The two-photon annihilation rate for positronium hydride is calculated with the use of extensive Hylleraas-type wave functions in which all six interparticle coordinates are used. The binding energy against dissociation into a positronium atom and a hydrogen atom is improved upon the previous best value by about 3.8%. The two-photon annihilation rate, calculated with a wave function that gives a positron-electron cusp value of -0.492a₀^-1 (compared with the exact value of -0.5a₀^-1), is determined as 2.459 nsec^-1.
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Y. K. Ho (1986) studied this question.
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