Determination of static dielectric constant-temperature-density surfaces of a Stockmayer fluid by perturbation theory

Second-order perturbation theory is applied to a Stockmayer fluid to obtain its static dielectric constant over a range of temperatures, densities and dipole moments. A discrepancy in the literature, associated with this calculation, is identified and explained. An explanation is also provided for the fact that the theory predicts the dielectric constant accurately for low to moderately high dipole moments, while it is very inaccurate in its prediction of angular structure.