Infrared Spectra of H2O and CO2 at 500°C

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Abstract
A porcelain-lined absorption cell of the Pfund type is described, in which 3 meters of gas may be heated to temperatures above 500°C. The spectra of air at atmospheric pressure containing varying amounts of H2O and CO2 have been obtained in this cell between 2.4–15μ with a prism spectrometer, and between 13–25μ with a grating spectrometer giving spectral resolution of about 2 cm−1. A number of new lines in the pure rotation spectrum and the ν2vibration of H2O, originating from levels of high energy, have been observed and classified. New CO2 bands in the regions of 11–20μ and 5μ have also been observed, originating from levels as high as 5ν2, and leading to improved values of higher-quanta levels of ν2 and vibrational constants for this molecule.

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