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  • Pure and doped C60  (2)
  • 33.20  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Inelastic neutron scattering results on pure and doped fullerenes (1994)
    Springer
    Journal of superconductivity 7 (1994), S. 643-645 
    Details
    ISSN: 1572-9605
    Keywords: Pure and doped C60 ; inelastic neutron scattering ; superconductivity ; phonon density of states
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Via inelastic neutron scattering (INS) generalized phonon densities of states are obtained for C60 and superconducting A3C60 (A=K, Rb). Changes in the intramolecular modes agree with and augment recent Raman (RA), infrared (IR), and INS measurements, i.e., in the vicinity of the high-frequency modes of C60 [H g (8),A g (2),H g (7)] we find a pronounced shift of about 10 meV toward smaller energy transfers upon intercalating with potassium. Separated from these vibrations by a gap are the intermolecular spectra which for the doped samples display well-defined optic modes at 11 and 14 meV due to the vibrations of Rb and K ions. Indications of a weak anomalous temperature dependence of low-energy phonons (ħω 〈3 meV) nearT c are observed for K3C60.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00728477
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  • 2
    Electronic Resource
    Electronic Resource
    Intermolecular vibrations in pure and doped C60: An inelastic neutron scattering study (1994)
    Springer
    Journal of superconductivity 7 (1994), S. 647-649 
    Details
    ISSN: 1572-9605
    Keywords: Pure and doped C60 ; inelastic neutron scattering ; phonon density of states
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract We discuss results of neutron time-of-flight spectroscopy on powder samples of C60, K3C60, and Rb3C60. Model calculations show that the excitation spectra can be well understood within the framework of lattice dynamics of a molecular crystal. Indications for a weak anomalous temperature dependence of low-energy phonons are observed for K3C60.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00728478
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Guest-host interaction and photochemical transformation of silver particles isolated in rare gas matrices (1986)
    Springer
    The European physical journal 3 (1986), S. 263-270 
    Details
    ISSN: 1434-6079
    Keywords: 33.20 ; 35.40 ; 53.20P ; 78.30
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Silver dimers and small clusters isolated in rare gas matrices are studied by UV-VIS absorption, emission, and resonance Raman spectroscopy. One, two, and three dimer trapping sites can be identified in Xe, Kr, and Ar matrices, respectively. The sites are identified by computer simulation to be either ofD 4h symmetry, with the molecules aligned in the 〈100〉-direction of thefcc-host lattice, or ofD 2h symmetry, with the molecules occupying single or double vacancies and aligned in the 〈110〉-direction. Low energy external modes of the dimers are observed in the resonance Raman spectra. They probe the guest-host interaction of the molecules and are assigned to librational modes. Trimers and larger clusters are found to be very photosensitive. Three different trimers can be observed in Xe and Kr matrices, respectively. They can be transformed reversibly into each other by laser irradiation. This indicates that probably three corresponding isomers can get stabilized in the two matrices. Further evidence for this interpretation is obtained from emission spectroscopy. Despite the photosensitivity of the trimers it is possible to stabilize the concentration of a particular species by a dual beam technique. Thus we obtained a resonance Raman spectrum of one species in a Xe matrix and a preresonance spectrum of the corresponding species in a Kr matrix.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01384815
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    Paper (German National Licenses)
    Fulltext
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