期刊
JOURNAL OF CHEMICAL THEORY AND COMPUTATION
卷 7, 期 12, 页码 3944-3951出版社
AMER CHEMICAL SOC
DOI: 10.1021/ct2005616
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资金
- Israel Science Foundation
- Gerhard Schmidt Minerva Center for Supra-Molecular Architecture
- Lise Meitner Center for Computational Chemistry
- historical generosity of the Perlman family
- Israel Science Foundation [1313/08]
- European Community [FP7/2007-2013, 249225]
- Center for Nanoscience and Nanotechnology at Tel Aviv University
- Alexander von Humboldt (AvH) foundation
We present a comparative assessment of the accuracy of two different approaches for evaluating dispersion interactions: interatomic pairwise corrections and semiempirical meta-generalized-gradient-approximation (meta-GGA)-based functionals. This is achieved by employing conventional (semi)local and (screened-)hybrid functionals, as well as semiempirical hybrid and nonhybrid meta-GGA functionals of the M06 family, with and without interatomic pairwise Tkatchenko Scheffler corrections. All of those are tested against the benchmark S22 set of weakly bound systems, a representative larger molecular complex (dimer of NiPc molecules), and a representative dispersively bound solid (hexagonal boron nitride). For the 522 database, we also compare our results with those obtained from the pairwise correction of Grimme (DFT-D3) and nonlocal Langreth Lundqvist furtctionals (vdW-DF1 and vdW-DF2). We find that the semiempirical kinetic-energy-density dependence introduced in the M06 functionals mimics some of the nonlocal correlation needed to describe dispersion. However, long-range contributions are still missing. Pair-wise interatomic corrections, applied to conventional semilocal or hybrid functionals, or to M06 functionals, provide for a satisfactory level of accuracy irrespectively of the underlying functional. Specifically, screened-hybrid functionals such as the.Heyd Scuseria Ernzerhof (HSE) approach reduce self-interaction errors in systems possessing both localized and delocalized orbitals and can be applied to both finite and extended systems. Therefore, they serve as a useful underlying functional for dispersion corrections.
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