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Fluidic Molecular Dynamics and Energy Relaxation Pathways in Solution-State Electronic Strong Coupling Using a

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Strong coupling between light and matter (SC) enables control over molecular dynamics. This study reveals new ultrafast dynamics in liquid-state molecules under electronic strong coupling (ESC), showing faster energy migration than previously observed.

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Area of Science:

  • Photochemistry
  • Physical Chemistry
  • Spectroscopy

Background:

  • Light-matter strong coupling (SC) offers control over molecular photophysical dynamics.
  • Previous studies on ultrafast dynamics under electronic strong coupling (ESC) primarily focused on solid-state molecular samples.
  • The influence of hybridized light-matter states on liquid-phase molecular dynamics remained unexplored.

Purpose of the Study:

  • To investigate the ultrafast dynamics of liquid-state molecules under electronic strong coupling (ESC) for the first time.
  • To explore the impact of hybridized light-matter states on molecular dynamics in the liquid phase.
  • To understand the role of SC in controlling photochemical processes in liquids.

Main Methods:

  • Transient absorption spectroscopy to probe ultrafast dynamics.
  • Resonant optical Kerr-effect (ROKE) spectroscopy to analyze depolarization kinetics.
  • Comparison of liquid-state ESC dynamics with and without an optical cavity.

Main Results:

  • Observation of a novel fast decay component in liquid-state ESC, absent in non-coupled systems.
  • Accelerated depolarization kinetics in liquid-state ESC, indicating faster energy migration.
  • Energy migration rates exceeding polariton lifetimes and molecular rotational constants.

Conclusions:

  • Electronic strong coupling significantly alters ultrafast molecular dynamics in the liquid phase.
  • Hybridized light-matter states facilitate rapid energy migration in liquid systems.
  • These findings provide a foundation for designing liquid-state photochemical systems utilizing SC principles.