Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 8, Issue 1, Pages 35-40Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.6b02527
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Funding
- U.S. Department of Energy, Office of Basic Energy Sciences, Division of Chemical Sciences, Geosciences and Biosciences [DE-FG02-12ER16362]
- Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy [DE-AC02-05CH11231]
- Engineering and Physical Sciences Research Council (EPSRC) U.K. [EP/K039156/1, EP/J015059/1]
- EPSRC [EP/J015059/1, EP/K039156/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/K039156/1, EP/J015059/1] Funding Source: researchfish
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The VV10 and rVV10 nonlocal correlation functionals are consistently implemented and assessed, with the goal of determining if the rVV1O nonlocal correlation functional can replace the VV1O nonlocal correlation functional in the recently developed B97M-V density functional, to give the B97M-rV density functional. Along the way, four density functionals are simultaneously tested: VV1O, rVV10, B97M-V, and B97M-rV. An initial assessment is carried out across the S22 data set, and the short-range damping variable, b, is varied for all four density functionals in order to determine the sensitivity of the functionals to the empirical parameter. The results of this test indicate that a value of b = 6 (fortuitously the same as that in B97MV) is suitable for B97M-rV. The functionals are then compared across an extensive database of interaction energies, and it is demonstrated that B97M-rV either matches or outperforms B97M-V for all of the tests considered. Finally, the optimization of b across the S22 data set is extended to two range-separated hybrid density functionals, omega B97X-V and omega B97M-V, and a value of b = 6.2 is recommended for both omega B97X-rV and omega B97M-rV.
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