Prominent role of indirect processes in electron-impact ionization of Xe²⁴⁺ ions

The cross section for electron-impact single ionization of Xe²⁴⁺ has been studied both experimentally and theoretically. The cross section exhibits significant features from resonant ionization processes such as resonant-excitation double autoionization. These are well described by the theoretical calculations if the latter take into account excitations to atomic shells with principal quantum numbers of up to n = 39. (paper)