Collision-induced far infra-red absorption and depolarized light scattering in liquid water

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Abstract
The excess absorption observed in the far infra-red spectrum of liquid water is analysed in terms of interaction-induced dipoles. A comparison of the infra-red spectral function with the depolarized Rayleigh scattering spectrum is offered in support of this analysis. The virtual identity of the two spectra in the 50 cm-1 to 300 cm-1 frequency region is used, along with the characteristic frequency describing their exponential shape to argue for a common short-range induction mechanism as the origin of the spectra.