Fourier transform measurements of SO2 absorption cross sections: II.: Temperature dependence in the 29000–44000cm−1 (227–345nm) region

Abstract: This paper is the second of a series that reports results on the measurements of the absorption cross section of SO2 in the UV/visible region at high resolution and that investigates high temperatures in support to planetary applications. Absorption cross sections of SO2 have been obtained in the 29000–44000cm−1 spectral range (227–345nm) with a Fourier transform spectrometer at a resolution of 2cm−1 (0.4500cm MOPD and boxcar apodisation). Pure SO2 samples were used and measurements were performed at room temperature (298K) as well as at 318, 338 and 358K. Temperature effects in this spectral region are investigated and are favorably compared to existing studies in the literature. Comparison of the absorption cross section at room temperature shows good agreement in intensity with most of the literature data, but shows that most of the latter suffer from inaccurate wavelength scale definition. Moreover, literature data are often given only on restricted spectral intervals. Combined with the data described in the first part of this series of papers on SO2, this new data set offers the considerable advantage of covering the large spectral interval extending from 24000 to 44000cm−1 (227–420nm), at the four temperatures investigated. [Copyright &y& Elsevier]