Comparative study of the stopping power of graphite and diamond

Abstract

The stopping cross section of graphite and diamond for hydrogen and helium projectiles in the energy range 20\ensuremath{\leqslant}E\ensuremath{\leqslant}80 keV/amu has been measured. It is found that in the case of graphite the stopping cross section for protons is up to 40% larger than that of diamond, while for He projectiles the difference is about one-half of that. The results are explained using the charge-state approach to stopping, that includes in an approximate manner the energy loss in charge-exchange processes and a simple model for the valence-electron excitations of the two allotropic forms of carbon.