Distorted-wave Born approximation for the ionization of molecules by positron and electron impact

Theoretical DWBA (distorted-wave Born approximation) cross sections for the ionization of several molecules by positron and electron impact are compared. In this work we study the effect of the projectile charge sign on the ionization cross sections when positron and electron projectiles are considered. The exchange interaction effect in case of electron projectile on the cross section is also discussed.