600 900 1200 1500 1800 , relative to the reactant well harmonic frequency, for which ⟨Piso⟩ shows maximum suppression with varying cavity coupling strength for an initial wavepacket centered at qi = -0.9 au. (c)-(e) Unscaled quantum and classical ⟨Piso⟩(η = 0.06) for the initial polariton wavepackets centered at qi = -0.9, -0.602, and -0.439 au respectively. In the various plots, the reactant well harmonic frequency ωR ≈ 1182 cm -1 and the 0 + → 1 - bright transition frequency ω10 ≈ 1039 cm -1 of the uncoupled double well system are also indicated for reference. Note that averaging time T = 1 ps with initial cavity state as in eq. 8 and in (a) the y-axis is shown on log scale.