Electron Impact Double Ionization of Singly Charged Positive Ions

Abstract

Electron impact double ionization cross sections of C+ N+ O+ and Ne+ have been calculated in the modified double binary encounter model using accurate expression for σΔE (cross section for energy transfer ΔE) given by Vriens and Hartree-Fock velocity distributions for the target electrons. The focussing action of the target ion on the incident electron has been incorporated along the line suggested by Thomas and Garcia. Contributions of ionization- autoionization have been included in the calculations. The present results show satisfactory agreement with experimental data except at low incident energies.