A dielectric calculation of energy loss to valence electrons under channeling conditions

Abstract

The decrease in the contribution of valence electrons to the stopping power under channeling conditions has been evaluated by taking into account the Fourier components with G ≠ 0 of the response function: explicit calculations were carried out in the weak-binding limit. The particular case of 100 keV protons travelling at the center of [001] channel in gold has been calculated in detail. The decrease in the valence electron contribution to the stopping power in channeling, turns out to be much smaller than the decrease of local electron density at midchannel axis. These results are in reasonable agreement with the experimental ones obtained in this laboratory.