Kawther Ben Mabrouk, Thomas H. Kauffmann, Hassen Aroui and Marc D. Fontana Raman study of cation effect on sulfate vibration modes in solid state and in aqueous solutions Journal of Raman Spectroscopy 44
For sulfates in solid state, the ν1 mode was shown to be the most affected by increasing radius of the cation. This sensitivity in solid sulfates vanishes in aqueous solutions. As a consequence, this mode can be probed by Raman spectroscopy as the main signature of SO42−.
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