Helium ionisation by high-energy ions at a function of impact parameter and projectile scattering angle

Abstract

The author considers the single ionisation of helium by ions in the Born approximation. The target initial and final states are represented by Hartree-Fock-Slater functions. The author calculates the ionisation probability for a given impact parameter as a function of the energy and ejection angle of the electron. A similar work is also carried out as a function of the projectile scattering angle. The author shows that the projectile scattering is determined by both the projectile-electron and projectile-target-nucleus interactions for scattering angles of the order of 1 mrad. For these small angles, there is no simple relation between the variation as a function of impact parameter and scattering angle.