Abstract
A complete form of the post version of the continuum distorted wave (CDW) theory is used to investigate the single ionization of multielectronic atoms by fast bare heavy ion beams. The influence of the non-ionized electrons on the dynamic evolution is included through a residual target potential considered as a non-Coulomb central potential through a GSZ parametric one. Divergences found in the transition amplitude containing the short-range part of the target potential are avoided by considering, in that term exclusively, an eikonal phase instead of the continuum factor as the initial channel distortion function. In this way, we achieve the inclusion of the interaction between the target active electron and the residual target, giving place to a more complete theory. The present analysis is supported by comparisons with existing experimental electron emission spectra and other distorted wave theories.
Highlights
The present work deals with the single ionization of atoms by fast bare ion impact within the continuum distorted wave (CDW) [1] and the continuum distorted wave-eikonal initial state (CDW-EIS) [2] distorted wave theories
The CDW theory is revised in order to include the target dynamic screening through the consideration of target-potential residual terms that were previously neglected when working with the post version of the CDW
It is shown that the intrinsic divergences present in the transition amplitude of the prior version of the CDW are avoided when, in the post version, the target potential is approximated by an effective Coulomb one
Summary
The present work deals with the single ionization of atoms by fast bare ion impact within the continuum distorted wave (CDW) [1] and the continuum distorted wave-eikonal initial state (CDW-EIS) [2] distorted wave theories. In a previous work [14], we revisited the formulation of the post version of the CDW-EIS approximation, showing that the inclusion of an additional potential in the exit channel, which was neglected in the previous post version calculations, almost completely removes these discrepancies. This potential is associated with a first-order description of the dynamic screening produced by the passive electrons on the evolution of the active one. Atomic units will be used throughout this work unless otherwise stated
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