We present measurements of the stopping power of 800-keV 4He ions channeled along the Si(100) axis, as a function of the incidence angle. We compare the experimental results with theoretical calculations by using the impact-parameter-dependent energy loss obtained from the solution of the time-dependent Schro¨dinger equation through the coupled-channel method. This nonperturbative calculation provides reliable energy-loss results which are in good agreement with the experimental results.
Physical review. B, Condensed matter. New York. Vol. 55, no. 7 (Feb. 1997), p. 4332-4342