Abstract
Continuum-state Hartree-Fock theory is applied to the calculations of the electron-impact excitation of positive ions. In order to illustrate the effects of continuum coupling as a function of ionization stage, we first consider the excitation of the valence electron in K-like ions and compare cross sections calculated in the close-coupling approximation with those calculated in the distorted-wave approximation. In addition, we consider distorted-wave calculations of the contributions of inner-shell excitation followed by autoionization to the electron-impact ionization cross sections of highly ionized Na-like ions, where coupling effects should be small, and compare our results with recent electron-ion crossed beams measurements of the total cross sections for these ions. Agreement between experiment and theory is found to be good, but the experiments indicate the presence of recombination-double-autoionization resonances that are not included in our calculations.
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