Influence d'une microstructure dans l'absorption integree des liquides polaires

A relation between the second moment of the orientational correlation function: g(t) = 〈u(0)·Σu(t)〉 and the complex dielectric constant ϵ of a liquid is obtained without using dielectric theories. This relation is correct for a statistically homogeneous fluid. When the fluid shows a local structure and for molecules having axial multipoles, we correct the preceding relation taking into account the first order dependence of polarizability which is due to the dipoles induced on the microstructure by the axial multipoles. We then give the second order correction only on the dipole approximation.