Energy partitioning in multiply ionizing collisions of C 6+ ions with Ne

Abstract

The 10 MeV (0.83 MeV/u) C 6+ +Ne collision system is studied in order to illustrate the partitioning of the energy loss of the projectile in multiply ionizing collisions. The n-body classical trajectory Monte Carlo method is employed to determine (i) stopping powers, (ii) total cross sections as a function of recoil ion charge state and (iii) differential cross sections as a function of the angle and energy of the ionized electrons for different recoil ion charge states. The ionized-electron spectra are found to be more sharply peaked near zero electron energy for low recoil ion charge states than for high. Also, ionized electrons associated with low recoil ion charge states are found to be scattered to larger angles than those associated with high charge states. The angular distributions of the recoil ions are also presented and are found to be broadly peaked about 90°. The calculated total cross sections, the energy loss as a function of the recoil ion charge state and the stopping powers, are in reasonable agreement with available experimental data.