Accurate sets of benchmark nuclear-magnetic-resonance shielding constants and spin–rotation constants are calculated using coupled-cluster singles–doubles (CCSD) theory and coupled-cluster singles–doubles–perturbative-triples [CCSD(T)] theory, in a variety of basis sets consisting of (rotational) London atomic orbitals. The accuracy of the calculated coupled-cluster constants is established by a careful comparison with experimental data, taking into account zero-point vibrational corrections. Coupled-cluster basis-set convergence is analyzed and extrapolation techniques are employed to estimate basis-set-limit quantities, thereby establishing an accurate benchmark data set. Together with the set provided for rotational g-tensors and magnetizabilities in our previous work [O. B. Lutnæs, A. M. Teale, T. Helgaker, D. J. Tozer, K. Ruud, and J. Gauss, J. Chem. Phys. 131, 144104 (2009)], it provides a substantial source of consistently calculated high-accuracy data on second-order magnetic response properties. The utility of this benchmark data set is demonstrated by examining a wide variety of Kohn–Sham exchange–correlation functionals for the calculation of these properties. None of the existing approximate functionals provide an accuracy competitive with that provided by CCSD or CCSD(T) theory. The need for a careful consideration of vibrational effects is clearly illustrated. Finally, the pure coupled-cluster results are compared with the results of Kohn–Sham calculations constrained to give the same electronic density. Routes to future improvements are discussed in light of this comparison.
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14 January 2013
Research Article|
January 11 2013
Benchmarking density-functional theory calculations of NMR shielding constants and spin–rotation constants using accurate coupled-cluster calculations
Andrew M. Teale;
Andrew M. Teale
1Department of Chemistry, Centre for Theoretical and Computational Chemistry,
University of Oslo
, P.O. Box 1033 Blindern, N-0315 Oslo, Norway
2School of Chemistry,
University of Nottingham
, University Park, Nottingham, NG7 2RD, United Kingdom
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Ola B. Lutnæs;
Ola B. Lutnæs
1Department of Chemistry, Centre for Theoretical and Computational Chemistry,
University of Oslo
, P.O. Box 1033 Blindern, N-0315 Oslo, Norway
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Trygve Helgaker;
Trygve Helgaker
1Department of Chemistry, Centre for Theoretical and Computational Chemistry,
University of Oslo
, P.O. Box 1033 Blindern, N-0315 Oslo, Norway
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David J. Tozer;
David J. Tozer
3Department of Chemistry,
Durham University
, South Road, Durham, DH1 3LE, United Kingdom
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Jürgen Gauss
Jürgen Gauss
4Institut für Physikalische Chemie,
Universität Mainz
, D-55099 Mainz, Germany
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J. Chem. Phys. 138, 024111 (2013)
Article history
Received:
October 03 2012
Accepted:
December 06 2012
Citation
Andrew M. Teale, Ola B. Lutnæs, Trygve Helgaker, David J. Tozer, Jürgen Gauss; Benchmarking density-functional theory calculations of NMR shielding constants and spin–rotation constants using accurate coupled-cluster calculations. J. Chem. Phys. 14 January 2013; 138 (2): 024111. https://doi.org/10.1063/1.4773016
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