Abstract
Previous calculations concerning the ground state of twoelectron atoms, involving Ritz-Hylleraas expansions with half-integral powers, are continued through expansions involving 31 parameters. As far as can be judged from a comparison of the energies with those obtained with other expansions, the results continue to be favorable. Thus, already with 18 parameters, the computed energies for He and O VII differ from the best published values by 2 and 0.3 parts per million, respectively. Even better results are obtained for He with expansions involving both halfintegral and negative powers. A few initial results of calculations for the excited state 2 /sup 1/S are also presented. (auth)
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