An accurate numerical finite-element method (FEM) solution of the three-body Coulomb problem with two equal masses is presented. The application of the FEM to systems with mass ratios ranging from 1836 to 1/1836 yields upper bounds for energy eigenvalues to a precision in the range of 10^-11--10^-9 a.u. Expectation values for different operators are computed and discussed. {} 1996 The American Physical Society.
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Ackermann et al. (1996) studied this question.