Abstract
A method is presented for making far-infrared cells equipped with silicon windows which have been successfully used for quantitative measurements in the 15–450 cm−1 region. A stainless steel cell has been constructed which is vaccum-tight and of constant path length even after repeated filling and use. Its application is illustrated by low-frequency spectra of toluene as diluted solutions in cyclohexane. The concentration dependence of the intensity of the B 1(x) vibration, whose assignment has been described in previous papers by other authors, is shown. The accuracy of the quantitative evaluations by using the values of absorbance (log I 0 /I max and the integrated intensities is discussed.
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