Relativistic and QED corrections to thegfactor of Li-like ions

Calculations of various corrections to the g factor of Li-like ions are presented, which result in a significant improvement of the theoretical accuracy in the region $Z=6--92$. The configuration-interaction Dirac-Fock method is employed for the evaluation of the interelectronic-interaction correction of order 1∕Z² and higher. This correction is combined with the $1∕Z$ interelectronic-interaction term derived within a rigorous QED approach. The one-electron QED correction of first order in α is obtained by employing our recent results for the self-energy term and by evaluating the vacuum-polarization contribution. The screening of QED corrections is taken into account to the leading orders in αZ and $1∕Z$.