Standard density functional approximations often give questionable results for odd-electron radical complexes, with the error typically attributed to self-interaction. In density corrected density functional theory (DC-DFT), certain classes of density functional theory calculations are significantly improved by using densities more accurate than the self-consistent densities. We discuss how to identify such cases, and how DC-DFT applies more generally. To illustrate, we calculate potential energy surfaces of HO·Cl− and HO·H2O complexes using various common approximate functionals, with and without this density correction. Commonly used approximations yield wrongly shaped surfaces and/or incorrect minima when calculated self consistently, while yielding almost identical shapes and minima when density corrected. This improvement is retained even in the presence of implicit solvent.
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14 May 2014
Research Article|
March 25 2014
Ions in solution: Density corrected density functional theory (DC-DFT) Available to Purchase
Min-Cheol Kim;
Min-Cheol Kim
1Department of Chemistry and Institute of Nano-Bio Molecular Assemblies,
Yonsei University
, 50 Yonsei-ro Seodaemun-gu, Seoul 120-749, South Korea
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Eunji Sim;
Eunji Sim
a)
1Department of Chemistry and Institute of Nano-Bio Molecular Assemblies,
Yonsei University
, 50 Yonsei-ro Seodaemun-gu, Seoul 120-749, South Korea
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Kieron Burke
Kieron Burke
2Department of Chemistry,
University of California
, Irvine, California 92697, USA
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Min-Cheol Kim
1
Eunji Sim
1,a)
Kieron Burke
2
1Department of Chemistry and Institute of Nano-Bio Molecular Assemblies,
Yonsei University
, 50 Yonsei-ro Seodaemun-gu, Seoul 120-749, South Korea
2Department of Chemistry,
University of California
, Irvine, California 92697, USA
a)
Author to whom correspondence should be addressed. Electronic mail: [email protected]
J. Chem. Phys. 140, 18A528 (2014)
Article history
Received:
December 23 2013
Accepted:
March 06 2014
Citation
Min-Cheol Kim, Eunji Sim, Kieron Burke; Ions in solution: Density corrected density functional theory (DC-DFT). J. Chem. Phys. 14 May 2014; 140 (18): 18A528. https://doi.org/10.1063/1.4869189
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