Intermediate-velocity atomic collisions. IV. Ar K-shell ionization and capture by C5+ and C6+ ions.

Abstract

Ar K x rays produced by 22- and 42-MeV ${\mathrm{C}}^{5+}$ and ${\mathrm{C}}^{6+}$ ions were measured in coincidence with the various emergent charge states resulting from the collision process. Single-electron K-shell capture and ionization cross sections are obtained through an analysis based on the independent-particle model (IPM). The comparison among various theoretical models and the present experiment shows that the present theoretical description of the electron capture is more precarious than that of ionization in the intermediate-velocity regime studied. The IPM analysis also allows one to obtain estimates of the probability of ${\mathrm{C}}^{5+}$ electron loss for small-impact-parameter collisions.