The role of projectile double scattering in positron-atom collisions

The process of electron capture to the continuum (ECC) can be explained as a result of the special case of ionization, where the ionized target electron is strongly influenced by the outgoing projectile. It was shown that the most important mechanism for ECC is the Coulomb focusing of ejected target electron in the direction of the projectile and the peak occur for positron impact as well in the triple-differential cross sections. Model calculations within the framework of classical trajectory Monte Carlo (CTMC) method are performed. (R.P.)