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Axilrod-Teller formula


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An expression for three-body interactions in intermolecular forces. These dipole dispersion terms, called Axilrod-Teller terms (named after B. M. Axilrod and E. Teller, who discovered them in 1943) are of importance in the third virial coefficient. At low temperatures, the Axilrod-Teller terms can have a comparable size to two-body interactions, making them of importance to such properties of liquids as pressure and surface tension. The Axilrod-Teller formula for the dispersion energy V of three closed-shell atoms A, B, and C is given by V=– C6/rAB6C6/rBC6C6/rCA6+C′/(rABrBCrCA)3, where C6 is a coefficient depending on the identity of the atoms, C′ is a coefficient depending on another constant and the angles between the atoms, and the r terms give distances between the indicated atoms.

V=– C6/rAB6C6/rBC6C6/rCA6+C′/(rABrBCrCA)3

Subjects: Chemistry.


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