The dielectric constant of polar hard dumb-bells

We present Monte Carlo simulation results for the dielectric constant of the polar hard dumb-bell fluid. The Ewald sum technique is used to take account of the long range nature of the electrostatic interactions. The results for the dielectric constant are found to be sensitive to the choice of the dielectric constant of the continuum which surrounds the simulation sample. We include comparisons with experimental results on chloromethane and the predictions of an analytically solvable approximation for the polar hard dumb-bell fluid.