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  • 1
    Electronic Resource
    Electronic Resource
    Absorption spectroscopy and photodissociation dynamics of small helium cluster ions (1995)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 102 (1995), S. 8773-8779 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The optical absorption of size-selected helium cluster ions was studied via photofragmentation spectroscopy. Absorption cross sections were measured for He+n (n=3, 4, 10, 21, and 30). A broad absorption peak was found, which for He+3 is centered at ≈5.3 eV, and which with increasing cluster size shifts slightly to the red. In addition, the kinetic energy release to the ionized and neutral photofragments was measured by a time-of-flight technique for cluster sizes between n=3 and 10. From the energy balance the total binding energy of the He+3 trimer ion was determined to be 2.6±0.15 eV. The results further indicate that a charged linear trimer acts as a core molecule for the sizes n=4–7. For n(approximately-greater-than)7, an additional isomer with a tetramer core is identified. The results are compared with recent ab initio calculations. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.468980
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  • 2
    Electronic Resource
    Electronic Resource
    Laser-induced density changes in supersonic Ar beams (1989)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 60 (1989), S. 344-346 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The nonresonant heating of a supersonic beam nozzle induced by antiparallel coaxial irradiation by a cw Ar+ laser has been investigated time dependent using a mass spectrometer and an Ar beam. The resulting laser-induced decrease of beam density as a function of laser power and source pressure is quantitatively modeled, leading to an accurate measure of effective nozzle temperature and beam heating.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1140435
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    The photoionization of large pure and doped helium droplets (1996)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 104 (1996), S. 2548-2556 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The photoionization of neutral liquid helium droplets (mean particle number 〈N〉=102–107) was studied using synchrotron radiation at photon energies ranging from 15 to 30 eV. Mass spectra as well as total and mass selective ion yields were measured as a function of the photon energy for different droplet sizes. The experiments indicate that ionization occurs not only by a direct process at photon energies above the atomic ionization potential but also at energies below the threshold by an autoionization process. The latter ionization mechanism proceeds via the electronically excited states of the neutral droplet, which show a strong neutral droplet size dependence. For large neutral droplets HeN(〈N〉(approximately-greater-than)104) retarding field measurements established that a predominant part of the total ion yield results from larger cluster ions He+k(k(approximately-greater-than)103). These measurements also show that a decay by fluorescence emission is much more probable than one by ionization following the photoexcitation process. In droplets with embedded SF6 molecules these are ionized indirectly by Penning ionization via excitons which leads to a large ion signal on the mass of the embedded species. No evidence for direct photoionization of the impurities was found. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.471009
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  • 4
    Electronic Resource
    Electronic Resource
    Cold Ar 3 + generated by ionization of argon clusters in large helium clusters: Temperature dependence of the photofragmentation (1995)
    Springer
    The European physical journal 98 (1995), S. 417-419 
    Details
    ISSN: 1434-6036
    Keywords: 36.40.Mr ; 36.40.Qv ; 67.55.Lf
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Ionized argon clusters were generated by electron impact ionization of neutral argon clusters embedded in large neutral helium clusters. Photofragmentation spectroscopy of Ar 3 + and Ar 3 + He produced in this way demonstrates the strong influence of vibrational excitation on the photodissociation dynamics, and indicates the low internal energy of the latter cluster.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01338417
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    Paper (German National Licenses)
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