Sonia Coriani¹, Domenico Marchesan¹,Jürgen Gauss², Christof Hättig³, Trygve Helgaker⁴, Poul Jørgensen^5
1 Dipartimento di Scienze Chimiche, Università degli Studi di Trieste, via Licio Giorgieri 1, I-34127 Trieste, Italy
² Institut für Physikalische Chemie, Universität Mainz, D-55099 Mainz, Germany
³ Forschungszentrum Karlsruhe, Institute of Nanotechnology, P.O. Box 3640, D-76021 Karlsruhe, Germany
⁴ Department of Chemistry, University of Oslo, P. O. Box 1033 Blindern, N-0315 Oslo, Norway
⁵ Department of Chemistry, University of Århus, Langelandsgade 140, DK-8000 Århus C, Denmark

J. Chem. Phys. 123, 184107 (2005).
(Received 1 August 2005; accepted 9 September 2005; published online 9 November 2005)

The performance of the standard hierarchy of ab initio models-that is, Hartree-Fock theory, second-order Moller-Plesset theory, coupled-cluster singles-and-doubles theory, and coupled-cluster singles-doubles-approximate-triples theory-in combination with correlation-consistent basis sets is investigated for equilibrium geometries of molecules containing second-row elements. From an analysis on a collection of 31 molecules (yielding statistical samples of 41 bond distances and 13 bond angles), the statistical errors (mean deviation, mean absolute deviation, standard deviation, and maximum absolute deviation) are established at each level of theory. The importance of core correlation is examined by comparing calculations in the frozen-core approximation with calculations where all electrons are correlated. (c) 2005 American Institute of Physics.

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