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  • 1995-1999  (17)
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Material
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Year
Keywords
  • 1
    Electronic Resource
    Electronic Resource
    On Electron Dynamics in Violent Cluster Excitations (1999)
    Springer
    Journal of cluster science 10 (1999), S. 239-270 
    Details
    ISSN: 1572-8862
    Keywords: Electron dynamics ; cluster excitations ; TDLDA
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract This article gives a brief review of recent progress in the theoretical description of electron and ion dynamics following strong excitations of a metal cluster. Intense femtosecond laser pulses and collisions with highly charged ions are considered typical examples for those violent excitation mechanisms. The theoretical tool is time-dependent local-density approximation (TDLDA) complemented by local pseudopotentials and occasionally explicit ionic motion (in terms of classical particles). We discuss the distribution of the initial excitation energy over collective plasmon oscillations, ionization, and internal thermalization. Relevant time scales for the dynamical evolution are evaluated and compared.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1021973512410
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Theories for multiple resonances (1995)
    Springer
    The European physical journal 351 (1995), S. 391-396 
    Details
    ISSN: 1434-601X
    Keywords: 21.60.Jz ; 21.60.Ev ; 03.65.Sq
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Two microscope theories for multiple resonances in nuclei are compared, n-particle-hole RPA and quantized Time-Dependent Hartree-Fock (TDHF). The Lipkin-Meshkov-Glick model is used as test case. We find that quantized TDHF is superior in many respects, except for very small systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01291144
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Nuclear shell gaps at finite temperatures (1999)
    Springer
    The European physical journal 6 (1999), S. 157-165 
    Details
    ISSN: 1434-601X
    Keywords: PACS: 21.60.Jz Hartree-Fock and random-phase approximations – 21.60.-n Nuclear-structure models and methods
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: Neutron–rich nuclei with a closed neutron shell represent chains of waiting–point nuclei in the astrophysical r–process. Details of their nuclear structure like separation energies, shell structure and β−–decay half–lives have a dramatic influence on element abundances calculated from r–process simulations. Actual supernova scenarios take place at finite temperature. To investigate the influence of finite temperature on binding energies and shell gaps, i.e. the second derivative of the binding energy, we calculate the shell gaps in the range of interest and slightly beyond, i.e. 0 ≤k B T≤ 0.8 MeV. Basis of the description is the self–consistent Skyrme–Hartree–Fock model and an extension of BCS pairing to finite temperature using a natural orbital representation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100500050330
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  • 4
    Electronic Resource
    Electronic Resource
    Electron transport in ballistic electron emission microscopy (1998)
    Springer
    Applied physics 66 (1998), S. S897 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 73.50.-h; 07.79.-v
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003390051263
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  • 5
    Electronic Resource
    Electronic Resource
    Superheavy nuclei in deformed mean--field calculations (1998)
    Springer
    The European physical journal 3 (1998), S. 139-147 
    Details
    ISSN: 1434-601X
    Keywords: PACS:21.30.Fe Forces in hadronic systems and effective interactions – 21.60.Jz Hartree-Fock and random-phase approximations – 24.10.Jv Relativistic models – 27.90.+b 220 ≤ A
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: The ground–state properties of superheavy nuclei are investigated within various parametrisations of relativistic and nonrelativistic nuclear mean–field models. The heaviest known even–even nuclei starting with Z = 98 are used as a benchmark to estimate the predictive power of the models and forces. From that starting point, deformed doubly magic nuclei are searched in the region 100 ≤ Z ≤ 130 and 142 ≤ N ≤ 190.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100500050160
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Large amplitude dynamics of clusters and nuclei (1998)
    Springer
    Czechoslovak journal of physics 48 (1998), S. 715-724 
    Details
    ISSN: 1572-9486
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We discuss and compare the dipole resonance modes in nuclei and metal clusters under varying conditions: different excitation mechanisms in the case of nuclei, changed background structure in the case of clusters. The resonances are generally nicely harmonic modes, even those with a large amplitude. Only extreme shapes, as they occur in fusion and fission, can perturb this harmonicity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1021406109605
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  • 7
    Electronic Resource
    Electronic Resource
    Field amplification in Na clusters (1998)
    Springer
    The European physical journal 3 (1998), S. 175-178 
    Details
    ISSN: 1434-6079
    Keywords: PACS. 36.40.Cg Electronic and magnetic properties of clusters - 36.40.Gk Plasma and collective effects in clusters - 36.40.Wa Charged clusters
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: We study the amplification of an incoming fs laser pulse through the resonant plasmon response in a metal cluster taking Na clusters as test case and using density-functional theory for the description of the electronic dynamics. We find large amplification factors for moderate laser intensities. The effect shrinks for higher intensities because the binding forces of the electron cloud set a limit for the effective fields. The response shows resonant behaviour much similar to an harmonic oscillator. It is found to be independent of cluster size.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100530050161
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Ionization and energy deposition in metal clusters irradiated by intense lasers (1998)
    Springer
    The European physical journal 4 (1998), S. 207-218 
    Details
    ISSN: 1434-6079
    Keywords: PACS. 36.40.Cg Electronic and magnetic properties of clusters - 36.40.Wa Charged clusters - 42.50.Hz Strong-field excitation of optical transitions in quantum systems; multi-photon processes; dynamic Stark shift
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: We study the excitation of metal clusters irradiated by intense laser beams, within the framework of a time dependent density functional approach at fully quantal or semiclassical levels. We focus on ionization processes and energy deposition. It is shown that intense lasers are as efficient as energetic ions to create highly charged clusters, and with comparable deposited excitation energy. We also discuss coupling of electronic to ionic degrees of freedom. We finally consider the importance of accounting for dynamical two-body correlations in the semiclassical approximation and discuss second harmonic generation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100530050201
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  • 9
    Electronic Resource
    Electronic Resource
    Plasmon response in K, Na and Li clusters: systematics using the separable random-phase-approximation with pseudo-Hamiltonians (1998)
    Springer
    The European physical journal 4 (1998), S. 343-352 
    Details
    ISSN: 1434-6079
    Keywords: PACS. 36.40.Cg Electronic and magnetic properties of clusters - 36.40.Gk Plasma and collective effects in clusters - 36.40.Vz Optical properties of clusters - 36.40.Wa Charged clusters
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: The systematics of the plasmon response in spherical K, Na and Li clusters in a wide size region is studied. Two simplifying approximations whose validity has been established previously are considered: (a) a separable approach to the random-phase-approximation, involving an expansion of the residual interaction into a sum of separable terms, (b) the electron-ion interaction is modeled within the pseudo-Hamiltonian jellium model (PHJM) including nonlocal effects by means of realistic atomic pseudoHamiltonians. In cases where nonlocal effects turn out to be negligible, the Structure Averaged Jellium Model (SAJM) has been used. The leading role of Landau damping in forming the plasmon width in medium and large clusters is demonstrated. Good agreement with available experimental data is achieved for K, Na (using the SAJM) and small Li clusters (invoking the PHJM). The trends for peak position and width are generally well reproduced, even up to details of the Landau fragmentation in several clusters. Less good agreement, however, is found for large Li clusters. The possible reasons of the discrepancy are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100530050218
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  • 10
    Electronic Resource
    Electronic Resource
    Structure and optic response of the Na9 + and Na55 + clusters (1999)
    Springer
    The European physical journal 9 (1999), S. 149-152 
    Details
    ISSN: 1434-6079
    Keywords: PACS: 36.40.-c Atomic and molecular clusters – 31.15.-p Calculations and mathematical techniques in atomic and molecular physics – 71.15.-m Methods of electronic structure calculations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. We present the ionic geometries of Na9 + and Na55 + clusters obtained in the “cylindrically averaged pseudopotential scheme”. Our structures are tested by calculating photoabsorption spectra and comparing them to the experimentally measured ones. We employ a local pseudopotential that has been constructed to reproduce atomic and bulk properties of sodium. Comparing the results using different pseudopotentials, we find that the position of the dipole resonance is greatly influenced by details of the pseudopotentials, showing that these must be used consistently both in the geometry optimization and the calculation of the optic response.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100530050416
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    Paper (German National Licenses)
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