The near-infrared absorption of liquid water at temperatures between 27 and 209°C

The spectral absorption coefficients of liquid water have been measured between 2200 and 3000 cm^(-1) and between 3700 and 7600 cm^(-1) at temperatures of 27, 89, 159, and 209°C. The integrated intensities for the entire spectral regions extending from 4600 to 5900 cm^(-1) and from 5900 to 7600 cm^(-1) have also been determined at each of the specified temperatures. Following Buijs and Choppin, the experimental data have been used, in a highly simplified analysis, for the determination of hydrogen bonding in liquid water on the assumption that water consists of clusters containing only zero, one or two hydrogen bonds per molecule. We have also indicated briefly a more complete analysis of the experimental measurements in which the full range of results on spectral absorption coefficients as a continuous function of frequency is properly utilized.