We [“Least-Action Tunneling Transmission Coefﬁcient for Polyatomic Reactions,” R. Meana‑Pañeda, D. G. Truhlar, and A. Fernández-Ramos, Journal of Chemical Theory and Computation 6, 6-17 (2010)] presented a new least-action variational approximation for tunneling in polyatomic reactions based on the procedure developed by Garrett and Truhlar for atom−diatom reactions. The method calculates the semiclassical ground-state tunneling probability at every tunneling energy by minimizing the value of imaginary action integral along a family of paths ranging from the minimum energy path to the straight path. The method was illustrated by applications to two hydrogen-atom abstraction reactions from methane using analytical potential energy surfaces. This work was supported by the U.S. Dept. of Energy, Office of Basic Energy Sciences.
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