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Convergence of third order correlation energy in atoms and molecules

✍ Scribed by Kalju Kahn; Alex A. Granovsky; Jozef Noga

Publisher: John Wiley and Sons
Year: 2006
Tongue: English
Weight: 274 KB
Volume: 28
Category: Article
ISSN: 0192-8651
DOI: 10.1002/jcc.20562

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✦ Synopsis

Abstract

We have investigated the convergence of third order correlation energy within the hierarchies of correlation consistent basis sets for helium, neon, and water, and for three stationary points of hydrogen peroxide. This analysis confirms that singlet pair energies converge much slower than triplet pair energies. In addition, singlet pair energies with (aug)‐cc‐pVDZ and (aug)‐cc‐pVTZ basis sets do not follow a converging trend and energies with three basis sets larger than aug‐cc‐pVTZ are generally required for reliable extrapolations of third order correlation energies, making so the explicitly correlated R12 calculations preferable. © 2006 Wiley Periodicals, Inc. J Comput Chem 28: 547–554, 2007

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