Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 3, Issue 22, Pages 3241-3248Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jz301015p
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- U.S. Dept. of Energy, Office of Basic Energy Sciences, Division of Chemical Sciences, Biosciences, and Geosciences [DE-SC0008550]
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An efficient, monomer-based electronic structure method is introduced for computing noncovalent interactions in molecular and ionic clusters. It builds upon our explicit polarization plus symmetry-adapted perturbation theory approach, XPol+SAPT (XPS), but replaces the problematic and expensive sum-over-states dispersion terms with empirical potentials. This modification reduces the scaling from O(N-5) to O(N-3) with respect to monomer size and also facilitates the use of Kohn-Sham density functional theory (KS-DFT) as a low-cost means to capture intramolecular electron correlation. The accuracy of the resulting method [XPS(KS)+D], in conjunction with a double-zeta basis set, is superior to MP2-type methods extrapolated to the basis-set limit, with a mean unsigned error of 0.27 kcal/mol for the S66 data set. XPS(KS)+D yields accurate potential energy curves for a variety of challenging systems. As compared to traditional DFT-SAPT methods, it removes the limitation to dimers and extends SAPT-based methodology to many-body systems.
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