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1972 (325)
1Author    H. BolterauerRequires cookie*
 Title    A Modified quasiparticle Model  
 Abstract    By use of the quasiparticle-quasihole space as model space, a model is established in order to determine excitation energies and transition probabilities of atomic nuclei. The equations derived show a remarkable correspondence to those in Migdal's quasiparticle theory. The validity of the quasiparticle hypothesis, which is fundamental in Migdal's theory, is not a necessary condition for a weak dependency of the effective interaction. This energy dependency is also independent of the choice of the one particle basis. 
  Reference    (Z. Naturforsch. 27a, 1—7 [1972]; received 25 September 1971) 
  Published    1972 
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 TEI-XML for    default:Reihe_A/27/ZNA-1972-27a-0001.pdf 
 Identifier    ZNA-1972-27a-0001 
 Volume    27 
2Author    A. RieckersRequires cookie*
 Title    Representation of Symmetries and Observables in Functional Hilbert Space. II.  
 Abstract    The representation of infinitesimal generators corresponding to the group representation dis-cussed in the preceding paper is analyzed in the Hilbert space of functionals over real test func-tions. Explicit expressions for these unbounded operators are constructed by means of the functio-nal derivative and by canonical operator pairs on dense domains. The behaviour under certain basis transformations is investigated, also for non-Hermitian generators. For the Hermitian ones a com-mon, dense domain is set up where they are essentially selfadjoint. After having established a one-to-one correspondence between the real test function space and a complex Hilbert space the theory of quantum observables is applied to the functional version of a relativistic quantum field theory. 
  Reference    (Z. Naturforsch. 27a, 7—22 [1972]; received 20 August 1971) 
  Published    1972 
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 TEI-XML for    default:Reihe_A/27/ZNA-1972-27a-0007.pdf 
 Identifier    ZNA-1972-27a-0007 
 Volume    27 
3Author    G. Küppers, H. TassoRequires cookie*
 Title    Stability to Localized Modes for a Class of Axisymmetric Magnetohydrodynamic Equilibria  
 Abstract    Mercier's criterion is computed numerically for an exact class of axisymmetric MHD equilibria having possibly elliptical cross sections and a flat current profile. The main result is that the toroidal current density and the plasma beta can be increased by one order of magnitude if a) the eccentricity of the magnetic surfaces, b) the poloidal current, and c) the aspect ratio are adequa-tely chosen, and if the ellipses are vertical. 
  Reference    (Z. Naturforsch. 27a, 23—26 [1972]; received 14 October 1971) 
  Published    1972 
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 TEI-XML for    default:Reihe_A/27/ZNA-1972-27a-0023.pdf 
 Identifier    ZNA-1972-27a-0023 
 Volume    27 
4Author    P. DeimelRequires cookie*
 Title    Driftgeschwindigkeit und Beweglichkeit von Elektronen in Silicium bei 4,2 °K in Abhängigkeit vom elektrischen Feld  
 Abstract    Driftvelocity and Mobility oj Electrons in Silicon at 4.2 °K in Dependence of Electric Field The pulse rise times of an n-type silicon surface barrier detector were measured at 4.2 °K. At this temperature the detector was fully depleted even at very low bias and the measured pulse rise times gave direct information about the driftvelocity and the mobility. Instead of E~an dependence of the mobility at moderate electric fields was found. At high electric fields agreement exists with theory. 
  Reference    (Z. Naturforsch. 27a, 26—30 [1972]; eingegangen am 26. Mai 1971) 
  Published    1972 
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 TEI-XML for    default:Reihe_A/27/ZNA-1972-27a-0026.pdf 
 Identifier    ZNA-1972-27a-0026 
 Volume    27 
5Author    W. BehmenburgRequires cookie*
 Title    A New Optical Method for the Determination of Interatomic Potentials  
 Abstract    A new method is described to obtain information on the true difference potential of interatomic interaction from the quasistatic wings of spectral lines broadened by neutral atoms. Based on the one-particle-approximation of the quasistatic theory of line broadening, it does not rely on any particular model function. Furthermore, from measurements of the temperature dependence of the line wings it may yield additional information on the potentials for the initial or final state of the line separately. The method is appplied to measurements of the red wing of the mercury absorp-tion line ö'Sq —6 3 Pi X 2537 Ä, perturbed by argon. 
  Reference    (Z. Naturforsch. 27a, 31—36 [1972]; received 28 August 1971) 
  Published    1972 
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 TEI-XML for    default:Reihe_A/27/ZNA-1972-27a-0031.pdf 
 Identifier    ZNA-1972-27a-0031 
 Volume    27 
6Author    W.Schmidt W Appt, N. Wittekindt, Carl Zeiss, Oberkochen, ForschungsgruppeRequires cookie*
 Title    Characteristics of a Cresyl Violet Laser  
 Abstract    The properties of flashlamp-and laser-pumped cresyl violet lasers emitting between 620 and 710 nm were studied. In mixed cresyl violet-rhodamine 6G solutions, the excitation efficiency was found to be enhanced by more than a factor of two, the major part of the excitation energy being supplied by the rhodamine 6G fluorescence radiation. Self-modelocking in a 3-component solution, containing cresyl violet, rhodamine 6G and a saturable absorber dye, was observed. 
  Reference    (Z. Naturforsch. 27a, 37—41 [1972]; received 5 November 1971) 
  Published    1972 
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 TEI-XML for    default:Reihe_A/27/ZNA-1972-27a-0037.pdf 
 Identifier    ZNA-1972-27a-0037 
 Volume    27 
7Author    J. U. Von Schütz, H. C. WolfRequires cookie*
 Title    Bewegungen der CH3-Gruppen in Methyl-Naphthalin-Kristallen I. Protonen-Spin-Relaxation in kristallinen Methyl-Derivaten des Naphthalins  
 Abstract    The longitudinal proton relaxation time 7\ in methyl naphthalene crystals, differing in the arrangement and number of the substituted CH3 groups, was measured as a function of the tem-perature above 77 °K and the magnetic field between 0.9 and 20 kOe. The results can be described by hindered rotation of the methyl groups with the jumping times and activation energies strongly dependent on the group arrangement. In the /?-position the rotational barrier of 0.8 kcal/mol is predominantly determined by the infermolecular interaction, whereas in the case of the a-position and for adjacent CH3's the hindering potential of 2.4 kcal/mol arises largely from the intramolecu-lar term. 
  Reference    (Z. Naturforsch. 27a, 42—50 [1972]; eingegangen am 17. September 1971) 
  Published    1972 
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 TEI-XML for    default:Reihe_A/27/ZNA-1972-27a-0042.pdf 
 Identifier    ZNA-1972-27a-0042 
 Volume    27 
8Author    H. Kolb, H. C. WolfRequires cookie*
 Title    Protonen-Rel axati on durch Triplett-Excitonen in Naphthalin-und Anthracen-Kristallen  
 Abstract    The spin lattice relaxation time 7\ of protons in naphthalene and anthracene crystals is de-creased by the presence of metastable triplet excitons in these crystals. The exciton induced relaxation time T\T Exc is measured at 300 °K and 77 °K and at Larmor frequencies between 0.4 and 44 MHz. From the frequency dependence of T\T Exc the exciton-proton correlation time rc at the two temperatures is determined to 5.5 • 10 -12 sec and 4.1-10 -12 sec (±10%) in anthracene and 2.1-10"" 11 sec and 1-10 -11 sec in naphthalene, assuming scalar proton-electron interaction and statistical incoherent hopping motion of the excitons. The predictions of a theoretical model for exciton-migration are in satisfying agreement with the experimental results as far as experimental data for the parameters of that model are available. 
  Reference    (Z. Naturforsch. 27a, 51—55 [1972]; eingegangen am 22. Oktober 1971) 
  Published    1972 
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 TEI-XML for    default:Reihe_A/27/ZNA-1972-27a-0051.pdf 
 Identifier    ZNA-1972-27a-0051 
 Volume    27 
9Author    K. Altmann, G. Strey, J. G. Hochenbleicher, J. BrandmüllerRequires cookie*
 Title    Si mul ati on des Intensitätsverlaufs im Raman-Spektrum von Sauerstoff unter Berücksi chti gung der Spi naufspal tung  
 Abstract    A high-resolution Raman spectrum of the oxygen molecule has been analysed taking into account the spin-splitting of its rotational levels, the contribution of 16 0 18 0-isotope and N2-impurity. The intensity contour has been simulated by a computer program. 
  Reference    (Z. Naturforsch. 27a, 56—64 [1972]; eingegangen am 4. Oktober 1971) 
  Published    1972 
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 TEI-XML for    default:Reihe_A/27/ZNA-1972-27a-0056.pdf 
 Identifier    ZNA-1972-27a-0056 
 Volume    27 
10Author    K. Altmann, G. StreyRequires cookie*
 Title      
 Abstract    A computer program for simulation of the rotational structure of Raman bands is described. The program is used for an analysis of the Raman spectra of gaseous chlorine. 
  Reference    (Z. Naturforsch. 27a, 65—67 [1972]; eingegangen am 22. Oktober 1971) 
  Published    1972 
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 TEI-XML for    default:Reihe_A/27/ZNA-1972-27a-0065.pdf 
 Identifier    ZNA-1972-27a-0065 
 Volume    27 
11Author    ÄraH. TopouzkhanianRequires cookie*
 Title    Vibration-Rotation Interaction in the HF Mol ecul e II. Evaluation of the r-Centroids and the Higher Terms of the Electric Dipole Moment for Some Vibration-Rotation Bands  
 Abstract    The wave functions, calculated by the method described in a preceding article, are used for the evaluation of the r-centroids relative to the 1 — 0 transition of the X state. By means of experi-mental line intensities, it is shown that in the expansion of the electric dipole moment, the qua-dratic and higher terms are not negligible. 
  Reference    (Z. Naturforsch. 27a, 68—71 [1972]; received 22 September 1971) 
  Published    1972 
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 TEI-XML for    default:Reihe_A/27/ZNA-1972-27a-0068.pdf 
 Identifier    ZNA-1972-27a-0068 
 Volume    27 
12Author    J. Blaser, 0. Lutz, W. SteinkilbergRequires cookie*
 Title    Nucl ear Magneti c Resonance Studi es of 35 Cl, 37 C1, 79 Br, and 81 Br in Aqueous Sol uti on  
 Abstract    The NMR signals of the nuclei 2 H, 35 C1, 37 C1, 79 Br and 81 Br have been investigated in aqueous solutions. The concentration dependence of the NMR si gnal s of 35 C1 and 81 Br has been determined in solutions of alkali hal i des and alkali Perchl orates in H20 and D20 and the l arge solvent isotope effect on the chemi cal shift has been established. The ratios of the Larmor frequencies of the halide nuclei relative to 2 H have been measured with high accuracy. Using the concentration dependence, the ratios of the Larmor frequencies of the hal i de nuclei for infinite dilution relative to 2 H in pure D20 are given. From these ratios, magneti c moments for the halide nuclei have been derived. 
  Reference    (Z. Naturforsch. 27a, 72—76 [1972]; received 1 October 1971) 
  Published    1972 
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 TEI-XML for    default:Reihe_A/27/ZNA-1972-27a-0072.pdf 
 Identifier    ZNA-1972-27a-0072 
 Volume    27 
13Author    R. Ley, W. SchauerRequires cookie*
 Title    Mol ekül strahl -Resonanz-Messungen von Hyperfeinstruktur, Zeeman-und Stark-Effekt an TlCl-Isotopen in verschi edenen Schwi ngungszuständen  
 Abstract    Molecular 
  Reference    (Z. Naturforsch. 27a, 77—91 [1972]; eingegangen am 27. September 1971) 
  Published    1972 
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 TEI-XML for    default:Reihe_A/27/ZNA-1972-27a-0077.pdf 
 Identifier    ZNA-1972-27a-0077 
 Volume    27 
14Author    J. Heitbaum, R. SchönwasserRequires cookie*
 Title    Gl ei chzei ti ge Messung von Hyperfeinstruktur, Stark-Effekt und Zeeman-Effekt des 87 RbF mit ei ner Mol ekül strahl -Resonanzapparatur  
 Abstract    Simultaneous The electric and magnetic properties of the molecule 87 RbF in the rotational state / = 1 and the vibrational states i; = 0, 1 were studied by a molecular beam resonance apparatus. The rotational state (/, mj) was separated by an electric quadrupole lense as A-field and focused to the detector by a similar lense as B-field. The vibrational states could be resolved by their different Stark-effect-energies. In the transition region homogeneous electric and magnetic fields were superimposed. The observed {AMJ= + transitions were induced electrically. The measured spectra permitted the calculation of the following molecular constants: the elec-tric dipole moment //el > the rotational magnetic dipole moment /uj/J, the scalar and tensor nuclear dipole-dipole-interaction ds and c?t » the nuclear spin-rotational interactions CRb and cf , the nuclear quadrupole interaction e g Qrb> the nuclear magnetic moment /<(1 — Os)Rb> the anisotropy of the diamagnetic susceptibility — f||)» the anisotropy of the diamagnetic shielding of the external field by the electrons at the position of the nuclei (a — a |]) -The results were (/=!, v = 0) : /uei = 8,5453 (60) deb , fxjj] — —0,04170(15) kHz/G, dB/h = 0,86(40) kHz, dj/h = 2,45(37) kHz, CRb/Ä = 1.68(26) kHz, cF/h = 10,37(14) kHz, 
  Reference    (Z. Naturforsch. 27a, 92—99 [1972]; eingegangen am 27. September 1971) 
  Published    1972 
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 TEI-XML for    default:Reihe_A/27/ZNA-1972-27a-0092.pdf 
 Identifier    ZNA-1972-27a-0092 
 Volume    27 
15Author    H. Dijkerman, W. Flegel, G. Gräff, B. MönterRequires cookie*
 Title    Bei träge zum Stark-Effekt der Mol ekül e *«T1 19 F und 39 K 19 F  
 Abstract    Contributions to the Stark-Effect of the Molecules 2«5T1 19 F and 3»K 19 F The dominant contribution to the Stark-effect energy of polar diatomic molecules can be calculated from the model of the rigid rotator. Additional terms arise from the anharmonicity of vibration, the centrifugal distortion, the vibration-rotation interaction and the electronic pola-rizability. These contributions to the Stark-effect have been investigated for the molecules 205 T1F and 39 KF with a molecular beam electric resonance apparatus suitable to detect rotational transitions. Measure-ments have been performed at values of electrical field corresponding a) to a minimum in the frequency for the transition (/, mj) = (1, 0) -> (2,0) for vibrational states v=0, 1, 2 and b) cor-responding to the electrical field where the transitions (/, mj) = (1, 0) (0, 0) and (1, 0) —> • (2, 0) for r=0 occur at the same frequency. Interpretation of our data requires more precise values of the Dunham coefficients than have been published to date. These coefficients therefore have been recalculated from rotational tran-sitions measured at zero electrical field. 
  Reference    (Z. Naturforsch. 27a, 100—110 [1972]; eingegangen am 27. September 1971) 
  Published    1972 
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 TEI-XML for    default:Reihe_A/27/ZNA-1972-27a-0100.pdf 
 Identifier    ZNA-1972-27a-0100 
 Volume    27 
16Author    H. H. Seydewitz, E. D. SchmidRequires cookie*
 Title    Die Pol ari sati on der a-Bi ndungen im Azul en Ein Vergleich der Ergebnisse von IR-Intensitätsmessungen der CH-Valenzschwingungen und CNDO/2-Rechnung  
 Abstract    On the basis of a simple MO-approach a model to interprete the IR-absorption intensity of the aromatic CH-stretching vibration is developed. Accordingly the gradient of the CH-bond moment is a linear function of the ionicity of the CH-bond. Eight azulenes, which were deuterated at various specified positions, were synthetisized and out of their IR-spectra the gradients of the CH-bond moment at all positions of azulene could be de-termined. From these experimental data it is concluded, that in relation to benzene the electrons of the CH-bonds in azulene are displaced towards the C-atom at positions with high and towards the H-atom at positions with low ^-electron density. Such a polarisation of the CH-bonds in azulene is confirmed, although only qualitatively, by the ionicities of the CH-bonds calculated by the CNDO/2-method and is also in accordance with other experimental observations such as bond lengths and angles, C 13 H-coupling constants, and the fre-quencies of the CH-stretching vibrations. It is demonstrated that experiment and calculation fail to correlate quantitatively due to in-adequacies inherent in the CNDO/2-method. 
  Reference    (Z. Naturforsch. 27a, 110—128 [1972]; eingegangen am 27. September 1971) 
  Published    1972 
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 TEI-XML for    default:Reihe_A/27/ZNA-1972-27a-0110.pdf 
 Identifier    ZNA-1972-27a-0110 
 Volume    27 
17Author    A. Müller, N. Mohan, U. HeidbornRequires cookie*
 Title    On the Ratio L 12 /L 21 For n = 2 Eigenvalue Problems: An Empirical Constraint For The Calculation of Force Constants (Extended L Matrix Approximation)  
 Abstract    The variation of the ratio L12/L21 (where Lij refers to the element of the L matrix) as a func-tion of the mass coupling term T=G12/\ 0 has been studied for molecules of the type XY4(Td), XY3(D3h) and XY2(C2v) using the exact force field data. In the case of the XY4 and XYS type molecules, the ratio L12/L21 is nearly independent of the mass coupling and in the case of the XY2 type, it shows a nearly linear dependence on T. The force constants have been evaluated using an empirically determined constraint for L12/L2l. The values are generally in good agreement with the exact ones. In all cases except VC14 the exact interaction term of the F matrix is in agreement with the sign rule of Müller et al. 
  Reference    (Z. Naturforsch. 27a, 129—132 [1972]; received 22 October 1971) 
  Published    1972 
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 TEI-XML for    default:Reihe_A/27/ZNA-1972-27a-0129.pdf 
 Identifier    ZNA-1972-27a-0129 
 Volume    27 
18Author    W. UlmerRequires cookie*
 Title    Ab-initio-Berechnung kleiner zweiatomiger Moleküle mit minimaler Basis  
 Abstract    By means of Frost's FSGO-method the systems Ne, Ne —Ne, Be —Be, and the molecules B, as a single and triple bond, CO as a double and triple bond, N2 as a triple bond, and LiH have been calculated. The resulting energies are between 10% and 15% above the HF-limit, but the energy differences of the distinct bond representations are evidently sufficient to give an information about bond relations of a molecule. The type of bond is characterized, defining a "bond-strength", by the position of the Gaussian orbitals. 
  Reference    (Z. Naturforsch. 27a, 133—137 [1972]; eingegangen am 25. October 1971) 
  Published    1972 
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 TEI-XML for    default:Reihe_A/27/ZNA-1972-27a-0133.pdf 
 Identifier    ZNA-1972-27a-0133 
 Volume    27 
19Author    GeorgeA. Sullivan, Sune Larsson, PerT. ThernquistRequires cookie*
 Title    Thermotransport of Noble Metal Impurities in Lead  
 Abstract    Steady-state distributions of Au, Ag and Cu tracers in Pb wafers subjected to temperature gra-dients have been determined. The effective heats of transport were +5.8 + 1.1 for Ag, —0.5 + 0.3 for Au, and of the order of +35 for Cu (all in kcal/mole, positive values denoting the impurity migrating to the cold side of the Pb wafer). No significant temperature dependence of the heats of transport could be detected. The results are difficult to reconcile with existing theories of the intrinsic and electronic contribution to the heat of transport. 
  Reference    (Z. Naturforsch. 27a, 138—140 [1972]; received 26 September 1971) 
  Published    1972 
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 TEI-XML for    default:Reihe_A/27/ZNA-1972-27a-0138.pdf 
 Identifier    ZNA-1972-27a-0138 
 Volume    27 
20Author    J. Richter, S. SehmRequires cookie*
 Title    Thermodynamic Properties of Alkali Nitrate—Silver Nitrate Melts  
 Abstract    EMF measurements were performed on a chemical cell containing a silver and a nitrate elec-trode. The systems NaN03 + AgN03 , LiN03+AgN03, and pure AgN03 were investigated in a temperature range of 240 °C to 310 °C and in the total concentration range permitted by the phase diagram. We found a linear dependence of the EMF on temperature. Six constants, characteristic for the investigated molten salts depending neither on composition nor on temperature, were de-termined by the analytical construction of the activity coefficients. Together with the analytically constructed excess molar Gibbs function, the excess molar entropy was calculated from calorimetric data in the literature. 
  Reference    (Z. Naturforsch. 27a, 141—148 [1972]; received 5 October 1971) 
  Published    1972 
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 TEI-XML for    default:Reihe_A/27/ZNA-1972-27a-0141.pdf 
 Identifier    ZNA-1972-27a-0141 
 Volume    27 
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