Abstract
Two-photon (2E1) decay rates are calculated for metastable 3dj states in Ca+, 4dj states in Sr+ and 5dj states in Ba+ to evaluate contributions of these transitions to the corresponding lifetimes. The calculations are carried out using the relativistic single-double method, where single and double excitations of Dirac–Fock wavefunctions are included to all orders of perturbation theory. We find that lowest-order calculations of the two-photon rates are strongly modified when correlation corrections are included.
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