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1985 (209)
61Author    Sikha Bhattacharyya, R.K Roy ChoudhuryRequires cookie*
 Title    Effect of Finite Ion Temperature and Modulational Instability of Ion-Acoustic Waves in Presence of an Inhomogeneous Plasma  
 Abstract    Using an extended version of K. B. M. method we have investigated the effect of finite ion tem-perature on ion-acoustic solitary waves. Modulational instability has been discussed in a frame work of nonlinear Schrödinger equation. Some numerical results are also given. 
  Reference    Z. Naturforsch. 40a, 421—424 (1985); received March 7 1984 
  Published    1985 
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 TEI-XML for    default:Reihe_A/40/ZNA-1985-40a-0421.pdf 
 Identifier    ZNA-1985-40a-0421 
 Volume    40 
62Author    L. J. Gallego, J. A. Alonso, J. A. SomozaRequires cookie*
 Title    Concentration Fluctuations in Liquid Alloys of Alkali Metals from Semiempirical Theories of Mixtures  
 Abstract    The semiempirical theories of mixtures developed by van Laar, Margules, Scatchard-Hamer, Wilson and Renon and Prausnitz are used to study the concentration fluctuations of binary liquid alloys formed among the alkali metals. Examination of the fitting capabilities of these theories leads to the conclusion that those of van Laar, Scatchard-Hamer and Renon and Prausnitz are appropriate both when the atomic sizes of the component metals are similar and when there is considerable atomic size mismatch. The Margules and Wilson theories, on the contrary, appear to be restricted only to cases in which the size difference between the two types of atoms is small. 
  Reference    Z. Naturforsch. 40a, 425—429 (1985); received December 1 1984 
  Published    1985 
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 TEI-XML for    default:Reihe_A/40/ZNA-1985-40a-0425.pdf 
 Identifier    ZNA-1985-40a-0425 
 Volume    40 
63Author    G. Schmelzeisen-Redeker, S. S. Wong, U. Giessmann, F. W. RöllgenRequires cookie*
 Title    Thermospray Mass Spectrometry , a New Technique for Studying the Relative Stability of Cluster Ions of Salts  
 Abstract    Thermospray (TSP) mass spectrometry provides a means of studying stability effects in the frequency distribution of cluster ions of salts under conditions of heat transfer to the cluster ions via thermal collisions in a gas. This is demon-strated for the cluster ions of ammonium chloride. The TSP mass spectrum is compared with that obtained by sputtering of the salt in secondary ion mass spectrometry. 
  Reference    Z. Naturforsch. 40a, 430—431 (1985); received February 23. 1985 
  Published    1985 
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 TEI-XML for    default:Reihe_A/40/ZNA-1985-40a-0430_n.pdf 
 Identifier    ZNA-1985-40a-0430_n 
 Volume    40 
64Author    R. Duscher, J. K. MaichleRequires cookie*
 Title    Electronic Structure of a Single Hydrogen Centre in Magnesium Crystals  
 Abstract    In the present work, the problem "hydrogen storage in metals" is treated with the aid of the so-called NewTamm-Dancoff (NTD) procedure. We employ this method in lowest approxima-tion for the evaluation of the electronic energy difference eigenvalue between a metal crystal with and without hydrogen centre. As an example we use Magnesium with hexagonal structure. For this system we calculate the difference eigenvalue with dependence on the displacement of the nearest neighbours and next nearest neighbours of the hydrogen centre, respectively. Finally we calculate the radial electron density distribution in the environment of the proton. 
  Reference    Z. Naturforsch. 40a, 433—438 (1985); received February 12 1985 
  Published    1985 
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 TEI-XML for    default:Reihe_A/40/ZNA-1985-40a-0433.pdf 
 Identifier    ZNA-1985-40a-0433 
 Volume    40 
65Author    B. Bratschek, B. Rager, H.-J VolkertRequires cookie*
 Title    Lattice Statics of a Hydrogen Centre in Magnesium  
 Abstract    In this work we consider the static perturbation of the hexagonal lattice of magnesium by one stored hydrogen atom. Equations are given to evaluate the equilibrium positions of the ions in the disturbed crystal. The effect of the hydrogen atom is described by a so-called Kanzaki force, an additional force in the ideal lattice. The force between two ions of the ideal lattice is assumed to obey the harmonic approximation. The force constants are calculated form an effective ion-ion potential. The static Green tensor, which is the inverse of the tensor of force constants, is calculated and with its aid the equations of lattice statics are transformed. The transformed equations are solved under the assumption of a Kanzaki force acting only upon the nearest and next-nearest neighbors of the hydrogen atom at a tetrahedral interstitial site. Finally we calculate the volume change A Fand compare the result with the experimental value. 
  Reference    Z. Naturforsch. 40a, 439—449 (1985); received February 12 1985 
  Published    1985 
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 TEI-XML for    default:Reihe_A/40/ZNA-1985-40a-0439.pdf 
 Identifier    ZNA-1985-40a-0439 
 Volume    40 
66Author    Jiben Sidhanta, Rajkumar RoychoudhuryRequires cookie*
 Title    Asymptotic Freedom and QCD Scaling Law  
 Abstract    We present a derivation of the QCD scaling law on the basis of asymptotic freedom The pioneering investigations [1, 2] in QCD scal-ing laws were marked by an instructive combination of the techniques of "light cone and renormalization group" (hereafter called LC-RG). The resulting structure function formulas worked quite well for large .v but small x posed one serious analytical problem during "inversion". Yet, it was these very works that made the asymptotically free gauge theory suitable for experimental test. Another re-markable development followed when the so-called "anomalous dimension" occuring in the moment equation of the preceding papers was related to the Mellin Transform of the quark distribution. The resulting equation [3] came to be known as the QCD master equation. 
  Reference    Z. Naturforsch. 40a, 450—452 (1985); received November 19 1984 
  Published    1985 
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 TEI-XML for    default:Reihe_A/40/ZNA-1985-40a-0450.pdf 
 Identifier    ZNA-1985-40a-0450 
 Volume    40 
67Author    Barnana Roy, Ghosh)., RajkumarRoy ChoudhuryRequires cookie*
 Title    Group Theoretic Approach to the Exponential Cosine Screened Coulomb Potential  
 Abstract    Perturbation method, using the properties of SO (2,1) algebra is applied to get a simple analytical formula for energy eigenvalues of the exponential cosine screened Coulomb potential. 
  Reference    Z. Naturforsch. 40a, 453—455 (1985); received December 17 1984 
  Published    1985 
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 TEI-XML for    default:Reihe_A/40/ZNA-1985-40a-0453.pdf 
 Identifier    ZNA-1985-40a-0453 
 Volume    40 
68Author    M. BörnerRequires cookie*
 Title    Quantelung der Zeit und Quantenmechanik  
 Abstract    Time Quantization and Quantum Mechanics If the universe as a whole can be described as an ordered succession of discrete (Eigen-)states, the parameter of this order, a number t (tel.) plays the role of a quantizised time. Then a particle (with mass m) as a substructure of the universe no longer follows a classical equation of motion with the moment p and the position ;c. The functional connection between these two quantities is rather a distribution. Especially there no longer exists the classical union of differen-tial equation-initial conditions-path. The path is now only understandable as average, introduc-ing a continuously running time. A central part for finding p and x as such averages, is played by the expectation values of these new quantities. Since the expectation values depend on all discrete points x(t) (-oo ^ t^ + oo), we find sumrelations, which we can approximate by integrals. The integration extends over all d.v resp. dp-elements, which are loaded with the proba-bility of their appearance. Following this procedure p and x become operators. If we postulate p and x to fulfil Newtons law, we find the y/ x and y/ p functions, constituting the resp. probability densities, to be governed by Shroedingers equation. The necessary existence of a quantum mechanics can thus be a reference to the existence of a noncontinuous time. 
  Reference    Z. Naturforsch. 40a, 456—461 (1985); eingegangen am 19. Februar 1985* 
  Published    1985 
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 TEI-XML for    default:Reihe_A/40/ZNA-1985-40a-0456.pdf 
 Identifier    ZNA-1985-40a-0456 
 Volume    40 
69Author    ErnstF. HefterRequires cookie*
 Title    The Energy Dependence of the Imaginary Nuclear Potential  
 Abstract    Recently the inverse mean field method (Imefim) has been shown to lead to a specific energy dependence of the real central nuclear part, V, of the optical model potential for nucleon-nucleus scattering. Proceeding from V towards the imaginary volume term of the potential, W v , application of conservation laws yields a specific energy dependence for W v . It compares favourably with heuristic potentials. 
  Reference    Z. Naturforsch. 40a, 462—465 (1985); received February 19 1985 
  Published    1985 
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 TEI-XML for    default:Reihe_A/40/ZNA-1985-40a-0462.pdf 
 Identifier    ZNA-1985-40a-0462 
 Volume    40 
70Author    N.V S Rao, V.G K M PisipatiRequires cookie*
 Title    Smectic C to Nematic Phase Transition Studies in NOBA  
 Abstract    The variation of density g with temperature of p-n-nonyloxy benzoic acid in its isotropic, nematic and smectic-C phases is presented. The density jumps and the computed thermal expansion coefficient maxima suggest the order of the N-S c and N-I transitions to be first order. The pressure dependence of the transition temperatures as computed from the Clausius-Clapeyron equation and the presence of pretransitional effects at the N-S c and N-I transitions in the nematic phase are discussed. 
  Reference    Z. Naturforsch. 40a, 466—468 (1985); received July 10 1984 
  Published    1985 
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 TEI-XML for    default:Reihe_A/40/ZNA-1985-40a-0466.pdf 
 Identifier    ZNA-1985-40a-0466 
 Volume    40 
71Author    N.V S Rao, V.G K M Pisipati, P. V. Datta, Prasad, D. SaranRequires cookie*
 Title    ESR Study of Molecular Ordering in 50.1,50.2 and 50.4  
 Abstract    An ESR study of the liquid crystals N(p-n-pentyloxy benzylidene) p-n-alkylanilines [alkyl = methyl, 50.1; ethyl, 50.2; butyl, 50.4] has been carried out using a nitroxide radical as paramagnetic probe. The order parameters determined in this way are in close agreement with those determined from refractive indices by the Neugebauer method. 
  Reference    Z. Naturforsch. 40a, 469—471 (1985); received November 24 1984 
  Published    1985 
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 TEI-XML for    default:Reihe_A/40/ZNA-1985-40a-0469.pdf 
 Identifier    ZNA-1985-40a-0469 
 Volume    40 
72Author    V.G K M Pisipati, N.V S Rao, P. V. Datta, Prasad, P. R. AlapatiRequires cookie*
 Title    Density, Refractive Index and Ultrasonic Velocity Studies Involving N-(p-n-Pentyloxybenzylidene)-p-n-octylaniline  
 Abstract    The density, refractive index and ultrasonic velocity dependence on temperature for N-(p-n-pentyloxybenzylidene)-p-n-octylaniline, 50.8, is presented. The compound 50.8 exhibits smectic-B, smectic-Ä and nematic phases between the solid and isotropic liquid phases. The nematic-iso-tropic and smectic A-smectic B phase transformations are found to be first order. The interesting smectic A — nematic transformation is confirmed from the results to be second order, although the thermal expansion coefficient and reported enthalpy data had suggested a weak first order transition. The computed adiabatic compressibility, /? ad , molar sound velocity, R n , and molar compressibility A w are presented. 
  Reference    Z. Naturforsch. 40a, 472—475 (1985); received July 27 1984 
  Published    1985 
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 TEI-XML for    default:Reihe_A/40/ZNA-1985-40a-0472.pdf 
 Identifier    ZNA-1985-40a-0472 
 Volume    40 
73Author    K.M T Yamada, G. WinnewisserRequires cookie*
 Title    Analysis of "Hot" Bands Associating to the V2 Fundamental Band of HC 5 N  
 Abstract    The v 2 fundamental band of cyanobutadiyne, HC 5 N, is accompanied by a number of strong hot bands arising from the low energy bending exicted states. We have assigned and analyzed the hot band from the t n = 1, 2, and 3 states and the i' 10 = 1 state. The /-type doubling effect has been observed in the hot band of v u = 1, while the hot band of v\n= 1 did not show the splitting. The diode laser spectra were recorded between 2250 and 2260 cm"'. 
  Reference    Z. Naturforsch. 40a, 476—478 (1985); received March 6 1985 
  Published    1985 
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 TEI-XML for    default:Reihe_A/40/ZNA-1985-40a-0476.pdf 
 Identifier    ZNA-1985-40a-0476 
 Volume    40 
74Author    B. Grosser, E. MenzelRequires cookie*
 Title    Surface Analysis and Structures Spherical Crystals of Very Clean Au, Cu and Au-Cu Alloys Grown from a Drop of Melt  
 Abstract    Surface impurities on spherical Au and Cu crystals grown from a drop of melt on graphite in UHV were analyzed by Auger electron spectroscopy after the metals had been cleaned by melting resp. roasting in air. Crystals of Au-Cu alloys grown by the same technique show enrich-ment of the less abundant component. The well known reconstructions Au(001)(5x20) and Au(l 1 l)(23x 1) could not be detected by RHEED and LEED on cleaned Au crystals. But both structures were confirmed on crystals of Au + 45 at ppm Cu. Au(l 10)(1 x2) was present on cleaned and weakly Cu alloyed Au crystals. 
  Reference    Z. Naturforsch. 40a, 479—484 (1985); received February 23 1985 
  Published    1985 
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 TEI-XML for    default:Reihe_A/40/ZNA-1985-40a-0479.pdf 
 Identifier    ZNA-1985-40a-0479 
 Volume    40 
75Author    Toshiatsu Oda, Utaro FurukaneRequires cookie*
 Title    Numerical Investigation of Laser Oscillation in a Recombining Hydrogen Plasma Interacting with Helium Gas in TPD-I  
 Abstract    A numerical investigation on the basis of a collisional-radiative (CR) model has shown that laser oscillation between the levels with the principal quantum numbers ; = 2 and 3 can be generated in a recombining hydrogen plasma interacting with a dense helium gas as a cooling medium in TPD-I, which is a magnetically confined quiescent high-density plasma source con-sisting basically of two parts, namely, the discharge region with the cathode at the center of the cusped magnetic field and the plasma column region with the axial magnetic field. The population inversion is found to exceed significantly a threshold level for the laser oscillation even in the quasi-steady state when the hydrogen plasma with n t = 10 13 ~ 10 14 cm~ 3 interacts with the helium gas with a pressure of about 50 Torr. 
  Reference    Z. Naturforsch. 40a, 485—489 (1985); received January 29 1985 
  Published    1985 
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 TEI-XML for    default:Reihe_A/40/ZNA-1985-40a-0485.pdf 
 Identifier    ZNA-1985-40a-0485 
 Volume    40 
76Author    Toshio Yamaguchi, Yusuke Tamura, Isao Okada, Hitoshi Ohtaki, Masakatsu Misawa, Noboru WatanabeRequires cookie*
 Title    The Structure of Some Univalent Metal Nitrate Melts Studied by Means of Pulsed Neutron Diffraction  
 Abstract    The structure factors of molten LiN0 3 , RbN0 3 and AgN0 3 and the 1:1 LiN0 3 -RbN0 3 mix-ture have been determined over a wide range of momentum transfer by neutron total scattering measurements using a pulsed spallation neutron source. Least-squares analyses applied to the intra-ionic part of the structure factors have revealed the geometry of nitrate ions to be equilateral triangular (the D 3h symmetry) in the melts, independent of the cations involved. The radial distribution function (RDF) of the AgN0 3 melt has indicated that about four nitrate ions are bound to an Ag + ion as a monodentate ligand with the shortest Ag-O distance of 240 pm. The contact between lithium atoms and nitrate ions was also evidenced at about 190 pm in the RDF of the melts containing lithium ions, but the orientation of the nitrate toward lithium ions was not conclusive in the present study. 
  Reference    Z. Naturforsch. 40a, 490—496 (1985); received January 23 1985 
  Published    1985 
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 TEI-XML for    default:Reihe_A/40/ZNA-1985-40a-0490.pdf 
 Identifier    ZNA-1985-40a-0490 
 Volume    40 
77Author    Maximilian ZanderRequires cookie*
 Title    Zur Photolumineszenz von Benzologen des Thiophens  
 Abstract    On the Photoluminescence of Thiophene Benzologues Fluorescence and phosphorescence spectra, fluorescence and phosphorescence quantum yields and phosphorescence lifetimes of the benzologues I-V of thiophene have been measured in ethanol at 77 K. By comparing the energies of the lowest triplet states of the molecules with those of corresponding hydrocarbons it is concluded that the sulphur atoms act like substituents and are not equivalent to aromatic double bonds. The rate of the radiationless deactivation of the lowest triplet state depends on the energy gap zl£(7", -S 0) in accordance with the Siebrand relation. An unexpected small intraannullar heavy-atom effect of the sulphur is observed in 2,2'-bis-benzo[b]thienyl (II), a strongly fluorescing compound. As the most likely explanation it is concluded from experiments that in II the interaction between the heavy-atom and the rc-MO's of the hydrocarbon fragment (1,4-biphenylbutadiene) is much smaller compared to that in other structurally related benzologues of thiophene. External heavy-atom perturbers (AgC10 4 , CH 3 J) have a strong influence on the vibronic structure of the phosphorescence spectrum of IV. 
  Reference    Z. Naturforsch. 40a, 497—502 (1985); eingegangen am 1. März 1985 
  Published    1985 
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 TEI-XML for    default:Reihe_A/40/ZNA-1985-40a-0497.pdf 
 Identifier    ZNA-1985-40a-0497 
 Volume    40 
78Author    R. Braun, R. Otto, W. Wischert, S. Kemmler-SackRequires cookie*
 Title    Kathodolumineszenz der Seltenerd-aktivierten Wirtsgitter Sr 3 La2W 2 0 12 und Ca 2 La 0 ^Na 0 ^WO 6  
 Abstract    Cathodoluminescence of the Rare Earth Activated Host Lattices Sr 3 La2W 2 0|2 and Ca2Lao.5Nao.5WOg By activation of the host lattices Sr 3 La2W20 12 and Ca2Lao. 5 Nao. 5 W0 6 with the trivalent rare earth ions Ln 3+ = Pr, Sm, Eu, Tb, Dy, Ho, Er a cathodoluminescence in the visible region is ob-tained. The influence of the electronic structure and concentration of the activator on the relative emission efficiency as well as the host lattice participation in the energy transfer processes are discussed. 
  Reference    Z. Naturforsch. 40a, 503—507 (1985); eingegangen am 12. Februar 1985 
  Published    1985 
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 TEI-XML for    default:Reihe_A/40/ZNA-1985-40a-0503.pdf 
 Identifier    ZNA-1985-40a-0503 
 Volume    40 
79Author    G. Bestmann, H. Dreizler, J.M D Vacherand, B P Boucher, J. Van Eijck, DemaisonRequires cookie*
 Title    The Rotational Spectrum of Propane Centrifugal Distortion Analysis  
 Abstract    The ground state rotational spectrum of propane has been investigated between 6.4 and 26.5 GHz with a microwave Fourier transform spectrometer and between 140 and 300 GHz with a millimeter-wave spectrometer. High J transitions have been measured and fitted to a centrifugal-ly distorted Hamiltonian including some sextic coefficients. The results of the analysis are sufficiently accurate for the prediction of all strong transitions of astrophysical interest. 
  Reference    Z. Naturforsch. 40a, 508—510 (1985); received February 18 1985 
  Published    1985 
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 Identifier    ZNA-1985-40a-0508 
 Volume    40 
80Author    G. Elbers, G. LehmannRequires cookie*
 Title    Electron Paramagnetic Resonance and Optical Absorption Spectra of V0 2+ in CsCl Single Crystals  
 Abstract    In vanadium-doped CsCl crystals grown from aqueous solutions anisotropic EPR spectra due to V0 2+ are observed and analyzed at room temperature. Evidence is presented that isotropic spectra of this ion observed in this and other compounds are due to inclusions of growth solution and not to rapid rotation of the vanadyl ion in the solid as normally assumed. At 77 K a well resolved vibrational progression of about 820 cm -1 is observed in the first ligand field band of this ion. The optical absorption spectra indicate the presence of a second valence state of vanadium, most likely V 3+ , in varying proportions depending on the crystal growth temperature. 
  Reference    Z. Naturforsch. 40a, 511—515 (1985); received February 22 1985 
  Published    1985 
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 TEI-XML for    default:Reihe_A/40/ZNA-1985-40a-0511.pdf 
 Identifier    ZNA-1985-40a-0511 
 Volume    40 
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