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  • 1990-1994  (4)
  • 1993  (4)
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  • 1990-1994  (4)
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  • 1
    Electronic Resource
    Electronic Resource
    Delayed ionization of IR-laser excited C60 (1993)
    Springer
    The European physical journal 26 (1993), S. 311-313 
    Details
    ISSN: 1434-6079
    Keywords: 36.40.+d ; 35.20.Wg
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Using a pulsed CO2 laser we have desorbed C60 clusters from a solid target into an expanding He jet, coupled to a time-of-flight mass spectrometer. We observed self ionization of the excited clusters with a time delay of 120 ±20 µs. This is large compared to previously reported delays of up to 15 µs after laser excitation with visible or ultraviolet light. We suggest that the delayed ionization is caused by structural isomers of hot C60 clusters differing from the truncated-icosahedron structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01425700
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Static and dynamic forces on a permanent magnet levitating between superconducting surfaces (1993)
    Springer
    Journal of low temperature physics 93 (1993), S. 85-100 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A charged magnetic microsphere (radius 100 µm) is levitating inside a superconducting niobium capacitor. Because of its charge of about 1 pC, oscillations about the equilibrium position can be excited and detected electrically. The properties of this oscillator are investigated in order to study the static and dynamic forces of magnetic levitation. We find resonance frequencies between 200 Hz and 600 Hz. The resonance frequency and the damping are amplitude dependent due to nonlinear return forces and nonlinear friction, respectively. At small amplitudes the Q value is about 106 in vacuum. A dc field can be applied to change the equilibrium position and consequently the resonance frequency. From the data the spatial dependence of the static force and of the dynamic stiffness can be determined and an empirical relation between both is established. Quite often, we find a hysteretic behavior of the static force whereas the stiffness is a reversible function of the position. Amplitude dependent damping is observed both in the decay of the free oscillations and in the dependence of the amplitude of the forced oscillations on the driving force.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00682282
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Contact electrification of C60 (1993)
    Springer
    The European physical journal 26 (1993), S. 314-316 
    Details
    ISSN: 1434-6079
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have used gold-, tungsten-, and copper plates to contact repeatedly a C60 powder sample. We observed the flow of electrons to the sample leading to negative charge accumulation. In repeated-contact experiments, we find charge saturation after 15 contacts for gold and copper contact partners. This is typical for the behavior of a semiconductor. For contact with tungsten however, charge accumulation continues even after 30 contacts. This unusual behavior is explained by the electron state density distribution of C60.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01425701
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Alkali-hydride water cluster ions (1993)
    Springer
    The European physical journal 26 (1993), S. 204-206 
    Details
    ISSN: 1434-6079
    Keywords: 36.40.+d ; 81.10.Bk ; 35.20.Wg
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Using a CO2 laser we have desorbed LiOH and NaOH from a solid target into an expanding inert gas jet pulse. Subsequently the beam was ionized by photons from a UV laser. Surprisingly, we observed in mass spectra metal water clusters and metal-hydride water clusters. For the metals M=Li, Na we find that the [M(H2O)n]+ peaks are dominant for small clusters, while for large clusters (n〉20) the [MH(H2O)n]+ peaks are dominant. This indicates that the clathrate (H2O)20 may play an important role in the formation of metallo-water clusters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01429145
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    Paper (German National Licenses)
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