Subshell selective electron capture in collision of Oq+ ( q = 6, 7) with H 2, He at 10 q keV

Abstract

Absolute cross sections for electron capture into different ( n, l) subshells have been determined for O 6+ + He and O 7+ + He/H 2 collisions. The n = 4 level of O VI are predominantly populated, while the n = 3 and n = 4 of O VII are nearly equally populated. Transitions between doubly excited quartet states of O VI are observed, they are obtained by one electron capture on the 1s2s 3S O 6+ metastable state.