Sulfur dioxide is still the subject of numerous spectroscopic studies since it plays an active role in the chemistry of Earth’s atmosphere and it is a molecule of proven astrophysical importance. In the present work we have determined the self-broadening and integrated absorption coefficients for several lines in the ν1 band spectral region around 9.2μm. Besides the parameters of the lines belonging to the ν1 fundamental of S32O2, also those for some rovibrational lines of the ν1+ν2ν2 hot band of the S32O2 isotopologue and the ν1 band of the S34O2 isotopic species have been determined. The measurements have been carried out at 297 K using a tunable diode laser spectrometer. The self-broadening parameters have also been theoretically determined employing a semiclassical formalism based on the Anderson–Tsao–Curnutte approximation. The study has been completed with the determination of the vibrational cross sections of the three fundamental bands measured from the spectra recorded at a resolution of 0.2cm1 using a Fourier transform infrared spectrometer.

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