Abstract

Considerable theory exists bearing upon the relationship between the maxima of the envelop of the double branched series of absorption bands in the near infrared for such diatomic gases as the hydrogen halides and the temperature at which absorption takes place. An attempt has been made to compare experiment and theory particularly that of Kemble,1 and Reiche.2 We have determined the absorption of hydrogen chloride in the region 3.5 μ at two temperatures 200°K and 291°K. The agreement of experiment with theory is good at 291°K, but at 200°K there is a slight departure.

© 1923 Optical Society of America

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