Abstract
The Zwanzig-Mori theory is applied to the study of dielectric behavior of polar liquids in the far-infrared spectral range. The basic dynamical variables on which the calculation is based are the macroscopic dipole moment $\stackrel{\ensuremath{\rightarrow}}{\mathrm{M}}(t)$ of the liquid sample and its time derivatives. The return to transparency and the excess absorption are analyzed in detail. It is shown that the spectral behavior of pure liquids can be described by the same formulas as those applicable to analyze diluted solutions provided microscopic time parameters of the latter theories are replaced by new macroscopic time parameters chosen in an appropriate way.
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