Vibration-Rotation Bands of Some Polyatomic Molecules in the Photographic Infra-Red

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Abstract
The infra‐red absorption of methyl mercaptan, α‐methyl hydroxylamine, methyl nitrite, methyl formate, dimethyl ether, formamide, methyl fluoride, methyl chloride, methyl bromide and methyl iodide has been measured over the range 7000–12,000A using low dispersion. The intense bands have been reexamined using higher dispersion. An analysis has been made of some bands in the spectra of the methyl halides. A parallel band of methyl fluoride suggests a moment of inertia of 33.7×10—40 g cm2. The spacing between the Q branches in perpendicular type bands appears to be irregular, and other peculiarities are noticed which indicate that the simple theory may need modification.