The Absorption Spectrum of Methyl Alcohol Vapor in the Photographic Infrared

Abstract
The absorption of methyl alcohol vapor in the photographic infrared has been explored under low dispersion. Absorption regions were found at λ9500 and λ7300, which correspond to two harmonics of the O–H vibration, and at λ12,000 which is a harmonic of the C–H vibration. The two O–H harmonic bands were investigated under high dispersion and a somewhat complex rotational structure was resolved. The complete interpretation of the spectrum must be postponed until the theory of the torsion oscillator rotator is further developed.