bluuebunny/crossref_metadata_2025_split huggingface dataset:
Notizen:The G eneralised Mean Square Amplitudes of Vibration for Substituted Ethylenes Vinylidene Halides and their Deuterates
Authors: Jeyapandian S. 
Published: February 2015

Abstract
For six vinylidene halides the generalised mean square amplitudes of displacements parallel and perpendicular to the bond for both bonded and non-bonded atom distances are cal­culated from spectroscopic data using the method of Morino and Hirato. The results are discussed and the mean amplitu­des of these molecules (H2C=CX2) are compared with those from electron diffraction data for the similar molecules of the type C2X4.
Thermodynamik heterogener Gasgleichgewichte III. Gasphasenzusammensetzung und chemische Transportreaktionen im System Wolfram-Sauerstoff
Authors: Neumann G. M. , Gottschalk G. 
Published: February 2015

Die Gasphasenzusammensetzung des heterogenen Systems Wolfram-Sauerstoff wurde mit Hilfe von Computerprogrammen für Temperaturen von 1500 -3600 °K und für Sauerstoff-Anfangsdrucke von 1 - 10-6 atm berechnet. Es zeigt sich, daß bei niedrigen Temperaturen (T<1600 -1900 K) neben festem Wolfram auch festes Wolframoxid vorliegt, so daß in diesem Temperaturbereich die Zusammensetzung der Gasphase unabhängig von den Sauerstoff-Ausgangsdrucken bleibt und nur durch das feste Wolframoxid bestimmt wird.
Im Bereich höherer Temperaturen (T >2000 K) findet in offenen Systemen ein chemischer Transport von Wolfram über seine Oxide statt. Die Transportrichtung verläuft zunächst von kalt nach heiß und kehrt sich bei sehr hohen Temperaturen um und verläuft dann von heiß nach kalt. Das Einsetzen der Transportreaktion und die Umkehr der Transportrichtung weist dabei eine Abhängigkeit vom Sauerstoff-Ausgangsdruck auf.
Die Berechnungsergebnisse werden durch experimentelle Beobachtungen der Literatur bestätigt.
Notizen: The Pyroelectric Effect in Lithium doped Cadmium Sulfide
Authors: Deeg W. , Gobrecht H. , Nelkowski H. 
Published: February 2015

Abstract
CdS crystals highly doped with Li, showing the tap-effect1 have pyroelectric constants considerably higher than those reported by MINKUS 2 for pure CdS crystals. The differences of the surface charges during cooling and heating can be ex­ plained by considering the exponential temperature dependence of the electric conductivity of the crystals.
On a Unified Theory of Twocentre Harmonic Oscillator Integrals
Authors: Wltschel W . 
Published: February 2015

Abstract
Twocentre harmonic oscillator overlap integrals (Franck-Condon-integrals) are calculated in a simple way for twodimensional oscillators of different frequencies. Second quantization and operator technique are applied. It is further shown that transition and kinetic energy integrals can be derived in the same representation.
Bemerkungen zur Phononen-Wechsel Wirkung in Polymeren
Authors: Baur H. 
Published: February 2015

Abstract
The stiffness of the polymer chains provokes a part of the acoustical low frequency phonons in polymer crystals to behave like free particles charged with mass, as far as their energy-momentum-relation is concerned. The influence of this "mass" on the 3-phonon-processes and on the phonon-electron-interaction in the isolated linear chain, in a Bravais lattice built up of linear chains, and in the isolated planar zig-zag-chain is investigated. It is shown that the "inert" phonons are especially exposed in the case of phonon-phonon-and phonon-electron-interaction.
Supraleitung der A 15-Phase im System Nb—Al—Si
Authors: Müller A. 
Published: February 2015

Abstract
Im System Nb -Al-Si mit mehr als 60 At.-Proz. Niob wurde der isotherme Schnitt bei 1840 °C untersucht. Im Bereich von 75 bis 80 At.-Proz. Niob und 0 bis 7 At.-Proz. Silicium existiert A 15-Phase. Phasenfeld und Gitterkonstanten sowie kritische Stromdichten und kritische Temperaturen der supraleitenden A 15-Phase werden mitgeteilt. Bei einphasigen Proben Nb75,3Al21.5Si3.2 wird im ternären System die höchste Sprungtemperatur von 19,2 K beobachtet.
The Mössbauer-Effect o f the 104 keV Transition in 180W
Authors: Zioutas K. , Wolbeck B. 
Published: February 2015

Abstract
The Mössbauer effect of the 2 + (104 keV)0+ transition in 180W has been observed. The source was 180Ta which was produced by irradiation of a foil of natural tantalum by fast neutrons: 181Ta(n, 2n) 180Ta. The width of the resonance absorption line was (3 .1 ± 0.8) mm/sec which corresponds to the linewidth derived from lifetime measurements.
Bestimmung einer empirischen Formel zur Abschätzung der im ultravioletten Spektralbereich liegenden VK-Absorptionsbande
Authors: Podszus B. 
Published: February 2015

Abstract
An empirical relation has been found between the ionic radii of the crystal-lattices and the ultraviolet absorption wavelengths of the VK-centers. The relation is valid for VK - centers formed in alkali halide crystals with NaCl structure as well as for ammonium halide crystals with CsCl structure.
The Spectrum of Steady State Turbulent Convection
Authors: Winterberg F. 
Published: February 2015

Abstract
Based on Heisenberg's statistical theory of turbulence, a model for steady state turbulent convection is herein proposed, and on the basis of this model, equations for the energy spectrum for steady state turbulent convection are derived. The spectrum is obtained from the solution of a nonlinear integral equation. After the integral equation is brought into a universally valid nondimensional form, it is transformed into a nonlinear first order differential equation to be solved numerically, with the Rayleigh number appearing as the only parameter. The energy spectrum has a substantial deviation from the Kolmogoroff law, as a result of the buoyancy force acting on the rising and falling eddies. The presented theory may be applicable to convection in planetary and stellar atmospheres wherein the radiative heat transport is small.
Application of Homonuclear INDOR to a Study of the PMR Spectrum of 15N-pyrrole
Authors: Rahkamaa Erkki 
Published: February 2015

Abstract
Homonuclear INDOR method has been applied to investigate the assignment of some lines of the PMR spectrum of 15N-pyrrole to the transitions in the energy level diagram of the AA'BB'C spin system. This study, based on the characters of some connected transitions and the corresponding line positions, shows that the couplings 1JNH , 2JNH and 3JNH carry the same signs, which is in accordance with a result obtained by the tickling method.
The Isotopic Abundance of Neon, Argon and Krypton
Authors: Melton Charles E. , Massey W . , Abels B . N. 
Published: February 2015

Two research mass spectrometers combined with careful experimental techniques have been used to redetermine the iotopic abundances of atmospheric neon, argon and krypton. No instrumental correction factor was necessary to duplicate the known results for neon. The new isotopic abundance of argon is essentially identical to that previously obtained by Nier. On the other hand, some differences in the present and previous values were noted in the isotopic abundance of krypton. The new values for the nuclides of krypton are

78Kr=0.355±0.001, 83Kr=11.536±0.009 ,

80Kr=2.256±0.007 , 84Kr = 56.982 ± 0.01 ,

82Kr=11.553±0.009 , 86Kr=17.318±0.009 .
The atomic weight calculated on the basis of these new values and 12C= 12.0000 is 83.8005 ± 0.001 amu.
Quantenchemische Untersuchungen an Acetylen, Tetrachloroaluminat(III)-ion und Lithiumtetrachloroaluminat(III)
Authors: Drossbach P. , Hoff H. 
Published: February 2015

Abstract
Die Moleküle bzw. Ionen C2H2, AlCl4
- und LiAlCl4 wurden unter Berücksichtigung aller ihrer Elektronen nach dem SCF-MO-LC-LCGO-Verfahren berechnet. Orbitalenergien, Besetzungsarten Orbitalschwerpunkte und Dipolmomente wurden mitgeteilt. Die Röntgen-Terme werden im Vergleich zu den freien Atomen durch die chemische Bindung in den Molekülen nicht nur abgesenkt, sondern können durch die Elektronenwechselwirkung auch angehoben werden. Die Entladung eines Ions bei gleichzeitigem Übergang mehrerer Elektronen wird diskutiert,
Recovery of the NMR Signal of Plastically Deformed Alkalijodide Single Crystals
Authors: Kanert  , Kotzur D. 
Published: February 2015

Abstract
The annealing process of plastically deformed RbJ-and KJ-single crystals has been studied by means of NMR wide line and spin echo measurements on J127 . The mean lattice strain produced by the deformation is correlated with a mean quadrupole perturbation affecting the NMR signal. Resulting from second order quadrupole effects, the wide line measurements lead to a recovery temperature, which is much lower than the "real" recovery temperature given by the spin echo method. Nevertheless the evaluation of both types of measurements results in the same effective activation energy depending on the degree of deformation. The obtained values are probably caused by the migration of positive ion vacancies.
Beeinflussung des spezifischen Widerstandes und der Thermokraft aufgedampfter Nickelfilme durch Kohlenmonoxid-und Wasserstoff adsorption bei 273 °K
Authors: Welder G. , Reichenberger H. , Wenzel H. 
Published: February 2015

Abstract
An unter Ultrahochvakuumbedingungen aufgedampften Nickelfilmen werden bei 273 °K die durch die Kohlenmonoxid-und Wasserstoffadsorption hervorgerufenen Änderungen des spezifischen Widerstandes und der Thermokraft in Abhängigkeit von der Dicke der Metallfilme und der Belegung untersucht.
Es wird gezeigt, daß die beobachteten Effekte von der Größenordnung sind, wie sie auch bei einigen binären Legierungen des Nickels gefunden werden und daß sich ihre Abhängigkeit von der Schichtdicke qualitativ mit einem Ansatz beschreiben läßt, bei dem die adsorbierten Teilchen als punktförmige Streuzentren betrachtet werden. Abweichungen bei sehr dünnen Filmen und die Größe der Thermokraftänderung deuten auf zusätzliche Einflüsse hin.
Anisotropie galvanomagnetischer und thermomagnetischer Effekte in verschieden dotiertem Bi88Sb12
Authors: Fay B. , Schneider G. 
Published: February 2015

Abstract
Verschieden dotierte Bi88Sb12-Proben wurden durch Zonenschmelzen hergestellt. Neben dem Donator Te interessierten dabei besonders verschiedene Akzeptordotierungen; die Akzeptorwirkung der aus verschiedenen Gruppen stammenden Elemente Sn, Ga, Cd und Ag nimmt entsprechend der angegebenen Reihenfolge ab. Dabei wurde der Einfluß auf die Temperaturabhängigkeit der elektrischen Transportgrößen, wie den elektrischen Widerstand und die Thermokraft, untersucht. Systematische Untersuchungen des Einflusses der Dotierungen auf die Anisotropie der transversalen magnetischen Widerstandsänderung wurden durchgeführt, wobei weiter die Abhängigkeit von der Größe des Magnetfeldes und der Temperatur studiert wurde. Die auftretenden Änderungen der Anisotropien werden diskutiert. Ganz entsprechende Untersuchungen über die Anisotropie der Thermokraft im transversalen Magnetfeld schließen sich an.
Electrical Transport Phenomena in Molten Salts
Authors: Timmermann E. O. , Richter J. 
Published: February 2015

Abstract
The equivalent conductivity of molten salts containing more than two ion constituents will be discussed using the equivalent fractions (Äquivalentanteile). The ionic conductivities of the ion constituents follow from this equivalent conductivity and the transport numbers. The electrical transport phenomena are referred to the idealized ionic melt which is defined by the limiting values of the ionic conductivities of the ion constituents in the pure components. The equations are calculated for the system KNO3+AgNO3.
Es wird die Äquavilentleitfähigkeit bei Salzschmelzen mit mehr als zwei ionischen Bestandteilen mit Hilfe von Äquivalentanteilen diskutiert. Aus dieser Äquivalentleitfähigkeit und den Überführungszahlen ergeben sich mit den Äquivalentanteilen die Ionenleitfähigkeiten der ionischen Bestandteile. Die elektrischen Transportphänomene werden auf eine idealisierte Salzschmelze normiert, die mit den Grenzwerten der Ionenleitfähigkeiten der ionischen Bestandteile in den reinen Komponenten definiert wird. Die Gleichungen werden berechnet für das System KNO3+AgNO3.
Functional Quantum Theory of Scattering Processes. III
Authors: Stumpf H. , Engeser W. , Illig K. 
Published: February 2015

Abstract
Dynamics of quantum field theory can be formulated by functional equations. To develop a complete functional quantum theory one has to describe the physical information by functional operations only. The most important physical information of elementary particle physics is the matrix. In this paper the functional S-matrix is constructed for nonrelativistic spin 1/2 fermions, as in this system a rigorous construction of operator representations is possible. The method of S-matrix derivation used in I and II is improved and the exact perturbation solution for the scattering functionals is given.
Can Quantum Theory be presented as a Classical Ensemble Theory?
Authors: Ochs Wilhelm 
Published: February 2015

Abstract
We examine the possibility of reformulating quantum theory (QT) as a deterministic ensemble theory which (a) interprets observables as objective properties of physical systems and (b) coincides with QT in all quantitative statements. As will be demonstrated, such an Ensemble-Quantum-Theory (EQT) can only be constructed if (1) one accepts a modified observable-concept, and (2) as long as the theory of measurement is left out of account. A correct treatment of the measuring process is impossible within such an EQT. Consequently, there exist no Hidden-Variable Theories with the properties (a) and (b).
Beiträge zum Stark-Effekt der Moleküle 205Tl19F und 39K19F / Contributions to the Stark-Effect of the Molecules 205Tl19F and 39K19F
Authors: Dijkerman H. , Flegel W. , Gräff G. , Mönter B. 
Published: February 2015

Abstract
The dominant contribution to the Stark-effect energy of polar 1Σ diatomic molecules can be calculated from the model of the rigid rotator. Additional terms arise from the anharmonicity of vibration, the centrifugal distortion, the vibration-rotation interaction and the electronic polarizability.
These contributions to the Stark-effect have been investigated for the molecules 205TlF and 39KF with a molecular beam electric resonance apparatus suitable to detect rotational transitions. Measure-ments have been performed at values of electrical field corresponding a) to a minimum in the frequency for the transition (J, mJ) = (1, 0) → (2,0) for vibrational states v = 0, 1, 2 and b) cor-responding to the electrical field where the transitions (J, mJ) = (1, 0) (0, 0) and (1, 0) → (2, 0) for v = 0 occur at the same frequency.
Interpretation of our data requires more precise values of the Dunham coefficients than have been published to date. These coefficients therefore have been recalculated from rotational transitions measured at zero electrical field.
Thermodynamic Properties of Alkali Nitrate—Silver Nitrate Melts
Authors: Richter J. , Sehm S. 
Published: February 2015

Abstract
EMF measurements were performed on a chemical cell containing a silver and a nitrate electrode. The systems NaNO3 + AgNO3 , LiNO3 + AgNO3, and pure AgNO3 were investigated in a temperature range of 240 °C to 310 °C and in the total concentration range permitted by the phase diagram. We found a linear dependence of the EMF on temperature. Six constants, characteristic for the investigated molten salts depending neither on composition nor on temperature, were determined by the analytical construction of the activity coefficients. Together with the analytically constructed excess molar Gibbs function, the excess molar entropy was calculated from calorimetric data in the literature.
Die kinetischen Konstanten des Triplett-Zustandes von Fluoren-Molekülen / The Cinetic Constants of the Triplet Stale of Fluorene Molecules
Authors: Sixl H. , Wolf H. 
Published: February 2015

Abstract
The metastable triplet state T1 of fluorene molecules in a fluorene crystal, disturbed by the presence of dibenzothiophene (“X-traps”) was investigated at 1.6 and 4.2 °K. From ESR measurements a model for the fluoren X-traps is derived. The X-trap molecule is misoriented by an angle of 2,5° in the fluorene crystal.
The rate constants for population (s), radiative decay (kD) and total decay (k) of the three magnetic sublevels of T1 were determined by analysis of phosphorescence intensity and decay time in high magnetic field and by optically detected ESR. We find (with z = axis perpendicular to the molecule, x = long axis):

The average spin lattice relaxation rate constant is w = (0.8 ± 0.2) sec- 1 .
Notizen: Zur Beteiligung des Triplettzustandes im Kristall an der sensibilisierten Erzeugung von Defektelektronen in aromatischen Kohlenwasserstoffen
Authors: Willig F. 
Published: February 2015

Abstract
The steady-state spatial distribution has been calculated for triplet excitons generated at the surface of an anthracene crystal. The dependence on the light intensity has been discussed for a hole generation and delayed fluorescence, due to the triplet excitons.
Notizen: Reactivation of Mechanical Aftereffect of Iron Single Crystals by Discontinuous Change of External Magnetic Field
Authors: Markert H. 
Published: February 2015

Abstract
First experiments on iron single crystals are outlined demonstrating that the mechanical aftereffect can be reactivated remarkably by discontinuous changes in superimposed magnetic fields. As magnetostrictive effects not only are very much smaller but can also be separated experimentally, it appears to be necessary to interpret the observed phenomena by interactions between domain walls and dislocations having mutual orientations suitable to enable reactivation of disclocation glide caused by the repulsive interaction forces of the domain walls.
Diffraction Patterns Obtained by Scanning Electron Microscope
Authors: Fujimoto F , Komaki K , Takagi S , Koike H 
Published: February 2015

Abstract
Kossel-Möllenstedt and Kikuchi patterns are obtained by transmission scanning electron microscopy and compared with those obtained by the convergent beam technique from the same portion of the specimen. The identity of corresponding patterns obtained by both techniques shows the validity of the reciprocal theorem in electron diffraction for both elastic and inelastic scattering. The variations of Kossel-Möllenstedt patterns with the conditions of the incident beam and the position of the detector are also shown.
Der Einfluß starker elektrischer Felder auf Intensität und Lage der Bragg-Reflexe / The Influence of Strong Electrical Fields on Intensities and Positions of Bragg-Reflections
Authors: Chrpa E , Ihringer H , Jagodzinski H , Kneifel A 
Published: February 2015

Abstract
Die Volumenpolarisation, die man durch die Einwirkung von elektrischen Feldern mit einer Feldstärke bis zu 106 V/cm berechnet, sind so klein, daß man nur geringfügige Polarisationen und Verschiebungen der Atome erhält. Sie sind aber mit modernen Meßmethoden der Rüntgen-Streuung an Einkristallen nachweisbar. Im Falle des LiF wird gezeigt, daß die gemessene relative Atom-verschiebung ca. 4·10-3 Å beträgt und etwa eine Größenordnung höher liegt als der theoretisch berechnete Wert.
Wesentlich stärkere Abweichungen werden an Quarzkristallen beobachtet. Hier gelingt die Deutung der beobachteten Intensitätsänderungen über Atomverschiebungen nicht; wahrscheinlich liegt daher ein Zusammenwirken von Atomverschiebungen und Extinktionsminderung durch elektrisch geladene Gitterstörungen vor. Die Verwendung des Effekts für die Strukturanalyse wird diskutiert.
Untersuchungen an stromstarken Kapillarentladungen. Teil I. Vorbereitende Untersuchungen / Investigations on High Current Capillary-Discharges. Part I: Preliminary Investigations
Authors: Kusch Hans Jürgen , Schreiber Harald 
Published: February 2015

Abstract
A pulsed discharge through plastic capillaries is investigated using spectroscopic and cinematographic techniques. In the wavelength region 2600 - 5600 Å the emission was nearly that of a black body of 30 000 °K lasting for nearly 150 μsec; therefore the light source can be used as a suitable radiation-standard in μsec-spectroscopy. The optical thickness is measured and compared with calculations of continuum-intensity. Estimates of pressure and electron density lead to values of 150 atm max. and 2·1019 cm-3 respectively. Also the plasma jet protruding from the capillary is investigated.
Diffusion of He, Ne, and Ar in Vitreous and Partially Devitrified Germani um Dioxide
Authors: Brandt W.W. , Rauch B. , Wagner J. 
Published: February 2015

Abstract
The diffusion coefficients of He, Ne, and Ar in various samples of GeO2 and approximate values for the corresponding solubility coefficients were obtained from nonisothermal and isothermal desorption experiments. The data show trends similar to those obtained on fused SiO2 , and are interpreted by assuming that the glasses contain many interstices of different critical dimensions and a variety of diffusion paths corresponding to a range of activation energies. Some annealed and partially devitrified samples were studied and the activation energies of diffusion were found to be relatively high. In a few cases, the measurements were extended into and above the glass transition range (∼570°) ; the resulting activation energy and the preexponential factor of the Arrhenius equation for the diffusion coefficient were markedly increased, indicating that the diffusion mechanism is probably drastically changed.
Spin Effects in the Two-particle Equati on of the Exciton
Authors: Zwanzger J , Muschik W , Haug A 
Published: February 2015

Abstract
Starting from a two-particle equation of the exciton which includes beside the Coulomb inter-action a spin-dependent exchange term the influence of the electron and hole spin on the exciton spectrum is studied by taking into account spin-orbit and spin-spin interaction. A rough estimate of the resulting splitting is given. In a second part the effect of the spin-dependent exchange term in a magnetic field is investigated. The result is that the usual spin splitting for s-states can not be observed
Einfluß von Chlorsubstitution auf die El ektronenspektren von Biphenyl
Authors: Dreeskamp H. , Hutzinger O. , Zander M. 
Published: February 2015

Abstract
Absorption spectra in liquid solution, fluorescence and phosphorescence spectra, phosphores-cence quantum yields, phosphorescence to fluorescence quantum yield ratios, and phosphorescence decay times of 9 chloro substituted biphenyls dissolved in low temperature EPA glass were in-vestigated. The emission spectra of sterically unhindered systems are structured and significantly Stokes-shifted. Ortho substitution shifts the conjugation band in absorption as well as the un-structured fluorescence and phosphorescence bands to shorter wave lengths presumably by pre-venting the system from attaining a planar excited state. Chloro substitution which increases the rate constant of phosphorescence in the order meta < para < ortho, is nearly additive for multiple substituted systems and is correlated to the MO coefficients at the chloro substituted position in the absence of steric hindrance
Luminescence of Diatomic Molecules II. Energy Dependence of Collisional Deactivation Cross Sections
Authors: Comes F. J. , Speier F 
Published: February 2015

Abstract
Photoionization has been used to produce ions of N2, O2. and CO in definite excited states. Deactivating collisions of these ions with molecular gases were described in paper I, where the cross sections of ions with thermal velocity are given for various electronic and vibrational states. By application of an electric field the charged particles are accelerated yielding information on the influence of the kinetic energy of the collision partners on these deactivating collisions. The cross section is found to follow an exponential law σ ~ E-α, with a varying between 0.34 and 0 41 for the different excited stales of the molecular ions. The observations were carried out for a range of kinetic energies from the thermal energy up to 6 eV maximum. This simple exponential law is followed for kinetic energies up to at least 2 eV. At higher energies slight deviations were found to occur