Abstract
THE development of automatically recording Raman spectrometers has led to increased use of Raman intensities for the quantitative analysis of liquid mixtures. A method frequently adopted is to choose a Raman line characteristic of one component and to compare its intensity in the mixture with that in the pure component. This may be done either directly or (as with the so-called scattering coefficients of Rank and co-workers1) by means of an auxiliary reference substance. The basis of the analysis is the assumption that the Raman intensity is directly proportional to the volume concentration. The purpose of this communication is to direct attention to the fact, apparently not previously taken into account, that even if the assumption were completely valid with respect to the total Raman scattering, it would not be valid for the intensities as measured with a spectrometer. The reason is that, on account of the different refractive indices of the two liquids which are compared, there will be different amounts of refraction of the scattered light as it emerges from the Raman tube; and in consequence the effective volumes of scattering liquid ‘seen’ by the spectrometer will be different.
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Fenske, M. R., Braun, W. G., Wiegand, R. V., Quiggle, D., McKormick, R. H., and Rank, D. R., Anal. Chem., 19, 700 (1947).
Nielsen, J. R., J. Opt. Soc. Amer., 20, 701 (1930).
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WOODWARD, L., GEORGE, J. Refractive Index Correction in Relative Raman Intensity Measurements. Nature 167, 193 (1951). https://doi.org/10.1038/167193a0
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DOI: https://doi.org/10.1038/167193a0
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