Zeitschrift für Physik A Atoms and Nuclei

, Volume 313, Issue 4, pp 281–288 | Cite as

3dσ excitation in slow Ne-Ar collisions

  • R. Shanker
  • R. Hippler
  • U. Wille
  • R. Bilau
  • H. O. Lutz
Atoms

Abstract

The impact parameter dependence of ArL-shell excitation in Ne-Ar collisions has been studied at collision energies of 200, 400 and 700 keV. Experimental vacancy production rates have been obtained by observing Ar-L Auger electrons in coincidence with scattered ions. A theoretical analysis of the experimental data has been performed by assuming vacancy production in the quasimolecular 3 orbital to be the dominant mechanism for ArL-shell excitation. Probabilities have been calculated separately for 3 excitation via 3-3-3 rotational coupling and via direct coupling to the continuum. The data at large impact parameters (where the calculated contribution from direct ionization is negligibly small) can be understood solely in terms of rotationally induced 3 excitation. The enhancement of the vacancy production rate over the rotational-coupling contribution observed for smaller impact parameters is explained qualitatively by the onset of direct 3 ionization. Total cross sections for Ar-L vacancy production have been determined experimentally for collision energies ranging from 70 to 700 keV, and have been analyzed also in terms of 3 excitation.

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Copyright information

© Springer-Verlag 1983

Authors and Affiliations

  • R. Shanker
    • 1
  • R. Hippler
    • 1
  • U. Wille
    • 2
    • 3
  • R. Bilau
    • 1
  • H. O. Lutz
    • 1
  1. 1.Fakultät für PhysikUniversität BielefeldFederal Republic of Germany
  2. 2.Bereich Kern- und StrahlenphysikHahn-Meitner-Institut für Kernforschung Berlin GmbHGermany
  3. 3.Fachbereich PhysikFreie Universität BerlinGermany

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