Abstract
The continuum-distorted-wave eikonal initial-state (CDWEIS) model is used to study the ionization of hydrogen by protons of energy 10--500 keV. Ejected electron spectra are presented and discussed in the context of the saddle-point mechanism. The behavior of the ejected electron spectrum as the charge of the incident projectile is varied is also considered. It is concluded that within its range of validity, CDWEIS does not provide any evidence of the existence of saddle-point electrons.
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