Energies and lifetimes of the core-excited states of the Li isoelectronic sequence

The energies, fine structures, widths, and radiative rates of core-excited states of a Li isoelectronic sequence $(Z=4\char21{}14)$ are calculated using the saddle point and saddle-point complex-rotation methods. A restricted variational method is used to extrapolate a better nonrelativistic energy. Relativistic effects are included using first-order perturbation theory. The charged effects of the Li isoelectronic sequence are discussed. These results are compared with experimental and theoretical data in the literature.