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Core-valence correlation effects on the ground-state electron affinities of strontium and barium

The electron affinities of the ground states of Sr and Ba have been calculated using a finite-element multiconfiguration Hartree-Fock method. The valence correlation value for the electron affinity of Sr is 135 meV. Core-valence correlation reduces the electron affinity by 121 meV. By adding relativistic and core-core correlation contributions, the final binding energies of 16 and -6 meV are obtained for Sr-(2)P(12)/ and Sr-(2)P(32)/, respectively. For Ba, the valence limit is 279 meV, and the core-valence correlation correction is -144 meV. The final binding energies of 113 and 56 meV are obtained for Ba-(2)P(12)/ and Ba-(2)P(32)/ by adding relativistic and core-core correlation corrections to the core-valence correlation value.