Eikonal Approach to Break-Up Processes of Hydrogen-Like Ions by Electron Impact; Exchange of Electrons

抄録

The Coulomb-eikonal approximation is applied to evaluate the electron exchange amplitude in the ionization of hydrogen-like ions by an electron impact. This amplitude is reduced to a three-dimensional integral expression suitable for numerical calculations. The cross section including the contribution of the electron exchange is calculated for the ionization of He⁺, whose results show a reasonable agreement with experimental results. The exchange effect is found to be important in the ionization process in the intermediate as well as in the low energy region.