bluuebunny/crossref_metadata_2025_split huggingface dataset:
Mass Renormalization and Chiral Symmetry Breaking in Nonlinear Spinor Theory
Authors: Bauhoff W. , Englert D. 
Published: February 2015

Abstract
The chiral invariance of conventional nonlinear spinor theory is assumed to be broken. This results in a finite mass renormalization of the nucleon mass. The self-consistency of the assumption is demonstrated. The meson mass eigenvalue equation is solved in lowest approximation. The spectrum which is no longer parity degenerate is in reasonable agreement with experiment.
53Cr Fourier Transform Nuclear Magnetic Resonance Studies
Authors: Epperlein B. W. , Krüger H. , Lutz O. , Nolle A. , Mayr W. 
Published: February 2015

Abstract
In various alkali chromate solutions in H2O and D2O the dependence of the Larmor frequency of 53Cr on the concentration of the solutions was measured by Fourier transform NMR and a large solvent isotope effect on the chemical shift of 53Cr was found. Further in potassium Chromate solutions the chemical shifts of 39K were observed and in a 2.2 molal solution of K2CrO4 in D2O a ratio of the Larmor frequencies of 53Cr and of 39K was measured with high accuracy. Using the concentration dependence of the Larmor frequencies of 53Cr and of 39K, an extrapolated ratio v(53Cr) /v (39K) extrapol. in infinitely diluted K2CrO4 in D2O is given. From this ratio a value of the magnetic moment of 53Cr in the Chromate ion is derived.
In chromium hexacarbonyl the 53Cr signal was observed and the chemical shift is given.
Microwave Spectrum and Barrier to Internal Rotation of 5-Methylisoxazole
Authors: Mjöberg P. J. , Ralowski W. M. , Ljunggren S. O. 
Published: February 2015

Abstract
The ground state rotational spectrum of 5-methylisoxazole has been studied in the region 18 000 -36 000 MHz. The A and E state transitions have been assigned.
The rotational constants are A = 9230.831 MHz, B = 3559.334 MHz and C = 2610.255 MHz and the three-fold barrier to internal rotation of the methyl group was calculated to be 777.2 ± 5.5 cal mol-1 .
Optische Spektren und Wanderungsmechanismen von Triplettexcitonen in reinen Naphthalinkristallen/Optical Spectra and Transport Mechanism of Triplet Excitons in Pure Naphthalene Crystals
Authors: Port H. , Wolf H. C. 
Published: February 2015

Abstract
Phosphorescence spectra of pure naphthalene and perdeutero-naphthalene crystals have been investigated between 4.2 and 300 K. Free-triplet exciton emission can be observed above 40 K only. The temperature dependence of phosphorescence line-width and line-shape has been studied between 60 and 300 K. With increasing temperature the lines are strongly broadened and become asymmetric. Above 150 K they show a red-shift (60 cm-1 at 300 K). The analysis is based on the decomposition of the lines into two components: an unshifted Lorentzian part resulting from coupled coherent and incoherent exciton motion and a sideband contribution built up with the phonon density of states of the naphthalene crystal. The Lorentzian line width is proportional to temperature. The degree of incoherence of exciton motion and characteristic parameters for the energy transfer mechanism are evaluated.
Dielektrische Relaxation von aliphatischen Kettenmolekülen mit endständigen Halogen-Gruppen in verdünnter Lösung / Dielectric Relaxation of α, ω-Halogen Alkanes in Dilute Solution
Authors: Klages G. , Straßmann M. 
Published: February 2015

Dielectric loss in the 0.3 to 140 GHz range, and to some extent dispersion, of seven selected aliphatic chain molecules, substituted by Cl, Br, and I at both ends have been measured in dilute solutions of n-heptane, benzene, and decalin. Chain length varied from 3 to 10 carbon atoms. For 1,10-dichlorodecane in decalin and mesitylene the temperature was also varied from -30 to + 60 °C. The unsymmetric absorption curves have been resolved in a weak FIR region and a predominant region with a symmetric relaxation time distribution (log. scale) according to Fröhlich. The width of this distribution is shown to be independent of chain length and halogen. Its mean relaxation time increases linearly with chain length, while the dipole moment goes through a minimum for the butyl compounds.
Monoderivatives, three chlorides and one bromide, have also been measured in the same solvents at 20 °C. Their absorption curves can be fitted by a predominant absorption region with the same width as for the corresponding di-derivatives and, besides the FIR wing, by another low frequency Debye-region, the weight of which decreases with increasing chain length. The molecular motions related to these three regions are discussed, and the corresponding magnitudes of dipole moments in mono- and di-derivatives are compared for long and short chains
Symmetrie-Gruppe eines geschlossenen Weltalls/ Symmetry Group of a closed Universe
Authors: Vollendorf F. 
Published: February 2015

Abstract
Symmetry Group of a closed Universe The fourteen degrees of freedom of a free falling and rotating body are described by means of a non-compact simple 14-parameter Lie group G14 . It is shown that this group can be interpreted as the symmetry group of a spherically closed space. Finally an outlook is made to the combination of an internal and an external symmetry group in a nontrivial way.
Electron Density Determination in an Are Plasma by Laser Interferometry
Authors: Brünger M. , Kock M. 
Published: February 2015

Abstract
By means of a 2 λ-Michelson-Interferometer the electron density has been determined with a mean accuracy of 2% in the axis of a wall-stabilized arc which has been operated in Argon at atmospheric pressure in a range from 10 to 100 A. The measurements have been performed with He-Ne-lasers at wavelengths λ1=0.63 μ and λ2 = 1.15 μ.
Functional Calculus of a Transferable Scalar in a Turbulent Flow
Authors: Ahmadi Goodarz 
Published: February 2015

Abstract
The problem of dispersion of a transferable scalar in a turbulent fluid is considered. The Hopf functional equation for the characteristic functional of the velocity vector and transferable scalar is derived and discussed. The special case of heat conduction with random initial condition is studied in detail. It is shown that the Hopf equation accepts a Gaussian characteristic functional solution and several examples are discussed.
Coupled Proton and Fluorine Nuclear Spin-Lattice Relaxation in Polycrystalline Magnesium and Zinc Fluorosilicate Hexahydrate
Authors: Jannek Horst-Dieter , Rager Helmut 
Published: February 2015

Abstract
Coupled proton and fluorine nuclear spin-lattice relaxation mechanisms have been studied in polycrystalline MeSiF6·6H2O (Me = Zn, Mg) at 30 MHz over the temperature range 130 K ≦ T ≦ 420 K. The results indicate that below 280 K in the magnesium complex and below 390 K in the zinc complex, respectively, the reorientations of the [SiF6]2- ions are the dominant relaxation mechanism. Reorientations of individual water molecules have not to be taken into account as an effective relaxation mechanism. The phase transition in MgSiF6·6H2O at 298 K is reflected by a change in the spin-lattice relaxation rate (T1)-1. In MgSiF6·6 H2O the relaxation behavior becomes purely exponential above the phase transition temperature, whereas in ZnSiF6·6H2O there is a non-exponential relaxation behavior over the whole temperature range investigated. The activation energies and frequency factors obtained from (T1)-1 measurements are consistent with the data obtained by use of the Waugh-Fedin relation.
Magnetische und Mößbauer-spektroskopische Untersuchungen von zeolithischen Eisenkontakten/ Magnetic and Mössbauer Spectroscopic Studies of Iron-Clusters in Zeolites
Authors: Schmidt F. , Gunsser W. , Knappwost A. 
Published: February 2015

Abstract
Iron clusters have been prepared within zeolite holes by reduction of zeolites containing ferrous ions. The diameter of these particles must therefore be smaller than 13 Å. They are super-paramagnetic and their Mössbauer spectra show no HFS, even at 4 K.
The temperature dependence of the magnetic susceptibility of the unreduced zeolites obeys a Curie-Weiss law with peff = 4,54 μB and Θ = 105 K. The Weiss curves of the reduced samples lie distinctly below those of the bulk material.
The Electrical Properties of Thin Films of TiNx and TiCx
Authors: De Maayer P. J. P. , Mackenzie J. D. 
Published: February 2015

Abstract
Thin films of metallically conductive titanium mononitride and carbide were prepared by means of electron beam evaporation. The composition of the samples could be changed over appreciable ranges by introducing nitrogen in the system or adding carbon to the pure starting material, respectively. The transport properties of the resulting compounds were studied as a function of nonstoichiometry and defect structure. A plausible explanation for the different behavior of the films compared to corresponding bulk samples is given and a correlation between the change in electron concentration and the electron transfer theory is presented.
Die Ringöffnungsreaktion des C3H3
+ -Ions/The Ring-opening Reaction of the C3H3
+-ion
Authors: Kebabcioglu R. , Dyczmons V. 
Published: February 2015

Abstract
The mechanism of the opening of the C3H3
+-ring was investigated by ab-initio SCF-calculations. In this ring-opening process the H-atoms move out of the CCC-plane. The reason for this is that for a CCC-angle of ≈ 90° a deformed π-system within the CCC-plane is formed. The reaction barrier is 83 kcal/Mol. The final result of the ring-opening is the linear propargyl cation.
Anwendung der Charakterordnungen zur Interpretation von Absorptionsspektren (N-Acylcarbazole)/ Application of Character Orders for the Interpretation of Absorption Spectra (N-Acyl-carbazoles)
Authors: Fratev Filip , Polansky Oskar E. , Zander Maximilian 
Published: February 2015

Abstract
Application For the first time character orders are applied to interprete absorption spectra: a high acetamid character order in N-acetylcarbazole explains the blue shift observed. The hypsochromic effect of acyl groups in such compounds is clarified. Also an explanation of the changes of CO stretch frequencies is given on the basis of character orders.
Kernresonanzuntersuchung der Molekülrotation und Selbstdiffusion in festem Benzol: T1ϱ-Spektroskopie/ Nuclear Magnetic Resonance Investigation of Molecular Rotation and Diffusion in Solid Benzene: T1ϱ-Spectroscopy
Authors: Noack F. , Weithase M. , Schütz J. von 
Published: February 2015

Abstract
We have extended previous NMR investigations of the molecular motion in solid benzene to lower proton spin Larmor frequencies using the rotating frame (T1ϱ) technique. The new data show two relaxation mechanisms, namely the well-known rotation of the benzene rings around their sixfold axis and, additionally, the self-diffusion by vacancies. The rotation and diffusion was analyzed by computer optimization of the relaxation models of Haeberlen and Torrey, respectively. The parameters of rotation are essentially consistent with results derived recently from high-frequency T1 measurements. The diffusion parameters are in agreement with preliminary low-frequency T1 measurements, but reveal a dramatic discrepancy by nearly 4 orders of magnitude with respect to tracer experiments of Fox and Sherwood. This behaviour is discussed in terms of correlation effects similar to those observed in plastic and liquid crystals.
Notizen: Sign Reversal of Thermo EMF on Hydrogen Diffusion in thin Nickel Foils
Authors: Nigam Amar Nath , Rani Ratna 
Published: February 2015

Abstract
On cathodic hydrogen diffusion thin foils of nickel (6 micron thickness) show a sign reversal in their thermo electric power. The original value -17 μV/ °C changes to + 3μV/°C after diffusion. The results are interpreted in terms of a possible 4p band filling by the electrons donated by hydrogen. Annealed foils retain hydrogen longer than the unannealed ones.
Notizen: Grünleuchtende Zentren im "kalt" aktivierten ZnS-Pb/Green Luminescent Centres in "Cold" Activated ZnS-Pb
Authors: Kynev K. , Dafinova R. 
Published: February 2015

Abstract
Green luminescent zinc sulphide activated with lead has been prepared by coprecipitation. A surface sensitivity of the emission spectrum is established and a participation of adsorbed ions in the luminescent centres located on the surface is assumed.
Notizen: Quantum Chemical Investigations on the Structure of the Gas Phase Ion Solvates M+(DMF-CH3
+)
Authors: Rode B. M. , Ahlrichs R. 
Published: February 2015

Abstract
The structure of the dimethylformamide fragment (DMF-CH3
+) and its complexes with Li+ and Na+ being observed in low pressure gas phase solvation has been investigated by means of ab initio SCF calculations with two different basis sets. Stabilization energies, charge transfer and polarization effects upon complex formation are discussed.
The Electric Conductivities and Densities of Molten SnCl2-ZnCl2 Binary Mixtures
Authors: Mentus S. V. , Šušić M. V. 
Published: February 2015

Abstract
The specific electric conductivities and densities of molten ZnCl2 -SnCl2 binary mixtures were measured as a function of composition in the temperature range 260 -530 °C. The electric con-ductivities show small, mainly negative, deviations from additivity. The densities show positive deviations from additivity, especially in the SnCl2-rich composition range. The structural properties of the melts causing such a behaviour are discussed.
Berechnung der freien Exzeßenergie und des osmotischen Koeffizienten zur Gewinnung von Potential-Parametern kurzreichender Wechselwirkungen bei Elektrolytlösungen
Authors: Schollmeyer Eckhard 
Published: February 2015

Abstract
Short-range interactions of Electrolyte Solutions Short range interaction potentials between ions are approximated by a step function with a hard core. Then from general statistical-mechanical formulas the first correction to the limiting law of the free excess energy F* (S(2) -term of the cluster theory) is computed for low concentrations, i.e. small plasm parameter μ=e2 x/D0 kT ⪡ -. Fitting to a Lennard-Jones potential for symmetrical electrolytes results in values for F*, the osmotic pressure and the osmotic coefficient. Numerical fitting to experimental results of Lange for the osmotic coefficient gives information concerning the contact distance a and attraction parameter E for some water-tetraalkylhalogenide-systems.
Miscibility Gaps in Fused Salts Note VIII. Mixtures Formed by LiF and two Alkali Bromides
Authors: Flor G. , Margheritis Ch. , Sinistri C. 
Published: February 2015

Abstract
Demixing phenomena were studied in 12 mixtures type LiF + (MeI, MeII)Br, MeI and MeII being alkali metals. Previous measurements of the LL equilibria in the system LiF + CsBr were extended to the high temperature field to evaluate the position of the point of maximum. Moreover, the data obtained on the system LiF + NaBr were analyzed in order to calculate the critical temperature of the "submerged" gap. The results allowed to test the thermodynamic theories concerning the reciprocal ternary systems in the case of large deviations from ideality.
Hyperschalleigenschaften von Wasser-Äthanolmischungen
Authors: Asenbaum A. , Sedlacek M. 
Published: February 2015

Abstract
In water-ethanol mixtures hypersound velocities and hypersound damping were measured at 10°, 20°, and 25 °C by Brillouin scattering. From the experimental data the relaxation frequency and the noerelaxing fraction of the bulk viscosity were calculated.
Multipole Polarizabilities from Hartree-Fock Densities by Statistical Perturbation Theory, a Semiempirical Approach
Authors: Witschel W. , Haars J. 
Published: February 2015

Abstract
A statistical variation-perturbation method is used in the derivation of multipole polarizabilities from Hartree-Fock electron densities. A quantum correction of the kinetic energy expressions takes into account the exponential decrease of the electron density in the outer part of the atom. The method is called semiempirical because of the still unsolved problem of the kinetic energy in the statistical theory of the atom. The results are compared to the best available experimental and theoretical values of dipole-and quadrupole-polarizabilities and show agreement within approxi-mately 10 - 15 percent. They are lower than Hartree-Fock perturbation results. As the numerical calculations are reduced to single integrations, the mathematical labor is considerably reduced. In an appendix dipole polarizabilities are calculated in the framework of the Gombas model including exchange and correlation for ionization degrees from zero to six.
Struktur von Schmelzen aus dem System Wismut-Antimon mittels Neutronenbeugung
Authors: Lamparter Peter , Steeb Siegfried , Knoll Walter 
Published: February 2015

Neutron diffraction work (λ = 0.695 Å) was done with molten Bi-Sb-alloys in the temperature range between 550 and 750 °C. Furthermore molten Bi was investigated at 300 °C. The interference functions show subsidiary maxima especially for alloys with higher Sb-concentrations. Evaluation yields, that the melts contain two different kinds of structure:
a) The one kind shows coordination number 9 and a statistical distribution of the atoms of two components. This kind is more inetal-like.
b) The other kind shows coordination number 3, consists of non-centered tetrahedra with smaller nearest neighbour distance. It shows covalent binding.
In molten Sb the nearest neighbour distance amounts up to 3.16 - 3.19 Å for theo ne kind and up to 2.64 -2.78 Å fort he other kind, which yields an mean distance of 2.99 Å, which was observed. The dependence of the concentration of the statistical kind of meld, of the (Sb)4-, and the (Bi)4-kind from the concentration of the whole melt is given.
By the model described the run of the measured mean coordination number and the mean distance versus concentration can be well explained.
Comments on Quartic Centrifugal Distortion Constants for Asymmetric Top Molecules
Authors: Yamada Koichi , Winnewisser Manfred 
Published: February 2015

Explicit relations between the spectroscopic constants, A͂ , B͂ , C͂, ⊿J,⊿JK, ⊿K, δJ,and δK,
obtained by the application of the various reduction procedures of the effective rotational Hamil­tonian are given in matrix formulation. Watson’s reduction procedures for the three different axis representations Ir, IIr, and IIIr have been considered as well as the reduction making R͂5 = 0, in­stead of R͂6 = 0.
The ambiguity in the determination of the τ’s arising from the use of planarity conditions is discussed in relation to the τ defect.
The Absorption Spectrum of Isotopic Diatomic Antimony ( 123Sb-123Sb). Analysis of the D ← X System in the 2860—2920 Å Region
Authors: Sibai Abdel Mooti , Topouzkhanian Ari , Perdigon Pierre 
Published: February 2015

Abstract
A rotational analysis of several bands of the D←X system of 123Sb−123Sb is carried out. It is shown that the hitherto assumed vibrational classification of the D←X system is certainly incorrect, as well as a previously given value for the rotational constant of the X state. B(X1∑g
+, ν=0) is found equal to 0.044263 cm-1. The perturbations appearing in the various vibrational levels are interpreted in terms of interactions with a new electronic state, labelled L.
Zum Verlauf der Gastemperatur in einer unipolaren Argon-HF-Entladung
Authors: Fischer Dieter 
Published: February 2015

Abstract
Temperature The temperature of the neutral gas (TGas) in an unipolar HF-discharge excited in argon at atmospheric pressure is measured by Mach-Zehnder-interferences. This value of the temperature can be compared with theoretical results concerning the relation between TGas, Trot and Te in dependence of the electron density Ne.
Electron Spectroscopic Studies of the Oxidation of Ni/Pd Alloys
Authors: Wandelt K. , Ertl G. 
Published: February 2015

Abstract
The oxidation of polycrystalline samples of Ni/Pd-alloys at 600 °C and 2·10-5 Torr O2 has been investigated by means of Auger electron spectroscopy and soft x-ray appearance potential spectroscopy. The clean surfaces are enriched by Pd; and with increasing Pd content the binding energy of the Ni 2p-core levels was found to decrease continuously by 0.7 eV. After completion of the oxidation identical overlayers were formed on all samples (except on pure Pd!) which were identified to consist of NiO. Within the depth probed by the applied techniques (≲20 Å) the rate of oxidation was found to increase with increasing Pd content, which is in contrast to the behaviour to be expected for the growth of thick oxide layers after the formation of a coherent NiO overlayer.
Sondheimer-und Durchbruch-Oszillationen in Aluminium / Sondheimer and Magnetic Breakdown Oscillations in AI
Authors: Papastaikoudis Constantin 
Published: February 2015

Abstract
The electrical resistivity of thin single crystal aluminium samples has been measured in a transverse magnetic field at 4.2 K. The magnetoresistance shows Sondheimer and mag-netic breakdown oscillations.
Dielektrische Relaxation und Elektronenspinrelaxation von Eisen(III)acetylacetonat in verdünnter Lösung/ Dielectric Relaxation and Electron Spin Relaxation of Ferric Acetylacetonate in Dilute Solutions
Authors: Dietz W. , Kilp H. , Noerpel W. , Straßmann M. , Stockhausen M. 
Published: February 2015

Abstract
The dielectric loss and electron spin resonance linewidth of ferric acetylacetonate have been measured in dilute solutions of benzene, m-and p-xylene, mesitylene and carbon tetrachloride. Permittivity measurements were made at 10 frequencies in the microwave region (1.2 m to 1 mm wave-length), ESR measurement at 2 frequencies (X and Q band). The permittivity results show a broad non-Debye pattern, yielding a mean correlation time of about 4 ps. The ESR results yield a mean correlation time of about 3 ps. The parallelism between the results obtained by both methods is discussed in view of a common relaxation process, which is the transient deformation of the chelate system resulting from stochastic induction by neighbouring solvent molecules.
A Molecular Dynamics Study of Aqueous Solutions
Authors: Vogel P. C. , Heinzinger K. 
Published: February 2015

Abstract
Results of a molecular dynamics study of a 0.55 molal aqueous NaCl solution are reported. The basic periodic box contained 200 water molecules, 2 sodium ions and 2 chloride ions. The calculated properties of this solution are compared with those obtained previously for a 2.2 molal NaCl solution. The formation of second hydration shells, an increase of the number of water molecules in the first hydration shells, and a release of internal pressure are the main changes connected with a decrease of the concentration.
The Role of the Oceans as a Sink for Chlorofluormethanes and similar Compounds
Authors: Junge C. 
Published: February 2015

Abstract
Model calculations show that the oceans do not represent a global sink for chlorofluoromethanes (CFM 11 and 12) of any significance. The amount absorbed by the oceans consists essentially of three portions: The portion dissolved in the mixing layer; the one that enters the deep sea and the portion which is decomposed or disappears otherwise within the mixing layer by chemical or biological processes. The calculations show that the total amount of CFM which may have entered the oceans up to the present time cannot have exceeded a few percent even if high destruction rates would occur in the oceans. Solubility data in ocean water in conjunction with concentration data in the oceans indicate, however, that the net destruction rate of CFM 11 in the oceans is only of the order of 10-7 sec-1 .
The Configuration of Organic Carbanions
Authors: Shanshal Muthana 
Published: February 2015

Abstract
The configurations of organic carbanions are studied using the MINDO/1 and MINDO/2 methods. It is found that the stability of the pyramidal configuration increases on going to small ring cyclic carbanions. Conjugation to an olefinic group decreases the inversion barriers of pyramidal carbanions but does not lead to their planarization. Conjugation to a nitro group, however, causes the planarization of the carbanions. It is found that the monosolvation of methylcarbanion increases its planarization energy.