Combined configuration-interaction-Hylleraas studies of atomic states. III. The four lowestS2and four lowestP2states of lithium

Combined configuration-interaction-Hylleraas method techniques have been employed in obtaining three-electron ${}_{}{}^2{}_{}{}^{}S$ and ${}_{}{}^2{}_{}{}^{}P$ wave functions. The four lowest $\left(1\mathrm{}{s}^{2}ns\right) {}_{}{}^2{}_{}{}^{}S$ wave functions are obtained in the same 150-term basis. The calculated energies are -7.478 02, -7.354 01, -7.318 40, and -7.303 40 a.u. compared to the respective corrected experimental results -7.478 07, -7.354 10, -7.318 53, and -7.303 55 a.u. In addition, the four lowest $\left(1\mathrm{}{s}^{2}np\right) {}_{}{}^2{}_{}{}^{}P$ wave functions are obtained in the same 120-term basis. The calculated energies are -7.410 05, -7.337 00, -7.311 74, -7.300 14 a.u. compared to the respective corrected experimental results -7.410 16, -7.337 16, -7.311 90, -7.300 30.