Study of SO2 line parameters with a quantum cascade laser spectrometer around 1090cm-1: Comparison with calculations of the ν1 and ν1+ν2-ν2 bands of 32SO2 and the ν1 band of 34SO2

SO2 spectra have been recorded with a quantum cascade laser spectrometer at 9μm. Line positions, line strengths and self-broadening coefficients of 42 lines have been precisely determined. All these parameters have shown some discrepancies with those of the HITRAN database. Moreover several lines found in this study were not present in this database. In order to have a complete line list of transitions of SO2 appearing into the recorded spectra, we have performed a new calculation of the ν1 band of 32SO2, the ν1+ν2-ν2 band of 32SO2 and the ν1 band of 34SO2. This new calculation demonstrates a considerable improvement of the calculations of synthetic spectra of SO2. These new calculations improve the positions (up to 0.03cm-1), the intensities (up to 30%) and the self-broadening coefficients (up to 100%) of the ν1 band of 32SO2 with respect to HITRAN database and permit to obtain a complete set of data for the ν1+ν2-ν2 band of 32SO2 and the ν1 band of 34SO2 where the positions and strengths are in very good agreement with experimental data.