Abstract
The 3400 cm −1 region of the Raman spectrum of liquid water and of aqueous solutions of LiCl and LiClO 4 was investigated by analysing the isotropic and anisotropic components of the bands. Two resonances, Darling—Dennison ν 1, ν 3 and Fermi ν 1, 2ν 2, interfere with each other and the interference is different in LiCl and LiClO 4 solutions. The Fermi coupling constant W was estimated to be 97 cm −1 in pure liquid water, i.e., nearly 3 times higher than in the vapour phase, and to decrease to about 70 cm −1 in the concentrated solutions of the studied salts.
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