Correlation effects for double K-shell vacancy production in lithium by fast charged projectile impact

Correlation effects are studied theoretically in case of the production of Li+ S states with double K-shell vacancy in collision with 95 MeV/u Ar18+, 60 MeV/u Kr34+ and 0.1-5.0 keV electron projectiles. Calculations with no correlations, or only initial- and only final-state correlations are performed in order to identify the main correlation contributions and to emphasize the role of correlated wavefunctions. The relative importance of the various first- and second-order mechanisms and the dependence of the cross sections on the sign of projectile charge are investigated, too. In most cases the obtained results are in reasonable agreement with the experimental data available.