Abstract
The eigenchannel {ital R}-matrix method is used to describe a set of two-electron escape processes. This method is applied to calculate both bound state excitation and ionization cross sections for a simplified model of electron-hydrogen scattering and electron-He{sup +} scattering, in which only zero angular momentum states are considered. The results shown are calculated for incident electron energies ranging from 13.6--50 eV for electron-hydrogen scattering and from 54.4--200 eV for electron-He{sup +} scattering. A frame transformation technique is introduced to improve the stability of calculated ionization cross sections. The {ital R}-matrix results are compared with cross sections obtained from a convergent close-coupling approach and with other results.
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