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Area of Science:

  • Physical Chemistry
  • Chemical Physics
  • Spectroscopy

Background:

  • Spectral line shapes in liquids are broadened by interactions with the surrounding molecular environment, termed the 'bath'.
  • Classical treatment of bath degrees of freedom leads to dephasing, while quantum mechanical treatment introduces decoherence.

Purpose of the Study:

  • To investigate the relative importance of decoherence (quantum bath effects) versus dephasing in broadening spectral line shapes.
  • To explore the impact of these broadening mechanisms on absorption and emission spectra, including the Stokes shift.

Main Methods:

  • Developed general theoretical frameworks for analyzing absorption and emission line shapes considering both dephasing and decoherence.
  • Derived new relationships connecting classical and quantum treatments of bath dynamics.
  • Applied the theoretical models to a model system and a realistic system (vibrational OH stretch in HOD/D2O).

Main Results:

  • Identified new connections between classical dephasing and quantum decoherence treatments of spectral broadening.
  • For the vibrational OH stretch in HOD/D2O, quantum effects were found to be minor, except for their influence on the Stokes shift.
  • The study suggests quantum bath effects are generally less significant for many vibrational and most electronic transitions in liquids at room temperature.

Conclusions:

  • Quantum decoherence plays a limited role in spectral broadening for many common liquid-phase transitions at room temperature.
  • Dephasing remains the dominant mechanism for spectral broadening in most cases.
  • Quantum effects are more pronounced for the Stokes shift, highlighting its sensitivity to bath dynamics.