bluuebunny/crossref_metadata_2025_split huggingface dataset:
Properties of the Quantum Double Oscillator
Authors: Brickmann Jürgen 
Published: February 2015

Abstract
A formalism is presented to obtain approximate analytic expressions for the eigenstates and eigenvalues of a quantum double oscillator (QDO). The matrix elements of a large class of operators with respect to states of different double oscillators result as finite sums of explicit functions of the respective parameters. Matrix elements between states of a harmonic oscillator and a double oscillator are also determined. The analytic expressions were used to calculate Franck-Condon factors for electronic transitions including double oscillator anharmonicities.
The Microwave Spectrum of 2,6-Difluoropyridine I. Assignment and Complete Structure by DRM Spectroscopy
Authors: Stiefvater Otto L. 
Published: February 2015

Abstract
Double resonance modulated (DRM) microwave spectroscopy has been used for the assignment of the rotation spectrum of 2,6-difluoropyridine, and for the study of 10 non-equivalent isotopic forms of this compound. All 13C and 15N spectra were observed in their natural abundances. From these data the complete structure of 2,6-difluoropyridine has been derived. The geometry of the ring was determined independently in two reference frames.
Bond distances (in Å, uncertainties 0.001 Å) an bond angles (in degrees, uncertainty 0.1°) are as follows: N(1)-C(2/6) = 1.3168, C(2/6)-C(3/5) = 1.3767, C(3/5)-C(4) = 1.3941, C(2/6)-F(2/6) = 1.347, C(3/5)-H(3/5) = 1.0795, C(4)-H(4) = 1.0822. Angles: C(2)N(1)C(6) = 115.0, N (1)C(2/6)C(3/5) = 126.5, C (2/6) C (3/5) C (4) = 116.1, C(3)C(4)C(5) = 119.8, N(l)C(2/6)F(2/6) = 114.7, C (2/6) C (3/5) H (3/5) = 120.8 and C (3/5) C (4) H (4) = 120.1. These data represent the first quantitative experimental verification of previously postulated distortions of the pyridine ring under substitution.
Notizen: Monitoring Chemical Reactions by Variable Temperature Photoelectron Spectroscopy. A New Thermal Reaction
Authors: Schäfer Werner , Schweig Armin 
Published: February 2015

Abstract
Variable temperature photoelectron (vtpe) spectroscopy is applied to ethane-1,2-dithiol. Thereby it is shown that this molecule thermally reacts to thiirane and hydrogen sulphide at the very low pressure applied in the pe experiment.
Scalarproducts of Spinor Field Functionals and State Representations in Nonlinear Spinor Field Quantum Theory
Authors: Stumpf H. 
Published: February 2015

Abstract
In preceding papers it was shown that in nonlinear spinor theory cross-sections of elementary particle scattering processes can be calculated only if the state representations and their scalar products are explicitly known. To obtain these quantities, functional quantum theory of the non-linear spinor field was introduced-In this paper it is demonstrated that the introduction of functional scalar products in functional quantum theory is equivalent to impose restrictions to the spinor field operator itself concerning its groundstate behaviour. Performing this, explicit state representations of spinor field states as well as corresponding scalar products can be derived, leading thus to functional quantum theories of the spinor field in dependence on the groundstate model. It follows from these considerations that a spinor field quantum theory is in principle in-complete, as long as no additional assumptions on the groundstate are made, which cannot be derived from the general dynamics of the field.
Spin-Gitter-Relaxation im Triplett-Zustand von Chinoxalin in Perdeutero-Naphthalin und zwei ähnlichen Mischkristallen
Authors: Konzelmann U. , Kilpper D. , Schwoerer M. 
Published: February 2015

Abstract
Spin Lattice Relaxation in the Triplet State of Qainoxaline in Perdeuteronaphthalene and of two Similar Mixed Crystals The spin lattice relaxation in the excited triplet state of three mixed crystals was investigated: Quinoxaline in perdeutero-naphthalene, quinoxaline in naphthalene (X-traps) and quinoxaline in durene. They differ by the depth of their traps, which are shallow (90 cm -1), very shallow (60 cm -1) and deep (6600 cm -1), respectively. In order to identify the relaxation processes and the relaxation mechanism, the experiments were performed in the large magnetic field range be-tween 0.2 T and 5.4 T. By use of a non-resonant optical method and by ESR and ODMR it could be shown that at high fields the direct process (emission of resonant phonons) is the only efficient process up to 4.2 K. At low fields Raman-processes are dominant. Thereby the spin lattice relaxation probability per unit time, w, increases with the ninth power of the temperature in the shallow trap systems and with the fifth power in the deep trap system. By the analysis of the very strong anisotropy of w it could be shown that the efficient relaxation mechanism in the shallow trap systems is a guest-host-interaction modulated by phonons.
Nachweis von Inhomogenitäten bzw. Konzentrationsfluktuationen in Schmelzen des Systems Al-In mittels Röntgen-Kleinwinkelstreuung
Authors: Hoehler Jochen , Steeb Siegfried 
Published: February 2015

Abstract
By means of small angle X-ray diffraction work it was revealed that ball-shaped segregated regions with diameters of 8 up to 10 Å exist in molten Al-In alloys. Interpretation of segregated regions as originated by concentration fluctuations shows, according to the method of Ornstein-Zernike, that the correlation length is approximately 3 Å. According to the method of modulation of monotonic Laue scattering, positive values between 0.04 and 0.2 for the coefficient of short range order were obtained. Apparently the melts consist of a matrix with statistical distribution of the atoms of both kinds together with two kinds of ball-shaped segregated regions, one kind containing only Aluminium-, the other only Indium-atoms. A plot showing the variation of volume concentration wAIT of Aluminium regions versus total concentration wT of regions of any kind is given: wT may reach from 0.2 up to 30 vol.-%.
Measurement of Stark Broadening and Shift of the Helium I Line λ =4471.5 Ä and its Forbidden Component λ =4470 Ä for Electron Densities 7 · 1014 ≲ Ne [cm-3] ≲ 3 · 1016
Authors: Diatta C. S. , Czernichowski A. , Chapelle J. 
Published: February 2015

Abstract
The profiles of the HeI line λ=4471.5 Å (43D-23P) and its forbidden component λ=4470 Å (43F - 23P) have been measured for electron densities Ne ranging from 7 · 1014 cm -3 to 3 · 1O16 cm-3 . The line was emitted from a continuous afterglow plasma emerging from a plasmatron device. The working pressure ranged from 100 Torr to 2 atmospheres. Our measurements agree with those of Bekefi et al. (1971), Bretagne et al. (1971/1973) and Drawin and Ramette (1974). Relatively by large discrepancies are found with some theoretical calculations. Our measurements include the very interesting density region from Ne=2 · 1015 cm-3 to Ne = 1 · 1016 cm-3 for which only a very few experimental data are available.
r0-Structure, Partial r-Structure, and Nitrogen Nuclear Quadrupole Coupling Constants of N-Nitroso-dimethylamine
Authors: Guarnieri A. , Rohwer F. , Scappini F. 
Published: February 2015

Abstract
The microwave spectra of (CH3)2
15NNO, (CH3)2N15NO, syn-13CH3
12CH3NNO and anti-13CH3
12CH3NNO have been studied and the rotational constants evaluated. With these data and former results 1 the rs-structure of the carbon-nitrogen frame has been found to be planar. An r0-structure has also been calculated. From the hyperfine structure of the spectra the nuclear quadrupole coupling constants of the nitrogen nuclei have been determined. Further studies to complete the rs-structure are in progress.
Parametric Side-Scattering by Waves Near the Hybrid Resonance Frequencies in Inhomogeneous Plasmas
Authors: Shukla P. K. , Yu M. Y. , Spatschek K. H. 
Published: February 2015

Abstract
The temporal growth rates are calculated for side-scat-tering of light by modes near the upper and lower hybrid frequencies in a turbulent, inhomogeneous plasma.
Plasma Correlation Effects on Stark Broadening
Authors: Capes H. , Voslamber D. 
Published: February 2015

Abstract
The influence on spectral line profiles of a possible coupling between the low and high frequency parts of the plasma microfield, and of ternary plasma correlations is investigated. Both effects may have some importance in high density plasmas (e. g. arc experiments), but the first of them is shown to be generally predominant.
The Energetics of Formation of Doubly Charged Benzene Ions by Field Ionization
Authors: Röllgen F. W. , Heinen H. J. 
Published: February 2015

Abstract
Using a retarding potential energy analyzer the appearance potential of doubly charged benzene ions formed by field ionization was found to be 14.0 ± 0.3 eV. This appearance potential supplies evidence for the desorption of C6H6
++ ions in a chainlike structure from the surface of the field anode.
Secondary Electron Emission from Conductive, Liquid Polyethylene Glycol 1500
Authors: Doblhofer K. , Charlé K. P. , Veltwisdi D. 
Published: February 2015

A thorough study of the secondary electron emission (SEE) yield from liquid Polyethylene glycol 1500 (PEG) was made. This liquid (m. p. 45 °C) has a low enough vapor pressure at a working temperature of about 50 °C. In addition, it has the advantage of being a good solvent for salts which dissociate and thus render the solutions conductive. It was found that the presence of the electrolyte salt does not affect the secondary electron yield curves.
A striking result is that the yield curves obtained from the PEG solutions are very well reproducible (ca. ± 7%). By fitting the experimental data to a formula given by the elementary theory of SEE it can be clearly seen that this liquid polymer shows quite a different SEE behaviour compared with that reported for chemically similar solid polymer films. The results obtained agree well with the data for polymer silicon oils, suggesting that liquid polymers differ in their SEE behaviour from the corresponding solids.
Finally, it is demonstrated that the reduced yield curves can be fitted to the physically meaningful Bethe loss formula at least as well as using the conventional approach.
On Hypermomentum in General Relativity I. The Notion of Hypermomentum
Authors: Hehl Friedrich W. , Kerlick G. David , Heyde Paul von der 
Published: February 2015

Abstract
In this series of notes, we introduce a new quantity into the theory of classical matter fields. Besides the usual energy-momentum tensor, we postulate the existence of a further dynamical attribute of matter, the 3rd rank tensor ⊿ijk of hypermomentum. Subsequently, a general relativistic field theory of energy-momentum and hypermomentum is outlined. In Part I we motivate the need for hypermomentum. We split it into spin angular momentum, the dilatation hypermomentum, and traceless proper hypermomentum and discuss their physical meanings and conservation laws.
Die Struktur epitaktisch aufgedampfter Goldfilme
Authors: Fischer W. , Wißmann P. 
Published: February 2015

Abstract
Gold films of 400 Å thickness were evaporated under UHV-conditions on (111)-, (110)-and (100)-oriented silicon substrates and were subsequently investigated by x-ray diffraction. Mainly the influence of orientation and cleanliness of the substrate on film structure was studied.
Informations on the orientation and size of the crystallites as well as on lattice distortions were obtained by analysing intensity, angular displacement and width of the diffraction peaks. It is found that the gold films show a preferred (111)-orientation in all cases; only the degree of orienta-tion changes with the pretreatment of the substrate. The size of the (111)-oriented crystallites cor-responds to the film thickness, and a noticeable density of intrinsic stacking faults can be detected.
Relaxation der Volumsviskosität in Wasser-t-Butanolmischungen im Gigahertz-Bereich / Relaxation of the Bulk — Viscosity in Water t-Butanol, Mixtures in the Gigahertz Region
Authors: Asenbaum A. 
Published: February 2015

Abstract
In water t-butanol mixtures hypersound velocities and hypersound damping were measured at 25 °C by Brillouin scattering. From a comparison of the results of this work with ultrasonic data the velocity dispersion, the nonrelaxing and the relaxing fraction of the bulk - viscosity, and the relaxation frequency were calculated.
Mechanism and Structure in the Ion Chemistry of Tetramethyldiphosphine: An Ion Cyclotron Resonance Spectrometric Study
Authors: Wanczek Karl-Peter 
Published: February 2015

Abstract
The mass spectrum of tetramethyldiphosphine and the ion chemistries of this compound and of its mixtures with phosphine and dimethylphosphine have been investigated by ion cyclotron resonance spectrometry. Numerous ion molecule reactions have been observed. The rate constants of the two most abundant ions formed by the molecular ion, the tetramethyldiphosphonium ion, H(CH3)2P-P(CH3)2
+ and the hexamethyltriphosphonium ion, P3(CH3)6
+ , are k2.35≦0.1X10-10 cm3 molecule-1 s-1 and k2.40 = 1.5 X10-10 cm3 molecule -1 s -1 respectively. The structures of several ions have been determined with the aid of their ion-molecule reactions. The ions m/e = 79 and 93 are thought to have the structures HP - P(CH3)H+ and HP-P(CH3)2
+ . The most probable structures of the ions m/e = 169 and 183 are HP(CH3)2-P(CH3)-P(CH3)2
+ and (CH3)2P-P(CH3) - P(CH3)3
+ . The protonated molecule undergoes several ion-molecule reactions, which proceed via an intermediate, m/e = 183, [(CH3)6P3
+]* which is detected by double resonance experiments.
The Rotational Spectrum of Monothioformic Acid. I. cis-and trans-HC(:O)SH1,2
Authors: Hocking William H. , Winnewisser Gisbert 
Published: February 2015

Abstract
The rotational spectra of the two abundant isomers of monothioformic acid, cis- and trans- HC(:O)SH, have been assigned in the frequency region 8 -250 GHz. Over 90 a-type transitions and over 60 b-type transitions have been measured for each rotamer. The a-type transitions belong to the qRK , qQ1, qQ2, qQ3 and qQ4 branches and the b-type absorption lines encompass the Ka = 1 - 0, 2 - 1, 3 - 2, 4 - 3 and 5 - 4 rotational sub-bands. The rotational constants and all quartic and sextic centrifugal distortion constants have been determined for each rotamer using Watson's reduced Hamiltonian. In addition to the measured line positions the frequencies of some selected low-J transitions, not observed in this work but of potential astrophysical interest, have been listed as an aid in the interstellar search for monothioformic acid.
Use of 95Mo NMR Spectroscopy as a New Approach to Structural Analysis of Diamagnetic Molybdenum Complexes
Authors: Lutz O. , Nolle A. , Kroneck P. 
Published: February 2015

Abstract
Fourier Transform NMR measurements of 95Mo and 97Mo are reported for several molybdenum compounds in different oxidation states. Using the molybdate ion as a reference, chemical shifts from about +500 ppm to about -1900 ppm have been observed. Experimental parameters and a chemical shift scale are given.
Kinetics of MgWO4 Formation in the Solid State Reaction between MgO and WO3
Authors: Flor Giorgio , Riccardi Riccardo 
Published: February 2015

The solid state reaction of MgWO4 formation from MgO (single crystals) and WO3 was investigated in the temperature range 800 - 985 °C under both air and argon atmosphere.
The techniques employed for the kinetic study (contact and thermogravimetric methods) allowed to point out that the process follows the linear rate law in the early stages and the parabolic one in the subsequent stages.
From inert marker experiments, kinetic determinations under the two different atmospheres and conductivity measurements, it was possible to state that the reaction is governed by a cation counterdiffusion mechanism
On the Analysis of the Activation Volume
Authors: Rrausz A. S. 
Published: February 2015

Abstract
The stress and temperature dependence of the activation volume is often explained by a similar dependence of the measured stress sensitivity. This explanation cannot be reconciled with the nonconservative motion of jogs, with dislocation climb, nor with the intersection mechanism. It is in contradiction with the results obtained in direct dislocation velocity measurements as well.
It is now shown that when the backward movement of the dislocations is taken into consideration an explanation, consistent with the rate theory and with the dislocation mobility observations, can be developed. The analysis shows that with constant activation volume the stress sensitivity is stress and temperature dependent, in agreement with the corresponding measurements and mechanisms.
On Hypermomentum in General Relativity III. Coupling Hypermomentum to Geometry
Authors: Hehl Friedrich W. , Kerlick G. David , Heyde Paul von der 
Published: February 2015

Abstract
In Part I1 of this series we presented the notion of the material hypermomentum current and motivated its introduction into general relativity. In Part II2 we showed that a general, linearly connected manifold with symmetric metric (L4, g) is the appropriate geometrical framework for such an introduction. The present paper completes the picture by giving dynamical definitions for energy-momentum and hypermomentum for a minimally coupled material Lagrangian. We derive and discuss the field equations of a new metricaffine gravitational theory which embodies these notions.
Die 14C-Aktivität der Atmosphäre von 1952 bis 1971 nach Messungen von Wein-Äthanol
Authors: Zimen K. E. , Brits R. 
Published: February 2015

Abstract
14 C in the Atmosphere from 1952 to 1971 According to Measurements of Wine Ethanol Previous measurements of 14 C in German wines (vintages 1952 — 1967) have been extended up to 1971 and are supple-mented by a series of samples from the southern hemisphere.
Eigenschaften von Tunnelkontakten auf den fünfwertigen supraleitenden Übergangsmetallen Nb, Ta und V / Properties of tunneling junctions on the superconducting transition-metals Nb, Ta, and V
Authors: Gärtner K. , Hahn A. 
Published: February 2015

Abstract
Well-developed phonon-structures are observed on Ta/Ta-Oxid/Ag and Nb/Nb-Oxid/Ag tunneling junctions, if the conditions of oxidation are suitably choosen. These structures are analyzed ac-cording to McMillan's numerical program and the results are discussed. From the nonlinear current-voltage characteristics in the normal state, informations are obtained on the electronic structure of the semiconducting oxid presenting the barrier. Impurity concentration leading to a nonideal semiconductor gap in the oxid, seems to be largely reduced if oxidation is performed with low oxygen pressure.
Investigation of the Structure and the Plasma Parameters in a "Critical Velocity" Rotating Plasma
Authors: Himmel G. , Möbius E. , Piel A. 
Published: February 2015

Abstract
The structure and the plasma parameters of a rotating plasma showing Alfvén's critical velocity were investigated for the first time by means of Langmuir probes. It was demonstrated that the occurrence of the critical velocity is causally connected with the formation of a spoke structure. The electron temperature and the plasma density were determined with local resolution by which a detailed balance concerning the plasma density and the current transport became possible. The importance of turbulent electron heating for rapid ionization at the critical velocity is emphasized. In this process the modified two-stream-instability obviously plays an outstanding role.
1/f-noise Generated by Constrained Diffusion through a Flux-controlling Boundary
Authors: Frehland E. 
Published: February 2015

Abstract
Calculations for constrained (one-dimensional) diffusion of current carriers in an external field are made, which concern the spectral density of fluctuations resulting from the relaxation of spatial concentration perturbations. Two different model calculations are presented: First diffusion in an infinite medium. In this case the spectral density of concentration fluctuations shows a 1/f behaviour, but the spectral density of current fluctuations does not. Second the diffusion in a semi-infinite medium is treated. The flux through the boundary (e. g. pore end) is assumed to be pro-portional to the concentration of current carriers at this boundary. In this case concentration as well as current exhibit 1/f behaviour. The results indicate that the existence of flux controlling boundaries (contacts) may be decisive for the occurence of 1/f noise.
Refractive Index Measurements on Fused LiNO3 , RbNO3 and CsNO3 with a Modified Thermooptic Technique
Authors: Karawacki Ernest , Gustafsson Silas E. 
Published: February 2015

Abstract
A modified method for measuring absolute values of the refractive index and its temperature dependence is presented. A direct comparison is made between the refractive index of a liquid sample and ambient air. Values for LiNO3 , RbNO3 , and CsNO3 within a temperature interval of about 80 K above the melting point for several different wavelengths are presented as well as the calculated values of the molar refractivity and the absorption lines of the NO3
- ion.
Partial Structure Factors in Multicomponent Liquid or Amorphous Alloys
Authors: Blétry J. 
Published: February 2015

Abstract
The structure of a υ component liquid or amorphous alloy is analyzed in terms of υ(υ+1)/2 independent partial structure factors which are associated to the different correlations between the numbers of particles of all chemical species. This formalism, which is specially adapted to the study of alloys of more than two components, is related to Fournet-Faber-Ziman and extended Bhatia-Thornton theory. Sum rules, inequality relations and limiting values are calculated in the static approximation and Debye pair expressions of the structure factors are derived in the isotropic approximation.
17O and 33S Fourier Transform NMR Studies in Thiosulfate and Thiomolybdate Solutions
Authors: Lutz O. , Nepple W. , Nolle A. 
Published: February 2015

Abstract
Fourier Transform NMR measurements of 17O and 33S are reported for several aqueous sulfate, thiosulfate, molybdate and thinftnolybdate solutions. Using informations from 17O signals, 33S NMR lines are assigned. Experimental parameters, chemical shifts and linewidths are given.
The Rotational Spectrum of Monothioformic Acid. III. Dipole Moment and Relative Intensity Measurements1,2
Authors: Hocking William H. , Winnewisser Gisbert 
Published: February 2015

Abstract
The molecular electric dipole moment of each of the two planar thiol rotamers of monothio-formic acid, in its ground state, has been determined from Stark effect measurements. The results are for cis-HC(:O)SH: μa=1.805(1) D, μb = 2.228(1) D and μ=2.868(1) D; whereas for trans-HC(:O)SH: μa = 1.366(1) D, μb = 0.702(1) D and μ = 1.536(1) D. Additional Stark effect measurements on HC(:O)SD and DC(:O)SH have yielded the direction of the dipole moment in each rotamer. The energy difference between the ground vibrational states of cis-and trans-HC(:O)SH has also been determined by relative intensity measurements. The cis rotamer is found to lie at higher energy than the trans rotamerb y 2767(7) J·mol-1 (231.3(6) cm-1 or 661.3(17) cal·mol-1).
Physical Triplet Quenching by Electron Donors
Authors: Steiner Ulrich , Winter Gerhard , Kramer Horst E. A. 
Published: February 2015

Abstract
Absolute radical yields, as determined by flash spectro-scopy, are reported for the reaction of the thionine triplet 3TH+ and its protonated form 3TH2
++ with a variety of electron donors in methanolic solution. The different yields, extrapolated to infinite donor concentrations, are due to partial physical quenching of the triplets in the electron transfer reaction. The results are indicative of a triplet exciplex as an intermediate in the electron transfer reaction.
Self-diffusion of Tin in a liquid Tin-Lead alloy at the Eutectic Composition
Authors: Kurlat D. H. , Rosen M. , Quintana G. 
Published: February 2015

Abstract
By the shear cell technique, the self-diffusion coefficient (DSn) of tin in a liquid Sn - 38.1 wt% Pb alloy has been measured in the temperature range 466 to 786 K. The slope of the DSn vs. T curve decreases up to about 573 K, where it gets constant. This behaviour may be explained by the cluster hypothesis.