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Nonequilibrium Environment Dynamics in a Frequency-Dependent Polarizable Embedding Model.

Andrew Wildman1, Greta Donati1, Filippo Lipparini2

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A new polarizable embedding method, ωMMPol, efficiently models frequency-dependent solvent effects on quantum systems. It reveals how solvent resonance dramatically alters molecular dynamics, impacting charge transfer in solvated systems.

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Area of Science:

  • Computational Chemistry
  • Quantum Mechanics
  • Molecular Mechanics

Background:

  • Hybrid quantum mechanical/molecular mechanical (QM/MM) models are crucial for simulating solvent effects on quantum systems.
  • Polarizable embedding (PE) methods account for electrostatic and polarization interactions between QM and MM subsystems.

Purpose of the Study:

  • Introduce ωMMPol, a novel polarizable embedding scheme using induced dipoles.
  • Describe electron dynamics and frequency-dependent solvent behavior efficiently.
  • Investigate the impact of frequency-dependent solvents on quantum system dynamics.

Main Methods:

  • Developed a polarizable embedding scheme (ωMMPol) based on induced dipoles.
  • Applied ωMMPol to study Rabi oscillations of H₂⁺ in a resonant field.
  • Analyzed charge transfer dynamics in a solvated system.

Main Results:

  • ωMMPol efficiently describes electron evolution and frequency-dependent solvent effects.
  • Off-resonant solvent frequencies cause mild perturbations.
  • Near-resonant solvent frequencies fundamentally alter H₂⁺ dynamics.

Conclusions:

  • ωMMPol effectively simulates realistic chemical systems.
  • Frequency-dependent solvent effects are critical for accurate molecular dynamics.
  • The method captures complex phenomena like charge transfer in solvated environments.