Figure 28.

Effective potential energy profiles for the proton motion in the Georgievskii–Stuchebrukhov model of EPT. The marked regions are as follows: DW = donor well. In this region, the BO approximation is used and the electronically adiabatic potential for proton motion is approximated as harmonic. DB = donor barrier. This represents the classically forbidden region on the left side of the PES crossing point (i.e., x_c in the notation of the reported figure) where the top of the barrier is located. AB = acceptor barrier. AW = acceptor well. Reprinted with permission from ref (195). Copyright 2000 American Institute of Physics.