Impact parameter dependence of K-shell ionisation in slow collisions of near-symmetric relativistic atoms

Abstract

The total K vacancy production probability of both collision partners in a heavy-ion-atom collision is calculated, assuming that two processes contribute, a single-collision process where 2p sigma and 2p pi vacancies are created by direct ionisation of the united atom and subsequently redistributed, and a double-collision process where a 2p pi vacancy is created in the first collision and partially transferred in the second. The model used for the single-collision process is valid for slow collisions between partners of a combined charge greater than 70. Numerical results are presented for the (I, I) and (I, Ag) systems and show improved agreement with recent experiments.