Influence of Temperature on the Spectrum of Water*

The normal-incidence spectral reflectance of water at 5, 27, and 70°C has been measured in the spectral region between 5000 and 350 cm−1. From the measured values of spectral reflectance we have determined the optical constants nr and ni by Kramers–Kronig methods. The band strengths SB = ∫ni(ν) dν and bandwidths have been determined for the absorption bands near 3400, 1640, and 600 cm−1 at each temperature. A similar study of deuterium oxide at 27°C has been conducted for purposes of comparison.