bluuebunny/crossref_metadata_2025_split huggingface dataset:
Deutung der g-Faktor-Anomalie symmetrisch phenylsubstituierter aromatischer Radikale mit Hilfe eines Hyperkonjugationsmodells
Authors: Plato M. , Möbius K. 
Published: February 2015

Abstract
In a preceding paper we reported on anomalous g-factors of some phenyl-substituted hydro-carbon radicals which show deviations in the order of -1X10-4 from the values predicted by Stone's g-factor theory. This anomaly cannot be explained in the frame of the conventional HMO conjugation model. In this paper we present an explanation of this anomaly which is based on a hyperconjugative coupling between the π-orbitals and the phenyl-σ-orbitals coming into effect by the twisting of the sterically hindered phenyl rings. The predominant effect leading to the observed general reduction of the g-factors is caused by the spin density migration into the phenyl-σ-plane where g-factor considerably smaller than in pure π-systems.
Zur kontaktlosen Messung des elektrischen Widerstandes dünner Schichten. Berechnung des Einflusses der Schichtgeometrie / Contactless measuring of the electric resistance of tnin films. Calculation of the influence of filmgeometry
Authors: Schmand J. 
Published: February 2015

Abstract
Using the formerly described nondestructive method for contactless measuring electric resistances, the film in question is brought in parallel position to a metalplate. The reactance 1/Z of this arrangement is a function of (ω R⃞ C), the product of measuring frequency, resistance per unit area of the film and capacity of the arrangement. With decreasing ω or R the imaginary part of 1/Z rises from 0 to C while the real part passes through a distinct maximum for K=(ω R⃞ C)max·K depends strongly on the geometry of the film. Exact knowledge of K with known ω and C al-lows to determine R⃞ . Therefore 1/Z has been calculated as function of (ω R⃞ C) for the most usual geometries of thin films.
Supraleitung von A15-Phasen der Systeme V —Ga —AI, V-Si-Al, V-Ge-Al und V-Sb-Al
Authors: Müller A. 
Published: February 2015

Abstract
In den ternären Systemen V - Ga - Al. V Si - Al. V - Ge - Al und V - Sb - Al wurden Phasen mit Cr3Si-Struktur (A 15-Typ) untersucht. Kritische Temperaturen und Gitterkonstanten dieser Phasen werden mitgeteilt.
An Mischkristallreihen mit 75 Atom-Proz. Vanadin wurde ein Zusammenhang zwischen kritischen Temperaturen und Quotienten aus berechneten und gemessenen Gitterkonstanten gefunden. Nach dieser Beziehung würde - mit einem aus Gitterkonstanten der Mischkristallreihen extrapolierten Wert - für V3Al mit Cr3Si-Struktur eine hohe kritische Temperatur zu erwarten sein.
Zur Beschreibung der Coulomb-Wechselwirkung in der Quantenelektrodynamik
Authors: Wülfing Arnd 
Published: February 2015

Abstract
The covariance of the scattering theory in the formulations of quantum electrodynamics by GUPTA and BLEULER, by VALATIN, and in the formulation with COULOMB gauge is reinvestigated. The effect of gauge transformations and the effect of time disordering, both generally connected with a Lorentz transformation, compensate each other. For the potential in the GUPTA-BLEULER formulation there exist two different generators of Lorentz transformations.
Lebensdauern der Feinstrukturzustände z4F9/2, z4F7/2, z4G11/2, z4G9/2 und y4G11/2 im Kobalt-I-Spektrum
Authors: Hartrott M. v. 
Published: February 2015

Abstract
Atomic lifetimes of 5 excited states in the Co-I spectrum are determined by a zero field level-crossing experiment. Because of the complex spectrum of Co the radiation scattered by the atomic beam is carefully analysed to establish a correspondence of the observed signals to well defined finestructure levels. Since Co has only the one stable isotope 59Co, the influence of the hyperfine-structure splitting on the width of the depolarisation curves is estimated with special reference to the spectral distribution of the exciting radiation. The following values for lifetimes are deduced:
τ(z4F9/2) = 0.6 × 10-7 s, τ(z4F7/2) = 0.8 × 10-7 s,
τ(z4F11/2) = 1.1 × 10-7 s, τ(z4F9/2) = 1.3 × 10-7 s,
τ(γ4G11/2) = 0.6 × 10-8 s.
Die Energieabhängigkeit der Chemie-Ionisations-Reaktion H(2S)+H2 → H3
++e-
Authors: Comes F.J. , Wenning U 
Published: February 2015

Abstract
The chemiionizaion in hydrogen is measured with the aid of the photodissociation of the H2-molecules. Only the reaction of hydrogen atoms is discussed in this paper. The atoms are produced by the photoabsorption of special wavelengths in the region between the dissociation and ionization limit thereby forming metastable 2S-atoms with a well defined kinetic energy. The energy dependence of the reaction cross section is determined which follows a ν-n -law, where n is found to be between 2 and 3 and ν is the velocity of the atoms.
Linear Stability of a Plasma Diode
Authors: Dobrowolny M , Engelmann F , Sestero A 
Published: February 2015

Abstract
The stability of a plasma diode with respect to longitudinal oscillations is investigated. If there are free particles emitted by the electrodes, the perturbations do not have the same dynamics as they would in an infinite plasma, contrary to the case where only particles trapped in the diode are present. This can be interpreted as due to a coupling of plane waves of different wave lengths, introduced by the boundary conditions at the electrodes. The occurrence of resonant-particle effects, on the other hand, is subjected to precisely the same conditions as in an infinite plasma.
Sauerstoffadsorption und Orientierung dünner Oxidschichten auf (100)-Oberflächen von α-Eisen, untersucht mit Hilfe der Beugung langsamer Elektronen
Authors: Portele F 
Published: February 2015

Abstract
The (110) faces of needle shaped monocrystals of α-iron were cleaned by argon bombardment and annealing. The surface was stepwise oxidized then at various temperatures between 20 °C and 220 °C and investigated by LEED. The well-known c (2 × 2) and c(3 × 1) patterns were obtained with 0.5 - 1.0 and 1.5 -2.0 × 10-6 Torr·sec oxygen. Further oxidation at roomtemperature produced a splitting of the fractional order spots of the c (3 × 1) pattern in the two directions [33̅2] and [33̅2̅]. At elevated temperatures (100° - 220 °C) a change of intensity distribution occurred on lines parallel to [11̅0]. In both cases the position of extra spots is a continuous function of the amount of oxygen given to the surface.
Two kinds of well ordered epitaxial overgrowth of FeO could be observed after oxidizing with 10-4 Torr·sec at 20 °C and subsequent annealing at 150 - 270 °C and above 300 °C respectively. The epitaxial law is (111)FeO ║ (110)Fe and [101̅]FeO ║ [001]Fe in the former case and [1̅10]FeO ║ [11̅1̅]Fe in the latter case. By an analysis of weak extra spots due to multiple reflections a partial adaption of the lattice constant of the first FeO layers to the substrate could be detected (pseudomorphism).
Very strong oxidation produced an overgrowth of spinel crystals with (111) parallel to the surface which were transformed to FeO again by annealing above 360 °C.
Energiemessungen an einem Rubinlaser mit bewegtem Kristall
Authors: Malota F. 
Published: February 2015

Abstract
Energy measurements in a Ruby-Laser with moving crystal Energy measurements were carried out on a Laser with a moving crystal. The energy emitted by a moving crystal could be shown to depend on the velocity. At a crystal velocity of approximately 50 cm/s the energy measured was 1.3 times greater than with stationary crystals.
Gassorption und Photolumineszenz von Zinkoxid
Authors: Nink R. 
Published: February 2015

Abstract
Chemisorption of oxygen decreases the photoluminescence quantum efficiency of zinc oxide phosphors, hydrogen increases the quantum efficiency. The systematical behaviour of two series of reduced and oxydised samples indicates that radiationless surface recombination rates are influenced by electrical fields due to sorption layers. Photodesorption of oxygen is detectable by a slow build up of photoluminescence which is separable from the low temperature build up due to trap filling.
Die magnetische Suszeptibilität der Ladungsträger in Tellureinkristallen
Authors: Schlabitz W. , Geist D. 
Published: February 2015

The anisotropic diamagnetic susceptibility of free holes in pure and antimony-doped tellurium single crystals has been determined in the temperature range from 5 to 300 °K. The susceptibility %L depends on the hole concentration p as %L ∼ p1/3, for concentrations above 1017 cm-3 , according to the behaviour of a degenerate electron gas in a parabolic band.
The magnitude of the susceptibility is in principle determined by the band parameters connected with the relevant spin-split hole states. As an approximation, the Pauli-Landau-Peierls formula has been used with the values of the effective mass tensor as known from magnetoabsorption, cyclotron resonance and Shubnikow-De Haas results (m⊥ = 0,11 m, mⅡ = 0,26 m). Effective g-values g⊥ = 3,5 ± 0,7 and gⅡ = 9,6 ± 0,5 were found. The large deviation from two indicates that the hole states are heavily influenced by spin-orbit interaction.
Untersuchungen zur Stromdichteverteilung eines Lichtbogens im Magnetfeld
Authors: Klüber O. 
Published: February 2015

Abstract
In a cylindrical arc without external magnetic field the radius of the discharge current is identi-cal with that of the conductive plasma column. It is shown here that, in general, this is not the case in an arc with superposed magnetic field. Instead, the current is limited by the magnetic flux tube whose cross section is governed by that of the electrodes. This is still true if the radius of the conductive plasma column is much larger than that of the flux tube. In this case electromotive forces prevent radial expansion of the current carrying region and form a potential distribution in keeping with the current density distribution.
On the Pressure Dependence of the Transport Properties of Dilute Polyatomic Gases
Authors: Mccourt F. R. , Moraal H. 
Published: February 2015

Abstract
It is shown that the transport coefficients of dilute polyatomic gases in the ordinary Navier-Stokes regime contain an extra pressure dependence when the internal state Hamiltonian does not commute with the nonequilibrium distribution function-density matrix for the gas. As a specific example, the pressure dependence of the shear viscosity of a gas of paramagnetic 2Σ molecules is considered. Furthermore, the pressure dependence of the Senftleben and Senftleben-Beenakker effects is discussed and examples are given of the different types of molecules for which pressure dependence in the field-free as well as in the field-dependent transport coefficients may be expected.
Experimentelle Untersuchungen an Drahtexplosionsentladungen im Hochvakuum / Experimental Investigation of Exploding Wire Discharges in High Vacuum
Authors: Niemeyer Lutz 
Published: February 2015

Explosions of 0.03 -0.25 mm diameter wires of Cd, AI, Cu, and W in high vacuum (p < 10-5 Torr) are investigated. The time development of the discharge column is shown to be determined by two main processes: a) In the time preceding the explosion, particles are emitted from the surface of the heated wire and initiate a peripheral discharge. The mechanism of particle emission is found to be evaporation of neutral atoms and/or thermionic emission of charged particles. The latter process is influenced by the strong radial electric field which is caused by the coaxial discharge geometry at the wire surface, b) The wire material vaporizes explosively forming an expanding cloud of nonconducting vapor which is subsequently converted to a plasma by the peripheral discharge penetrating into it from outside.
The discharge column exhibits instabilities which are shown to be of MHD origin. They are significantly reduced by applying an axial magnetic field to the discharge column. A quantitative spectroscopic investigation is performed during the magnetic contraction phase of stabilized 0.05 mm Al wire explosions. The plasma temperature is found to be about 50 000 °K in the axis of the column and higher than 80 000 °K at its periphery. The mean electron density is estimated to be of the order of some 1019 cm-3 .
Dissoziativer Ladungsaustausch von He+ -und Ne+ -Ionen mit den Molekülen N2, O2 und CO2 bei Stoßenergien von 3 bis 200 eV
Authors: Schlumbohm H. 
Published: February 2015

Abstract
Cross sections for the dissociative charge transfer reactions He+ + N2, O2 and Ne+ +N2 , O2, CO2 have been measured over an energy range from 3 to 200 eV and are compared with values given by other authors. The values were determined from measurements of the current of the slow charge exchange ions formed within a collision chamber.
On the Phonon and Polariton Spectrum of LiJO3
Authors: Claus R. , Schrötter H. W . , Hacker H. H . , Haussühl S. 
Published: February 2015

Abstract
Raman spectra of the polar A, E1 and the non polar E2 species of LiJO3 are presented. The number of phonons expected by group theory has been calculated. LO-TO splitting of two E1·phonons could be observed and the polariton associated with the A (z) phonon at 795 cm -1 has been recorded.
Thermal Properties of Alcaline-Earth-Oxides I. Specific heat measurements 1-3 Centre National de Recherches sur les Tres Basses Temperatures
Authors: Gmelin E. 
Published: February 2015

Abstract
The heat capacities of MgO, CaO, SrO, BaO, having NaCl-structure, have been measured with an adiabatic calorimeter capable to measure heat capacities of solids between 1.2 and 340 °K. A mechanical thermal switch is used for specimen cooling and the temperature calibration above 4 °K is performed with a gas thermometer. The values of the specific heats, Cv , are tabulated.
The entropies at 273.15 °K are 27.19; 38.3; 51.9; and 66.9 for MgO. CaO, SrO and BaO respectively, in J/mol °K. The accuracy of the measurements is estimated to be better than 0.8% (smoothed curve).
Holographische Untersuchung von schwingenden piezoelektrischen Quarzplatten
Authors: Lohmann H. D. , Tholl H. 
Published: February 2015

Abstract
The application of holography to the analysis of the vibrations of piezo-electric quartz plates is demonstrated. A series of interference patterns appeared on the vibrating quartz plates as reconstructed by holograms. These patterns were photographed, and the amplitudes of vibration were determined. It is shown that the amplitude of vibration is increased as higher voltages are applied to the quartz. These results are compared with the experimental results of authors using interferometer techniques.
Über die elektronischen Energieniveaus des N-Isopropylcarbazols und seiner Radikalionen
Authors: Klöpffer Walter 
Published: February 2015

Abstract
The first two ionization energies of N-isopropyl carbazole (NIPCA) have been determined to be 7.4 and 8.0 eV. The electron affinity amounts to 0 eV. The energy gap of solid NIPCA is estimated to be about 4.4 eV. Positive and negative radical ions of NIPCA have been prepared by electrochemical oxidation and alkali metal reduction respectively; electronic absorption spectra of the radical ions are presented.
Barrier to Internal Rotation, Centrifugal Distortion Analysis and Structural Considerations of Methanesulfenylchloride
Authors: Guarnieri Antonio 
Published: February 2015

Abstract
An investigation of the microwave spectrum of CH3SC1 35 in the excited torsional state has been carried out. The barrier to internal rotation and other connected parameters are thus obtained. A centrifugal distortion analysis of the microwave spectrum of CH3SC1 35 in the ground state is also performed to predict high J transitions. A /-"-structure and bond axis quadrupole coupling constants are also considered.
The Rotational Spectra and Dipole Moments of AgF and CuF by Microwave Absorption
Authors: Hoeft J. , Lovas F.J. , Tiemann E. , Törring T. 
Published: February 2015

Abstract
The rotational transitions J=1→2 and 2→3 were measured for 107Ag 19F and 109Ag 19F by microwave absorption. These spectra allowed the determination of the Dunham-coefficients Y01, Y11, Y21, and Y02 and from these the potential coefficients a0 and a1 and internuclear distance re were derived. For 63Cu 19F and 65Cu 19F the hyperfine structure was observed in the J=0→1 and 1→2 rotational spectra. In addition to the Dunham coefficients the quadrupole coupling constants, e q Q, and spin-rotation coupling constant, c, for the Cu nucleus were obtained. Stark effect mea-surements on both AgF and CuF resulted in the determination of the electric dipole moment for the ground vibrational state.
Das Verhalten von Tetrafluorkohlenstoff und Tetrafluorkohlenstoff-Krypton-Gemischen im Trennrohr
Authors: Meinrenken J. 
Published: February 2015

Abstract
Das Verhalten von Tetrafluorkohlenstoff und Gemischen mit Krypton im Trennrohr wird experimentell untersucht. Die Auftrennung der Kohlenstoffisotope zeigt ein normales Verhalten, die Trennfaktoren sind jedoch kleiner als bei anderen Kohlenstoffverbindungen. Während die Kryptonisotope untereinander mit zunehmenden CF4-Konzentrationen schlechter getrennt werden, reichert sich um-gekehrt 12CF4 gegen 13CF4 mit steigendem Zusatz von Krypton verstärkt an. 12CF4 wird unter den beschriebenen Versuchsbedingungen gegenüber dem um 10 Masseneinheiten leichteren Kryptonisotop 78 zur warmen Seite transportiert. Somit ist CF4 als quasi-isotopes Hilfsgas zur Auftrennung leichter Kryptonisotope, Krypton als extraktives Hilfsgas zur Anreicherung der Kohlenstoffisotope brauchbar.
Der Einfluß von Gitterdefekten auf die optischen Konstanten von Kupfer / The Influence of Lattice Defects on the Optical Properties of Copper
Authors: Bispinck H. 
Published: February 2015

Abstract
The real and imaginary parts of the dielectric constant of thick copper films are determined in the wavelength range from 0.32 to 2.5 μm. In addition the dc resistivity of the samples is measured. The films are evaporated in ultrahigh vacuum onto cooled substrates and annealed. Thereby the degree of lattice disorder can be reduced stepwise. The optical properties are interpreted by means of a slightly modified Drude-theory for λ > 0.8 μm. The variations of the dc resistivity obtained by optical measurements agree with the results of the electrical measurements.
Über die Existenz einer unbekannten natürlichen α-Aktivität im 4,3 – 4,6 MeV-Bereich
Authors: Meier H. , Albrecht W. , Bösche D. , Hecker W. , Menge P. , Ruckdeschel A. , Unger E. , Zeitler G. , Zimmerhackl E. 
Published: February 2015

Abstract
In vorliegender Arbeit wird nach Diskussion der auf dem Gebiet der natürlichen Radioaktivität offenstehenden Fragen über die bei Aufarbeitung von Platinerzen, speziell von Osmiridium, erhaltenen Ergebnisse berichtet. Die Untersuchungen ergaben, daß in Osmiridiumproben verschiedener Herkunft neben Radionukliden der natürlichen Zerfallsreihen (Konzentration < 1 ppm) eine α-Aktivität im 4,3 -4,6 MeV-Bereich und eine y-Strahlung bei 200 - 220 keV auftritt, die sich keinen bekannten Radionukliden zuordnen läßt.
Der mögliche Zusammenhang zwischen dieser aus Osmiridium angereicherten Aktivität und der von verschiedenen Arbeitsgruppen in Erzen und Mineralien (Molybdänglanz u. a.) beobachteten analogen α-Aktivität im 4,3-4,6 MeV-Bereich wird diskutiert. Audi werden geochemische Effekte erörtert (überhöhte 235U-, 239Pu-Gehalte geologischer Proben u. a.), deren wahrscheinliche Verbindung zur 4,3-4,6 MeV-α-Strahlung die Existenz natürlicher Transuranisotope mit einer Ordnungszahl Z > 96 andeutet. Auf die Frage einer Verbindung zwischen der in platinmetallhaltigen Fraktionen gefundenen Aktivität und in der Natur eventuell vorhandenen superschweren Elementen der Eka-Platinmetallgruppe wird ebenfalls eingegangen.
Multicollisions in the Linearized Boltzmann-Landau Transport Equation
Authors: Mitra Arun K. , Mitra Sunanda 
Published: February 2015

Abstract
The treatment of the linearized Boltzmann-Landau equation in the binary collision approximation given in an earlier paper 4 has been extended, under certain assumption, to include all collision processes. The effect of ternary collisions on the transport coefficients in particular has been obtained in a subsequent paper.
Bestimmung der Molekülstruktur des N-Chlor-Schwefeldifluoridimids mit Hilfe der Elektronenbeugung an Gasen
Authors: Haase J. , Oberhammer H. , Zeil W. , Glemser O. , Mews R. 
Published: February 2015

Abstract
Mit Hilfe der Elektronenbeugung an Gasen wurde die Mo-lekülstruktur des N-Chlor-Schwefeldifluoridimids bestimmt. Aus drei Strukturbestimmungen ergaben sich folgende Werte für die geometrischen Molekülparameter:
Cl - N = 1,723 ± 0,004 Å; ∢ ClNS = 120,0 ± 0,2 °;
S - N = 1,476 ± 0,003 Å; ∢ NSF = 111,2 ± 0,1 °;
S - F = 1,596 ± 0,002 Å; ∢ FSF = 89,3 ± 0,2 °.
Die Ergebnisse für die Schwingungsamplituden werden angegeben.
Zur Interpretation der Elektronenverteilungen nach dem SCF-MO-P(LCGO)-Verfahren
Authors: Preuss H. 
Published: February 2015

Abastract
Nach einem kurzen Überblick über das SCF-MO-P (LCGO)-Verfahren werden die verschiedenen Möglichkeiten diskutiert, die sich aus einer Analyse der Elektronenverteilungen ergeben. In diesem Zusammenhang werden bestimmte graphische Darstellungen (Diagramme) angegeben.
Anwendung der Eigenkanal-Theorie auf die Coulomb-Anregung von Atomkernen
Authors: Greiner Bernd 
Published: February 2015

Abstract
The eigenchannel method is applied to Coulomb excitation. The formalism is developed and the involved matrix elements are calculated analytically. Estimates for the density of internal states are given. This method should prove fruitful for the calculation of quantum mechanical corrections of the semi-classical treatment of Coulomb excitation.
Bestimmung der Kraftkonstanten der Hexafluoro-Komplexe des Technetium(IV) und Rhenium(IV) auf der Basis der D4h-Symmetrie
Authors: Krasser Wolfgang , Schwochau Klaus 
Published: February 2015

Abstract
The infrared spectra of potassium and cesium hexafluorotechnetate (IV) and -rhenate(IV) show a D4h-distortion of the octahedral complex ions. The splitting of degeneracies is not due to site symmetry. The linear combinations of the force constants of the irreducible representations A2u and Eu are determined in the valence force field on the basis of D4h-symmetry. As expected the force constants of stretching vibrations of [TcF6]-- are then smaller than those of [ReF6]--.
Diffusion in binären Gemischen von H2, HD und D2 bei 24 °C / Diffusion in Binary Mixtures of H2, HD and D2 at 24 °C
Authors: Müller K. P. , Klemm A. 
Published: February 2015

Abstract
Diffusion in a cylinder followed by catarometric analysis allowed to measure the inter-diffusion coefficient D in the systems H2-HD, H2-D2 and HD-D2 at 24 °C and 760 Torr with an estimated error of ±1% . A dependence of D on concentration did not show up.
A least square fit combining the new measurements with less accurate earlier ones on system containing tritium, yields the three coefficients of the expansion
(√μ̅D)I II = 0.0006 mI II-0.023(m2
13-m2
24) + 0.010 (m2
AC + m2
BD - m2
ac - m2
bd).
μ is the reduced mass of the two molecules of a mixture, and in general xik=(xi-xk) / (xi + xk). Roman numbers as indices indicate mixtures, arabic ones molecules and letters atoms. As for the masses mI=m1 + m3, mII=m2+m4, m1= mA+mC, m3= mB + mD,m2 + mc, m4=mb+md.
The signs of the first two coefficients in the expansion agree with the second Chapan-Enskog approximation, and that of the third coefficient with the model of loaded spheres.
Die Oxidationsgeschwindigkeit von Legierungen des Kupfers mit Aluminium, Chrom und Mangan
Authors: Frohberg M. G. , Pötschke J. , Mathew P. M. 
Published: February 2015

Abstract
Die Temperaturabhängigkeit der Geschwindigkeitskonstanten für die innere, äußere und gesamte Oxidation wurde im Bereich zwischen 900 und 1000 °C für Legierungen des Kupfers mit Aluminium, Chrom und Mangan experimentell bestimmt.