Phys. Rev. A 60, 4461–4475 (1999)Bound-state formalism for positroniumReceived 15 April 1998; revised 1 March 1999; published in the issue dated December 1999 In this work, a bound-state formalism appropriate for the study of positronium is presented. The formalism is based on a three-dimensional “quasipotential” equation derived from the Bethe-Salpeter equation. A reference kernel is proposed that contains the main physics of the nonrelativistic Coulomb bound state, and for which the quasipotential equation can be solved exactly. A perturbation theory for energy levels and decay rates based on this reference problem is described. © 1999 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.60.4461
DOI:
10.1103/PhysRevA.60.4461
PACS:
36.10.Dr, 11.10.St, 12.20.-m
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