Cross section for double lonization by electron impact: Li+, Na-1, K+

Abstract

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.