A study of scattered ion charge states for Kr n+ -Kr collisions ( n = 1, 2, 3, 4 and 5)

Abstract

The final ionization states have been measured for Kr ions scattered to 1, 2, and 4° from Kr targets for selected incident ion energies from 0.4 to 1.4 MeV. For projectile states ranging from 1 to 5 the average final scattered charge state is observed to have only a weak dependence on the initial charge state. For example, for 1.4 MeV, 4° scattering the average final charge state for Kr +-Kr collisions is 10.2 and for Kr 5+-Kr it is 10.3. For 0.7 MeV, 1° scattering the final charge states ranged from 4.8 to 5.3 for incident charge states from 1 to 4. It is not clear for these very heavy ion-atom collisions that existing models provide an appropriate description of the ionization processes that give rise to the observed final charge states.