The infrared absorption spectra of a large number of deuterium‐containing methane samples, and a few of ethane, have been studied with a rocksalt spectrometer. All the observable fundamental frequencies of each individual methane isotope have been identified, and from the relative intensity of absorption at various characteristic wave‐lengths the composition of any mixture of these isotopes may be determined. The infrared spectra of deuteroethanes including C2D6have been observed.
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