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FEL simulated rate coefficients (symbols) fitted to the same effective two-state model (solid curves) as the experimental data. The FEL calculation included (η-1) or excluded (η0) the solvent viscosity dependence of the rate prefactor, and the activation free energies strictly obeyed the same Hammond’s principle as the U, I, and N state free energies (red free energy slope in Fig. 5) or had an added quadratic free energy term G(2).
