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• W3105526367 abstract "We extend to strongly correlated molecular systems the recently introduced basis-set incompleteness correction based on density-functional theory (DFT) [E. Giner et al., J. Chem. Phys. 149, 194301 (2018)]. This basis-set correction relies on a mapping between wave-function calculations in a finite basis set and range-separated DFT (RSDFT) through the definition of an effective non-divergent interaction corresponding to the electron-electron Coulomb interaction projected in the finite basis set. This enables the use of RSDFT-type complementary density functionals to recover the dominant part of the short-range correlation effects missing in this finite basis set. To study both weak and strong correlation regimes, we consider the potential energy curves of the H10, N2, O2, and F2 molecules up to the dissociation limit, and we explore various approximations of complementary functionals fulfilling two key properties: spin-multiplet degeneracy (i.e., independence of the energy with respect to the spin projection Sz) and size consistency. Specifically, we investigate the dependence of the functional on different types of on-top pair densities and spin polarizations. The key result of this study is that the explicit dependence on the on-top pair density allows one to completely remove the dependence on any form of spin polarization without any significant loss of accuracy. Quantitatively, we show that the basis-set correction reaches chemical accuracy on atomization energies with triple-ζ quality basis sets for most of the systems studied here. In addition, the present basis-set incompleteness correction provides smooth potential energy curves along the whole range of internuclear distances." @default.
• W3105526367 created "2020-11-23" @default.
• W3105526367 creator A5039205389 @default.
• W3105526367 creator A5050282598 @default.
• W3105526367 creator A5054384008 @default.
• W3105526367 creator A5086592608 @default.
• W3105526367 date "2020-05-04" @default.
• W3105526367 modified "2023-10-03" @default.
• W3105526367 title "A basis-set error correction based on density-functional theory for strongly correlated molecular systems" @default.
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• W3105526367 doi "https://doi.org/10.1063/5.0002892" @default.
• W3105526367 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/32384859" @default.

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