Abstract
The distortion of absorption profile due to multiple passes resulting from reflections at the windows of an optical cell is considered. A general method applicable to absorption in any spectral region is developed. In particular calculations are performed for collision induced far infrared absorption by rare gas mixtures. Such a calculation, in addition to the optical properties of the window material, needs the knowledge of the refractive index of the sample in the region of interest. It is shown that for rare gas mixtures, the translational contribution to the refractive index is negligible. The electronic contribution is obtained from the additivity of molar refractivities. The “true” absorption profile for Xe-Ar mixture is deduced from the observed profile obtained using a cell with diamond windows. This “true” profile in turn is used to obtain the expected profiles of the mixture with silicon and germanium windows. The suitability of this procedure will be demonstrated in a subsequent communication in which the results on integrated absorption for translational spectra of several rare gas mixtures will be presented.
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