Further Discussion of Nontunneling Kinetic Isotope Effects

4 Further Discussion of Nontunneling Kinetic Isotope Effects 

We have already repeatedly emphasized several important fundamental distinctions between the adiabatic PT and the standard view. Despite these distinct differences in physical perspective between adiabatic PT and the standard Westheimer-Melander (W-M) picture, we have emphasized [4] that a remarkable general similarity exists between the two perspectives. For adiabatic PT, the symmetric reac- 

The adiabatic PT maximum KIE in Fig. 10.10(a) is in the range of KIEs commonly expected in the standard W-M picture, item (iii), but it is somewhat smaller than the higher KIEs 5-10 that one would expect with the standard view. (The argument for this latter range is given in Refs. [12-14]. ) From Eqs. (10.16) and (10.17), the maximum H/D KIE is that of the symmetric reaction 

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