Abstract
The optical rotation of quartz has been observed in the infrared from 2.2 to 9.7μ. The measurements were made with a selenium film transmission polarizer and a similar analyzer; a Perkin‐Elmer Model 12B infrared spectrometer was used as the monochromator and detector. Anomalous rotatory dispersion was found at wavelengths longer than 3.7μ. A tentative qualitative interpretation of the anomaly is suggested.
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