ELECTRON-CAPTURE INTO ARBITRARY N,L LEVELS OF FAST PROJECTILES

The approach to electron capture previously developed by the authors is extended to describe the capture of hydrogenic ls electrons into arbitrary hydrogenic n,l excited states of fast projectiles. A simple formula for n,l distributions is derived. Capture occurs mainly into states around nres ZpZt (Zt and Zp are the target and projectile charges) and l nres-1. The n,l distributions for O8++H (1s)O7+(nl)+H+ and for O8++He(1s2)O7+(nl)+He+(1s) are graphically displayed as representative examples. For the reactions H++H(1s)H(nl)+H+ and H++He(1s2)H(nl)+He+(1s) (nl=2s,2p,3s,3p,3d, and 4s), good agreement is obtained with experimental cross sections. © 1979 The American Physical Society.