bluuebunny/crossref_metadata_2025_split huggingface dataset:
The Oxidation of Formyl Radicals
Authors: Washida N. , Martinez Richard I. , Bayes Kyle D. 
Published: February 2015

Steady state concentrations of formyl radicals were measured with a photoionization mass spectrometer. The reaction of ethylene with oxygen atoms in a system free of O2 was used to form CHO and CH3. Preliminary experiments showed that the reaction of methyl radicals did not interfere with the CHO measurements. By using low concentrations of O and short reaction times, it was possible to observe the initial growth of the CHO concentration. From the rate of approach of CHO to its steady state concentration, the absolute rate constant for the reaction O + CHO was determined to be (2.1+0.4)×10-10 cm3 molecule-1 sec-1. Addition of molecular oxygen to this system caused a decrease in the steady state CHO concentration, due to the reaction,
CHO+O2→HO2+C0
as was suggested by Groth and coworkers in 1938. The rate constant for this reaction was calculated to be (5.7±1.2)×10-12 cm3 molecule-1 sec-1. The importance of these rate constants for combustion and atmospheric reactions are discussed briefly.
Investigations on Instabilities of Electric Arcs
Authors: Ragaller K. 
Published: February 2015

A general formalism is derived, that allows the evaluation of magnetic instabilities of all types of electric arc.
It is shown that a stability criterion exists which is determined by the interaction between the magnetic forces, the frictional force and the so-called isotherm movement. This criterion can be expressed in terms of a dimensionless parameter Mk: when Mk is smaller than a critical value Mkcr, then the arc is absolutely stable, when Mk = Mkcr a stationary, deflected condition arises, and when Mk>Mkcr the arc is unstable. Depending on the magnitude of the growth rate however, a convective stabilisation, caused by an axial flow component, can result.
The results of the theory are applied to a variety of technically interesting arcs, such as axially blown arcs, arcs in gaps and transversely blown arcs.
The Millimeter Wave Spectrum of DCNO: An Example of Current Measurements in the Frequency Range from 60 to 350 GHz
Authors: Winnewisser Manfred , Winnewisser Brenda P. 
Published: February 2015

An efficient system for preliminary data reduction is described which completes a recently developed data acquisition and reduction system for the measurement of millimeter wave absorption lines with the help of a dedicated computer. A simple method of automatically determining the absorption line centers is given.
Rotational transitions of DCNO, measured with the above system, are reported for the ground state and the first excited state of each of the two bending modes ν4 and ν5. The rotational and rotation-vibration constants obtained for these states are
B0 = 10,292.48340 (31) MHz, D0 = 3.5418 (10) kHz,
Bν4 = 10,306.00780 (45) MHz, Dν4 = 3.6409 (22) kHz,
Bν5 = 10,338.65942 (32) MHz, Dν5 = 3.6208 (16) kHz.
The l-type doubling constants q.t
0) and qt
(1) agree with the values obtained previously from direct l-type doubling transitions.
Knudsen Corrections for the Senftleben-Beenakker Effect of Viscosity
Authors: Vestner H. 
Published: February 2015

Abstract
A rarefied polyatomic gas between infinite parallel plates which is subject to a pressure gradient and to a magnetic field is considered. The tensor polarization and the Kagan polarization account for the influence of the field on the gas flow. In the slip flow regime differential equations and boundary conditions for the velocity and the tensor polarization are solved. The dependence of the solution on the mean pressure and on the magnetic field is discussed. Knudsen corrections for the Senftleben-Beenakker effect of viscosity are derived. By comparison with experimental data of Hulsman et al. a set of surface parameters is obtained. They characterize mechanical slip, thermomagnetic slip, and the influence of gas-wall collisions on the tensor polarization.
Radiation Field of a Uniformly Moving Charge in an Anisotropic Medium
Authors: Sastry G. P. , Majumdar S. Datta 
Published: February 2015

Abstract
Fourier integrals are set up for the field of a point charge moving uniformly in an arbitrary direction in a uniaxial medium anisotropic in ε only. The integrals break up into several parts two of which yield the ordinary and extraordinary cones with uniform azimuthal potential distribution. The remaining integrals neither contribute to the energy radiated nor affect the size and the shape of the cones, but merely distort the field within the cones. The integrals are evaluated exactly in the non-dispersive case and closed expressions for the potential are obtained. In the dispersive case, the radiation field is determined by using the asymptotic form of the Hankel functions occurring in the integrand. The resulting expressions exhibit the high azimuthal asymmetry characteristic of anisotropic fields. From the expressions derived for a pure dielectric the potential in a doubly anisotropic medium is obtained, without a fresh calculation, by making appropriate substitutions for the coordinates of the field point and the components of the dielectric tensor.
Normal Coordinate Analysis and Mean Amplitudes of Vibration of Halate Ions
Authors: Sanyal Nitish K. , Dixit L. 
Published: February 2015

Abstract
A normal coordinate analysis of halate ions, viz. 35ClO3
-, 37ClO3
-, Br16O3
-, Br18O3
- and IO3
- has been carried out using a general valence force field and Wilson’s F -G matrix approach. Mean amplitudes of vibration for bonded halogen-oxygen and non-bonded oxygen-oxygen distances have been reported using Cyvin’s method and Müller’s L-matrix formalism. Effects of isotopic substitution and isotope frequency shifts are also examined.
Study of the C-D Stretching Vibration Bands v1 of DCCF and DCCBr
Authors: Huhanantti Mikko 
Published: February 2015

Abstract
The rotational structures of the ν1 bands of the deuterated monohaloacetylenes DCCF and DCCBr were investigated. The rotational constants B in the ground state and in the vibrational states involved were obtained. The centrifugal distortion constants D were calculated from the force constants and the geometrical data, too. The results D = 8.7 x 10-8 cm-1 for DCCF and D = 1.9 x 10-8 cm-1 for DCCBr are compatible with the experimental values (12 ± 4) x 10-8 cm-1 and
(2±2) x 10-8 cm-1, respectively.
Schwingungsberechnungen der isotopen VOCl3-Moleküle, des VOBr3 und der Verbindungen VOCln Br3-n , sowie einige Molekularkonstanten der Titelverbindungen
Authors: Hovdan H. , Cyvin S. J. , Brockner W. 
Published: February 2015

Abstract
In order to determine the isotopic splittings of the vibrational frequencies of isotopieally substituted vanadium oxytrichloride and to present the correlation between VOCl3 and VOBr3 a set of force fields was constructed for the isotopic species of VOCl3 , VOCl2Br, VOCIBr2, and VOBr3 . The conventional descriptions of the fundamentals are supported by the calculated potential energy distribution in all cases. Furthermore the calculations of certain molecular constants such as the mean amplitudes, their corresponding K-values, the Coriolis coupling constants of the

-type and some thermodynamic quantities have been performed.
Transport Processes in TlI and in the AgI-TlI-System
Authors: Sdiiraldi A. , Magistris A. , Pezzati E. 
Published: February 2015

Abstract
The transport properties of TlI and of the system AgI -TlI were investigated by measuring the electrical conductivity, σ , and the electronic and ionic transport numbers. A particularly high electronic conductivity was detected in β-TlI, while the a phase showed a predominant anionic contribution, as in TlCl and TlBr. The intermediate compounds, AgTl2I3 and AgTlI2, are silver ion conductors, but they exhibit low σ values. A comparison with other poliiodides, with a high silver ion conductivity, is suggested on the basis of the crystal bond ionicity.
Mikrowellenrotationsspektren der Molekeln CsF, CsCl, CsBr und CsI
Authors: Honerjäger R. , Tischer R. 
Published: February 2015

Abstract
Microwave rotational spectra of the cesium-halides have been measured in the 1 cm-wavelength region and could be extended to relatively high vibrational states. The results were combined with Gordy’s mm-mavelengths and yield the 8 Dunham energy coefficients Y01, Y11 , Y21 , Y31 , Y02, Y12,Y03 and Y04.
Scattering of Ions VI. Elastic Scattering of N+ on Ne, Ar, Kr, and Xe
Authors: Weise H.-P. , Mittmann H.-U. 
Published: February 2015

In the elastic differential cross-section of the N+-rare gas systems two different types of oscillations have been observed. At an energy of a few eV a primary rainbow was detected for all systems. In the case of N+ - Ar, secondary rainbows were resolved too. From these experimental data the potential depths were determined to be: ε (N+ - Ne) = 0.4 eV, ε (N+ - Kr) = 0.29 eV, ε
(N+ - Xe) = 0.92 eV. For the system N+ - Ar the shape of the reduced potential was obtained by evaluating the positions of the secondary rainbow extrema. The potential depth was found to be 2.16 eV. At higher energies and large scattering angles additional oscillations appeared which are presumed to be Stueckelberg oscillations. For N+ - Ne a single group of strongly marked oscillations appeared up to the highest energies used (EL = 220 eV). In the case of N+ - Ar the amplitudes of these undulations are strongly quenched. For N+ - Kr and N+ - Xe several groups of oscillations with different amplitudes and frequencies seem to be superimposed in the differential cross-section. They are attributed for all systems to crossings of the incoming state with the charge exchanged state.
Molecular Structure, Quadrupole Coupling Tensor and Dipole Moment of Ethyl Cyanide
Authors: Heise H. M. , Lutz H. , Dreizler H. 
Published: February 2015

The microwave spectra of CD3CH2CN, 13CH3CH2CN, CH3
13CH2CN and CH3CH2C15N have been measured. In addition the spectrum of CH3CH2
13CN has been remeasured with greater accuracy. From these spectra and those previously reported - CH3CH2CN, CH3CD2CN, CH2DCH2CN (sym) and CH2DCH2CN (asym) - a complete rs-structure has been calculated by the equations of Kraitchman and Chutjian. r0-structure calculations were performed with different assumptions due to the symmetry of the molecule. A comparison between r0- and rs-structure was made and showed good agreement especially for the atoms of the frame.
The quadrupole coupling constants of the above mentioned isotopes of ethyl cyanide were obtained from the hyperfine structure of the spectra with the exception of CH3CH2C15N, which has no nucleus with quadrupole moment. The quadrupole coupling tensor in its principal axis system was determined from the constants of CD3CH2CN and CH3CD2CN using the angle e between their principal axes of inertia in the a-b-plane.
From Stark effect measurements the dipole moment of CH3CH2CN was reevaluated. To determine the direction of the dipole moment Stark effect measurements for CD3CH2CN and CH3CD2CN were carried out.
On the Definitions of Characteristic Molecular Vibrations and the Distribution of Vibrational Energy
Authors: Alix Alain J. P. , Freeman Daryl E. , Müller Achim 
Published: February 2015

Abstract
The relationship of the definition of a completely characteristic normal vibration to the stationary properties of force and compliance constants is examined. The corresponding properties of various distributions of potential, kinetic, and total vibrational energy are described.
Einfluß der Strömungsform des Gases auf die chemischen Transportprozesse in Halogenglühlampen
Authors: Neumann Gerhard M. 
Published: February 2015

Abstract
By raising the inert gas pressure and thus changing the type of gas flow chemical transport processes in tubular halogen incandescent lamps may be influenced. At medium pressures in the region of laminar flow separation of halogen and inert gas due to thermodiffusion occurs, the halogen cycle breaks down, and bulb blackening of the lamp is observed. At low and high pressure, where the streaming behaviour of the gas phase is dominated by diffusion or turbulence, separation of halogen and inert gas is overcome and the lamps stay clean. Observed pressures for changing from laminar to turbulent flow are 3.5 atm in xenon, 5.5 atm in krypton, and > 8 atm in argon in good accord with the well-known Reynolds' criterion.
Reflection of Ionized Hydrogen Clusters at Polished Stainless Steel
Authors: Gspann J. , Krieg G. 
Published: February 2015

Abstract
Ionized hydrogen clusters of either charge polarity containing some 105 molecules of hydrogen can be reflected at a polished stainless steel surface, for purposes of fusion fuel injection, very similarly to neutral clusters. The effective charge of positive cluster ions increases by a factor of about 1.5 during the reflection.
Anomalie der elektrischen Leitfähigkeitsanisotropie von 4,4' -Di-n-hexyloxy-azoxybenzol
Authors: Heppke G. , Schneider F. 
Published: February 2015

Abstract
The electric conductivity of 4,4'-di-n-hexyloxyazoxybenzene is studied as a function of temperature for parallel and perpendicular alignment. Below the clearing temperature the ratio of anisotropy V=x||/x⟂ is found to be higher than unity. Its value decreases below unity when approaching the transition to the smectic phase. Increasing the concentration of the electrolyte tetrabutylammonium picrate yields an unexpected increase of the ratio of anisotropy.
Elektrochemische Untersuchung der chemischen Diffusion in Wüstit mit Hilfe eines oxidischen Festelektrolyten/ Electrochemical Investigation of Chemical Diffusion in Wüstite Using a Solid Oxide Electrolyte
Authors: Rickert H. , Weppner W. 
Published: February 2015

Chemical diffusion measurements in wüstite were carried out with the help of the solid state galvanic cell
pO₂, Ptl |ZrO2(+Y2O3)| Fe1 - δ(ϰ)O| Pt2, N2

with doped ZrO2 as a solid electrolyte which exhibits practically pure conduction for oxygen ions. Starting from an initial homogeneous stoichiometry as given by δ, the voltage E of the cell, i. e. the chemical potential of oxygen (or δ) in Fe1 - δO at the phase boundary with the electrolyte, was changed in small steps, corresponding to 3,5 - 15% of the whole stoichiometric range. The re-equilibration of the compound was observed by the current as a function of time. Alternatively, a small constant current was applied to the galvanic cell and the voltage between the wüstite and a reference electrode was measured. From the relaxation behaviour the chemical diffusion coefficient can be determined in several ways. The values are consistent with those calculated from tracer diffusion coefficients, the thermodynamic factor, which could be estimated from coulometric titration measurements, and a correlation factor of the order of 1. In contradiction to previous results with thermogravimetric methods the chemical diffusion coefficient increases with growing deviation from the ideal stoichiometry.
A New Relation between Dissociation Energy and Molecular Constants of Diatomic Molecules
Authors: Bhutra M. P. , Tandon S. P. , Vaishnava P. P. 
Published: February 2015

Abstract
An accurate relation, connecting dissociation energy D0, force constant for infinitesimal amplitude ke and internuclear equilibrium distance re has been deduced from Varshni and Shukla's potential function. It is of the form D0=ke {A + B re
2 + C re
4), where A, B and C are constants and are the same for groups of similar diatomic molecules. The values of D0 estimated by this relation are in better agreement with the observed ones than those estimated by Somayajulu, and Tandon et al.
Electronic Density of States of Noncrystalline Si and Ge: I. Spherically Symmetric Interference Function Approach
Authors: Haider N. C. , Wourms R. L. 
Published: February 2015

Abstract
The electronic density of states have been calculated for amorphous and liquid phases of Si and Ge, using pseudopotential perturbation theory. These calculations are carried out on the basis of experimental radial distribution functions for the appropriate phases, and second order in electron energy. The density of states generated by this method compare favorably with those obtained by other computational methods.
Dielectric Constants and Molecular Structure of Nematic Liquid CrystalsII. Variation of the Bridging Group
Authors: Jeu W. H. de , Lathouwers Th. W. 
Published: February 2015

Abstract
Measurements are presented of the dielectric constants of some nematic compounds with the structure

The following bridging groups X are considered: C ≡ C, CH = CH, CCl = CH, N = N, CH = N, N = CH, CO - O and O -CO. Starting from the compounds with non-polar bridging groups the influence of the group X on the dielectric properties is systematically evaluated.
Condensation and Evaporation of a Dilute Vapour on a Spherical Droplet
Authors: Williams M. M. R. 
Published: February 2015

Abstract
The behaviour of a dilute vapour, diffusing in a non-condensable gas, has been investigated. The vapour condenses on, and evaporates from, a spherical droplet, and the appropriate Boltzmann equation has been formulated thus enabling the condensation rate to be calculated in a precise manner. In contrast to previous work on this problem, the saturation temperature of the droplet differs from that of the non-condensable gas and this leads to certain differences and difficulties in the calculations. Despite these difficulties, an approximate method has been developed which uses the integral form of the transport equation to express the condensation rate in a form which includes any type of vapour-gas interaction. This is an advance on previous work which was confined to simple model problems and restricted to isotropic scattering. An expression for the heat flux to the droplet is obtained and a method for calculating the vapour density and temperature is outlined. Finally, we stress the limitations of the method and suggest ways in which these may be overcome.
Stark Broadening of A III and AIV Lines
Authors: Platiša M. , Popović M. , Dimitrijević M. , Konjević N. 
Published: February 2015

Abstract
The half-widths of five A III and two A IV lines have been measured in a pulsed arc operated in an argon-nitrogen mixture. Electron densities of 3.8 to 8.0 × 10 16 cm-3 were determined by laser interferometry at a single wavelength while electron temperatures from 20750° to 23100 °K were measured from the relative intensities of All lines. The experimental A III and A IV Stark profile halfwidths were compared with calculated values using various theoretical approximations.
Isotopeneffekt und Druckkoeffizient der Übergangstemperatur zur Supraleitung in der Eliashberg-Theorie / Isotope Effect and Pressure Coefficient of the Superconducting Transition Temperature within the Eliashberg-Theory
Authors: Kessel W. 
Published: February 2015

Abstract
Isotope Effect and Pressure Coefficient of the Superconducting Transition Temperature within the Eliashberg-Theory Starting from the observation that both the mass of the ions and their volume control the phonon frequencies by stretching the phonon spectrum, the change of the Eliashberg-equations of the theory of superconductivity regarding these stretchings is considered. General expressions for the isotopic exponent and the pressure coefficient of the transition temperature are derived in which only derivatives of the transition temperature with respect to the fundamental parameters of the theory are involved. A comparison with experimental values shows that lead is not the metal with the highest transition temperature possible under the simple metals.
Cayley-Zahlen und Erhaltungsgesetze für Elementarteilchen / Cayley Number and Conservation Laws for Elementary Particles
Authors: Vollendorf F. 
Published: February 2015

Abstract
It is shown that the five conservation laws of charge, hyper-charge, barion number and the two lepton numbers lead to the construction of a commutative non-associative 24 dimensional linear algebra. Each element of the algebra is an ordered set of three Cayley numbers.
Resonance Broadening and Oscillator strength of the Mercury Absorption Line 1850 Å
Authors: Gebhard D. , Behmenburg W. 
Published: February 2015

Abstract
A new method for the determination of f-values of resonance transitions from wing-measurements of selfbroadened resonance absorption lines is described. The method is applied to the mercury resonance transition 61 S0→61P1, λ 1850 Å. The resulting f-value of 1.08±0.05 agrees well with those obtained from other methods.
Der Einfluß magnetischer Felder auf die Torsionsscherung von MBBA / Torsional Shear Flow of MBBA in Magnetic Fields
Authors: Waltermann Th. , Fischer F. 
Published: February 2015

Abstract
Quantitative results are reported on the influence of a homogeneous magnetic field upon the torsional shear flow of a homeotropic layer at 22.5 °C. In subcritical fields Hx parallel to the layer, as well as in weak fields Hz normal to the layer, one gets K3/μ0 Xa = 3.76±0.2 A2 . In oblique magnetic fields (Hx , 0, Hz) one obtains (λ2-λ1)/μ0 Xa=(11.7±0.4)x1010 A2 m-2 s. In addition, a hysteresis effect in supercritical fields Hx and the formation of a long and straight magnetic wall are described. The magnetic wall becomes distorted under the action of the shear flow. Hereby a new domain can be produced which has a 180° inversion wall parallel to the boundaries of the layer.
Enrichment of 14CH4 by Thermal Diffusion for Use in Radiocarbon Dating
Authors: Kretner R. , Dickel G. 
Published: February 2015

Abstract
By means of a thermal diffusion column the range of the radiocarbon dating method can be extended by about 20 000 years. In order to calculate suitable dimensions and operation conditions, a theory of nonlinear enrichment is derived. On the basis of a formula which describes the dependence of the enrichment factor on time and the characteristic values of the column, a con-centric column of 11m length was constructed. The enrichment factors obtained for 13 CH4 as a function of time (up to 400 h) and pressure (150 -1500 Torr) and for 14CH4 at 740 Torr and up to 1000 h are presented and discussed. A method is described to indirectly determine the enrichment factor in the stationary state and the characteristic time.
Ein neues Verfahren zur Berechnung der Diffusionskoeffizienten in Multikomponentensystemen aus Meßdaten der quasistationären Diffusion / A new procedure for the determination of diffusion coefficients from quasi-stationary diffusion measurements in multicomponent systems
Authors: Meiske W. , Schmidt W. , Kahrig E. 
Published: February 2015

Abstract
Diffusion in an (n+1) -component system is described by Onsager's flow equations the integration of which leads in the case of quasi-stationarity to the differential equations d(Δc)/dt=-βD̅Δ c (Δc: vector of concentration differences between the compartments of the cell, D̅: matrix of integral diffusion coefficients, β: apparatus constant). Several procedures are known to determine these diffusion coefficients from such equations but all of them have certain disadvantages. In this paper a new method is described to compute the integral diffusion coefficients, which starts from the associated equivalent system of integral equations. The mathematical formalism is simple, and its numerical performance does not become more difficult with an increasing number of components of the system.
On the Calculation of the Force Constants for Halides AX4
n (Td). Using an Empirical Constraint F33 (F2)/F11 (A1) = Constant for Similar Molecules and Ions
Authors: Alix A. , Cerf C. , Rai S. N. 
Published: February 2015

Abstract
An empirical constraint for the determination of the force constants of a General Valence Force Field for the tetrahedral halides with the general formula AX4
n (where A = an element of the groupe II, III, IV, V and VI; X = F, Cl, Br and I and n = +1, 0, -1 and -2) is presented. The model is defined by a constant value of the parameter p= (ft -ftt) / (ft + 3ftt). The optimum value, p = 0.73, obtained for the mixed halides of chlorobromomethane is compared with those calculated from other force fields commonly used.