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  • 36.40.+d  (6)
  • 33.20.K  (3)
  • Springer  (9)
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  • Springer  (9)
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  • 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
    The relationship of Au55(PPh3)12Cl6 to colloidal gold (1989)
    Springer
    The European physical journal 12 (1989), S. 533-536 
    Details
    ISSN: 1434-6079
    Schlagwort(e): 33.20.K ; 35.20.G ; 36.40
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01427012
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  • 3
    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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  • 4
    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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  • 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
    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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  • 7
    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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  • 8
    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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  • 9
    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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