Stopping power for hydrogen molecular ions in solids: Influence of the inner-shell electrons of target atoms

We present calculations of the electronic stopping power for hydrogen molecular ions H₂⁺ in solids. These calculations include contributions from both valence electrons and inner-shell electrons of target atoms with the linear dielectric theory and the local-density approximation method. The screened Coulomb potential is used to describe the repulsion process of the two protons. The values of the stopping-power ratio Q for H₂⁺ at the high velocities are decreased, obviously due to the contributions of the inner-shell electrons. The theoretical results are compared with some experimental data.