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A thermochemically competitive local hybrid functional without gradient corrections.

Hilke Bahmann1, Alexander Rodenberg, Alexei V Arbuznikov

  • 1Institut für Anorganische Chemie, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany.

The Journal of Chemical Physics
|January 11, 2007
PubMed
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A new local hybrid-density functional (Lh-SVWN) was developed, mixing local and exact exchange with local correlation. This functional achieves atomization energies competitive with state-of-the-art methods without using generalized gradient approximations.

Area of Science:

  • Quantum Chemistry
  • Computational Materials Science
  • Density Functional Theory

Background:

  • Local hybrid functionals offer a promising avenue for improving electronic structure calculations.
  • Existing methods often rely on generalized gradient approximations, which can limit accuracy.
  • Position-dependent exact-exchange admixture provides a tunable parameter for functional design.

Purpose of the Study:

  • To construct and evaluate a novel local hybrid functional (Lh-SVWN).
  • To assess the performance of Lh-SVWN for predicting atomization energies.
  • To determine if high accuracy can be achieved without generalized gradient approximations.

Main Methods:

  • Development of a functional mixing only local exchange, exact exchange, and local correlation.

Related Experiment Videos

  • Implementation of a simple local mixing function for position dependence.
  • Testing the functional on the G2-1 benchmark set for atomization energies.

    • Main Results:

    • The Lh-SVWN functional demonstrates competitive atomization energies on the G2-1 set.
    • Performance is comparable to established functionals like B3LYP.
    • Accuracy is achieved without employing generalized gradient approximations for exchange or correlation.

    Conclusions:

    • The developed Lh-SVWN functional is a viable and accurate alternative for electronic structure calculations.
    • It offers a simpler approach to achieving high accuracy in predicting molecular properties.
    • This work highlights the potential of local hybrid functionals in computational chemistry.