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Area of Science:

  • Chemical Physics
  • Spectroscopy
  • Photochemistry

Background:

  • Ultrafast photophysics involves rapid formation of excited molecular states.
  • Vibrational relaxation (cooling) of these states occurs over picoseconds.
  • Existing models struggle to explain spectral changes during hot ground state cooling (HGSC).

Purpose of the Study:

  • To develop a novel framework for modeling HGSC in time-resolved infrared (TR-IR) spectroscopy.
  • To accurately describe the frequency shifts and band reshaping of hot ground state transients.
  • To provide a versatile model applicable to various isomerizing molecules.

Main Methods:

  • Development of a simple anharmonic cascade framework.
  • Incorporation of a single adjustable parameter for vibrational energy transfer probability.
  • Utilizing ab initio data for anharmonic vibrational structure.
  • Employing nonadiabatic molecular dynamics trajectories for S1→ S0 internal conversion.

Main Results:

  • The anharmonic cascade model successfully describes HGSC band shape evolution in TR-IR spectroscopy.
  • The model was validated using experimental data from the cyan fluorescent protein chromophore.
  • Demonstrated the ability to capture spectral dynamics beyond static spectral function assumptions.

Conclusions:

  • The anharmonic cascade framework offers a robust method for analyzing HGSC.
  • The model can be extended to include mode-specific energy transfer rates.
  • This approach is applicable to any ultrafast isomerizing molecule with computable anharmonic vibrational properties.