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Near-Basis-Set-Limit Double-Hybrid DFT Energies with Exceptionally Low Computational Costs
Dávid Mester1,2,3, Mihály Kállay1,2,3
1Department of Physical Chemistry and Materials Science, Faculty of Chemical Technology and Biotechnology, Budapest University of Technology and Economics, Műegyetem rkp. 3., H-1111 Budapest, Hungary.
Abstract:
The use of density-based basis-set correction (DBBSC) [ J. Phys. Chem. Lett. 2019, 10, 2931] is extended to double-hybrid (DH) functionals. The proposed DBBSC-DH approach significantly reduces the basis-set requirements for accurate calculations, enabling near-basis-set-limit results using affordable one-electron basis sets. The accuracy of this method is comparable to that of the recently proposed DH functionals utilizing explicitly correlated (F12) second-order perturbation theory contribution [ J. Phys. Chem. Lett. 2022, 13, 9332]; however, its computational costs and resource demands are only a fraction of those associated with the DH-F12 scheme. Applications to real-life examples reveal that only a 30% overhead in wall-clock time is observed compared to conventional DH calculations, demonstrating that the DBBSC-DH approach is a compelling alternative to the excellent but relatively costly DH-F12 functionals, particularly for extended molecular systems.
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