The absorption spectra of liquid phase H<SUB>2</SUB>O, HDO and D<SUB>2</SUB>O from 0.7 &#956;m to 10 &#956;m

Infrared spectra of liquid H2O, D2O, and HDO from 0.7 to 10 &#956;m have been obtained. The H2O spectrum is based on that of natural water, the D2O spectrum on that of heavy water containing approximately 99.6 weight per cent D2O. The HDO spectrum has been deduced from spectra of H2O-HDO-D2O mixtures by application of Beer's law. The spectra are presented in terms of logarithms of both an extinction length, L, the sample thickness that has unit optical density, and the molecular extinction coefficient, &#949;, plotted against logarithms of both wavelegnth and wave number. Vibration mode assignments have been made for most of the absorption bands observed. The spectral data obtained have been useful in the development of infrared monitoring instrumentation and methods of analysis for H2O-HDO-D2O mixtures in connection with the heavy water reactor research programs at the Chalk River Nuclear Laboratories