /

3H 4 45721. 89

110. 61

127. 89

0. 80 3d2 4s (a 4 F)5d k

5F 1 5 45832. 50 1. 03 2 48519. 21

69. 07

84. 38

99. 07

6 45960. 39 1. 17 3 48588. 28

4 48672. 66

3d2 4s (a 4 F) 6s h

6 F 1 45764. 71

48. 30

80. 25

114. 36

150. 14

5 48771. 73

2 45813. 01

34

5

45893. 26

46007. 62

46157. 76

3d2 4p2 e

3 D 12

3

48724. 83

48724. 34

48839. 74 -0. 49

115. 40

3d2 4s (a 2F)4d e

4 G 4 46068. 04 3d2 4p2 h

5 D 0 48802. 32

57. 19

55. 56

109. 36

12. 03

1 48859. 51 3d2 4s (6 4 P)5s e

3 P 0

1 2

3 48915. 07

49024. 43

2 46244. 60 4 49036. 46

3d* (ft 2 F)4p: u J G° 4 46257. 67 0. 95 /

3 D 12 49571. 69

48. 03 3d2 4s (a 4 F)6s h

3 F 2

Q 3 49619. 72

O4 46530. 45 /

J D 2 50128. 08

3d2 4s (a 2 F)4d / *F 3 46650. 26 / 4 52125. 98

3d2 4p

2

fir 5 G 2 46943. 91

86. 37

109. 58

140. 83

166. 15

e

4 P 1 53663. 32

3447030. 28

47139. 86

5

6 47280. 69

47446. 84 Ti 11 (0 4 F1H) Limit 55138

June 1948.
278

Ti i Observed Terms

Config.

Is2 2

2 2

p

6 3s2 3

p

6 -j- Observed Terms

3d2 4

2 ja 2 P

a 4 D

o 3 F

a »G

3d4 {d 3 P

a

6 D

b

3 G

3d2 4p2 {

h

5 D

e

3 D

i *F g

5 G

ns (n> 4) np (n> 4)

3d2 4s (a *F)nx e, h ®F

e, h

3 F

2, V

5 D°

y

3 D°

2

5 F°

y

3 F°

2

5 G°

x 3 G°

3

2 (b 4 F)nx

{

o, /, i

5F

b,f 3 F

X 5 D°

x

3 D°

y

5 F°

X 3 F°

y

5 G°

y

3 G°

3d2 4s(a 2 F)nx

e »F

2

3 D°

2

1 D°

2

3 F°

2 IF 0 2

3 G°

2

1 G°

3d2 4s (a 2 D)nx

{ e

3 D

y

3 P°

2 1P°

V

3 D°

y

i v°

w 3 F°

yW°

3

3 (a 2 G)nx

{

a

3 G

b iG

t «F°

v

1 F°

V

3 G°

x 1 G°

y

y

3H°

1H°

3d2 (a 4 P)nx fa 5P

\e 3 P

y

5 S° w 3 S°

y

5 P°

V

3 P° w 5 D°

s

3 D°

3d2 (a 2 P)nx fb 3 P

\o IP

x 3 S°

z iS° u 3 P° r

3 D° w 1 D°

3d2 4s (b 4 P)nx {e 3 P

2

5 S°

2

3 S°

2

6 P°

2

3 P°

y

5 D°

w 3 D°

3

2 (b 2 ~D)nx

{ a

3 D

b ‘D

W 3 P°

X *P°

t

3 D°

u »D°

u

3 F° w 1 F°

3

3 (a 2 H)nx a 3H

a *H

u 3 G°

v

1 G°

X

X

3H° 2

3I° iH° z a°

3d2 4s (b 2 G)nx

{

v

3 F°

x iF° w 3 G°

y

1 G°

2

2

3H°

iH°

3d2 4s (b 2 P)nx

{

y

3 S° X3 P°

y

X P°

u

3 D°

x iD°

3d2 (b 2 F)nx a *F u

3 F° u1 G°

3d2 4s (o 2 S)nx

{

1 3 P°

W !P0

nd (n> 4)

3d2 4s (a 4 F)nx je 6P e, g

5 D g, k6F

g

3 F

e, h 5 G

e

3 G

e, g

5H

e

3H

3d2 (b 4F)nx / /

6 G? / ®H

3d2 4s (a 2 F)nx

{

i

3F

/

X F e *G

/

3 H

e m

*For predicted terms in the spectra of the Ti I isoelectronic sequence, see Introduction.
279

Tin

(Sc i sequence; 21 electrons) Z=22

Ground state Is2 2s2 2p6 3

2 3p6 3d2 4s 4Fi^

a

4F1H 110000 cm"1 I. P. 13.63 volts

This spectrum has been analyzed by Russell. His detailed analysis published in 1927

contains 50 terms derived from 164 multiplets, and includes 529 classified lines. The doublet

and quartet terms are connected by observed intersystem combinations.

The configuration assignments are of considerable theoretical interest, as indicated, for

example, in the references to the papers by Ufford, Racab, and Many listed below. Many

has interchanged the configurations given by Russell to the two low 4F terms. From a detailed study of the series relations Russell has recently shown conclusively that his original

assignments were correct, namely that the lower term (a 4F) has the configuration 3d2

(

a

3F)4s

and that the higher one (

b

4F) should be ascribed to 3d3

. Approximate ^-values have been determined by Catalan from the Zeeman patterns

observed by King and Babcock and quoted by Russell (1927). Very few patterns have been

resolved and consequently the observed gr-values differ from the theoretical ones by a few

percent in some cases. Colons indicate that X*S'-coupling has been assumed and a theoretical

<7-value introduced in order to utilize the observed data. It is highly desirable to extend this

work with the aid of Harrison’s unpubhshed Zeeman observations of titanium.

REFERENCES

H. N. Russell, Astroph. J. 66, 283 (1927); Mt. Wilson Contr. No. 344 (1927). (I P) (T) (C L) (G D) (Z E

} C. W. Ufford, Phys. Rev. 44, 732 (1933). G. Racah, Phys. Rev. 62, 438 (1942). A. Many, Phys. Rev. 70, 511 (1946).

H. N. Russell, Phys. Rev. 74, 689 (1948).

M. A. Catalan, unpublished material (June 1948). (Z E)

Ti II Ti II

Config. Desig. J Level Interval Obs. g Config. Desig. / Level Interval Obs. g

3d2 (a 3 F)4s a

4F 1/2 0. 00

93. 94

131. 53

167. 75

3d3 a 4P X 9363. 71

32. 05

122. 29

2. 63

2/2 3y2 4H

93. 94

225. 47

393. 22

IX

2X

9395. 76

9518. 05

1. 74

1. 60: 3d3 a

2 P X 9850. 90

125. 02 0. 66

3d3 b

4 F IX 907. 96

75. 84

103. 41

128. 37

ix 9975. 92 1. 33

2y2 3H

983. 80

1087. 21 3d2 (a 3 P)4s 6

4P }'2 9872. 87

57. 87

94. 00

2. 60

4/2 1215. 58 1/2 9930. 74 1. 72:

2/2 10024. 74 1. 60: 3d2 (a 3 F)4s a

2 F 2/2 4628. 61

268. 99 0. 86: 3/2 4897. 60 1. 14: 3d3 6

2 D 1/2 2/2 12628. 77

12758. 15 129. 38 0. 80:

1. 20: 3d2 (a >D)4s a 2 D ix 8710. 47

33. 80 0. 80

2X 8744. 27 1. 20: 3d3 a

2H 4/2 12676. 99

97. 82 0. 91:

5/2 12774. 81 1. 09: 3d3 a 2 G 3y2 8997. 69

120. 46 0. 89: 4x 9118. 15 1. 11: 3d2 (a J G)4s 6

2 G 4/2 15257. 53 -8. 07 1. 11:

1 3/2 15265. 60 0. 89:
Ti II

Continued Ti II

Continued

Config. Desig. J Level Interval Obs. g

3d2 (a 3 P)4s 6 2 P y2 16515. 79

109. 46 0. 66 1 X 16625. 25 1 . 33

3d3 b 2 F 3/2 2/

20891. 88

20951. 77

-59. 89 1 . 0. 14: 86: 3d2 (a iS) 4

a 2 S /2 21338. 00: 3d 4s2 c 2 D 1/2 24961. 34 231. 70 0. 80:

2/2 25193. 04 1 . 20: 3d2 (a 3F)4p z 4 G° 2/2 29544- 87 190 08 0. 57:

3/2 29734- 45 233. 63 0. 98:

4/2

5/2 29968. 08

30240. 68 272. 60

3d2 (a 3 F)4p 2 4F° 1/2 30836. 52

122. 18 0. 40: 2/ 30958. 70

154.

187. 9131 1 . 03: 3/ 31113. 61 1 . 24: 4/ 31300. 92

3d2 (a 3F)4p z 2 F° 2/ 31207. 44 283. 38 0. 86: 3/ 31490. 82 1 . 14: 3d2 (a 3 F)4p 2 2 D° I /2 31756. 50

269. 00 0. 92

2/ 32025. 50 1 . 20

3d2 (a 3 F)4p 2 4 D° 32532. 38 70 13 0. 00

1/2 32602. 51

95.

69. 4308 1 . 20

2/2 32697. 94 1 . 37

3/2 32767. 02 1 . 43: 3d2 (a 3 F)4p 2 2 G° 3/2 34543. 36

205. 14 0. 89: 4/ 34748. 50 1. 11: 3d2 (a 3 P)4p 2 2 S° 37430. 55 2. 09

3d2 (a

x D)4p 2/ 2 D° 1/2 39233. 44 243. 43 0. 80: 2/ 39476. 87 1 . 20: 3d3 (a 3 D)4p 2 2P° 1/2 39602. 90 -71. 74 1 . 21 y2 39674- 64 0. 67: 3d2 (a x D)4p y 2 F° 2 / 39926. 83

147. 88 0. 86: 3/ 40074. 71 1. 14: 3d2 (a 3 P)4p 2 4 S° 40027. 28

3d2 (a 3 P)4p

y 4 D° X 40330. 25

95. 15655

00 1/2 40425. 80 2/ 40581. 80

216. 57 3/ 40798. 37

3d2 (a 3 P)4p 2 4 P° H 41996. 74

72. 139. 1199 1/2 42068. 85 2/ 42208. 84

3d2 (a 1 G)4p

y 2 G° 3/ 43740. 77

40. 22 0. 89: 4/ 43780. 99 1 . 11: 3d2 (a 3 P)4p x 2 D° 2/ 44902. 42 -12. 38 1 . 20: 1 X 44914- 80 0. 80: 3d2 (a 3 P)4p y 2 P° X 45472. 89

76. 01 0. 66:

1/2 45548. 90 1 . 33: 3d2 (a 1 G)4p 2 2H° 4/ 45673. 75

234. 81 5/ 45908. 56

Config. Desig. J Level Interval Obs. g

3d2 (a X G)4p x 2 F° 3/

2/

47466. 80

47625. 17

-158. 37 1. 14

0. 86

3d 4s (a 3 D)4p s *D° X

1/2 2/2

3/2

52329. 78

52458. 98

52471. 48

52631. 07

129. 20

12. 50

159. 59

3d 4s (a 3 D)4p

x 2 P° X

1/2 53121. 48

53128. 17 6. 69

3d 4s (a 3 D)4p

w 2 D° 2/2

1/2 53554. 90

53596. 70

-41. 80

3d 4s (a 3 D)4p

y 4 P° X

1/2 2/2

56223. 13

56249. 11 56325. 94

25. 98

76. 83

3d 4s (a 3 D)4p

w 2 F° 2/4 3/

59321. 79

59467. 81

146. 02

3d2 (a 3 F) 5s e 4 F 1/2 2/

3/

4/2

62180. 02

62271. 25

62409. 58

62594. 27

91. 23

138. 33

184. 69

3d2 (a 3 F) 5s e 2 F 2/2 3/

63168. 23

63444. 76 276. 53

3d2 (a 3 F)4d e 4 G 2/

3/

4/

5/

64884. 65

64977. 57

65094. 29

65241. 60

92. 92

116. 72

147. 31

3d2 (a 3 F)4d e 4H 3/

4/

5/

6/2

65184. 72

65307. 45

65445. 85

65589. 10

122. 73

138. 40

143. 25

3d2 (a 3 F)4d / 2F 2/

3/

65312. 71

65458. 65 145. 94

3d2 (a 3 F)4d e 4 D X

1/2 2/

3/

66767. 43?

66816. 49

66937. 70

66996. 67

49. 06

121. 21

58. 97

3d2 (a 3 F)4d e 2 G 3/

4/

67604. 20

67820. 87 216. 67

3d2 (a 3 F)4d e 2 H 4/

5/

68328. 95

68582. 34 253. 39

3d2 (a 3F)4d / 4 F 1/2 2/

3/

4/

68767. 66

68845. 14

68950. 39

69081. 35

77. 48

105. 25

130. 96

3d 4s (6 *D)4p

v 2 D° ix

2/2 69327. 32

69622. 15 294. 83

3d 4s (6 1 D)4p

v 2 F° 2/

3/

70606. 35

70893. 00 286. 65

Ti hi (a 3 F2) Limit 110000

June 1948.
281

Ti ii Observed Terms*

Config.

Is 2 2s2 2p6 3s2 3p 6 +

Observed Terms

3d3 {

a

4 P

a 2 P

6

4 F

b

2 D b2 F a2 G a2H

3d 4s2 c

2 D

ns (n> 4) np (n>4) nd (n>4)

3d2 (a 3 F)nx

{

a, e

4 F

a, e

2 F

z

4 D°

z

2 D°

z

4 F°

z

2 F°

z

4 G°

z

2 G°

e

4 D /4 F e

4 G

/

2 F e

2 G

e

4 H

e

2H

3d2 (a 1 D)nx a

2 D z

2 P° y

2h° y 2 F

0

3d2 (a 3 P)nx

{

b

4 P

b

2 P

z

4 S°

z

2 S° o

o y

4 D°

x 2 D°

3d2 (a 1 S)na; a

2 S 3d2 (a 1 G)nx b

2 G x

2 F° y2 G° z2H°

3d 4s (a 3 D)nx

{

y

4 P°

X

2 P°

x

4 D° w 2 D° w 2 F°

3d 4s(b 1 D)nx v

2 D° v2 F°

*A chart of predicted terms in the spectra of the Sci isoelectronic sequence is given in the Introduction. Owing to the difference in binding energies of the 3d and 4s electrons along this sequence, the charts of observed and predicted terms are not similarly arranged for Ti n.

Ti III

(Ca i sequence; 20 electrons) Z—22

Ground state Is2 2s2 2_p

6 3s2 3jp6 3d2 3F2

a

3F2 227000 cm"1 I. P. 28.14 volts

The analysis is by Russell and Lang who have classified 84 lines in the interval between

1002 A and 2984 A.

The singlet and triplet terms are connected by observed intersystem combinations.

REFERENCE

H. N. Russell and R. J. Lang, Astroph. J. 66, 25 ; Mt. Wilson Contr. No. 337 (1927). (I P) (T) (C L)
282

Tim Tim

Config. Desig. J Level Interval Config. Desig. J Level Interval

3d2 a

2 F 2

3

4

0.0

183. 7

421. 9

183. 7

238. 2

3d(2 D)4p

3d(2 D)4p

2 *F°

2 IP0

3

1

83116. 58

83795. 70

3d2 a *D 2 8472. 6 3d(2 D)4d e

3 G 3 129096. 3

159. 7 4 129256. 0

3d2 a

3 P 0 10536. 4

67. 1 117. 6

5 129472. 6

216. 6

1210603. 5

10721. 1 3d(2 D)4d e

3 D 12 129873. 9

145. 6 3d2 a »S 0 14052. 7? 3 130019. 5 3d2 a *G 4 14398. 5 3d(2 D)4d e

3 S 2 132854. 6 3d(2 D)4s a

3 D 1 38063. 50

134. 48

227. 21

3d(2 D)4d e

3 F 2 133067. 2

142. 5

164. 0 2

3 38197. 98

38425. 19

34133209. 7

133373. 7

3d(2 D)4s b 2 41703. 65 3d(2 D)4d e

3 P 0 135543. 8

58. 6

121. 7

1 135602. 4

3d(2 D)4p 2 ID0 2 75197. 43 2 135724. 1 3d(2 D) 4p 2

3 D° 1 76999. 70 166 95 4s(2 S)4p y

3 P° 0 137262 228

481

2

3

77166. 65

77424- 20 257. 55 12 137490137971

3d(2 D)4p 2

3 F° 2 77421. 48 324 70 3 Ti iv (2 D)iH) 77746. 18

412. 53 4 78158. 71 Limit 227000

3d(2 D)4p 2

3 P° 0 80943. 95

1 80938. 02

85. 58

2 81023. 60

June 1948.

Ti hi Observed Terms*

Config.

Is2 2s2 2p6 3s2 3

p

8 +

Observed Terms

3d2 / a

3 P a 3 F

[a X S a

X D a J G

ns (ri> 4) np (n> 4) nd (ri> 4)

3d(2 D)wz f a

3 D

1 b m

2

3 P° 2

3 D° 23 F°

2

1 P° 2 iD0 2

X F°

e

3S e

3 P e3 D e

3 F e3 G

4s(2 S)rw; O Ph CO >5

*A chart of predicted terms in the spectra of the Ca i isoelectronic sequence is given in the Introduction. Owing to the change in binding energies of the 3d and 4s electrons along this sequence, the arrangement of the charts of observed and predicted terms is not

identical. In Ti hi no primes are used to indicate higher limits, and the prefixes a, b . . . e, z, y replace those indicating the running

electron.
Ti IV

283

(K i sequence; 19 electrons) Z=22

Ground state Is2 2s2 2jp6 3s2 3p6 3d

2T>iy

3d

2T>iy2 348817.8 cm-1

I. P. 43.24 volts

The analysis is from Russell and Lang, who have revised and extended the early work of

Gibbs and White. Thirty-one lines have been classified in the range between 423 A and 5492 A.

REFERENCES

R. C. Gibbs and H. E. White, Proc. Nat. Acad. Sci. 12, 598 (1926). (T) (C L) H. N. Russell and R. J. Lang, Astroph. J. 66, 15 (1927); Mt. Wilson Contr. No. 337 (1927). (I P) (T) (C L)

Ti IV Ti IY

Config. Desig. J Level Interval Config. Desig. J Level Interval

3p 6 0S)3d 3d 2D 1/2 2/

0. 0

384. 3

384. 3 3p6 (

1 S)5d 5d2 D 1/2 2/

258827. 2 258866. 7

39. 5

3p6

(

1 S)4s 4s 2 S 80378. 6 3p6

(

1 S) 6s 6s 2 S K 265835. 8

3p 6 (

1 S)4p 4p 2 P° /

1/2 127912. 5

128780. 9

818. 4 3p6 (

1 S)5^ 5<72 G / 3/

l 4/ } 278501. 1

3p6

(

1 S)4d 4d 2 D 1/

2/

196794. 8

196880. 5

85. 7 6h

2 H° J 4/

l 5H } 800012.

5

5s 2 S / 212395. 8 3p6 (

1 S) 7h 7h

2 H° J 4H

l 5% | 812973. 5

3p6

(

1 S) 5p 5p

2 P° H

1/2 2/

3/

230597. 6 280918. 4

315. 8

3p6 (

1 S)4/ 4/ 2 F° 286125. 3 Ti v (!So) Limit 348817.

8

286182. 5

7. 2

May 1948.
(Ai sequence; 18 electrons) Z=22

Ground state Is2 2s2 2p6 3s2 3p6

3p6 % 805500 cm-1

I. P. 99.8 volts

Four lines are classified in the region between 163 A and 228 A, as combinations with the

ground term. The levels in the table are from the 1937 reference, and all values have been

rounded off in the last places.

For convenience, the Paschen notation has been added by the writer in column one of

the table, under the heading “A i”. As for Ai, the jZ-coupling notation in the general form

suggested by Racah is here introduced, although ZS'-designations, as indicated in column two

under the heading “Authors”, are perhaps preferable for the terms thus far identified.

REFERENCES

P. G. Kruger and S. G. Weissberg, Phys. Rev. 48, 659 (1935). (C L)

P. G. Kruger, S. G. Weissberg and L. W. Phillips, Phys. Rev. 51, 1090 (1937). (I P) (T) (C L)

G. Racah, Phys. Rev. 61, 537 (L) (1942).

TiV

A i Authors Config. Desig. J Level

Ipo 3

p

8 iS 3p® 3p« iS 0 0

3p8 (*PlH)4s 4s [1*43° 2

1«4 3p8 4s *P° 1 486880

3p8

( 2P&)4s 4s'[ y2]° 0

ls2 3p 8 4s *P0

1 448780

3p8

(

2 Pfo)5s 5s [ Jfl° 2 3p8 5s *P° 1 608090

3p8

(

2 P£)5s 5s'[ y2)° 0

2sa 3p8 5s *P° 1 612970

Ti vi (*P!h) Limit 805500

Ti vi (*P£) Limit 811330

May 1948.
285

Ti VI

(Cl i sequence; 17 electrons) Z—22

Ground state Is2 2s2 2p6 3s2 3p6 2P\y2

3p6 2P^ 000000 cm"1 I. P. 120 volts

All of the terms except 3p6 2S are from the paper by Edl6n. Twelve lines in the region

between 182 A and 524 A have been classified as combinations from the ground term. Edlen

has estimated the value of the limit by extrapolation along the isoelectronic sequence, as indicated by brackets in the table. His unit, 103 cm-1

, has here been changed to cm-1

. REFERENCES

S. G. Weissberg and P. G. Kruger, Phys. Rev. 49, 872 (A) (1936). (C L)

B. EdlSn, Zeit. Phys. 104, 407 (1937). (I P) (T) (C L)

Ti VI

Config. Desig. J Level Interval

3s2 3p

5 3p5 2po i X

Yt 0

5840

-5840

3s 3p

6 3p6 2S % 196620

3s2 3p4 (*P)4s 4s 4 P 2y2 IX

X

495390

3s2 3p4

(

3 P)4s 4s 2 P IX

X

502580

506440 -3860

3s2 3p4 (»D)4s 4s' 2D 2y2 IX

518820

518930

-110

3s2 3p4 0S)4s 4s" 2S X 549000

Ti vii («P2) Limit [966000]

January 1948.
286

Ti VII

(S i sequence; 16 electrons) Z=22

Ground state Is2 2s2 2p

6 3s2 3p4 3 P2

3p4 3 P2 1136000 cm-1 I. P. 140.8 volts

All the terms are from Edlen’s paper except 3p

5 3P°, which is from Kruger and Pattin,

who have estimated the value entered in brackets in the table. Twenty-four lines have been

classified in the region between 164 A and 200 A. The limit is from Edlen, who has extra- polated it from isoelectronic sequence data.

The singlet and triplet terms are connected by two observed intersystem combinations.

The unit adopted by Edlen, 103 cm-1

, has here been changed to cm-1

. REFERENCES

B. Edl6n, Zeit. Phys. 104, 188 (1937). (I P) (T) {G L)

P. G. Kruger and H. S. Pattin, Phys. Rev. 52, 622 (1937). (T) (C L)

Ti VII Ti VII

Config. Desig. J Level Interval Config. Desig. J Level Interval

3s2 3p4

3s2 3p4

3

p

4 3 P

3

p

4 *D

2

10

2

0

4540

5900

24120

-4540

-1360

3s2 3p3

(

2 D°)4s

3s2 3p3

(

2 P°)4s

4s' 1 D°

4s" 3 P°

20

12

592930

607550

607990

609120

440

1130

3s2 3p4 3p

i 4 S 0 54770 3s2 3p3

(

2 P°)4s 4s" *P° 1 614790

3s 3p

5 3p5 3 P

0 2 196260 -3800

-[2140] 10

200060

[202200]

564^40

Ti viii (

4 Sfo) Limit 1136000

3

2 3p3

(

4 S°)4s 4s 3 S° 1

3s2 3p3

( 2 D°)4s 4s' 3 D° 12

3

586100

586320

587000

220

680

January 1948.
Tivm

287

(Pi sequence; 15 electrons) Z=22

Ground state Is2 2s2 2_p

6 3s2 3p3 4S°^

3p3 4S°h cm-1

I. P. volts

The analysis is incomplete. Kruger and Pattin have observed 15 lines between 150 A

and 162 A and arranged them in five multiplets that give intervals consistent with those

found in related isoelectronic spectra.

By a rough extrapolation of 3p

3 4S°^— 3p3 2D°^ along the isoelectronic sequence the

writer has estimated the value of 3^3 2D entered in brackets in the table. She has calculated

the terms listed below from the observed multiplets. The uncertainty x in the estimated

position of the doublet terms relative to the quartets may well exceed ± 500 cm-1

. REFERENCE

P. G. Kruger and H. S. Pattin, Phys. Rev. 52, 624 (1937). (C L)

Ti vin

Config. Desig. J Level Interval

3s2 3p

3 3p3

S° 1 % 0

3s2 3

p

3 3

p

3 2 D° i H [88000]+

1080

2% 84080 +x

3s2 3

p

3 3

p

3 2 P° % 55000 1460

1 X 56460

3s2 3p2

(

3 P)4s Co 3 y2 660130 2720

3650 i % 662850

2% 666500

3s2 3p2 (

3 P)4s 4s 2P y* 672220 +x 4230

i X 676450 +x

3s2 3p2

(

1 D)4s 4s' 2 D 2y2 691260 +x -230

1 H 691490 +x

December 1947.
(Si i sequence; 14 electrons) Z=22

Ground state Is2 2s2 2p6 3s2 3^?

2 3P0

3p2 3 P0 1560000 cm-1

I. P. 193 volts

The analysis is very incomplete, but seven lines have been classified by Philli ps in the

interval 281 A to 341 A as combinations among three triplet terms. He states that the interval 3p

2 3P0 —

p

2 3Pi of the ground term has been extrapolated along the sequence, since no

combinations from the ground state 3p

2 3P0 are known. The first interval is, therefore, entered in brackets in the table, as well as his estimated value of the limit.

REFERENCE

L. W. Phillips, Phys. Rev. 55, 709 (1939). (I P) (T) (C L)

Ti IX

Config. Desig. J Level Interval

3s2 3p

2 3p2 3 P 0

12

0

3100

7310

[3100]

4210

3s 3p

3 3p3 3 S° 1 299920

3s2 3p(2 P°)3d 3d 3P° 2

10

352460

356800

358380

-4340

-1580

Ti x ( 2 P£) Limit --- [1560000]

October 1947. Ti X

(A1 i sequence; 13 electrons) Z=22

Ground state Is2 2s2 2p6 3s2 3p

2P&

3p

2P£ cm-1

I. P. volts

This spectrum has not been analyzed, but Edl6n has classified two lines as follows:

I. A. Int. Wave No. Desig.

101. 355

102. 107

[2]2

986630

979360 ^3p

2P°— 4d 2 D

His unit, 108 cm-1

, is here changed to cm-1

. REFERENCE

B. Edl6n, Zeit. Phys. 103, 540 (1936). (C L)

December 1947.
Ti xe

289

(Mg i sequence; 12 electrons) Z—22

Ground state Is2 2s2 2p

6 3s2 'So

3s2 'So 2142000 cm-1

I. P. 266 volts

Edlen has classified 14 lines in the region between 71 A and 126 A. No intersystem combinations have been observed and the triplet terms are not all connected by observed combinations. He has determined the relative positions of the various groups of terms and also

the ionization potential by extrapolation along the isoelectronic sequence. His estimated

value of the limit is entered in brackets in the table.

His unit, 103 cm-1

, has here been changed to cm-1

. REFERENCE

B. Edl6n, Zeit. Phys. 103, 536 (1936). (I P) (T) (C L)

Ti xi Ti XI

Config. Desig. J Level Interval Config. Desig. J Level Interval

3s2 3s2 iS 0 0 3s(2 S)4/ 4/ 3 F° 2

o

3s(2S)3p 3p *P° 0 172870+x 2550

5630

4 1297420+x

1 174920 +z

3s(2S)5d

. 2 180550+x 5d 3 D 19

3s(2S)3d 3d 3 D 1o3 1577370+z

3 504150+z 3s(2S)5/ 5/ 8F° 2

q

3s(2 S)4s 4s *S 1 1050030 +x 4 1603570+x

3s(2 S)4p

3s(2S)4d

4p

iP0

4d *D

1 1189970

1 1243080+x

1243350+x 270

420

Ti xn (2Sh) Limit [2142000] 2

3 1243770+z

August 1947.

Ti xn

(Na i sequence; 11 electrons) Z=22

Ground state Is2 2s2 2p6 3s 2S^

3s 2Sh 2351530 cm"1 I. P. 291.47 volts

Edlen has classified 16 lines in the interval 60 A to 116 A, and extrapolated the absolute

value of the ground term from isoelectronic sequence data.

The unit adopted by Edlen, 103 cm-1

, has here been changed to cm-1

. REFERENCE

B. Edl6n, Zeit. Phys. 100, 621 (1936). (I P) (T) (C L)
290

Tixn

Config. Desig. J Level Interval

3s 3s 2 S y2 0

3V 3p

2 P° V* 1 X

208S00

216960 8660

3d 3d 2 D iy2 2/2 502370

503260 890

4s 4s 2S y2 1133370

4p 4p

2 P° y2 iy2 1214330

1217670 3340

4d 4d 2 D

2y2 1321380

1321840 460

4/ 4/ 2F° 2y2 3y2 1360770

1360930 160

June 1947.

Ti xn

Config. Desig. J Level Interval

5p 5p 2P° y2/ 1645820

1490 iy2 1647310

55d 2 D i y2 1697530

210

2/2 1697740

5/ 5/ 2F° 2/ 1717270

140 3/2 1717410

6/ 6/ 2F° 2%

3/ 1911470

Ti xiii OSo) Limit 2351530

Ti XIII (Ne i sequence; 10 electrons) Z=22

Ground state Is2 2s2 2p6

2p6 xSo 6360600 cm-1

I. P. 788.4 volts

Edlen and Tyren have classified five lines in the interval between 23 A and 26 A, as combinations with the ground term. Their absolute term values are based on extrapolation

along the Ne i isoelectronic sequence. Their unit, 103 cm-1

, has here been changed to cm-1

. As for Ne i, the ^7-coupling notation in the general form suggested by Racah is introduced.

REFERENCES

B. Edl6n and F. Tyr6n, Zeit. Phys. 101, 210 (1936). (I P) (T) (C L)

G. Racah, Phys. Rev. 61, 537 (L) (1942).

Ti XIII

Authors Config. Desig. J Level

2p

1 S0 2p6 2p6 iS 0 0

2pH2 Pw)3s 3s [l/2]° 2

3s 2 P1 1 3709200

2p5

(

2 P£)3s 3s' [ y2 ]° 0

3s x Pi 1 3753600

2p*(2 PiH)3d 3d [ y2)° 0

3d 2 P! 1 4168200

3d *PX // 3d [1 y2 ]° 1 4219800

3d 2 DX 2p5

(

2 P£)3d 3d'[iy2y 1 4281600

Ti xiv ( 2PJh) Limit 6360600

Ti xiv ( 2 P£) Limit 6407500

April 1947.
VANADIUM

VI

23 electrons Z~23

Ground state Is2 2s2 2p6 3s2 3^>

6 3d3 4s2 4Fi^

a

4Fi^ 54361 cm-1

I. P. 6.74 volts

The arc spectrum of vanadium has been studied since 1923. The early contributions of

Meggers, Laporte, Lande, Bechert, Sommer, and many others culminated in the extensive

analysis of this highly complex spectrum published by Meggers and Russell in 1936. They

list 60 doublet terms, 60 quartet terms, and 28 sextet terms from 634 multiplets, and give

2186 classified lines extending from 2082 A to 11911 A. The terms of all three multiplicities are connected by observed intersystem combinations.

The configuration assignments of many of the odd doublet and quartet terms are extremely

uncertain and a number of terms are unassigned. No limit assignment has been attempted

for the sextet triad x

6P°, w 6D°, and x

6 F°, which comes from 3d4 5p, and for two quartet

triads which may arise from 3d

3 4s 5p. Rohrlich has suggested that some of the configurations

of odd terms from d? sp and d

4 p should be interchanged.

Zeeman observations by Babcock of more than 900 lines provided the large array of

^-values which greatly facilitated the analysis. Much of this material was generously furnished in manuscript form for inclusion in the 1936 paper. A discussion of the (/-sums by

Russell and Babcock appears in the 1935 reference below.

Six terms, and miscellaneous odd levels were added by the writer in 1939 from additional

observations of the spectrum between 1848 A and 2173 A.

REFERENCES

H. N. Russell and H. D. Babcock, Zeeman Verhandelingen p. 286 (Martinus Nijhoff, The Hague 1935). (Z E)

W. F. Meggers and H. N. Russell, J. Research Nat. Bur. Std. 17, 125, RP906 (1936). (I P) (T) (C L) (Z E)

C. E. Moore, Phys. Rev. 55, 710 (1939). (T) (C L)

W. F. Meggers, J. Opt. Soc. Am. 36, 431 (1946). (Summary hfs.) F. Rohrlich, Phys. Rev. 74, 1393 (1948).
292

Vi VI

Config. Desig. J Level Interval Obs. g 3

3 4s2 a 4 F 1/2 0. 00

137. 38

186. 04

229. 60

0. 40

2/2 137. 38 1. 01

3/2 323. 42 1. 20

4/2 553. 02 1. 28

3d* (a ®D)4s a 6D / 2112. 32

40. 88

66. 93

91. 24

113. 52

3. 29

1/2 2153. 20 1. 82

2/2 2220. 13 1. 61

3/2 2311. 37 1. 53

4^2 2424. 89 1. 52

3d* (a 6D)4s a 4 D Z 8412. 94

63. 26

102. 32

137. 20

0. 00

1/2 8476. 20 1. 19

2/2 8578. 52 1. 35

3/2 8715. 72 1. 39

3d3 4s2 a 4 P Z 9544. 54

92. 42

187. 62

2. 59

1/ 9636. 96 1. 70

2/2 9824. 58 1. 55 3d3 4s2 a 2 G 3/2 4/

10892. 50

11100. 65 208. 15 0. 88

1. 13 3d3 4s2 a 2 P I /2 13801. 53 -9. 37 1. 20 / 13810. 90 0. 64

3d3 4s2 a 2 D 1/2 14514. 75 34.08 0. 97

2/2 14548. 83 1. 17 3d4 (a 3H)4s a 4H 3/ 14910. 04

39. 26

51. 54

62. 10

0. 65

4/2 14949. 30 0. 94

5/2 15000. 84 1. 10 6/ 15062. 94 1. 18 3d4 (a 3 P)4s b 4P / 15078. 25

192. 17

301. 48

2. 60 1 

15270. 42 1. 68

2/2 15571. 90 1. 54

3d3 4s2 a 2H 4/2

5/2 15103. 77

15264. 83 161. 06 0. 90

1. 07

3d4 (6 3F)4s

b 4 F 1/2 15664. 75

24. 05

35. 42

46. 50

0. 39

2/2 15688. 80 1. 05

3/ 15724. 22 1. 22

4/2 15770. 72 1. 31 3d3 4s (a 5F)4p z 6 G° 1/2 16361. 45 88 40 0. 00

2/2 16449- 85 122 69 0. 78

3/2 16572. 54 156. 21

188. 40

219. 29

1. 10 4/ 16728. 75 1. 22

5/ 16917. 15 1. 26

6/ 17136. 44 1. 43

3d4 (a 3 G)4s a 4 G 2/ 17054. 87

62. 05

65. 06

60. 07

0. 59

3/ 17116. 92 0. 96

4/

5/

17181. 98

17242. 05

1. 14

1. 27

3d3 4s (a ®F)4p 2 6D° / 18085. 82

40. 45

71. 81

104. 19

135. 80

3. 20

1/2 18126. 27 1. 76 2H 18198. 08 1. 58

3/2 18302. 27 1. 56

4/2 18438. 07 1. 55

3d3 4s (a ®F)4p g epo z 18120. 12

53. 94

84. 83

113. 57

141. 00

166. 66

-0. 44

1/2 18174. 06 1. 14

2/2 18258. 89 1. 28

3/2 18372. 46 1. 28

4>'2 5/

18513. 46

18680. 12

1. 38

1. 42

3d4 (a 3P)4sb 2P Z 1 18805. 05

384. 23 0. 67

1/2 19189. 28 1. 37

Config. Desig. J Level Interval

3d4 (a 3H)4sb 2H 4/

5/

19023. 47

19145. 13 121. 66

3d4 (6 3F)4s a 2F 2/

3/

19026. 34

19078. 15 51. 81

3d® a 6S 2/ 20202. 49

3d3 4s (a *F)4p 2 4 D° Z

1/2 2/

3/

20606. 43

20687. 75

20828. 48

21032. 52

81. 32

140. 73

204. 04

3d4 (a 3 D)4s 6 4D 3/

2/

1ZZ

20767. 57

20789. 13

20812. 99

20830. 20

-21. 56

-23. 86

-17. 21

3d4 (a 3 G)4s

b 2 G 4/

3/

21603. 17

21646. 39 -43. 22

3d3 4s (a 3 F)4p z 4 G° 2/

3/2

4}'2

5/

21841- 45

21963. 50

22121. 17

22313. 99

122. 05

157. 67

192. 82

3d3 4s (a 3 F)4p z 4 F° 1Z

2/

3/2 4/

23088. 06

23210. 56

23353. 09

23519. 84

122. 50

142. 53

166. 75

3d3 4s (a 3 F)4p z 2 D° 1Z

2/

23608. 80

23935. 15 326. 35

3d4 (a ®D)4p z 6P° 1Z

2Z

3/2

24648. 10

24727. 85

24838. 56

79. 75

110. 71

3d4 (a ®D)4p Z 4 P° z

1/2 2Z

24770. 62

24915. 16

25130. 96

144. 54

215. 80

3d4 (a ®D)4p

y 6F° z

1/2 2Z

3Z

4^'2 5/

24789. 36

24830. 18

24898. 73

24992. 88

25111. 50

25253. 53

40. 82

68. 55

94. 15

118. 62

142. 03

3d4 (a ®D)4p

y 4F° iz

2/

3/

4Z

25930 51

26004- 32

26122. 04

26171. 96

73. 71

117. 82

49. 92

3d3 4s (0 3 F)4p z 2 G° 3/

4Z

26021. 89

26344 94

323. 05

3c( 4 (a ®D)4p

y 4 D° z

iz

2/2 3/2

26182. 60

26249. 48

26352. 59

26480. 28

66. 88

103. 11

127. 69

3d4 (a ®D)4p

y 8D° z

1/2 2/2 3/

4/2

26397. 36

26437. 68

26505. 88

26604- 77

26738. 31

40. 32

68. 20

98. 89

133. 54

3d3 4s (a 3 F)4p z 2 F° 2/2

3/2 27187. 77

27470. 88 283. 11

3d3 4s (a ®P)4p

x ®D° z

iz

2/2 3/

4/2

28313. 68

28368. 76

28462. 15

28595. 64

28768. 13

55. 08

93. 39

133. 49

172. 49

Obs. g

0. 91

1. 08

0. 86

1. 14

-0. 04

1.

21

1.

35

1. 45

1. 45

1. 25

1. 20

0. 10

1. 11

0. 86

0. 55

0. 96

1. 16

1. 24

0. 39?

0. 98?

1. 23

1. 31

0. 76

1. 32?

2. 34

1. 85

1. 67

2. 54

1. 71

1. 59

-0. 58

1. 02

1. 23

1. 37

1. 41

1. 41

0. 42

0. 98

1. 15

1. 23

0. 92

1. 13 -0. 06

1. 17

1. 34

1. 39

3. 25

1. 86

1. 59

1. 58

1. 50

1. 01?

1. 01

3.

23

1. 82

1. 58

1. 52

1. 47
V I—Continued V I—Continued

Config. Desig. J Level Interval Obs. g

z

4 S° 1/2 £80*1. 27

3

d

3 4s (a 5 P)4p y

6 P° 1/2 2/2 3*4

29202. 80

29296. 48

2941 8. 17

93. 63

121. 74

2. 32

1. 76

1. 62

3d* 4s (c *P)4p y

4 P° /

1/2 2/2

80021. 57

30094- 52

SO120. 78

72. 95

26. 26

2. 67

1. 74

1. 67

3d* 4s (6 *G)4p? y

4 G° 2/2

3/2 4/2 5/

80635. 60

80694- 84

80771. 72

80864- 84

58. 74

77. 38

92. 62

0. 53

0. 93

1. 13

1. 21

3d* 4s (a 5 P)4p z

6 S° 2/2 80882. 58

3d* 4s (6 *G)4p x

4F° 1/2 2/2 3/

4/

81200. 12

81228. 98

31268. 15

81317. 50

28. 86

39. 17

49. 35

0. 38

1. 01

1. 21

1. 32

3d* 4s (a 5F)4p x 4 G° 2/

3*2 4/

5/

81398. 09

81641 18

31721. 78

81987. 18

143. 09

180. 55

215. 45

0. 53

0. 95

1. 12

1. 20

z

2 S° /2 31786. 19 2. 30

y

2 S° /2 81962. 80 2. 21 x

4 D° z

1/2 2/

3/2

82848. 89

82456. 45

82660. 26

82891. 06

107. 56

203. 81

230. 80

0. 08

1. 17

1. 29

1. 35

3d* 4s (5 3 G)4p 2

4H° 3/

4/

5/2 6/2

82692. 09

32788. 22

82897. 81 82963. 90

96. 13

109. 59

66. 09

0. 68

0. 98

1. 11

1. 21

2

2P° /

1/2 82724- 86

82767. 88 43. 02 0. 73?

1. 22

3d* 4s (a 5F)4p w 4F° 1/2

2/2 3/2 4/2

82738. 14

82846. 74

32988. 82

83155. 30

108. 60

142. 08

166. 48

0. 52

1. 01

1. 18

1. 30 y

2 G° 4/

3/2 88306. 96

83860. 31 -53. 35 1. 03

0. 91 y

2F° 3/2

2/2 33481. 45

33527. 64

-46. 19

1. 11

0. 85

2

2H° 4/2 5/

88640. 18

33695. 82 55. 14 0. 92

1. 09

3d* 4s (c 3 P)4

p

w 4 D° z

i /2 2/2 3/2

83966. 72

88976. 02

34065. 61 84128. 04

9. 30

89. 59

62. 43

0. 09

0. 80

1. 30

1. 35

1° 34019. 12

v

4 F° 1/2 2/2

3/2 4/2

34030. 04

84167. 84

84874- 81

34529. 81

137. 80

206. 97

155. 00

0. 86

1. 32?

1. 21

1. 41

y

2 D° 1/2 2/2 84488. 76

84486. 80 58. 04 0. 73

1. 18

Config. Desig. J Level Interval Obs. g

3d* 4s (a 5F)4p v

4 D° Z

1/2 2Z

3Z

34477. 40

84587. 21 84619. 52

84747. 06

59. 81

82. 31

127. 54

0. 00

1. 05

1. 28

1. 35 u 4 D° z

iz

2/

3/2

85012. 91 85092. 36

35225. 04

35379. 11

79. 45

132. 68

154. 07

1. 12

1. 32

1. 33

3d4 (a 3 P)4p? y

4 S° 1/2 86408. 28 1. 85

x 2 D° !Z

2Z

86416. 48

36700. 78 284. 29

0. 89

1. 13 3d4 (b *F)4

p

x

2 G° 3/

4/

86461. 26

86588. 58 77. 32

0. 85

1. 05

3d* 4s (b 4 D)4p y

2 P° Z

1*2 86477. 75

36580. 46 102. 71

0. 74

1. 17 3d4 (a *P)4p? X

4 P° 2*2

1*2Z

86611. 81 36814- 80

36695. 49

-202. 99

119. 31

1. 54

1. 77

2. 51 w 2 G° 3/2 4/2 86628. 82

36828. 88 199. 51 0. 65?

3d* 4s (b 3 H)4p? w 4 G° 2/

3/2

4/2

5/2

86763. 41

86822. 86

36897. 88

86988. 42

59. 45

75. 02

40. 54

1. 06

1. 17

1. 26

x

2F° 2/2

3/2 86766. 00

36925. 88 159. 88 0. 891. 05

3d5 e

4 F IZ

2/2

3/2 4/2

36983. 63

36989. 20

37025. 60

37075. 64

5. 57

36. 40

50. 04

3d4 (a 5 D)5s e

6 D Z

IZ

2/

3/2 4Z

37116. 68

37158. 36

37227. 44

37322. 09

37440. 74

41. 68

69. 08

94. 65

118. 65

3. 08

1. 87

1. 61

1. 64

1. 48

3d4 (a *H)4V v

2 G° 3Z

4/

87174- 68

37361. 95 187. 27 0. 991. 05

y

2H° 4Z

5/

87180. 90

37210. 85 29. 95 0. 73

1. 08

3d4 (a 3 H)4p 2

4 I° 4/

5Z

6/2 7Z

87285. 08

87315. 88

87404- 25

87518. 86

30. 80

88. 42

114. 11

0. 87

0. 96

1. 08

1. 15 3d4 (b *F)4p? w 2F° 2Z

3/

37342. 66

87475. 08 132. 42 0. 84

1. 08

3d3 4s (a 5F)5s e

6F z

1/2 2/

3/

4/

5Z

37374. 98

37423. 17

37503. 14

37614. 97

37758. 07

37931. 41

48. 19

79. 97

111. 83

143. 10

173. 34

-0. 72

1. 05

1. 30

1. 33

1. 43

1. 52

3d4 (6 *F)4p w 2 D° IZ

2Z

87457. 50

87752. 54

295. 04 0. 80

1. 18

3d* 4s (b 3 H)4p? y

4H° 3Z

4/

5/

6/2

87481. 86

37516. 95

37565. 88

37626. 44

35. 59

48. 93

60. 56

0. 76

1. 05

1. 09

1. 24
294

V I—Continued

V I—Continued

Config. Desig. J Level Interval Obs. g 3d*(b 3F)4v t; 4G° 2y2 S743S. 7d x>7 9d 0. 60

3y2 37556. 00

88. 41

120. 48

1. 02 4y2 37644. 41 1. 15 5/ 37764. 89 1. 22

3d* (a 3H)4p? 2 21° 5/2 37530. 29

76. 03 0. 94

6/ 37606. 32 1. 06

3d4 (6 3F)4p t 4 D° X 37757. 24 77 74 0. 01

1/2 37834. 98 124 68 1. 18 2/ 37959. 66

155. 99 1. 33 3/ 38115. 65 1. 35 3

4 (o 5 D)5s e 4 D X 37940. 08 63 85

1/2 2 /

38003. 93

38106. 32 102. 39

136. 14 3/ 38242. 46

3d* (a 3H)4p * 2H° 4/2 38123. 76

96. 87 0. 88

5/ 88220. 63 1. 10

3d* (a 3H)4px 4H° 3X 38245. 75 78 12 0. 67

4/ 38323. 87

81. 09

78. 00

0. 93

5/ 38404• 96 1. 11

6/2 88482. 96 1. 22 u 2 G° 4/

3/

38529. 78

38610. 94

-81. 16 0. 99 0. 88? 3d3 4s (a 1H)4p? y 2I° 5% 89008. 60

72. 50 0. 92

6/2 89081. 10 1. 06

3d3 4s (a 6F)5s / 4 F I /2 39127. 23 114 11 0. 46? 2/ 39241. 34

157. 48

198. 19 1 . 03

3/ 39398. 82 1 . 22 ? 4/ 39597. 01 1. 33?

3d3 4s (a 5P)4p

w 4 P° X 89287. 10

11 80 2. 57

1/2 89248. 90

173. 76 1 . 60

2/2 39432. 66 1. 52 3

*(6 3 F)4p u 4 F° 1/2 89266. 60 33 88 0. 54

2/2 39800. 48 41 28 1 . 00

3/ 39341. 76

49. 26 1 . 21 4/ 39891. 02 1. 30

3d3 4s (c 3 P)4px 4 S° 1/2 39847. 24 2. 00

3d4 (a 3 P)4p s 4 D°

y2 89877. 62 dK 0. 01

1/2 89985. 07

64. 82

125. 90 1 . 10

2/2 39999. 89 1. 33

3/2 40125. 79 1. 38

3d4 (a 3 P)4pv 2 D° ix 39884. 48 234. 83 0. 92 2y2 40119. 26 1. 14 3d4 (a 3H)4p O s o 2/2 39962. 17 so m 0. 53

3/2 40001. 18 37 77 0. 99

4/2 40038. 95

24. 83 1. 19

5/2 40063. 78 1. 23

v 2F° 2/2 40153. 51

433. 84

3/2 40587. 35 1. 01

3d3 4s (a !P)4p? u 2 D° ix 40225. 38

100. 39 0. 70 2/ 40825. 77 1. 12 3d3 4s (a *P)4p? x 2 S° K 40299. 81

3d4 (a 3 G)4p

w 4H° 3/ 40314. 88

63. 87

72 fift

0. 65

4/ 40878. 70 0. 92

5/ 40452. 38

83. 24 1. 08

6/2 40535. 62 1. 22

Config. Desig. J Level Interval Obs. g x 2P° X

1/2 40328. 6240437. 42 108. 80 1. 52

w 2 P° X

IX 40698. 76

w 2 H° 5X

4X

40919. 68

40980. 54

-60. 86 0. 96?

0. 99

3d4 (a 3 G)4p t 4F° IX

2/2

3/2 4/2

41889. 49

41428. 93

41492. 29

41599. 36

39. 44

63. 36

107. 07

0. 42

0. 89?

1. 15

1. 23

3d3 4s (6 4 G)4p? t 2 G° 3/2 4X

41486. 58

41539. 14

102. 56 0. 90

1. 04

3d3 4s (a 1 H)4p?v 2 H° 4/2

5/2 41501. 41

41659. 71

158. 30 0. 87

1. 05

3d4 (a 3 G)4p t 4 G° 2/

3/

4/

5X

41654- 70

41758. 41

41860. 54

41918. 24

103. 71

102. 13

57. 70

0. 58

1. 03

1. 20

1. 20

v 4P° X

IX

2/

41751. 78

41848. 47

42009. 93

96. 69

161. 46

2. 56

1. 62

1. 48

3d3 4s (a 6P)4p r 4 D° X

ix

2/2 3X

41928. 47

41999. 10

42138. 00

42245. 61

70. 63

138. 90

107. 61

0. 04

1. 20

1. 33

1. 36

3d3 4s (6 J D)4p? u 2 F° 2X

zx

41950. 85

42020. 93 70. 58 0. 841. 11 3d4 (a 5 D)4d e 6 G IX

2/2

3/2 4/2

5/2

6/2

42033. 84

42070. 05

42114. 17

42177. 31

42257. 32

42353. 42

36. 21

44. 12

63. 14

80. 01

96. 10

1. 08

1. 23

1. 32

1. 35

3d3 4s (6 1 G)4p u 2H° 4/2

5/2 42079. 14

42220. 69 141. 55 0. 85

1. 06

3d4 (a 5 D)4d e «P 1/2 2/2 3X 42164. 74 1. 44?

2° 3X 42286. 66

3d* 4s (a *P)4p?v 2 P° ixX42818. 42

42480. 62 - 162. 20 1. 34

1. 14

w 2 S° X 42362. 04 1. 50?

3d4 (a 5 D)4d / «F %

IX

2X

3/2 4/2

5/2

42363. 62

42506. 32

42577. 98

142. 70

71. 66

1. 39

3d4 (a 6 D)4d «D X

ix2y2 3/2 4/2 42404. 89

42553. 62 148. 73

1. 61

w ®D°

1/2 2/2

3/2 4/2

42480. 31

42587. 41

42725. 38

107. 10

137. 92
295

Config.

3d3 4s (a 5P)4p

3d3 4s (a 5F)4d

3d3 4s (a 6F)4d

3d3 4s (6 4 G)4p

3d3 4s (a 3 F)5s

3d* (a 3 G)4p

3d3 4s (a 6F)4d

3d4 (a 3 G)4p

3d3 4s (a 5F)4d

V I—Continued V I—Continued

Desig. J Level Interval Obs. g Config. Desig. J Level Interval Obs. g

w 4 S° 1J4 42969. 49 1. 94 r

4JPO 1 X 44978. 60

75. 57

9. 45

86. 54

0. 58?

2/2 45049. 17

s

4F° 1/2 42981. 84 69 97 3/2 45058. 62 0. 97

2/ 43051. 81 95 78 4/2 45145. 16 1. 26

3/ 43147. 09

119. 06

q 4/ 43266. 15 4F° 1/2 45066. 56

40. 65

50. 51

79. 44

0. 59

2/2 45107. 21 0. 93

q

4 D° / 48249. 44 59 39 3/ 45157. 72 1. 05

I /2 48808. 88 101 99 4/ 45237. 16 1. 22

2/ 43410. 82

144. 30 3/2 43555. 12 1. 46 u 3P° X

1/2 45159. 15 1. 66? u 4P° X 48448. 33

60. 66

81. 60 3d3 4s (a 1/2 48503. 99 1 H)4p? r 2G° 3/2 45175. 92185. 50 0. 98

2/2 43585. 59 4/2 45861. 42 1. 14

e

6H 2% 43649. 40

57. 42

80. 78

106. 55

134. 18

161. 62

0. 38 2a° 5/ 45353. 69

3/2 43706. 82 0. 88

4/2 43787. 60 1. 11 3d3 4s (a 5F)4d g ®F X

5/2

6/2 7/2

43894. 15

44028. 33

44189. 95

1. 18

1. 30

1. 38

1/2 2/2 3/

45638. 54

45700. 25

45743. 62

61. 71

43. 37

69. 63

221. 33

1. 26

4/ 45813. 25

x

6F° X 43707. 97?

137. 83

113. 44

67. 05

5/ 46034. 58

1/2 48845. 80? 3d4 (a 3 D)4p p 2/4 43959. 24? 4F° I /2 45648. 86 39 55 0. 60

3/ 44026. 29? 2/ 45688. 41 71 62 4/

5/ 1 44202. 51? 176. 22 3/

4/

45760. 03

45891. 55 131. 52 1. 02

1. 32

/

6 G I /2 43818. 02

29. 14

64. 77

93. 21

134. 55

187. 35

0. 38? t 2P° I /2 45654- 50 -292. 16 1. 24?

2/ 43847. 16 0. 78 X 45946. 66

3/ 43911. 93 1. 12 4y2 44005. 14 1. 26 3d4 (a 3 D)4p 0

4D° X 45702. 14 60 10

5/2 44139. 69 1. 34 1/2 45762. 24 0. 96?

75 82

6y2 44327. 04 1. 35 2/2 45888. 06

99. 01

3/2 45937. 07 1. 45

t 2F° 3/ 43878. 79 -1. 46 1. 04?

2/ 43875 25 0. 86 r

4 G° 2/2 46052. 79 86 27 0. 56

3/2 46189. 06 104 58 0. 96

e

2 F 2/ 43918. 58

147. 47 0. 89 4/ 46243. 64 119. 78 1. 15 3/ 44066. 05 1. 18 5/2 46863. 42 1. 19

x

6P° 1/2 2/

3/ 43988. 00?

4° 1/2 2/2 2y2

J46S22. 39:

5

° 46500. 64

s

4 G° 2/ 48999. 68

43. 68

61. 19

73. 90

6° 3% 44048. 86 0. 98 1/2 46707. 18

4y2 5/

44104. 55

44178. 45

1. 26

1. 34 t

4P° X 46851. 10 11 63

1/2 46862. 73

5. 37

t

2H° 4/ 44145. 77

38. 25 0. 90 2/ 46868. 10

5/ 4418

. 02 1. 06?

3d3 4s (6 3 G)4p s

2F° 2/2 46996. 84 146. 40

1. 02 /

6P 1/2 44443. 67

88. 93

157. 87

3/2 47143. 24

2%

3/2 44532. 60

44690. 47 70 3/2 47348. 14

s 2G° 4/ 44463. 28 -32. 15

1. 09 3° 1 X 47423. 18

3% 44495. 48 0. 91 3d3 4s (6 3 G)4p s 2H° 4/2 47611. 77 89.78 1. 01?

p

4 D° X 44514 84 39. 91

62. 43

84. 20

5/2 47701. 55 0. 94

1/2 44554. 25 1. 22

2/ 44616. 68 1. 37? 8° 3/ 47615. 56

3/ 44700. 88 1. 32?

/ I /2 g

6D y2 l 2/

9°

J 47682. 68

1/2 2/

3/

4/

44844. 83

44921. 08

45056. 61

45157. 74

76. 25

135. 53

101. 13

1. 55? q

4 G° 2/

3/

4/

47690. 5

47823. 24

48014- 18

132. 7

190. 94

176. 86 5/ 48191. 04
V I—Continued

V I—Continued

Config. Desig. J Level Interval Obs. g o 4F° v/2 2/2 3/

4%

47801. 6

47915. 9

48189. 4 48828. 8

114. 3

223. 5

189. 4

10° 2/ 47809. 20

11 ° 2/2 47925. 49: 3d3 4s (6 3 G)4p q 2 G° 3H4/2 47959. 82

48157. 57 197. 75 0. 89 1. 08

12° / 2/2 l 3/ ^48001. 8:

13° 3/ 48023. 68

14° 3/ 48047. 68

15° 2/ 48070. 91

16° / 2/ l 3/ 148201. 79

17° 3/? 48289. 8 3d*(a 3 P)4p? v 2S° ^2 48844. 67 2. 03

18° 2/ 48881. 48

19° 2/ 48964. 99

20° 1/2 49000. 82 n 4 D° y2 1H

2/2 3/

49189. 74

49288. 77

49440. 81 49584. 09

94. 03

156. 54

143. 78

21 ° 2/ 49802. 61

22° / 3/ t 4/ } 49341. 90:

3d3 4s (6 »D)4s t 2 D° 2/

1H

49689. 01

49722. 88 -33. 87 1. 25

3d3 4s (a 6F)5d / 6H 2/

3/2 4/

5/2 6/2

7/2

49717. 57

49797. 18

49875. 12

49983. 16

50164. 26

50301. 63

79. 61

77. 94

108. 04

181. 10

137. 37

3d3 4s (a 6F)5d g ®G VA2/

3/

4/

5/

6/2

49789. 17

49932. 37

50114. 59

50209. 05

143. 20

182. 22

94. 46

3d3 4s (6 3H)4p

x 2I° 5/

6/2 49977. 90

50120. 69 142. 79 0. 91 1. 06

23° 3J4? 50090. 28

Config. Desig. J Level Interval Obs. g

24° 2/ 50180. 6

25° 3/? 50154- 85

26° J 2/2 l 3/ } 50833. 59

27° ix 50855. 89 r 2 F° 2/2

3/2 50404. 14

50539. 27 135. 13

28° f 2/2 1 3/2 ^50488. 35 p 4 G° 2/2

3/2 4/2 5/2

50452. 6: 50579. 6 50742. 4

50938. 58:

127. 0

162. 8

191. 2

29° 3/ 50529. 67

3d3 4p2 h 6 G 154 2/3/2 4/

5/

6/2

50584. 27

50654. 72

50751. 83

50876. 00

51026. 30

51201. 12

70. 45

97. 11

124. 17

150. 30

174. 82

30° 3/2 50595. 73 n 4F° I/2 2/3/2 4/

50909. 7 51021. 2

51174. 50

51866. 6

111. 5

153. 3

192. 1 m 4D° X1 X

2/2 3/

50976. 5: 51067. 7 51212. 2: 51398. 1:

91. 2

144. 5

185. 9

31° / 1J< l 2/ 51194. 2

32° ix 51880. 69

33° (1 

/ }

62008. 09

3d3 4s (6 3H)4p?

V 2 G° 3/4/

52774. 08

52947. 98 173. 90

3d3 4s (6 3H)4p? r 2H° 4/2

5/2 54081. 51

54251. 26 169. 75

V 11 (a 6 D0) Limit 54361

34° 2/ 55202. 44

35° / 1/2 1 

/

}55877. 82: s 2P° IXX

67661. 86?

57744 12?

-182. 76
V i Observed Terms*

297

*For predicted terms in the spectra of the Vi isoelectronic sequence, see Introduction.
298

Vn

(Til sequence; 22 electrons) Z=23

Ground state Is2 2s2 2_p

6 3s2 3 3d4 6D0

a

5D0 114600 cm-1

I. P. 14.2 volts

The analysis is from the paper by Meggers and the writer, who published 89 terms and

1456 classified lines in the region from 1313Ato 7015 A. The terms of the three multiplicities are connected by observed intersystem combinations.

The ^-values were calculated from unpublished data kindly furnished by Babcock and

given in the 1940 reference below.

This is the first spectrum in which all theoretical terms (except the highest singlet, 1 S),

arising from the electron configuration d

4 have bet a established.

Many has discussed the configuration assignments and suggests from theoretical calculations that the term c

X D at 44658 cm-1 be assigned to 3d? 4s. The two other terms which

he criticizes, b

3 P and c3 P, were published in 1940 with precisely the limits he suggests.

Although intensively sought, series have not been found, probably because this spectrum

has been observed only with condensed sparks at atmospheric pressure. The limit, entered

in brackets in the table, was estimated by Russell from isoelectronic sequence data.

When the analysis of Vm has been extended, the prefixes b, c, assigned by the writer to the limits may be changed. The limits here called a

2F, b2 G, and c2D have not yet been

observed in Vhi.

REFERENCES

H. N. Russell, Astroph. J. 66, 233 (1927); Mt. Wilson Contr. No. 342 (1927). (I P)

W. F. Meggers and C. E. Moore, J. Research Nat. Bur. Std. 25, 83 RP1317 (1940). (I P) (T) (C L) (E D)

(Z E)

A. Many, Phys. Rev. 70» 511 (1946).

Vll Vil

Config. Desig. J Level Interval Obs. g Config. Desig. J Level Interval Obs. g

3d4 a

5 D 0 0. 00

36. 05

70. 58

102. 26

130. 32

3d4 a

3 H 4 12545. 15

76. 42

84. 58

51. 84

66. 32

0. 83:

1 36. 05 5 12621. 57 1. 02

2

34

106. 63

208. 89

339. 21 3d4 b

3 F

62

12706. 15

13490. 84

1. 27:

0. 59

3 13542. 68 1. 06

3

3 (o 4 F) 4s a5 F 1 2604. 82

82. 19

121. 75

159. 46

194. 58

4 13609. 00 1. 19

2 2687. 01 0. 97

3 2808. 76 1. 20 3d3 (a 4 P) 4s a

5 P 1 13511. 71

83. 02

146. 88

2. 39

4 2968. 22 1. 30: 2 13594. 73 1. 78

5 3162. 80 1. 28: 3 13741. 61 1. 62

3d3 (a 4 F)4s a 3 F 2 8640. 21

201. 76

255. 84

0. 65 3d4 a

3 G 3 14461. 73

94. 36

99. 54

0. 74

3 8841. 97 1. 04 4 14556. 09 1. 00

4 9097. 81 1. 22 5 14655. 63 1. 17 3d4 a

3 P 0 11295. 51

219. 25

393. 51

3d3 (a 2 G) 4s b

3 G 3 16340. 97

80. 54

111. 49

0. 76

1 11514. 76 1. 48 4 16421. 51 1. 03

2 11908. 27 1. 49 5 16533. 00 1. 16
299

V II—Continued V n—Continued

Config. Desig. J Level Interval Obs. g Config. Desig. J Level Interval Obs. g

3d4 a *G 4 17910. 98 0. 95 3

d

3 (a 4 F)4p 2

3 D° 1 36954- 58

86. 53

163. 90

0. 24

2 37041. 11 1. 08

3d4 a

3 D 1 18269. 49

24. 38

60. 02

0. 49 3 37205. 01 1. 32

2 18293. 87 1. 13

3 18353. 89 1. 30 3

d

3 (a 4 F)4p 2

5 D° 0 87201. 41

58. 01

109. 59

151. 60

10. 48

1 87259. 48 1. 39

3d3 (a 2 G)4s b

4 G 4 19112. 93 0. 98 2 37369. 01 1. 39

3 87520. 61 1. 47

3d3 (a 2 P) 4s b

3 P 2 19132. 69 -33. 50

4. 92

1. 38 4 87581. 09 1. 44

1 19166. 19 1. 40

0 19161. 27 3d3 (a 4 F)4p 2

3 G° 3 39234- 05

169. 72

209. 20

0. 84

4 39403. 77 1. 03

3d4 a n 6 19191. 50 0. 96: 5 89612. 97 1. 19 3d4 a iS 0 19902. 60 3

d

3 (a 4 F)4p 2

3 F° 2 40001. 66

193. 86

234. 58

0. 65

3 40195. 52 1. 02

3d3 (a 4 P)4s c

3 P 0 20156. 64 67 08 4 40480. 10 1. 22

1 20089. 56

253. 44 1. 35

2 20343. 00 1. 36 3d3 (c 2 D)4s c

3 D 3 44098. 46 -60. 97

-41. 54

1. 27:

2 44159. 43 1. 14: 3d3 (a 2H)4s b

3H 4 20242. 32 37 87 0. 82 1 44200. 97:? 0. 50: 5 20280. 19

83. 03 1. 01

6 20363. 22 1. 14 3d4 c

J D 2 44657. 99

3d3 (a 2 D)4s b

3 D 1 20522. 14 94 91

0. 58 3d3 (a 4 P)4p 2

3 P° 0 46586. 48 104. 00

49. 55

2 20617. 05

5. 94

1. 25 1 46690. 43 1. 44

3 20622. 99 1. 26 2 46739. 98 1. 48

3d4 a

4 D 2 20980. 92 1. 02 3d3 (a 4 P)4p 25 P° 1 46754- 59

125. 35

171. 95

2. 28

2 46879. 94 1. 65

3d3 (a 2 P)4s a J P 1 22273. 54 0. 97 3 47051. 89 1. 58

3d3 (a 2 H)4s a iH 5 23391. 09 1. 04 3d3 (a 4 P)4p y

5 D° 0 47027. 88

80. 10 -6. 10

79. 29

238. 93

1 47107. 98 1. 43

3d3 (a 2 D)4s b

4 D 2 25191. 08 0. 99 2 47101. 88 1. 47

3 47181. 17 1. 48: 3d4 a

4 F 3 26839. 82 0. 97 4 47420. 10 2. 28

3d4 c

3 F 2 30267. 46

38. 94

12. 23

0. 67 3d3 (a 2 G)4p 2

3H° 4 47056. 82

240. 76

310. 71

0. 78

3 30306. 40 1. 06 5 47297. 08 1. 01 4 30318. 63 1. 25 6 47607. 79 1. 13 3d3 (a 2 F)4s d 3 F 4 30613. 97 -27. 74 -31. 43

1. 23 3d3 (a 2 P)4p 2

1 S° 0 48258. 28

3 30641. 71 1. 05

2 30673. 14 0. 67 3d3 (a 2 G)4p y

3 G° 3 48579. 96

150. 80

122. 28

0. 67

3d4 32040. 76

4 48730. 76 1. 02

d 3 P 2 -258. 48 - 120. 801. 38 5 48858. 04 1. 22

1 32299. 24 1. 48

0 32420. 04 3d3 (a 2 G)4p y

3 F° 2 49201. 66

9. 12

57. 83

0. 63

3 49210. 78 0. 99

3d3 (a 2 F)4s b

4 F 3 34228. 79 1. 00 4 49268. 61 1. 18 3d3 (a 4 F)4p z

5 G° 2 84592. 72

153. 00

200. 83

246. 58

290. 26

0. 31 3d3 (a 2 G)4p 2

4 F° 3 49568. 45 0. 97

3 34745. 72 0. 93

4 84946. 55 1. 14 3d3 (a 2 G)4p 2 >H° 5 49593. 41 0. 95

5 85193. 18 1. 16

6 85483. 89 3d3 (a 2 G)4p 2 >G° 4 49723. 68 0. 96

3d4 c iG 4 36425. 07 0. 96 3d3 (a 4 P)4p 2

3 S° 2 49781. 32

3d3 (a 4 F)4p z 6F° 1 86489. 34 184. 17

245. 72

231. 34

201. 82

0. 35 3d3 (a 2 P)4p 2 >D° 2 49898. 22 0. 93

2 86678. 51 1. 08

3 86919. 28 1. 24 3d3 (a 4 P)4p y

3 D° 1 50473. 76 301 71

0. 49

4

5 87150. 5737352. 89 1. 40:

2

3 50775. 4751085. 77

310. 30

1. 11

1. 27

3d3 (a 2 P)4p y

3 P° 0 50662. 86 76 46

1 50788. 82 1. 39

384. 49

2 51123. 31 1. 51
300

V II—Continued V II

Continued

Config. Desig. J Level Interval Obs. g

3

3 (a 2 H)4p y

3H° 4

5

6

52082. 88

52158. 55

52252. 70

70. 67

99. 15

0. 70

0. 98

1. 04: 3d3 (a 2 P)4p z

3 S° 1 52181. 18 1. 85

3

3 (a 2 D)4p x 3 F° 2

34

52245. 68

52891. 94

52657. 51

146. 26

265. 57

0. 68

1. 07

1. 18: 3d3 (a 2 P)4p x 3 D° 12

3

52604 11 52700. 08

52767. 86

95. 92

67. 33

0. 63

1. 10

1. 26

3d3 (a 2 P)4p z

4 P° 1 52808. 75 0. 92

3d3 (a 2H)4p z

3 I° 5

67

52877. 99

58076. 82

58819. 52

198. 83

242. 70

0. 84:

0. 98

1. 11:

3

3 (a 2 D)4p w 3 D° 12

3

53751. 46

58868. 68

58927. 19

117. 17

58. 56

0. 49:

1. 10

1. 37

3

3 (a 2H)4p y

1 G° 4 54144 20 1. 00

3d3 (a 2 D)4p X

3 P° 2

10

54715. 63

54717. 85

54818. 45

-2. 22

-95. 60

3

3 (a 2 D)4p y

1 F° 3 55142. 01 0. 94

3d3 (a 2H)4p X

3 G° 54

3

55206. 87

55304- 34

55349. 68

-97. 47

-45. 29

1. 15

1. 02

0. 82

3

3 (a 2 H)4p z il° 6 55403. 38 1. 01: 3d3 (a 2 H)4p y 'H° 5 55499. 38 1. 03:

3

3 (a 4 P)4p y3 S° 1 55663. 27 1. 92

3d3 (a 2 D)4p y

1 P° 1 56171. 49 1. 05: 3d3 (a 2 D)4p y

! D° 2 57342. 59 0. 98

3d3 (a 2 F)4p w 3 F° 2

34

62085. 02

62188. 39

62176. 24

48. 37

42. 85

0. 58:

1. 00

1. 36:

1° 4 62761. 9

3d2 4s(b 4 F)4p y

5 F° 12

34

5

68548. 5: 63657. 2

63816. 9

64026. 6

64287. 1

108. 7

159. 7

209. 7

260. 5

3d3 (a 2 F)4p w 3 G° 34

5

64057. 89

64130. 84

64229. 10

73. 45

98. 26

0. 72:

1. 02

3

2 (a 2 F)4p x >D° 2 64586. 23 1. 03: 3d3 (a 2 F)4p v

3 D° 3

2

1

64603. 53

64804 13

64930. 76

-200. 60

-126. 63

1. 22:

1. 02:

0. 46: 3d2 4s (5 4 F)4p x 5 D° 0

12

34

65783. 4

65816. 2

65885. 3

65996. 7

66158. 6

32. 8

69. 1 111. 4

161. 9

Config. Desig. J Level Interval Obs. g

3d3 (a 2 F)4p x *G° 4 65790. 28 0. 94

3d2 4s (6 2 F)4p y

5 G° 2

34

5

6

66228. 4: 66667. 8: 66962. 7: 67356. 0: 67795. 7:?

438. 9

295. 4

393. 3

439. 7

3d3 (a 2 F)4p x 4 F° 3 66808. 88 0. 95

3d2 4s(6 4 F)4p v

3 F° 234

67787. 8

67905. 1 681 47. 2

167. 3

242. 1

3d2 4s(6 4 F)4p u 3 D° 12

3

68759. 4

68797. 7 68945. 0

38. 3

147. 3

3d2 4s (6 4 F)4p v

3 G° 34

5

69644. 2

69912. 1 70227. 8

267. 9

315. 7

3d2 4s (6 2 G)4p x 1 H° 5 70936. 4 3d2 4s (b 2 G)4p W !G° 4 72292. 2: 3d3 (a 4 F)4d e

5H 34

5

6

7

72447. 96

72550. 71 72680. 20:

72837. 00:

73020. 35:

102. 75

129. 49

156. 80

183. 35

3d3 (a 4 F)4d e

5 P 12

3

72517. 84:

72674. 28

72908. 17

156. 44

233. 89

3d3 (a 4 F)4d e

5 D 0

12

34

72682. 06:?

72789. 23:?

72951. 00:

107. 17

161. 77

3d3 (a 4 F)4d e

B G 2

34

5

6

73026. 76

73145. 68

73278. 92

73416. 63

73498. 93:

118. 92

133. 24

137. 71

82. 30

3d3 (a 4 F)4d e

5 F 12

34

5 73222. 72: 73293. 82:? 71. 10

3d2 4s(6 2 G)4p w ‘F 0 3 74664. 5

3d3 (c 2 D)4p? t

3 D° 12

3

75715. 45:1

75758. 29

75848. 13

42. 84

89. 84

0. 50:

1. 14:

1. 27: u 3 F° 2

34

76220. 4

76885. 8

76648. 5

165. 4

257. 7

2° 3 76405. 4 w 4 D° 2 78791. 3: 3° 3 79040. 4

V hi (0 4 F1H) Limit — [114600]

June 1948.
301

V it Observed Terms*

Config.

Is2 2s2 2

p

6 3s2 3p 6 +

Observed Terms

3d4

( a

5 D

a

3 P a

3 D b3 F a3 G a3 H

d

3 P c

3 F

a

4 S aJ D a

X F a *G a

X I

( c

4 D c

1 G

ns (n>4) np (n> 4)

3d3 (a 4 F)nx / a

5 F

t a

3 F

2

5 D°

2

3 D°

2

5 F°

2

3 F°

2

5 G°

2

3 G°

3d3 (a 2 P)nx /

6

3 P

\ a

1 P

2

3 S°

2

4 S° ti OO o OPo H

N

3d3 (a 4 P)nx / a

5 P

1 c

3 P

o

o

COCO N

Si 2

5 P°

2

3 P°

y

5 D°

y

3 D°

3d3 (a 2 G)nx /

b

3 G

\ 6

1 G ti OO y

3 G°

2

1 G°

zz m°

1 H°

3d3 (a 2 D)nx /

b

3 D

\ b iD 66o

o w 3 D°

y

1 D°

x

3 F°

y

1 F°

3d3 (a 2 H)nx /

b

3 H

X a

i H

H 660

o y

y 66 o

o

ti

ti

HH

OH o

o

3d3 (a 2 F)nx f d 3 F

\ b iF

v

3 D°

x JD 0 w*F°

x

4 F° w 3 G°

X >G°

3d2 4s (b 4 F)nx x

5 D°

u

3 D°

y

5 F°

v

3 F°

y

5 G°

v

3 G°

3d2 4s (b 2 G)nx w J F° n^G0 X iff 0

3

d

3 (c 2 D)nx c

3 D 1 3 D°

nd (n>4)

3d3 (a 4 F)nx e

6 P e5 D e5 F e5 G e5 H

*A chart of predicted terms in the spectra of the Ti i isoelectronic sequence is given in the Introduction. Owing to the differences in binding energy of the 3d and 4s electrons the arrangement of the charts of predicted and observed terms is different for V 11.

Vlll

(Sc i sequence; 21 electrons) Z=23

Ground state Is2 2s2 2p

& 3s2 3

p

6 3d3 4Fm

a

4F1H 240000 cm"1 I.P. 29.7 volts

The analysis is by White, who has classified 120 lines in the interval between 1117 A and

2595 A. The limit (entered in brackets in the table) is derived from his extrapolation of

isoelectronic sequence data.

The doublet and quartet terms are connected by observed intersystem combinations.

The reality of the term a

2P is questioned in the paper by Many.

REFERENCES

H. E. White, Phys. Rev. 33, 672 (1929). (IP) (T) (C L)

A. Many, Phys. Rev. 70, 513 (1946).
302

Vra V in

Config. Desig. J Level Interval Config. Desig. J Level Interval

3d3 a

4F VA 0

145 3d2 (a 3F)4p z

4F° VA 86716 221

281

326

2^ 145 194 2y2 86937

3/2 339 244 3/4 87218

4/2 583 4>4 87544

3d3 a 2P 11207 180 3d2 (a 3F)4p 2

2F° 2y2 87881 448

1J4 11387 3/2 88329

3d3 a

4 P

1/2 11513 77

181

3d2 (a 3 F)4p 2

2 D° 1/2 88560 386 11590 2/2 88946

2J4 11771

3d2 (a 3 F)4p 2

4 D° /4 89004 187

267

-40

3d3 a

2 G 3/2 4^2 11966

12187 221 W2/2 3H

89191

89458

89418

3d3 a

2 D 1H 16229 147 2^ 16376 3d2 (a 3 F)4p 2

2 G° 3/2 4y2 91712

92055 343

3d3 a

2H 4^2 16822 155 5^ 16977 3d2 (a 3F)4d e

4H 3y2 141269 217

247

258 3d2 (a 3F)4s 6

4 F 1H 43941 167

236

301

4/2 5y2 141486

141733

2K

3K

4}4

2/2

44108

44344

44645

6y2 141991

3d2 (a 3F)4s b

2F 49329 478 V iv (a 3 F2) Limit [240000]

3/2 49807

3d2 (a 3F)4p z

4G° 2^ 85523 351 3^ 85874 431

4^2 86305 503

5H 86808

June 1948. V hi Observed Terms*

Config.

Is2 2s2 2p6 3s2 3p®+ Observed Terms

3d3

3d2 (a 3 F)wa;

1

fa 4 P a 4 F

\a 2 P a 3 D a 2 G a 2H

ns (n> 4) np (n> 4) wd (n>4)

/

b

4 F

\ b

2 F

2

4 D° 2

4 F° 2

4 G°

2

2 D° 2

0 2F° 2

2 G°

e

4H

*For predicted terms in the spectra of the Sc i isoelectronic sequence, see Introduction.
(Ca i sequence; 20 electrons)

Ground state Is2 2s2 2_p

6 3s2 3p6 3d2 3F2

Z=23

303

V iv

a

3F2 391000 cm"1 I. p. 48 volts

White has classified 64 lines in the region between 675 A and 2269 A, and extrapolated

the limit from isoelectronic sequence data. The limit derived from his ionization potential

is entered in brackets in the table.

From a study of related spectra, Edlen has rejected White’s 3d % term, and his four

intersystem combinations. Edlen suggests that the line observed at 734.36 A (136173 cm-1

) may be designated a a Tib—

3 F2 , which decreases White’s singlet terms by 698 cm-1

. This

change has been adopted here.

REFERENCE

H. E. White, Phys. Rev. 33, 538 (1929). (I P) (T) (C L) B. Edl6n- unpublished material (Feb. 1949). (T) (C L)

V iv V IV

Config. Desig. J Level Interval Config. Desig. J Level Interval

3d2 a »F 2 0 318

412 3 318 3d(2 D)4p 2

3 F° 2 147183 520

4 730 3 147653 712

4 148365

3d2 a *D 2 10960

3d(2 D)4p z

2 P° 0 151446 22

3d2 a *P 0 13121 117 1 151424 140

1 13238 215 2 151564

2 13453

3d(2 D)4p 2 iF° 3 153920

3d2 a iG 4 18389

3d(2 D)4p 2 IP 0 1 155567

3d(2 D)4s a *D 1 96195 215

385

e *G 217835

218097

2

3 9641096795

3d(2 D)4d 34 262

364

5 218461

3d(*D)4s b *D 2 100204 3d(2 D)4d e »F 2 223510 323

3 223833 430 3d(J D)4p z iD° 0 144276 4 224263

3d(*D)4p z *D° 1 146116 310

2

3 146426

146851 425 V v (

2 DlH) Limit --- [391000]

Feb. 1949. V rv Observed Terms*

Config.

Is2 2s2 2p6 3s2 3p8 +

Observed Terms

3d2 / o

3P a

3 F

\ a

1 D a

1 G

ns (n>4) np (n> 4) nd (n>4)

3d(2 D)rw: / a

3 D 2 ipo 2 *D° 2

3 F° e

3F e *G

\ b *D 2 ipo 2

i Do 2

l F

o

*A chart of predicted terms in the spectra of the Ca i isoelectronic sequence is given in the Intro- duction. Owing to the change in binding energies of the 3d and 4s electrons along this sequence, the arrangement of the charts of observed and predicted terms is not identical. In V iv the

prefixes a, 6, . . . e, z replace those indicating the running electron.
(Ki sequence; 19 electrons) Z=23

Ground state Is2 2s2 2p

6 3s2 3p* 3d 2T)iya

3d 2Diy2 526000 cm-1

I. P. 65.2 volts

The terms have been calculated from the data published by Gibbs and White, who classified 11 lines in the region between 286 A and 1716 A. From these data Kruger and Weissberg have calculated the limit by fitting a Ritz-Rydberg formula to the 2S terms. Their

limit in round numbers is quoted here.

REFERENCES

R. C. Gibbs and H. E. White, Phys. Rev. 33, 162 (1929). (C L)

P. G. Kruger and S. G. Weissberg, Phys. Rev. 52, 317 (1937). (I P)

V V

Config. Desig. J Level Interval

3p6

(

1 S)3d 3d 2 D i x 0 620

2/ 620

3p6

(

1 S)4s 4s 2 S x 148100

3p«0S)4p 4p 2 P° x 20684.7 1270

i x 207617

SpHWs 5s 2 S X 328167

3p6

(

1 S)4/ 4/ 2 F° / 2/2 l 3/2 } 849204

3p«0S)6s 6s 2 S X 4C3933

V vi OSo) Limit --- 526000

May 1948. V vi

(A i sequence; 18 electrons) Z=23

Ground state Is2 2s2 2p

6 3s2 3p6

3^>

6 rS0 1040100 cm-1

I. P. 128.9 volts

Four lines are classified in the region between 128 A and 182 A, as combinations with the

ground term. The values fisted in the table have been rounded off in the last places.

For convenience, the Paschen notation has been added by the writer in column one under

the heading “Ai”. As for Ai, the ^coupling notation in the general form suggested by

Racah is here introduced, although Z$-designations, as indicated in column two under the

heading “Authors”, are perhaps preferable for the terms thus far identified.

REFERENCES

P. G. Kruger and S. G. Weissberg, Phys. Rev. 48, 659 (1935). (I P) (T) (C L)

P. G. Kruger, S. G. Weissberg and L. W. Phillips, Phys. Rev. 51, 1090 (1937). (I P) (T) G. Racah, Phys. Rev. 61, 537 (L) (1942).
V vi

A i Authors Config. Desig. J Level

lpo 3p

6 J S 3p« 3p

6 iS 0 0

IS4 3p

5 4s 3 po

3p5 (2P1°H)4s 4s [i y2]° 2

1 549800

1$2 3p

5 4s ipo 3p5 (

2 P£)4s 4s' [ y2 ]° 0

1 557650

2s4 3p

5 5s 3p° 3p5

(

2 Pih)5s 5s [i y2 ]° 2

1 771760

2s2 3p

5 5s ipo 3p5

( 2 P£)5s 5s'[ y2]° 0

1 778920

V vn (*P!h) Limit 1040100

V vn (*P£) Limit --- 1047760

May 1948.

V vii

(Cl i sequence; 17 electrons) Z—23

Ground state Is2 2s2 2p

6 3s

2 3p

5 2Pj^

3p

5 2Pii/2 1216000 cm-1

I. P. 151 volts

All of the terms except 3p

6 2S are from the paper by Edlen. Thirteen lines in the region

between 148 A and 472 A have been classified as combinations from the ground state. Edlen

has estimated the value of the limit by extrapolation along the isoelectronic sequence, as indicated by brackets in the table. His unit, 103 cm-1

, has here been changed to cm-1

. REFERENCES

S. G. Weissberg and P. G. Kruger, Phys. Rev. 49, 872 (A) (1936). (C L) B. Edl6n, Zeit. Phys. 104, 407 (1937). (I P) (T) (C L)

V VII

Config. Desig. J Level Interval

3s2 3p

5 3p5 2 P° 1/2

/2 0

7660 -7660

3s 3p

6 3

p

6 2 S H 219160

3

2 3p4

(

3 P)4s 4s 4 P 2/

1/2 608640

612810

615480

-4170

-2670

3s2 3p4 (

3 P)4s 4s 2P 1/2H

620650

625570 -4920

3s2 3p4 0D)4s 4s' 2 D 2/2 1 X

638540

638710 -170

3s2 3p4 (

1 S)4s 4s" 2S X 671580

V viii (

3 P2) Limit — [ 1216000\

January 1948.
306

V vm

(S i sequence; 16 electrons) Z=23

Ground state Is2 2s2 2p6 3s2 3p* 3 P2

3p

4 3 P2 1401000 cm"1 I. P. 173.7 volts

The analysis is by Edlen, who has classified 19 lines in the range between 135 A and

147 A. He has extrapolated the limit from isoelectronic sequence data. The singlet and

triplet terms are connected by two observed intersystem combinations.

Edlen’s unit, 103 cm-1

, has here been changed to cm-1

. REFERENCE

B. Edl6n, Zeit. Phys. 104, 188 (1937). (I P) (T) (C L)

V vm V viii

Config. Desig. J Level Interval

3s2 3

p

4 3

p

4 3 P 2

10

0 6000

7580

-6000

-1580

3s2 3

p

4 3

p

4 J D 2 27120

3s2 3

p

4 3p4 »S 0 60720

3s2 3p3

(

4 S°)4s 4s 3 S° 1 687250

3s2 3p3 (

2 D°)4s 4s' 3 D° 1 710600 310

2

3 710910711990 1080

Config. Desig. J Level Interval

3s 2 3p3

( 2 D°)4s 4s' iD 0 2 718450

3s2 3p3

(

2 P°)4s 4s" 3 P° 0 734240 630

1770

12 734870

736640

3s2 3p3

(

2 P°)4s 4s" iP° 1 742790

V ix (

4 S^) Limit --- 1401000

January 1948.

V ix

(P i sequence; 15 electrons) Z=23

Ground state Is2 2s2 2

p

6 3s2 3p

3 4S°^

3p

3 4 Sj^ cm-1

I. P. volts

Kruger and Pattin have observed 6 lines near 126 A, and arranged them in two multiplets

that give intervals consistent with those found in related isoelectronic spectra.

By a rough extrapolation of 3p3 4S°^— 3p

3 2D°^ along the isoelectronic sequence, the

writer has estimated the value of 3p

3 2D°^ (entered in brackets in the table), and calculated

the terms listed below from the multiplets given by Kruger and Pattin. The uncertainty x

in the estimated position of the doublet terms relative to the quartets may exceed ± 500 cm-1

. REFERENCE

P. G. Kruger and H. S. Pattin, Phys. Rev. 52, 624 (1937). (C L)
V IX

Config. Desig. J Level Interval

3s2 3p

3 3p

3 4 S° 1 X 0

3s2 3p

3 3p

3 2 D° 1}4 2y2 [86000]+

87520 +x 1520

3s2 3p2

(

3 P)4s 4s 4P /? 1 X

2%

789070

792700

797320

3630

4620

3s2 3p2

(

1 D)4s 4s' 2 D 2/2

1/2 824500 +x

824860 +x -360

December 1947. V xi

(A1 i sequence; 13 electrons) Z—23

Ground state Is2 2s2 2p6 3s2 3p

2P^

3V

2P% cm"1 I. p. volts

This spectrum has not been analyzed, but Edlen has classified two lines as follows:

I. A. Int. Wave No. Desig.

87. 166

87. 868

3

4 11472401138070 }3p 2P° —4d 2 D

His unit, 103 cm-1

, is here changed to cm-1

. REFERENCE

B. Edl6n, Zeit. Phys. 103, 540 (1936). (C L)

December 1947.

V xn

(Mg i sequence; 12 electrons) Z=23

Ground state Is2 2s2 2p

6 3s2 JS0

3s2 X S0 2490000 cm-1

I. P. 309 volts

Edlen has classified 15 lines in the region between 61 A and 106 A. No intersystem combinations have been observed, and the triplet terms are not all connected by observed combinations. He has determined the relative positions of the various groups of terms and also

the ionization potential by extrapolation along the isoelectronic sequence. His estimated

value of the limit is entered in brackets in the table.

His unit, 103 cm-1

, has here been changed to cm-1

. REFERENCE

B. Edl<§n, Zeit. Phys. 103, 536 (1936). (I P) (T) (C L)
308

V xii V xn

Config. Desig. J Level Interval Config. Desig. J Level Interval

3s2 3s2 iS 0 0 3s(2 S)4/ 4/ 3F° 2

Q

3s(2 S)3p 3p

3P° 0 188850+x 3100 4 1485160+x

1 191450+x 7160 2 198610+x 3s(2 S) 5d 5d *D 12 1818660+x 250

3s(2 S)3d 3d 3 D 1o

3 1818910+x

3 549580 +x 3s( 2S)5/ 5/ 3 F° 2

q

3s(2 S)4s 4s 3 S 1 1212500+x 4 1848960+x

3s(2 S)4p

3s(2 S)4d

4p !P° 4d 3 D

1 1310500

1 1424530+x 320

560

V xiii (

2 S^) Limit [2490000]

2 1424850 +x

3 1425410+x

August 1947. y xiii

(Na i sequence; 11 electrons) Z=23

Ground state Is2 2s2 2p6 3s 2S^

3s 2SVa 2713130 cm"1 I. P. 336.29 volts

Edlen has classified 15 lines in the interval 52 A to 99 A, and extrapolated the absolute

value of the ground term from isoelectronic sequence data.

The unit adopted by Edlen, 103 cm-1

, has here been changed to cm-1

. REFERENCE

B. Edl6n, Zeit. Phys. 100, 621 (1936). (I P) (T) (C L)

V XIII V XIII

Config. Desig. J Level Interval Config. Desig. J Level Interval

3s 3s 2 S 0 4/ 4/ 2 F° 2H

3/2 1550290

1550510 220

3V 3p

2 P° % 225850 11080 iy2 286430 5p 5p

2 P° y

iy2 1889360

1891430 2070

3d 3d 2 D 1/2 545500 1230

2y2 546730 5d 5d 2 D 1/2 2/2 1946050

1946360 310

4s 4s 2 S y2 1300330

5/ 5/ 2 F° 2/2 4p 4p

2 P° y2 1388410 4370 3h 1968740

1/2 1392780

4d 4d

2 D iy2 1505740 600

2/2 1506340 V xiv OSo) Limit — 2713130

June 1947.
309

V xiv

(Ne i sequence; 10 electrons) Z=23

Ground state Is2 2s2 2p6

2pa % 7237600 cm-1

I. P. 897.1 volts

Edlen and Tyr6n have classified four lines in the region between 20 A and 23 A, as combinations with the ground term. They have derived absolute term values by extrapolation

along the Nei isoelectronic sequence. Their unit, 103 cm-1

, has here been changed to cm-1

. As for Nei, the jZ-coupling notation in the general form suggested by Racah is introduced.

REFERENCES

B. Edl6n and F. Tyr<5n, Zeit. Phys. 101, 210 (1936). (I P) (T) (C L). G. Racah, Phys. Rev. 61, 537 (L) (1942).

V XIV

Authors Config. Desig. J Level

2p !S0 2p8 2

! S 0 0

2p5 (

2 Pi^)3s 3s [1 y2]° 2

3s 3 P, 1 J,202700

2p5

(

2 PA)3s 3s' [ y2 ]° 0

3s ip, 1 4257100

3d »Pj 2p5

(

2 Pf^)3d 3d [i y2 ]° 1 4757800

3d 3 D, 2p5

(

2 Pfo)3d 3d'[iy2]° 1 4827200

V xv (

2 PfM) Limit 7237600

V xv ( 2 P£) Limit --- 7295300

April 1947.

FORM NBS-114A (i-7i) U.S. DEPT. OF COMM.

BIBLIOGRAPHIC DATA

SHEET

1. PUBLICATION OR REPORT NO.

NBS-NSRDS 35, Vol. I

2. Gov’t Accession

No.

3. Recipient’s Accession No.

4. TITLE AND SUBTITLE

Atomic Energy Levels as Derived from the Analyses of Optical

Spectra. Vol. I, H to V

5. Publication Date December

6. Performing Organization Code

7. AUTHOR(S)

Charlotte E. Moore

S.

10. Project/Task/Work Unit No. 9. PERFORMING ORGANIZATION NAME AND ADDRESS

NATIONAL BUREAU OF STANDARDS

DEPARTMENT OF COMMERCE

WASHINGTON, D.C. 20234

11. Contract/Grant No.

12. Sponsoring Organization Name and Address

Same

13. Type of Report & Period

Covered

Final

14. Sponsoring Agency Code

15.

SUPPLEMENTARY NOTES

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.)

This series of three volumes is a critical compilation of atomic energy levels

prepared at the National Bureau of Standards from the analyses of optical spectra.

Volume I contains data on the spectra of hydrogen, deuterium, tritium, helium,

lithium, beryllium, boron, carbon, nitrogen, oxygen, fluorine, neon, sodium,

magnesium, aluminum, silicon, phosphorus, sulfur, chlorine, argon, potassium,

1 23

calcium, scandium, titanium, and vanadium ( H to V) . Volume II covers the

spectra of chromium, manganese, iron, cobalt, nickel, copper, zinc, gallium,

germanium, arsenic, selenium, bromine, krypton, rubidium, strontium, yttrium,

24 41 zirconium, and niobium ( Cr to Nb) . Volume III includes the spectra of

molybdenum, technetium, ruthenium, rhodium, palladium, silver, cadmium, indium,

tin, antimony, tellurium, iodine, xenon, cesium, barium, lanthanum; hafnium,

tantalum, tungsten, rhenium, osmium, iridium, platinum, gold, mercury, thall^^m,

lead, bismuth, polonium, radon, radium, and actinium (^Mo to 5 La; ^Hf to Ac).

17.

KEY WORDS (Alphabetical order, separated by semicolons)

Energy levels; H-V.

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given in your order, e.g. NSRDS—NBS—21, Kinetic Data on Gas Phase Unimolecular Reactions, by S. W. Benson and

H. E. O’Neal. Pay for publications by check, money order, or Superin- tendent of Documents coupons or deposit account. Make

checks and money orders payable to Superintendent of Documents. Foreign remittances should be made either NSRDS-NBS 1, National Standard Reference Data SystemPlan of Operation, by E, L. Brady and M. B. Wallenstein, 1964 (15 cents), SD Catalog No. C13.48:l. NSRDS-NBS 2, Thermal Properties of Aqueous Uni-univalent

Electrolytes, by V. B. Parker, 1965 (45 cents), SD Catalog No. C13.48:2. NSRDS-NBS 3, Sec. 1, Selected Tables of Atomic Spectra, Atomic Energy Levels and Multiplet Tables, Si ii, Si m,

Si iv, by C. E. Moore, 1965 (35 cents), SD Catalog No. C13.48:3/Sec.l. NSRDS-NBS 3, Sec. 2, Selected Tables of Atomic Spectra, Atomic Energy Levels and Multiplet Tables, Si i, by C. E. Moore, 1967 (20 cents), SD Catalog No. C13.48:3/Sec.2. NSRDS-NBS 3, Sec. 3, Selected Tables of Atomic Spectra, Atomic Energy Levels and Multiplet Tables, C i, C ii, C m,

Civ, Cv, Cvi, by C. E. Moore, 1970 ($1), SD Catalog No. C13.48:3/Sec.3. NSRDS-NBS 3, Sec. 4, Selected Tables of Atomic Spectra, Atomic Energy Levels and Multiplet Tables, N iv, N v, N vi, N vn, by C. E. Moore, 1971 (55 cents), SD Catalog No. C13.48:3/Sec. 4. NSRDS-NBS 4, Atomic Transition Probabilities, Vol. I, Hydrogen

Through Neon, by W. L. Wiese, M. W. Smith, and B. M. Glennon, 1966 ($2.50), SD Catalog No. C13.48:4/Vol.l. NSRDS-NBS 5, The Band Spectrum of Carbon Monoxide, by

P. H. Krupenie, 1966 (70 cents), SD Catalog No. C13.48:5. NSRDS-NBS 6, Tables of Molecular Vibrational Frequencies,

Part 1, by T. Shimanouchi, 1967 (40 cents), SD Catalog No. C13.48:6/Pt.l. NSRDS-NBS 7, High Temperature Properties and Decomposition of Inorganic Salts, Part 1. Sulfates, by K. H. Stern and E. L. Weise, 1966 (35 cents), SD Catalog No. C13.48:7/Pt.l. NSRDS-NBS 8, Thermal Conductivity of Selected Materials, by R. W. Powell, C. Y. Ho, and P. E. Liley, 1966 ($3). PB189698*

NSRDS-NBS 9, Tables of Bimolecular Gas Reactions, by A. F. Trotman-Dickenson and G. S. Milne, 1967 ($2), SD Catalog No. C13.48:9. NSRDS-NBS 10, Selected Values of Electric Dipole Moments

for Molecules in the Gas Phase, by R. D. Nelson, Jr., D. R. Lide, Jr., and A. A. Maryott, 1967 (40 cents), SD Catalog No. C13.48:10. NSRDS-NBS 11, Tables of Molecular Vibrational Frequencies,

Part 2, by T. Shimanouchi, 1967 (30 cents), SD Catalog No. C13.48:ll/Pt.2. NSRDS-NBS 12, Tables for the Rigid Asymmetric Rotor: Trans- formation Coefficients from Symmetric to Asymmetric Bases

and Expectation Values of P|, P£, and P by R. H. Schwendeman, 1968 (60 cents), SD Catalog No. C13.48:12. NSRDS-NBS 13, Hydrogenation of Ethylene on Metallic Catalysts, by J. Horiuti and K. Miyahara, 1968 ($1), SD Catalog No. C13.48:13. NSRDS-NBS 14, X-Ray Wavelengths and X-Ray Atomic Energy

Levels, by J. A. Bearden, 1967 (40 cents), SD Catalog No. C13.48:14.

* Available from National Technical Information Service, Springfield, Virginia 22151.

by international money order or draft on an American bank. Postage stamps are not acceptable.

No charge is made for postage to destinations in the

United States and possessions, Canada, Mexico, and certain Central and South American countries. To other countries,

payments for documents must cover postage. Therefore,

one-fourth of the price of the publication should be added

for postage.

Send your order together with remittance to Superintendent of Documents, Government Printing Office, Washington, D.C. 20402. NSRDS-NBS 15, Molten Salts: Vol. 1, Electrical Conductance,

Density, and Viscosity Data, by G. J. Janz, F. W. Dampier, G. R. Lakshminarayanan, P. K. Lorenz, and R. P. T. Tomkins, 1968 ($3), SD Catalog No. C13.48:15/Vol.l. NSRDS-NBS 16, Thermal Conductivity of Selected Materials, Part 2, by C. Y. Ho, R. W. Powell, and P. E. Liley, 1968 ($2), SD Catalog No. C13.48:16/Pt.2. NSRDS-NBS 17, Tables of Molecular Vibrational Frequencies,

Part 3, by T. Shimanouchi, 1968 (30 cents), SD Catalog No. C13.48:17/Pt.3. NSRDS-NBS 18, Critical Analysis of the Heat-Capacity Data

of the Literature and Evaluation of Thermodynamic Properties of Copper, Silver, and Gold From 0 to 300°K, by G. T. Furukawa, W. G. Saba, and M. L. Reilly, 1968 (40 cents), SD

Catalog No. C13.48:18, NSRDS-NBS 19, Thermodynamic Properties of Ammonia as an Ideal Gas, by L. Haar, 1968 (20 cents), SD Catalog No.

C13.48.-19. NSRDS-NBS 20, Gas Phase Reaction Kinetics of Neufral Oxygen Species, by H. S. Johnston, 1968 (45 cents), SD Catalog No. C13.48:20. NSRDS-NBS 21, Kinetic Data on Gas Phase Unimolecular Reactions, by S. W. Benson and H. E. O’Neal, 1970 ($7), SD

Catalog No. C13.48:21. NSRDS-NBS 22, Atomic Transition Probabilities, Vol. II, Sodium

Through Calcium, A Critical Data Compilation, by W. L. Wiese,

M. W. Smith, and B. M. Miles, 1969 ($4.50), SD Catalog No. C13.48:22/ Vol.l I. NSRDS-NBS 23, Partial Grotrian Diagrams of Astrophyslcal Interest by C. E. Moore and P. W. Merrill, 1968 (55 cents), SD Catalog No. C13.48:23. NSRDS-NBS 24, Theoretical Mean Activity Coefficients of Strong

Electrolytes in Aqueous Solutions from 0 to 100° C, by Walter J. Hamer, 1968 ($4.25), SD Catalog No. C13.48:24. NSRDS-NBS 25, Electron Impact Excitation of Atoms, by B. L. Moiseiwitsch and S. J. Smith, 1968 ($2), SD Catalog No. C13.48:25. NSRDS-NBS 26, Ionization Potentials, Appearance Potentials, and Heats of Formation of Gaseous Positive Ions, by J. L

Franklin, J. G. Dillard, H. M. Rosenstock, J. T. Herron, K. Draxl, and F. H. Field, 1969 ($4), SD Catalog No. C13.48:26. NSRDS-NBS 27, Thermodynamic Properties of Argon from the

Triple Point to 300 K at Pressures to 1000 Atmospheres, by

A. L. Gosman, R. D. McCarty, and J. G. Hust, 1969 ($1.25), SD Catalog No. C13.48:27. NSRDS-NBS 28, Molten Salts: Vol. 2, Section 1, Electrochemistry

of Molten Salts: Gibbs Free Energies- and Excess Free Energies From Equilibrium-Type Cells, by G. J. Janz and C. G. M. Dijkhuis. Section 2, Surface Tension Data, by G. J. Janz, G. R. Lakshminarayanan, R. P. T. Tomkins, and J. Wong, 1969 ($2.75), SD Catalog No. C13.48:28/Vol.2. NSRDS-NBS 29, Photon Cross Sections, Attenuation Coefficients, and Energy Absorption Coefficients From 10 keV to 100 GeV, by J. H. Hubbell, 1969 (75 cents), SD Catalog No. C13.48:29.
NSRDS-NBS 30, High Temperature Properties and Decomposition

of Inorganic Salts, Part 2. Carbonates, by K. H. Stern and E. L. Weise, 1969 (45 cents), SD Catalog No. C13.48:30/Pt. 2. NSRDS-NBS 31, Bond Dissociation Energies in Simple Molecules, by B. deB. Darwent, 1970 (55 cents), SD Catalog No. C13.48:31. NSRDS-NBS 32, Phase Behavior in Binary and Multicomponent

Systems at Elevated Pressures: n-Pentane and Methane-n-Pentane, by V. M. Berry and B. H. Sage, 1970 (70 cents), SD Catalog

No. C13.48:32. NSRDS-NBS 33, Electrolytic Conductance and the Conductances

of the Halogen Acids in Water, by W. J. Hamer and H. J. DeWane, 1970 (50 cents), SD Catalog No. C13.48:33. NSRDS-NBS 34, Ionization Potentials and Ionization Limits Derived from the Analyses of Optical Spectra, by C. E. Moore, 1970 (75 cents), SD Catalog No. C13.48:34.

NSRDS-NBS 35, Atomic Energy Levels as Derived From the Analyses of Optical Spectra. Vol. I, 'H to 23

V; Vol. II, 24 Cr to

41 Nb; Vol. Ill, 42 Mo to 57

La, 72 Hf to 89

Ac, by C. E. Moore, 1971 (In preparation), SD Catalog No. C13.48:35/Vols. I, II, and III. NSRDS-NBS 36, Critical Micelle Concentrations of Aqueous Sur- factant Systems, by P. Mukerjee and K. J. Mysels, 1971 ($3.75), SD Catalog No. C13.48:36. NSRDS-NBS 37, JANAF Thermochemical Tables, 2d Edition, by

D. R. Stull, H. Prophet, et al., 1971 ($9.75), SD Catalog No. C13.48:37. NSRDS-NBS 38, Critical Review of Ultraviolet Photoabsorption

Cross Sections for Molecules of Astrophysical and Aeronomic

Interest, by R. D. Hudson, 1970 ($1), SD Catalog No. C13.48:38.

* GPO : 1972 O - 452- GPO : 1972 O - 452-685
(cut

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