Electronic relativistic effects onL-shell ionization of atoms by light-ion impact

The $L$-shell ionization cross sections by charged-particle impact have been calculated in the plane-wave Born approximation, using relativistic hydrogenic wave functions for the target electrons. The effects of the binding-energy increase due to penetration of the projectile and the Coulomb deflection of the projectile are taken into account. The calculated values are compared with the corresponding values obtained by other theoretical models as well as the experimental data. It is found that the present theoretical predictions are in satisfactory agreement with the experimental results for low-energy protons.