shows characteristic asymmetry with a steeper slope in the high temperature region (T > 100 K) suggesting that the proton transfer mechanisms are different at low (T < 100 K) and high (T > 100 K) temperatures. The slopes of this plot correspond to the barrier associated with proton transfer. From the slope of the curve in the low temperature regime (T < 100 K), they obtained an activation energy of 8 meV, while that in the high temperature regime (T > 100 K) yield an activation energy of 27 meV. Similar conclusions were also derived by Meier and coworkers from their temperature dependent inelastic neutron scattering studies.