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Related Experiment Videos

Assessing DFT-D3 Damping Functions Across Widely Used Density Functionals: Can We Do Better?

Jonathon Witte, Narbe Mardirossian, Jeffrey B Neaton1

  • 1Kavli Energy Nanosciences Institute at Berkeley, Berkeley, California 94720, United States.

Journal of Chemical Theory and Computation
|April 11, 2017
PubMed
Summary

This study introduces an optimized power (DFT-D3(op)) dispersion correction to enhance density functional theory (DFT) calculations. The new method significantly reduces errors in noncovalent interaction energies and molecular geometries.

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Area of Science:

  • Computational Chemistry
  • Quantum Chemistry
  • Materials Science

Background:

  • Density Functional Theory (DFT) is a powerful tool for electronic structure calculations.
  • Empirical dispersion corrections like DFT-D3 are crucial for accurately describing noncovalent interactions.
  • Existing DFT-D3 damping functions have limitations in capturing dispersion tail behavior.

Purpose of the Study:

  • To generalize the DFT-D3 damping function by introducing an adjustable exponent.
  • To improve the accuracy of DFT calculations for noncovalent interactions and isomerization energies.
  • To evaluate the performance of the new DFT-D3(op) method across various density functional approximations.

Main Methods:

  • Optimization of an additional parameter (exponent) in the DFT-D3 damping function, termed DFT-D3(op).

Related Experiment Videos

  • Parametrization of DFT-D3(op) for ten popular density functional approximations.
  • Extensive evaluation using a large test set of 2475 noncovalent binding and isomerization energies.

    • Main Results:

    • The DFT-D3(op) method demonstrates substantial improvements over existing damping functions.
    • Significant reductions in errors for noncovalent interaction energies and molecular geometries were observed.
    • Specific methods like revPBE0-D3(op) and MS2-D3(op) showed competitive performance.

    Conclusions:

    • The generalized DFT-D3(op) damping function offers enhanced accuracy for DFT calculations.
    • DFT-D3(op) provides a valuable improvement for studying systems dominated by noncovalent interactions.
    • The developed methods are competitive with state-of-the-art density functionals for accuracy in noncovalent interactions.