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arXiv 2012.09249physics.chem-ph
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r2SCAN-D4:一般化学应用的色散校正元广义梯度近似

r2SCAN-D4: Dispersion corrected meta-generalized gradient approximation for general chemical applications

Sebastian Ehlert, Uwe Huniar, Jinliang Ning, James W. Furness, Jianwei Sun, Aaron D. Kaplan, John P. Perdew, Jan Gerit Brandenburg

摘要:

我们结合了强约束和适当赋范的半局部密度泛函的正则化变体[J. Sun,A。Ruzsinszky和J.P. Perdew,Phys. Rev. Lett. 115,036402(2015)],具有最新一代半经典伦敦色散校正。所得密度泛函近似r2 SCAN-D4具有广义梯度近似的速度,同时接近一般化学应用的混合泛函的精度。我们证明了它的数值鲁棒性在现实生活中的设置和基准分子几何形状,一般的主群和有机金属热化学,以及在超分子复合物和分子晶体中的非共价相互作用。主族和过渡金属键长的误差仅为0.8%,这与主族分子的混合泛函具有竞争力,并且优于过渡金属络合物。化学性质的大型GMTKN 55数据库上的加权平均绝对偏差(WTMAD 2)非常小,为7.5 kcal/mol。这也适用于MAD为3.3 kcal/mol的金属有机反应。对有机和金属有机体系的通用适用性转移到凝聚体系,其中分子晶体的晶格能在化学精度范围内(误差<1 kcal/mol)。

英文摘要:

We combine a regularized variant of the strongly constrained and appropriately normed semilocal density functional [J. Sun, A. Ruzsinszky, and J. P. Perdew, Phys. Rev. Lett. 115, 036402 (2015)] with the latest generation semi-classical London dispersion correction. The resulting density functional approximation r2SCAN-D4 has the speed of generalized gradient approximations while approaching the accuracy of hybrid functionals for general chemical applications. We demonstrate its numerical robustness in real-life settings and benchmark molecular geometries, general main group and organo-metallic thermochemistry, as well as non-covalent interactions in supramolecular complexes and molecular crystals. Main group and transition metal bond lengths have errors of just 0.8%, which is competitive with hybrid functionals for main group molecules and outperforms them for transition metal complexes. The weighted mean absolute deviation (WTMAD2) on the large GMTKN55 database of chemical properties is exceptionally small at 7.5 kcal/mol. This also holds for metal organic reactions with an MAD of 3.3 kcal/mol. The versatile applicability to organic and metal-organic systems transfers to condensed systems, where lattice energies of molecular crystals are within chemical accuracy (errors <1 kcal/mol).

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