Excited States Of Positronium From The Two Body Dirac Equations Of Constraint

The binding energies of the excited states of positronium are calculated using the two body Dirac equations of constraint formalism. The results from nonperturbative evaluation are compared to those from perturbative evaluation. The equations for decoupled sates with J=0 are compared to an alternate formulation of the model. Some misprints in the literature are identified and corrected.