The performance of the standard hierarchy of ab initio models—that is, Hartree–Fock theory, second-order Møller–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

The accuracy of ab initio molecular geometries for systems containingsecond-row atoms

CORIANI, Sonia;
2005-01-01

Abstract

The performance of the standard hierarchy of ab initio models—that is, Hartree–Fock theory, second-order Møller–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
2005
http://dx.doi.org/10.1063/1.2104387
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11368/1692085
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