Parabolic barrier crossover temperature

The expressions presented above are restricted since we used the parabolic barrier transmission probabilities. Extension of the theory to temperatures below the crossover temperature may be foimd in Ref 136. More sophisticated quantum rate theories will be discussed in Section V. 

Figure 2.6. Arrhenius plot of the dissipative tunneling rate in a cubic potential with V0 = 5h and V0. (From Grabert et al. [1987].)...

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