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Area of Science:

  • Quantum chemistry
  • Computational physics
  • Molecular modeling

Background:

  • Accurate calculation of molecular interactions is vital for understanding chemical processes.
  • Current reference methods for solving the many-electron Schrödinger equation face challenges with large, complex molecules.

Purpose of the Study:

  • To investigate discrepancies in noncovalent interaction energies predicted by diffusion quantum Monte Carlo and coupled-cluster theory.
  • To identify the primary source of these discrepancies in large molecular systems.

Main Methods:

  • Comparison of diffusion quantum Monte Carlo and coupled-cluster theory results.
  • Analysis of noncovalent interaction energies for large molecules (hundred-atom scale).

Main Results:

  • Unequivocal identification of the main source of puzzling discrepancies between the two theories.
  • Development of modifications to widely-used coupled-cluster methods.

Conclusions:

  • Modified coupled-cluster methods provide more accurate noncovalent interaction energies for large, polarizable molecules.
  • Enhanced accuracy impacts a wide range of applications relying on intermolecular interactions.