Two-photon dissociation of SO 2 in the ultraviolet region

Abstract

Two-photon photodissociation of SO 2 through the B 1B 1 state at 286–309 nm has been studied by a perfect focusing mass spectroscopy and a photofragment imaging technique. Sulfur atoms were detected as photofragments by a resonance-enhanced multiphoton ionization technique. The lower limits of the anisotropy parameters for angular distributions are 0.42 ± 0.06 for S( 1D) and 0.50 ± 0.05 for S( 3P). The velocity distributions of the S( 1D and 3P) photofragments are analyzed assuming dissociation pathways: SO 2 + 2 ħω→S( 1D and 3P) + O 2(a 1Δ and X 3Σ − g). The two-photon excite the 8 eV region is assigned to be B 1B 1 with C 2v symmetry.