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  • 33.20.K  (3)
  • 74.70.Vy  (2)
  • 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
    The relationship of Au55(PPh3)12Cl6 to colloidal gold (1989)
    Springer
    The European physical journal 12 (1989), S. 533-536 
    Details
    ISSN: 1434-6079
    Keywords: 33.20.K ; 35.20.G ; 36.40
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The electronic (UV-visible) spectrum of the molecular cluster Au55(PPh3)12Cl6 shows features corresponding to the 520 nm plasma resonance and the shorter-wavelength interband transition of colloidal gold. These absorptions differ qualitatively from the simpler one-electron transitions of lower-nuclearity cluster molecules. Differential scanning calorimetry has been used to measure the enthalpy of decomposition of Au55(PPh3)12Cl6. The Au-Au bonding appears to be substantially stronger than in bulk gold.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01427012
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  • 3
    Electronic Resource
    Electronic Resource
    The electronic quantum size effect observed by195Pt NMR in the metal cluster compound Pt309Phen 36 * O30 (1993)
    Springer
    The European physical journal 26 (1993), S. 21-23 
    Details
    ISSN: 1434-6079
    Keywords: 74.30.Gn ; 74.70.Vy ; 76.60.Es
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract 195Pt NMR on the organic ligand stabilized metal cluster compound Pt309Phen 36 * O30 reveals two separate peaks in the lineshape. Ligand-bonded platinum atoms at the surface of the core are thought to be responsible for the peak that does not show any Knight shift. The corresponding spin-lattice relaxation timeT 1 is of the order of seconds. The second peak is Knight shifted and is attributed to the other Pt atoms, for which metallic behavior is inferred from the temperature dependence ofT 1. The Korringa relation holds down to 65 K. Below 65 K the relaxation of the magnetization becomes increasingly non-exponential with decreasing temperature. The relaxation process can be successfully modelled under the assumption of a Poisson distribution of the energy levels around the Fermi energy (the electronic quantum size effect).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01425605
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  • 4
    Electronic Resource
    Electronic Resource
    Solid state magic angle spinning13C and31P NMR of organic ligand stabilized high nuclearity metal clusters (1993)
    Springer
    The European physical journal 26 (1993), S. 24-26 
    Details
    ISSN: 1434-6079
    Keywords: 74.30.Gn ; 74.70.Vy ; 76.60.Es
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract 13C and31P solid state NMR measurements on the organic ligands in ligated Au55, Ni8, Pt309, Cu36 and Cu70 clusters are reported. The ligands behave like diamagnetic organic molecules, giving rise to relatively narrow lines with excellent cross-polarization efficiency. The resonance lines of the nuclei directly bound to the metal core are systematically broadened in the conducting compounds. No pronounced Knight shifts or evidence of metallic-like relaxation were observed. These results support a model for the electrical conduction involving tunneling between metal cores with the ligands playing the role of a tunneling barrier.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01425606
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  • 5
    Electronic Resource
    Electronic Resource
    Optical properties of systems containing Au55-clusters (1989)
    Springer
    The European physical journal 12 (1989), S. 515-520 
    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 Gold cluster compounds were investigated which contain clusters of 55 gold atoms in each unit. The ligands stabilize these clusters and, hence, many-cluster systems can be prepared which mainly show the properties of the single dressed cluster. Experimental results of optical and electron-microscopical investigations are presented and shortly discussed in view of the question whether the clusters are molecular or solid-state like.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01427009
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