Electromagnetic impulse response of triply-distilled water

The electromagnetic impulse response of the full Rocard-Powles-Lorentz model for the frequency dispersion of the dielectric permittivity of triply-distilled water with two relaxation times and four resonance lines, displays the complete Sommerfeld precursor field structure followed by a Brillouin precursor field structure whose oscillatory relaxation is quenched. Each of the predominant features observed in this propagated field is completely explained by the four resonance Lorentz model with the single exception of the long-time exponential relaxation observed for the full model. It is quite surprising that the effects of rotational polarization, which dominate the observed frequency dispersion, have only a minor effect on the propagated field.