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1980[X]
41Author    G. BöhmRequires cookie*
 Title      
 Abstract    A resonant coupling mechanism is presented which leads to nearly full absorption of an electro-magnetic wave in an overdense plasma column. In the resonance case a strong enhancement of the electric field strength within the plasma is found. Under certain conditions this high electric field strength causes parametric excitation of plasma waves in the underdense edges of the discharge. It turned out that the occurance of this decay process is mainly determined by the density gra-dients in the plasma. 
  Reference    Z. Naturforsch. 35a, 293—301 (1980); received November 15 1979 
  Published    1980 
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 TEI-XML for    default:Reihe_A/35/ZNA-1980-35a-0293.pdf 
 Identifier    ZNA-1980-35a-0293 
 Volume    35 
42Author    WolfgangW. OsterhageRequires cookie*
 Title    Geometrie Unification of Classical Gravitational and Electromagnetic Interaction in Five Dimensions: a Modified Approach  
 Abstract    A unification of the gravitational with the electromagnetic interaction within a classical framework is proposed. It is based on a Fs-geometry, with x^ — qjm. The sole source term is mechanical stress energy, positioned along X5. The trajectories of testbodies are placed in V4 (xo = const)-slices. The final field equation couples a geometric G-tensor to mechanical stress energy, its momentum with respect to X5 and the change of this momentum with proper time r. 
  Reference    Z. Naturforsch. 35a, 302—307 (1980); received August 11 1979 
  Published    1980 
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 TEI-XML for    default:Reihe_A/35/ZNA-1980-35a-0302.pdf 
 Identifier    ZNA-1980-35a-0302 
 Volume    35 
43Author    Veneta Tabakova, Kyncho KynevRequires cookie*
 Title    Emission Spectra of Crystal Phosphor BaCl2-Pb  
 Abstract    Emission spectra of Pb 2+ centres in barium chloride single crystals have been studied between 4 and 300 K by excitation with different wave lengths. Excitation spectra at 300 K have also been obtained by measuring the emission in the maxima of the shoitwave and longwave bands. The results allow to conclude that the high energy emission band is due to the transition | 3 Tiu > —* • | J Aig > in the activator ion. The more effective excitation of the low energy emission band ob-served in the shortwave region of the absorption spectrum and the complex nature of both bands are discussed. 
  Reference    Z. Naturforsch. 35a, 308—311 (1980); received December 24 1979 
  Published    1980 
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 TEI-XML for    default:Reihe_A/35/ZNA-1980-35a-0308.pdf 
 Identifier    ZNA-1980-35a-0308 
 Volume    35 
44Author    Jörg Fleischhauer, AdelN. AsaadRequires cookie*
 Title    Ermittlung der Elektronenaffinitäten von Maleinsäureanhydrid, -thioanhydrid, -imid und einiger ihrer disubstituierten Halogen- derivate über CT-Messungen und ihre semiempirische Berechnung (MINDO/3)  
  Reference    Z. Naturforsch. 35a, 312—316 (1980); eingegangen am 5. Dezember 1979 
  Published    1980 
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 TEI-XML for    default:Reihe_A/35/ZNA-1980-35a-0312.pdf 
 Identifier    ZNA-1980-35a-0312 
 Volume    35 
45Author    K.-D Willamowski, 0. E. RösslerRequires cookie*
 Title    Irregular Oscillations in a Realistic Abstract Quadratic Mass Action System  
 Abstract    An open three-variable mass action kinetics is presented which exhibits chaotic behavior under numerical simulation. The elementary reactions of this system are at most of second order and satisfy the requirements of thermodynamics as long as the system is closed. 
  Reference    Z. Naturforsch. 35a, 317—318 (1980); received December 24 1979 
  Published    1980 
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 TEI-XML for    default:Reihe_A/35/ZNA-1980-35a-0317.pdf 
 Identifier    ZNA-1980-35a-0317 
 Volume    35 
46Author    J. Kronenbitter, U. Schweizer, A. SchwenkRequires cookie*
 Title    09 Ag NMR-Studies of the Selective Solvation of the Ag + -Ion in Water-Ethylamine-Mixtures and of the Coordination of Halide-Anions to the Silver-Ethylamine Solvate Complexes  
 Abstract    109 Ag chemical shift measurements of 0.02 up to 3 molar solutions of AgNOa, AgCl, and AgBr in solvent mixtures of H2O (W) and ethylamine (ea) were performed. The extremely long relax-ation times T\ and T2 were determined with new techniques. The Ag + -ion in solvent mixtures of W and ea shows a strongly selective solvation by ea. The 109 Ag chemical shift of the solvate complex [Ag ea2] + surrounded solely by W is 62 = (335 ± 2) ppm (referred to the Ag+-ion in W). A further solvation in addition to the inner solvation sphere was determined; this solvation is not or only weakly selective. There is a rapid chemical exchange; the lifetime of the inner solvation sphere is long compared with the Larmor period, whereas the solvation outside this sphere is changed in times shorter than the Larmor period. In contrast to the N03~-anion, the halide anions Cl~ and Br~ are partly coordinated to the [Ag ea2] + complex. The equilibrium constants for this coordination were determined as well as the chemical shifts of the [Ag ea2 • Cl] and the [Ag ea2 • Br] complexes. The bromine ion is coor-dinated for shorter times than the Larmor period, whereas the time of the coordination of the chlorine ion may be comparable to the Larmor period or shorter. 
  Reference    Z. Naturforsch. 35a, 319—328 (1980); received December 24 1979 
  Published    1980 
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 TEI-XML for    default:Reihe_A/35/ZNA-1980-35a-0319.pdf 
 Identifier    ZNA-1980-35a-0319 
 Volume    35 
47Author    H.-D Försterling, H. Lamberz, H. SchreiberRequires cookie*
 Title    Investigation of the Ce 3 + /Br03 ~-Reaction  
 Abstract    The reaction between Ce 3+ and bromate was studied in sulfuric acid solution using a dual wavelength spectrometer. From the spectral dependence of the absorbanee in the region from 450 to 600 nm it is concluded that Br02 is an intermediate of the reaction. The kinetics of forma-tion and decay of Br02 is compared to theoretical models. 
  Reference    Z. Naturforsch. 35a, 329—331 (1980); received December 22 1979 
  Published    1980 
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 TEI-XML for    default:Reihe_A/35/ZNA-1980-35a-0329.pdf 
 Identifier    ZNA-1980-35a-0329 
 Volume    35 
48Author    M. Lazzari, L. Peraldo Bicelli, B. RivoltaRequires cookie*
 Title    Kinetics of the Solid State Reaction between CuO and W03  
 Abstract    The solid state reaction of CUWO4-2 formation from CuO and WO3 was studied by the contact method in air and nitrogen. The results showed that the reaction is governed by the diffusion of the W 6+ and 0 2_ ions and that the rate determining step is the diffusion of oxygen ions in the reaction product. This is in agreement with the defect structure of copper tungstate, an n-type semiconductor with oxygen vacancies through which the diffusion process is possible. 
  Reference    Z. Naturforsch. 35a, 332—335 (1980); received November 24 1979 
  Published    1980 
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 TEI-XML for    default:Reihe_A/35/ZNA-1980-35a-0332.pdf 
 Identifier    ZNA-1980-35a-0332 
 Volume    35 
49Author    F. Rohwer, A. GuarnieriRequires cookie*
 Title    The Rotational Zeeman Effect of Nitrosylfluoride  
 Abstract    The rotational Zeeman effect of low J transitions of Nitrosylfluoride in the centimetre and millimetre waveranges has been investigated with fields up to 24 kG. (/-Factors with signs coidd be determined using the effect of the nitrogen quadrupole coupling interactions. A value for the partial susceptibility contribution of the nitrogen —N= has been estimated. 
  Reference    Z. Naturforsch. 35a, 336—341 (1980); received January 22 1980 
  Published    1980 
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 TEI-XML for    default:Reihe_A/35/ZNA-1980-35a-0336.pdf 
 Identifier    ZNA-1980-35a-0336 
 Volume    35 
50Author    M. Umeno, G. HildebrandtRequires cookie*
 Title    (111,111/002) Enhanced Borrmann Effect in Heat Treated Czochralski Grown Silicon Crystals  
  Reference    Z. Naturforsch. 35a, 342 (1980); received February 15 1980 
  Published    1980 
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 TEI-XML for    default:Reihe_A/35/ZNA-1980-35a-0342.pdf 
 Identifier    ZNA-1980-35a-0342 
 Volume    35 
51Author    R. Twardowski, C. BojarskiRequires cookie*
 Title    Prediction of the Influence of Concentration on the Photoluminescence Decay Time of Solutions  
 Abstract    A formula for the donor photoluminescence decay time in its dependence on the concentrations of donor D and acceptor A has been derived from equations for the non-radiative excitation energy transfer between randomly distributed donor and acceptor molecules within a nonactive medium. In the limit [D]/[A] -> 0 the formula becomes identical with that of Galanin [7], while in the absence of concentration quenching the fluorescence decay time does not depend on the concentrations. 
  Reference    Z. Naturforsch. 35a, 345—349 (1980); received November 7 1979 
  Published    1980 
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 TEI-XML for    default:Reihe_A/35/ZNA-1980-35a-0345.pdf 
 Identifier    ZNA-1980-35a-0345 
 Volume    35 
52Author    P. S. GroverRequires cookie*
 Title    High Temperature Behaviour of Positrons in Argon  
 Abstract    The annihilation decay rates and average energy of positrons in argon gas have been calculated using the Boltzmann diffusion equation formalism at high temperatures as a function of electric fields. A comparison is made between the theoretical and experimental results. The agreement obtained is quite reasonable. 
  Reference    Z. Naturforsch. 35a, 350—354 (1980); received July 7 1979 
  Published    1980 
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 TEI-XML for    default:Reihe_A/35/ZNA-1980-35a-0350.pdf 
 Identifier    ZNA-1980-35a-0350 
 Volume    35 
53Author    Fritz BoppRequires cookie*
 Title    Eichfeldtheorie zur U3-invarianten Pais-Gleichung  
 Abstract    Gauge Field Theory of an U3-invariant Pais Equation We are looking for the gauge field theory which cor-responds to the U3-invariance of the recently obtained free particle Dirac equation generalized according to an idea of Pais. 
  Reference    Z. Naturforsch. 35a, 355—357 (1980); eingegangen am 8. Februar 1980 
  Published    1980 
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 TEI-XML for    default:Reihe_A/35/ZNA-1980-35a-0355_n.pdf 
 Identifier    ZNA-1980-35a-0355_n 
 Volume    35 
54Author    P. B. Rakshit, WarneckRequires cookie*
 Title     
 Abstract    The reactions of C02-C02 + ions with S02 , 02, C2H2, COS, NH3, and CS2 have been re-investigated to determine the yields of products of the type C02-A + , where A is the neutral reactant molecule. The same products are also form-ed by third body attachment of A + to C02 . In addition, A2 + cluster ions are observed in several cases. Rate coef-ficients for these reactions are given. 
  Reference    Z. Naturforsch. 35a, 358—360 (1980); received March 3 1980 
  Published    1980 
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 TEI-XML for    default:Reihe_A/35/ZNA-1980-35a-0358_n.pdf 
 Identifier    ZNA-1980-35a-0358_n 
 Volume    35 
55Author    V. F. BuchwaldRequires cookie*
 Title    Seven Shock-transformed Hexahedrites, Sensitive to Grainboundary Corrosion  
 Abstract    Seven polycrystalline iron meteorites (Forsyth County, Holland's Store, Wathena, Pima Co., Chico Mountains, Kopjes Vlei and Mejillones), of bulk composition as normal hexahedrites of group 11 A, are shown to be severely altered hexahedrites. Mic-roprobe examination and various heat treatments of synthetic alloys support the conclusion that the meteorites after a primary slow cooling were subjected to shock-reheating above 800°C. Thereby the following transforma-tions took place a-^-y—>a2—>a, and an unequilibrated structure, very sensitive to grain-boundary corrosion was formed. 
  Reference    Z. Naturforsch. 35a, 361—369 (1980); received January 21 1980* 
  Published    1980 
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 TEI-XML for    default:Reihe_A/35/ZNA-1980-35a-0361.pdf 
 Identifier    ZNA-1980-35a-0361 
 Volume    35 
56Author    M. Kwiatkowski, U. Tcppner, P. ZimmermannRequires cookie*
 Title    Laserspectroscopic Investigations in the Configuration 5d6s6p of Lu I  
 Abstract    In an atomic beam of Lu, six levels of the configuration 5d0sGp in the energy range 18000 to 23000 cm 1 were selectively populated with the light of a pulsed dye laser. Time resolved obser-vation of the recmitted resonance light was used to deduce the lifetimes of the cxcited levels. 
  Reference    Z. Naturforsch. 35a, 370—372 (1980); received March 1 1980 
  Published    1980 
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 TEI-XML for    default:Reihe_A/35/ZNA-1980-35a-0370.pdf 
 Identifier    ZNA-1980-35a-0370 
 Volume    35 
57Author    E. G. Visser, W. Geertsma, W. Van Der Lugt, J. M. Th, De HossonRequires cookie*
 Title    On the X-ray Scattering Factor of Metallic Lithium in the Long-Wavelength Limit: The "Solid State Effect"  
 Abstract    By considering three successive approximations to the conduction-electron wavefunction of metallic lithium, it is shown that the X-ray scattering factor at small wavevectors is very sensitive to the model chosen for describing the electron density. It is demonstrated that, when screened pseudopotentials are used, the "solid state effect" is almost negligible in this region of wave-vectors. 
  Reference    Z. Naturforsch. 35a, 373—377 (1980); received December 21 1979 
  Published    1980 
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 TEI-XML for    default:Reihe_A/35/ZNA-1980-35a-0373.pdf 
 Identifier    ZNA-1980-35a-0373 
 Volume    35 
58Author    Z. Salamon, A. SkibińskiRequires cookie*
 Title    Solvent Effects on the Spectral Properties of the Methine Dyes  
 Abstract    The spectral characteristics (absorption, fluorescence and lifetimes of fluorescence) of methine dyes in different solvents are presented. The results show that the methine dyes in polar solvents emit a dual fluorescence. From the dependence of the fluorescence spectrum on the dye con-centration it is suggested that excimer formation is responsible for the second band of fluorescence. 
  Reference    Z. Naturforsch. 35a, 378—380 (1980); received February 10 1980* 
  Published    1980 
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 TEI-XML for    default:Reihe_A/35/ZNA-1980-35a-0378.pdf 
 Identifier    ZNA-1980-35a-0378 
 Volume    35 
59Author    W. Weppner, Chen Li-Chuan, W. PiekarczykRequires cookie*
 Title    Electrochemical Determination of Phase Diagrams and Thermodynamic Data of Multi-Component Systems  
 Abstract    The coulometric titration technique is extended to treat general cases of systems of any number of components. Complete equilibrium phase diagrams and thermodynamic properties are obtained from readily and precisely measurable electrical quantities, employing only a small number of samples. General equations are derived which directly relate the cell voltage to the standard Gibbs energies, enthalpies and entropies of formation of all phases involved without the necessity of considering specific cell reactions. The application of the technique to the ternary system Cu—Ge—O is demonstrated. 
  Reference    Z. Naturforsch. 35a, 381—388 (1980) 
  Published    1980 
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 TEI-XML for    default:Reihe_A/35/ZNA-1980-35a-0381.pdf 
 Identifier    ZNA-1980-35a-0381 
 Volume    35 
60Author    H. J. Stolz, G. TrageserRequires cookie*
 Title    Correlation Between Structure and Phonon Spectra of Linear Polyiodide Chains in T1 6 I 6 M^(I 4 ) 2 -, [M = Pb, Ag, Au, (Bi 0 . 3 Tl«. 5 )]  
 Abstract    Raman-and IR-spectra of four compounds of the general composition TlelöMj/",, (I4) \n: formal valence of the M-atom, M = Ag, Au, Pb and (Bio.sTlo.s)] were investigated in order to identify the polyiodide species present. In accordance with structural results comparable amounts of l4 2-and l3~/I~-groups were found for M = Ag, Pb and (Bio.sTlo.s), while in Tl6l6Au2(Li) I3 _ /I~-groups predominate. 
  Reference    Z. Naturforsch. 35a, 389—391 (1980); received March 1 1980 
  Published    1980 
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 TEI-XML for    default:Reihe_A/35/ZNA-1980-35a-0389.pdf 
 Identifier    ZNA-1980-35a-0389 
 Volume    35 
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