期刊
JOURNAL OF PHYSICAL CHEMISTRY A
卷 109, 期 9, 页码 2012-2018出版社
AMER CHEMICAL SOC
DOI: 10.1021/jp045141s
关键词
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A benchmark database of forward and reverse barrier heights for 19 non-hydrooen-transfer reactions has been developed by using Weizmarm 1 calculations, and 29 DFT methods and 6 ab initio wave-function theory (WFT) methods have been tested against the new database as well as against an older database for hydrogen atom transfer reactions. Among the tested hybrid DFT methods without kinetic energy density, MPW1K is the most accurate model for calculations of barrier heights. Among the tested hybrid meta DFT methods, BB1K and MPWB1K are the two most accurate models for the calculations of barrier heights. Overall, the results show that BB1K and MPWB1K are the two best DFT methods for calculating barrier heights. followed in order by MPW1K, MPWKCIS1K, B1B95, MPW1B95, BHandHLYP, B97-2, mPW1PW91, and B98. The popular B3LYP method has a mean unsigned error four times larger than that of BB1K. Of the methods tested, QCISD(T) is the best ab initio WFT method for barrier height calculations, and QCISD is second best, but QCISD is outperformed by the BB1K, MPWB1K, MPWKCIS1K, and MPW1K methods.
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