Abstract
A configuration interaction wavefunction is obtained for the pseudo-atom positronium hydride (consisting of one proton, one positron, and two electrons), using Slater orbitals centered on the proton as basis functions. A positive dissociation energy is calculated for the process PsH → Ps + H. Comparison is made with previous calculations of this energy, and its actual value is predicted to be 0.009 au. The two-quantum annihilation rate also is calculated.
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