Non-relativistic energies for the low-lying quartet S states of lithium

Abstract

Variational energy eigenvalues for thethree lowest quartet S states oflithium 1s2s3s 4S, 1s2s4s 4S and 1s2s5s 4S arecalculated using multiple basis sets inHylleraas coordinates. The finite nuclearmass corrections to these energyeigenvalues are also calculated usingsecond-order perturbation theory.Expectation values of powers ofri and rij, as well as the expectation values ofthe kinetic energy operator, delta functionδ(ri), and the Fermi contactterm for these states are presented.