Electron-electron interactions in K-shell excitation of F6+ ions in fast collisions with H2 targets

Abstract

K‐shell excitation of F6+(1s22s) projectile ions in collisions with H2 targets has been studied by measuring 0° state‐resolved Auger electron production cross sections in the projectile energy range of 0.25 to 2 MeV/u. Projectile 1s→2p excitation due to the interaction with a ‘‘target electron’’ (electron‐electron Excitation1 [eeE]) has been observed in the production of the 1s(2s2p3P)2P− and 1s(2s2p1P)2P+ states as well as 1s2s2p4P state above the electron impact threshold. Projectile excitation is also produced by the target nucleus (electron‐nucleus Excitation [enE]) for the 2P± states. The eeE and enE cross sections were evaluated by Impulse Approximation (IA) and PWBA, respectively. The total KLL Auger electron production cross sections were also determined and exhibited the overall electron‐electron interaction effects of eeE and Resonant‐Transfer Excitation (RTE) which, in particular, is the 1s→2p excitation with 2p capture to result in 1s2s2p2 3,1D states.