State-selective one-electric capture by 8 keV He2+ions in collisions with oxygen atoms

The authors have successfully demonstrated the feasibility of using translational energy spectroscopy with partially dissociated oxygen within an iridium tube furnace to provide, for the first time, data on state-selective one-electron capture in collisions of 8 keV He2+ ions with ground state atomic oxygen. Near-resonant electron capture into the He+ (n=2) states is the dominant collisional channel. Cross sections for the main excited product channels in one-electron capture in collisions of He2+ with both O and O2 have been estimated from an analysis of the observed energy change spectra; the total cross section for one-electron capture by He2+ in O has also been determined.