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1980[X]
101Author    Levente SzaszRequires cookie*
 Title    X a Method with Pseudopotentials  
 Abstract    The la method for an atom or molecule is transformed into an all-electron pseudopotential formalism. The equations of the la method are exactly transformed into pseudo-orbital equations and the resulting pseudopotentials are replaced by simple density-dependent potentials derived from Thomas-Fermi model. It is shown that the new formalism satisfies the virial theorem. As the first application it is shown that the model explains the shell-structure of atoms by the property that the pseudo-orbitals for the (MS), (»p), (rid) etc. electrons are, in a very good approxi-mation, the solutions of the same equation and have their maxima at the same point thereby creating the peaks in the radial density characterizing the shell structure. 
  Reference    Z. Naturforsch. 35a, 628—636 (1980); received April 20 1980 
  Published    1980 
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 Identifier    ZNA-1980-35a-0628 
 Volume    35 
102Author    K. Washino, W. SchnabelRequires cookie*
 Title    On the Influence of p-Nitroacetophenone on Radiation-Induced Molecular Size Changes of DNA  
 Abstract    DNA has been irradiated in aqueous solutions with 16 MeV electron pulses (duration: 50— 100 ns). In the presence of p-nitroacetophenone (PNAP) the light scatter-ing intensity (LSI) increased after the pulse in Ar-and 02-saturated solutions indicating intermolecular cross-linking. The LSI increase was greatest in Ar-sat. solutions containing t-butanol (1 mol/1). In the absence of PNAP and t-butanol DNA was degraded as indicated by a de-crease of LSI. The results contribute to the understanding of radiation-induced reactions, DNA undergoes in the presence of sensitizers of high electron affinity. 
  Reference    Z. Naturforsch. 35a, 637—639 (1980); received April 5 1980 
  Published    1980 
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 TEI-XML for    default:Reihe_A/35/ZNA-1980-35a-0637_n.pdf 
 Identifier    ZNA-1980-35a-0637_n 
 Volume    35 
103Author    L. Klasinc, I. Novak, G. Kluge, M. ScholzRequires cookie*
 Title    Das Photoelektronenspektrum von Pyridin-N-Oxid anhand von Hel/Hell- Intensitäten [1]  
 Abstract    Comparison of Hel and Hell photoelectron (PE) spectra of pyridine-N-oxide enables the completion of the assign-ment of its electronic structure. 
  Reference    Z. Naturforsch. 35a, 640—642 (1980); eingegangen am 5. April 1980 
  Published    1980 
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 TEI-XML for    default:Reihe_A/35/ZNA-1980-35a-0640_n.pdf 
 Identifier    ZNA-1980-35a-0640_n 
 Volume    35 
104Author    Lecithin Dipalmitoyl, Bilayers, M. Hentschel, R. Hosemann, W. HelfrichRequires cookie*
 Title    Direct X-Ray Study of the Molecular Tilt in  
 Abstract    Direction and angle of molecular tilt in an ordered multilayer system of dipalmitoyl lecithin and water were directly determined by X-ray diffraction as a function of temperature in the gel phase with ca. 20 wt. °/o of water. 
  Reference    Z. Naturforsch. 35a, 643—644 (1980); received May 9 1980 
  Published    1980 
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 TEI-XML for    default:Reihe_A/35/ZNA-1980-35a-0643_n.pdf 
 Identifier    ZNA-1980-35a-0643_n 
 Volume    35 
105Author    W. D. BasierRequires cookie*
 Title    Sodium Ions in Hydrated Zeolite Na-Y, Studied by Pulsed Nuclear Magnetic Resonance of 23 Na at 295 K  
 Abstract    The free induction decay of 23 Na of hydrated zeolite Na-Y has been measured at 295 K. Its intensity as a func-tion of the length of the exiting pulse proves that a whole spectrum of 4 sodium ions per cage is observed. By ion exchange it is found that only the sodium ions in the six-membered rings (site S2) contribute to the observable NMR-signal. 
  Reference    Z. Naturforsch. 35a, 645—646 (1980); received May 7 1980 
  Published    1980 
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 TEI-XML for    default:Reihe_A/35/ZNA-1980-35a-0645_n.pdf 
 Identifier    ZNA-1980-35a-0645_n 
 Volume    35 
106Author    D.It Kurlat, D. Zadunaisky De Bäsch, M. RosenRequires cookie*
 Title    Thermoelectric Power of the Liquid Tin-Lead Eutectic Alloy  
 Abstract    We have measured the Seebeck coefficient of the Sno.74-Pbo.26 liquid alloy, in the temperature range 190° C— 700° C. The results were compared with those predicted by the Faber-Ziman theorv. 
  Reference    Z. Naturforsch. 35a, 647—648 (1980); received April 19 1980 
  Published    1980 
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 TEI-XML for    default:Reihe_A/35/ZNA-1980-35a-0647_n.pdf 
 Identifier    ZNA-1980-35a-0647_n 
 Volume    35 
107Author    Károly RózsaRequires cookie*
 Title    Hollow Cathode Discharges for Gas Lasers  
 Abstract    A review of hollow cathode discharges for gas (metal vapour) lasers is given. Particular attention is paid to the arc free discharge region and to the possibility of increasing the intensity of the ionic spectrum of the discharges. 
  Reference    Z. Naturforsch. 35a, 649—664 (1980); received March 27 1980 
  Published    1980 
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 TEI-XML for    default:Reihe_A/35/ZNA-1980-35a-0649.pdf 
 Identifier    ZNA-1980-35a-0649 
 Volume    35 
108Author    W. SchattkeRequires cookie*
 Title    Current Carrying States in Quantum Statistics of an Open System  
 Abstract    The current as a thermodynamic variable of an open system is investigated in the context of the nonlinear response to a static field. Starting from a closed system it is shown that usual ensem-ble statistics can be applied to the open system. The case of two weakly coupled systems is con-sidered for illustration. 
  Reference    Z. Naturforsch. 35a, 665—671 (1980); received March 1 1980 
  Published    1980 
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 TEI-XML for    default:Reihe_A/35/ZNA-1980-35a-0665.pdf 
 Identifier    ZNA-1980-35a-0665 
 Volume    35 
109Author    W. Von Zdrojewski, J. G. Rabe, W. F. SchmidtRequires cookie*
 Title    Photoelectric Determination of V0-Values in Solid Rare Gases  
 Abstract    Electronic conduction state energies Fo were measured by photoelectric effect for solid xenon (F0 =— 0.57 ± 0.05 eV, 160 K), solid krypton (F0 = -0.40 ± 0.05 eV, 114 K), and solid argon (Fo =— 0.0 ± 0.05 eV, 82 K). A novel photo cell was employed which eliminated some of the problems encountered in photoelectric work with rare gas solids. 
  Reference    Z. Naturforsch. 35a, 672—674 (1980); received May 27 1980 
  Published    1980 
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 TEI-XML for    default:Reihe_A/35/ZNA-1980-35a-0672.pdf 
 Identifier    ZNA-1980-35a-0672 
 Volume    35 
110Author    J. PetzoldRequires cookie*
 Title    Extension of Dirac's Substraction Formalism to Particles of Finite Size  
 Abstract    Extension of Dirac's Subtraction Formalism to Particles of Finite Size Dirac's subtraction formalism is extended to radiating particles of finite size. Irrespective of the charge distribution the equation of motion contains run-away solutions. Hence the radiation reaction is not well described by Ft". 
  Reference    Z. Naturforsch. 35a, 675—678 (1980); received May 19 1980 
  Published    1980 
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 TEI-XML for    default:Reihe_A/35/ZNA-1980-35a-0675.pdf 
 Identifier    ZNA-1980-35a-0675 
 Volume    35 
111Author    Joachim SeidelRequires cookie*
 Title    Hydrogen Stark Broadening by Different Kinds of Model Microfields  
 Abstract    The "method of model microfields (MAIM)", which has been employed successfully especially for the calculation of hydrogen Stark profiles, is based on the assumption that reliable line shapes may be obtained from just the probability density of the plasma microfield and its autocorrelation function. To test the influence of higher order statistical features two different model microfields have been used to investigate Stark broadening of hydrogen Lyman lines by either electrons or ions. Corresponding profiles computed in this way lie close together over the full intensity range, but systematic relative deviations of about 20% show up at frequency separations from the un-perturbed line of approximately three times the plasma frequency (for electrons or ions, respec-tively), i.e., in the "transition region" where neither the impact nor the static approximation holds. Though the joint action of electrons and ions as well as Doppler broadening will tend to diminish these deviations, the present form of the MMM cannot be expected to yield an accuracy better than some 10% throughout the line profile. 
  Reference    Z. Naturforsch. 35a, 679—689 (1980); received April 3 1980 
  Published    1980 
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 TEI-XML for    default:Reihe_A/35/ZNA-1980-35a-0679.pdf 
 Identifier    ZNA-1980-35a-0679 
 Volume    35 
112Author    Koichi Yamada, R. Schieder, G. Winnewisser, A. W. MantzRequires cookie*
 Title    Diode Laser Spectrum of HCCCN near 5 fxm  
 Abstract    The j'3 vibration-rotation band of cyanoacetylene, HC3N, has been measured in the wavenum-ber range 2068 to 2095 cm -1 to an accuracy of better than ± 0.005 cm -1 using a diode laser spec-trometer. The width of the observed lines is essentially limited by Doppler-broadening. The band center of the C3 vibration is determined from the observed P-and R-branch transitions to be at 2079.30500 (58) cm-*. The rotational constant of the excited state is B'= 0.151212 (10) cm" 1 . Recently it has become possible to synthesize the long carbon chain molecules HC3N, HC5N and HC7N in the laboratory using both chemical and rf-dis-charge techniques and to measure their microwave spectra [1—5]. These measurements permitted the rapid detection of the cyanopolyynes in the inter-stellar medium using radiotelescopes. The molecule cyano-octatetrayne, HC9N, has also been identified in interstellar space on the basis of theoretical pre-dictions and two observed rotational transitions, although the molecule has not yet been produced in the laboratory [6]. Clearly these molecules must exhibit infrared spectra due to rovibrational tran-sitions and it is important for both theoretical and astrophysical reasons to know precisely where the bands lie and their rotational structure. In this context it is of importance to note that the first infrared spectra of several molecules (i.e. HCCH...) have been detected in the circumstellar/interstellar medium [7]. We have hence begun a program to measure the spectra of carbon chain molecules at high resolution employing tunable diode lasers. With increasing length of the carbon chain of the cyanopolyyne molecules HC3N, HC5N, ... the rotational constant for each species decreases, and thus the spacing of the rotational structure of the vibrational bands decreases as well. On the other hand the band centers of the C = C stretching fundamental are expected to suffer only small wavelength shifts and thus this series of molecules is well suited for testing the high reso-lution capabilities of any infrared spectrometer. 
  Reference    Z. Naturforsch. 35a, 690—693 (1980); received May 16 1980 
  Published    1980 
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 TEI-XML for    default:Reihe_A/35/ZNA-1980-35a-0690.pdf 
 Identifier    ZNA-1980-35a-0690 
 Volume    35 
113Author    Robert Aronsson, Ernest KarawackiRequires cookie*
 Title    Refractive Index and Molar Refractivity of Molten AgN03  
 Abstract    The refractive index of molten AgNOß has been measured for four wavelengths (6832 A, 5145 A, 4880 A and 4579 Ä) at temperatures up to about 80° C above the melting point. It is shown that the molar refractivity (R) of molten AgN03 calculated according to the Lorentz-Lorenz equation is temperature (t) and hence density (o) dependent. The estimated dR/dt and di?/do values for visible light are 1.06 • 10 _9 (m 3 /mole K) and —0.984 • 10 _9 (m 6 /kg mole), respectively. 
  Reference    Z. Naturforsch. 35a, 694—696 (1980); received April 10 1980 
  Published    1980 
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 TEI-XML for    default:Reihe_A/35/ZNA-1980-35a-0694.pdf 
 Identifier    ZNA-1980-35a-0694 
 Volume    35 
114Author    A. Kawski, H. SzmacińskiRequires cookie*
 Title    Energieübertragung zwischen gleich-und ungleichartigen Molekülen in Lösung Y. Untersuchungen der Emmissionsanisotropie und der Resonanzübertragung zwi- schen ungleichartigen Molekülen in viskosen Lösungen  
  Reference    Z. Naturforsch. 35a, 697 (1980); eingegangen am 20. Dezember 1979 
  Published    1980 
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 TEI-XML for    default:Reihe_A/35/ZNA-1980-35a-0697.pdf 
 Identifier    ZNA-1980-35a-0697 
 Volume    35 
115Author    C. Prasad, R. Shanker, R. A. SinghRequires cookie*
 Title    Magnetic and Electrical Transport Properties of Vanadium Telluride  
 Abstract    Measurements of the magnetic susceptibility of a powdered sample of VTe in the temperature range 90 — 700 K, and of the a.c. electrical conductivity (o), thermoelectric power (0) and dielectric constant (E') of pressed pellets of the compound in the temperature range 300 —1100 K are report-ed. The compound is found to be antiferromagnetic with Neel temperature 420 ± 5 K. The ef-fective paramagnetic moment and paramagnetic Curie temperature are found to be 1.6 (J. B and — 250 K, respectively. The dependence of o, 0 and e' on temperature shows no anomaly at the Neel temperature and is indicative of the metallic nature of the compound. 
  Reference    Z. Naturforsch. 35a, 701—703 (1980); received March 30 1980 
  Published    1980 
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 TEI-XML for    default:Reihe_A/35/ZNA-1980-35a-0701.pdf 
 Identifier    ZNA-1980-35a-0701 
 Volume    35 
116Author    Klaus-Dieter HoffmannRequires cookie*
 Title    Der Lumineszenzprozeß in kristallinem Dibenzofuran mit Fremd- molekülen kontrollierter und unkontrollierter Konzentration (I. Die prompte Fluoreszenz)  
 Abstract    The prompte fluorescence of pure and anthracene doped crystals of dibenzofuran is characterized by the participation of a trap-fluorescence as can be concluded from the spectra and the fluores-cence decay. The molar fraction of the traps has been estimated to be about 10 -3 . A model is presented to describe the observed temperatur dependence of the fluorescence in the range 4.2 <L 293 K. Dibenzofuran eignet sich aufgrund der energeti-schen Lage des ersten angeregten Singulett Si-und Triplett Ti-Zustandes vornehmlich zum Studium der Energieübertragung zu verschiedenen eingebau-ten ähnlichen Fremdmolekülen, deren schwingungs-lose Si-oder Ti-Niveaus energetisch tiefer als die des Dibenzofuran selbst liegen. Nachdem es möglich schien, Dibenzofurankristalle herzustellen [1], deren spektroskopische Eigenschaf-ten einen hohen Reinheitsgrad erwarten ließen [2], wurden ,,reine" Dibenzofurankristalle und solche mit einer bekannten Anthracendotierung hergestellt, um den Energieübertragungsprozeß im System vom Dibenzofuran zum Anthracen zu studieren. Anthracen wurde aus folgenden Gründen als Do-tierung gewählt: 1. Der Si-Zustand des iVnthracens liegt zwischen dem Si-und dem Ti-Zustand des Dibenzofuran [3,4], 2. Der Ti-Zustand des Anthracen liegt unterhalb des Ti-Zustandes des Dibenzofuran [3, 4], 3. Der Verteilungskoeffizient von Anthracen in Di-benzofuran ist größer als 1; das heißt, daß sich Anthracen sehr gut in das Dibenzofurangitter (Daten bei 0. Dideberg et al. [5]) einbauen läßt. 
  Reference    Z. Naturforsch. 35a, 704—711 (1980); eingegangen am 23. Mai 1980 
  Published    1980 
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 TEI-XML for    default:Reihe_A/35/ZNA-1980-35a-0704.pdf 
 Identifier    ZNA-1980-35a-0704 
 Volume    35 
117Author    Jürgen Wiese, DieterH. SutterRequires cookie*
 Title    The Rotational Zeeman Effect of Thiazole and Isothiazole  
 Abstract    The rotational Zeeman effect of low J rotational transitions (J f^ 3) has been investigated for Thiazole and Isothiazole. The measured susceptibilities are compared to those calculated within the model of localized (atomic) susceptibilities, and nonlocal contributions to the susceptibility component perpendicular to the ring are obtained. These nonlocal susceptibilities, if compared to those of a set of related compounds appear to correlate to the "aromatic character" as deter-mined by chemical reactivity. Five or six membered rings with x±nonloca] < — 30-10 -6 erg/G 2 mol show "aromatic reactions" while molecules with —20-10~ 6 erg/G 2 < /^nonlocal show "olefinic reactions". 
  Reference    Z. Naturforsch. 35a, 712—722 (1980); received April 17 1980 
  Published    1980 
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 TEI-XML for    default:Reihe_A/35/ZNA-1980-35a-0712.pdf 
 Identifier    ZNA-1980-35a-0712 
 Volume    35 
118Author    H. Bomsdorf, H. Dreizler, H. MäderRequires cookie*
 Title    Investigation of Transient Dispersion and Absorption Phenomena with a Bridge Type Superheterodyne Microwave Spectrometer Measurement of T% -Relaxation of S03 and OCS  
 Abstract    A bridge type superhet spectrometer for time resolved investigation of rotational relaxation is described. Allowing the application of both Stark-and pump-modulation techniques the arrange-ment may be used for single and double resonance experiments, showing a lot of advantages compared with a conventional Stark-or double resonance-spectrometer. These features are dis-cussed in detail. By means of a MW-pulse method the following two-level experiments have been carried out. The rotational relaxation time T2 was measured by detection of M-unresolved transient emission signals for J == 1 -2 of 16()12C 32 S, i6Qi2C34S an(i i60i3C32g in natural isotopic abundance and for eight transitions of SO2 up to J = 43. The signals of transient dispersion were detected and com-pared with those of transient absorption. Their theoretical description in terms of the two-level Bloch equations is discussed. 
  Reference    Z. Naturforsch. 35a, 723—730 (1980); received May 19 1980 
  Published    1980 
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 TEI-XML for    default:Reihe_A/35/ZNA-1980-35a-0723.pdf 
 Identifier    ZNA-1980-35a-0723 
 Volume    35 
119Author    BjorgN. Cyvin, Grethe Neerland, Jon Brunvoll, SvenJ. CyvinRequires cookie*
 Title    Condensed Aromatics. Part VI Force-Field Approximation for the Out-of-Plane Molecular Vibrations  
 Abstract    The out-of-plane vibrations of aromatic molecules are studied. Theoretical considerations are based on the "classical" Whiffen force field. The new approximation contains five numerical parameters and is considerably simpler than the one of WhifFen with seven parameters and sub-stantially more interaction terms. The five-parameter approximation is applied with success to benzene and naphthalene. 
  Reference    Z. Naturforsch. 35a, 731—738 (1980); received April 29 1980 
  Published    1980 
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 TEI-XML for    default:Reihe_A/35/ZNA-1980-35a-0731.pdf 
 Identifier    ZNA-1980-35a-0731 
 Volume    35 
120Author    D. Bonchev, 0. MekenyanRequires cookie*
 Title    A Topological Approach to the Calculation of the n-Electron Energy and Energy Gap of Infinite Conjugated Polymers a  
 Abstract    A procedure was developed, on the basis of the distance matrix of the graph, for the calculation of the specific jr-electron energy and energy gap in polymerhomologous series and infinite polymers. 25 conjugated polymers were examined by this procedure and a fairly good correlation between these energy characteristics and the sum of all distances in the graph (the Wiener index) was found. A zero energy gap was shown to occur in 12 polymers. For polymers composed of condensed benzenoid and non-benzenoid cycles, a linear correlation was found between the Wiener index normalized to infinite polymer chains and the specific 7r-electron energy thus revealing possibilities for predictions proceeding from monomer topology only. 
  Reference    Z. Naturforsch. 35a, 739—747 (1980); received January 9 1980 
  Published    1980 
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 TEI-XML for    default:Reihe_A/35/ZNA-1980-35a-0739.pdf 
 Identifier    ZNA-1980-35a-0739 
 Volume    35 
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