Study of sulfur-containing molecules in the EUV region. II. Photoabsorption cross section of COS

Abstract

Using synchrotron radiation as a continuum background, the absorption cross sections of COS have been measured using a double ion chamber. The cross sections range from 7 to 50 Mb in the 175–760 Å region. The window resonance series VII (and VII′) and IX (and IX′) are tentatively assigned as nsσ and npπ converging to the C̃ 2Σ+ ion state of COS+. A dip at about 846 Å, which possibly corresponds to the n = 3 member of the VII series, is found in the high resolution photoionization curves previously published [Eland and Berkowitz, J. Chem. Phys. 70, 5155 (1979); Ono et al., J. Chem. Phys. 74, 1645 (1981), and Delwiche et al., J. Chem. Phys. 74, 4219 (1981)]. Broad structures observed in the 580–650 Å region may be Rydberg series converging to the highly excited ion states which are yet to be resolved and analyzed.