K-SHELL VACANCY PRODUCTION AND SHARING IN (0.2-1.75) MEV/u Fe, Co + Cr COLLISIONS

摘要

K-shell ionization cross sections and mean vacancy sharing probabilities measured in the near-symmetric collision systems Fe and Co + Cr at 0.2 -1.75 MeV/u energies are reported. The cross section values have been corrected for multiple ionization in the outer (L, M) shells by using the energy and yield shift method. Mean ionization probabilities per electron in the outer shells have been estimated. Calculations in the Briggs model, using SCA with relativistic hydrogenic wave functions and binding correction, could explain the 2pσ -molecular orbital ionization cross sections at higher energies ( ≥ 1 MeV/u). The vacancy sharing results show that predictions of a two-state coupling Meyerhof-Demkov model is less fulfilled at higher energies ( ≥ 1.5 MeV/u).