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Ab initio study of the intermolecular potential of Ar–H2O
The Journal of Chemical Physics (1991)
  • G. Chalasinski
  • M. M. Szczesniak
  • Steve Scheiner, Utah State University

The combination of supermolecular Møller–Plesset treatment with the perturbation theory of intermolecular forces is applied in the analysis of the potential‐energy surface of Ar–H2O. The surface is very isotropic with the lowest barrier for rotation of ∼35 cm−1 above the absolute minimum. The lower bound for De is found to be 108 cm−1 and the complex reveals a very floppy structure, with Ar moving freely from the H‐bridged structure to the coplanar and almost perpendicular arrangement of the C2 –water axis and the Ar–O axis, ‘‘T‐shaped’’ structure. This motion is almost isoenergetic (energy change of less than 2 cm−1 ). The H‐bridged structure is favored by the attractive induction and dispersion anisotropies; the T‐shaped structure is favored by repulsive exchange anisotropy. The nonadditive effect in the Ar2–H2O cluster was also calculated. Implications of our results on the present models of hydrophobic interactions are also discussed.

  • Ab,
  • initio,
  • intermolecular,
  • potential,
  • Ar,
  • H2O
Publication Date
January 1, 1991
Publisher Statement

Originally published by American Institute of Physics in the Journal of Chemical Physics.

Publisher's PDF can be accessed through the remote link.

Citation Information
Ab initio study of the intermolecular potential of Ar--H[sub 2]O G. Chalasinski, M. M. Szczesniak, and S. Scheiner, J. Chem. Phys. 94, 2807 (1991), DOI:10.1063/1.459857