Energy of 1s2snp 4P states for the lithium isoelectronic sequence

The nonrelativistic energies of the core-excited 1s2snp 4P (n = 2,3,4,5) states for the lithium isoelectronic sequence from Be II to O VI are calculated with a full core plus correlation method using multiconfiguration interaction wavefunctions. The relativistic and mass-polarization effects on the energy are evaluated as the first order perturbation theory. The predicted energies are lower than other theoretical results. They show that this full core plus correlation method is useful for the core-excited systems