Abstract
Distorted-wave methods have been used to calculate cross sections for electron-impact ionization of sodiumlike ${\mathrm{Ar}}^{7+}$ for collision energies ranging from near threshold to 1 keV. We included contributions due to excitation-autoionization and resonant excitation--double autoionization (REDA), as well as the contributions from direct ionization of the 3s electron and the n=2 inner-shell electrons. We find that the effects of radiative damping and loss channels reduce the REDA contributions by a factor of 4. We compare our calculated results to experimental results and to theoretical cross sections obtained in a close-coupling approximation. \textcopyright{} 1996 The American Physical Society.
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