The recently proposed explicitly correlated approximations [T. B. Adler, G. Knizia, and H.-J. Werner, J. Chem. Phys. 127, 221106 (2007)] are applied to compute equilibrium structures and harmonic as well as anharmonic vibrational frequencies for , HCN, , , , , , , and the trans-isomer of 1,2-. Using aug-cc-pVTZ basis sets, the CCSD(T)-F12a equilibrium geometries and harmonic vibrational frequencies are in very close agreement with CCSD(T)/aug-cc-pV5Z values. The anharmonic frequencies are evaluated using vibrational self-consistent field and vibrational configuration interaction methods based on automatically generated potential energy surfaces. The mean absolute deviation of the CCSD(T)-F12a/aug-cc-pVTZ anharmonic frequencies from experimental values amounts to only .
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7 February 2009
Research Article|
February 02 2009
Accurate calculation of vibrational frequencies using explicitly correlated coupled-cluster theory Available to Purchase
Guntram Rauhut;
Guntram Rauhut
a)
Institut für Theoretische Chemie,
Universität Stuttgart
, Pfaffenwaldring 55, D-70569 Stuttgart, Germany
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Gerald Knizia;
Gerald Knizia
Institut für Theoretische Chemie,
Universität Stuttgart
, Pfaffenwaldring 55, D-70569 Stuttgart, Germany
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Hans-Joachim Werner
Hans-Joachim Werner
Institut für Theoretische Chemie,
Universität Stuttgart
, Pfaffenwaldring 55, D-70569 Stuttgart, Germany
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Guntram Rauhut
a)
Gerald Knizia
Hans-Joachim Werner
Institut für Theoretische Chemie,
Universität Stuttgart
, Pfaffenwaldring 55, D-70569 Stuttgart, Germany
a)
Author to whom correspondence should be addressed. Electronic mail: [email protected].
J. Chem. Phys. 130, 054105 (2009)
Article history
Received:
October 20 2008
Accepted:
December 22 2008
Citation
Guntram Rauhut, Gerald Knizia, Hans-Joachim Werner; Accurate calculation of vibrational frequencies using explicitly correlated coupled-cluster theory. J. Chem. Phys. 7 February 2009; 130 (5): 054105. https://doi.org/10.1063/1.3070236
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