Cusp electron emission in 1.4 MeV u-1Xe26+ on Ar collisions as a function of the projectile final charge state

The cusp electron emission as a function of the final projectile charge state has been investigated by an electron-projectile coincidence technique in 1.4 MeV u-1 Xe26+ on Ar collisions. The cusp electron emission production probability varies strongly with the final projectile charge state. It is highest for projectile electron loss processes, increases for capture processes with the number of electrons captured by the projectile and is lowest in the pure ionization channel. The observed results can be qualitatively explained by the different impact parameter dependencies of capture, loss and ionization processes with respect to cusp formation. (author)