Physics – Atomic and Molecular Clusters
Scientific paper
2005-05-19
Physics
Atomic and Molecular Clusters
To be published in a special issue of Molecular Physics in honour of Mark Child
Scientific paper
10.1080/00268970500224523
The long-range forces that act between three atoms are analysed in both atom-diatom and atom-atom-atom representations. Expressions for atom-diatom dispersion coefficients are obtained in terms of 3-body nonadditive coefficients. The anisotropy of atom-diatom C_6 dispersion coefficients arises primarily from nonadditive triple-dipole and quadruple-dipole forces, while pairwise-additive forces and nonadditive triple-dipole and dipole-dipole-quadrupole forces contribute significantly to atom-diatom C_8 coefficients. The resulting expressions are applied to dispersion coefficients for Li + Li_2 (triplet) and recommendations are made for the best way to obtain global triatomic potentials that dissociate correctly both to three separated atoms and to an atom and a diatomic molecule.
Cvitas Marko T.
Hutson Jeremy M.
Soldan Pavel
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