The H2O–CO2 continuum around 3.1, 5.2 and 8.0 [formula omitted]m: New measurements and validation of a previously proposed [formula omitted] factor

Abstract

The H2O–CO2 continuum has been measured, at room temperature, at discrete spectral points in the 1100–1500, 1800–2000, and 3100–3300 cm−1 intervals. Our results are in good agreement with previous experimental values in the low frequency wing of the ν2 band of H2O when the associated uncertainties are taken into account. Furthermore, they confirm the quality, in this region, of a χ factor previously adjusted on measurements in the 100–1500 cm−1 range, and prove its validity in the blue side of the ν2 band as well as in the region around 3.1 μm, which have been experimentally studied for the first time in this work. Together with recent measurements in the 1.6 μm, 2.3 μm and far infrared regions, our results contribute to the progressive building-up of a data set for the modeling of the absorption by CO2+H2O mixtures throughout the infrared, which is needed for studies of CO2-rich planetary atmospheres.