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Area of Science:

  • Chemical Physics
  • Quantum Dynamics
  • Theoretical Chemistry

Background:

  • Incorporating nuclear quantum effects into nonadiabatic dynamics is a significant challenge in theoretical chemistry.
  • Accurate modeling of quantum nuclear effects like delocalization is crucial for understanding chemical reaction dynamics.

Purpose of the Study:

  • To introduce novel nonadiabatic dynamics approaches based on constrained nuclear-electronic orbital (CNEO) theory.
  • To effectively integrate quantum nuclear delocalization effects into potential energy surfaces for dynamics simulations.

Main Methods:

  • Developed new nonadiabatic dynamics methods utilizing the constrained nuclear-electronic orbital (CNEO) theory.
  • Combined CNEO theory with Ehrenfest dynamics and surface hopping algorithms.
  • Applied the new methods to a one-dimensional proton-coupled electron transfer model.

Main Results:

  • The CNEO-based approaches effectively capture both nonadiabaticity and quantum nuclear delocalization.
  • These new methods outperform conventional Ehrenfest dynamics and surface hopping.
  • Accurate prediction of proton transfer dynamics and transmission probabilities in the low-momentum regime was achieved.

Conclusions:

  • The CNEO theory provides a robust framework for incorporating nuclear quantum effects into nonadiabatic dynamics.
  • The developed methods offer improved accuracy for simulating quantum proton transfer processes.
  • This work advances the theoretical treatment of nonadiabatic chemical reactions involving quantum nuclei.