Relativistic many-body calculations of [2p53d]J=1excited-state energy levels for neonlike ions

Energies of the [2${\mathit{p}}^5$3d${]}_{\mathit{J}=1\mathrm{}}$ excited states of neonlike ions with nuclear charges in the range Z=10-92 are evaluated using an all-orders method based on relativistic many-body perturbation theory. The calculation starts from a multiconfiguration Hartee-Fock (HF) wave function, and includes correlation corrections from both the Coulomb and Breit interactions. The dominant correlation corrections, which are those associated with the 2p hole state, are treated to all orders. Reduced-mass and mass-polarization corrections are computed up to first order. The electron self-energy, the vacuum polarization, and the frequency-dependent Breit interaction are also included in first order, using a local potential that approximates the ${\mathit{V}}^{\left(\mathit{N}\mathrm{-}1\right)}$ (HF) potential. Comparisons are made with existing measurements and with other calculations. © 1996 The American Physical Society.