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Charge transfer leading to multiple ionization of neon, sodium, and magnesium.

Absolute cross sections for proton and helium-ion impact on neon, sodium, and magnesium are presented. By using coincidence techniques cross sections for pure single- or double-electron capture are separated from those events where one or more ionizations accompany the capture process. In addition, information about the direct-ionization channel is presented. The present data are combined with previous experimental information to identify specific channels which contribute to the cross sections presented here.