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Restricts DFT to low-Z closed-shell cases in practice; leaves open targeted functional development for high-Z or multireference systems.
Examples are given showing that present-day density functional theory (DFT) functionals give useful results for neutral closed-shell molecules of low atomic number. For high Z, high charge, or systems with large configuration mixing, present functionals are less useful.
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Ernest R. Davidson (1998) studied this question.
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