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1982[X]
61Author    H. P. HinovRequires cookie*
 Title    Surface-Induced Flexoelectric Domains in Asymmetrically Strong-Weak Anchored MBBA Films  
 Abstract    The longitudinal surface-induced flexoelectric domains, previously obtained in symmetrically weak-anchored nematic layers have been further investigated in asymmetrically strong-weak anchored MBBA layers. The threshold voltages indicating the onset of the flexoelectric instabilities are high for thin cells (d = 9 pun, C7th = 10 V) and small for thick cells (d = 150 [i.m, f/th =1.5 V). Pronounced minima in the curves p vs. d and Uth vs. d, where p is the domain period and d is the cell thickness, were obtained. The flexoelectric domains were replaced by electrohydrodynamic instabilities only in the case of strong azimuthal anchoring of the liquid crystal layer. The role of the sign and the value of the dielectric anisotropy, the homogeneity of the electric field as well as the asymmetry in the surface anchoring are discussed in detail. 
  Reference    Z. Naturforsch. 37a, 334—341 (1982); received April 9 1981 
  Published    1982 
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 TEI-XML for    default:Reihe_A/37/ZNA-1982-37a-0334.pdf 
 Identifier    ZNA-1982-37a-0334 
 Volume    37 
62Author    J. Brunvoll, B. N. Cyvin, S. J. CyvinRequires cookie*
 Title    Potential Energy Distribution in the Presence of Redundancies  
 Abstract    A theory is outlined for the potential energy distribution in the presence of redundancies. Numerical examples are given for the cage-like molecules P4S3, P4Se3, ÄS4S3, As4Se3 and PAs3S3, for which the molecular vibrations have been analysed previously. 
  Reference    Z. Naturforsch. 37a, 342—345 (1982); received March 8 1982 
  Published    1982 
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 TEI-XML for    default:Reihe_A/37/ZNA-1982-37a-0342.pdf 
 Identifier    ZNA-1982-37a-0342 
 Volume    37 
63Author    H. Itoh, G. ErtlRequires cookie*
 Title    Molecular Orbital Calculations on the Interaction of PF3 and CO with Ni and Cu Atoms  
 Abstract    The interaction of Ni and Cu atoms with PF3 and CO ligands was investigated by means of ab initio MO calculations. Coupling occurs mainly through the HOMO (8ai for PF3 and 5 a for CO) levels with the metal 4s and 3dzz orbitals, if the 3d w_1 4s 1 electronic configuration of the metal atom is considered. The estimated M-PF3 bond lengths are 2.0 Ä for Ni and 2.5 A for Cu. Calcula-tions with Ni(3d 10) revealed for PF3 a more pronounced electron transfer to the ligand than for CO. The results are consistent with experimental UPS data for mononuclear complexes as well as corresponding adsorption systems. In particular, split-off d-states observed in UPS data for adsorbed PF3 are attributed to the pronounced lowering of the 3d-orbital energy of the metal atom upon interaction with this electropositive ligand. 
  Reference    Z. Naturforsch. 37a, 346—352 (1982); received March 11 1982 
  Published    1982 
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 TEI-XML for    default:Reihe_A/37/ZNA-1982-37a-0346.pdf 
 Identifier    ZNA-1982-37a-0346 
 Volume    37 
64Author    D. Repenning, R. Schumacher, R. N. SchindlerRequires cookie*
 Title    The Influence of Contact Adsorbed Ions on the Photoelectrochemical Behaviour of a-HgS  
 Abstract    Results are reported to describe the influence of additives on the photoelectrochemical prop-erties of the liquid junction a-HgS/electrolyte. The semiconductor electrodes were prepared by sublimation of a-HgS on Au substrates. The electrolyte was modified by additives such as CU, Br~, J*", and CN~ ions. It was found that these anions play an important role in determining the flat band Ffb and the transition potential \\T. Generally, both the nature and the concentration of the additives affect Fn> and Ftr-The results are interpreted in terms of contact adsorption of the used anions. It is further indicated that the adsorptive properties can be correlated to a possible chemical reaction of mercury cations with halide anions to form insoluble layers at the surface. 
  Reference    Z. Naturforsch. 37a, 353—357 (1982); received December 8 1981 
  Published    1982 
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 TEI-XML for    default:Reihe_A/37/ZNA-1982-37a-0353.pdf 
 Identifier    ZNA-1982-37a-0353 
 Volume    37 
65Author    H. MäderRequires cookie*
 Title    Investigation of Self-and Foreign Gas Collision-induced Transitions between M-resolved Rotational Levels of OCS  
 Abstract    Four-level MW-MW double resonance experiments on rotational Stark levels j = 0, 1, 2 and 3 of OCS have been performed to investigate transfer of rotational energy by collisions of OCS with OCS, He, Ne, Ar, Kr, H2, N2, O2, and CH3F. Theoretical arguments are given for the inter-pretation of the experimentally determined ^-values by considering Bloch-type equations of an "embedded" four-level system with ±M degeneracy of the energy levels. The results indicate significant deviations from first order dipole collisional interaction. 
  Reference    Z. Naturforsch. 37a, 358—370 (1982); received February 19 1982 
  Published    1982 
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 TEI-XML for    default:Reihe_A/37/ZNA-1982-37a-0358.pdf 
 Identifier    ZNA-1982-37a-0358 
 Volume    37 
66Author    E. Ibisch, U. AndresenRequires cookie*
 Title    Infrared Microwave Double-Resonance Investigations on Trifluoromethyljodide (CF3I)  
 Abstract    An additional set of infrared microwave double-resonance signals was observed using the 9 ft 12 line of the CO2 laser. The vibrational transition involved is assigned to the Q Qs(8) transition of the x'i-fundamental. AJ = 1, K = 5 rotational transitions were found for J = 5, 6, 7, and 8 in both vibrational states. A detailed description of the apparatus and methods is given. 
  Reference    Z. Naturforsch. 37a, 371—375 (1982); received March 20 1982 
  Published    1982 
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 TEI-XML for    default:Reihe_A/37/ZNA-1982-37a-0371.pdf 
 Identifier    ZNA-1982-37a-0371 
 Volume    37 
67Author    Burkhardt Jahn, Herbert DreeskampRequires cookie*
 Title    Die Valenzisomerisierung des 9.10-Dewarisomers zum 9-t-Butylanthrazen  
 Abstract    Valence Isomerization of the 9,10-Dewar-Isomer to 9-t-Butylanthracene By DTA calorimetry the enthalpy of valence isomerization of l-t-butyl-dibenzo-2,5-bicyclo-(2,2,0)-hexadiene (9-t-butyl-9,10-Dewar-anthracene) 2 to 9-t-butylanthracene 1 has been deter-mined as —172±5 kJ mol -1 in decaline at 350 K. Photochemically the isomerization 2->l occurs with the high quantum yield of 0R^O.4 in contrast to the low quantum yield of the reverse photo-isomerization l->2 of 0R = 0.016 [5]. Since other meso-substituted anthracenes, e.g. 9-methyl-anthracene or 9-trimethylsilyl-anthracene do not photoreact to Dewar-isomers, it is concluded that a deformation of the anthracene sceleton is a prerequisite for this type of valence isomerization. 
  Reference    Z. Naturforsch. 37a, 376—379 (1982); eingegangen am 23. Februar 1982 
  Published    1982 
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 TEI-XML for    default:Reihe_A/37/ZNA-1982-37a-0376.pdf 
 Identifier    ZNA-1982-37a-0376 
 Volume    37 
68Author    EnriqueJ. Baran, AraceliE. LavatRequires cookie*
 Title    Schwingungseigenschaften des P04 3 -Ions im Monazit-und Zirkon-Gitter  
 Abstract    The force constants and mean amplitudes of vibration for the PO4 3 " ion present in the lattices of the rare earth orthophosphates of the monazite and zircon types, have been calculated from recently reported Raman data. It is shown that the P—0 bond strength depends not only on the overall unit cell contraction but also on the structural type. Vor kurzem haben Begun et al. die Raman-Spek-tren der Orthophosphate der Seltenen Erden ge-messen und gedeutet [1]. Diese Untersuchung bot eine weitere Gelegenheit, den Einfluß der dreiwerti-gen Lanthanide auf innere Anionenschwingungen zu analysieren sowie unsere früheren Ergebnisse bei Orthovanadaten der Seltenen Erden [2, 3], an Hand einer anderen Reihe von Verbindungen zu bestätigen. Die Orthophosphate der Seltenen Erden treten, bekanntlich, in zwei Strukturtypen auf: diejenigen der größeren Lanthaniden (La bis Gd) kristallisieren im monoklinen Monazit-Gitter, und die restlichen (Tb bis Lu) in der tetragonalen Zirkon-Struktur [4, 5]. TbP04 ist zwar dimorph, die Zirkonform ist aber die stabilere der beiden Modifikationen [4-6]. Die qualitative Betrachtung der spektroskopi-schen Daten der gesamten Phosphat-Reihe zeigt, daß im allgemeinen mit Zunahme der Atomzahl des Lanthanid-Ions praktisch alle Schwingungsfre-quenzen ansteigen und außerdem ergeben sich je-weils zwei deutlich getrennte Frequenzgruppen die anscheinend durch die verschiedene Kristallstruktur bedingt sind [1]. In erster Näherung entsprechen also die Ver-hältnisse bei diesen Verbindungen denjenigen der Orthovandate bei welchen auch ein allgemeiner Frequenzanstieg mit zunehmender Atomzahl des Kations beobachtet wurde [2, 3]. Dieser verläuft aber regelmäßiger, da alle gemessenen 
  Reference    Z. Naturforsch. 37a, 380—382 (1982); eingegangen am 22. Februar 1982 
  Published    1982 
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 TEI-XML for    default:Reihe_A/37/ZNA-1982-37a-0380.pdf 
 Identifier    ZNA-1982-37a-0380 
 Volume    37 
69Author    D. Gloyna, I. A. Kawski, GryczyńskiRequires cookie*
 Title    Viskositätsabhängigkeit der Fluoreszenzquantenausbeute von Donator-Akzeptor-substituierten trans-Stilbenen in unpolaren wenig viskosen Lösungsmitteln  
 Abstract    Fluorescence quantum yields, <pt, of donor-acceptor substituted trans-stilbenes, 1, in n-heptane and toluene depend upon the solvent dynamic viscosity t) according to the relation ln(gpf -1 — 1) = a ln(f? -1)-f&. By changing the temperature (278 < T<343 K) the viscosity was varied. The viscosity dependence of cpt can be accounted for by a corresponding viscosity depending radia-tions less deactivation of the Si state, which in low solutions is first of all determined by the intramolecular donor-acceptor and universal intermolecular solute-solvent interactions, and then by viscosity. 
  Reference    Z. Naturforsch. 37a, 383 (1982); eingegangen am 24. Februar 1982 
  Published    1982 
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 TEI-XML for    default:Reihe_A/37/ZNA-1982-37a-0383.pdf 
 Identifier    ZNA-1982-37a-0383 
 Volume    37 
70Author    Andrzej KowalskiRequires cookie*
 Title    Absolute Cross Sections for the Chemiluminescent and Chemiionizing Reactions Mg*( 3 P), Ca*( 3 P) + SOCl2  
 Abstract    The absolute cross sections for different electronic exit channels for the reactions Mg*(3 P), Ca*(3 P) + SOCI2 were measured in a beam-gas experiment. The chemiluminescence and chemi-ionization yields measured are low (total 2%) but equal or are even higher for some channels than those calculated from a statistical model. 
  Reference    Z. Naturforsch. 37a, 387—389 (1982); received March 1 1982 
  Published    1982 
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 TEI-XML for    default:Reihe_A/37/ZNA-1982-37a-0387.pdf 
 Identifier    ZNA-1982-37a-0387 
 Volume    37 
71Author    FayezY. Khalil, F. M. Abdel-Halim, AdelN. AsaadRequires cookie*
 Title    Kinetics of Acid-Catalysed Hydrolysis of Diethylsuccinate in Dioxane-Water Mixtures  
 Abstract    The specific rate constants ki and ko of the consecutive first-order acid-catalysed hydrolysis steps of diethylsuccinate in dioxane-water mixtures covering the range 0—95% (w/w) of dioxane are determined at 25—55 °C. As the concentration of dioxane increases, the rate of the reaction decreases to a minimum at about 90% (w/w) dioxane, after which it increases again. The ratio &1/&2 was found to be almost constant at the value 2.0. The activation energies of the reaction are independent of solvent composition. Available electrostatic theories regarding the effect of the dielectric constant on the rate are presented, from which the reaction is shown to be an ion-molecular dipole type of interaction. The thermodynamic parameters and the radii of the activated complex at different solvent compositions are calculated and discussed. 
  Reference    Z. Naturforsch. 37a, 390—394 (1982); received September 28 1981 
  Published    1982 
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 TEI-XML for    default:Reihe_A/37/ZNA-1982-37a-0390.pdf 
 Identifier    ZNA-1982-37a-0390 
 Volume    37 
72Author    E. Ibisch, U. AndresenRequires cookie*
 Title    Infrared-Radio-Frequency Two-Photon Investigations on Deutero-Fluoroform (CDF3)  
 Abstract    Some rotation-vibration transitions of the 1'5-band of Deutero-Fluoroform using the infrared-radio-frequency two-photon technique are reported. An absorption cell for infrared-radio-frequency or infrared-microwave two-photon and double-resonance measurements inside a CO2 laser cavity is described. This type of cell may be used in a wide frequency range. 
  Reference    Z. Naturforsch. 37a, 395 (1982); received March 31 1982 
  Published    1982 
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 TEI-XML for    default:Reihe_A/37/ZNA-1982-37a-0395.pdf 
 Identifier    ZNA-1982-37a-0395 
 Volume    37 
73Author    R. Mclaughlin, Max WolfsbergRequires cookie*
 Title    Don  
 Abstract    A variational calculation of the lower-lying vibrational energy levels of the ammonia molecule is performed, in which all six vibrational degrees of freedom are treated simultaneously. A literature potential is assumed for all non-inversion motions; a new inversion barrier potential with a barrier of 1616 cm -1 is determined by fitting ex-perimental data. 
  Reference    Z. Naturforsch. 37a, 398—400 (1982); received February 11 1982 
  Published    1982 
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 TEI-XML for    default:Reihe_A/37/ZNA-1982-37a-0398_n.pdf 
 Identifier    ZNA-1982-37a-0398_n 
 Volume    37 
74Author    Torgny SjödinRequires cookie*
 Title    On the Behaviour of Light in a Spherically Symmetric Aether Field  
 Abstract    The formulae for the bending of light and retardation of light signals near point masses are obtained in a very simple and natural way making use of classical optics. This is accomplished by characterizing the aether density in each point through a refraction index and assuming that the velocity of light is inversely proportional to this index. The results agree with General Relativity and with made ex-periments. 
  Reference    Z. Naturforsch. 37a, 401—402 (1982); received March 23 1982 
  Published    1982 
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 TEI-XML for    default:Reihe_A/37/ZNA-1982-37a-0401_n.pdf 
 Identifier    ZNA-1982-37a-0401_n 
 Volume    37 
75Author    B. Jenichen, R. Köhler, W. MöhlingRequires cookie*
 Title    Checking Plane Wave Approximation for Double Crystal Topography with Curved Samples  
 Abstract    The double crystal diffracto meter in n,-n position realizes plane wave conditions only approxi-mately. Nevertheless topographs taken with such arrangements are usually interpreted on the basis of contrast simulations starting with plane waves. Observations of diffraction patterns ob-tained with curved samples in an n,-n setting have lead us to study the validity of such a treat-ment. Simulations made for different types of the starting wave actually show that plane waves are adequate even in that critical case. However for a full coincidence between simulation and experiment it proved necessary to account for the residual angular spread within the collimated beam by averaging several plane wave simulations. 
  Reference    Z. Naturforsch. 37a, 405—410 (1982); received December 10 1981 
  Published    1982 
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 TEI-XML for    default:Reihe_A/37/ZNA-1982-37a-0405.pdf 
 Identifier    ZNA-1982-37a-0405 
 Volume    37 
76Author    Yasuharu Yoneda, Yoshinori ChikauraRequires cookie*
 Title    Polycrystal Scattering Topography, Scattering Tomography and their Perspective Fields of Application  
 Abstract    A concept of X-ray topography for polycrystal line materials has been proposed. In this method X-rays scattered from a specimen produce the image. Various techniques for this kind of topo-graphy are described and their characteristic features are pointed out; some of these techniques offer the possibility to make tomographic observations. The new topographic method has been applied to the observation of commercially used alu-minium sheet and of wood (cedar). The discussion is extended to mechanisms of the image forma-tion and the perspective fields of application. 
  Reference    Z. Naturforsch. 37a, 412—418 (1982); received December 18 1981 
  Published    1982 
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 TEI-XML for    default:Reihe_A/37/ZNA-1982-37a-0412.pdf 
 Identifier    ZNA-1982-37a-0412 
 Volume    37 
77Author    M. Polcarová, J. BrádlerRequires cookie*
 Title    Theoretical and Experimental Study of the Diffraction Contrast on Magnetic Domain Walls  
 Abstract    Dynamical theory of the X-ray diffraction on a crystal containing misfit boundary was applied to the interpretation of the contrast observed in X-ray topographs on 90° magnetic domain walls in single crystals of an Fe-Si alloy. The integrated intensities were computed for several cases corresponding to the actual conditions of experiments. Good agreement of theoretical and experi-mental results was obtained. 
  Reference    Z. Naturforsch. 37a, 419—426 (1982); received December 23 1981 
  Published    1982 
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 TEI-XML for    default:Reihe_A/37/ZNA-1982-37a-0419.pdf 
 Identifier    ZNA-1982-37a-0419 
 Volume    37 
78Author    R. Bonse, TeworteRequires cookie*
 Title     
 Abstract    A spherical wave theory is given for the calculation of the observed fine structure of Laue case rocking curves [1 — 3] of a pair of perfect crystals. It is shown that under the experimental condition of measuring simultaneously the full width of outgoing beams, the simple plane wave theory presented previously [1] yields identical results. 
  Reference    Z. Naturforsch. 37a, 427—432 (1982); received January 4 1982 
  Published    1982 
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 TEI-XML for    default:Reihe_A/37/ZNA-1982-37a-0427.pdf 
 Identifier    ZNA-1982-37a-0427 
 Volume    37 
79Author    J. Burgeat, R. Caciuffo, J. Primot, F. RustichelliRequires cookie*
 Title    Oxidation Induced Anisotropic Deformation in Perfect Si Crystals. Dynamical X-Ray Diffraction Study  
 Abstract    Double X-ray diffractometry has been used to investigate perfect Si crystals of different orientations, on which SiC>2 layers of different thickness were grown. For the (111) and (110) orientations no appreciable modification of the theoretical diffraction pattern is observed. An important modification, which depends on the SiC>2 thickness, appears however for the (100) orientation. The observed effect does not change when the SiC>2 is removed and can be interpreted as an enhancement of the lattice parameter. 
  Reference    Z. Naturforsch. 37a, 433—436 (1982); received January 22 1982 
  Published    1982 
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 TEI-XML for    default:Reihe_A/37/ZNA-1982-37a-0433.pdf 
 Identifier    ZNA-1982-37a-0433 
 Volume    37 
80Author    Roberto ColellaRequires cookie*
 Title    Multiple Diffraction of X-Rays  
 Abstract    The phenomenon of n-beam diffraction (n> 2) is discussed with particular attention being devoted to the Bragg case of diffraction. The general method of solution is outlined, and some applications to specific situations are discussed. These include experiments in which strong quasi-monochromatic phonon beams are excited in a crystal using the Acousto-Electric effect, phase determination using the concept of "Virtual Bragg Scattering", and high resolution Bragg reflec-tion topographs. In all cases the agreement between theory and experiment has been found excellent. 
  Reference    Z. Naturforsch. 37a, 437—447 (1982); received January 22 1982 
  Published    1982 
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 TEI-XML for    default:Reihe_A/37/ZNA-1982-37a-0437.pdf 
 Identifier    ZNA-1982-37a-0437 
 Volume    37 
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