Abstract
Møller-Plesset perturbation theory is developed to second order for a selection of Kramers-restricted Dirac-Hartree-Fock closed-and open-shell reference wavefunctions. The open-shell wavefunctions considered are limited to those with no more than two electrons in open shells, but include the case of a two-configuration SCF reference. Denominator shifts are included in the style of the OPT2 method of Murray and Davidson, but with a modification which avoids the orbital dependence of the original formulation. An implementation which uses unordered integrals with labels is described, and application to the ground state of the O 2 molecule is presented.
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