Abstract
The frequency-independent Breit interaction is treated self-consistently in Dirac-Fock Gaussian basis set calculations on the Be atom and Ne 6+, Ar 14+ and Sn 46+ ions. The results of the calculations on Be are in excellent agreement with both Desclaux's benchmark numerical perturbative calculations and the Slater basis set calculations of Quiney, Grant and Wilson. The Gaussian basis set calculations yield accurate results for the highly ionized systems, and show none of the signs of near-linear dependence difficulties reported with Slater basis sets.
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