bluuebunny/crossref_metadata_2025_split huggingface dataset:
Das Mikrowellenspektrum von Tert.-Butyljodid Die Analyse von Rotationsspektren mit Quadrupol-Hyperfeinstruktur
Authors: Winkle W. , Hartmann H. 
Published: February 2015

Abstract
Es wird das Mikrowellenspektrum eines symmetrischen Kreisels (tert.-Butyljodid) untersucht, in dem sich die HFS-Komponenten des Schwingungsgrundzustandes mit denen einiger angeregten Vibrationszustände überlagern. Dabei gelingt es, eine allgemeine Methode zur Analyse eines mit den genannten Schwierigkeiten behafteten Spektrums zu entwickeln. Die Auswertung ergibt im Falle des tert.-Butyljodids folgende Konstanten:
e Q q = -1709,5 ± 5,5 MHz, B = 1560,60 ± 0,01 MHz, DJ = 0,20 ± 0,10 kHz, DJK = 0,70 ± 0,07 kHz, rC-J = 2,190 ± 0,005 Å.
Kohärente Kleinwinkelstreuung hochenergetischer Pi-Mesonen an leichten Kernen ( 3He und 4 He)
Authors: Baier Hans 
Published: February 2015

Abstract
The paper discusses recently obtained (theoretical) results on the coherent small angle elastic scattering of high energy pions on the nuclei 3 He and 4 He. Starting with the full suitably parametrized spin- and isospindependent pion-nucleon amplitude for pion laboratory energies between 0.826 and 2.01 GeV the Glauber’s plural scattering formula has been applied to derive the angular distribution of scattered pions. A concise report on the use of coherent high energy processes in the investigation of the nuclear structure and the hadron-nucleon scattering amplitude is given. The advantages and shortcomings as well as possible generalizations of the plural scattering model are outlined. The formalism applied to derive results on the structure of 3 He and 4 He and the conclusions drawn from the results on pion-helium scattering are presented in detail. It has been shown that an effective pion nucleon amplitude may safely replace the full amplitude in the present context and in the energy region mentioned above.
Thermoelectric Properties in Silver Bromide-Alkali Bromide Fused Mixtures
Authors: Pezzati Elisabetta 
Published: February 2015

Abstract
Using a silver electrode thermocell, the initial thermoelectric power of the molten salt mixtures (Ag + Me)Br (Me=Li, Na, K, Rb, Cs) has been measured around 700 °C.
These data enable to obtain relative values of the heats of transport for the alkali cations in pure bromides and also to discuss the behaviour of the mixtures in respect to the heat and electricity transport. Finally a comparison is made with the correspondent values obtained for the alkali chlorides.
Messung der Halbwertszeiten von 60 Co, 137 Cs und 133 Ba
Authors: Walz K. F. , Weiss H. M. 
Published: February 2015

Abstract
The half-lifes of 60 Co, 137 Cs and 133 Ba have been evaluated from measurements of the activities of samples against the activity of a 226 Ra-standard by means of a 4 π-γ-ionization chamber during a period of about 3 years. A least squares fit together with corrections for the decay of 226 Ra, contaminations, and saturation defects leads to the following results:

60 Co: T1/2 = (5,2719 ± 0,0011) a;

133 Ba: T1/2 = (10,352 ± 0,040) a;

137 Cs: T1/2 = (29,901 ± 0,045) a.
Zusammenstellung der Koeffizienten für die Anpassung komplexer atomarer Streufaktoren für schnelle Elektronen durch Polynome 1. Mitteilung: Hartree-Fock-Fall
Authors: Hasse Joachim 
Published: February 2015

Abstract
In der Arbeit werden Formeln und Koeffizienten angegeben, um die Beträge und Phasen der komplexen Streufaktoren für konstante Beschleunigungsspannungen 40, 60, 80, 100, 120 kV und spannungsunabhängig zwischen 40 und 120 kV für Atome der Kernladungszahlen 1 - 36 zu berech-nen.
Induced Nonradiative Transitions in Benzene
Authors: Eastman J. W. 
Published: February 2015

Abstract
A nonradiative electronic transition in benzene occurs at about 2400 cm -1 above the zero-point vibration of the 1B2u electronic state. The rate-determining step may be the vibrational relaxation of the product or the nonradiative transition itself. The rate of the latter is limited to 108 < kAC < 1011 sec-1 in the vapor at 100 torr and kAC ~ 1012 sec-1 in liquids. There are also limiting values in liquids for the threshold energy and the rate of vibrational relaxation of the initial state.
In liquid solutions, the observed transition rate increases with increasing intermolecular force, but it is not increased by alkyl substitutions. Symmetry perturbation and other sources of solventinduced transitions are discussed. Also, means are suggested by which it may be possible to catalyse the formation of benzvalene.
Nichtlokale Elastizitätstheorie der Ionenkristalle vom Typ A+B-
Authors: Kessel D. , Kröner E. 
Published: February 2015

The concept of non-local elastic response is explained. Neglecting retardation effects, the nonlocal elasticity theory of ionic crystals of type A+B- is derived from the atomic lattice theory by means of the Euler-Maclaurin continuization. The electric part of the theory is comprised in material tensor functions which can be calculated from the long range coupling functions (interatomic potentials). The coupling functions are obtained classically on the basis of Coulomb's law and given in ordinary and Fourier space representation. From these functions the optical and acoustical phonon dispersion curves are calculated.
The theory developed here is intended to replace the atomic lattice theory in situations where the lattices sums of the atomic theory are unmanageable
Resonanz-Raman-Effekt von Thiocyanatkomplexen einiger Übergangsmetalle
Authors: Krasser W. , Nürnberg H. W. 
Published: February 2015

Abstract
The thiocyanates of the transition metals iron, cobalt, copper as well as of rhenium and of tech-netium appear in solution as strongly coloured complexes. The resonance raman bands in the sol-vent acetonitrile are investigated. To achieve an unambiguous identification the infrared spectra were recorded too. The change in position and structure of the acetonitrile bands indicates strong complexation of iron, cobalt and copper with acetonitrile, thus indicating the existence of mixed acetonitrile-thiocyanate complexes. The resonance raman spectra of the rhenium-and technetium-thiocyanates present as tetramethyl ammonium salts show however no raman-and infrared-bands of complexed acetonitrile molecules.
In the raman spectrum of the thiocyanates of iron, cobalt and copper mainly the totally sym-metric C≡N, S-C, Me-S and Me-N valence vibrations are observed, among which the S-C vibration shows a remarkably high intensity. Besides, a series of bands is obtained which is inter-preted partly as caused by decay products, and partly as bands of complexed acetonitrile. The thiocyanates of rhenium and of technetium show the three possible valence vibrations only. The high frequency of the S-C valence indicates the N-coordination of the thiocyanate group.
Integrale Wirkungsquerschnitte der Reaktion 11B(n,α)8Li(β)8Be*(2α)/ Integral Cross Sections of the Reaction 11B(n,α)8Li(β)8Be*(2α)
Authors: Scobel W. , Bormann M. 
Published: February 2015

Abstract
The excitation function of the reaction 11B(n,α)8Li(β)8Be*(2α) has been measured for neutrons with energies between 15.5 and 19 MeV. The reaction was identified by the α-decay of the 8Be* occurring with the lifetime of the residual nucleus 8Li. The detector for the α-particles was a gridded ionization chamber.
Light Emission in the VUV by Dissociative Excitation of CO2 with Low-Energy Electrons
Authors: Sroka W. 
Published: February 2015

Abstract
The CO2 molecule is dissociated in a single step process by an electron into excited atoms or ions which emit a radiation in the vuv. There are 34 radiation components from C II, O II, C I, O I and CO in the wavelength region from 450 Å to 1450 Å. We have measured the excitation functions and the dependencies of the line intensity on beam current and pressure. The excitation functions of most of the O I multiplets show a pronounced structure at about 20 to 50 eV. Immediately above the first critical potential these levels are populated via partial dissociation of CO2. About 2% of the ions (C II and O II) formed by dissociative ionization are excited and emit a radiation in the vuv.
An Apparatus for Non Destructive Study of Atom Transport in Liquids
Authors: Larsson S. , Broman L. , Roxbergh C. , Lodding A. 
Published: February 2015

Abstract
A description is given of a method developed for diffusion and electrotransport measurements in liquids, which permits several successive readings on a sample in uninterrupted anneal. Errors from solidification and sectioning are avoided, and the reproducibility of measured diffusion coefficients is better than two percent. Experimental results are given for gallium self-diffusion. The present apparatus can be conveniently applied to many liquids solidifying below some 280 °C utilizing gamma tracers with energies in the range 0.2 - 2.0 MeV. The design can be modified for higher temperatures.
Miscibility Gaps in Fused Salts
Authors: Flor Giorgio , Sinistri Cesare 
Published: February 2015

Abstract
The two families of systems formed by silver halides with alkali Chromates and tungstates have been systematically investigated in order to bring into evidence possible demixing phenomena. It has been found that silver chloride demixes with lithium Chromate and tungstate and with sodium tungstate; silver bromide demixes with lithium and sodium Chromates and tungstates; silver iodide demixes with lithium, sodium and potassium Chromates and tungstates. Moreover the whole compo-sition square of the ternary reciprocal system Ag, Na/Cl, WO4 has been investigated.
The tendency to demix in these systems has been discussed on the basis of the characteristics of the ions.
Untersuchung der Diffusion von Wasserstoff in Pd- und Pd/Ag-Legierungen mit einer Stromstoß-Methode
Authors: Züchner H. 
Published: February 2015

Abstract
Diffusion coefficients of H in Pd and Pd/Ag-alloys were determined at low hydrogen concentration and at temperatures between 0 and 60 °C by a new electrochemical pulse method making use of time-lag-techniques.
The preexponential factor D0 decreases slightly with rising silver content (x=weight % Ag/100) : log D0=-2.409-1.0 x.
The activation energy runs through a flat minimum at about 15% Ag. Its dependence on the silver content of the alloy 0 ≦ x ⪅ 0.5 can be expressed empirically by
E=5750-5285 x+19100 x2 cal/mol.
Notizen: Nuclear Quadrupole Resonance of N14 in Pyridine Complexes
Authors: Ha Tae-Kyu , O'Konski C.T. 
Published: February 2015

Abstract
Shifts in the nuclear quadrupole coupling are detected for N14 in pyridine complexes by pure nuclear quadrupole resonance spectroscopy (NQR). These are compared with values obtained by the Townes-Dailey method using a simple molecular-orbital (MO) calculation for the pyridine-pyrrole system.
Dynamic Polarization, Molecular Motion and Solvent Effects in Several Organic Solutions as Studied by Proton-Electron Double Resonance
Authors: Müller-Warmuth W. , Öztekin Erol , Vilhjalmsson Reynir , Yalçiner Aytaç 
Published: February 2015

Abstract
Dynamic proton polarization in several free radical solutions has been studied systematically with different radicals at five widely separated magnetic field strengths and at various temperatures. Normally, in organic solutions the dynamic enhancements of the solvent proton resonances decay with increasing field and decreasing temperature. Scalar proton-electron coupling has only been observed in exceptional cases. The spectral intensity functions describing the experimental behaviour are derived from the dipolar interaction whose time dependence is in the first place due to translational diffusion of individual molecules. In addition, a certain solvation effect has to be taken into account. Strong solvation occurs in solutions of hydroxyl containing solvents with nitroxide radicals. In this case, the dynamic proton polarization appears to be quite different. As an example, solutions of tetramethyl piperidineoxyl in acetic acid have been examined in more detail. The results are explained in terms of hydrogen bridged solvates. The important motional mechanism that modulates the proton-electron interaction switches from “translation” to “rotation”, and electron spin density is temporarily transferred to the solvent molecule.
Hindered Rotation in Biphenyl According to a Selfconsistent Steric Analysis
Authors: Gołbiewski A. , Parczewski A. 
Published: February 2015

Abstract
A selfconsistent steric conformation analysis is applied to the ground state, first excited state and the ionic state of biphenyl in terms of the internal rotation angle. The calculated barrier of rotation through Θ = o° is equal to 3.1 kcal/mole. In the case of the isolated anion the twisting angle equal to 26° was obtained. In the case of solutions the angle is 15 - 19°, the value following from an analysis of the EPR data published by Möbius. The electronic absorption spectrum is discussed in terms of the SCF CI method. The results are compared with other recent calculations.
Quantenchemische und spektroskopische Untersuchungen an Porphyrinen
Authors: Knop J.V. , Knop A. 
Published: February 2015

Abstract
Zur Deutung der Elektronenanregungsspektren der freien Base Porphin und des Zn-Porphins wurden SCF-CI-Berechnungen mit Berücksichtigung aller 143 einfach angeregten Konfigurationen durchgeführt.
Es konnten neue Gesichtspunkte zur Zuordnung der Elektronenübergänge im Absorptionsspek-trum gewonnen werden. Ihre Lage, Intensität und Polarisation stehen in sehr guter Übereinstim-mung mit dem Experiment.
Ferner konnten die von Woodward auf experimentellem Wege gemachten, sehr präzisen Voraus-sagen über die Ladungsverteilung im Porphin voll bestätigt werden.
Quantenchemische und spektroskopische Untersuchungen an Porphyrinen
Authors: Knop J.V. , Knop A. 
Published: February 2015

Abstract
Im Anschluß an die Deutung der Elektronenanregungsspektren der freien Base Porphin und des Zn-Porphins wurden audi SCF-CI-Berechnungen der mono-und divalenten Ionen des Porphins, unter Berücksichtigung aller 143 einfach angeregten Konfigurationen, durchgeführt.
Soweit experimentelles Material vorhanden war, konnte eine befriedigende Übereinstimmung mit den theoretischen Ergebnissen erzielt werden.
Notizen: Centrifugal and Gravitational Cells Containing Molten Salts with Three Ion Constituents
Authors: Richter Joachim 
Published: February 2015

Abstract
Since recently 1 the first experimental data on cen-trifugal and gravitational cells containing molten salts have been published, the rigorous derivation of the formulae for the EMF of this type of galvanic cells will now be given. The corresponding formulae for aqueous electrolyte solutions have been obtained by MILLER 2 and indepen-dently by SCHÖNERT 3 who also included polyelectro-lyte solutions. Both authors refer to experimental in-vestigations of TOLMAN 4 , GRINNEL and KOENIG 5 ,
The Role of Starting Potential in the Kinetics of Chemical Reactions under Electrodeless Discharge
Authors: Ao T.S.R , Patil A. 
Published: February 2015

Abstract
It has been shown that in kinetically first order gas phase reactions occuring under electric discharge, such as the decomposition of N2O, the application, at various initial pressures, of the same multiple of the respective starting potential ensures that the reaction occurs at the same specific rate.
The Mößbauer Effect of the 129 keV Transition in 195Pt
Authors: Wolbeck B. , Zioutas K . 
Published: February 2015

Abstract
The Mößbauer effect of the 129 keV transition in 195Pt has been observed. By use of a Ge(Li) detector any contribution from the strong 99 keV Mößbauer line could be eliminated. The width of the resonance absorption line corresponds to the natural line width. We derived from the magnitude of the observed Mößbauer effect the branching ratio in the decay of the 129 keV level as I (129)/I (31) = ( 5.7 ± 1.6)% .
Heating of Laser Produced Plasmas Generated at Plane Solid Targets I. Theory
Authors: Theory I. , Puell H. 
Published: February 2015

Abstract
A hydrodynamic model for the heating of a plasma generated by the interaction of an intense giant laser pulse with a plane, solid target is developed. It is shown that in the case of nanosecond light pulses and a finite focal spot diameter, the plasma production may be considered as a steady state problem. Expressions for the electron temperature, the expansion energy of the ions, and the total particle number in the plasma as a function of the incoming light intensity are derived. An estimate of the ion temperature is discussed.
Temperature and Expansion Energy of Laser Produced Plasmas II. Experiments
Authors: Puell H. , Neusser H.J. , Kaiser W. 
Published: February 2015

Abstract
Experiments on laser produced plasmas with light intensities between 2·1011 and 5·1012 W/cm2 are reported. Measurements of the electron temperature and the expansion energy were performed. In the case of LiD targets the highest temperature observed was 200 eV. Using carbon targets a maximum temperature of 330 eV was measured. The corresponding expansion energies reach values as high as 13 keV. The experimental results are in good agreement with a stationary, hydrodynamic theory. We conclude from our data that in our LiD and C plasmas ions and electrons have the same temperature.
Über den Hamilton-Operator der Schwingungs-Rotations-Bewegung linearer Moleküle / On the Vibration-Rotation Hamiltonian of Linear Molecules
Authors: Strey G . 
Published: February 2015

Abstract
A closed expression for the vibration-rotation hamiltonian of linear molecules is derived and discussed. By use of the commutation relations and sum rules this expression is then rearranged to a form similar to that of WATSON1 for nonlinear molecules.
Partielle Interferenz-und partielle Atomverteilungsfunktionen sowie elektrischer Widerstand von geschmolzenen Magnesium—Zinn-Legierungen
Authors: Bühner H.F. , Steeb S. 
Published: February 2015

Abstract
From measured intensity functions, published in a previous paper, partial interference functions, partial pair correlation functions, partial atomic distribution functions, and partial coordination numbers were calculated and discussed. According to the theory of Faber and Ziman, the electrical resistivity of molten Mg-Sn alloys was calculated from the partial interference functions and from pseudopotentials reported by Animalu and Heine. The calculated values, being normalized to the resistivity of the molten components, are in good agreement with values measured by a rotating field method.
The partial interference functions are derived by the assumption of independency of concentration. This assumption is proved by discussion of the partial coordination numbers and the results of electrical resistivity determinations.
Untersuchung zur Keimbildung von Gold auf NaCl-Einkristallspaltflächen im Ultrahochvakuum
Authors: Schmeisser H. , Harsdorff M . 
Published: February 2015

Abstract
The present paper presents the results of an investigation of the nucleation process during the formation of evaporated gold films on UHV cleaved rocksalt single crystals. The dependence of the nucleation rate and the sticking coefficient on the substrate temperature and deposition rate has been studied in detail. The results are interpreted in terms of a kinetic nucleation model. It is shown that this interpretation based upon atomistic considerations is successful and allows to determine the main model parameters, such as the binding energy of the single atom to the substrate or the activation energy of surface diffusion. An upper limit can be given for the jump distance of the single atom.
Determination of Vibrational Resonance Parameters in the Spectra of Polyatomic Molecules
Authors: Wlnther F. 
Published: February 2015

Abstract
An approximation method for determination of vibrational resonance parameters, based upon the invariance of anharmonicity constants against phase changes, is described. Several examples, including resonances in the spectra of CO2, OCN-, CH3I, and some 1,1-disubstituted ethylenes, are given.
The Electrical Conductivity and Density of the Molten Systems Li2S04 —ZnSO4 and Na2SO4 —ZnSO4
Authors: Josefson Ann-Mari , Kvist Arnold 
Published: February 2015

Zinc sulphate decomposes upon melting. Molten Li2SO4 -ZnSO4 and Na2SO4 -ZnSO4 are thermally stable with up to 80 mole% of ZnSO4 . We have measured the density and electrical conductivity of these melts. By extrapolation we have calculated the density (ϱ) and molar electrical conductivity (Λ) of pure molten zinc sulphate and we have obtained (t in °C)
ϱZnSO4 = 3.463 - 0.470 x 10-3 t(g/cm3),
ΛZnSO4 = 0.0950 t-35.4 (cm2/ohm, mole).
Nuclear Magnetic Relaxation in a Gas of Regular Molecules
Authors: Mccourt F.R. , Hess S. 
Published: February 2015

Abstract
Nuclear magnetic relaxation (NMR) in a gas of regular (tetrahedral and octahedral) molecules from the point of view of the kinetic theory of transport and relaxation processes based on the Waldmann-Snider equation is considered. A simple expression is obtained for the spin-rotation interaction based on considerations of the molecular symmetry. The form of the spin-rotation coupling which contains, in addition to the so-called "scalar" coupling constant, also a scalar anisotropy part, ⊿c, of the spin-rotation coupling tensor determines, along with the collision operator, the form to be taken by an expansion of the nonequilibrium part of the distribution function-density matrix of the gas. Solutions of the set of coupled differential equations which follow upon application of the moment method to the linearized Waldmann-Snider equation lead to the Bloch equations which define the "spin-lattice" and transverse relaxation times in the gas. Those obtained here are com-parable with those obtained using correlation function theory. However, in this work, due to explicit consideration of the molecular symmetry, it is shown that the "effective" spin-rotation coupling coefficient found in tetrahedral and octahedral molecules is not the same and depends in a simple way on the number of equivalent spins in the molecule.
Zur experimentellen Prüfung des theoretischen Ausdrucks für die Rydberg-Konstante
Authors: Zygan H. 
Published: February 2015

Abstract
Berechnungen der fundamentalen Naturkonstanten aus geeigneten Präzisionsmessungen führen zu dem Ergebnis, daß sich die Werte der Elementarladung, der Elektronenmasse, des Planckschen Wirkungsquantums und der Avogadro-Konstante ebenso wie die daraus berechneten Werte der Sommerfeldschen Feinstrukturkonstante a um etwa 0,2%o unterscheiden, wenn diese Werte einmal nur aus solchen Präzisionsmessungen, die von der Theorie des Einelektronen-Atoms keinen Gebrauch machen und ein zweites Mal mit Benutzung des gemessenen Wertes für die Rydberg-Konstante berechnet werden. Zwischen der gemessenen Rydberg-Konstante und dem theoretischen Wert, der sich aus den ohne Benutzung der Atomtheorie erhaltenen Naturkonstanten errechnet, wird ein Unterschied von über 0,4%o gefunden.
Zur endgültigen experimentellen Bestätigung oder Auflösung dieser Diskrepanz wird eine neue Mehode für die direkte Präzisionsmessung der Elementarladung angegeben.
Anorganische Flüssigkeitslaser
Authors: Weichselgartner H. , Perchermeier J. 
Published: February 2015

Abstract
Anorganische Flüssigkeitslaser basieren heute auf Phosphoroxychlorid, POCl3 , als Lösungsmittel für verschiedene Neodymsalze. Je nach verwendeten Lewis-Säuren, beispielsweise Aluminiumchlorid, liegen die Fluoreszenzlebensdauern bei Werten um 330 μsec. Es werden neue Lösungsmittel, Neo-dymverbindungen und Lewis-Säuren und das Addukt Nd2[(SnCl6)2-]3 beschrieben.