Abstract
The results of new measurements of the far-infrared optical constants of liquid water out to 4 cm −1 at 293 K are presented. These, together with previously published submillimetre wavelength measurements, are analysed to show that it is possible to fit the continuous far-infrared-to-microwave absorption spectrum to classical polar-molecule relaxation theory with added contributions from Gaussian oscillators close to 200 and 50 cm −1. Both of these oscillators have been observed in Raman studies. The 200 cm −1 band is well characterised in infrared measurements, but the present work represents the first unambiguous identification of the 50 cm −1 band in infrared observations.
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