Simultaneous Electron Capture and Excitation in S + Ar Collisions

Electron capture accompanied by simultaneous K-shell excitation has been observed for 70-MeV S¹³⁺ + Ar collisions. This process is analogous to dielectronic recombination for the case of free electrons incident on highly charged ions. In addition, radiation following capture into high-n states without accompanying excitation is measured for charge states q=14+ to 16+. The results are used to determine the fraction of capture events which result in K-shell radiation, and the fraction of K x rays resulting from capture events.