Furthermore, in Ref. 7, it was pointed out that a very small Rabi splitting observed in optical spectra can lead to much larger changes in activation free energy, such that ∆(∆G ‡ ) > Ω R , which seems to be a general trend in most VSC experiments. But this phenomenon lacks a theoretical explanation. Here, we attempt to provide one, with k ∝ η 2 c which significantly influences the rate and, correspondingly, the effective free energy barrier.