Infrared Radiation Properties of Sulfur Dioxide

The low resolution measurements of infrared absorption are presented for ν₁, ν₃, 2ν₁, and ν₁ + ν₃ bands of sulfur dioxide. These measurements were performed at room temperature and at the optical pathlengths such that the data cover the transition and strong absorption regions. The spectral data were correlated in terms of the line-strength and the line-shape parameters by use of the Elsasser model while the Edwards exponential wide-band model was employed to correlate the total band absorptance data. The total emissivity was then calculated from these total band absorptance correlations to compare with Hottel’s result. It is found that Hottel’s result is much higher than the present calculations. Possible causes for such a large discrepancy in Hottel’s result are discussed.