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Quantum topological atoms offer a new way to understand intermolecular forces. Their deformation energy accurately predicts repulsive potentials, linking quantum mechanics to classical models.

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Area of Science:

  • Quantum Chemistry
  • Computational Chemistry
  • Intermolecular Interactions

Background:

  • Topological atoms are quantum objects with defined intra-atomic energies (kinetic, Coulomb, exchange).
  • Calculating these energies from supermolecular wave functions uses parameter-free topological partitioning based on electron density.
  • Previous methods often relied on perturbation theory, but this study uses a single wave function for van der Waals complexes.

Purpose of the Study:

  • To investigate the relationship between topological atomic energies and classical interatomic potentials.
  • To analyze atomic deformation in van der Waals complexes as monomers approach.
  • To establish a link between quantum topological atomic energies and classical repulsive potentials.

Main Methods:

  • Utilized topological partitioning of electron density from a single wave function for van der Waals complexes.
  • Monitored atomic deformation (shape and volume changes) as monomers approached.
  • Analyzed atomic deformation energy using an exponential function and derived a combination rule for interatomic repulsion.

Main Results:

  • Atomic deformation energy in van der Waals complexes is accurately described by an exponential function, mirroring the Buckingham repulsive potential.
  • A combination rule was derived, expressing interatomic repulsion between different topological atoms (A and B) based on self-repulsion (A-A and B-B).
  • Successfully established a direct link between quantum topological atomic energies and classical interatomic repulsive potentials.

Conclusions:

  • Topological atomic deformation energy provides a quantum mechanical basis for classical repulsive potentials.
  • The derived combination rule simplifies the calculation of interatomic repulsion in van der Waals complexes.
  • This work bridges the gap between quantum topological descriptions and classical force field models for intermolecular interactions.