Abstract
We have calculated total and single differential cross sections for electron impact ionization of using a method that combines the distorted-wave Born approximation for the incident/scattered electron with an R-matrix treatment of the system. Our calculation included eight states of the final ion, namely , and six states with the configuration , and up to the -pole component of the interaction between the ionizing electron and the target. The single differential cross sections exhibit considerable structure due to autoionizing resonances, including a large resonance due to the quasi-bound state . In the calculation of the total cross section, a modification to the usual half-range approximation is proposed, which ensures that the contributions from autoionizing resonances have the correct thresholds. Our theoretical results for the total cross section are in good agreement with the experimental results.
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