bluuebunny/crossref_metadata_2025_split huggingface dataset:
Zur Rayleigh-Taylor-Instabilität eines rotierenden Wasserstofflichtbogens im axialen Magnetfeld
Authors: Döbele H. F. 
Published: February 2015

Abstract
The Rayleigh-Taylor instability of a rotating hydrogen arc in an axial magnetic field is investigated with allowance for electrical conduction, heat conduction and viscosity. The r-depending part of the perturbation was assumed to be in the form of a half-period of a standing wave. The corresponding dispersion relation is derived in the WKB-approximation and is solved numerically. In contrast with the case without dissipation, the frequencies and growth rates of the different modes depend on the parameters of the unperturbed plasma column. The calculation shows, in qualitative agreement with the experiment, that with increasing magnetic field the highest growth rate passes successively to the next higher mode.
Hydrogen Plasma Production by Giant Pulse Lasers
Authors: Mulser Peter 
Published: February 2015

Abstract
The problem of interaction of an intense laser beam with solid hydrogen is theoretically investigated in a one-dimensional plane geometry. The time dependent distributions of density, temperature and velocity of the produced plasma as well as those of the solid are found by numerical solution of the hydrodynamic equations for various laser powers. The maximum temperature can be approximately expressed in closed form as a function of the laser intensity and time. The calculations allow for the influence of thermal conduction and viscosity. At laser intensities above 1.8 x 1011 W/cm2 the plasma frequency rises above that of the laser in the transition sheath between the hot plasma and the cold solid. The problem of absorption and reflection of laser radiation in this region is investigated.
Die Dampfdruckkurve von In2S3
Authors: Bollmann G. , Nelkowski H. 
Published: February 2015

Abstract
The temperature dependence of the In2S3 vapour pressure was investigated by means of the effusion method using radioactive In-116. In the range from 900 - 1200 K the pressure is given by log p = - 1.118 · 104/T + 9.23.
Kinetic and Potential Energy Partitioning for Antibonding Molecular Orbitals
Authors: Schmidtke Hans-Herbert 
Published: February 2015

Abstract
Expectation values of kinetic and potential energy are calculated for some lower antibonding orbital states of simple diatomic molecules using H2
+ and HeH2+ as test cases. Common LCAO-MO theory and a scaling procedure are applied which allow an analysis of atomic orbital interactions in terms of RUEDENBERG'S1 promotion and interference effect at various internuclear distances. Contributions to the total energy at different regions of interatomic separations are discussed in detail. A characteristic increase of the kinetic energy is observed for antibonding linear combinations at distances where chemical bonding occurs.
Molecular Force Fields of Some Selenium and Telurium Hexahalide Ions
Authors: Avasthi M. N. , Mehta M. L. 
Published: February 2015

Abstract
Wilson's GF matrix method has been used to evaluate all the seven independent force constants of some XY6 type ions using Müller's mathematical constraint. Mean amplitudes of vibration and Bastiansen-Morino shrinkages have also been calculated for these ions.
Lumineszenz von γ-bestrahltem Silicagel bei Sorption von Gasen: “Radiosorptionslumineszenz”
Authors: Rabe J. G. , Breitkreutz K. 
Published: February 2015

Abstract
Luminescence has been observed on exposure of γ-irradiated silicagel to various gases and vapours. The emission spectrum has a maximum at 450 nm and is identical with the spectrum of radiothermoluminescence (RTL) under vacuum with a peak at 55 °C. After radiosorption luminescence (RSL) at 20 °C the thermoluminescence at 55 °C is decreased. The effect of RSL shows that sorbed gases can cause recombination of charges trapped in the gel.
Elektronen-Spin-Resonanz und optische Untersuchungen an Cr-dotierten Y-Ti-Pyrochlor-Einkristallen Y2Ti2O7
Authors: Becker Wolf-Jürgen 
Published: February 2015

Single crystals of Y2Ti2O7, which crystallizes with the pyrochlore-structure, have been grown by the flux method with PbO -PbF2. The cubic lattice constant is a = (10.0896 ± 0.0014) Å. The free O II-parameter x= -0.0788 ± 0.0005 was determined from X-ray and neutron diffraction data.
The ESR spectrum of Cr-doped Y2Ti2O7 single crystals has been observed at X- and Q-band. Cr3+ occupies Ti4+-sites (Symmetry D3d). We obtained the following parameters of the spin Hamiltonian
g∥ = 1.9743 ± 0.0005, g⊥ = 1.9767 ± 0.0008 , |D| = 0.954 ± 0.007cm-1.
The optical absorption spectrum of Cr3+-doped Y-Ti-pyrochlore shows the U-band (4A2 → 4F2) at (19200 ± 100) cm-1. The R-lines have been studied with fluorescence methods:
R1-line E(2E) → 4A2 at (13 930 ± 1 ) cm-1; R2-line 2A(2E) → 4A2 at (14 002 ± 1) cm-1 . The splitting of 72 cm-1 indicates a relatively large trigonal component of the crystal field.
Ternary Lanthanide Complexes of the Type M(Hsal)3(TPX → O)2 and a Fluorescence Spectral Study of the Eu(III) Analogue
Authors: Sinha Shyama P. 
Published: February 2015

Ternary lanthanide complexes of the general formula M(Hsal)3 (TPX→O)2 , where M = lanthanide (III) ion, Hsal=salicylate ion =C6H4(OH)COO- and X = P or As have been isolated as solids from the benzene phase during liquid-liquid extraction studies of M(Hsal)3 complexes with benzene solutions of TPX→O. The coordinated nature of the TPX→O ligands has been established from the observed shifts of the X → O frequency in the infrared. A lowering of the 1190 cm-1 P → O frequency where X = P , and an increase in the 885 cm-1 As → O frequency where X = As have been observed for the ternary complexes. The infrared spectra of the ternary complexes in general indicate the coordinated nature of the salicylate ions.
The luminescence spectra of Eu(Hsal)3 (TPPO)2 and Eu(Hsal)3 (TPAsO)2 complexes have also been investigated at 77 °K. Beside the emission of the characteristic red europium fluorescence due to the excitation of the complexes with near UV light, emission of a blue molecular phosphorescence from the complexes has also been observed. The fluorescence intensities of the f → f transitions are, however, weak. This point has been discussed.
Functional Quantum Theory of Scattering Processes. II
Authors: Stumpf H. 
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 S'-matrix. In this paper the functional S'-matrix is constructed for relativistic spin 1/2 fermion scattering in nonlinear spinortheory with noncanonical relativistic Heisenberg quantization. With appropriate modifications the procedure runs on the same pattern as in the case of nonrelativistic potential scattering treated in I. Furthermore a calculational method for scattering functionals is proposed. In the appendices technical details are discussed.
Bestimmung der Molekülstruktur des Dimethylsulfonimins mit Hilfe der Elektronenbeugung an Gasen
Authors: Oberhammer Heinz , Zeil Werner 
Published: February 2015

Abstract
Mit Hilfe der Elektronenbeugung wurde die Molekülstruktur des Dimethylsulfonimins in der Gasphase bestimmt. Die folgenden geometrischen Molekülparameter wurden gefunden:
S - O = 1,437 ± 0,003 Å, S-N = 1,521± 0,003 Å, S-C = 1,781 ± 0,003 Å,
C - Hm = 1,083 ± 0,007 Å, N - Hi = 1,022 ± 0,018 Å,
∢ CSC = 101,6 ± 1,3°, ∢ OSN = 132,6 ± 0,9°, ∢ CSO = 106,7 ± 1,0°,
∢ CSN = 102,7 ± 1,3°, ∢ SNHi = 114,1 ± 2,4°, ∢ HmCHm = 108,8 ± 1,3°
(Hm = Methylwasserstoff, Hi = Iminwasserstoff).
Die Ergebnisse werden mit den entsprechenden Werten der isoelektronischen Verbindungen Dimethylsulfodiimin und Dimethylsulfon verglichen. Es wird versucht, die Bindungsverhältnisse in diesen drei Molekülen mit einem stark vereinfachten Modell zu beschreiben.
Molecular Diamagnetism: Uncoupled Calculations for Two Center Systems
Authors: Ludwig B. M. , Voitländer J. 
Published: February 2015

Abstract
For Σ1 molecules constructed from first row elements of the Periodic Table computations of the diamagnetic susceptibility and the nuclear magnetic shielding constants are reported. The method used is a gauge invariant approximation to the gauge dependent “uncoupled” perturbation theory in the Hartree-Fock scheme; the groundstate description considered is provided by the best limited MO functions.
Some emphysis is placed on methodological aspects and the role of π-electrons in this context; acceptable overall agreement with experiment is achieved, especially for the mean diamagnetic susceptibility. The phenomenon of antishielding occurring for fluorine and nitrogen nuclei is shown to depend critically upon the nodal structure of the state. A similar behaviour of the induced current density is not predicted by the semiclassical Thomas-Fermi theory, for which results are obtained too. This theory fails for principle reasons to explain the linear magnetic response of nonspherical systems.
Thermoelectric Properties in Silver Chloride-Alkali Chloride Fused Mixtures
Authors: Sinistri Cesare , Pezzati Elisabetta 
Published: February 2015

Abstract
The initial thermoelectric power of the molten salt mixtures (Ag + Me)Cl (Me = Li, Na, Rb, Cs) has been measured at various temperatures around 800 °C using a silver electrode thermocell. In addition the thermoelectric power of molten pure AgCl is reported.
These data have been used to obtain relative values of the heats of transport of the alkali cations in pure salts. Moreover the global behaviour of these mixtures in respect to an ideal model for the heat and electricity transport is discussed.
Microwave Absorption Spectra of AlF, GaF, InF, and TIF
Authors: Hoeft J. , Lovas F. J. , Tiemann E. , Törring T. 
Published: February 2015

Observation of various rotational transitions of four Group Ilia monofluoride allowed the Dunham coefficients Y01, Y11, Y21 and Y12 to be determined. From the hyperfine structure of the AlF, GaF and InF spectra, the nuclear electric quadrupole coupling constants, e qv Q, and spin-rotation coupling constant, CI, were obtained for several vibrational states, v:
e qv Q(27 Al19F) = -37,75(8) + 0,44(8) (v + 1/2) MHz,
e qv Q(69 Ga19F) = -107,07(8) + 1,09(7) (v + 1/2) MHz,
e qv Q(71 Ga19F) = -67,46(8) + 0,68(7) (v + 1/2) MHz,
e qv Q(115 In19F) = -727,06(20) + 6,64(20) (v + 1/2) MHz.
Stark effect measurements on GaF and InF in the ground vibrational state resulted in the following electric dipole moments:

69Ga 19F: |μ̄| = 2,45 (5) D,

115In 19F: |μ̄| = 3,40 (7) D
Nuclear Dipolar Relaxation in Pure Solids
Authors: Haeberlen U. 
Published: February 2015

Abstract
Relaxation of the nuclear dipolar energy <HD> is considered. The static part of HD sets up an energy reservoir, and its dynamic part is taken as the predominant cause for the spinlattice relaxation. This situation may be realized in nature in such pure solids in which molecular reorientations are frequent. Relaxation steps in which the total nuclear spin quantum number does not change are treated in detail. They are found to involve always three nuclear spins. The theory is applied to solid benzene in which the molecules are assumed to reorient about their 6fold symmetry axis. Both intra- and intermolecular interactions need to be taken into account. The theoretical results obtained are in close agreement with recent measurements of van Steenwinkel.
Impurity Diffusion in Lithium
Authors: Ott Aadu 
Published: February 2015

Abstract
The diffusion of 115mCd, 203Hg and 72Ga tracers in lithium metal has been studied, using a thin film deposition and sectioning method.
The experimental results can be expressed by the following Arrhenius relations:

These results, which do not agree with any established theory of impurity diffusion in a metallic lattice, are discussed together with data from previous experiments in terms of the systematics of the dependence of the diffusivity on the "ionizability" of an impurity atom in Li, and on the size of the impurity. In this way a qualitative explanation of the different diffusions rates can be obtained. The relatively large and electropositive impurities appear to diffuse mainly via a vacancy mechanism and the small and electronegative ones mainly as interstitials. The distinction substitutional-interstitial is less pronounced for very large impurities, which may also exhibit tendencies to be trapped at lattice defects.
Notizen: Ternary systems of potassium thiocyanate, formate and halides
Authors: Cingolani A. , Gambugiati M. A. , Berchiesi G. 
Published: February 2015

Abstract
By employing a visual method, solid-liquid equilibria were studied for various mixtures in order to draw maps of ternary systems formed with potassium thiocyanate, formate and halides. Within the accessible portion of each system, three crystallization regions and one ternary eutectic were identified. Areas of crystallization regions are considered in their relation to the radius of the halogen ions.
Gleichzeitige Bestimmung von Elektronenkonzentration und Elektronenstoßzahl in einem örtlich langsam veränderlichen Magnetoplasma
Authors: Muschler W. 
Published: February 2015

Abstract
A previous paper 1 is continued and a wave propagation experiment is treated, which seems suitable for simultaneous determination of electron concentration and electron collision frequency in a plasma permeated by a stationary magnetic field. Electron concentration and electron collision frequency are parameters of the Appleton-Hartree-formula, which describes the complex refractive index of the medium penetrated by the wave. On the other hand the refractive index can be ex-pressed by the complex ratio of the electric and magnetic wave components, if the W.K.B, solutions of coupled wave equations are used. These are valid for a (locally) slowly varying medium. - The complex wave polarisation is another characteristic of the magnetoplasma. It is also defined by simple field strength relations and presents itself for application in the experiment. When both refractive index and wave polarisation are determined by amplitude and phase measurements, electron concentration and electron collision frequency can easily be deduced from the complete Appleton-Hartree-formula.
Frequenzmodulation und Kompression ultrakurzer Lichtimpulse
Authors: Laubereau A. , Von Der Linde D. 
Published: February 2015

Abstract
Expressions are given for the phase modulation by the optical Kerr effect and the resulting frequency broadening of an optical pulse with elliptical polarization. The compression method is discussed for a quantitative comparison with experimental investigations. Starting with single pulses of 20 ps duration and 0.4 cm -1 frequency width, generated by a mode-locked laser and an optical switching device, the phase modulation in an external cell containing CS2 produced a frequency broadening of 5 cm-1 typically. A compression factor of 5 is achieved in a system consisting of one optical grating and a reflection prism. Satisfactory agreement between theory and experiment is obtained for the frequency modulation Δω) and the compression length l. Our data suggest that the time dependence of our input pulses is symmetric with wings of higher power than those of a Gaussian pulse.
Vollständige rs -und r0 -Struktur, 14N-Kernquadrupol-HFS und Dipolmoment von Methylthiocyanat aus dem Mikrowellenspektrum
Authors: Dreizler H. , Rudolph H.D. , Schleser H. 
Published: February 2015

Abstract
The microwave rotational spectra of five isotopic species of the molecule methyl thiocyanate, CH3SCN, have been observed in the region between 7 and 33 GHz. From the rotational constants of these and two other species whose spectra were previously known a complete rs-structure of the molecule could be determined which is compared with several r0-structures obtained subject to certain assumptions. The dipole moment components μa and μb could be determined inclusive of relative sign. The 14N quadrupole coupling tensor, complete with the only non-vanishing non-diagonal element χab, could be evaluated from the HFS of the lines and its change upon isotopic substitution.
Simplified Model for Ionization and Recombination in a Hydrogenic Plasma with Resonance Radiation Trapping
Authors: Mewe R. 
Published: February 2015

Abstract
The rate coefficients for electron collisional-radiative ionization and recombination have been calculated on the basis of a simplified level scheme for hydrogenic ions in a homogeneous and fully contained plasma with self-absorption for (Doppler broadened) Lyman a radiation. The energy distribution of the electrons is assumed to be Maxwellian. Photoionization is neglected. The cal-culation have been done for a range of electron temperature of Z2 to 10 Z2 eV and electron density of 1014 Z7 to 1024 Z7 m-3 , where Z is the charge number of the bare nucleus.
Self-Focusing of Laser Light and Stimulated Scattering Processes in Transparent and Absorbing Liquids: 1. Self-Focusing
Authors: Maier M. , Rahn O. , Wendl G. 
Published: February 2015

Abstract
The spatial and temporal development of self-focusing of light pulses is investigated. The beam diameter in CS2 and molten para-di-chlorobenzene decreases with increasing incident laser power to small values in good agreement with theory. The strong influence of beam divergence, non-linearity of refractive index, and absorption on self-focusing action is found to agree well with numerical calculations. It is shown that both backward stimulated Brillouin and Raman scattering terminate the self-focusing process.
Quantenmechanik und Objektivierbarkeit/ Quantum Mechanics and Objective Reality
Authors: Baumann K. 
Published: February 2015

Abstract
Quantum Mechanics and Objective Reality A Schrödinger function (or a density matrix) can he ascribed only to an object whose isolation time is larger than its time of revolution. This condition can never be satisfied for macroscopic bodies. Consequently, the "cut" between object and observer must not separate a macroscopic body (measuring apparatus) from the rest of the universe. Hence in an analysis of the measuring process, the state vector of the universe must be introduced. An interpretation of this state vector is given which provides an objective description of nature.
Chemically Induced Dynamic Nuclear Polarization
Authors: Lehnig M. , Fischer H. 
Published: February 2015

Abstract
Alkyl radicals are generated by reactions of phenyl radicals in binary mixtures of substituted alkanes. CIDNP-NMR spectra of their reaction products are explained by S - T0-transitions in radical pairs formed in free radical encounters. From comparisons of calculated and observed CIDNP spectra the (g-factor and the proton hyperfine coupling constant of · CHCl2 are determined [g = 2.0080 ± 0.0003, a = (- 17.0 ± 1.0) G]. The inclusion of nuclear relaxation in free radicals in quantitative CIDNP treatments is discussed, and evidence for the radical pair mechanism causing CIDNP of phenyl derivatives during dibenzoylperoxide decompositions is presented.
Lack of Evidence for Shell Effects in the (n,p) and (n,α) Reaction Cross Sections at 14 MeV Neutron Energy
Authors: Qaim S.M. 
Published: February 2015

Abstract
The systematics of cross sections for (n,p) and (n,a) re-actions induced by 14 - 15 MeV neutrons have been reinvesti-gated. No clear evidence for the existence of any proton shell effects in these two reactions was found.
The existence of shell effects in nuclear reactions induced by 14 - 15 MeV neutrons has been postulated by several workers1-4 , but the evidence presented has been rather weak. With the availability of more and better experimental data in recent years, a fresh look at this postulate seemed highly desirable. In case of (n,p) and (n,2n) reactions, the claim for the occurence of shell effects has already been recently repudiated5,6 ; but for (n,α) reactions there seems to exist no evidence against the original claims1,2 that the cross section shows a minimum when the atomic number of the re-sidual nucleus is a magic number. The present article describes briefly a reinvestigation of the systematics of the (n,p) and (n,α) reaction cross sections in the light of the latest experimental data. At 14 MeV neutron energy there appears to be no conclusive evidence for any significant proton shell effects in these two re-actions.
Messung des transversalen Relaxationsverhaltens in Mehrlinienspektren der kernmagnetischen Resonanz
Authors: Stempfle W. , Hoffmann E.G. 
Published: February 2015

Abstract
Es wird eine Methode zur gleichzeitigen Bestimmung des transversalen Spin-Relaxationsverhaltens mehrerer, möglicherweise sogar aller Linien eines NMR-Viellinienspektrums angegeben. Der eine Meiboom-Gill-Impulsfolge begleitende Spin-Echo-Interferenzzug wird einer Fourier-Transformation unterzogen, und zur Gewinnung der Echofolge der einzelnen NMR-Signale werden mehrere partielle Rücktransformationen durchgeführt.
Kinetic Theory for Mixtures of Dilute Gases of Linear Rotating Molecules in an External Magnetic Field (Formal Theory)
Authors: Raum H.H. , Köhler W.E. 
Published: February 2015

Abstract
A transport theory is developed for mixtures of dilute gases consisting of linear rotating diamagnetic molecules in an external homogeneous magnetic field. This formalism is adequate for a treatment of the Senftleben-Beenakker effects for gas mixtures. Starting point is the system of linearized Waldmann-Snider equations. A complete scheme of orthogonal expansion tensors in velocity and rotational angular momentum is given, up to tensors of third rank and power. The moment method is applied to solve the coupled system of Waldmann-Snider equations and the resulting system of transport relaxation equations (TRE) is stated up to third rank tensor equations. The local conservation laws - linearized in the deviation from thermal equilibrium - are derivated from the TRE.
Zusammenstellung der Koeffizienten für die Anpassung komplexer Streufaktoren für schnelle Elektronen durch Polynome
Authors: Haase Oachim 
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 6 - 92 zu berechnen.
Ein Iterationsverfahren zur Berechnung von Kraftkonstanten aus Grundschwingungsfrequenzen
Authors: Hüttner W. 
Published: February 2015

Abstract
A method for the adjustment of force constants from vibrational frequencies is presented. It re-presents an alternative to the various types of least-squares procedures which are widely used in force constant calculations, and avoids some of the well-known divergence difficulties which may occur in such least-squares iterations. Solving a system of normal equations is replaced by two simpler operations which cannot become ill-conditioned by singularities. The method applies preferably to cases where the number of excess data is small or zero.
Berechnung von mittleren Schwingungsamplituden nach der Methode der charakteristischen Schwingungen von Müller
Authors: Baran Enrique J. 
Published: February 2015

Abstract
It is shown for many molecules and ions that the "Methode der charakteristischen Schwingungen" of Müller is usefull for the calculation of mean amplitudes of vibrations if the vibrations are rather characteristic.
Radiation-Induced Conformation Changes of the Pyrimidine Ring in a Single Crystal of Dihydrothymine
Authors: Herak J. N. 
Published: February 2015

Abstract
Radiation-induced radicals in a single crystal of dihydrothymine were studied with EPR. It was found that the 5-thymyl radical is the dominant radical species at room temperature. The orientation dependence of the hyperfine couplings can only by explained if one assumes that C(5), C(6) and C(7) lie in the plane defined by the rest of the nonhydrogen atoms of the ring. The highly dis-ordered structure of the ring in the undamaged crystal is ordered if a proton bound to C(5) is removed.