Triple differential cross section calculation for the helium autoionization by electron impact

The triple differential cross section and autoionization a and b parameters, as functions of ejected electron angle, have been calculated for the helium (2s2)1S, (2s2p)1P and (2p2)1D resonances in the coplanar asymmetric (e, 2e) reaction for the incoming electron energy/scattering angle kinematical conditions of 400 eV/16o, 200 eV/13o and 100 eV/13o. Configuration interaction expansions for the resonances and helium ground state which employed hydrogenic and multiconfiguration Hartree-Fock orbitals, were used in the present study. The distorted wave Born approximation, with exchange, was employed for the (e, 2e) cross section calculation. (author)