Cascade-induced asymmetry in Auger-electron emission following fast ion-solid interactions.

The angle and energy dependence of electron emission following the interaction of normal-incidence 70- to 170-MeV Ne/sup q//sup +/ (a = 7,10) projectiles with thin carbon foils has been investigated experimentally. An enhancement of the target KLL Auger-electron emission was observed for forward ejection angles. Model calculations yield results in qualitative agreement with the observed Auger-electron anisotropies. The theoretical results predict a significant enhancement of target inner-shell ionization near the exit surface due to highly energetic secondary electrons.