Abstract:
This article shows Raman spectra of water in the liquid (a) and solid (b) states. There are considerable differences between these spectra. We have made a detailed study of the alteration of the spectra when water crystallizes, using various types of excitation and measurement of the spectra. With a 180° recording geometry, the Raman spectrum of a two-phase mixture (solid and liquid) represents a superposition of the spectra of water and ice. A direct consequence of this is the conclusion that it may be possible to determine the partial volumes of the two phases in the mixture. We used a device in which the Raman spectrometer recorded radiation backscattered 180° relative to the exciting radiation at the Stokes frequencies, and a 300 mW LG-106M-1 argon laser operating at 488 nm. We obtained high-quality Raman spectra from the surface of freshly fallen snow.