IMPACT PARAMETER DEPENDENCE OF ELECTRONIC-ENERGY LOSS FOR HEAVY-IONS AT LOW-VELOCITY

The impact parameter dependence of electronic energy loss for heavy io ns colliding at low velocity with atoms has been studied using the she ll-wise local electron-density model. Roothaan-Hartree-Fock wave funct ions are used to calculate the local electron density of the atoms stu died. The Brandt-Kitagawa effective stopping power charge theory is mo dified to incorporate the effective charge obtained using Fermi-level scattering phase shift calculations based on the density-functional fo rmalism. The theoretical results are compared with available experimen tal measurements.