A theoretical study on electron angular distributions for (e,2e) processes on hydrogen

In this work the triple differential cross sections for electron impact ionization of atomic hydrogen at different energies are calculated by use of 3C and DS3C models. The structure of the cross sections is analysed. It is seen that the angular distribution basically consists of two peaks which can be assigned to the binary and recoil peaks. The shape and position of the two peaks depend sensitively on the detection geometry and the energy shared between the two electrons. Furthermore, the final-state electron-electron repulsion contributes significantly to the form of the observed angular distributions. For different collision geometry, the three-body interactions will control the interference pattern of various scattering amplitudes by different weighting between these amplitudes. In addition, the direct and exchange amplitudes are also considered.