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A coupled cluster study of the classical barrier height of the F+H2-->FH+H reaction

J. Chem. Phys. 95, 7426 (1991); doi:10.1063/1.461369

Issue Date: 15 November 1991

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Gustavo E. Scuseria
Department of Chemistry and Rice Quantum Institute, Rice University, Houston, Texas 77251-1892
Basis sets as large as F[7s7p5d4f2g]/H[6s5p4d2f] have been used in connection with the coupled cluster method including all single, double, and perturbative triple excitations [CCSD(T)] to predict the classical barrier height of the F+H2-->FH+H reaction. Employing transition state geometries optimized at the seven- and nine-electron CCSD(T) level with a [5s5p3d2f1g/4s3p2d1f] basis set, the calculated nine-electron barrier of 2.05 kcal/mol exhibits a 0.20 kcal/mol correlation contribution from the fluorine 2s electrons. Comparison with full configuration interaction (FCI) calculations in smaller basis sets for the electron affinity (EA) of fluorine, the energy of FH at stretched bond lengths, and the barrier height itself, demonstrate that the CCSD(T) method is capable of accurately reproducing the exact benchmark results. Employing large atomic natural orbital basis sets and correlating the F 2s electrons, the CCSD(T) predictions for the electron affinity (EA) of F (3.36 eV), the spectroscopic constants of FH (re=0.917 Å, omegae=4146 cm−1, and De=140.9 kcal/mol), and the exothermicity of F+H2-->FH+H (31.6 kcal/mol), are in excellent agreement with the experimental values of 3.40 eV, 0.917 Å, 4138 cm−1, and 141.2 and 31.7 kcal/mol, respectively. The present CCSD(T) results are also in good agreement with previous seven-electron [5s5p3d2f1g/4s3p2d] predictions for the barrier height and exothermicity obtained at the multireference configuration interaction level of theory including the Davidson correction (MRCI+Q). They are also consistent with the seven- and nine-electron MRCI results, but do not support the +Q correction when the F 2s electrons are correlated. The largest CCSD(T) calculation in this work employs 209 basis functions in C2v symmetry and indirectly accounts for more than twenty-nine million connected triple excitations. The Journal of Chemical Physics is copyrighted by The American Institute of Physics.
History: Received 25 March 1991; accepted 2 August 1991
Permalink: http://link.aip.org/link/?JCPSA6/95/7426/1
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KEYWORDS and PACS

Keywords
PACS
  • 82.30.Hk
    Physical chemistry Specific chemical reactions; reaction mechanisms Chemical exchanges (substitution, atom transfer, abstraction, disproportionation, and group exchange)
  • 31.20.-d
    Electronic structure of atoms and molecules: theory Specific calculations and results
  • 82.20.Db
    Physical chemistry Chemical kinetics Statistical theories (including transition state)
  • YEAR: 1990-91

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0021-9606 (print)   1089-7690 (online)
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