A new four-component multireference second-order perturbation theory with Dirac-Coulomb-Breit Hamiltonians is developed and benchmarked, finding a Breit correlation contribution of roughly 4% for xenon.
and Cooper, Brandon C
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Relativistic Dirac-Coulomb-Breit Four-Component Multireference Perturbation Theory within the Small Tensor Product Distributed Active Space Framework
A new four-component multireference second-order perturbation theory with Dirac-Coulomb-Breit Hamiltonians is developed and benchmarked, finding a Breit correlation contribution of roughly 4% for xenon.