MEASUREMENTS OF RECOIL ION LONGITUDINAL MOMENTUM-TRANSFER IN MULTIPLYIONIZING COLLISIONS OF FAST HEAVY-IONS WITH MULTIELECTRON TARGETS

The longitudinal momentum transfer to the recoil ion in collisions of 1 MeV/amu bare F ions with Ne are resolved for final charge states of both projectile and recoil ions. We observe the recoil to be thrown ba ckwards in electron-capture events, reflecting the physical impact of the electron translation factor. The size of the momentum transfer is in agreement with classical trajectory Monte Carlo calculations for lo w charge state recoil ions but not for high charge state recoil ions.