Abstract:By the use of projection operators, defined in Dirac space, it is shown how a relativistic pair equation, correct to order a2 Ry, can be constructed. It is pointed out how the Brown-Ravenhall disease (continuum dissolution) is rigorously avoided with this procedure. The pair equation treats correlation relativistically starting from a suitable choice of a fully relativistic one particle description of the atom. Second order contributions to the energy from the electrostatic correlation have been calculated for… Show more
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