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1978[X]
181Author    Rainer Kimmich, Gerhard VoigtRequires cookie*
 Title      
 Abstract    The effect of diffusing defects such as vacancies, displacements, torsions, and rotational isomers on the nm r and dielectric relaxation behaviour is treated under various aspects. The influences of the dimensionality of the diffusion process, of the mutual hindrance, of the defect concentration, of the defect length and of the mean lifetime are derived and discussed. 
  Reference    Z. Naturforsch. 33a, 1294—1306 (1978); received August 2 1978 
  Published    1978 
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 Identifier    ZNA-1978-33a-1294 
 Volume    33 
182Author    Jerzy Grzywacz, Stanislawa Taszner, Jerzy KruszewskiRequires cookie*
 Title    Further Study on the Forms of Umbelliferone in Excited State  
 Abstract    Absorption and emission spectra of umbelliferone in ethanol-water solution are studied in a wide range of water content. No variations in the absorption spectra were found, whereas the emission spectra proved to be highly sensitive to the volume percentage of water. An inter­ pretation is attempted on the basis of electron density calculations by the SCF P P P Cl method for the molecule of umbelliferone and a hypothetical tautomer. 
  Reference    Z. Naturforsch. 33a, 1307 (1978); received April 13 1978 
  Published    1978 
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 TEI-XML for    default:Reihe_A/33/ZNA-1978-33a-1307.pdf 
 Identifier    ZNA-1978-33a-1307 
 Volume    33 
183Author    S. 0. Ljunggren, P. J. Mjöberg, J. E. BäckvallRequires cookie*
 Title    Microwave Spectrum of 1-Butene Oxide  
 Abstract    The microwave spectrum of 1-butene oxide in the gas phase has been studied in the frequency region 18.0—39.0 GHz. The spectrum observed arose from a rotamer with a dihedral H-C2-C3-C4 angle of 59° ± 1°. In addition to several ^-branch progressions the spectrum contained several long perpendicular RP and PR progressions. However, of the ground state lines, only the inter­ mediate PR transitions showed internal rotation splittings that could be resolved to yield a barrier height of 3.02 kcal mol-1. The value derived from the line splittings of the first excited methyl torsional state was slightly higher (3.17 kcal mol-1) but must be regarded as being less reliable. The components of the dipole moment, the rotational constants, and the quartic and sextic centrifugal distortion coefficients for the ground state and three vibrationally excited states were determined. 
  Reference    Z. Naturforsch. 33a, 1312 (1978); received Ju ly 18 1978 
  Published    1978 
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 Identifier    ZNA-1978-33a-1312 
 Volume    33 
184Author    Manfred Winnewisser, Jürgen VogtRequires cookie*
 Title    /-Type Doublet Transitions of the Rare Stable Isotopic Species of Hydrogen Cyanide, H C N  
 Abstract    /-type doublet transitions for HCN molecules in the first excited bending state 0110 have been measured for the isotopic species H 13C14N, H 12C15N, H 13C15N, D 13C14N, D 12C15N and D 13C15N. The measurements improve and complete the set of available coupling constants of the vibration-rotation interaction in this bending mode. All known Z-type coupling constants are collected and compared with those obtained from the Z-type splitting of the rotational lines and those obtained from ab-initio calculation of the energy hypersurface. 
  Reference    Z. Naturforsch. 33a, 1323—1327 (1978); received August 26 1978 
  Published    1978 
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 TEI-XML for    default:Reihe_A/33/ZNA-1978-33a-1323.pdf 
 Identifier    ZNA-1978-33a-1323 
 Volume    33 
185Author    S. Schmidt, G. SickingRequires cookie*
 Title    Solubility Isotherms of Tritium in Palladium at Low Equilibrium Pressures  
 Abstract    The solubility of tritium at low pressures in bulk palladium was analysed again. The gas-volumetric method used, working with only 2 cm3 stp tritium gas, is described. The Sieverts constants obtained obey the following relationship: In K s = — 832/71 + 6.243. 
  Reference    Z. Naturforsch. 33a, 1328 (1978); received August 17 1978 
  Published    1978 
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 TEI-XML for    default:Reihe_A/33/ZNA-1978-33a-1328.pdf 
 Identifier    ZNA-1978-33a-1328 
 Volume    33 
186Author    B. M. LandsbergRequires cookie*
 Title      
 Abstract    The microwave spectrum of methyl selenocyanate has been observed for the isotopic species 12CH380Se12C14N, 12CH378Se12C14N, i 2CH377Sei2C i4N, i 2CH376Sei2Ci4N, i 2CH382Sei2C14N, 13CH380Se12C14N and i 3CH378Sei2C14N. For the main isotopic species, a full centrifugal distortion analysis is reported and internal rotation splittings have been analysed for the ground and first excited torsional states, and also for the t'io = 1 and v\ q = 2 excited vibrational states. A structure based on a mixture of rs and ro arguments is reported, and also the principal components of the dipole moments. 
  Reference    Z. Naturforsch. 33a, 1333—1340 (1978); received April 8 1978 
  Published    1978 
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 TEI-XML for    default:Reihe_A/33/ZNA-1978-33a-1333.pdf 
 Identifier    ZNA-1978-33a-1333 
 Volume    33 
187Author    B. Denzel, F. F. SeeligRequires cookie*
 Title    Calculation of Separatrices in Multistable Chemical Reaction Systems  
 Abstract    In multistable chemical reaction systems the space of variables is partitioned by separatrices into different cells which are the domains of attraction of the respective critical points. By numerically solving an initial value problem, which is based on the particular stability proper­ ties of separatrix manifolds, we achieve a direct approximation of the stability boundaries in the phase space. The method is principally applicable to nonlinear systems of any number of variables and, other than the direct method of Liapunov, also in regions of the phase space which are far from the critical points. 
  Reference    Z. Naturforsch. 33a, 1341 (1978); received September 9 1978 
  Published    1978 
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 TEI-XML for    default:Reihe_A/33/ZNA-1978-33a-1341.pdf 
 Identifier    ZNA-1978-33a-1341 
 Volume    33 
188Author    R. GrünbergRequires cookie*
 Title    Anlagerung von Elektronen in Luft und in Gemischen aus 0 2 mit He, N 2 und C 0 2  
 Abstract    Electron Attachment in Air and Mixtures of O2 with He, N 2 , and C02 The attachment coefficient rj for the formation of negative oxygen ions in low energy electron swarms was measured in dry air and in mixtures of oxygen with helium, nitrogen and carbon dioxide. The shift of the rj/po2-curves of the mixtures against those for pure oxygen are in good agreement with the Bloch-Bradbury theory and can be explained by the influence of the admixted gas on the mean electron energy and the electron energy distribution function. Deviations from the regularity r]/pQ2 = const, described in an earlier paper have been followed up in air at higher pressure and in 02-C02-mixtures with a high share of CO2. 
  Reference    Z. Naturforsch. 33a, 1346—1360 (1978); eingegangen am 19. August 1978 
  Published    1978 
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 TEI-XML for    default:Reihe_A/33/ZNA-1978-33a-1346.pdf 
 Identifier    ZNA-1978-33a-1346 
 Volume    33 
189Author    E. Plies, D. TypkeRequires cookie*
 Title    Dreidimensional abbildende Elektronenmikroskope II. Theorie elektronenoptischer Systeme mit gekrümmter Achse Three-dimensionally Imaging Electron Microscopes I I . Theory of Electron-optical Systems with a Curved Axis  
 Abstract    An imaging and aberration theory of electron-or ion-optical systems composed of arbitrary stationary electromagnetic fields without space charges and currents in the beam-occupied region is developed. I t follows the theory of systems with a straight optical axis as formulated by H. Rose. The electromagnetic field is expanded into plane multipoles about the arbitrarily curved and twisted axis. In the expansion of the eikonal, all terms are given which are needed for the calculation of the image aberrations up to the third rank (rank = Seidelian order -| -power of disturbing potentials + power of the chromatic deviation). For the image aberrations of the second rank, an integral expression is given, from which the single aberration integrals may be derived. Systems with single-section symmetry are treated in more detail. 
  Reference    Z. Naturforsch. 33a, 1361 (1978); eingegangen am 6. August 1978 
  Published    1978 
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 TEI-XML for    default:Reihe_A/33/ZNA-1978-33a-1361.pdf 
 Identifier    ZNA-1978-33a-1361 
 Volume    33 
190Author    V. K. JaRequires cookie*
 Title    EPR of Gd3+ in Hydrated Double Nitrate Single Crystals  
 Abstract    EPR o f Gd3+ in Sm2Zn3(N0 3)i2 * 24 H2O and P r2Mg3(NC>3)i2 • 24 H2O single crystals has been studied a t X-band. In addition to the allowed fine structure lines (A M — ± 1) some weak low field lines identified as A M = ; t 2 transitions, have been observed. 
  Reference    Z. Naturforsch. 33a, 1389 (1978); received June 3 1978 
  Published    1978 
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 TEI-XML for    default:Reihe_A/33/ZNA-1978-33a-1389_n.pdf 
 Identifier    ZNA-1978-33a-1389_n 
 Volume    33 
191Author    J.A M S DuarteRequires cookie*
 Title    The Non-linear Relation between Average Size and Perimeter of Lattice Animals  
 Abstract    For (s}t > the average number of sites in two dimensional cluster configurations ("lattice animals") with a fixed pe­ rimeter t, an asymptotic dependence of the form (s}t « t312 is found. This dependence, for which a scaling theory is still missing, is particularly accurate for the triangular lattice when t is measured by the number of broken bonds. Owing to their importance fo r the study of site percolation processes by the perimeter method, doubly-indexed partitions of percolation clusters, gst are well-known (Essam [1 ] , Sykes et al. [2 ]). One 
  Reference    Z. Naturforsch. 33a, 1404 (1978); received August 11 1978 
  Published    1978 
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 Identifier    ZNA-1978-33a-1404_n 
 Volume    33 
192Author    A. RieckersRequires cookie*
 Title    Composite System Approach to Thermodynamic Stability  
 Abstract    The theory of thermodynamic stability is worked out in terms of composite systems starting from basic principles formulated partially in operational language. In this connection a macro­ scopic ordering concept is introduced, and entropy is characterized as numerical measure for the degree of disorder. Various aspects of thermodynamic stability are investigated in operational and analytical terms laying special emphasis on appropriate neighbourhood sets. Some implica­ tions of metastability and neutral stability for the thermodynamic system concept are pursued. 
  Reference    Z. Naturforsch. 33a, 1406—1421 (1978); received September 9 1978 
  Published    1978 
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 TEI-XML for    default:Reihe_A/33/ZNA-1978-33a-1406.pdf 
 Identifier    ZNA-1978-33a-1406 
 Volume    33 
193Author    Ulrich Weinert, Klaus-Achim Kratzsch, Heinz-Rüdiger OberhageRequires cookie*
 Title    On the Evaluation of Transport Collision Frequencies I. The Integration of Empirical Data  
 Abstract    The computation of the transport collision frequencies is discussed, provided the transfer cross sections are given at least for a discrete set of relative kinetic energies. Numerical investigations show that the most satisfying results are achieved by the use of rational interpolation of the transfer cross sections. 
  Reference    Z. Naturforsch. 33a, 1423—1427 (1978); received Ju ly 24 1978 
  Published    1978 
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 TEI-XML for    default:Reihe_A/33/ZNA-1978-33a-1423.pdf 
 Identifier    ZNA-1978-33a-1423 
 Volume    33 
194Author    UlrichW. EinertRequires cookie*
 Title    On the Evaluation of Transport Collision Frequencies II. An Approximating Method to Express the Temperature Dependence  
 Abstract    The temperature dependence of the transport collision frequencies is discussed, provided they are given for one special reference temperature. An approximative procedure to express this dependence is elaborated using the definition of the transport collision frequencies as expansion coefficients. 
  Reference    Z. Naturforsch. 33a, 1428—1431 (1978); received Ju ly 24 1978 
  Published    1978 
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 TEI-XML for    default:Reihe_A/33/ZNA-1978-33a-1428.pdf 
 Identifier    ZNA-1978-33a-1428 
 Volume    33 
195Author    W. TreimerRequires cookie*
 Title    General Formulation of the (111,111) Neutron Three Beam Case  
 Abstract    A formalism developed in a previous paper [1] is now applied in a general way to the special three beam case (111, 111). The restriction for the incoming wave to be located in the symmetry plane is abolished. The individual behavior of the dispersion surfaces and reflection curves are determined and discussed. 
  Reference    Z. Naturforsch. 33a, 1432 (1978); received October 18 1978 
  Published    1978 
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 TEI-XML for    default:Reihe_A/33/ZNA-1978-33a-1432.pdf 
 Identifier    ZNA-1978-33a-1432 
 Volume    33 
196Author    E. BorieRequires cookie*
 Title    Tables of Radiative Corrections to Pion Nucleon and Nucleon-Nucleon Scattering  
 Abstract    The importance of radiative corrections to hadron scattering is discussed, and the relevant formulas presented in a somewhat simpler form than has been given previously. Tables are given to enable the experimentalist to estimate the numerical importance of the corrections, or evaluate them by interpolation. 
  Reference    Z. Naturforsch. 33a, 1436 (1978); received September 23 1978 
  Published    1978 
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 TEI-XML for    default:Reihe_A/33/ZNA-1978-33a-1436.pdf 
 Identifier    ZNA-1978-33a-1436 
 Volume    33 
197Author    G. Glomski, B. Heinrich, H. SchlüterRequires cookie*
 Title    Leistungseinkopplung in ein Plasma erhöhter Elektronentemperatur bei der unteren Hybridresonanz Power Transfer to a Plasma of Elevated Electron Temperature Near the Lower Hybrid Resonance  
 Abstract    Previous investigations of lower hybrid resonant coupling to plasmas of low collision fre­ quencies and elevated electron temperature are extended to cover a range of some mW to 1500 W of reactive power. Though resonant behaviour is observed throughout, the efficiency of power transfer is lowered when a threshold at about 1 W att of reactive power is surpassed. Moreover there is a limited decrease of electron density. Fur high powers saturation in the drop of transfer efficiency is observed. 
  Reference    Z. Naturforsch. 33a, 1447—1451 (1978); eingegangen am 2. Oktober 1978 
  Published    1978 
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 TEI-XML for    default:Reihe_A/33/ZNA-1978-33a-1447.pdf 
 Identifier    ZNA-1978-33a-1447 
 Volume    33 
198Author    S.A El Wakil, H. M. Machali, E. A. SaadRequires cookie*
 Title    Neutron Slowing D ow n with Inelastic Scattering  
 Abstract    The neutron slowing-down equation in an infinite homogeneous medium with isotropic scatter­ ing is solved. The slowing-down kernel is separated into an elastic and an inelastic part. The col­ lision density is expressed in terms of Green's function of the elastic scattering only. The Greuling-Goertzel (G-G) approximation is used for the elastic scattering kernel, while Volkin's model is used for the inelastic one. A differential-difference equation for a one-level excited state is solved by Laplace transform. Discussion of the poles obtained in the Laplace inverse shows th at there are forbidden zones in which there is no solution. Numerical calculations of the collision density in Fes6 at 922 and 865 kev levels are performed, which give the same behaviour as obtained by Corngold. The average slowing-down time calculated with our approach agrees with Williams's result in the asymptotic solution. 
  Reference    Z. Naturforsch. 33a, 1452—1454 (1978); received September 16 1978 
  Published    1978 
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 TEI-XML for    default:Reihe_A/33/ZNA-1978-33a-1452.pdf 
 Identifier    ZNA-1978-33a-1452 
 Volume    33 
199Author    Hirokazu Fujisaka, Tomoji YamadaRequires cookie*
 Title    Theoretical Study of Time Correlation Functions in a Discrete Chaotic Process  
 Abstract    One-dimensional discrete chaotic processes are studied from a statistical-dynamical point of view. A set of equations which describe the behavior of the time correlation functions is derived with the aid of Mori's projector formalism. A condition under which a process is Markoffian is obtained, and an approximate method is developed for a non-Markoffian process. As an illustra­ tion, a time correlation function for a simple system is calculated and the comparison with results of computer simulations is made. The relation between the instability of a trajectory and the characteristic time of chaotic motions is also discussed. 
  Reference    Z. Naturforsch. 33a, 1455—1460 (1978); received October 6 1978 
  Published    1978 
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 TEI-XML for    default:Reihe_A/33/ZNA-1978-33a-1455.pdf 
 Identifier    ZNA-1978-33a-1455 
 Volume    33 
200Author    H. C. Petzold, W. BehmenburgRequires cookie*
 Title    Interaction Potentials of Hg-Ar from Temperature Dependent Absorption Spectra  
 Abstract    The temperature dependence of the absorption spectrum k(v) of Hg-Ar-mixtures in the range 30—1000 cm-1 about the center of the Hg-line a t vq = 39425 cm-1 (Ao = 2536.5 Ä) has been investigated in the temperature interval 473 —1273 K. The measurements were carried out at number densities 1.0 x 1017—9.1 X 1018 cm-3 for Hg and 9.4 x 1018—9.7 x 1018 cm-3 for Ar. Potentials for the Hg-Ar-system in the thermal energy range originating from the Hg-states 6xSo and 63Pi have been deduced from the data. I t turned out th a t they differ considerably from Lennard-Jones-functions. By comparison of the observed spectra with calculations on the basis of quantummechanical theory of collisional line broadening it is concluded th at transitions from free translational states of Hg-Ar-pairs as well as bound and quasi-bound vibrational states of the Hg-Ar-molecule contribute to the formation of the satellite structure on the short wavelength side of the Hg-line. 
  Reference    Z. Naturforsch. 33a, 1461 (1978); received September 28 1978 
  Published    1978 
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 TEI-XML for    default:Reihe_A/33/ZNA-1978-33a-1461.pdf 
 Identifier    ZNA-1978-33a-1461 
 Volume    33 
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