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1978[X]
141Author    B. R. Uščić, B. Kovač, L. Klasinc, H. GüstenRequires cookie*
 Title    Photoelectron Spectroscopy of Heterocycles. Fluorene Analogues  
 Abstract    The He(I) photoelectron spectra of fluorene and its analogues, biphenyl, dibenzofuran, carbazole, dibenzothiophene, and phenanthrene were measured and analyzed. The assignment of the ^-electron ionizations using orbital interaction and symmetry arguments for the constituent parts of the molecules indicates that the energy levels of the fluorene analogues can be reproduced within a few percent of error. A close linear correlation between the "z-ionization energies and the eigenvalues of the corresponding HMO-orbitals 
  Reference    Z. Naturforsch. 33a, 1006 (1978); received May 16 1978 
  Published    1978 
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 TEI-XML for    default:Reihe_A/33/ZNA-1978-33a-1006.pdf 
 Identifier    ZNA-1978-33a-1006 
 Volume    33 
142Author    W. Harbich, R. M. Servuss, W. HelfrichRequires cookie*
 Title    Passages in Lecithin-Water Systems  
 Abstract    Large numbers of tunnel-like structures apparently connecting neighbouring bilayers were found in phase-contrast microscopy of certain preparations of egg lecithin in water. These passages either cause a pairing of the bilayers or form threedimensional lattices. They appear to originate while the lecithin swells in water. Some theoretical aspects of passage formation in fluid bilayers is shown to be Aiix, x being the elastic modulus of Gaussian curvature. 
  Reference    Z. Naturforsch. 33a, 1013—1017 (1978); received June 29 1978 
  Published    1978 
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 TEI-XML for    default:Reihe_A/33/ZNA-1978-33a-1013.pdf 
 Identifier    ZNA-1978-33a-1013 
 Volume    33 
143Author    S. Günther, 0. Lutz, A. Nolle, P. G. SchradeRequires cookie*
 Title    Temperature Dependence of the Nuclear Quadrupole Frequencies of 23Na and 187Re in N a R e 0 4  
 Abstract    The temperature dependence of the quadrupole frequency of 187Re measured by N Q R and of 23Na measured by N M R has been determinedfor temperatures between 170Kand 300Kin NaReO,}. For both nuclei the quadrupole frequency decreases with increasing temperature. The dependence is stronger for 187Re than for 2 3 Na. 
  Reference    Z. Naturforsch. 33a, 1018 (1978); received June 14 1978 
  Published    1978 
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 Identifier    ZNA-1978-33a-1018 
 Volume    33 
144Author    O. Lutz, H. Oehler, P. KroneckRequires cookie*
 Title    Chemical Shifts and Coupling Constants in Copper (I)-Compounds by 63Cu and 65Cu FT-NMR Studies  
 Abstract    Using 63Cu and 65Cu FT NM R, chemical shifts and large indirect spin-spin-coupling constants with phosphorus were measured in dissolved copper (I) compounds. The nuclear magnetic shiel­ ding constants derived from the chemical shifts were given in the atomic reference scale. No isotope effect for spin-spin-coupling constants was found. 
  Reference    Z. Naturforsch. 33a, 1021 (1978); received June 19 1978 
  Published    1978 
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 TEI-XML for    default:Reihe_A/33/ZNA-1978-33a-1021.pdf 
 Identifier    ZNA-1978-33a-1021 
 Volume    33 
145Author    W. Koch, A. Lutz, NolleRequires cookie*
 Title    Fourier Transform N M R Investigations of 77Se in Aqueous Solutions  
 Abstract    In solutions of H^SeOs, Na2 Se0 3 , NaHSeOß and Na2 Se0 4 in H 2 O N M R signals of 77Se have been observed. In these solutions chemical shifts were determined. In a 4 molal solution of Na2 Se0 3 
  Reference    Z. Naturforsch. 33a, 1025—1028 (1978); received July 1 1978 
  Published    1978 
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 Identifier    ZNA-1978-33a-1025 
 Volume    33 
146Author    K. Hollenberg, F. MüllerRequires cookie*
 Title    Stoßwellen-Druckmessungen an Aluminium, Polymethylmethacrylaten und Polyvinylchloriden m it Hilfe von Röntgen-Absorption  
 Abstract    Shock-Wave Compression Measurements of Aluminium, Polymethylmethacrylate and Polyvinyl­ chloride by X-ray-Absorption Pressure-compression curves for Aluminium, Polymethylmethacrylate and Polyvinylchloride are determined in the pressure range from 100 kbar to 300 kbar by flash x-ray absorption mea­ surements. Results are in good accordance with free-surface data. Certain systematic deviations of shock adiabates obtained by x-ray absorption from the results obtained by other authors using the free-surface method, are discussed. 
  Reference    Z. Naturforsch. 33a, 1029 (1978); received June 10 1978 
  Published    1978 
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 Identifier    ZNA-1978-33a-1029 
 Volume    33 
147Author    H.-D Knauth, H. MartinRequires cookie*
 Title    Die Kinetik des thermischen Zerfalls von C lN O a Thermal Decomposition of CINO2  
 Abstract    CINO2 decomposes incompletely at temperatures between 353 K and 373 K in the nonpolar inert solvent C7 F 1 5 CI according to 2 CINO2 = 2 N 0 2 + Cl2 . (a) Some C1NO is formed as by-product according to 2 CINO2 = 2 C1NO + 0 2 . (b) 
  Reference    Z. Naturforsch. 33a, 1037 (1978); eingegangen am 4. Mai 1978 
  Published    1978 
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 TEI-XML for    default:Reihe_A/33/ZNA-1978-33a-1037.pdf 
 Identifier    ZNA-1978-33a-1037 
 Volume    33 
148Author    M. Nagel, G. Brunner, K.-P Dostal, E. Hartmann, D. Hinneburg, H. Kupsch, D. Pabst, A. RigóRequires cookie*
 Title    O n the Chemically Induced Decay Constant Variation of Tc-99 m  
 Abstract    The chemical induced decay constant variations for some complex compounds of Tc-99 m were measured by means of a semidifferential approach, using the scintillation technique. The results are A(TcOzr) -A(TcCl62-) = (2.52 ± 0.30) • 10-3 / , A(TcCl62-) -A(TcBr62_) = (-0 . 0 2 ± 0 .2 0) • 1 0 "3 1 , A (TcCle2-) -A (TcI62-) = (0.78 ± 0.41) • 10~ 3 A , A(Tc04~) — A(TcI62-) = (3.30 ± 0.30) • IO" 3 A, A(Tc04~) -A(TcBr62-) = (2.50 ± 0.41) • 10~ 3 A . Theoretical estimations by means of atomic structure calculations show that Tc04~ should have the greatest decay constant among the compounds investigated, in accordance with the measured values, and that the decay constants of the octahedral complexes should follow the spectro-chemical series, partly confirmed by the experiments. 
  Reference    Z. Naturforsch. 33a, 1050—1055 (1978); received June 12 1978 
  Published    1978 
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 TEI-XML for    default:Reihe_A/33/ZNA-1978-33a-1050.pdf 
 Identifier    ZNA-1978-33a-1050 
 Volume    33 
149Author    W. KosmusRequires cookie*
 Title    Semiempirisches Punktladungsmodell zur Berechnung von V alenzkraf tkonstanten A Semiempirical Formula to Estimate Valence Force Constants  
 Abstract    A semiempirical formula to estimate valence force constants is derived. Using CNDO data, it is possible to get much better results than from empirical rules. The application of a simple point charge model allows a discussion of chemical binding. 
  Reference    Z. Naturforsch. 33a, 1056—1061 (1978); received June 2 1975 
  Published    1978 
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 TEI-XML for    default:Reihe_A/33/ZNA-1978-33a-1056.pdf 
 Identifier    ZNA-1978-33a-1056 
 Volume    33 
150Author    W. H. Eudorfer, G. M. ArowskyRequires cookie*
 Title    Optical Gain and Saturation Considerations of Organic Dyes  
 Abstract    A theoretical analysis o f optical gain and saturation o f organic dye lasers is presented. An analysis based on a solution o f the laser rate equations establishes a convenient method o f optical gain measurement by internal fluorescence probing for low-gain system s, such as vapors o f organic dyes. The concom itant lim itations o f high-gain system s (e.g. organic dyes in liquid solutions) o f small-signal gain due to amplified spontaneous em ission (ASE) and problems associated w ith gain saturation a t high signal inputs are discussed in detail. 
  Reference    Z. Naturforsch. 33a, 1062 (1978); received April 26 1978 
  Published    1978 
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 Identifier    ZNA-1978-33a-1062 
 Volume    33 
151Author    W. L. Ubitz, W. Broser, B. K. Irste, H. K. Urreck, K. SchubertRequires cookie*
 Title    3C-and 1H -EN D O R Studies of a Phenoxyl Type Radical  
 Abstract    13C-and 1H -E N D O R studies on a phenoxyl type radical in fluid solution are reported. The 13C-EN DO R resonance lines are comparable w ith those o f the protons concerning am plitude, linew idth, and optim um experim ental conditions. These findings are in contrast to previous E N D O R experim ents on other 13C-labelled system s and can be explained by assum ing sim ilar hfs anisotropies for carbon-13 and protons in this radical. From saturation m easurem ents th e re­ laxation parameters were determined. The hyperfine couplings are discussed in term s o f M cLachlan and IN D O calculations. For the first tim e natural abundance 13C -EN D O R m easurem ents have been successful. 
  Reference    Z. Naturforsch. 33a, 1072 (1978); received June 15 1978 
  Published    1978 
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 Identifier    ZNA-1978-33a-1072 
 Volume    33 
152Author    B. Engelen, F. SchneiderRequires cookie*
 Title    Zustandsdiagramme und röntgenographische Untersuchungen einiger induzierter smektischer Mischphasen Phase Diagrams and X -R ay Studies of the Induced Smectic Phases of Liquid Crystal Mixtures  
 Abstract    Phase diagrams o f m ixtures o f terminal polar and terminal non-polar liquid crystals th at exhibit sm ectic phases w ith very large ranges o f stability are presented. X -ray studies show that the in­ duced phases are o f typ e S a , S b or S e -The determ ination o f the layer thickness shows that the induced sm ectic phases are com posed o f m onolayers, whereas the terminal polar com ponents are composed o f bilayers. A model for th e formation o f the induced sm ectic phases is proposed. 
  Reference    Z. Naturforsch. 33a, 1077 (1978); eingegangen am 22. Juni 1978 
  Published    1978 
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 Identifier    ZNA-1978-33a-1077 
 Volume    33 
153Author    M. Capitelli, M. D. IlonardoRequires cookie*
 Title    N on Equilibrium Dissociation of HF in Electrical Discharges: The Role of Vibrational Excitation  
 Abstract    D issociation rates o f H F in electrical discharges have been calculated by solving a system o f vibrational master equations, including e-V (electron-vibration), V-V (vibration-vibration) and V-T (vibration-translation) energy exchanges. The results show that large dissociation rates can be obtained by this m echanism only when the e-V pum ping rates overcome the V-T deactivating rates. This occurs for electron number densities larger than 1013cm-3 . F in ally the close connection o f the present results w ith the corresponding ones obtained by using as vibrational excitation source an IR powerfull laser is shown and discussed. 
  Reference    Z. Naturforsch. 33a, 1085 (1978); received J u ly 3 1978 
  Published    1978 
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 Identifier    ZNA-1978-33a-1085 
 Volume    33 
154Author    DouglasL D OrsetRequires cookie*
 Title    Continuous Diffuse Electron Scattering from Polymethylene Compounds II. Oblique Layer Crystals  
 Abstract    The positions o f continuous diffuse scattering streaks in electron diffraction patterns from oblique layer crystals isostructura 1 to monoclinic paraffins are predicted using the kinem atical difference Fourier transform (DFT) model o f Amoros and Amoros. H owever, indications o f correlated chain m otions are found as was seen in a bimolecular rectangular layer structure. This correlated chain " m otion" and the large temperature factors used for the D F T calculation (which are inconsistent w ith X -ray crystal structure results) suggest the presence o f point defects in the long chains pro­ posed earlier by other workers. 
  Reference    Z. Naturforsch. 33a, 1090—1092 (1978); received Ju ly 4 1978 
  Published    1978 
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 TEI-XML for    default:Reihe_A/33/ZNA-1978-33a-1090.pdf 
 Identifier    ZNA-1978-33a-1090 
 Volume    33 
155Author    Laboratorium Des, Verfassers GundelfingenRequires cookie*
 Title    P ete r B rauer Negative Isotope Effect of the Phase Transition I I —I I I in (  
 Abstract    und Irm in R . J a h n In stitu t für K ristallographie der U niversität Tübingen 
  Reference    Z. Naturforsch. 33a, 1093 (1978); eingegangen am 6. Jun i 1978 
  Published    1978 
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 TEI-XML for    default:Reihe_A/33/ZNA-1978-33a-1093_n.pdf 
 Identifier    ZNA-1978-33a-1093_n 
 Volume    33 
156Author    H. H. Offm, Ann, M. NeigerRequires cookie*
 Title    Spectroscopic Observation Radiative Recombination of Ground State Oxygen Atoms  
 Abstract    Measurements o f uv-radiation em itted from a low current oxygen arc plasma show continuous emission, which can be attributed to radiative molecular recombination o f ground state oxygen atoms. 
  Reference    Z. Naturforsch. 33a, 1099 (1978); received May 26 1978 
  Published    1978 
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 Identifier    ZNA-1978-33a-1099_n 
 Volume    33 
157Author    H. Wolff, N., A. SchmillenRequires cookie*
 Title    Eine Modellbetrachtung zur Triplettkinetik von Anthracen/Tetracen Kristallen A Model consideration of the Triplet Kinetics in Anthracene/T et racene Crystals  
 Abstract    Earlier measurements on anthracene/tetracene crystals are now interpreted w ith a simplified new model o f the triplet kinetics. One result is a threefold exponential decay o f the delayed fluores­ cence o f both host and guest. The lowest decay rate as function o f the guest concentration yields 
  Reference    Z. Naturforsch. 33a, 1115—1121 (1978); eingegangen am 9. Juli 197S 
  Published    1978 
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 TEI-XML for    default:Reihe_A/33/ZNA-1978-33a-1115.pdf 
 Identifier    ZNA-1978-33a-1115 
 Volume    33 
158Author    0. SeebergRequires cookie*
 Title    On Master Operators with Extremal Entropy Production  
 Abstract    In s titu t für Theoretische Physik der Johann W olfgang G oethe-U niversität, F ran k fu rt am Main The m aster operators B which cause the entropy production dH/dt — —k~l dS/dt to become extrem al for fixed statistical operators W are constructed and discussed. There are boundaries of the set 23 of m aster operators, 23 = {B | E B2V I1 = ft} for which th e problem is solvable yielding minimal entropy production, while no solution exists in th e set 23 w ithout any constraints. O perators w ith maximal entropy production m ust be extrem al points of 23. 
  Reference    Z. Naturforsch. 33a, 1122—1132 (1978); received Ju n e 22 1978 
  Published    1978 
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 TEI-XML for    default:Reihe_A/33/ZNA-1978-33a-1122.pdf 
 Identifier    ZNA-1978-33a-1122 
 Volume    33 
159Author    Eberhard KernRequires cookie*
 Title    Die Pauli-Gleichung mit Differentialoperatoren für den Spin  
 Abstract    The Pauli Equation with Differential Operators for the Spin The spin operator s — (h/2) a in the Pauli equation fulfills the com m utation relation of the angular m om entum and leads to half-integer eigenvalues of the eigenfunctions for s. I f one tries to express s by canonically conjugated operators and n = (h/i) <5/0<I> the formal angular mom entum term s = <I> x n fails because it leads only to whole-integer eigenvalues. However, the modification of this term in the form s = \ {tc + 4»(«I> k) + X n} leads to the required result. The eigenfunction system belonging to this differential operator s(4>, ii) consists of (2 s + 1) spin eigenfunctions | m(^) which are given explicitly. They form a basis for the wave functions of a particle of spin s. Applying this formalism to particles w ith s = 1/2, agreement is reached w ith Pauli's spin theory. The function s(4>, n) follows from the theory of rotating rigid bodies. The continuous spin-variable «f> = ((Ox, Qy, @z) can be interpreted classically as a 'turning vector" which defines the orientation in space of a rigid body. is th e positioning coordinate of the rigid body or the spin coordinate of th e particle in analogy to th e cartesian coordinate x. The spin s is a vec­ tor fixed to the body. 
  Reference    Z. Naturforsch. 33a, 1133—1150 (1978); eingegangen am 1. Ju li 1978* 
  Published    1978 
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 TEI-XML for    default:Reihe_A/33/ZNA-1978-33a-1133.pdf 
 Identifier    ZNA-1978-33a-1133 
 Volume    33 
160Author    W. Alter, Knoll, Siegfried SteebRequires cookie*
 Title    Structure of Molten Sn-Zn-Alloys by Means of Neutron Diffraction  
 Abstract    N eutron diffraction experim ents were performed with four molten Sn-Zn-alloys and the two molten elem ents Sn and Zn. The to tal structure factors and the pair correlation functions are given. The observed small angle scattering leads to the result th a t pairs of equal atom s predom i­ nate within the range of medium concentrations. 
  Reference    Z. Naturforsch. 33a, 1151 (1978); received Ju ly 12 1978 
  Published    1978 
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 TEI-XML for    default:Reihe_A/33/ZNA-1978-33a-1151.pdf 
 Identifier    ZNA-1978-33a-1151 
 Volume    33 
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