bluuebunny/crossref_metadata_2025 huggingface dataset:
Zur Verbreiterung von Heliumlinien und der Wasserstofflinie Hβ durch Stark-Effekt der Mikrofelder
Authors: Kusch Hans Jürgen
Published: February 2015

Stark broadening of the neutral helium lines λ 5015 Å and λ 3889 Å was compared with the width of Hß in a quasi-stationary plasma produced in helium-hydrogen mixtures of various composition. Electron densities derived from the broadening of Hß differ from those determined from helium line profiles by a factor about 1.7. The electron densities varied from 0.8 -5 • 1016 cm-3 in the Hß-scale; the temperatures in the range 18 000 -26 000 °K were found from helium-line measurements and from the underlying continuum. Special care was taken for the time-constancy of the plasma emission and for demixing effects
Mass Fractionation and the Isotopic Anomalies of Xenon and Krypton in Ordinary Chondrites
Authors: Hennecke E. W. , Manuel O. K.
Published: February 2015

The abundance and isotopic composition of all noble gases are reported in the Wellman chondrite, and the abundance and isotopic composition of xenon and krypton are reported in the gases released by stepwise heating of the Tell and Scurry chondrites. Major changes in the isotopic composition of Xe result from radiogenic Xe129 and from variations in the isotopic mass fractionation pattern in the different temperature fractions. The isotopic composition of trapped krypton in the different temperature fractions of the Tell and Scurry chondrites displays smaller fractional changes than xenon, but the isotopic composition of these two gases covary in the manner expected from mass dependent fractionation
Levels of the Odd Mass Isotopes of Sb and I and the Unified Model
Authors: Goldstein I. V. , De Pinho A. G.
Published: February 2015

A description of the low-lying positive parity levels of the odd mass isotopes of Sb and I is presented on the basis of the intermediate coupling approach of the unified model. Such analysis helps to understand many properties of those levels since a rather satisfactory agreement with experimental data is reached
The Spectral Response of PbS Films
Authors: Büger P. A. , Malan O. G. , Kunze O. A.
Published: February 2015

Two possible ways are reported of influencing the spectral response of PbS films prepared by chemical deposition. An increase in the ratio of hydroxyl to lead ions in the deposition solution causes a shift of the peak spectral response from 1.3 μ to 2.8 μ. The addition of a reducing agent (hydroxyl amine hydrochloride) also markedly influences the spectral response. The time constant, resistance and thickness of the films have been measured and an attempt is made to explain all the observations on the basis of a modified conduction model
Luminescence of Diatomic Molecular Ions
Authors: Comes F. J. , Speier F.
Published: February 2015

The ionic species N2
+ B, CO+ A, CO+ B, and O2
+ b have been produced by irradiation with the He I resonance line. Franck-Condon-factors both for excitation and deexcitation have been deduced from the fluorescence of the molecular ions. Most of them agree with calculated values of the Franck-Condon-factors. Measurements at different pressures ranging from 0.005 to 5 Torr lead to the deactivation cross sections for collisions with the parent molecule. N2
+B also is deactivated in collisions with O2. Cross sections vary between 50 Å2 and 250 Å2 depending upon the ionic species and its vibrational quantum number. The deexcitation is described as a radiationless transition where electronic energy is transfered into vibrational energy
Die Beeinflussung der optischen Absorption von Molekülen durch ein elektrisches Feld
Authors: Liptay W. , Walz G. , Baumann Wolfram , Schlosser H.-J. , Deckers H. , Detzer N.
Published: February 2015

The effect of an external electric field on the optical absorption of molecules in solution allows certain components of the polarizability tensors in the ground state and in excited electronic states to be determined. Electrooptical absorption measurements were performed on some aromatic hydrocarbons (anthracene, tetracene, perylene, bianthryl) and some tetraphenylpolyenes at different temperatures and in different solvents. For the aromatic hydrocarbons, the polarizabilities in the first excited singlet state were found to be 20 to 70 p.c. greater than those in the ground state. The increases are either mainly parallel or mainly perpendicular to the direction of the transition moment of the absorption bands. For the tetraphenylpolyenes, the measurements yielded much greater increases of up to 400 p.c. almost totally in the directions of the transition moments, which are approximately in the directions of the chains. Fluctuation effects of the local electric field were observed, they may be interpreted using the extended model 9
Spektroskopische Untersuchungen an Komplexverbindungen *
Authors: Keller H. J. , Nöthe D. , Rupp H. H.
Published: February 2015

The existence of an one-dimensional metallic state in crystallized transition metal complexes with a columnar crystal structure can be identified by their linearly polarized metal-like reflection. Compounds of this type do not show a macroscopically detectable metallic conductivity
Ein neues Bandensystem als Chemilumineszenz in einer Molybdäncarbonyl-Wasserstoffatomflamme
Authors: Becker Karl H. , Schürgers Maria
Published: February 2015

Durch Reaktionen von Metallcarbonylen mit Sauerstoff-, Stickstoff- und Wasserstoffatomen in der Gasphase bei Totaldrucken von einigen Torr werden elektronisch angeregte Produkte gebildet, die ein charakteristisches Spektrum emittieren
A Modified quasiparticle Model
Authors: Bolterauer H.
Published: February 2015

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

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

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

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.
Ein Verfahren zur Computer-Simulation der Rotationsstruktur von Raman-Banden
Authors: Altmann K. , Strey G.
Published: February 2015

A computer program for simulation of the rotational structure of Raman bands is described. The program is used for an analysis of the Raman spectra of gaseous chlorine.
Vibration-Rotation Interaction in the HF Molecule
Authors: Topouzkhanian Ara H. , Topouzkhanian Ari S.
Published: February 2015

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

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

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

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

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.
Dissociation Lifetimes of Molecular Ions Produced by Charge Exchange
Authors: Andlauer B. , Ottinger Ch.
Published: February 2015

Ions of the benzonitrile, benzene and thiophene molecules were produced in well-defined states of excitation by charge exchange with Xe+, Kr+, Ar+, CO+, and N2
+. Their subsequent unimolecular decomposition was followed, as a function of time, by allowing the dissociations to take place within a strong homogeneous draw-out field and measuring the kinetic energy of the product ions. The decompositions were found to be purely exponential within experimental error, and the corresponding decay rate constants k (for 2 · 105 sec-1 ≦ k ≦ 5 · 108 sec-1) proved to be monotonically increasing functions of the excitation energy. These are the first unambiguous measurements of this function k(E) for any molecule. In the case of benzene, the reactions C6H6
+ → C6H5
+ + H and C6H8
+ → C4H4
+ + C2H2 were found to be definitely not in competition with one another. Furthermore the dependence of the excitation energy on the impact energy was measured. A variation of the impact energy between 10 and 200 eVc.m. only changes the internal energy E by about 0.1 eV. This value appears to be in qualitative agreement with calculations on near-resonant charge transfer by Gurnee and Magee.
Dynamical Interaction of Electron Waves in a Perfect Single Crystal
Authors: Lehmpfuhl G
Published: February 2015

Electron diffraction from a perfect single crystal shows the influence of many-beam interaction. Investigations with a single crystal wedge allow a direct analysis of the Bloch-waves which are dis-played into their partial waves. The strength of the dynamical interactions in a MgO crystal wedge was investigated by comparing the photographic record of a section through the dispersion surface with many-beam calculations. For a direction of the incident beam near the [110] zone axis the interaction of at least 50 beams has to be taken into account. Using a 50-beam calculation the structure potential V111 was determined to 1.80 volts ±3%.

The influence of many-beam interactions on the absorption and the extinction fringe profiles in electron micrographs is discussed. Analysis of extinction fringes on the basis of a 50-beam approximation allowed the determination of the mean absorbing potential V0
im of MgO to 0.7 volts ±10%.
Der Einfluß des Entladungsgefäßes auf die Bestimmung der Plasmaelektronendichte mit Hohlraumresonatoren / The Influence of the Discharge Tube on the Determination of the Plasma Electron Density by Means of Cavity Resonators
Authors: Janzen G
Published: February 2015

The eigenvalue equation of a plasma-discharge tube configuration in a cylindrical microwave cavity is derived and solved numerically by an exact theory for TMlm0 , TM0mn, and TE0mn resonance modes. The radial and axial electron density profiles are assumed to be homogeneous.

The factors of proportionality between electron density and shift of the resonance frequency derived from the linear perturbation theory are compared with the exactly computed eigenvalues. Hence the range of validity of the linearly computed factors of proportionality (geometry factors) can be established.

By considering the influence of the discharge tube the geometry factors are altered and consequently the sensitivity of the measurement. The influence of the discharge tube can be taken into account by means of suitable correction factors.
Quasi-Equilibrium Theory of Ionic Fragmentation: Further Considerations
Authors: Klots Cornelius E.
Published: February 2015

A recent reformulation of quasi-equilibrium theory is extended to several additional classes of ionic decompositions. Formulae for calculating average translational and rotational energies of the fragments are presented, and kinematic corrections to the formulas are introduced. Illustrative calculations are compared with experiment, and the interesting possibility of maxima in rate constants is noted.
Level-Crossing-Experimente am bewegten Leuchten / Level-Crossing Experiments on High Velocity Atoms
Authors: Bachmann W. , Janke W.
Published: February 2015

Durch Stoßwechselwirkung zwischen einem Helium-Ion und einem Neon-Atom findet unter ande-rem ein Elektroneneinfang in einen angeregten, teilweise ausgerichteten Heliumzustand statt. Es wurde die Breite des durch Elektroneneinfang angeregten 41D-Heliumzustands in Abhängigkeit vom Fremdgasdruck des Neon und in Abhängigkeit von der Geschwindigkeit der Heliumatome mit Hilfe des Hanle-Effekts gemessen. Daraus wurde die Geschwindigkeitsabhängigkeit der Wirkungs-querschnitte σD
(2)(ν) zur Zerstörung der Ausrichtung der angeregten Heliumatome infolge von Stößen mit Neonatomen bestimmt. Im Energiebereich von 5 keV bis 30 keV war das Produkt ν · σD
(2)(ν) konstant, d.h. ν · σD
(2)(ν) proportional ν-1 .

Als zusätzliches Ergebnis erhielten wir die natürliche Lebensdauer des 41D-Zustandes zu (38,4 ± 2,1) nsec.
A Simple and Reliable Dye Laser System for Spectroscopic Investigations
Authors: Kühl J. , Marowksy G. , Kunstmann P. , Schmidt W.
Published: February 2015

Efficient spectral narrowing and accurately reproducible tuning of a dye laser has been achieved by the combination of a low-loss narrow-band interference filter and a solid-quartz-plate-Fabry-Perot-etalon. Bandwidths as small as 5-10-3 Å were obtained by this simple system increasing the spectral density by a factor of at least 2 · 103.
Photolyse des Äthylens im Bereich 147 — 193 nm / Ethylene Photolysis At 147 — 193
Authors: Potzinger P. , Glasgow L. , Bünau G.
Published: February 2015

Ethylene photolysis was investigated at 147, 163, 185 and 193 nm. The following three primary processes were observed at all wavelengths

C2H4 + hν → C2H2 + H2, (1)

C2H4 + hν → C2H2 + 2H, (2)

C2H4 + hν → C2H3 + H. (3)

(1) was independent of all experimental parameters tested: temperature, pressure, wavelength, scavenger, and light intensity. (2) decreases with increasing pressure and increases with increasing photon energy. (3) shows almost no pressure dependence at 185 nm and decreases in importance with increasing photon energy. A kinetic analysis shows that participation of at least three different states of ethylene must be invoked to explain the results. A tentative correlation of these states with the spectroscopic states of ethylene is given.
Quantenchemische und spektroskopische Untersuchungen an Porphyrinen. III. Die Chlorine / Quantum Chemical and Spectroscopical Studies on Porphyrins. III. The Chlorins
Authors: Knop J.V. , Stichtenoth H.
Published: February 2015

Zur Deutung der Elektronenanregungsspektren von Chlorin, Ni-Chlorin e6 , des Chlorin-Dianions und Chlorin-Dikations wurden Pariser-Parr-Pople-Berechnungen mit Berücksichtigung von 90 ein-fach angeregten Konfigurationen durchgeführt.

Neben neuen Gesichtspunkten zur Zuordnung der Elektronenübergänge im Absorptionsspektrum konnten auch experimentelle Voraussagen hinsichtlich der Ladungsverteilung im Molekülgerüst bestätigt werden.
Zur Begrenzung der radial en Ausdehnung des Li chtbogenstromes durch ein axiales Magnetfeld. II. Skalengesetze und Vergleich mit Experimenten / On Limitation of the Radial Extent of the Arc Current by Means of an Axial Magnetic Field. II. Scaling Laws and Comparison with Experimental Results
Authors: Klüber O.
Published: February 2015

In an arc with superimposed axial magnetic field, radial current components cause a rotational motion of the plasma column and produce azimuthal Hall currents and hence electromotive forces such that the arc current is guided by the magnetic field lines. In the first part of this paper the steady-state plasma equations have been solved for a homogeneous plasma in simple geometry, allowance being made for finite viscosity. Here, scaling laws giving the radial extent of the arc current are obtained. In addition, electrodes with finite cross sections are treated. The results of model calculations agree well with experimental data. Generally, the model is applicable, if the angular frequency of the plasma is small compared with the ion gyration frequency.
Molecular Force Fields of Tungsten and Uranium Hexachlorides
Authors: Avasthi M.N. , Mehta M.L.
Published: February 2015

Molecular force field studies of tungsten and uranium hexa-chloride have been carried out using the Urey-Bradley force field (UBFF) and the orbital valence force field (OVFF). Weighted least square adjustment has been used to fit the observed frequencies. Comments are also made on the suit-ability of the force fields used. The trends in stretching force constants have been discussed.
Time Correlation Functions for Gases of Linear Molecules in a Magnetic Field
Authors: Pierre A. G. St. , Köhler W. E. , Hess S.
Published: February 2015

Time correlation functions for gases of linear molecules in a static homogeneous magnetic field are derived from the set of transport relaxation equations obtained from the linearized Waldmann-Snider equation. In particular, the complex auto-and cross correlation functions of the friction pressure tensor and the tensor polarization are considered. They are of importance for the viscosity, the depolarized Rayleigh spectrum, and flow birefringence. For the gases HD and CO2 their real and imaginary parts are plotted as functions of a reduced time and discussed. Lastly, the influence of a constant magnetic field on the flow birefringence property of a gas of linear molecules in a Couette flow arrangement is treated. The principal axes of the dielectric tensor are rotated about the field direction. For two field orientations the respective angles of rotation are determined. The eigenvalues of the dielectric tensor reveal the tendency of the optical and transport properties of the gas to decouple for increasing field strengths
Frequenzverschiebungen durch CD3 -Substitution in den Schwingungsspektren von Trimethylchlorsilan, Hexamethyldisiloxan und Trimethoxysilan und ihre Verwendung zur Kraftkonstantenberechnung
Authors: Höfler Friedrich
Published: February 2015

Die Untersuchung der IR-und Raman-Spektren von (CD3)3SiCl und (CD3)3SiOSi (CD3)3 führt zu einer Neuzuordnung der ρCH3-Schwingungen in Trimethylsilylverbindungen. In Normalkoordina-tenanalysen an diesen Verbindungen sowie an HSi (OCH3)3/HSi (OCD3)3, die sich auf die gemes-senen Isotopenverschiebungen stützen, wird das Schwingungsverhalten der Methylgruppen durch die Einbeziehung von ρCH3 (CD3)-Koordinaten angemessener wiedergegeben als durch eine Betrachtung als Punktmassen. Für die vornehmlich interessierenden Valenzkraftkonstanten ergeben sich folgende verbesserte Werte: f(SiCl) 2,84; f(SiO) 4,60 (Hexamethyldisiloxan) bzw. 5,13 mdyn/Å (Tri-methoxysilan) und f(SiC) 2,84-2,89 mdyn/Å
Genäherte natürliche Orbitale für die Grundzustände von Li und Li-; Elektronenaffinität von Li- / Approximate natural orbitals for the groundstates of li and li-; electron-affinity of li-
Authors: Grün Norbert
Published: February 2015

Starting from a set of Slater-type atomic orbitals with seven s-, four p-, one d- and one f-type functions the total wavefunction is constructed by a C I-calculation. The highest degree of the secular equation is 84 for Li (2S) and 142 for Li- (1S). By diagonalizing the first-order density matrices approximate natural orbitals are obtained. These are analysed and used again in a further C I-calculation. The best values for the electron-affinity are 0.572 eV and 0.614 eV. For the latter value only the correlaton energy of the L-shell of Li- is considered
Der Einfluß der Restwechselwirkung VPN auf das Rotationsspektrum des u-u-Kerns 166Ho / The influence of the residual interaction fpu on the rotational spectrum of the odd-odd nucleus 166ho
Authors: Reinecke M , Ruder H , Volz H
Published: February 2015

Starting with a model for odd-odd nuclei, which had been used in former investigation (rigid, symmetrical top for the deformed even-even core, two extra particles in a Nilsson potential), the influence of the coupling term Hc and of the residual interaction VPN on the rotational spectrum of the odd-odd nucleus 166Ho are discussed. It is shown, that in this nucleus neither the coupling term Hc nor a pure Wigner force can explain the characteristic features of the rotational spectrum. It is therefore necessary to introduce a residual interaction VPN, which contains at least a spin-spin term. The explicit calculation for the nucleus 166Ho with a simple ansatz (δ-interaction with spin-spin term) already leads to a qualitative explanation of the particularities in the observed rotational spectrum. The investigations show a way how to get more information about the protonneutron interaction in odd-odd nuclei
On the Exchange Part of the Single-Particle Spin-Orbit Potential Following from the Nucleon-Nucleon Spin-Orbit Interaction
Authors: Penzel R , Stocker W
Published: February 2015

The exchange part of the single-particle spin-orbit potential following from a two-body spin-orbit potential is calculated. Scheerbaum's approximation of setting the exchange part equal to the direct part is investigated
On the Foundation of Quantal Proposition Systems
Authors: Ochs Wilhelm
Published: February 2015

We investigate the arguments recently given by Jauch and Piron that quantal proposition systems form a complete atomic lattice. Our analysis shows that the reasoning of these authors can not establish the intended result.
Amplituden für kohärente Neutronen-Streuung gemessen an chemischen Verbindungen / Coherent Neutron Scattering Amplitudes Obtained from Chemical Compounds
Authors: Koester L. , Knopf K.
Published: February 2015

Coherent Neutron Scattering Amplitudes Obtained from Chemical Compounds Utilizing the small angle scattering of slow neutrons by Christiansen-filters we could determine with a good accuracy the scattering amplitudes of powders by comparing with wellknown liquids. Investigations on powders of halides and sulfates yielded coherent scattering amplitudes of the bound atoms (in 10-13 cm) :

a (Na) = 3.63 ±0.02; a(K) =3.71 ±0.02;

a (Rb) =7.08 ± 0.02; a (Cs) = 5.42 ± 0.02;

a(Tl) =8.89 ±0.02; a (Br) =6.77 ±0.02;

and a (I) =5.28 ±0.02.

The scattering amplitudes of the liquids and the elements as standards are based on directly determined amplitudes from gravity-mirror measurements.
Zur Theorie der Jordan-Nachwirkung / Theory of Thermally Activated Relaxation in Ferromagnets
Authors: Hahn Artur
Published: February 2015

Theory of Thermally Activated Relaxation in Ferromagnets The theory of the thermally activated relaxation process in a ferromagnet, leading to the phenomenon of Jordan-type aftereffect, is reinvestigated. The analysis is based on a more general statistical approach than the concept of a macroscopic free energy as a function of a macroscopic state variable usually employed in this field. Within the simplest possible model analytical results are obtained, leading to a re-establishment of the usual concept for small systems and its break-down for systems larger than a critical size. For large systems asymptotic results are obtained differing qualitatively from those of the conventional scheme. The most important result is a temperature-independent viscosity coefficient 5V , defined by Eq. (3) of the text.
A Phenomenological Study of the Steady-State Current Sheet Speed in a Magnetically Driven Shock Tube
Authors: Chang C. T.
Published: February 2015

The discrepancy between the measured steady-state speed of the current sheet and the theoretically predicted value is examined through a detailed analytical and experimental study of the basic assumptions used in the model. It is found phenomenologicaly that the observed deviation at dis-charge conditions of low voltage and high pressure could be attributed mainly to the spreading of the current-carrying region in time. The deviation occurring at discharge conditions of high voltage and low pressure could be attributed to the possible presence of an ion drag caused by the interaction between the plasma and the electrode surface.
Zur Geschwindigkeit der Ausrichtung nematischer Flüssigkeiten durch Magnetfelder / Kinetics Of Alignment Of A Nematic Liquid Crystal In Magnetic Fields /
Authors: Heppke G. , Schneider F.
Published: February 2015

The rotation of the molecules in a nematic liquid crystal is studied after rotating the axis of the aligning magnetic field. The process of realignment is observed by doping the liquid crystal with an electrolyte and measuring the cross voltage U* which is induced perpendicular to the applied electric field. The resulting cross voltages are compared with the stationary values and it can be shown that the degree of order with respect to the rotating director remains almost constant. Therefore, the time dependence of the angle 0 between director and magnetic field can be calculated from the measured cross voltage using the steady state equation U* = U*(Φ) . Φ(t) satisfies the formula

ln | tan Φ | = ln | tan Φ0 | - (χa H2/γ1) t

which is derived from the differential equation for the rotation of the

director. This formula allows the calculation of the viscosity coefficient γ1, giving a value of 1.08 P for MBBA at 25 °C. An activation energy of 11.5 kcal mol -1 is determined from the temperature dependence of the viscosity coefficient.
Über eine Methode zur Bestimmung der Dissoziationsrelaxationszeiten in Kr—Cl2-Gemischen / About A Method To Determine Dissociation Relaxation Times In Kr-Cl2-Mixtures
Authors: Pletsch G.
Published: February 2015

Streak photographs from the emission of shock tube heated Kr-Cl2-mixtures show two regions in the reflected wave with different front velocities and different temperatures. The region near the end plate of the shock tube is assigned to the dissociation relaxation zone of the incident shock, the following to the equilibrium zone. The relaxation times are determined from these photographs in combination with the data of the incident shock.
Einfache lokalisierte Orbitale für die Moleküle CH4, NH3 und H2O / Simple Localized Orbitals For The Molecules CH4, NH3 und H2O
Authors: Krell J. , Zuhrt Ch. , Zülicke L.
Published: February 2015

Results of ab-initio bond-orbital calculations for the molecules CH4, NH3 and H2O are reported. The orthonormal localized orbitals for inner shells, lone pairs and bonds are compared with the corresponding localized SCF orbitals and discussed with respect to their dependence upon the basis functions and the hybridization as well as to their transferability. According to present experience, application of the bond-orbital approach in the theoretical determination of conformational energies is particularly promising.
Hyperfeinstruktur von CsJ / Hyperfine Structure of CsI
Authors: Hoeft J. , Tiemann E. , Törring T.
Published: February 2015

The quadrupole hyperfine structure of 133Cs127I was measured on the rotational transition J = 2 → 3 at 4.2 GHz. The obtained quadrupole coupling constants of 127I in various vibrational states are reported.
Eine SCF-MO-CI-Berechnung des C2 -Moleküls mit einer atomaren Basis von kontrahierten Gauß-Funktionen / An scf-mo-cl calculation of the c2 molecule using an atomic basis of contracted gaussian lobe functions
Authors: Barsuhn J
Published: February 2015

The C2-molecule seems to be a very useful object for the purpose of comparing different quantum chemical calculations because of the extensive experimental data available for this molecule. In the present treatment a basis set consisting of 25 primitive Gaussian lobe functions which have been contracted into 4 s-groups and 2X3 p-groups has been used. SCF orbitals obtained for the ground state configuration 1 πu
4 have been employed in two CI-calculations at R-values in the vicinity of the equilibrium internuclear distance. The calculation involving only virtual a-orbitals agrees qualitatively with the experimental data for the three known Rydberg states. The most extensive Cl-treatment employed overestimates the excitation energies to the higher states by up to 1.7 eV; the relationship between the theoretically calculated transition energies and the corresponding experimental values is approximately linear, however. The results are compared with previous extensive CI-calculations of FOUGERE and NESBET who used two different 2-zeta Slater basis sets
Abschätzung von Zustandsdichten des Silbers in a-Silber-Mischkristallen mit Gallium, Indium, Germanium und Zinn auf Grund thermodynamischer Untersuchungen mittels galvanischer Festkörperzellen / An estimation of densities of state of silver in a-solid solutions of silver with gallium, indium, germanium and tin based on thermodynamic investigations by means of solid state galvanic cells
Authors: Predel B , Schallner U
Published: February 2015

The partial free enthalpies of formation of the binary a-solid solutions of silver with gallium, indium, germanium and tin were determined at 1000 °K from the EMF of suitable solid state galvanic cells. A further evaluation of the results taking into account known enthalpies of for­mation yielded the complete partial and integral excess functions of these solid solutions. An analysis of the difference of the excess values of the partial free enthalpies of formation of the components showed that the lattice distortion, due to differences in atomic radii of the solid solutions studied, is not very significant. Differences in the structure between the solid solution and its components can be clearly noted only in the case of the silver-germanium solid solutions. The energetics of the alloys are determined principally by the filling of the 5s1 conduction band of the silver by the electrons contributed by higher-valent constituents. From the thermodynamic results the density of state of the conduction band of the silver was estimated to be smaller than 0.31 electr. per atom and eV. The density of state increases with increasing concentration of the alloying component; this can be explained by a change in the Fermi surface in the silver host lattice
Mikrowellenspektrum, Rotationskonstanten, Zentrifugalverzerrungskonstanten und Kernquadrupolkopplungskonstanten des CD3SiH2Cl. Über Bindungseigenschaften in Silicium-Halogeniden: 1. Mitteilung / Microwave spectrum, rotational constants, centrifugaldistortion constants and nuclear quadrupole coupling constants of CD3SiH2Cl
Authors: Zeil Werner , Gegenheimer Richard , Pferrer Saskia , Dakkouri Marwan
Published: February 2015

Microwave The microwave spectra of the following isotopic species of methylchloro-silane CD3
28SiH2
35Cl, CD3
29SiH2
35Cl, CD3
30SiH2
35Cl, CD3
28SiH2
37Cl have been measured and analyzed. The rotational constants, centrifugaldistortion constants and nuclear quadrupole coupling constants have been determined. The Si-Cl-distance is 2.049 Å respectively 2.052 Å as calculated by the rs method. The corresponding angles between the siliconchlorine-bond and the inertia-axis a are Θ = 26°53' respectively 26°49'
Zeeman-Effekt im Rotationsspektrum von Perdeuterodimethylsulfid / Rotational zeeman-effect of perdeuterodimethylsulfid
Authors: Hamer E. , Sutter D. H. , Dreizler H.
Published: February 2015

The rotational Zeeman effect of (CH3)2S and (CD3)2S has been observed under high resolution. Earlier measurements of BENSON and FLYGARE 2 on (CH3)2S were supplemented by the recording of two additional transitions. A line shape analysis was used to evaluate the data which led to the determination of the diagonal elements of the g-tensor and of the susceptibility anisotropies [in 10-6 erg/(G2 mole)] :

From the change of the g-values upon deuteration it was possible to determine the sign of the electric dipole moment (negative end at the sulfur atom)
On the Existence of Antiferromagnetism in Hubbard's Approach to the Hubbard Model
Authors: Jelitto Rainer
Published: February 2015

We investigate the possibility of selfconsistent solutions for antiferromagnetism in the Hubbard model in the decoupling of the Greens functions introduced by Hubbard in his first paper. On the base of this approximation Arai has calculated the band splitting for antiferromagnetism, but, as will be shown in this paper, Hubbard's approach fails to yield antiferromagnetism for nearest neighbour hopping in the same way as it does not yield ferromagnetism, and no selfconsistent solutions of the problem beyond the well known paramagnetic solution do exist.
Stromverteilung und Materiemitführung bei der Hohlpincherzeugung mit kondensierten Stickstoff-Molekularstrahlen / Current Distribution and Mass Pickup during a Hollow Dynamic Pinch Discharge in Condensed Molecular Beams of Nitrogen
Authors: Becker E. W. , Klingelhöfer R. , Wüst J.
Published: February 2015

The current distribution during a z-pinch discharge in a hollow cylindrical beam of nitrogen clusters is determined by magnetic probe measurements. After breakdown a current sheath arises within the ring-shaped cross section of the cluster beam. During the discharge the sheath is accelerated radially inward towards the axis. Simultaneously the radial collapse of a hollow luminosity pattern is observed by image converter photographs. The arrival of the current sheath at the axis coincides with the rapid development of a luminous core in the photographs. The radius-time curve of the sheath is calculated with the measured density of the electrodynamic forces neglecting pressure terms. Comparison of the observed and the calculated radius-time curves seems to indicate that most of the injected mass of the cluster beam is swept inward by the pinch discharge.
Experimentelle Bestimmung innerer und äußerer Parameter des negativen Glimmlichtplasmas einer zylindrischen Hohlkathodenentladung in Argon / Plasma Diagnostic Measurements in the Negative Glow of a Cylindrical Hollow Cathode Discharge
Authors: Howorka F. , Pähl M.
Published: February 2015

The negative glow plasma of a cylindrical hollow cathode dc discharge (0.05 - 1 Torr Argon, 1-30 mA) is investigated as to the position of the glow edge, the axial dependence of the cathode current density, the axial and radial potential distributions, the density and energy of electrons (from Langmuir probe measurements) as dependent on pressure, discharge current and position, etc. It is found that two groups of electrons exist whose energies are < 0.5 eV ~ 3 eV and the ratio of their denisties being 3 up to 20. A phenomenological explanation is given for the relatively high denisty of the fast group, The results are compared with those of other auhors concerning hollow-cathode and linear discharges.
Medium-Sized Gaussian Lobe Bases for Use in Molecular SCF-MO-Calculations
Authors: Ady E. , Brickmann J.
Published: February 2015

Medium sized basis sets of Gaussian Lobe functions for use in SCF-MO calculations are presented. With these, computations are performed on the hydrides of the atoms Li -F. Partly, mixed bases are applied in which the one-electron integrals are calculated with respect to a more extensive basis than the two-electron integrals. The energy shifts caused by shortening of the bases are separated into several components which are discussed in detail. Some conditions are given for that cases in which mixed basis calculations yield better results for energy and virial coefficient than uniform ones. These conditions are fulfilled by the function sets proposed.
Notizen:Gain Measurements in a Nitrogen Laser Amplifier
Authors: Basting D. , Steyer B.
Published: February 2015

An oscillator amplifier nitrogen laser arrangement has been built. A small signal gain up to 340 dB/m was measured. Furthermore, image amplification of 170 times was demonstrated.
Notizen:13C-NMR Chemical Shift Anisotropy of Acetylene
Authors: Englert Gerhard
Published: February 2015

The 13C-NMR spectrum at 22.63 MHz and the PMR spectrum at 90 MHz of 13C enriched acetylene oriented in a nematic liquid crystal were measured by the pulsed Fourier technique and analysed. From the chemical shift difference between the nematic and the isotropic phase the anisotropy of the 13C shielding tensor of acetylene Δσ=+253 + 17 ppm was calculated.
The Dipole Moment Function of H79Br Molecule
Authors: Urquhart D. N. , Clark T. D. , Rao B. S.
Published: February 2015

The radial Schrödinger wave equation with Morse potential function is solved for H79Br molecule. The resulting vibration-rotation eigenfunctions are then used to compute the matrix elements of (r-re)n . These are combined with the experimental values of the electric dipole matrix elements to calculate the dipole moment coefficients, M1 and M2 .
Generalized Wave Energy Expressions in Strongly Dispersive Media in Terms of Bilinear Concomitants
Authors: Anderson D.
Published: February 2015

The standard expressions for averaged energy density and energy flow of waves in dispersive media are generalized in order to include effects due to strong dispersion and/or broad band signals. A close relationship is revealed between these generalized energy expressions and the bilinear concomitants corresponding to the dispersion operator, which governs the wave motion.
EPR of Mn2+ in CdGa2S4 and in CdGa2Se4 ; Influence of Covalent Bonding on the Parameters of the Spin-Hamiltonian
Authors: Schlaak M. , Weiss Alarich
Published: February 2015

The EPR-spectra of Mn2+ in CdGa2X4 (X = S, Se) single crystals were measured and described by a Spin-Hamiltonian with an axial and with a cubic crystal field component:

D=-(225.3±0.2)·10-4 cm-1 and a= (6.6 ± 0.2)·10-4 cm-1 for CdGa2S4;

D=-(919.3±0.3)·10-4 cm-1 and a= (15 ± 2)·10-4 cm-1 for CdGa2Se4.

The g-values g∥ = 2.0012 ± 0.0005, g⊥ = 2.0016 ± 0.0010 for CdGa2S4 and g∥ = 2.0029 ± 0.0005, g⊥=2.0039 + 0.0010 for CdGa2Se4 are slightly different from those of the binary chalcogenides CdX (X = S, Se).

The hyperfine constants A, - (64.0 ± 0.3)·10-4 cm-1 for CdGa2S4 and - (60.7 ±0.3)·10-4 cm-1 for CdGa2Se4 are nearly the same as those of the equivalent binary cadmium chalcogenides. It is shown that all parameters of the cadmium chalcogenides are characterized by the covalent part of the bonding. The g-values can be explained by an interaction of the 3d orbitals of Mn2+ with the ligand orbitals. The hyperfine constant is caused by an interaction of the excited 4s-Mn2+ states with the ligand states. By optical absorption measurements the value of the band gap in CdGa2X4 (X = S, Se, Te) is determined.
Transporteigenschaften von Bi70Sb30 / Transport Proper ties of Bi70Sb30
Authors: Schneider G. , Trinks R.
Published: February 2015

Crystals of the composition Bi70Sb30 , undoped and doped with the donor Te and the acceptor Sn, were made by zone melting. Specimens were prepared with the long edges parallel to the bisectrix, the binary or the trigonal axis. Transport properties (electrical resistance, transverse magneto-resistance, Hall effect, thermoelectric power, longitudinal and transverse Nernst-Ettingshausen effect) were measured for specimens with different orientation and doping in the temperature range from 8 to 300 °K. Investigations of magnetic field dependence of some properties and of the anisotropy of magnetoresistance in a transverse field of different directions were made.
Notizen: Hydrogen Scrambling in 1-Naphthol under Electron Impact
Authors: Klasinc L. , Güsten H.
Published: February 2015

The fragmentation of 1-naphthol and the scrambling of the hydroxyl group hydrogen under electron impact has been studied by means of deuterium labelling. The mass spectra of 1-naphthol (I), 1-naphthol-OD (II), 2,3,4,5,6,7,8-heptadeu-tero-1-naphthol (III) and perdeutero-1-naphthol (IV) indicate that only the hydrogen of the hydroxyl group is involved in the dehydration of the molecular ion. The loss of 29 mass units from the molecular ion yielding m/e 115 ([M-HCO·]) is pre-ceded by hydrogen scrambling to an extent of 25%, while in the further decomposition of the [M-HCO ]-ion complete hydrogen randomization is involved.
Notizen: Evidence of Ml and E2 Strength in the Giant Resonance Region of Ce
Authors: Pitthan R. , Walcher Th.
Published: February 2015

Inelastic electron scattering from Ce (50 and 65 MeV, 93°, 129° and 165°) had shown evidence for an Ml and an E2 resonance at 8.7 and 12.0 MeV, respectively. These assignments have been confirmed by DWBA calculations. Reduced transition probabilities are derived for the resonances mentioned, and for the giant E1 resonance.
Über den Schwellenwert der Pumpenergie von Flüssigkeitslasern im quasistationären Betrieb
Authors: Ketskeméty I. , Kozma L.
Published: February 2015

Threshold Pump Intensity of Flash Lamp Pumped Liquid Lasers Laser parameters of flash lamp pumped dye lasers are interpreted on the base of a simplified term scheme. The obtained formular contain the fluorescence characteristics of the liquid solutions.
Hologramme mit nichtsphärischer Referenzwelle im inkohärenten Strahlungsfeld / Holograms with Nonshperical Reference Wave in Incoherent Radiation Field
Authors: Barlai P
Published: February 2015

Fundamental features of hologram swith a nonspherical reference wave are derived. It is known that a reconstruction of a hologram with arbitrary reference wave is free of aberrations only by exact reproduction of the reference wave.

However, holographic reconstruction with sufficient quality in numerous cases is possible with reduced requirement on the precision of replicating the reference wave. A single condition must be satisfied for that: the spatial crosscorrelation of the intensities of refence and reconstruction wave must have a sharp maximum. Then reconstruction with a spatially extended incoherent light source is also possible.

With this knowledge, some important consequences are stated. E. g. a single holographic re-construction is free of granularity which is necessary for practicable holographic microscopy. More-over, the well-known possibilities of holographic coding and associative storage can be easily realized.
Magnetfeldbeschreibung mit verallgemeinerten poloidalen und toroidalen Skalaren
Authors: Gerlich Gerhard
Published: February 2015

Representation of Magnetic Fields by Generalized poloidal and Toroidal Scalars Every solenoidal vector field can be represented by unique poloidal and toroidal scalars. This description is especially appropriate to the geometry of a sphere. A generalization which can be applied to a more or less complicated geometry could be elaborated by means of transforming integrability conditions of space into integrability conditions of surfaces. This formalism enables us to give simple proofs of other important representations of vector fields by two scalars (magnetic coordinates, complex-lamellar fields).
Algebraische Lösung des Eigenwertproblems im N ΘΘ -Sektor des Lee-Modells / An Algebraic Solution of the Eigenvalue Problem in the N ΘΘ-Sector of the Lee-Model
Authors: Helmers K. , Dewitz H.
Published: February 2015

An Trying to write the NΘ-eigenstates of the Lee-model in a more compact way, we define operators containing the NΘ-scattering-amplitudes. With these operators, the structure of the Hamiltonian can be strongly simplified. - It is now possible to solve the eigenvalue-problem in the NΘΘ-sector with few simple, pure algebraic, calculations.