| Abstract: | The nonrelativistic energies for 1s2ns and 1s2np(n=6,7,8 and 9) states of the lithium isoelectronic sequence from LiⅠ to NeⅧ are calculated by using a full core plus correlation (FCPC) method with the multiconfiguration interaction wave function. Relativistic and mass-polarization effects on the energy are evaluated as the first-order perturbation theory. The quantum electrodynamic (QED) correction to the energy is also included by using effective nuclear charge. For Z≤7, our excitation energies are in close agreement with experiment, and the discrepancies between our results and those of experiment are less than 1 cm-1 in most cases. The fine structures are determined from the expectation values of the spin-orbit and spin-other-orbit operators, and the results agree closely with experiment. |
