The fully correlated calculations in Hylleraas coordinates for the nonrelativistic ground-state energy and the first three S-wave resonances of positronium hydride are reported. For the resonances, the positions and widths are determined using the method of complex-coordinate rotation. Our results significantly improve previous work. For example, the ground-state energy is about five parts in 10⁹ in accuracy, the lowest variational upper bound reported to date. A comparison with other previous work is made.
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Yan et al. (1999) studied this question.
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