Abstract
Cross sections for electron impact ionization from the 1s and 2s shells of He-like, Li-like and Be-like U ions have been calculated by the relativistic distorted wave method at incident electron energies up to five times the ionization energy. Differences between the results obtained using the Moller and Coulomb interactions are attributed to differences in the contribution from interference between direct and exchange ionization. Excellent agreement is obtained between the Moller result and an EBIT experimental result for He-like U at an incident electron energy of 198 keV.
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