Abstract
Nonperturbative $R$-matrix and perturbative distorted-wave methods are used to calculate electron-impact ionization cross sections for ${\mathrm{C}}^{3+}$ in excited states. Convergence studies for the cross sections of the $1{s}^{2}5s$ excited configuration reveal that both the $R$-matrix and distorted-wave methods need fairly high ejected electron angular momenta. Reasonable agreement is found between the converged $R$-matrix and distorted-wave cross sections. Thus, the use of the computationally less demanding distorted-wave method as a tool for the $n$ scaling of excited-state ionization cross sections appears to be reasonable for atomic ions with charge $q\ensuremath{\geqslant}3$.
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