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• W3202040776 abstract "It has been experimentally demonstrated that reaction rates for molecules embedded in microfluidic optical cavities are altered when compared to rates observed under ordinary reaction conditions. However, precise mechanisms of how strong coupling of an optical cavity mode to molecular vibrations affects the reactivity and how resonance behavior emerges are still under dispute. In the present work, we approach these mechanistic issues from the perspective of a thermal model reaction, the inversion of ammonia along the umbrella mode, in the presence of a single-cavity mode of varying frequency and coupling strength. A topological analysis of the related cavity Born-Oppenheimer potential energy surface in combination with quantum mechanical and transition state theory rate calculations reveals two quantum effects, leading to decelerated reaction rates in qualitative agreement with experiments: the stiffening of quantized modes perpendicular to the reaction path at the transition state, which reduces the number of thermally accessible reaction channels, and the broadening of the barrier region, which attenuates tunneling. We find these two effects to be very robust in a fluctuating environment, causing statistical variations of potential parameters, such as the barrier height. Furthermore, by solving the time-dependent Schrödinger equation in the vibrational strong coupling regime, we identify a resonance behavior, in qualitative agreement with experimental and earlier theoretical work. The latter manifests as reduced reaction probability when the cavity frequency ωc is tuned resonant to a molecular reactant frequency. We find this effect to be based on the dynamical localization of the vibro-polaritonic wavepacket in the reactant well." @default.
• W3202040776 created "2021-10-11" @default.
• W3202040776 creator A5026408313 @default.
• W3202040776 creator A5026898130 @default.
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• W3202040776 date "2022-04-21" @default.
• W3202040776 modified "2023-10-14" @default.
• W3202040776 title "Cavity-altered thermal isomerization rates and dynamical resonant localization in vibro-polaritonic chemistry" @default.
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• W3202040776 doi "https://doi.org/10.1063/5.0076434" @default.
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• W3202040776 hasPublicationYear "2022" @default.
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