The Absorption by Formaldehyde Vapor in the Infrared

Abstract
The absorption spectrum of formaldehyde vapor in the infrared has been investigated with a prism spectrometer to 7.0μ. In addition to confirming the bands reported by Salant and West at 3.5μ, 1.8μ, 1.4μ, and 1.25μ, a fifth band at 4.8μ was located. The two regions at 3.5μ and 4.8μ have been investigated under higher dispersion using an echellette grating ruled with 3600 lines per inch, and resolved into a fine structure. Polymerization of the gas into paraformaldehyde was avoided by using a cell that could be heated.

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