MULTIPLE VACANCY K-L-TRANSFER IN ION-SOLID TARGET COLLISIONS

Over the last decade several measurements on the K-L vacancy transfer in many-electron heavy ion-solid target collision systems were perform ed, although a theoretical ab initio understanding of these collisions has still not been achieved. In this letter we present the first calc ulations based on the solution of the time-dependent relativistic Dira c-Fock-Slater equation to both evaluate the mean excitation and ioniza tion of the projectile M- and L-shell, and to calculate the later tran sfer of these L vacancies to the K-shell. We found that all L-shell va cancies contribute to K-shell vacancy production. Comparision with exp erimental measurements carried out by Schuch et al for 10 MeV Si3+ on Al shows that these so-called solid target effects on impact-parameter -dependent charge transfer probabilities can be explained within the f ramework of our ab initio method.