Accurate lower bounds for the nonrelativistic lowest triplet states of 4He and ∞He and the He isoelectronic series up to Z = 10 were calculated by the method of variance minimization using wave functions with logarithmic terms. Furthermore, the method of Lehmann/Goerisch was extended to self‐adjoint operators with an essential spectrum. Both methods were compared for 4He.
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Kleindienst et al. (1992) studied this question.
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