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  • 1995-1999  (2)
  • 1990-1994  (3)
  • 1
    Digitale Medien
    Digitale Medien
    Energy transfer in collisions of alkali-metal clusters and ions (1995)
    Springer
    The European physical journal 33 (1995), S. 289-293 
    Details
    ISSN: 1434-6079
    Schlagwort(e): 36.40 ; 34.50
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The electronic energy loss of a positively charged projectile passing through a sodium cluster is calculated by the semiclassical Vlasov method. The electron density before impact is obtained within the localdensity approximation in the jellium model. For the dynamical response, the Vlasov equations are solved by test particle discretization. The model gives the correct breathing mode and dipole Mie frequencies. The energy deposit is calculated as a function of projectile velocity, charge and impact parameter and is compared with theoretical and tabulated values for bulk sodium.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01437509
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  • 2
    Digitale Medien
    Digitale Medien
    Static electric dipole polarizabilities of alkali clusters (1999)
    Springer
    The European physical journal 9 (1999), S. 243-248 
    Details
    ISSN: 1434-6079
    Schlagwort(e): PACS: 36.40.-c Atomic and molecular clusters – 32.10.Dk Electric and magnetic moments, polarizability – 31.15.Ew Density functional theory
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract. We have measured the static dipole polarizability of lithium and sodium clusters (n=1-22). Values measured for sodium are in agreement with previous experiments. While the polarizability per atom for sodium clusters decreases slowly as a function of the cluster size, a sharp decrease between sizes 1 and 4 is observed for lithium clusters. Experimental values are compared to Density Functional Theory (DFT/PW91) calculations. The size evolutions for sodium and lithium cluster polarizabilities are well reproduced by our calculations. The sharp decrease observed for small lithium clusters is discussed in terms of electronic density.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s100530050433
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  • 3
    Digitale Medien
    Digitale Medien
    Excitation of multiply charged ions by electron impact (1991)
    Springer
    The European physical journal 21 (1991), S. S203 
    Details
    ISSN: 1434-6079
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01426290
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  • 4
    Digitale Medien
    Digitale Medien
    Ionic structure effects on the optical response of lithium clusters (1993)
    Springer
    The European physical journal 28 (1993), S. 81-85 
    Details
    ISSN: 1434-6079
    Schlagwort(e): 71.10.+x ; 36.40.+d ; 31.10.+z
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01437458
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  • 5
    Digitale Medien
    Digitale Medien
    Many-electron correlations in alkali-metal clusters (1993)
    Springer
    The European physical journal 26 (1993), S. 125-127 
    Details
    ISSN: 1434-6079
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01425639
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