Simultaneous L- and M-shell ionization of a 80Se target deduced from the analysis of energy shifts and relative intensities of K x-ray lines induced by various projectiles

Average energy shifts of K and K x-ray satellite lines and K/K intensity ratios have been experimentally evaluated for a 80Se target bombarded by various projectiles with atomic numbers in the region 3 Zp16 at a given projectile energy of 3.3 MeV/u. The data have been analysed using an approach, based on the results of extensive single-configuration Dirac-Fock (DF) calculations, performed within the multiconfiguration DF method for various distributions of holes in subshells of a 80Se ion. This provides information about the average number of holes in various subshells of 80Se ions at the time of emission of the K x-ray lines. The primary average number of L- and M-shell holes in a 80Se target produced at the moment of collisions with projectiles and the average ionization probabilities per electron for L and M shells have been deduced by means of a simple statistical scaling procedure which accounts for all processes that modify the number of L- and M-shell holes prior to the K x-ray emission. It has been found that the average ionization probabilities per electron for L and M shells increase considerably with Zp2. For larger Zp the average ionization probability per electron is significantly higher for M shells than for L shells. On the other hand, for small Zp the ionization probability per electron seems to be slightly higher for L shells than for M shells. Moreover, the dominant role of the simultaneous multiple ionization of L and M shells accompanying the ionization of a K shell has been observed for projectiles with Zp>3.