The Low Frequency Fundamental Bands of Methyl Chloride, Methyl Bromide and Methyl Iodide

Abstract

The parallel type bands ν₅ for CH₃Cl, CH₃Br and CH₃I have been found at λ13.7, 16.4 and 18.8μ, respectively, the rotation lines of the chloride band being partially resolved. The iodide band has a particularly sharp zero branch suitable for use in calibration. Both the chloride and bromide bands are complicated by isotopic effects, the separations being 6 cm^—1 and 1 cm^—1.