Abstract
Theoretical calculations of electron‐impact ionization and recombination in positively charged ions are reviewed and compared to cross section measurements. In the case of ionization, the contributions of excitation autoionization and resonant recombination followed by double autoionization are considered. The excitation‐autoionization contributions can dominate the total ionization cross section even for highly ionized species. In addition, we present the results of fully relativistic calculations of ionization cross sections obtained from lowest‐order QED theory for H‐like and He‐like uranium. Finally, we consider the contribution of dielectronic recombination (DR) to electron‐impact recombination. Comparison of theoretical calculations of DR for He‐like and Li‐like carbon and oxygen ions with recent high‐resolution, merged‐beam measurements, using the electron cooler at Aarhus, seem to indicate that total DR cross sections can be accurately determined from the isolated‐resonance approximation. The effects of electric fields on DR are briefly discussed.
Published Version
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