Comment on High-Temperature Approximations for Kinetic Isotope Effects

in reasonably good agreement with their value.Moreover, Eq. (5) shows that a is the same whether the reactant is H 2CO or D 2 CO.Applied to the other isotopic variants of this reaction discussed by TRM, the method gives results in substantial agreement with theirs.The slight differences that were found probably arise from small errors in their calculation of vibrational frequencies, I have recalculated these, using their assumed force constants and molecular geometry in the Schachtschneider-Snyder program,6 and obtain vibrational frequencies slightly different from those reported by TRM.