Lennard-Jones potential plus a variable quantity of the Axilrod-Teller
triple-dipole term[38,39] with units
.
The pre-multiplication factor for
the three-body term, , is specified by the *PARAMS* keyword.
If a multiplier of 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**.

David Wales
2018-02-19