Multiple ionization in fast ion-atom collisions: Simultaneous measurement of recoil momentum and projectile energy loss

We report on the fil st experiment that measures simultaneously the full mo mentum vector of recoil ions and projectile energy loss and scattering angl e in ion-atom collisions. We studied multiple: ionization in the collisions of 0.83-MeV/u O7+ with Ne. Recoil ions (Neq+, q = 1-8) were detected in co incidence with single capture to O6+. The results give the first experiment al evidence for the increase of the average electron energy with increasing recoil charge state q. The average ejection angle shows a dramatic decreas e with q. Results are compared with n-electron classical trajectory Monte C arlo calculations.