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Volume 6
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10.3390/i6010157
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Open AccessArticle

Ab initio post-HF CCSD(T) Calculations for Triplet and Singlet Methylene in Four consecutive Dunning Basis Sets with Extrapolations to Infinite Limits for Various Molecular Properties

by
Alexander Neugebauer
1 and
Günter Häfelinger
2,*
1
Saarland University, Pharmaceutical and Medicinal Chemistry, Im Stadtwald, Building 32, D-66123 Saarbruecken, Germany
2
University of Tuebingen, Institute of Organic Chemistry, Auf der Morgenstelle 18, D-72076, Tuebingen, Germany
*
Author to whom correspondence should be addressed.
Int. J. Mol. Sci. 2005, 6(1), 157-176; https://doi.org/10.3390/i6010157
Received: 8 October 2004 / Revised: 10 December 2004 / Accepted: 10 December 2004 / Published: 31 January 2005
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Abstract

Stationary points for four geometrically different states of methylene: bent and linear triplet methylene, bent and linear singlet methylene were investigated using the highly reliable post-HF CCSD(T) method. Extrapolations to the CCSD(T) basis set (CBS) limit from Dunning triple to quintuple correlation consistent polarized basis sets were performed for total energies, for the equilibrium CH distances re(CH), for singlettriplet separation energies, for energy barriers to linearity and for correlation energies. Post-HF calculations with Dunning basis sets of the literature are presented for comparisons. View Full-Text
Keywords: Ab initio CCSD(T) calculations; Extrapolations to Dunning basis set limits of infinity; Geometry of stationary points for lowest triplet and singlet states of methylene; Total energies; singlet-triplet separation energies; barriers to linearity and correlation energies Ab initio CCSD(T) calculations; Extrapolations to Dunning basis set limits of infinity; Geometry of stationary points for lowest triplet and singlet states of methylene; Total energies; singlet-triplet separation energies; barriers to linearity and correlation energies
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MDPI and ACS Style

Neugebauer, A.; Häfelinger, G. Ab initio post-HF CCSD(T) Calculations for Triplet and Singlet Methylene in Four consecutive Dunning Basis Sets with Extrapolations to Infinite Limits for Various Molecular Properties. Int. J. Mol. Sci. 2005, 6, 157-176. https://doi.org/10.3390/i6010157

AMA Style

Neugebauer A, Häfelinger G. Ab initio post-HF CCSD(T) Calculations for Triplet and Singlet Methylene in Four consecutive Dunning Basis Sets with Extrapolations to Infinite Limits for Various Molecular Properties. International Journal of Molecular Sciences. 2005; 6(1):157-176. https://doi.org/10.3390/i6010157

Chicago/Turabian Style

Neugebauer, Alexander; Häfelinger, Günter. 2005. "Ab initio post-HF CCSD(T) Calculations for Triplet and Singlet Methylene in Four consecutive Dunning Basis Sets with Extrapolations to Infinite Limits for Various Molecular Properties" Int. J. Mol. Sci. 6, no. 1: 157-176. https://doi.org/10.3390/i6010157

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