One-electron capture with simultaneous ionization in Cq+, Oq+ (q=1-4)-Ar collisions

Abstract The ratios R k 1 of k -fold to single ionization of the target atom with simultaneous one-electron capture by the projectile have been measured for 15–480 keV/u ( v p = 0.8 – 4.4 a.u. ) collisions of C q + , O q + ( q  = 1–4) with Ar, using time-of-flight techniques which allowed the simultaneous identification of the final charge state of both the low-velocity recoil ion and the high-velocity projectile for each collision event. The present ratios are similar to those for He + and He 2+ ion impact. The energy dependence of R k 1 shows a maximum at a certain energy, E max , which approximately conforms to the q 1/2 -dependence scaling. For a fixed projectile state, the ratios R k 1 also vary strongly with outgoing reaction channels. The general behavior of the measured data can be qualitatively analyzed by a simple impact-parameter, independent-electron model.