Theoretical investigation of transfer-loss process in 0.2–2 MeV/u collisions of O5+ ions with H2 and He targets

Abstract

We report first calculations of transfer-loss probabilities and differential cross-sections performed within the framework of the independent particle model (IPM) for the process: O 5+ (1s 2 2s)+He→O 5+ (1s2s2p 4 P)+He + +e − For the projectile final state there exist three 1s2s2p alternatives, with the spectroscopic notation 4 P, 2 P − and 2 P + . One of the possible mechanisms resulting in these final states, which is expected to be dominant at the lower collision energies is the so-called transfer-loss (TL) process in which a projectile 1s electron is ionized with the simultaneous transfer of a target 1s electron to the projectile 2p shell. Our TL results for the production of the 4 P, are compared with older measurements by Toth et al. obtained using the method of zero-degree Auger projectile electron spectroscopy (Nucl. Instrum. Methods Phys. Res. B 124 (1997) 413). For both He and H 2 targets, the energy dependence is reproduced rather well. However, the TL calculations are smaller by a factor of 2, for the He data and by a factor of 20–50 for the H 2 data.