Kinematical correction to the impulse approximation for high-energy binary (e,2e) collisions in He

A modification is proposed to the kinematical description of a binary-encounter collision, taking into account the $p$-dependent ($p$ is the initial momentum of the target electron) kinetic energy lost by the slow (ejected) electron while propagating out of the atomic potential. It is shown, at least for the high-energy asymmetric ($e$, $2e$) reaction on helium, that this correction leads to a "universal" representation of the data and to a remarkable agreement with experiment over a wide range of ejection energies and scattering angles.