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1989 (196)
121Author    E. Matsubara, Y. Waseda, K. Inomata, S. HashimotoRequires cookie*
 Title    X -r a  
 Abstract    y S t r u c t u r a l S tu d y o f F e r ro m a g n e tic V itre o u s 0 .5 L a 0 7S r 0 3M n 0 30 .5 B 20 3 The ordinary x-ray diffraction profile and the anomalous x-ray scattering profiles at Sr K-absorp-tion edge were measured in a ferromagnetic oxide glass of 0.5Lao 7Sr0 3Mn030.5B20 3. The result indicates the characteristic feature of coexistence of a highly ordered perovskite La0 7Sr0 3Mn03-like region and a random network structure consisting of B03 triangles. It is expected that the characteristic magnetic properties of this sample are attributed to this distinctive structure. 
  Reference    Z. Naturforsch. 44a, 723—725 (1989); received May 19 1989 
  Published    1989 
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 Identifier    ZNA-1989-44a-0723 
 Volume    44 
122Author    B. Vogelsanger, A. BauderRequires cookie*
 Title     
 Abstract    im p lific a tio n o f R o ta tio n a l S p e c tr a a n d S p e c tr a l H o le B u rn in g by S e le c tiv e E x c ita tio n T e c h n iq u e s in M ic ro w a v e F o u r ie r T ra n s fo rm S p e c tro s c o p y Dedicated to Professor Helmut Dreizler on the Occasion of his Sixtieth Birthday Selective excitation techniques have been applied to pulsed microwave Fourier transform spec­ troscopy. The frequency selectivity in excitation has been reached either by a long, weak pulse, or by a DANTE multi-pulse sequence. The corresponding excitation spectra calculated from a density matrix theory are in good agreement with the experimental results. The selective excitation tech­ niques have been combined with double resonance sequences in order to simplify the recorded one-or two-dimensional spectra. Furthermore, selective excitation techniques have been applied to burn 'holes' into rotational transition lines broadened by an inhomogeneous Stark field. 
  Reference    Z. Naturforsch. 44a, 726—734 (1989); received June 27 1989 
  Published    1989 
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 TEI-XML for    default:Reihe_A/44/ZNA-1989-44a-0726.pdf 
 Identifier    ZNA-1989-44a-0726 
 Volume    44 
123Author    N. Heineking, M. Andolfatto, U. A. Keussen, H. Mues, DreizlerRequires cookie*
 Title      
 Abstract    The deuterium and chlorine nuclear quadrupole coupling constants have been determined for both of the chlorine isotopomers of deuterochloroacetylene (DCCC1), along with the rotational, centrifugal distortion, and chlorine spin-rotation coupling constants. The values are B = 5186.97631 (22) MHz, Dj= 1.13(2) k\\z,eQq(C\)= —79.7358(19) MHz,c,(Cl) = 1.10(31)kHz,and e09(D) = 207.0(28)kHz for DCCC1-35, and B = 5084.17839(30) MHz, Dj = 0.99(2) kHz, eQq(Cl)= -62.8451(27) MHz, (CI) = 0.76(43) kHz, and f £></(D) = 205.8(39) kHz for DCCC1-37. D e u te riu m Q u a d r u p o le C o u p lin g C o n s ta n ts in D e u te ro c h lo r o a c e ty le n e 
  Reference    Z. Naturforsch. 44a, 735—737 (1989); received June 2 1989 
  Published    1989 
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 Identifier    ZNA-1989-44a-0735 
 Volume    44 
124Author    Masataka Tansho, Daiyu Nakamura, Ryuichi IkedaRequires cookie*
 Title      
 Abstract    a n d T h e r m a l S tu d ie s o f C H 3N H 3B r in a M e ta s ta b l e S o lid P h a s e N e w ly F o u n d ab o v e 4 8 3 K By differential thermal analysis a new high-temperature solid phase of methylammonium bromide was found between 483 K and its "melting point" (510 K). 'H NMR absorption measurements revealed the presence of rapid 3D translational self-diffusion and overall rotation of methylammo­ nium cations in this phase. These cationic motions are quite analogous to those of methylammonium iodide in its ionic plastic phase. Surprisingly, this plastic-like phase is metastable, the stable phase in the same temperature range being liquid. 
  Reference    Z. Naturforsch. 44a, 738—740 (1989); received June 26 1989 
  Published    1989 
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 Identifier    ZNA-1989-44a-0738 
 Volume    44 
125Author    H-N, Hiroyuki Ishida, Tadashi Iwachido, Naomi Hayama, Mifune Terashima, Daiyu NakamuraRequires cookie*
 Title    S e lf  
 Abstract    D iffu s io n a n d R e o r ie n ta tio n o f M e th y la m m o n iu m Io n s in (C H 3N H 3) 2Z n C l 4 C r y s ta ls a s S tu d ie d by ' Differential thermal analysis, differential scanning calorimetry, and measurements of the 'H spin-lattice relaxation times and second moments of 'H-NMR absorptions were performed on methylam­ monium tetrachlorozincate (II) crystals over a wide temperature range. A solid-solid phase transition was located at 477 K. From the 'H-NMR experiments it was found that the cations undergo overall reorientation as well as three dimensional translational self-diffusion in the high-temperature phase. In the low-temperature phase, a 120° reorientational motion of the CH3 and NH,f groups of the cation about its C N bond axis was detected. The parameters for the motional modes of the cations in the crystal were evaluated from the analysis of the 'H-NMR experimental results. 
  Reference    Z. Naturforsch. 44a, 741—746 (1989); received June 19 1989 
  Published    1989 
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 Identifier    ZNA-1989-44a-0741 
 Volume    44 
126Author    Kazunori Ichioka, Isao Okada, Alfred KlemmRequires cookie*
 Title     
 Abstract    n te r n a l C a tio n M o b ilitie s in M o lte n (N a , A g) N 0 3 R e m e a s u re d by th e C o lu m n M e th o d Internal mobility ratios bNa/bA g in molten (Na, Ag)NO, have been measured with the column-method. From these, the densities and conductivities the internal mobilities have been calculated. Contrary to results obtained with other methods, over the investigated range of concentration and temperature, bA g is greater than The various methods are discussed. 
  Reference    Z. Naturforsch. 44a, 747—750 (1989); received June 27 1989 
  Published    1989 
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 Identifier    ZNA-1989-44a-0747 
 Volume    44 
127Author    H. Ehrlichmann, J.-U Grabow, H. Dreizler, N. Heineking, R. Schwarz, U. AndresenRequires cookie*
 Title     
 Abstract    M ic ro w a v e F o u r ie r T r a n s f o r m S p e c tr o m e te r in th e R e g io n fro m 4 to 6 G H z w ith D o u b le R e s o n a n c e M o d u la tio n We report on the experimental set up and performance of a microwave Fourier transform spectrometer for the G band from 4 to 6 GHz. The sensitivity, achievable linewidth, and resolution capability is demonstrated by measurements of rotational transitions of various molecules. 
  Reference    Z. Naturforsch. 44a, 751 (1989); received July 8 1989 
  Published    1989 
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 Identifier    ZNA-1989-44a-0751 
 Volume    44 
128Author    H. D. Lutz, A. Pfitzner, W. Schmidt, E. Riedel, D. PrickRequires cookie*
 Title      
 Abstract    Mössbauer-Investigation of the Li2FeCl4 Polymorphs The room temperature Mössbauer spectrum of the high-temperature polymorph of Li2FeCl4 is in agreement with an inverse spinel structure and a disordered distribution of the cations on the octahedral sites. Mössbauer spectra of the orthorhombic room-temperature modification of Li2FeCl4 correspond to a 1:1 ordering of Li + -and Fe2 + -ions on the octahedral sites. M ö ß b a u e r -U n te r s u c h u n g d e r M o d if ik a tio n e n von L i 2F e C l4 
  Reference    Z. Naturforsch. 44a, 756 (1989); eingegangen am 21. Juli 1989 
  Published    1989 
  Keywords    Lithium-iron-chloride, Mössbauer-spectroscopy, Cation distribution 
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 TEI-XML for    default:Reihe_A/44/ZNA-1989-44a-0756.pdf 
 Identifier    ZNA-1989-44a-0756 
 Volume    44 
129Author    K. Kochev, G. Popkirov, K. Ivanova, R. Quint, N. GetoffRequires cookie*
 Title    CdSe Photoanodes for Electrochemical Photovoltaic Conversion  
 Abstract    The paper presents experimental results obtained with a polycrystalline n-CdSe photoanode produced as recently described. The photoelectrochemical studies (I-V and C-V measurements), using a polysulfide electrolyte, indicate a rel­ atively high efficiency of 6.8%. 
  Reference    Z. Naturforsch. 44a, 759—760 (1989); received June 16 1989 
  Published    1989 
  Keywords    Photoelectrochemical solar cells, CdSe, Semi­ conductor photoelectrochemistry 
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 Identifier    ZNA-1989-44a-0759_n 
 Volume    44 
130Author    JerryRay DiasRequires cookie*
 Title      
 Abstract    An efficient graphical method for the calculation of alge­ braic structure count is presented which is an alternative to the method proposed by Gutman and is a generalization of the method of Randic. Note on Algebraic Structure Count 
  Reference    Z. Naturforsch. 44a, 761—762 (1989); received April 6 1989 
  Published    1989 
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 TEI-XML for    default:Reihe_A/44/ZNA-1989-44a-0761_n.pdf 
 Identifier    ZNA-1989-44a-0761_n 
 Volume    44 
131Author    A. Ogrodnik, M. E. Michel-BeyerleRequires cookie*
 Title    Doubt on Experimental Evidence for a Superexchange-Mediated Primary Electron Transfer in Photosynthetic Reaction Centers  
 Abstract    The key question with regard to the pathway of the primary electron transfer (ET) in photosynthetic reac­ tion centers is addressing the role of the monomer bacteriochlorophyll (B) which connects the primary donor 1P* and the bacteriopheophytin (H) as revealed in the X-ray structural analysis of R. viridis [1] and Rb. sphaeroides [2], B is expected to participate through the state (P + B). There are in principle two ways of such an involvement of B: (1) P + B~ is a real kinetic intermediate in a two-step ET as supported by recent femtosecond time resolved spectroscopy at 300 K [3] 1P*BH -» P +B"H -* P*BH-. 
  Reference    Z. Naturforsch. 44a, 763—764 (1989); received August 8 1989 
  Published    1989 
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 Identifier    ZNA-1989-44a-0763_n 
 Volume    44 
132Author    JerryRay DiasRequires cookie*
 Title     
 Abstract    F o r m u la P e r io d ic T a b le f o r B e n z e n o id H y d r o c a rb o n s a n d th e A u fb a u a n d E x c is e d I n te r n a l S tr u c tu r e C o n c e p ts in B e n z e n o id E n u m e ra tio n s The genesis of two concepts of recent importance to isomeric polyhex enumeration is traced. As it will become evident from this review, the philosophy of our approach stresses the enumeration of select benzenoid groups of practical interest to chemists. These concepts were pivotal to the first published enumerations of the strictly peri-condensed, non-Kekulean, and essentially strain-free total resonant sextet benzenoid groups. 
  Reference    Z. Naturforsch. 44a, 765—771 (1989); received March 10. 1989 
  Published    1989 
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 Identifier    ZNA-1989-44a-0765 
 Volume    44 
133Author    OskarE. Polansky, WalterM F FabianRequires cookie*
 Title      
 Abstract    Based on a projection operator formalism the pars orbital method is reformulated for the general case that both the molecule M as well as the reference molecule L-are described by a CI-expansion of the wave function. Some numerical examples in which the method is used for the interpretation of the ultraviolet spectra of simple organic molecules (butadiene, aniline, benzonitrile, o-, m-, and p-aminobenzonitrile, 2,5-diamino-p-benzoquinone) in terms of the various states (ground as well as excited) of the respective reference molecules are discussed in some detail to illustrate the scope and limitations of the proposed formalism. The results of these calculations are in addition compared to results obtained by two other methods (configuration analysis and specific measures of partial distances) designed to allow an analysis of molecules in terms of the constituent fragments. 
  Reference    Z. Naturforsch. 44a, 773 (1989); received May 27. 1989 
  Published    1989 
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 Identifier    ZNA-1989-44a-0773 
 Volume    44 
134Author    O. K., X-R, Issio, F. Burgäzy, C. Politis, S. P. Lamparter, SteebRequires cookie*
 Title      
 Abstract    The measured O K^ X-ray emission spectrum of the high-Tc superconductor Bi2Sr2CaCu20 8_x is compared with a spectrum based on local density band structure calculations. By taking also into account the shape of the measured O Is X-ray photoelectron spectrum an energy level diagram for the Ols core-level binding energies of the three different oxygen sites is constructed. The Ols binding energy in the Bi20 2-layers is found to be about the same as that one in the SrO-layers, whereas the binding energy in the Cu02-layers is lower by about 0.5 eV. 
  Reference    Z. Naturforsch. 44a, 780—784 (1989); received July 6 1989 
  Published    1989 
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 Identifier    ZNA-1989-44a-0780 
 Volume    44 
135Author    M. A. Osipov, E. M. TerentjevRequires cookie*
 Title      
 Abstract    The rotational diffusion of a rod-like molecule in a liquid crystal is considered in the molecular-field approximation, and the corresponding Fokker-Planck equation is derived. It is shown that the microscopic friction coefficient, which is the parameter of this equation, possesses the usual exponen­ tial temperature dependence with the activation energy determined by the isotropic part of the intermolecular interaction energy. The viscous stress tensor of the nematic is obtained by averaging of the corresponding microscopic expression with the non-equilibrium distribution function. Finally, explicit expressions for the Leslie coefficients are obtained in terms of molecular parameters. Their values, signs and temperature variation correspond qualitatively to experimental data. R o ta tio n a l D iffu sio n a n d R h e o lo g ic a l P r o p e r tie s o f L iq u id C r y s ta ls 
  Reference    Z. Naturforsch. 44a, 785—792 (1989); received November 23. 1988 
  Published    1989 
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 Identifier    ZNA-1989-44a-0785 
 Volume    44 
136Author    L. J. Gallego, J. A. Somoza, M. SilbertRequires cookie*
 Title    B h a tia  
 Abstract    -Y o u n g M o d e l C a lc u la tio n s o f th e T h e rm o d y n a m ic P ro p e rtie s o f T K E B S -B a s e d B in a ry L iq u id M ix tu r e s The simplified random phase approximation Bhatia-Young model has been used to evaluate the properties of mixing and the concentration fluctuations of the binary liquid mixtures of TKEBS with cyclohcxane. carbon tetrachloride and benzene. At this level of description the details of the poten­ tials are not important; only the values of the long-wavelength limit of the average effective ordering pair potential and its temperature derivative are required. In the three mixtures the constituent molecules are assumed to be globular in shape. 
  Reference    Z. Naturforsch. 44a, 793—800 (1989); received February 24 1989 
  Published    1989 
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 Identifier    ZNA-1989-44a-0793 
 Volume    44 
137Author    E. TrübenbacherRequires cookie*
 Title      
 Abstract    Using the concept of distributions, the square root of the operator — A + m2 is taken in a mathematically well defined way for one component wave functions. A new representation of proper Lorentz transformations for one component wave functions makes it possible to construct a relati-vistic quantum mechanics for spin 0, comprising a Lorentz invariant wave equation, a scalar product, and a positive definite density satisfying, together with a current, a continuity equation, and coupling of scalar and vector potentials. Some interesting consequences of the theory concerning the concept of particle trajectory and velocity of propagation of the probability amplitude are discussed in detail. As an example of practical application a perturbation theory for discrete states is set up. A L o re n tz I n v a r ia n t S c h rö d in g e r E q u a tio n fo r S p in 0 
  Reference    Z. Naturforsch. 44a, 801—810 (1989); received July 5 1988 
  Published    1989 
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 Identifier    ZNA-1989-44a-0801 
 Volume    44 
138Author    S. K. Bhattacharya, M. H. ThiemensRequires cookie*
 Title      
 Abstract    In a recent study, it was demonstrated that the mechanism associated with the O + CO reaction produces a large, mass independent isotopic fractionation in the product CO,. A kinetic treatment of the data demonstrated that isotopic exchange between the O atom, produced by O, photolysis and CO. occurred prior to the O + CO recombination. It was concluded that the likely source of the mass independent fractionation was the O -I-CO recombination. The present paper includes a kinetic evaluation of the added role of O -I-0 2, along with O -I-CO, isotopic exchange. The new determinations provide a better fit of the experimental data. E ffe c t o f I s o to p ic E x c h a n g e u p o n S y m m e try D e p e n d e n t F r a c tio n a tio n in th e O + C O C 0 2 R e a c tio n 
  Reference    Z. Naturforsch. 44a, 811 (1989); received June 13. 1989 
  Published    1989 
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 Identifier    ZNA-1989-44a-0811 
 Volume    44 
139Author    Y. Matsubara, Waseda, A. Inoue, H. Ohtera, T. MasumotoRequires cookie*
 Title     
 Abstract    The structure of a new amorphous Al87Y8Ni5, indicating high strength and good ductility, was studied by anomalous X-ray scattering (AXS). For comparison, a binary amorphous A190Y10 alloy was also investigated. The environmental radial distribution functions around Y and Ni as well as the ordinary RDF in the ternary alloy, and the environmental RDF around Y and the ordinary RDF in the binary alloy were determined. From the analysis of these RDFs it is found that the Y atoms are completely surrounded by Al in the binary alloy, and that some of these Al atoms are replaced by Ni atoms in the ternary alloy. A n o m a lo u s X -r a y S c a tte r in g on A m o rp h o u s A l87Y8N i 5 a n d A190Y10 A llo y s 
  Reference    Z. Naturforsch. 44a, 814—820 (1989); received December 15 1988 
  Published    1989 
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 Identifier    ZNA-1989-44a-0814 
 Volume    44 
140Author    J. KuśbaRequires cookie*
 Title     
 Abstract    ip o le -D ip o le T r a n s p o r t o f E x c ita tio n in L iq u id S o lu tio n s : In flu e n c e o f M u lti-S ta g e E n e rg y T r a n s fe r on D o n o r P h o to lu m in e s c e n c e Y ie ld On the basis of expressions obtained earlier, numerical calculations of relative donor quantum yields in the presence of multi-stage dipole-dipole energy transfer and material diffusion are carried out. Transfer rates of the second order obtained from the numerical solution of the diffusion equation with reflecting boundary conditions are used in the calculations. The results reflect the influence of donor and acceptor concentration, magnitude of diffusion coefficients and molecular size effects. 
  Reference    Z. Naturforsch. 44a, 821—824 (1989); received May 3 1989 
  Published    1989 
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 TEI-XML for    default:Reihe_A/44/ZNA-1989-44a-0821.pdf 
 Identifier    ZNA-1989-44a-0821 
 Volume    44 
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