A fast doubly hybrid density functional method close to chemical accuracy using a local opposite spin ansatz.
basic_science · Level V
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- Record sourced from PubMed, PMID 22114187.
- Also identified by DOI 10.1073/pnas.1115123108 and PMC identifier 3250148.
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Abstract
We develop and validate the XYGJ-OS functional, based on the adiabatic connection formalism and Görling-Levy perturbation theory to second order and using the opposite-spin (OS) ansatz combined with locality of electron correlation. XYGJ-OS with local implementation scales as N(3) with an overall accuracy of 1.28 kcal/mol for thermochemistry, bond dissociation energies, reaction barrier heights, and nonbonded interactions, comparable to that of 1.06 kcal/mol for the accurate coupled-cluster based G3 method (scales as N(7)) and much better than many popular density functional theory methods: B3LYP (4.98), PBE0 (4.36), and PBE (12.10).