Production of He⁺(2p) in collisions of He with energetic H⁺, H₂⁺, H₃⁺ions and electrons

Abstract

Total cross sections for the production of He+(2p) in collisions of H+ and e- with He at energies from 75 to 800 keV and from 0.8 to 7 keV respectively were measured. The ratio of the cross sections for He+(2p) production and for single ionization is discussed to investigate the contribution of electron correlations in the two-electron transition leading to He+(2p). For the first time the impact of H2+ and H3+ ions in comparison with H+ impact has also been studied for the energy range mentioned above.