The Absorption Spectrum of Methyl Alcohol Vapor in the Photographic Infrared

The absorption of methyl alcohol vapor in the photographic infrared has been explored under low dispersion. Absorption regions were found at lambda9500 and lambda7300, which correspond to two harmonics of the O[Single Bond]H vibration, and at lambda12,000 which is a harmonic of the C[Single Bond]H vibration. The two O[Single Bond]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.