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  • 76.60.Es  (3)
  • 42.20  (2)
  • ATOMIC AND MOLECULAR PHYSICS
  • Biochemistry and Biotechnology
  • Chemistry
  • General Chemistry
  • Springer  (5)
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  • 1
    Digitale Medien
    Digitale Medien
    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
    Schlagwort(e): 74.30.Gn ; 74.70.Vy ; 76.60.Es
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: 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).
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01425605
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  • 2
    Digitale Medien
    Digitale Medien
    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
    Schlagwort(e): 74.30.Gn ; 74.70.Vy ; 76.60.Es
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01425606
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  • 3
    Digitale Medien
    Digitale Medien
    Optical properties of systems containing Au55-clusters (1989)
    Springer
    The European physical journal 12 (1989), S. 515-520 
    Details
    ISSN: 1434-6079
    Schlagwort(e): 33.20.K ; 36.40 ; 42.20 ; 78.40 ; 82.70
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01427009
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  • 4
    Digitale Medien
    Digitale Medien
    Optical plasmon losses in stabilized Au55 clusters (1991)
    Springer
    The European physical journal 20 (1991), S. 297-300 
    Details
    ISSN: 1434-6079
    Schlagwort(e): 33.20.K ; 36.40 ; 42.20 ; 78.40 ; 82.70
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01543995
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  • 5
    Digitale Medien
    Digitale Medien
    NMR in metal cluster compounds compared to glasses (1991)
    Springer
    The European physical journal 20 (1991), S. 333-335 
    Details
    ISSN: 1434-6079
    Schlagwort(e): 36.40.+d ; 76.60.Es
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The field and temperature dependence of the31P nuclear spin lattice relaxation rate in the metal cluster compound Ru55(P(t-Bu)3)12Cl20 follows a power law: 1/T 1 ∝T n B −m , withn=1.5±0.1 at 3.25 T andn=1.3±0.1 at 6.45 T;m ⋍ 1.4. Such dependences have so far only been observed in inorganic glasses and been attributed to two level systems. The correspondence suggests that the relaxation rate is due to interaction of theP-nuclear moment with electronic spins of stochastically moving charge carriers, which are thought to be responsible for the electrical conductivity through hopping between neigboring cluster molecules.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01544004
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