The cross sections for double ionization by electronic impact on Li+, Na+, and K+ ions have been calculated using the Grysinski's semiclassical formula. Good agreement is obtained between calculated results and experiment in case of Li+, and it is expected that the results for Na+ and K+ would also be reliable. The ratio (σ+ / σ++) (single ionization/double ionization) is also calculated and compared with the experimental results and theoretical predictions.
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Tripathi et al. (1971) studied this question.
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