Abstract

It is sometimes desireable to study the Raman spectra of materials dissolved in aqueous hydrofluoric acid or in solutions which produce hydrogen fluoride during the course of chemical reactions. The hydrolysis of complex fluoride anions is one example. Generally, Raman cells of quartz or of borosilicate glass are available but tend to be rapidly etched by HF solutions with the result that the quality of spectra tend to deteriorate as well. On the other hand, plastic cells, resistant to hydrofluoric acid, can be used provided one is willing to accept the presence of plastic Raman lines which accompany and often overlap Raman lines of interest. This is a useful expedient at best. Another material that is sometimes used as a cell material, single crystal sapphire, suffers on the basis of high cost. Part of the cost arises from the necessity of aligning one of the crystallographic axis with the axis of the cell. Such a cell is ideal for high temperature experiments, however.

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