Ionization of H2 and He in collision of 3 keV electrons and the Bethe binary-encounter peak

We have studied the energy distributions of double differential cross sections (DDCS) of electrons emitted in single-ionization of H2 and He induced by 3keVelectron impact in the Bethe binary-encounter (BE) region for wide range of ejection angles.We compare the absolute cross sections for these two isoelectronic systems at high ejection energies. We demonstrate that while Compton profile causes undulation in the BE peak, the constructive interference effect enhances the overall cross section of H2 compared to that of atomic targets.