Measuring Density-Driven Errors Using Kohn–Sham Inversion
- Seungsoo NamSeungsoo NamDepartment of Chemistry, Yonsei University, 50 Yonsei-ro Seodaemun-gu, Seoul 03722, KoreaMore by Seungsoo Nam
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- Suhwan SongSuhwan SongDepartment of Chemistry, Yonsei University, 50 Yonsei-ro Seodaemun-gu, Seoul 03722, KoreaMore by Suhwan Song
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- Eunji Sim*Eunji Sim*Email: [email protected]Department of Chemistry, Yonsei University, 50 Yonsei-ro Seodaemun-gu, Seoul 03722, KoreaMore by Eunji Sim
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- Kieron BurkeKieron BurkeDepartments of Chemistry and of Physics, University of California, Irvine, California 92697, United StatesMore by Kieron Burke
Abstract

Kohn–Sham (KS) inversion, that is, the finding of the exact KS potential for a given density, is difficult in localized basis sets. We study the precision and reliability of several inversion schemes, finding estimates of density-driven errors at a useful level of accuracy. In typical cases of substantial density-driven errors, Hartree–Fock density functional theory (HF-DFT) is almost as accurate as DFT evaluated on CCSD(T) densities. A simple approximation in practical HF-DFT also makes errors much smaller than the density-driven errors being calculated. Two paradigm examples, stretched NaCl and the HO·Cl– radical, illustrate just how accurate HF-DFT is.
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