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  • 36.40.+d  (7)
  • Springer  (7)
  • American Chemical Society
  • American Physical Society (APS)
  • Molecular Diversity Preservation International
  • Public Library of Science
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Schlagwörter
Verlag/Herausgeber
  • Springer  (7)
  • American Chemical Society
  • American Physical Society (APS)
  • Molecular Diversity Preservation International
  • Public Library of Science
Erscheinungszeitraum
  • 1
    Digitale Medien
    Digitale Medien
    Secondary ion mass spectra of gold super clusters up to 140000 dalton (1990)
    Springer
    The European physical journal 17 (1990), S. 73-76 
    Details
    ISSN: 1434-6079
    Schlagwort(e): 36.40.+d ; 35.20.Wg ; 07.75.+h
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The bombardment of a two-shell gold complex (Au55(PPh3)12Cl6) with 10 keV Xe+-ions results in the formation of secondary ion masses up to 140000 u. These are by far the largest secondary ions observed under primary particle bombardment. The detection and identification of these ions with a Time-Of-Flight Secondary Ion Mass Spectrometer (TOF-SIMS) gives important information about the behavior of naked full-shell clusters. Au13 particles, generated from the Au55 cluster, serve as building blocks for a series of super-clusters up to (Au13)55. The results for keV-ion bombardment are compared to those for MeV-ion bombardment.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01437501
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  • 2
    Digitale Medien
    Digitale Medien
    EPR on the high-nuclearity palladium cluster Pd561Phen36O200 (1989)
    Springer
    The European physical journal 12 (1989), S. 457-459 
    Details
    ISSN: 1434-6079
    Schlagwort(e): 75.60.Jp ; 36.40.+d ; 76.30.-V
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract We present EPR measurements on the polynuclear metal-cluster compound Pd561Phen36O200 for temperatures ranging from 300 K to 8 K. No temperature dependence was found in either the resonance field or the line-width. The signal intensity shows a Curie-like behavior. The effect of the ligand on this behavior is discussed. We also discuss the possibility that quantum size effects govern the observed temperature dependence of the line-width and resonance field.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01426996
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  • 3
    Digitale Medien
    Digitale Medien
    The quadrupolar and hyperfine splittings in the metal cluster compound Au55(PPh3)12Cl6 (1993)
    Springer
    The European physical journal 26 (1993), S. 27-29 
    Details
    ISSN: 1434-6079
    Schlagwort(e): 36.40.+d ; 65.40.−f ; 76.80.+y
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract There are 5 different Au-sites in the Au55 core of Au55(PPh3)12Cl6. The 13 inner atoms are almost identical to that of bulk gold. At the surface the attachment of the ligands is responsible for further differentiation. We have calculated the low temperature specific heat using the Mössbauer determined electrical quadrupolar splitting of the surface atoms. Due to too long a quadrupolar relaxation time, no such contribution is seen in the zero field results (down to 0.06 K) of Goll et al., Z. Phys. D 20, 329 (1991). The latter zero and in-field data are interpreted as the contribution of an electronic spin, hyperfine coupled to a nuclear spin 3/2. The effective abundance is about one spin per ten clusters.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01425607
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  • 4
    Digitale Medien
    Digitale Medien
    An EXAFS study of some gold and palladium cluster compounds (1993)
    Springer
    The European physical journal 26 (1993), S. 8-11 
    Details
    ISSN: 1434-6079
    Schlagwort(e): 61.10.Lx ; 61.60.+m ; 36.40.+d
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Gold L3-edge EXAFS measurements at 80 K on Au55(PPh3)12Cl6 confirm that the Au-Au distances in this amorphous metal cluster compound are significantly shorter than in bulk gold. The nearest-neighbour Au-Au distances are all equal within experimental uncertainty. Outer-shell Au-Au distances have also been resolved. The results are consistent with the cuboctahedral structure originally proposed for this cluster, but not the polyicosahedral one recently suggested. Very similar results have been obtained from the sulphonated water-soluble derivative Au55(PPh2C6H4SO3Na)12Cl6. In contrast, EXAFS of Au11{PPh2(p-ClC6H4)}7I3 has clearly resolved the two nearest-neighbour Au-Au distances associated with its icosahedral structure. Palladium K-edge EXAFS has been used to study the cluster Pd561(phen)36O200. The Pd-Pd distance is nearly equal to that in bulk palladium. The results show a cubic close-packed cluster structure for this material, in contrast to the icosahedral structure reported for Pd561(phen)60(OAc)180.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01425601
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  • 5
    Digitale Medien
    Digitale Medien
    The electronic contribution to the low temperature specific heat in the metal cluster compounds Au55(PPh3)12Cl6, Pt309Phen 36 * O30 and Pd561Phen37O200 - a comparison (1993)
    Springer
    The European physical journal 26 (1993), S. 30-32 
    Details
    ISSN: 1434-6079
    Schlagwort(e): 36.40.+d ; 65.40.Em
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The low temperature specific heat of the metal cluster molecular compounds Au55(PPh3)12Cl6, Pt309 Phen 36 * O30 and Pd561Phen37O200, with resp. 55, 309 and 561 core atoms are compared. ForT ∼ 1 K, Pt309 and Pd561 show a linear contribution toC/R of about 1/3 of the bulk value. A Poisson distribution of the electronic energy levels is suggested as an explanation.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01425608
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  • 6
    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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  • 7
    Digitale Medien
    Digitale Medien
    Low-temperature specific heat of the cluster compound Au55 (P(C6H5)3)12Cl6 (1991)
    Springer
    The European physical journal 20 (1991), S. 329-331 
    Details
    ISSN: 1434-6079
    Schlagwort(e): 36.40.+d ; 65.40.−f
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Specific-heat measurements on the cluster compound Au55(P(C6H5)3)12Cl6 at temperatures 0.06 K ≤T≤3 K and in magnetic fields 0≤B≤6 T are reported. While above 0.6 K the specific heatC is dominated by the inter-cluster vibrational contribution observed previously, an anomalous increase ofC towards lowT is observed below 0.3 K, withC ∼T −2. This contribution develops into a Schottky-like anomaly forB≥0.4 T, indicating that it might be attributed to local moments which are also observed in ESR measurements. From the height of the anomaly one can infer that approximately one tenth of the Au55 clusters carry a magnetic moment. For 0.6 K≤T≤1 K andB=0 our data indicate the absence of a linear electronic specific-heat contribution expected for bulk Au. This possibly constitutes the first direct observation of the quantum-size effect on electronic energy levels in the specific heat.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01544003
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