Abstract
A modification of the impulse approximation for capture to continuum is used to describe the ejection of loosely bound target electrons by heavy ions. In contrast to the currently applied elastic scattering models based on the binary encounter approximation, the present model treats only the short-range part of the ionic field within the elastic scattering theory, but uses the more sophisticated impulse approximation for the Coulomb tail of the interaction potential. Calculations have been performed for Bq+, Feq+, Auq+ and Uq+ colliding with helium at energies between 0.5 and 6 MeV/amu. The comparison with absolute experimental spectra shows that theory works well for light projectiles, being able to describe the intensity and its variations with ionic chargeq ion in the binary encounter peak region. For very heavy low-energy projectile ions the intensity is, however, seriously under-predicted at small emission angles, indicating a breakdown of perturbative treatments.
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Jakubaßa-Amundsen, D.H. A quasielastic scattering approximation for target ionisation by heavy structured projectiles. Z Phys D - Atoms, Molecules and Clusters 34, 9–20 (1995). https://doi.org/10.1007/BF01443732
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DOI: https://doi.org/10.1007/BF01443732