Theory of emission-angle-dependent Auger transitions in ion-atom collisions

By means of a continuum distorted-wave approximation of the post-collision state we derive an analytical equation for the Auger emission amplitude in ion-atom collisions. This theory includes previous models as particular cases. We further show that the presence of the projectile strongly affects the intensity profile, giving rise to a dependence on the emission angle that is missed in previous theories. In particular, a sharp enhancement in the forward direction is computed. (author)