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Density-functional theory of the correlation energy in atoms and ions: A simple analytic model and a challenge
Physical review. A, General physics
A simple and accurate analytic model is derived for the correlation energy of any atom or ion within three densityfunctional approximations based on the uniform electron gas: the local-spin-density approximation (LSD), the selfinteraction corrected (SIC) version of LSD, and the antiparallel-spin LSD of Stoll et al. The last two approximations give good results for the correlation energies of neutral atoms, in contrast to LSD which overestimates these energies by a factor of 2. However, alldoi:10.1103/physreva.23.2785 fatcat:jdipte346zcylmws2ijxp3tmb4