A Hilger E-1 spectrograph was used to study the Raman scattering by pure water excited by the 3650A group of the mercury arc. Photometric measurements of the plates were made with a Moll microphotometer. The violet band at about 4150A appears to consist of three components. The effect on this band of various concentrations of aqueous solutions of KCl, NaOH, and KOH was examined. In all cases the energy appears to shift toward the long wave-length side and in addition the top of the curves grows sharper with increasing concentrations.
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Hatley et al. (1931) studied this question.
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