ON CLASSICAL CALCULATIONS OF THE ELECTRONIC STOPPING POWER AT INTERMEDIATE ENERGIES

The electronic stopping power for bare particles and antiparticles (Z( p) = +/-1, +/-2, +/-3) incident on atomic hydrogen has been calculated by using a full classical and quantum-mechanical description of the e nergy-loss processes. For this purpose we have applied the classical-t rajectory Monte-Carlo (CTMC) and the coupled-channel atomic orbital (A o) method. A comparison indicates that the classical results converge to the non-perturbative quantum-mechanical ones in the limit of strong projectile-induced perturbations, especially if the capture channels are of minor importance.