Total ionization cross section in electron-hydrogen scattering

Abstract

The total ionization cross section in electron-hydrogen scattering in the energy range 20.4-68.0 eV has been calculated by a method in which the initial state of the system is treated by a distorted wave polarized orbital method and the final state is described by (I) a product of two unscreened Coulomb functions and (2) a product of a plane wave and a Coulomb function. The corresponding two sets of results using a plane wave in the incident channel have also been reported. The present results where both the electrons are represented by Coulomb waves are in closer agreement than other theoretical predictions With measured values.

Positron-impact ionization of hydrogen atoms

“…The present findings necessarily suggest that the ionization cross section is extra sensitive to the choice of the final-state wave function of the system. In case of e--H ionization (12,15,16), the choice of the final-state wave function is less sensitive than the corresponding positron case. When the final-state wave functions are represented by two Coulomb waves, one in the attractive field and the other in the repulsive field, the destructive interferences between the two waves are expected to be responsible for this feature.…”