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  • Articles: DFG German National Licenses  (3)
  • 1990-1994  (3)
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  • Articles: DFG German National Licenses  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 21 (1991), S. S203 
    ISSN: 1434-6079
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A new crossed beam apparatus has been developed for measuring differential cross sections for the excitation of multiply charged ions by electron impact. First results have been obtained for sodium-like Argon (Ar7+); the 3s-3p transition with an excitation energy of ∼ 17.5 eV has been studied at an electron energy of 100 eV. The preliminary experimental values are compared with theoretical results obtained within a Born-approximation.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 28 (1993), S. 81-85 
    ISSN: 1434-6079
    Keywords: 71.10.+x ; 36.40.+d ; 31.10.+z
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The optical response of alkali metal clusters is shown to be sensitive to a proper treatment of the electronion interaction and to the ionic spatial structure. A spherical symmetry model based on a combination of a geometrical optimization of the ionic structure and the random phase approximation (RPA) with exact exchange is applied to calculate the optical response of Li 139 + . The optical response obtained within this model is in good agreement with the measured giant dipole resonance.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 26 (1993), S. 125-127 
    ISSN: 1434-6079
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Ground state and excited states properties of alkali-metal clusters are investigated within the framework of the jellium model from the standpoint of the Hartree-Fock theory. The present study deals with closed-shell systems with up to 138 delocalized electrons. Dipoles excited states are described within the random-phase approximation (RPA) with full exchange contributions. The total jellium energy is calculated to second order of many-body perturbation theory with exchange contributions being taken into account fully. The correction to the self-energy that is due to the screening of the Coulomb interaction is evaluated by summing polarization diagrams to all orders. The model is used to calculate the ionization potentials of one-valence-electron systems (9, 21, 41). Results are discussed and compared with others which are based on the local-density-approximation.
    Type of Medium: Electronic Resource
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