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The accurate and efficient calculation of the rate coefficients of chemicalreactions is a key issue in the research of chemical dynamics. In this work, byapplying the dimension-free ultra-stable Cayley propagator, the thermal ratecoefficients of a prototypic high dimensional chemical reaction OH + CH4 -> H2O+ CH3 in the temperature range of 200 K to 1500 K are investigated with ringpolymer molecular dynamics (RPMD), on a highly accurate full-dimensionalpotential energy surface. Kinetic isotope effects (KIEs) for threeisotopologues of the title reaction are also studied. The results demonstrateexcellent agreement with experimental data, even in the deep tunneling region.Especially, the Cayley propagator shows high calculation efficiency with littleloss of accuracy. The present results confirmed the applicability of the RPMDmethod, particularly the speed-up by Cayley propagator, in theoreticalcalculations of bimolecular reaction rates.

New Stable and Fast Ring-Polymer Molecular Dynamics for Calculating Bimolecular Rate Coefficients with Example of OH + CH_4