Relativistic Calculations of the ls-2s Excitation Cross Sections of Hydrogen-Like Ions by Heavy-Charged Particle Impact

The cross sections for the is-2s excitation of hydrogen-like ions by heavy-charged particle impact have been calculated using the relativistic wave functions for the target electron in the Born and dis-tortion approximations. The obtained results are compared with the nonrelativistic values. It is found that the electronic relativistic effect in the ls-2s excitation is less important than in the K-shell ionization. The effect of increased binding energy due to presence of the projectile is discussed by comparing the cross scetions in the Born approximation with those in the distortion approximation