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Localization of Odorant Receptor Genes in Locust Antennae by RNA In Situ Hybridization
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Range-separated local hybrids.

Robin Haunschild1, Gustavo E Scuseria

  • 1Department of Chemistry, Rice University, Houston, Texas 77005, USA. rh8@rice.edu

The Journal of Chemical Physics
|June 17, 2010
PubMed
Summary
This summary is machine-generated.

We developed new computational chemistry methods, screened local hybrids and long-range-corrected local hybrids, improving accuracy for chemical reactions and material properties. These methods offer better predictions for thermochemistry and reaction barriers.

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Area of Science:

  • Computational Chemistry
  • Quantum Mechanics
  • Materials Science

Background:

  • Generalized gradient approximation (GGA) exchange functionals are widely used in electronic structure calculations.
  • Local hybrid functionals offer a balance between accuracy and computational cost.
  • Previous work established a foundation for local hybrids of GGA exchange.

Purpose of the Study:

  • To introduce two novel range-separated extensions of local hybrid functionals.
  • To evaluate the performance of these new methods against established benchmarks.
  • To advance the accuracy of predicting chemical and physical properties.

Main Methods:

  • Development of screened local hybrid functionals.
  • Development of long-range-corrected (LC) local hybrid functionals.
  • Assessment of thermochemistry, reaction barrier heights, and heats of formation.

Main Results:

  • The screened local hybrid demonstrated improved performance for thermochemistry and barrier heights compared to HSE06.
  • The LC local hybrid showed enhanced accuracy for heats of formation and nonhydrogen transfer barriers over LC-omegaPBE.
  • The LC local hybrid's accuracy for hydrogen transfer barrier heights did not match LC-omegaPBE.

Conclusions:

  • Range-separated local hybrids represent a promising advancement in electronic structure theory.
  • The screened and LC local hybrids offer valuable alternatives for specific chemical and material property predictions.
  • Further refinement may be needed to achieve state-of-the-art accuracy for all types of reaction barriers.