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Atom-centered electric multipole moments dynamically generated from QM/MM MD simulations.

Andrea Levy1, Andrej Antalík1, Jógvan Magnus Haugaard Olsen2

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|March 4, 2026
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Summary
This summary is machine-generated.

We introduce xDRESP, a new method for calculating atom-centered multipole moments using mixed quantum mechanics/molecular mechanics simulations. This approach accurately models electrostatic potentials and molecular properties, offering insights into chemical systems.

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Area of Science:

  • Computational Chemistry
  • Molecular Modeling
  • Quantum Mechanics

Background:

  • Atom-centered electric multipole moments are valuable for simplifying complex electrostatic problems in chemistry.
  • Defining these moments is challenging as they lack direct physical observability.
  • Existing methods often rely on fixed point-charge models, which may not capture dynamic electronic effects.

Purpose of the Study:

  • To present an extension of the dynamically generated RESP charges (D-RESP) method, named xDRESP.
  • To compute atom-centered multipoles using mixed quantum mechanics/molecular mechanics (QM/MM) molecular dynamics (MD) simulations.
  • To evaluate the performance of xDRESP against traditional fixed point-charge models.

Main Methods:

  • Implementation of the xDRESP method for calculating atom-centered multipoles.
  • Utilizing QM/MM MD simulations to generate dynamic multipole moments.
  • Comparison of xDRESP with fixed point-charge models for reproducing electrostatic potentials and molecular multipoles.

Main Results:

  • xDRESP demonstrates strong performance in reproducing electrostatic potentials and molecular multipoles.
  • The method effectively captures the role of electronic polarization in chemical systems.
  • xDRESP provides valuable, on-the-fly analysis of electron density changes during chemical reactions.

Conclusions:

  • xDRESP offers a robust method for calculating dynamic atom-centered multipole moments.
  • The approach enhances the accuracy of molecular electrostatic modeling.
  • xDRESP serves as a powerful tool for understanding electronic structure and reaction dynamics.