We have calculated electron-impact ionization cross sections for Li-like Ar¹⁵⁺, Fe²³⁺, Kr³³⁺, and Xe⁵¹⁺ ions for incident electron energies between 3 and 4 times the ionization threshold using the relativistic distorted-wave and the multiconfiguration Dirac-Fock methods. The calculations include direct-ionization, excitation-autoionization and resonant-excitation-double-autoionization processes. There are many narrow resonances due to the excitation of the 1s2s3lnl' states. The effect of indirect processes persists to very highly charged ions in the isoelectronic sequence.
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Chen et al. (1992) studied this question.