Stopping cross section in the low- to intermediate-energy range: Study of proton and hydrogen atom collisions with atomic N, O, and F - art. no. 052714

We report electron-nuclear dynamics calculations of energy loss, charge exc hange, and nuclear, electronic, and total stopping cross sections for proto ns and hydrogen atoms incident on atomic nitrogen, oxygen, and fluorine tar gets for projectile energies from a few eV up to 25 keV. Particular emphasi s is placed on the analysis of the impact parameter and charge-exchange dep endence of the energy loss. It is found that at low energies the electronic stopping is not proportional to the projectile speed, but depends on the e xcitation spectrum of the target, manifested by having a threshold or a sec ond maximum in the stopping cross section at low projectile energy. Agreeme nt with other calculations and the available experimental data is good.