Pressure Modulation of Infrared Absorption* I Entire Vibration-Rotation Bands

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Abstract
The effects of pressure modulation on the total absorption ∫ A (v)dv of rotation-vibration bands of carbon monoxide, nitrous oxide, methane, and propane have been investigated. Although the ultimate limitations of pressure modulation as a detection technique have not yet been completely established, the present results are in qualitative agreement with predictions based on the earlier studies of Howard, Burch, and Williams. Modulation is of use in distinguishing weak absorption bands from background absorption in the atmosphere. In strong absorption bands, the wings are enhanced in the modulated spectrum; in weak bands, the modulated spectrum approximates that obtained by conventional methods. Possible applications of pressure modulation are suggested.

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