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One major concern with the results shown is that entropic contributions are evaluated with harmonic approximations (as implemented by default in the Gaussian program) which may lead to serious errors for contributions from low-frequency modes, specially in the ion-molecule reactant/product states. Anharmonic corrections should be computed at least in some cases. For the remaining cases, given that most of the conclusions/discussion are based on reported free energies, there should be caution or warning about the reliability of the reported \Delta S and the derived \Delta G.
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