Benchmarking PBE+D3 and SCAN+rVV10 methods using potential energy surfaces generated with MP2+ ΔCCSD(T) calculation
Jie Chen(陈劼)1,2, Weiyu Xie(谢炜宇)3, Kaihang Li(李开航)1, Shengbai Zhang(张绳百)4, Yi-Yang Sun(孙宜阳)2
1 Department of Physics, Xiamen University, Xiamen 361005, China; 2 State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 201899, China; 3 Institute of Chemical Materials, China Academy of Engineering Physics, Mianyang 621999, China; 4 Department of Physics, Applied Physics, and Astronomy, Rensselaer Polytechnic Institute, Troy, New York 12180, USA
Abstract We develop a benchmark system for van der Waals interactions obtained with MP2+ΔCCSD(T) method at complete basis set limit. With this benchmark, we examine the widely used PBE+D3 method and recently developed SCAN+rVV10 method for density functional theory calculations. Our benchmark is based on two molecules:glycine (or Gly, an amino acid) and uracil (or U, an RNA base). We consider six dimer configurations of the two monomers and their potential energy surfaces as a function of relative distance and rotation angle. The Gly-Gly, Gly-U, and U-U pairs represent London dispersion, hydrogen bonding, and π-π stacking interactions, respectively. Our results show that both PBE+D3 and SCAN+rVV10 methods can yield accuracy better than 1 kcal/mol, except for the cases when the distance between the two monomers is significantly smaller than the equilibrium distance. In such a case, neither of these methods can yield uniformly accurate results for all the configurations. In addition, it is found that the SCAN and SCAN+rVV10 methods can reproduce some subtle features in a rotational potential energy curve, while the PBE, PBE+D3, and the local density approximation fail.
(Electron correlation calculations for polyatomic molecules)
Corresponding Authors:
Yi-Yang Sun
E-mail: yysun@mail.sic.ac.cn
Cite this article:
Jie Chen(陈劼), Weiyu Xie(谢炜宇), Kaihang Li(李开航), Shengbai Zhang(张绳百), Yi-Yang Sun(孙宜阳) Benchmarking PBE+D3 and SCAN+rVV10 methods using potential energy surfaces generated with MP2+ ΔCCSD(T) calculation 2020 Chin. Phys. B 29 013102
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