Energies of 1s²ng and 1s²nh (n = 5, 6, 7, and 8) states for lithium isoelectronic sequence

The nonrelativistic energies for lithium isoelectronic sequence 1s ²ng and 1s²nh (n = 5, 6, 7, and 8) states from Z -3 to S are calculated by using a full core plus correlation (FCPC) method with multiconfiguration interaction wave functions. Relativistic and mass-polarization effects on the energy are evaluated as the first-order perturbation theory. Our predicted excitation energies are compared with previous experimental results in the literature.