The paper of Herbst and Yamashita invokes tunnelling corrections in an attempt to bring it into agreement with the experiment. I would question whether the theoretically determined barrier heights are sufficiently reliable. The basic Moller-Plesset perturbation method used in these calculations may not be suitable for studying bond-breaking processes, as the underlying zeroth-order wavefunction is unable to describe these processes. The error in the computed barrier height is expected to be of the same order of magnitude as the computed barrier.'
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