Energy losses of swift protons to hydrogen atoms

Full and reduced three-body classical trajectory Monte Carlo (CTMC) theory are used to calculate energy losses of the projectile in proton-hydrogen atom collisions as a function of impact energy. The total stopping power is presented along with partial contributions of the energy deposition among the channels of excitation, ionization and capture. Contributions of the projectile-electron and projectile-target nucleus interactions to the total stopping power are also investigated. Our results are compared with other theoretical calculations and experimental data. The present calculations verify that high order effects should be included for a proper description of electronic stopping power.