State-selective electron capture by O3+ ions on He and H2

Abstract

Using the cold target recoil ions momentum spectroscopy, we have studied single electron capture in collisions of O3+ ions with He and H2 at 60 keV. The state-selective, angular differential cross sections have been determined by measuring the transverse and longitudinal momentum of recoil ion. The dominant reaction channel is single electron capture into the O2+(2s2p3) and O2+(2s22p3l) states for He and H2 target respectively. The experimental results could be qualitatively understood by reaction windows of the classical over-barrier model.