An extensive configuration-interaction calculation for the $(1s2s3s)$ ⁴S state of neutral lithium has been carried out in an effort to establish absolute term values for the low-lying quartet states with a few cm^-1 of accuracy. The lowest quartet state, (1s2s2p) ⁴Pᵒ is found to be 57.4128 (10) eV above the ground state 1s²2s, in apparent disagreement with a recent experimental value of 57.4420 (40) eV obtained from Ritz formulas applied to the ⁴D states of even and odd parity. The positions of all identified quartets have been recalculated from raw experimental data and new theoretical results.
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Bunge et al. (1978) studied this question.
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