Electron-impact ionization cross sections for U¹⁶⁺ and U⁸²⁺ are calculated in the distorted-wave approximation. Excitation-autoionization contributions are found to enhance the direct ionization cross section for U¹⁶⁺ by a factor of 3 in the threshold energy region. Excellent agreement is found between the calculated total ionization cross section for U¹⁶⁺ and recent crossed-beams experimental measurements. Only the direct ionization cross section for U⁸²⁺ is calculated since excitation-autoionization contributions are assumed to be small due to strong radiation field damping.
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Pindzola et al. (1989) studied this question.
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