Study of sulfur-containing molecules in the EUV region. I. Photoabsorption cross section of SO2

Abstract

Using synchrotron radiation as a continuum background, the absorption cross sections of SO2 have been measured using a double ionization chamber. The cross sections range from 10 to a maximum value of 56 Mb in the 175–760 Å region. A possible window resonance series was observed and tentatively assigned to a Ryberg series converging to the (6a1)−1 ion state. From the fluorescence excitation function the vibrational progressions of the SO+2 ? 2B2, ? 2A1, and ? 2B1 ion states have been measured and found in good agreement with those observed from photoelectron spectroscopy. The same correspondence between peaks in the fragment fluorescence excitation function and the photoelectron spectrum suggests that these ion states of SO2 are dissociative in nature.