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1983[X]
81Author    A. Kawski, M. AlickaRequires cookie*
 Title    Relaxation Time Studies of Excited Oxido-Substituted p-Oligophenylenes in Different Solvents  
 Abstract    Effective volumes, moments of inertia and Debye relaxation times in the excited state were determined for some oxido-substituted p-oligophenylenes by the method of fluorescence depolarization in nonpolar and polar solvents of different viscosities. 
  Reference    Z. Naturforsch. 38a, 520—523 (1983); received October 25 1982 
  Published    1983 
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 TEI-XML for    default:Reihe_A/38/ZNA-1983-38a-0520.pdf 
 Identifier    ZNA-1983-38a-0520 
 Volume    38 
82Author    F. H. Abd, El-Kader, M. S. Abd El-FattahRequires cookie*
 Title    Kinetic Energy Release and Energy Partitioning During the Ionic Fragmentation in Metastable Ions  
 Abstract    The kinetic energy released in the unimolecular decomposition of some metastable transitions has been investigated. It was found to have a significant temperature dependence in cases of PF loss from molecular ions. This is attributed to the tunelling of FF atom through the centrifugal barrier. The activation energies of the reverse reactions "e*" and the kinetic energy released "7b" have been determined for the loss of H" from acetonitrile and elimination of HCN from benzonitrile. The partitioning energy quotients q = T B /s* are found = 0.91 and 0.58 for acetonitrile and benzonitrile respectively. 
  Reference    Z. Naturforsch. 38a, 524—527 (1983); received November 19. 1982 
  Published    1983 
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 TEI-XML for    default:Reihe_A/38/ZNA-1983-38a-0524.pdf 
 Identifier    ZNA-1983-38a-0524 
 Volume    38 
83Author    M. Buback, A. A. HarfoushRequires cookie*
 Title    Near Infrared Absorption of Pure n-Heptane between 5000 cm 1 and 6500 em -1 to High Pressures and Temperatures  
 Abstract    The near infrared absorption of pure n-heptane between 5000 cm -1 and 6500 cm -1 was measured up to 250 °C and to pressures of 2000 bar. The procedure for measuring vibrational intensities at high pressures and temperatures with a precision of better than ± 1% is described. The integrated molar absorptivity of the combination mode v a + v s of the methylene stretching fundamentals turns out to be independent of temperature and density. This offers important applications for high-pressure high-temperature thermodynamic and kinetic studies via quanti-tative near infrared spectroscopy. 
  Reference    Z. Naturforsch. 38a, 528—532 (1983); received February 6 1983 
  Published    1983 
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 TEI-XML for    default:Reihe_A/38/ZNA-1983-38a-0528.pdf 
 Identifier    ZNA-1983-38a-0528 
 Volume    38 
84Author    R. Caminiti, P. Cucca, A. D 'andreaRequires cookie*
 Title    Hydration Phenomena in a Concentrated Aqueous Solution ofCe(NC>3)3. X-ray Diffraction and Raman Spectroscopy  
 Abstract    The scattering of X-rays from a concentrated Ce(N0 3) 3 aqueous solution has been measured and analyzed. The experimental correlation function appears to be mainly characterized by the hydration of the cation: peaks at about 2.55 and 4.65 A. Good agreement with experimental data is achieved through a model in which the Ce(III) ions have a first and a second hydration shell and also the nitrate group is considered hydrated. Complex formation between cation and anion is confirmed by using Raman spectroscopy. 
  Reference    Z. Naturforsch. 38a, 533—539 (1983); received February 3 1983 
  Published    1983 
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 TEI-XML for    default:Reihe_A/38/ZNA-1983-38a-0533.pdf 
 Identifier    ZNA-1983-38a-0533 
 Volume    38 
85Author    Czeslaw RudowiczRequires cookie*
 Title    Magnetocrystalline Anisotropy of 3d 6 and 3d 4 Ions at Triclinic Symmetry Sites Application to Fe 2+ Ions in YIG: Me 4+ (Me = Si, Ge)  
 Abstract    The earlier suggested energy-level model based on an orbital singlet ground state for 3d 6 and 3d 4 ions at trigonal sites with large triclinic distortion is adopted to develop the single-ion theory of magnetic anisotropy. The Hamiltonian consisting of eight spin Hamiltonian terms and the molecular field is solved by perturbation theory. The resulting energies E Ms with M s = 0. ± 1, ± 2 are applied to calculate the free energy for Fe 2+ ions in Si-or Ge-substituted yttrium iron garnets where a uniform distribution of Fe 2+ ions over the 12 inequivalent sites is assumed. It turns out that the first two cubic anisotropy constants K ] and K 2 are insufficient to describe the anisotropy at high temperatures in the present model. By a least-squares method it is established that the anisotropy expansion series can be terminated at the fourth-order term for the present model. Thus K\, K 2 , and K 4 are derived analytically in terms of the free energy for some choosen directions of magnetization. The analytical results agree very well with the correspond-ing ones obtained by the least-squares method. The temperature dependence of K h i= 1, 2, 3, and 4, is calculated for a wide range of the spin Hamiltonian parameters (Band the molecular field (/?). The theoretical K\ and K 2 are fitted to the experimental values of K\ and K 2 at low temperatures obtained by neglecting the higher-order anisotropy terms, to get the values of B (q k) and h for YIG: Si and YIG:Ge. A comparison of the present results with the corresponding ones of the previous doublet model, is also discussed. The theoretical account of the experimentally observed temperature dependence of the ratio K 2 /K\ for Fe 2+ in YIG:Ge speak in favour of the present model rather than the doublet model. The change in sign of A", observed for Fe :+ in YIG:Si. which could not be explained by the doublet model with uniform distribu-tion of Fe 2+ ions, is well accounted for by the present model. The recently observed spin reorientation in YIG: Si can also be explained by the present model without resorting to a nonuniform distribution of Fe 2+ ions required by the previous model. This study indicates that the higher-order constants K } and K 4 are significant at high temperatures according to the present model, whereas at low temperatures according to the doublet model. Hence an experimental determination of and K 4 over a wide temperature range may provide a test of the applicability of the two models. 
  Reference    Z. Naturforsch. 38a, 540—554 (1983); received August 25 1982 
  Published    1983 
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 TEI-XML for    default:Reihe_A/38/ZNA-1983-38a-0540.pdf 
 Identifier    ZNA-1983-38a-0540 
 Volume    38 
86Author    Robert Becker, Wolfgang Brockner, Claus WibbelmannRequires cookie*
 Title    Sehwingungsspektren von Sn 2 P2S 6  
 Abstract    Vibrational Spectra of Sn 2 Pißt, Far infrared, infrared and Raman spectra of tin hexathiohypodiphosphate Sn 2 P 2 S 6 (mono-clinic modification II) have been recorded. The observed frequencies are assigned on the basis of P 2 S6~ units with C 2h symmetry in the crystal. The assignment is supported by the correlation D 3d (dissolved PiSJ--ion) -» • C 2h . DTA-data have been determined and interpreted. 
  Reference    Z. Naturforsch. 38a, 555—558 (1983); eingegangen 5. Februar 1983 
  Published    1983 
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 TEI-XML for    default:Reihe_A/38/ZNA-1983-38a-0555.pdf 
 Identifier    ZNA-1983-38a-0555 
 Volume    38 
87Author    G. Licheri, G. Pinna, G. Navarra, G. VlaicRequires cookie*
 Title    EXAFS Study of Ni 2+ Coordination in Nitrate Solutions  
 Abstract    Four aqueous solutions of Ni(N0 3) 2 of concentrations ranging from 0.5 M to 4.0 M were examined by the EXAFS technique. The isolation and analysis of of the peak corresponding to the first coordination shell of the metal ion shows that the Ni 2+ ion is surrounded by about 6 water molecules at a distance of about 2.06 A. 
  Reference    Z. Naturforsch. 38a, 559—562 (1983); received January 24 1983 
  Published    1983 
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 TEI-XML for    default:Reihe_A/38/ZNA-1983-38a-0559.pdf 
 Identifier    ZNA-1983-38a-0559 
 Volume    38 
88Author    EnriqueJ. Baran, CarmenI. CabelloRequires cookie*
 Title    Schwingungseigenschaften der Tetrahalogenooxotechnetate (V)  
 Abstract    A complete assignment of previously reported vibrational spectra of the TcOX; (X = CI, Br, I) anions is proposed. Based on this assignment, force constants and mean amplitudes of vibration are evaluated and the most prominent aspects of the vibrational behaviour and structural charac-teristics of these species are discussed. 
  Reference    Z. Naturforsch. 38a, 563—565 (1983); eingegangen am 20. Dezember 1983 
  Published    1983 
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 TEI-XML for    default:Reihe_A/38/ZNA-1983-38a-0563.pdf 
 Identifier    ZNA-1983-38a-0563 
 Volume    38 
89Author    Walter FabianRequires cookie*
 Title    Theoretische Untersuchungen zum Absorptionsverhalten von Hydroxyindolen  
 Abstract    The absorption spectra of hydroxyindoles are calculated by means of the PPP and INDO/S-CI methods. The results of the PPP calculations are analyzed in terms of molecular subunits using the parsorbital method, similarity measure and configuration analysis. These methods show that the electronic states of the hydroxyindoles are best described by fragmentation in indole + hydroxyl groups. On the basis of this fragmentation the bathochromic shift of the first absorption band of 5-and 6-hydroxyindole as compared to 4-and 7-hydroxyindole and indole itself can be explained by the contribution of the charge transfer configuration from the hydroxyl group to the locally excited indole state. 
  Reference    Z. Naturforsch. 38a, 566—569 (1983); eingegangen am 19. September 1982 
  Published    1983 
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 TEI-XML for    default:Reihe_A/38/ZNA-1983-38a-0566.pdf 
 Identifier    ZNA-1983-38a-0566 
 Volume    38 
90Author    Volker Fischer, Klaus Werner Bühler, SchefflerRequires cookie*
 Title    ESR-Untersuchung zur N-Inversion an freien Radikalen  
 Abstract    eingegangen am 10. Februar 1983 N-Inversion in Free Radical Molecules Studied by ESR The temperature dependence of the ESR spectra of 4-[(Mono-rsp. Di-organyl-amino)-methyl]-2.6-di-tert.-butyl-phenoxyls is studied. The observed coalescence behaviour of the hfs-parameters of the methylene protons is interpreted by N-inversion in the amine group. Thus it is shown that the psec time scale of ESR makes it possible to study these processes near ambient temperatures. Evaluation of rate constants and activation parameters was done by computer simulation of the DESR spectra. Comparing these values with those given by DNMR methods at low temperatures show that the radical state of the molecule has no significant effect on the inversion rate constants. 
  Reference    Z. Naturforsch. 38a, 570—578 (1983) 
  Published    1983 
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 TEI-XML for    default:Reihe_A/38/ZNA-1983-38a-0570.pdf 
 Identifier    ZNA-1983-38a-0570 
 Volume    38 
91Author    George Ritzoulis, Nikolaos Papadopoulos, Vasilios Galiatsatos, Danae Christodoulou, Dimitrios JannakoudakisRequires cookie*
 Title    Dissociation of 2,4-Dinitrobenzoic Acid and D-10-Camphosulfonic Acid in Water-Methanol Mixtures at 25 °C  
 Abstract    The dissociation constants and the equivalent conductances of 2,4-dinitrobenzoic acid and D-10-camphosulfonic acid have been determined in water-methanol mixtures at 25 °C. The experimental data have been analyzed with the "Fuoss 78" conductance equation. The Bjerrum critical distance was accepted instead of Gurney's cosphere diameter. Values of K A and A 0 are reported. 
  Reference    Z. Naturforsch. 38a, 579—582 (1983); received October 30 1982 
  Published    1983 
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 TEI-XML for    default:Reihe_A/38/ZNA-1983-38a-0579.pdf 
 Identifier    ZNA-1983-38a-0579 
 Volume    38 
92Author    Goodarz AhmadiRequires cookie*
 Title    Application of Wiener-Hermite Expansion to Strong Plasma Turbulence  
 Abstract    A Wiener-Hermite set of statistically orthogonal random functions in phase space is introduced for investigation of electrostatic plasma turbulence. Expansions of the random distribution functions in terms of the random base are considered and the equations governing the dynamics of the deterministic Wiener-Hermite Kernels are derived. 
  Reference    Z. Naturforsch. 38a, 583—584 (1983); received March 8 1983 * 
  Published    1983 
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 TEI-XML for    default:Reihe_A/38/ZNA-1983-38a-0583_n.pdf 
 Identifier    ZNA-1983-38a-0583_n 
 Volume    38 
93Author    W. Kasten, H. Dreizler, R. SchwarzRequires cookie*
 Title    Quadrupole Coupling in the Microwave Spectrum of Ethylisothiocyanate An Application of Microwave Fourier Transform Spectroscopy  
 Abstract    We investigated the microwave spectrum of ethyliso-thiocyanate, CH 3 CH 2 NCS, for the nitrogen quadrupole coupling. The spectrum was first measured and assigned by Sakaizumi. Ohashi, and Yamaguchi [1], By comparing the measured rotational constants with those resulting from an assumed structure they concluded that the synperi-planar (eis) form was measured. 
  Reference    Z. Naturforsch. 38a, 585—586 (1983); received March 12 1983 
  Published    1983 
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 TEI-XML for    default:Reihe_A/38/ZNA-1983-38a-0585_n.pdf 
 Identifier    ZNA-1983-38a-0585_n 
 Volume    38 
94Author    W. E. Stręk, B. -Łukowiak, Jeżowska-TrzebiatowskaRequires cookie*
 Title    Observation of Antiresonanees in Fluorescence Spectra of Cr +1 and Nd +1 Doped Glasses  
 Abstract    The fluorescence spectra of Cr +3 in the presence of Nd +3 in glasses were studied. The "dips" observed in the spectra are interpreted as antiresonanees due to Cr-Nd in-teraction. 
  Reference    Z. Naturforsch. 38a, 587—588 (1983); received December 11 1982 
  Published    1983 
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 TEI-XML for    default:Reihe_A/38/ZNA-1983-38a-0587_n.pdf 
 Identifier    ZNA-1983-38a-0587_n 
 Volume    38 
95Author    Nikola Getoff, Michaela PruchaRequires cookie*
 Title    Spectroscopic and Kinetic Characteristics of HÖ 2 and ÖI Species Studied by Pulse Radiolysis  
 Abstract    The formation and decay of H0 2 and 0 2 transients was reinvestigated using oxygenated aqueous t-butanol solutions in the pH range from 1.5 to about 8. The ob-tained spectroscopic and kinetic characteristics of both superoxide radical forms are: for HÖ 2 / max = 230 nm (e 23 o= 130 m 2 moF 1), 2 k (H_6 2 + H0 2) = (3.7 ± 0.2) x 10 6 dm-mol -1 s -1 , and for Ö 2 /. max = 245 nm (£ 245 = 215 m 2 moU 1), 2 k (Ö 2 + 0 2) < 10 dm 3 mol" 1 s _l . 
  Reference    Z. Naturforsch. 38a, 589—590 (1983); received January 20 1983 
  Published    1983 
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 TEI-XML for    default:Reihe_A/38/ZNA-1983-38a-0589_n.pdf 
 Identifier    ZNA-1983-38a-0589_n 
 Volume    38 
96Author    Rudolf Nolte, Albert Seibert, Wolfhart SeidelRequires cookie*
 Title    Photodissoziation von CH2J2 und CHJ 3 bei 298 nm  
 Abstract    Photofragmentation of CH 2 J 2 and CHJ 3 by a pulsed laser beam (/ = 298 nm) was analysed with respect to the fragment energies (TOF distribution). From the angular distribution of the fragments shape factors b were deter-mined. 
  Reference    Z. Naturforsch. 38a, 591—592 (1983) 
  Published    1983 
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 TEI-XML for    default:Reihe_A/38/ZNA-1983-38a-0591_n.pdf 
 Identifier    ZNA-1983-38a-0591_n 
 Volume    38 
97Author    W. D. Basier, I. V. Murin, S. V. ChernovRequires cookie*
 Title    Fluorine Diffusion and Phase Transition in Superionic Conductor KSn 2 F 5 as Studied by l9 F NMR, Electrical Conductivity and DSC  
 Abstract    The diffusion of fluorine in KSn 2 F 5 has been studied by 7*| and 7* 2 relaxation time measurements of 19 F NMR (200-500 K) and pulsed magnetic field gradient tech-niques (390-480 K). Near 423 K. a sharp transition into the superionic state has been found, the fluorine diffusion increasing by a factor of 4 within a range of 3 K. Conduc-tivity measurements only show a change in the activation energy. 
  Reference    Z. Naturforsch. 38a, 593—594 (1983); received February 19 1983 
  Published    1983 
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 TEI-XML for    default:Reihe_A/38/ZNA-1983-38a-0593_n.pdf 
 Identifier    ZNA-1983-38a-0593_n 
 Volume    38 
98Author    Myriam Segre De Giambiagi, Mario GiambiagiRequires cookie*
 Title    Some Features of Excited States Density Matrix Calculation and Their Pairing Relations in Conjugated Systems  
 Abstract    Direct PPP-type calculations of self-consistent (SC) density matrices for excited states are described and the corresponding "thawn" molecular orbitals (MO) are discussed. Special atten-tion is addressed to particular solutions arising in conjugated systems of a certain symmetry, and to their chemical implications. The U(2) and (7(3) algebras are applied, respectively, to the 4-electron and 6-electron cases; a natural separation of excited states in different cases follows. A simple approach to the convergence problem for excited states is given. The complementarity relations, an alternative formulation of the pairing theorem valid for heteromolecules and non-alternant systems, allow some fruitful experimental applications. Together with the extended pairing relations shown here, they may help to rationalize general trends. 
  Reference    Z. Naturforsch. 38a, 595—600 (1983); received February 8 1983 
  Published    1983 
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 TEI-XML for    default:Reihe_A/38/ZNA-1983-38a-0595.pdf 
 Identifier    ZNA-1983-38a-0595 
 Volume    38 
99Author    H. K. WimmelRequires cookie*
 Title    Lagrangian Formulation of a Consistent Relativistic Guiding Center Theory  
 Abstract    A new relativistic guiding center mechanics is presented that conserves energy (in time-indpendent Fields) and satisfies a Liouville's theorem. The theory reduces to Littlejohn's theory in the non-relativistic limit and agrees to leading orders in e = r g /L with the relativistic theory by Morozov and Solov'ev (which generally lacks a Liouville's theorem). The new theory is developed from an appropriate Lagrangian and is supplemented by a collisionless relativistic kinetic equation for the guiding centers. Moment equations for guiding center density and energy density are also derived. 
  Reference    Z. Naturforsch. 38a, 601—607 (1983); received February 25 1983 
  Published    1983 
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 TEI-XML for    default:Reihe_A/38/ZNA-1983-38a-0601.pdf 
 Identifier    ZNA-1983-38a-0601 
 Volume    38 
100Author    M. Čerček, R. TavzesRequires cookie*
 Title    Ion-Acoustic Wave Radiation from a Point Source in a Streaming Magnetoplasma  
 Abstract    We report theoretical and experimental results on the radiation pattern of the ion acoustic waves below the ion cyclotron frequency from a small probe in a streaming magnetoplasma. In the fluid approximation with cold ions the ion acoustic resonance cones are found to be drastically changed. Experimental ray velocities and constant phase surfaces are in good agreement with the theoretical results. 
  Reference    Z. Naturforsch. 38a, 608—615 (1983); received January 20 1983 
  Published    1983 
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 TEI-XML for    default:Reihe_A/38/ZNA-1983-38a-0608.pdf 
 Identifier    ZNA-1983-38a-0608 
 Volume    38 
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