Abstract
The Raman spectra of different specimens of protium and deuterium water have been compared. The spectra have been recorded using a fiber-optic technique and a compact BWS465-785H spectrometer. The spectra of spontaneous Raman scattering have been excited using a cw laser with a wavelength of 785 nm. Significant differences in the low-frequency Raman spectra from different specimens of water have been observed, which were explained by the presence of structural changes and impurities in analyzed specimens. Stimulated Raman spectra in protium and deuterium water have been measured upon excitation by picosecond laser pulses at a wavelength of 532 nm. The presence of low-frequency satellites in the spectrum of stimulated Raman scattering, indicating the structuring of water due to the formation of clusters consisting of a few molecules, has been revealed.
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