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A Practical Diabatisation Scheme for Use with the Direct-Dynamics Variational Multi-Configuration Gaussian Method.

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  • 1School of Chemistry, University of Birmingham , Edgbaston, Birmingham B15 2TT, U.K.

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A new propagation diabatisation method enables on-the-fly calculation of quantum nuclear dynamics across multiple electronic states. This approach improves computational efficiency for complex chemical reaction simulations.

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Area of Science:

  • Quantum chemistry
  • Theoretical chemistry
  • Chemical dynamics

Background:

  • Calculating quantum nuclear dynamics requires accurate treatment of multiple electronic states.
  • Existing methods for diabatisation can be computationally intensive or limited in scope.

Purpose of the Study:

  • To present a novel on-the-fly method for diabatising multiple electronic states within direct dynamics variational multi-configuration Gaussian calculations.
  • To enable efficient and accurate computation of quantum nuclear dynamics.

Main Methods:

  • The propagation diabatisation method utilizes the differential equation governing the adiabatic-diabatic transformation matrix.
  • It tracks the transformation matrix along the nuclear wave function's path (Gaussian basis functions).
  • Nonadiabatic vector coupling terms are used to update the transformation matrix.

Main Results:

  • The propagation diabatisation scheme was implemented and tested on the butatriene cation system.
  • Results were compared against a regularisation diabatisation scheme and full nuclear dynamics calculations.
  • The new method demonstrated feasibility and provided comparable results.

Conclusions:

  • Propagation diabatisation offers an efficient approach for calculating quantum nuclear dynamics involving multiple electronic states.
  • This method enhances the capabilities of direct dynamics simulations.
  • It provides a valuable tool for studying complex chemical processes.