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Area of Science:

  • Physical Chemistry
  • Theoretical Chemistry
  • Computational Chemistry

Background:

  • Understanding the temperature dependence of decay rates from excited electronic states is crucial for predicting molecular behavior.
  • Previous studies often relied on approximations that may not fully capture complex vibrational effects.

Purpose of the Study:

  • To investigate the temperature dependence of radiative and nonradiative decay rate constants from excited electronic states.
  • To analyze the vibrational contributions, including mode-mixing and frequency changes, to temperature effects.
  • To develop and utilize a new computational code for calculating these temperature-dependent rates.

Main Methods:

  • Employed a time-dependent correlation function approach within the adiabatic representation and harmonic oscillator approximation.
  • Incorporated vibrational aspects, mode-mixing, and frequency change effects.
  • Calculated the Duschinsky matrix and shift vector in Cartesian and/or internal coordinates.

Main Results:

  • Observed contrasting temperature dependencies of rate constants when comparing the Franck-Condon approximation with beyond-Franck-Condon approaches.
  • Demonstrated the influence of vibrational mode mixing and frequency shifts on temperature effects.
  • Developed a novel computational code for intersystem crossing, internal conversion, and fluorescence rate calculations.

Conclusions:

  • The vibrational structure significantly impacts the temperature dependence of excited state decay processes.
  • The developed computational tool enables accurate prediction of temperature-dependent rates for key photophysical processes.
  • Beyond-Franck-Condon treatments are essential for accurately describing temperature effects in molecular decay dynamics.