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Model space diabatization for quantum photochemistry.

Shaohong L Li1, Donald G Truhlar1, Michael W Schmidt2

  • 1Department of Chemistry, Chemical Theory Center, and Supercomputing Institute, University of Minnesota, Minneapolis, Minnesota 55455, USA.

The Journal of Chemical Physics
|February 16, 2015
PubMed
Summary
This summary is machine-generated.

We introduce model space diabatization, a novel method for transforming electronic states. This approach simplifies dynamical correlation calculations in quantum chemistry, improving accuracy for complex molecular systems.

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Area of Science:

  • Quantum Chemistry
  • Theoretical Chemistry
  • Computational Chemistry

Background:

  • Diabatization is crucial for simplifying complex electronic state interactions.
  • Existing methods often face challenges with computational efficiency and accuracy.
  • Smooth potential energy surfaces and negligible non-adiabatic couplings are desired.

Purpose of the Study:

  • To propose a simple and general diabatization strategy.
  • To enhance the applicability of multi-configuration quasidegenerate perturbation theory (MC-QDPT).
  • To enable dynamical correlation calculations using standard post-MCSCF methods.

Main Methods:

  • Model space diabatization strategy.
  • Application to multi-configuration quasidegenerate perturbation theory (MC-QDPT) and its extended version (XMC-QDPT).
  • Utilizing state-averaged multi-configurational self-consistent field (MCSCF) results for diabatization.

Main Results:

  • Demonstrated the validity of the proposed diabatization strategy.
  • Successfully applied the method to LiH, LiF, and thioanisole systems.
  • Showcased the advantage of basing dynamical correlation on standard post-MCSCF methods.

Conclusions:

  • Model space diabatization offers a robust and versatile approach.
  • The method simplifies dynamical correlation calculations in quantum chemistry.
  • This strategy enhances the treatment of non-adiabatic effects in molecular systems.