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Area of Science:

  • Computational Chemistry
  • Quantum Mechanics
  • Spectroscopy

Background:

  • Polarizable embedding methods are increasingly used for electronic excited states.
  • Existing methods primarily focus on optical absorption and emission spectra.
  • Their applicability to excited-state chemical reactions remains less explored.

Purpose of the Study:

  • To assess the suitability of polarizable embedding methods for excited-state reactions.
  • To develop an improved polarizable embedding method for describing electronic crossings.

Main Methods:

  • Construction of a model system (LiFBe) featuring electronic crossing coupled to a polarizable species.
  • Evaluation of current polarizable Quantum Mechanics/Molecular Mechanics (QM/MM) methods.
  • Development of a novel dynamically weighted polarizable QM/MM method.

Main Results:

  • Current polarizable QM/MM methods show inadequacy in describing potential energy surfaces near electronic crossings.
  • The newly developed dynamically weighted polarizable QM/MM method demonstrates high accuracy.
  • The new method closely reproduces potential energy surfaces from high-level multireference configuration interaction calculations.

Conclusions:

  • Polarizable embedding methods require refinement for accurate modeling of excited-state reactions.
  • The dynamically weighted polarizable QM/MM method offers a promising advancement for studying such systems.
  • This new method achieves near-quantitative accuracy in reproducing complex potential energy surfaces.