Ground-state correlation energies for two- to ten-electron atomic ions.

Improved estimates of the nonrelativistic stationary nucleus correlation energies of the ground-state atomic ions with three to ten electrons and {ital Z} up to 20 are derived by combining experimental data and improved {ital ab} {ital initio} calculations. Unlike previous work in this area, we focus on the correlation contribution to individual ionization energies, computed by comparing experimental data with relativistic complete-valence-space Hartree-Fock energies.