Projectile neutralization in large-angle back-scattering of slow Fqþ, Neqþ and Arqþ incident on RbI(100)

The scattering of multi-charged ions (MCI) from the [1 0 0] surface of a RbI single crystal has been studied using a 120 back-scattering technique in the keV energy regime. Scattered charge-state distributions were measured as a function of the polar incidence angle and the target azimuthal orientation. Preliminary results indicate that ‘‘quasi-binary’ ’ collisions associated with scattering from a Rb or I site can be clearly distinguished for each scattered final charge state. The charge-state distribution and the relative Rb/I binary collision yields for scattered ions are found to depend on both the beam incidence angle and the target azimuthal orientation. The preliminary RbI(1 0 0) results are discussed in the context of earlier experimental and theoretical studies of MCI scattering on a Au(1 1 0) surface