Interaction energy of coupled permanent dipoles in oriented molecules

The partition function of coupled molecular dipoles in a static electric field parallel to the supermolecular axis is evaluated by expanding the interaction energy function around the equilibrium position of minimum potential energy. The resulting expansion of the configurational integral is, as was proved by these same authors, an asymptotic representation in the limit of the strong interaction parameter a. This allows for the computation of one-sided averages of the supermolecular dipole moment not attainable through symmetrical procedures.