Symmetry‐adapted perturbation theory has been applied to compute the intermolecular potential energy surface of the He–C2H2 complex. The interaction energy is found to be dominated by the first‐order exchange contribution and the dispersion energy. In both contributions it was necessary to include high‐level intramolecular correlation effects. Our potential has a global minimum of εm=−22.292 cm−1 near the linear He–HCCH geometry at Rm=8.20 bohr and ϑm=14.16°, and a local minimum at a skew geometry (Rm=7.39 bohr, ϑm=48.82°, and εm=−21.983 cm−1). The computed potential energy surface has been analytically fitted and used in converged variational calculations to generate bound rovibrational states of the He–C2H2 molecule and the near‐infrared spectrum, which corresponds to the simultaneous excitation of the vibration and hindered rotation of the C2H2 monomer within the complex. The nature of the bound states and of the spectrum predicted from the ab initio potential are discussed.
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1 June 1995
Research Article|
June 01 1995
Ab initio potential energy surface and near‐infrared spectrum of the He–C2H2 complex
Robert Moszynski;
Robert Moszynski
Institute of Theoretical Chemistry, Nijmegen—SON Research Center, University of Nijmegen, Toernooiveld 1, 6525 ED Nijmegen, The Netherlands
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Paul E. S. Wormer;
Paul E. S. Wormer
Institute of Theoretical Chemistry, Nijmegen—SON Research Center, University of Nijmegen, Toernooiveld 1, 6525 ED Nijmegen, The Netherlands
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Ad van der Avoird
Ad van der Avoird
Institute of Theoretical Chemistry, Nijmegen—SON Research Center, University of Nijmegen, Toernooiveld 1, 6525 ED Nijmegen, The Netherlands
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J. Chem. Phys. 102, 8385–8397 (1995)
Article history
Received:
January 09 1995
Accepted:
February 28 1995
Citation
Robert Moszynski, Paul E. S. Wormer, Ad van der Avoird; Ab initio potential energy surface and near‐infrared spectrum of the He–C2H2 complex. J. Chem. Phys. 1 June 1995; 102 (21): 8385–8397. https://doi.org/10.1063/1.468830
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