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Sign-consistent dynamical couplings between ab initio three-center wave functions.

L F Errea1, L Fernández, A Macías

  • 1Laboratorio Asociado al CIEMAT de Física, Atómica y Molecular en Plasmas de Fusión, Departamento de Química, Universidad Autónoma de Madrid, 28049 Madrid, Spain.

The Journal of Chemical Physics
|July 21, 2004
PubMed
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We developed a new method for consistent dynamical couplings in quantum chemistry calculations. This approach helps to accurately model avoided crossings and conical intersections in molecular systems.

Area of Science:

  • Quantum Chemistry
  • Computational Physics
  • Molecular Dynamics

Background:

  • Dynamical couplings are essential for describing transitions between electronic states in molecules.
  • Ab initio three-center wave functions are computationally intensive and prone to sign inconsistencies.
  • Accurate modeling of avoided crossings and conical intersections is crucial for understanding chemical reactions and spectroscopy.

Purpose of the Study:

  • To present a novel method for ensuring sign consistency in dynamical couplings derived from ab initio three-center wave functions.
  • To develop a systematic procedure for diabatizing avoided crossings, including conical intersections.
  • To illustrate the application of the method to specific quasimolecular systems.

Main Methods:

  • The proposed method enforces sign consistency on dynamical couplings.

Related Experiment Videos

  • A diabatization procedure is introduced to handle avoided crossings and conical intersections.
  • The method is applied to calculations for H(3)(+), LiH(2)(+), and NH(2)(5+) quasimolecules.

    • Main Results:

    • The method successfully ensures sign consistency of dynamical couplings.
    • Systematic diabatization of avoided crossings and conical intersections is achieved.
    • Demonstrated applicability to light and heavier quasimolecular systems.

    Conclusions:

    • The presented method provides a robust way to handle dynamical couplings in ab initio calculations.
    • This approach improves the accuracy of modeling non-adiabatic processes in molecular systems.
    • The technique is valuable for theoretical studies of chemical dynamics and spectroscopy.