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  • 1990-1994  (2)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 96 (1992), S. 4303-4312 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The formation of negative ions by electron attachment in collisions of He atoms in the well-defined low-Rydberg state (n=14)1P with SF6 is studied as a function of the relative velocity of the reactants in a crossed-beam experiment at thermal energies. The data show that the cross section does not follow the behavior predicted by the free electron model; it presents a maximum and then decreases at low kinetic energy, thus providing a direct observation of the postattachment Coulomb interaction of the He+ and SF−6 product ions. It is assumed that, at low kinetic energy, rovibrational energy of SF−6 and SF6 which coexist inside a temporary collision complex (He+SF6)−, is transferred into translational energy of the collision products, allowing SF−6 and He+ to escape from the collision complex with reduced vibrational energy in SF−6 and increased kinetic energy of He+. Both can thus be detected even when the ion pair He+–SF−6 is expected to stay bound. This explains qualitatively the nonzero value of the cross section in this low kinetic energy range. At high kinetic energy, transfer of translational energy into rovibrational energy is assumed to occur inside the collision complex, leading to SF−6 ions with increased vibrational energy and thus shorter lifetime against autodetachment. This explains qualitatively the steeper than 1/vr decrease of the cross section in this high kinetic energy range.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1434-6079
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Low and high resolution X-ray spectra of the Kα satellites emitted fromMultiChargedIons (MCIs) in collisions with surfaces at variable vertical velocity allow for the first time to differentiate between X-rays emitted from ions inside the bulk and from ions experiencing a pure surface interaction. Another proof for the bulk interaction at high vertical velocity is the first observation of the two electron — one photon double Kα (or Kαα) emission with low energy MCIs. Auger-electron spectra emitted from hydrogenlike MCIs approaching a surface at very low velocities unveil new aspects of the atomic dynamics in front of the surface which may require the revision of previous models.
    Type of Medium: Electronic Resource
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