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Frequency-dependent force fields for QMMM calculations.

Ignat Harczuk1, Olav Vahtras, Hans Ågren

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This study introduces frequency-dependent polarizable force fields, enabling accurate simulations of molecular dynamics and cluster polarizabilities. These novel force fields capture the impact of frequency dispersion in quantum mechanics-molecular mechanics (QMMM) simulations.

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Area of Science:

  • Computational Chemistry
  • Molecular Dynamics
  • Quantum Chemistry

Background:

  • Accurate molecular simulations require force fields that capture electronic polarization.
  • Frequency-dependent effects are crucial for understanding molecular interactions and properties in dynamic environments.

Purpose of the Study:

  • To develop and validate frequency-dependent polarizable force fields.
  • To investigate the impact of frequency dispersion in quantum mechanics-molecular mechanics (QMMM) simulations.
  • To enable classical determination of frequency-dependent cluster polarizabilities.

Main Methods:

  • Generalized LoProp algorithm for analytic response theory.
  • Decomposition of molecular dynamical polarizability into localized atomic dynamical polarizabilities.
  • Modified Silberstein-Applequist procedure for interacting inducible point-dipoles.

Main Results:

  • Successfully constructed frequency-dependent polarizable force fields.
  • Demonstrated the effect of frequency dispersion in QMMM methods for water clusters and organic residues.
  • Validated classical determination of frequency-dependent cluster polarizabilities against QM and QMMM results.

Conclusions:

  • Frequency-dependent polarizable force fields offer a significant advancement in molecular simulation accuracy.
  • The developed methodology provides a robust approach for incorporating dynamic polarization effects.
  • This work paves the way for more sophisticated and accurate computational studies of molecular systems.