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41	Author	G. Böhm	Requires 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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	Identifier	ZNA-1980-35a-0293
	Volume	35

42	Author	WolfgangW. Osterhage	Requires 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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	Identifier	ZNA-1980-35a-0302
	Volume	35

43	Author	Veneta Tabakova, Kyncho Kynev	Requires 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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	Identifier	ZNA-1980-35a-0308
	Volume	35

44	Author	Jörg Fleischhauer, AdelN. Asaad	Requires 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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	Identifier	ZNA-1980-35a-0312
	Volume	35

45	Author	K.-D Willamowski, 0. E. Rössler	Requires 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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	Identifier	ZNA-1980-35a-0317
	Volume	35

46	Author	J. Kronenbitter, U. Schweizer, A. Schwenk	Requires 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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	Identifier	ZNA-1980-35a-0319
	Volume	35

47	Author	H.-D Försterling, H. Lamberz, H. Schreiber	Requires 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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	Identifier	ZNA-1980-35a-0329
	Volume	35

48	Author	M. Lazzari, L. Peraldo Bicelli, B. Rivolta	Requires 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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	Identifier	ZNA-1980-35a-0332
	Volume	35

49	Author	F. Rohwer, A. Guarnieri	Requires 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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	Identifier	ZNA-1980-35a-0336
	Volume	35

50	Author	M. Umeno, G. Hildebrandt	Requires 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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	Identifier	ZNA-1980-35a-0342
	Volume	35

51	Author	R. Twardowski, C. Bojarski	Requires 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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	Identifier	ZNA-1980-35a-0345
	Volume	35

52	Author	P. S. Grover	Requires 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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	Identifier	ZNA-1980-35a-0350
	Volume	35

53	Author	Fritz Bopp	Requires 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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	Identifier	ZNA-1980-35a-0355_n
	Volume	35

54	Author	P. B. Rakshit, Warneck	Requires cookie*
	Title	A
	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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	Volume	35

55	Author	V. F. Buchwald	Requires 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

56	Author	M. Kwiatkowski, U. Tcppner, P. Zimmermann	Requires 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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	Identifier	ZNA-1980-35a-0370
	Volume	35

57	Author	E. G. Visser, W. Geertsma, W. Van Der Lugt, J. M. Th, De Hosson	Requires 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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	Identifier	ZNA-1980-35a-0373
	Volume	35

58	Author	Z. Salamon, A. Skibiński	Requires 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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	Identifier	ZNA-1980-35a-0378
	Volume	35

59	Author	W. Weppner, Chen Li-Chuan, W. Piekarczyk	Requires 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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	Identifier	ZNA-1980-35a-0381
	Volume	35

60	Author	H. J. Stolz, G. Trageser	Requires 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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	Identifier	ZNA-1980-35a-0389
	Volume	35

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