Journal article

Convergence of the Breit interaction in self-consistent and configuration-interaction approaches

CT Chantler, TVB Nguyen, JA Lowe, IP Grant

PHYSICAL REVIEW A | AMER PHYSICAL SOC | Published : 2014

Abstract

Much discussion in relativistic atomic physics and quantum optics has related to the interaction of gauge and perturbation of the Hamiltonian or Dirac operator. It has been commented that Lorentz and gauge independence requires different forms of the perturbation operator in shifting from one gauge to another. Equally, it has been commented that gauge convergence is not possible without different operator forms in different bases and without the operator being embedded within the self-consistent kernel. We explore the logic and self-consistency of these arguments, applied to the well-known Breit operator in an area of continuing discussion. We find that convergence is now possible to a remar..

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