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  • 1985-1989  (205)
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  • 1
    facet.materialart.
    Unbekannt
    Application of catastrophe theory in earthquake hazard assessment and earthquake prediction research (1989)
    In:  Tectonophys., L'wiw, Inst. f. Theoret. Geodäsie, vol. 167, no. 11, pp. 179-186, pp. B01408, (ISSN: 1340-4202)
    Details
    Publikationsdatum: 1989
    Schlagwort(e): Earthquake precursor: prediction research ; Earthquake hazard ; Chaotic behaviour ; Earthquake precursor: statistical anal. of seismicity
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 2
    facet.materialart.
    Unbekannt
    Crystallization and crystal packing analysis of DNA oligonucleotides (1988)
    Elsevier
    Details
    Publikationsdatum: 1988-07-01
    Print ISSN: 0022-0248
    Digitale ISSN: 1873-5002
    Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik
    Publiziert von Elsevier
    Standort Signatur Erwartet Verfügbarkeit
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    AKTUELLE ARTIKEL
  • 3
    Digitale Medien
    Digitale Medien
    Diffusion of hydrogen in Pb β‘ alumina (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 58 (1985), S. 4587-4593 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Hydrogen diffuses into Pb β‘ alumina during ion exchange of Na β‘ alumina in molten lead halide salts. The hydrogen resides in the lattice as OH− groups with the protons bound at several kinds of sites. The intrinsic diffusion coefficients of hydrogen and deuterium determined from analysis of infrared absorption profiles following isotope exchange are 9.1, 5.3, and 1.1.×10−7 cm2/s at 515, 455, and 350 °C, respectively. These data fit an Arrhenius equation with an activation energy of 0.54 eV and a preexponential factor of 2.67×10−3 cm2/s. Protons are transported through the conduction layers by hopping to adjacent O= ions. The principal contribution to the activation energy is the energy required to break the O–H bond.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.336251
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    Artikel (Nationallizenzen)
    Volltext
  • 4
    Digitale Medien
    Digitale Medien
    Chemiluminescent reactions of ground and metastable states of the group IV A elements with halogens (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 91 (1989), S. 2834-2839 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: Earlier work on chemiluminescent beam-gas reactions of the ground states (3 PJ ) of Si, Ge, and Sn with F2 and of both ground and metastable states (1 D, 1 S) of Sn with Cl2 , Br2, and I2 is extended to include reactions of both ground and metastable states of Si, Ge, and Sn with F2 , Cl2 , Br2 , I2 , and ICl. Chemiluminescent products of metal halides and/or dihalides were observed in all of these reactions, although attempts to observe that in the similar reactions of Pb were unsuccessful. In ICl reactions with Si, Ge, and Sn, both monochloride and dichloride emission occurs, confirming the previously proposed mechanism for creating dihalide emission in Sn reactions with Br2 and I2 via a monohalide intermediate.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.456952
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    Artikel (Nationallizenzen)
    Volltext
  • 5
    Digitale Medien
    Digitale Medien
    Potential energy surfaces for Tc+H2 and Ru+H2 reactions (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 91 (1989), S. 7761-7771 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: Potential energy surfaces of 12 electronic states of TcH2 and RuH2 are obtained using a complete active space MCSCF (CASSCF) followed by multireference singles + doubles configuration interaction calculations (MRSDCI). The 6S ground state of Tc has to surmount a barrier of 40 kcal/mol to insert into H2 while the 5F ground state of Ru inserts into H2 with a much smaller barrier of 8.5 kcal/mol. The excited 6D, 4D, and doublet states of Tc atom insert into H2 spontaneously. The ground state of TcH2 is a linear 6Σ+g state arising from the 6S state of the Tc atom, while the ground state of RuH2 is of bent equilibrium geometry with 3A2 symmetry. A nearly degenerate bent state of 3B1 symmetry also exists for RuH2 . The bent minima of TcH2 are at least 0.9 eV above the linear 6Σ+g ground state of TcH2 . The ground state of RuH2 is 35 kcal/mol more stable than Ru(3F) + H2 while the 6Σ+g ground state of TcH2 is 27 kcal/mol more stable than Tc(6S)+H2 . All the bent states of TcH2 and RuH2 are ionic exhibiting strong M+H− polar bonds. The M–H bonds are made of dsp hybrid bonds as evidenced from Mulliken population analyses.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.457243
    Standort Signatur Erwartet Verfügbarkeit
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    Artikel (Nationallizenzen)
    Volltext
  • 6
    Digitale Medien
    Digitale Medien
    Calculated vibrational intensities for photoionization of a mixed Rydberg–valence 3Σ state of O2 (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 89 (1988), S. 4654-4656 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: Vibrational intensities for the photoionization of oxygen molecules from the v'=0 level of the mixed Rydberg–valence E 3Σ−u state to the v+=0–4 levels of the X 2Πg state of the ion have been calculated using the solutions of coupled Schrödinger equations to represent the nuclear motion. The results are compared with the photoelectron spectrum for this transition obtained recently by Miller et al.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.455685
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    Artikel (Nationallizenzen)
    Volltext
  • 7
    Digitale Medien
    Digitale Medien
    Alignment effects in Ca–He(5 1P1–5 3PJ) energy transfer collisions by far wing laser scattering (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 89 (1988), S. 4771-4776 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: The far wing absorption profiles for excitation on the Ca(4s2 1S0–4s5p 1P01) atomic transition, broadened in collisions with He are measured. We observe strong absorption in both wings and a blue wing satellite near Δ∼125 cm−1. We tentatively identify this satellite as due to a maximum in the CaHe(4s2 1∑+–4s5p 1∑+) difference potential. These line-broadening techniques are used to study electronic energy transfer in the spin-changing collisions of Ca with He: Ca(5p 1P01) +He→Ca(5p 3P0J)+He+ΔE. Measurements of the "single collision'' triplet–singlet branching ratio as a function of laser detuning from the atomic resonance frequency indicate a clear red wing/blue wing asymmetry. We interpret this asymmetry in terms of a preferential orbital alignment effect in the energy transfer process [Phys. Rev. Lett. 53, 2296 (1984)]. No clear structure is observed in the range of detunings probed that might indicate the curve crossing responsible for the energy transfer.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.455671
    Standort Signatur Erwartet Verfügbarkeit
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    Artikel (Nationallizenzen)
    Volltext
  • 8
    Digitale Medien
    Digitale Medien
    Variable-depth calorimetry of a layered material (1988)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 59 (1988), S. 2031-2035 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: We have investigated the use of frequency variation in ac calorimetry in the measurement of thermal quantities within controllable distances of the sample heater and thermometer. This technique, useful in studies of heterogeneous samples where only a small part of the sample is of interest, e.g., surfaces, thin films, and interfaces, is applied to study the thermal properties of a test sample made from indium (In) sandwiched between layers of bulk gallium arsenide. We measure and analyze the frequency dependence of the thermal response of the sample, as well as the variation with frequency of the relative size of the anomaly observed at the In superconducting transition. The data are consistent with a model assuming a thermal diffusion-limited sampling volume.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1140020
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    Artikel (Nationallizenzen)
    Volltext
  • 9
    Digitale Medien
    Digitale Medien
    Fractional quantum Hall effect in a high-mobility GaAs/AlxGa1−xAs multiple quantum well heterostructure (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 54 (1989), S. 27-29 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: We report the realization of a high mobility [μ(approximately-equal-to)4.8×105 cm2/(V s)] selectively doped GaAs/AlxGa1−xAs multiple quantum well structure with low density (ns (approximately-equal-to)1.7×1011 cm−2 for each of the 85 wells) grown by molecular beam epitaxy. The activation energy for the fractional quantum Hall state at the Landau-level filling factor ν=1/3 is Δ(approximately-equal-to)2 K, the highest value ever reported for any multiple quantum well structure. Such a structure is nearly ideal for studies of the thermal properties of the two-dimensional electron system in the fractional quantum Hall regime.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.100820
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    Artikel (Nationallizenzen)
    Volltext
  • 10
    Digitale Medien
    Digitale Medien
    Unipolar charging of ultrafine particles by diffusion of ions: theory and experiment (1985)
    s.l. : American Chemical Society
    Langmuir 1 (1985), S. 150-158 
    Details
    ISSN: 1520-5827
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/la00061a027
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    Artikel (Nationallizenzen)
    Volltext
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