Polarization spectroscopy of O5+ (1s23p) states produced in the collisions of O6+ with He and H2

In this paper we describe polarization spectroscopy measurements of O5+(1s23p 2P3/2), following single-electron capture from He and H2. A novel arrangement for measurements of the polarization degree has been developed to reduce the systematic error. These measurements are shown as a function of projectile velocity, which was varied from 0.34 to 0.55 au. A simple model for the results with H2 is presented by considering the velocity dependence of capture cross sections for each 4l state and the cascade from 4l to 3p. However, for the case of the He target, no such simple model is found to be consistent with the experimental results.