Energy loss effective charge for slow ions in electron gas

Abstract

Within the linear response theory the electronic energy loss in the degenerate electron gas for the slow excited H- to Be-like ions was calculated. The results were compared with the characteristics for the ions in the ground state and with the experimental data. The ion was described by the Hartree–Fock–Slater formalism and the medium by the Lindhard dielectric function. The ion–electron screening, anti-screening are exchange effects were included in the model. The stopping power and the effective charges Zeff1 were found to depend on the one electron radius rs, on the ion atomic number Zi and on the number of electrons Ni carried by the ion.