AX

Lennard-Jones potential plus a variable quantity of the Axilrod-Teller triple-dipole term[37,38] with units $\sigma=\epsilon=1$ . The pre-multiplication factor for the three-body term, $Z^*$ , is specified by the PARAMS keyword. If a multiplier of $0.0$ is specified the Axilrod-Teller derivatives and energy are not calculated, thus providing a route to the pure Lennard-Jones potential in reduced units. Subroutines used: ardiff, apairs, axdiff, axpairs.