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  • 1
    Digitale Medien
    Digitale Medien
    Shell effects in large AlN clusters (1993)
    Springer
    The European physical journal 26 (1993), S. 92-94 
    Details
    ISSN: 1434-6079
    Schlagwort(e): 36.40.+d ; 03.65.Sq ; 33.80.Eh ; 35.20.Vf
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Neutral aluminum clusters have been produced by laser vaporization technique, ionized by a low-power near-threshold laser light and detected using standard TOF spectrometric methods. Ionization potentials have been deduced in the low size range. In the large size range 250〈N〈1400 the patterns of the mass spectra exhibit a regular and continuous oscillation, originating from size-dependent ionization threshold effects. The period, constant on a Ne 1/3 scale (Ne=3N is the number of valence electrons), is approximately two times shorter than the one observed in alkali experiments. This feature is analyzed in terms of shell structure.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01425628
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Production and stability of silicon-doped heterofullerenes (1999)
    Springer
    The European physical journal 9 (1999), S. 49-54 
    Details
    ISSN: 1434-6079
    Schlagwort(e): PACS: 36.40.-Qv Stability and fragmentation of clusters
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract. Silicon–carbon binary clusters with various mean compositions are generated in a laser vaporization source from targets processed as mixtures of graphite and silicon powders. Their size distribution is first analyzed by time-of-flight mass spectroscopy, which shows the stability of carbon fullerenes doped with silicon atoms in substitutional sites. Further investigations on the level of silicon doping are carried out by means of the laser-induced fragmentation of selected sizes. The photoproduct size distributions give evidence for at least nine silicon atoms substituted into still stable fullerene networks. The synthesis of heterofullerenes is mainly assisted by the nucleation mechanisms from Si-C mixed atomic vapors. Just as in the case of externally doped fullerene precursors, the laser-induced annealing of stoichiometric silicon-carbide clusters appears as an alternative route to produce heterofullerenes in the gas phase.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s100530050398
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Shell effects in photoionization spectra of heavy trivalent metal clusters (1993)
    Springer
    The European physical journal 26 (1993), S. 137-139 
    Details
    ISSN: 1434-6079
    Schlagwort(e): 36.40.+d ; 35.20.Vf ; 33.80.Eh
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Laser photoionization experiments have been performed on a large size range of indium and thallium clusters. The metal clusters were produced by laser vaporization technique and analyzed after laser ionization by standard time-of-flight mass spectrometry. For the indium clusters, individual ionization potentials (IP) are deduced for N≤132. Abrupt decreases in the IP values are observed, which correspond to the openings of new electronic shell as predicted by the spherical jellium model. For larger indium clusters, the unresolved mass spectra present small but reproducible oscillations. Interpretations in terms of either electronic shell structure or cluster geometry remain undecided for the moment. Our results on thallium clusters are less abundant and only qualitative. Nevertheless, they show that thallium behaves more like a monovalent element than like a trivalent one.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01425643
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