ABSTRACT
Ionization of atoms by electron impact has been widely studied. In this ( e,2e) reaction, three unbound charged particles interacting through Coulomb potentials occur in the final channel. As an exact quantum solution for this three-body problem is not known yet, several theoretical approximations have beeu developed. Among them, the first order of a Born series (FBA) in which the incident and the scattered electrons are represented by plane waves. A more sophisticated approximation (hereafter referred as BBK) [2] to study ionization of H atoms was developed by approximating the exact final wave function by a product of three Coulomb functions. Consequently, the correlate motion of the particles interacting through long range potentials in the final state is considered in a proper way. A previous version of this model was introduced for impact of ions [3]. BBK results were in agreement with the available experimentctl results of triple differential cross sections (TDCS) for atomic H [4].
