Precision photoabsorption cross section measurements of SO₂from 147 to 1017 A

Absolute photoabsorption cross sections for sulphur dioxide have been measured in the VUV region from 147 to 1017 AA. By the use of a windowless double ion chamber, the authors have been able to achieve accuracies between +or-1 and +or-2%. The results are compared with the only two published cross section data in this wavelength region. All three measurements agree well in the short-wavelength region but differ by up to 25% at wavelengths longer than 300 AA.