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- W2046270983 abstract "We consider a general class of hybrid density functionals with decomposition of the exchange component into short-range and long-range parts. The admixture of Hartree-Fock (HF) exchange is controlled by three parameters: short-range mixing, long-range mixing, and range separation. We study how the variation of these parameters affects the accuracy of hybrid functionals for thermochemistry and kinetics. For the density functional component of the hybrids, we test three nonempirical approximations: local spin-density approximation, generalized gradient approximation (GGA), and meta-GGA. We find a great degree of flexibility in choosing the mixing parameters in range-separated hybrids. For the studied properties, short-range and long-range HF exchange seem to have a similar effect on the errors. One may choose to treat the long-range portion of the exchange by HF to recover the correct asymptotic behavior of the exchange potential and improve the description of density tail regions. If this asymptote is not important, as in solids, one may use screened hybrids, where long-range HF exchange is excluded. Screened hybrids retain most of the benefits of global hybrids but significantly reduce the computational cost in extended systems." @default.
- W2046270983 created "2016-06-24" @default.
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- W2046270983 date "2006-08-18" @default.
- W2046270983 modified "2023-10-10" @default.
- W2046270983 title "Importance of short-range versus long-range Hartree-Fock exchange for the performance of hybrid density functionals" @default.
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- W2046270983 doi "https://doi.org/10.1063/1.2244560" @default.
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