A Spectrometer for the Far Infrared and the Spectrum of 1,2 Dichloroethane

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Abstract
A brief description is given of a grating spectrometer which has been used in the wavelength range 22 to 77 microns. Test measurements of the pure rotation spectrum of water vapor gave excellent agreement with other investigators. The spectrum of 1,2 dichloroethane shows bands at 409, approximately 265, and 222 cm−1. A band with its center a little less than 135 cm−1 also is indicated. The value 223 cm−1 suggested for the antisymmetric skeletal deformation frequency of the trans form of dichloroethane by Mizushima, Morino, and Simanouti is thus confirmed. Their suggestion was based on a very weak Raman band which they attributed to this infrared active frequency on the basis of a breakdown of selection rules in the liquid. Our result also confirms various statistical‐thermodynamic calculations for this substance.

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