Similarly to Fig. , Fig. shows the TS bar- rier energy E ‡ as a function of the light-matter coupling strength A 0 for the above-mentioned critical angles for the cavity polarization vector (ϕ i , θ i ) for both isomers. The cavity frequency is ω c = 1.5 eV. It is evident that the (ϕ 1 , θ 1 ) and (ϕ 3 , θ 3 ) maximize the individual isomer TS barrier energies while the (ϕ 2 , θ 2 ) and (ϕ 4 , θ 4 ) minimize this energy for all values of coupling strength A 0 . In turn, we can inspect the ground state difference density isosurfaces for these critical points, as shown in Fig. .