Phys. Rev. A 65, 054501 (2002) [4 pages]Ground-state energies for helium, H-, and Ps-Received 12 November 2001; published 15 April 2002 A triple basis set in Hylleraas coordinates is used to obtain improved variational bounds for the nonrelativistic energy and other properties of He, H-, and Ps-. The accuracy, numerical stability, and computational efficiency are compared with recent work based on quasirandom basis sets. The Kato cusp conditions are used to assess the accuracy of the wave functions at short distances. © 2002 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.65.054501
DOI:
10.1103/PhysRevA.65.054501
PACS:
31.15.Pf, 31.25.Eb
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