Abstract
Cross sections for the single ionization of Kr XI–XIX ions by electron impact arecalculated in the Coulomb–Born approximation by the code ‘ATOM’ andcompared with experimental data and other theoretical results for Kr XI, Kr XIIand Kr XIX. Single electron impact ionization is the sum of the contributionsfrom direct ionization and from excitation of the autoionizing levels. The first partincludes only ionization from the 3s, 3p and 3d shells since ionization from the 1s,2s, 2p shells results in double ionization. The autoionizing levels (1s22s2p63s23p63dm nland 1s22s22p53s23p63dm nl)decay via autoionization and finally contribute to single ionization. The results arefound to be in satisfactory agreement with the experimental results obtained in acrossed electron–ion beam experiment in the energy range from threshold toabout 6 keV. The case of ions formed in metastable states is studied as they wereobserved experimentally.
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