Abstract
Electron-impact double and triple ionization (TI) is investigated for the Se3+ ion by performing level-to-level calculations. It is demonstrated that ionization-autoionization, excitation double-autoionization, direct double ionization (DDI), and resonant-excitation triple-autoionization contribute to the total double ionization process. The ionization–ionization (II) branch plays the main role in the DDI process. The excitation-II part of DDI with subsequent autoionization dominates in the formation of the Se6+ ions. The contribution to the TI cross sections from the II process is not observed. The correlation effects considered for the 3p shell ionization open the way for the TI.
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