Abstract
PHOTO-ELECTRIC polarimeters are not yet available commercially, although several types have been described in recent years1. Between about 4500 and 6500 A. there is no particular advantage in using such instruments, since in this region visual spectro-polarimeters are very accurate and convenient; but for longer and shorter wave-lengths, photo-electric methods are less tedious than the older photographic ones. We are interested in the red and near infra-red for the extension of studies on the Cotton effect for blue nitroso compounds2, and we set out to adapt a Unicam spectrophotometer for measuring rotatory dispersion by adding two Glazebrook prisms and a graduated circle. The arrangement has proved to be so satisfactory for our work that we feel justified in making this preliminary communication.
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References
See Weissaberger, “Physical Methods of Organic Chemistry”, 2, 967 (New York, 1946).
Mitchell, J. Chem. Soc., 3258 (1928) and subsequent papers.
Kenyon and Dickes, Nature, 117, 304 (1926).
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MITCHELL, S., VEITCH, J. Rotatory Dispersion Measurements with a Unicam Spectrophotometer. Nature 168, 662–663 (1951). https://doi.org/10.1038/168662a0
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DOI: https://doi.org/10.1038/168662a0
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