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  • 1
    Electronic Resource
    Electronic Resource
    Optical plasmon losses in stabilized Au55 clusters (1991)
    Springer
    The European physical journal 20 (1991), S. 297-300 
    Details
    ISSN: 1434-6079
    Keywords: 33.20.K ; 36.40 ; 42.20 ; 78.40 ; 82.70
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Au55 cluster compounds are investigated by optical spectroscopy and TEM. The optical spectra appear to be rather structureless, neither showing a collective excitation resonance nor exhibiting distinct absorption bands known from lower nuclearity clusters. We discuss changes of the electronic properties compared to larger Au clusters affecting both, 6sp electrons and5d-6sp interband transitions, the cluster-ligand-interaction being considered as a charge transfer process. We additionally report on a low temperature instability of the cluster compound, which results in changed optical extinction spectra. A characteristic absorption feature at λ=400 nm is attributed to small, ligand-free Au cluster fragments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01543995
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  • 2
    Electronic Resource
    Electronic Resource
    Photoemission on gold-55-clusters derived from gold-phosphine AuP(C6H5)3Cl (1991)
    Springer
    The European physical journal 20 (1991), S. 377-379 
    Details
    ISSN: 1434-6079
    Keywords: 79.60 ; 71.20 ; 36.40
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We measured XPS and UPS spectra of gold clusters with 55 atoms, embedded in an electrically isolating phosphine matrix, and of gold-phosphine, from which the clusters were chemically derived. Compared to the spectra of bulk gold the valence band spectrum and the core level spectra of the clusters showed shifts of the peaks and the fermi level to higher binding energies. The shift of the peaks could qualitatively be interpreted by a final state effect. We succeeded in a separation of bulk and surface contributions to the core level spectra and in a reasonable quantitative analysis of the valence band spectrum of the clusters. The Au 4f core level spectrum of gold-phosphine showed two peaks at 1.5 eV higher binding energies than the corresponding peaks of the clusters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01544015
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  • 3
    Electronic Resource
    Electronic Resource
    The optical extinction of ligand-stabilized Au13- and Au55-clusters: The vanishing of the Mie-resonance (1993)
    Springer
    The European physical journal 26 (1993), S. 1-3 
    Details
    ISSN: 1434-6079
    Keywords: 36.40 ; 33.20K
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We present optical extinction spectra of ligand-stabilized Au-clusters AuN with sizes of N=13 and N=55. They are compared to larger, embedded clusters up to N=5·103 (diameter 5nm). The Mie resonance due to excitation of the dipole plasmon polariton vanishes with decreasing cluster size. For N〉55, this effect has recently been interpreted as caused by smearing out of the interband transition edge of Au.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01425599
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