Abstract
In the 180–200 mμ region the internal reflection technique has been used to measure easily the absorption spectra in liquid state and in concentrated solutions. A 45° Dove prism made from white sapphire has been used to achieve a single reflection. By this technique with a sapphire prism, some solvents which could not be used by the ordinary transmission technique can be used without any difficulty. Internal reflection spectra of liquid acetone, methyl isobutyl ketone and a 20% dimethyl sulphide ethanolic solution have been measured and found to be nearly equal to the spectra measured in the gaseous state.
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