Abstract
Electron-impact ionization cross-sections for all atomic ions in the Sn and Xe isonuclear sequences are calculated using a semi-relativistic configuration-average distorted-wave method. Contributions to the cross-sections are included from both direct ionization and indirect excitation-autoionization. Branching ratio calculations are carried out for Cu-like Sn 21+and Xe 25+ and Na-like Sn 39+ and Xe 43+ to determine when best to ignore indirect excitation-autoionization contributions due to radiation damping along the isonuclear sequences. Although experiments exist for Xe through to Xe 6+, Xe 8+, and Xe 43+ the configuration-average distorted-wave results only agree well with the Xe 8+ measurements, once metastable states are taken into account and with the Xe 43+ measurements once radiation damping of the excitation-autoionization contribution is accounted for. Temperature-dependent rate coefficients are calculated for each Sn and Xe ionization stage and then put in a collisional-radiative format that should prove useful in modelling astrophysical and laboratory plasmas.
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