bluuebunny/crossref_metadata_2025_split huggingface dataset:
Zur Verbreiterung der Wasserstoff-Linie Ly-a durch starke Elektronenstöße
Authors: Pfennig H. 
Published: February 2015

Abstract
A study of how strong electron collisions will influence the profile of the line core is made with­ in the framework of the impact theory. To this end the time-dependent Schrödinger-equation describing the change of state of the atom during the passage of one perturbing electron is solved numerically down to impact parameters equal to the de Broglie-wavelength 2 . In this range the classical description of the perturbing electrons is assumed to be still valid. In the dipole-only case the solution can be expressed exactly by elementary functions. The line profile clearly shows how important it is to consider the strong collisions. All the different ways of doing this lead to nearly the same results.
A Nonenergetic Theory of Heat
Authors: Job G. 
Published: February 2015

Abstract
The current interpretation of heat is completely different from the earlier concept which was quite successful at the beginning. Then, it was thought that heat was a quantity which could be neither created nor destroyed and that it was present in every material body. A body should become hotter by absorption of heat and expand, melt, vaporize or decompose, if the temperature necessary for these processes is reached1-5. On this basis, Black explained the existence of latent heats3, Carnot calculated the effective work of ideal heat engines4, Clapeyron found the connection between vapor pressure and heat of vaporization 6 and Thomsen developed the first material-independent definition of temperature 7. In spite of their success, these interpretations were in opposition to several experimental results showing that heat was obviously produced by consumption of work. These facts indicated a relationship between the two quantities.
Experimental Evidence of Fine Structure in Channeling Lines
Authors: Lutz H. O . , Ambros R. , Mayer-Böricke C. , Reichelt K. , Rogge M. 
Published: February 2015

Abstract
Fine structure was found in the angular distribution of 2 MeV He ions channeled between the (001) planes of 1600 to 3000 Å thick Au single crystals. In addition, the energy loss of the channeled particles was determined as a function of exit angle from the crystal.
Experimente zur elastischen Streuung von Kaliumatomen (2S1/2) an Jodatomen (2P3/2) in gekreuzten Molekularstrahlen
Authors: Hack W. , Rosenkranz F. , Wagner H. Gg. 
Published: February 2015

Der differentielle und totale Streuquerschnitt von 2S1/2 Kaliumatomen an 2P3/2 Jodatomen wurde in gekreuzten Molekularstrahlen bei thermischen Relativenergien gemessen. Im Bereich von Ablenkwinkeln δ < 2° wurden Maxima des differentiellen Streuquerschnittes gefunden, die sich über die klassische Regenbogenstreuung deuten lassen.
Messungen des totalen Streuquerschnittes bei Relativgeschwindigkeiten von 0,5 bis 1,8-105 cm/sec zeigen eine Abhängigkeit von der Geschwindigkeit, wie sie für die van der Waals Anziehung charakteristisch ist. Für höhere Relativgeschwindigkeiten wurden Abweichungen beobachtet, die sich dadurch deuten lassen, daß die Streuung am abstoßenden Teil der Wechselwirkungspotentiale den Verlauf des totalen Streuquerschnittes maßgeblich beeinflußt. Für die Potentialtöpfe der angeregten kovalenten Elektronenzustände des KJ ergibt sich mit dieser Deutung
εΩ= 1 ≈3,3 · 10-3 eV,
εΩ= 0+, 0-, 2 ≈ 2,5 · 10-3 eV.
εΩ= 0+, 0-, 2 ≈ 1,9 · 10-3 eV.
Force Field Study of Some Hexahalide Anions of Transition Metals
Authors: Avasthi M. N. , Mehta M. L . 
Published: February 2015

Abstract
Using the L matrix approximation method of Müller the seven independent force constants for the hexahalide anions of zirconium and hafnium metals have been evaluated employing general valence force field (GVFF). The stretching force constant increases as the oxidation number of the metal increases. The mean amplitudes of vibration have been calculated using the L matrix approximation method. The trends of mean amplitudes of vibration have also been discussed.
Normal Coordinate Analysis of Some Hexahalide Anions of IV Group Elements
Authors: Avasthi M. N. , Mehta M. L. 
Published: February 2015

Abstract
The normal coordinate analysis has been applied to the hexachloride and hexabromide of tin, titanium, zirconium and hafnium, using the Urey-Bradley force field (UBFF) and orbital valence force field (OVFF). It is observed that the stretching force constant increases as the oxidation number of the metal increases within isoelectronic series.
Barium Exhaust Spectrum during the Expansion of Combustion Products through a Nozzle into Vacuum
Authors: Batalli-Cosmovici Cristiano , Michel Karl-Wolfgang 
Published: February 2015

Abstract
The emission spectrum from a two-phase nozzle jet, consisting of combustion products of Ba and CuO, revealed that non-equilibrium amounts of excited and ionized Ba atoms occur only during the nozzle starting transient.
Traces of BaO-and Cu2-molecules could be identified in the cold outer parts of the jet. The particle temperature near the nozzle, derived from novel measurements of apparent color and brightness temperature, confirms LTE calculations if the vaporization of excess Ba is taken to be a fast process.
Durch Bestrahlung mit Röntgen-Licht bei LNT und Zimmertemperatur verfärbtes Ammoniumjodid
Authors: Podszus B. 
Published: February 2015

Abstract
FR-centers have been produced by x irradiation of ammonium iodide at liquid nitrogen temperature and have been studied by reflection-and luminecence-measurements. Pulse annealing experiments showed, that the J2~-centers were unstable above ~ 100 °K.
The 3,3 eV absorption band, first found by KAMIYOSHI5 , has been investigated by means of reflection measurements.
Die Wärmeleitfähigkeiten von reinem Ortho-und Para-Deuteriumgas und ihren Gemischen bei 18,4, 19,6 und 21,0 K / The Thermal Conductivities of Pure Ortho and Pure Para Deuterium Gas and Their Mixtures at 18.4, 19.6 and 21.0 K
Authors: Uebelhack W. , Eichenauer W. , Heinzinger K. , Klemm A. 
Published: February 2015

The results of measurements at three temperatures on gases in the whole concentration range from pure o-D2 to pure p-D2 are presented in the form (γp the molar fraction of p-D2)
X/X (rp=0) = 1 - ki yp-.k2 yp2,
with ^ = 2 . 1 7 , 2.43, 2.97 - l O " 3 and A:2=2.37, 2.27, 2.24 - l O " 3 for 7 = 18.4, 19.6, 21.0 K respectively. From these coefficients, and making use of the Eucken relation, the ratios of the collision cross sections have been estimated to be
Ωpp/Ωoo = 1 + (4.37 ± 0.05) • 10-3,
Ωop/Ωoo = 1 + (1-05 ± 0.05) • 1O-3.
A temperature dependence of these ratios was not detected
Die Konfiguration organischer Radikale
Authors: Shanshal Muthana 
Published: February 2015

Die Konfiguration am trivalenten Kohlenstoffatom (Radikalzentrum) organischer Radikale wurde anhand der MINDO/1-SCF-MO Methode und der 1/2 Elektron Approximation von DEWAR et al. studiert. Es zeigte sich in Ubereinstimmung mit den ESR-Untersuchungen, daß nicht alle Radikale eine planare Konfiguration besitzen. Die nichtplanare Konfiguration ist vor allem bei den cyclischen Radikalen mit kleineren, gespannten Ringen zu treffen. Beim Allyl-Radikal zeigte die Deformation des mittleren Protons eine Abhängigkeit vom C-C-C Valanz-Winkel.
Es wurde festgestellt, daß die MINDO/2 Methode keine genaue Aussage über diese Konfiguration erlaubt. Lediglich die Bindungsabstände mancher cyclischer Radikale (mit planearer Konfiguration) sind minimisiert worden. Bei den C5H5 und C3H3 Radikalen wird in Übereinstimmung mit früheren theoretischen Arbeiten eine Jahn-Teller Deformation zu Gunsten der weniger symmetrischen Struktur (Cs) festgestellt
Die physikalischen Grundlagen der Uran235 -Anreicherung nach dem Trenndüsenverfahren Die Wirkung des leichten Zusatzgases / Die Wirkung des leichten Zusatzgases
Authors: Becker E . W . 
Published: February 2015

Abstract
The Separation nozzle process for enrichment of U235 is based on the mass-dependent centrifugal force generated in a curved flow of a UF6/He or UF6/H2 mixture. It is shown that the experimentally determined separation effects can exceed those calculated for equilibrium separation in a stream flowing with an infinite velocity. A numerical analysis of the ternary diffusion process indicates that the separation of the UF6 isotopes is improved by the fact that the added light gas prevents the UF6 from concentrating rapidly at the boundary of the centrifugal field.
73 Ge Nuclear Magnetic Resonance Studies
Authors: Kaufmann J . , Sahm W. 
Published: February 2015

Abstract
The 73Ge spectra of some germanium-tetra-halides, germanium-tetra-alkyles, and of germanium-tetra-methoxide have been observed. The chemical shifts of these 73Ge NMR-lines were measured as functions of the temperature in the range up to 50 °C. In CS2-and benzene-solutions of Gel4 , two 73Ge-lines were found. The 73Ge NMR-spectrum of Ge(CH3)4 caused by indirect spin-spin-coupling between the 73Ge nucleus and the protons is well resolved. The spin-spin-coupling constants of Ge(CH3)4 and of Ge(OCH3)4, which shows an unresolved spectrum, were evaluated by an iterative least square fitting routine. The relaxation times T2 (in the range 30...740 msec) measured by the Carr-Purcell spin-echo-technique and calculated from the line widths are in good agreement. Precision measurements of the ratios of the Larmor frequencies of 73Ge in GeCl4, 41K in aqueous KF-solution and 2H in pure heavy water lead to a magnetic moment of 73Ge: μ = -(0.876 78 ± 0.000 01) μN (uncorrected).
Granulationsfreie Rekonstruktion von Hologrammen
Authors: Barlai P. 
Published: February 2015

Abstract
Described is a method for holographic reconstruction of diffusely illuminated objects which suppresses the known effect of granularity. The experimental setup is modest. It consists of a source of polychromatic light. Additionally there are inserted a simple ground glass and a diffraction grating in the reconstruction wave. Holographic reconstruction without granularity is achieved by incoherent superposition of longitudinal modes of the reconstruction wave.
Messung der Diffusion und des Isotopieeffektes von Silber in Blei
Authors: Herzig Chr. , Heumann Th. 
Published: February 2015

Abstract
Zur Klärung des Diffusionsmechanismus wurde die Diffusion und der Isotopieeffekt von Silber in Blei untersucht. Die gemessenen Diffusionskoeffizienten stimmen sehr gut mit den Werten anderer Autoren überein.
Der Isotopieeffekt von Ag105 und Ag111 in Blei wurde nach dem üblichen Schichtentrennungsverfahren bestimmt. Die Trennung der Impulsraten der beiden Isotope erfolgte einmal auf Grund ihrer unterschiedlichen Halbwertszeit und zum anderen auf Grund ihrer unterschiedlichen Zerfalls-eigenschaften (β-γ-Trennung).
Für den Isotopieeffekt wurde der Wert E ≌ 1 ermittelt. Dieses Ergebnis zeigt, daß die Diffusion von Ag in Pb im wesentlichen über Zwischengitterplätze abläuft.
Berechnung des Acetylenmoleküls
Authors: Egey Thomas 
Published: February 2015

Abstract
Es wird die Energie des Azetylenmoleküls im Grundzustand nach der VB-Methode berechnet. Die Elektronenfunktionen sind Slaterfunktionen mit Parametern, die sich aus Variationsansätzen für die Atome ergeben. Es werden nur homöopolare Zustände berücksichtigt. Betrachtet werden 3 1Σg
+- Zustände und deren Überlagerungszustand.
Zur Fein-und Hyperfeinstruktur von Lu I
Authors: Göbel L. H. 
Published: February 2015

Abstract
By means of the levelcrossing method the hyperfine structure constants and the lifetime as well as the angular momentum of the term 29607.98 cm-1 of LuI were determined. This term can be assigned to the 6s 27p 2P3/2-state. The signs of the interaction constants were obtained by the investigation of the line 3376.5 Å from this state into the 5d6s2
2D3/2 ground state in a Fabry-Perot interferometer. Together with the measured branching ratio from the lifetime the oscillator strengths were found. The results are:
J = 3/2;
B/| A | = 0.4947 (4); τ = 0.512 (16) · 10-8 (1.24/gJ) s;
A = 678.94 (2) gJ/1.24 MHz; f(3376.5 Å) = 0.382 (15);
B = 335.9 (3) gJ/1.24 MHz; f(3620.3 Å) = 0.15 (4) · 10-2.
Rotational and Vibrational Excitation of H2 by Slow Electron Impact
Authors: Linder F. , Schmidt H. 
Published: February 2015

Abstract
In a beam experiment the processes of elastic scattering, pure rotational excitation and deexcitation, pure vibrational excitation, and simultaneous rotational-vibrational excitation have been investigated for e-H2 scattering in the energy range from 0.3 eV to about 15 eV. Differential and integral cross sections have been determined in arbitrary units and calibrated on an absolute scale by normalization to absolute total cross sections. The results are discussed in terms of super-position of direct scattering, shape resonance and Feshbach resonance scattering and are compared with recent theoretical investigations. The cross sections for rotational and vibrational excitation, which are generally small for direct scattering, are greatly enhanced by a broad shape resonance near 3 eV and by Feshbach resonances around 12 eV. Characteristic differences in the excitation mechanisms are discussed.
Interaction of Randomly Phased Vibrational Waves via the Collision Dominated Solid State Plasma
Authors: Wonneberger W. 
Published: February 2015

Abstract
A diagrammatic technic is presented which is appropriate to study the nonlinear response of the collision dominated solid state plasma to randomly phased ac fields. By summation of diagrams, a nonlinear integral equation is established for the propagator S′ which is directly related to the nonlinear response function. Using the equation for S′, an equivalence is derived between a model solution in the theory of nonlinear coherent ultrasound amplification and the interaction theory of a great number of randomly phased vibrational modes, confined to a small frequency band.
Broadening of the Fine-Structure Raman Lines in Gaseous Oxygen
Authors: Hess S. , Knaap H. F. P. 
Published: February 2015

Abstract
Due to the coupling between the rotational angular momentum and the electronic spin, the depolarized Rayleigh light scattered from gaseous oxygen shows Stokes and anti-Stokes satellites shifted by about 60 GHz. The broadening of these fine-structure Raman lines is investigated theoretically for high and medium pressures where the linewidth is determined by two contributions, one proportional and the other inversely proportional to the pressure, p. The linewidth in the pressure broadening region is given by a relaxation frequency which is obtained from the Waldmann-Snider collision term. The p-1 contribution to the linewidth is determined by the ratio of the second moment of the fine-structure freqencies (with respect to the center of the shifted line) and another relaxation frequency. Both relaxation frequencies are sensitive to the nonspherical part of the inter-molecular potential.
Lokale Feldkorrekturen zum Elektron-Phonon-Matrixelement mit einer Anwendung auf den elektrischen Widerstand von Natrium im Bereich tiefer Temperaturen
Authors: Rauh A. , Bross H. 
Published: February 2015

Abstract
The electron-phonon-interaction is investigated within the RPA-scheme taking into account the local field of the crystal. In order to describe the screening by the conduction electrons an integral equation is solved in the limit of long phonon-wavelength. In contrast to the usual procedure, which is based on the deformation potential, the form factor of the ion potential and the electron wavefunction are needed in the present calculation. In the case of sodium the latter are calculated by the OPW method. Neglecting virtual interband transitions the T 5 -coefficient is found to be enlarged by 30% due to the local field. The result cannot explain the existing discrepancy of a factor 3 between experimental and theoretical resistivity.
Elastische und thermoelastische Konstanten des monoklinen Zinndifluorids
Authors: Acker E. , Recker K. , Haussühl S. , Siegert H. 
Published: February 2015

Abstract
All elastic and thermoelastic constants and the coefficients of thermal expansion of monoclinic SnF2 are measured. These properties deviate strongly from the behaviour of other difluorides such as CaF2 and MgF2. The high anisotropy, the large bulk compressibility and the departures from the Cauchy relations suggest the existence of strong covalent binding components between tin and fluorine atoms. The thermal properties are in accordance with Grünseisen's rule.
A Modified quasiparticle Model
Authors: Bolterauer H. 
Published: February 2015

Abstract
By use of the quasiparticle-quasihole space as model space, a model is established in order to determine excitation energies and transition probabilities of atomic nuclei. The equations derived show a remarkable correspondence to those in Migdal’s quasiparticle theory. The validity of the quasiparticle hypothesis, which is fundamental in Migdal’s theory, is not a necessary condition for a weak dependency of the effective interaction. This energy dependency is also independent of the choice of the one particle basis.
Representation of Symmetries and Observables in Functional Hilbert Space. II.
Authors: Rieckers A. 
Published: February 2015

Abstract
The representation of infinitesimal generators corresponding to the group representation dis-cussed in the preceding paper is analyzed in the Hilbert space of functionals over real test functions. Explicit expressions for these unbounded operators are constructed by means of the functio-nal derivative and by canonical operator pairs on dense domains. The behaviour under certain basis transformations is investigated, also for non-Hermitian generators. For the Hermitian ones a common, dense domain is set up where they are essentially selfadjoint. After having established a one-to-one correspondence between the real test function space and a complex Hilbert space the theory of quantum observables is applied to the functional version of a relativistic quantum field theory.
Bewegungen der CH3-Gruppen in Methyl-Naphthalin-Kristallen
Authors: Von Schütz J. U. , Wolf H. C. 
Published: February 2015

Abstract
The longitudinal proton relaxation time T1 in methyl naphthalene crystals, differing in the arrangement and number of the substituted CH3 groups, was measured as a function of the temperature above 77 °K and the magnetic field between 0.9 and 20 kOe. The results can be described by hindered rotation of the methyl groups with the jumping times and activation energies strongly dependent on the group arrangement. In the β-position the rotational barrier of 0.8 kcal/mol is predominantly determined by the infermolecular interaction, whereas in the case of the a-position and for adjacent CH3’s the hindering potential of 2.4 kcal/mol arises largely from the intramolecular term.
Simulation des Intensitätsverlaufs im Raman-Spektrum von Sauerstoff unter Berücksichtigung der Spinaufspaltung
Authors: Altmann K. , Strey G. , Hochenbleicher J. G. , Brandmüller J. 
Published: February 2015

Abstract
A high-resolution Raman spectrum of the oxygen molecule has been analysed taking into account the spin-splitting of its rotational levels, the contribution of 16O18O-isotope and N2-impurity. The intensity contour has been simulated by a computer program.
Vibration-Rotation Interaction in the HF Molecule
Authors: Topouzkhanian Ara H. , Topouzkhanian Ari S. 
Published: February 2015

Abstract
The wave functions, calculated by the method described in a preceding article, are used for the evaluation of the r-centroids relative to the 1 - 0 transition of the X 1Σ+ state. By means of experimental line intensities, it is shown that in the expansion of the electric dipole moment, the quadratic and higher terms are not negligible.
Ab-initio-Berechnung kleiner zweiatomiger Moleküle mit minimaler Basis
Authors: Ulmer W. 
Published: February 2015

Abstract
By means of Frost’s FSGO-method the systems Ne, Ne -Ne, Be -Be, and the molecules B2 as a single and triple bond, CO as a double and triple bond, N2 as a triple bond, and LiH have been calculated. The resulting energies are between 10% and 15% above the HF-limit, but the energy differences of the distinct bond representations are evidently sufficient to give an information about bond relations of a molecule. The type of bond is characterized, defining a “bond-strength”, by the position of the Gaussian orbitals.
On a Unified Theory of Harmonic Oscillator Two-Centre Integrals
Authors: Wltschel W 
Published: February 2015

Abstract
Occupation number representation and operator-technique are used in the calculation of harmonic oscillator matrixelements for one and two centres and for equal and different frequencies. The potentials treated are generalized Gauss-potentials of the form p̑k x̑l exp{a x̑2 }, x̑k p̑l exp{a p̑2 }, and p̑k x̑l exp{a x̑ p̑} which by application of an operator identity could be reduced to the same form. Applications in nuclear and molecular physics, in molecular spectroscopy and in quantum chemistry are discussed briefly.
Infrared Spectroscopy and Hydrogen Bonding: Complexing of y-Butyrolactone with o-Cresol
Authors: Nagarajan G. 
Published: February 2015

Abstract
Investigations to study the effect of different solvents on the frequency, intensity, and band width of the carbonyl band of y-butyrolactone were carried out on the basis of the mixed solvent techniques with carbon tetrachloride, being the inert solvent. The solvent used for such investigations is o-cresol. The results establish the existence of the 1 : 1 and 1 : 2 complexes at fairly low concentrations for the y-butyrolactone-o-cresol system. The formation constants for these complexes were determined and used to resolve the observed carbonyl bands into the spectra of individual complexes. The observed large frequency shift for the 1 : 2 complex favours a structure in which two molecules of o-cresol are directly bonded to the carbonyl group. The free energies of formation at 25 °C by using these formation constants show that the strength of the interaction increases in going from the 1 : 1 complex to the 1 :2 complex of the same y-butyrolactone-o-cresol system. These results have been discussed in relation to the frequency shift, intensity changes, and half width changes.
Struktur geschmolzener Magnesium—Cadmium-Legierungen / Structure of Molten Magnesium-Cadmium Alloys
Authors: Boos Alfred , Steeb Siegfried , Godel Dieter 
Published: February 2015

Abstract
Alloys from the system Mg - Cd were investigated in transmission by X-ray diffraction. From the intensity curves radial atomic distribution functions were obtained which allow to find the compound formation in the molten alloys of this system. The discussion of an additional intensity maximum yields the existence of the distance of 5.14 A between two Cd-atoms in the melts with 10 to 60 at.-% Cd. This distance is in agreement with a Cd - Cd-distance in the elementary cell of solid Mg3Cd. Thus the existence of agglomerates of the composition Mg3Cd2 in these melts is demonstrated.
It is pointed out that in this system (75 at.-% Mg-25 at.-% Cd) agglomerates exist in the melt which have the same atomic arrangement as the corresponding solid state although a temperature gap of more than 300 °C separates the existence region of the solid state and the solidus. The results are confirmed by mass-spectrometric investigations which show that also the vapour phase of Mg3Cd contains molecules of the composition Mg3Cd2 . The importance of mass-spectrometric information for the confirmation of structural investigations of melts and amorphous solids is shown.