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A calculation of correlation energies of some He-like and Ne-like ions is presented. In the calculation the experimental values and the relativistic corrections to the total energies are used. The Hartree-Fock energy for Al⁺³ is calculated using analytic wave functions. A short discussion of the relativistic corrections and of a semiempirical formula for the correlation energies in atoms and ions is given.
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Anders Fröman (1958) studied this question.
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