Phys. Rev. A 80, 052507 (2009) [8 pages]Hylleraas-configuration-interaction study of the 2 2S ground state of neutral lithium and the first five excited 2S statesReceived 15 September 2009; published 19 November 2009 High-precision Hylleraas-configuration-interaction (Hy-CI) method variational calculations are reported for the 2 2S ground state of neutral lithium. The nonrelativistic energy is calculated to be −7.478 060 323 451 9 hartree, demonstrating that the Hy-CI technique is capable of sub-nanohartree accuracy for three-electron systems. A Hylleraas expansion without linked products of odd powers of rij gives −7.478 060 323 452 hartree, showing the relative unimportance of such terms for lithium at the nanohartree level of accuracy. Hy-CI calculations are also reported for the 3 2S, 4 2S, 5 2S, 6 2S, and 7 2S lithium excited states. © 2009 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.80.052507
DOI:
10.1103/PhysRevA.80.052507
PACS:
31.15.−p
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