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Excited-State Vibration-Polariton Transitions and Dynamics in Nitroprusside

preprint
submitted on 20.06.2020, 02:12 and posted on 23.06.2020, 11:34 by Andrea B. Grafton, Adam D. Dunkelberger, Blake S. Simpkins, Johan F. Triana, Federico J. Hernandez, Felipe Herrera, Jeff Owrutsky

Strong cavity coupling to molecular vibrations creates vibration-polaritons capable of modifying chemical reaction kinetics, product branching ratios, and charge transfer equilibria. However, the mechanisms impacting these molecular processes remain elusive. Furthermore, even basic elements determining the spectral properties of polaritons, such as selection rules, transition moments, and lifetimes, are poorly understood. Here, we use two-dimensional infrared and filtered pump–probe spectroscopy to report clear spectroscopic signatures and relaxation dynamics of excited vibration-polaritons formed from the cavity- coupled NO band of nitroprusside. We apply a multi-level quantum Rabi model that predicts transition frequencies and strengths that agree very well with our experiment. Notably, the polariton features decay ~3-4 times slower than the polariton dephasing time, indicating that they support incoherent population, a consequence of their partial matter character. Understanding the factors determining polariton population and dephasing lifetimes will impact polariton-modified energy transfer, photophysics, and chemistry.

History

Email Address of Submitting Author

felipe.herrera.u@usach.cl

Institution

Universidad de Santiago de Chile

Country

Chile

ORCID For Submitting Author

0000-0001-8121-1931

Declaration of Conflict of Interest

No conflict of interest

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