Improved algorithm for corner-cutting tunneling calculations

We present an improved version of the large-curvature tunneling method that more accurately treats the anharmonic potentials encountered along low-ene rgy corner-cutting tunneling paths. The method is illustrated by applicatio ns to the reaction CH3 + H-2 --> CH4 + H and to the double proton transfer in formamidine hydrate. (C) 2001 American Institute of Physics.