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  • 1990-1994  (5)
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  • 1
    Electronic Resource
    Electronic Resource
    Evolution of the electronic structure of lithium clusters between four and eight atoms (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 96 (1992), S. 1793-1809 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Absorption spectra of lithium clusters containing four to eight atoms have been measured using depletion spectroscopy. Few intense transitions are observed, always located in two predominant spectral regions, ∼480 and 680 nm. The spectra are interpreted using ab initio configuration interaction (CI) calculations, leading to a complete characterization of the excited states and a straightforward determination of the ground state geometrical structure. Intense transitions are explained by interference effects in the transition amplitude and symmetry considerations. Comparisons with semiclassical models, in which an effective mass correction is introduced, are also presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.462846
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Jahn–Teller analysis of the Na3 A state (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 93 (1990), S. 2332-2336 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The observation of some new bands assigned to the Na3 X–A system has allowed a rather complete theoretical treatment of the A electronic state. It exhibits large quadratic Jahn–Teller interaction giving rise for the lower levels to a localization in a hindered pseudorotation well. The band positions and intensities are in agreement with the values Es=1847 cm−1 and Eloc=196 cm−1, respectively for the stabilization and pseudorotation barrier energies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.459012
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    High resolution spectroscopy of small metal clusters (1991)
    Springer
    The European physical journal 19 (1991), S. 7-12 
    Details
    ISSN: 1434-6079
    Keywords: 36.40 +d ; 31.50 +w ; 35.20i
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The optical absorption spectrum of small lithium clusters has been measured up to Li8. In Li3 high resolution Two Photon Ionization (TPI) spectra have been recorded allowing us to determine the geometry and potential surfaces of the ground and excited states. In larger clusters, the excited states are dissociative and the absorption spectra have been obtained by Depletion Spectroscopy. Vibronic resolution is still achieved in Li4, but not in larger clusters. The measured spectra exhibit a rather small number of transitions to electronically excited states. In Li7, only one intense band is observed in the blue region, while in Li8, an intense band is also observed in the blue region and a much weaker band in the red region. All the obtained results are in very good agreement with the ab initio calculation of Bonacic-Koutecky et al. This demonstrates that molecular effects are always present in these small clusters. The semi-classical models of surface plasma resonances are also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01448245
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Optical absorption of LinH clusters (1993)
    Springer
    The European physical journal 26 (1993), S. 290-292 
    Details
    ISSN: 1434-6079
    Keywords: 36.40.d ; 33.80.Rv
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Photoabsorption spectra of free LinH clusters have been recorded for n=2 to 9. Clusters are produced by coexpansion of 10–100 mbars of lithium vapor and 2–4 bars of a 98 % / 2 % mixture of argon with hydrogen. Two photon ionization was used to study the X ← B system of Li2H while beam depletion spectroscopy was used to measure the absorption cross sections of larger clusters. Most observations may be interpreted by the localization of one electron on the hydrogen bonding in agreement with ionization potential measurements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01429172
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  • 5
    Electronic Resource
    Electronic Resource
    Ionization potential measurements of hydrogenated lithium clusters (1993)
    Springer
    The European physical journal 26 (1993), S. 128-130 
    Details
    ISSN: 1434-6079
    Keywords: 36.40.+d ; 35.20.VF
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Ionization Potentials of LinHm clusters have been measured by photoionization. As in Lin, odd-even alternations and shell closing effects are observed. In a first approximation, we find that LinH clusters behave like Lin−1 and LinH2 like Lin−2. The results may be interpreted by assuming that the bonding of one hydrogen localizes one electron and that the other electrons remain delocalized.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01425640
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    Paper (German National Licenses)
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