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  • 1990-1994  (3)
  • 13.10. + q  (1)
  • 36.40  (1)
  • 82.65  (1)
  • Computational Chemistry and Molecular Modeling  (1)
  • Atomic, Molecular and Optical Physics
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Erscheinungszeitraum
Jahr
Schlagwörter
  • 1
    Digitale Medien
    Digitale Medien
    Limits for two-photon ande + e − decay widths of positron-electron scattering resonances for√s=1.78 to 1.92 MeV (1991)
    Springer
    The European physical journal 340 (1991), S. 209-218 
    Details
    ISSN: 1434-601X
    Schlagwort(e): 14.80.Pb ; 13.10. + q ; 12.20.Fv
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Motivated by the observation of energy- and momentum-correlatede + e − pairs in heavy ion collisions, a search for resonances ine + e − scattering at the corresponding energies has been made. Thee + e − decay channel is analyzed in a time window from ∼ 10−13 s to ∼ 10−11 s with a set-up optimized for low-background detection of delayede + e − decays. The two-photon decay channel of a hypothetical resonance is investigated by measuring the two-photon annihilation-in-flight excitation function. New upper limits for the partiale + e − decay width Γee of a few meV are derived for total centre-of-mass energies √s between 1.78 and 1.92 MeV, taking into account the dilepton as well as the two-photon decay of a neutral resonance.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01303834
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  • 2
    Digitale Medien
    Digitale Medien
    Quantum chemical investigations of the latent image formation (1990)
    Springer
    The European physical journal 15 (1990), S. 79-86 
    Details
    ISSN: 1434-6079
    Schlagwort(e): 31.20 ; 36.40 ; 82.65
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The alternating process of adsorption of Ag+ and trapping of a photoelectron on a (100) AgBr surface is investigated by quantum chemical calculations. The results give some insight into the initial steps of the photographic process (absorption of two photons which lead to the formation of a sublatent image).
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01436914
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  • 3
    Digitale Medien
    Digitale Medien
    Pseudopotential calculations for methyl compounds of zinc and magnesium (1990)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Computational Chemistry 11 (1990), S. 1029-1037 
    Details
    ISSN: 0192-8651
    Schlagwort(e): Computational Chemistry and Molecular Modeling ; Biochemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Informatik
    Notizen: Pseudopotentials and valence basis sets to be used in calculations for organometallic compounds of zinc and magnesium have been tested in calculations for the M(CH3)n (M = Zn, Mg; n = 1,2) molecules. Valence correlation effects are treated at the SDCI and CEPA levels. The capability of a polarization potential on zinc to account for the valence shell contracting effect of core valence correlation is studied. Properties considered are geometries, force constants, Mulliken populations, ionization potentials, atomization, and binding energies. Differences in bonding between the two dimethyl compounds are discussed.
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/jcc.540110905
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