Photoabsorption cross-section measurements of32S, 33S, 34S, and 36S sulfur dioxide for the B1B1-X1A1 absorption band

摘要: [1] We report measurements of the ultraviolet absorption cross-sections of32SO2, 33SO2, 34SO2 and 36SO2 recorded from 250 to 320 nm at 293 K with a resolution 8 cm−1. This is first reported measurement 36SO2cross-section. work improves earlier the32SO2, 33SO2 34SO2cross-sections in good agreement concerning fine structure peak widths, localized differences maxima when isotope effects are taken into account. SO2 samples were produced an identical process via combustion isotopically enriched S0, eliminating due variation oxygen isotopic composition. Peak positions for rare isotopologues red shifted relative 32SO2 isotopologue. Starting origin shift increases linearly through band. A linear model based on spectrum 32SO2was used estimate of33,34,36SO2; average wavelength resolved absolute difference between modeled experimental spectra 77.4, 107 139 ‰ respectively. While peak-to-valley amplitude of36SO2 tends be smaller than other throughout spectrum, integrated band intensities all conserved within 4% 32SO2. The photochemical obtain fractionation constants compare chamber experiments. We conclude that planetary atmospheres will exhibit both photoexcitation photodissociation, experiments literature have imprints arising B1B1-X1A1 C1B1-X1A1 bands.