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  A highly accurate ab initio potential energy surface for methane

Owens, A., Yurchenko, S. N., Yachmenev, A., Tennyson, J., & Thiel, W. (2016). A highly accurate ab initio potential energy surface for methane. The Journal of Chemical Physics, 145(10), 104305/1-104305/13. doi:10.1063/1.4962261.

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 Creators:
Owens, Alec1, 2, Author              
Yurchenko, Sergei N.2, Author
Yachmenev, Andrey2, Author
Tennyson, Jonathan2, Author
Thiel, Walter1, Author              
Affiliations:
1Research Department Thiel, Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_1445590              
2Department of Physics and Astronomy, University College London, Gower Street, WC1E6BT London, United Kingdom, ou_persistent22              

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 Abstract: A new nine-dimensional potential energy surface (PES) for methane has been generated using state-of-the-art ab initio theory. The PES is based on explicitly correlated coupled cluster calculations with extrapolation to the complete basis set limit and incorporates a range of higher-level additive energy corrections. These include core-valence electron correlation, higher-order coupled cluster terms beyond perturbative triples, scalar relativistic effects, and the diagonal Born-Oppenheimer correction. Sub-wavenumber accuracy is achieved for the majority of experimentally known vibrational energy levels with the four fundamentals of 12CH4 reproduced with a root-mean-square error of 0.70 cm−1. The computed ab initio equilibrium C–H bond length is in excellent agreement with previous values despite pure rotational energies displaying minor systematic errors as J (rotational excitation) increases. It is shown that these errors can be significantly reduced by adjusting the equilibrium geometry. The PES represents the most accurate ab initio surface to date and will serve as a good starting point for empirical refinement.

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Language(s): eng - English
 Dates: 2016-06-122016-06-242016-08-242016-09-092016-09-14
 Publication Status: Published in print
 Pages: 13
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1063/1.4962261
 Degree: -

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Title: The Journal of Chemical Physics
  Other : J. Chem. Phys.
Source Genre: Journal
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Publ. Info: Woodbury, N.Y. : American Institute of Physics
Pages: - Volume / Issue: 145 (10) Sequence Number: - Start / End Page: 104305/1 - 104305/13 Identifier: ISSN: 0021-9606
CoNE: https://pure.mpg.de/cone/journals/resource/954922836226