Production of recoil ions Heⁱ⁺ accompanied by single electron loss of 0.2--7MeV C^q+ and 0.25--5MeV O^q+ (q=1--4) ions

Target ionization accompanied with projectile electron loss is investigated for 0.2--7 MeV C^q+(q=1-4) with He and 0.25--5 MeV O^q+(q=1-4) with He collisions. For projectile single-electron loss channel, the He double-to-single ionization ratio R is nearly independent of projectile charge state but dependent on the nuclear charge of projectile Z_p. The results are analysed with atomic structure qualitatively. So far there have not existed the experimental data comparable with our results, to our knowledge. The ratio R is interpreted in terms of the two-step mechanism. This analysis agrees well with similar experiments in the literature.