Measurements of the cross sections for single and double ionization of helium as well as for the creation of H 2 + and H + ions from H 2 for impact of antiprotons in the energy range 13-500 keV are presented. The results are compared with our earlier, less accurate data and with data for equivelocity proton impact. The single ionization cross section of helium agrees remarkably well with a continuum distorted wave (CDW-EIS) calculation. The ratio between the double and the single ionization cross sections of helium increases dramatically with decreasing projectile energy. New theoretical calculations are called for.
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Hvelplund et al. (1994) studied this question.
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