KMID : 1059520190630010024
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Journal of the Korean Chemical Society 2019 Volume.63 No. 1 p.24 ~ p.28
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Understanding DFT Calculations of Weak Interactions: Density-Corrected Density Functional Theory
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Park Han-Sol
Kim Ye-Il Sim Eun-Ji
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Abstract
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In this work, we discuss where the failure of Kohn-Sham Density Functional Theory (DFT) occurs in weak interactions. We have adopted density-corrected density functional calculations and dispersion correction separately to find out whether the failure is due to density-driven error or functional error. The results of Benzene¡¤Ar complex, one of the most common examples of van der Waals interactions, show that DFT calculations of van der Waals interaction suffer from functional error, rather than density-driven error. In addition, errors in DFT calculations of the S22 dataset, which contains small to relatively large (30 atoms) complexes with non-covalent interactions, are governed by functional errors.
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KEYWORD
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Density functional theory, Error in semilocal density functionals, Non-covalent binding energy
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