RELATIVISTIC AB-INITIO INTERPRETATION OF L-K VACANCY SHARING IN ION-SOLID-TARGET COLLISIONS

The first experiments measuring the impact-parameter-dependent L-K vac ancy sharing in ion-solid-target collisions started almost two decades ago. A rather qualitative explanation of the vacancy sharing process was achieved in the framework of the 2p pi-2p sigma coupling scheme de veloped by Briggs and Taulbjerg, but for most of the collision systems significant discrepancies remained. Even a multiple collision calcula tion using the 2p pi-2p sigma coupling scheme, as undertaken by Schuch et al., did not improve the agreement with the experimental results a nd left a lack of an explanation, calling for first-principles calcula tions. Using our ab initio relativistic Dirac-Fock-Slater many-electro n basis set method, we confirm that both a qualitative and quantitativ e explanation can be given for the L-K vacancy sharing process in heav y ion-solid-target collisions. As an example, we compare our results w ith measurements for 108-MeV Br on Ni-solid targets.