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The oxidation of CO by OH(R1)is considered to be the second most important reaction in combustion chemistry.Water molecule(H2O)is an efficient third body(M)to stabilize the HOCO complex and strongly affects the properties of the HOCO radical through the formation of H2O-HOCO complex.To find a proper method for direct dynamics simulation,the MP2 and DFT(M06-2X and ωB97XD functionals)with different basis sets(6-311G**,aug-cc-pVDZ,aug-cc-pVTZ)are used to determine the stationary points of the OH+CO reaction.