Raman Spectroscopy of Aqueous Electrolyte Solutions
The usefulness of Raman spectroscopy in physicochemical studies arises from two facts. First, a consideration of the occurrence of Raman lines and their depolarization ratios, in conjunction with infrared spectral studies, allows the assignment of a molecular species to a symmetry group. A possible complication in the investigation of Raman-active species in solution arises in that the selection rules for transitions may be less rigorously obeyed than they would be in situations where the molecular species is more easily defined. Second, in solution the integrated intensity of a given Raman line is, to a very good approximation, linear in the molar concentration of the species which gives rise to the line.(98,665) Most of the studies on aqueous ionic systems have exploited the latter observation. Several discussions exist on the proportionality between concentration and line intensity (6,666,672,735,874) and although the nature of the corrections necessary to bring about precise proportionality are not completely understood, appropriate adjustment of the experimental optical arrangement does, to a considerable extent, obviate the necessity for such corrections. Thus Raman spectroscopic measurements give an indication of the nature of the molecular species and in solution give a measure of its concentration.
KeywordsRaman Spectroscopy Aqueous Electrolyte Solution Ternary Solution Copyright Holder Perchlorate Concentration
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