Absorption cross-sections for vibrationally excited fluorosulphate radicals

Abstract The absorption cross-sections of vibrationally excited FSO 3 radicals have been measured over the 340-470 nm wavelength range at 295 K. The radicals are formed following the electronic quenching of the FSO 3 (B 2 E) radicals initially generated in the photolysis of F 2 S 2 O 6 at 193 nm. Using previously obtained relaxation rate coefficients, a modelling of the double-exponential decay of the vibrationally excited FSO 3 with a consecutive first-order mechanism allows the determination of the absorption cross-sections for these species. Evidence is presented which suggests that these phenomenological cross-sections correspond to low-lying manifolds of vibrational states.