A New Band in the Absorption Spectrum of Methane Gas

Abstract
The absorption spectrum of methane gas has been examined in the photographic infrared region from 6500A to 9500A in the hope of observing overtones of the known fundamental frequencies. A path length of 10 meters of gas at 70 cm pressure was used. The source of continuous radiation was a tungsten filament and the radiation was analysed with a grating spectrograph having a dispersion of 2.6A per mm at 8000A.

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