A new excited electronic state of SF2 radical observed by resonance-enhanced multiphoton ionization

The resonance-enhanced multilphoton ionization (REMPI) spectrum of SF2 radical has been recorded between 235 and 270 nm. A pulsed dc discharge technique was applied to generate neutral SF2 radicals. Analyses of the laser intensity index and vibrational progression indicate that the spectrum arises from one-photon resonance between the ground-state X̃ 1A1 and a previously unobserved B̃′ state. The band origin and vibrational frequency ω1″(a1, sym., str.) were determined as 38 623 and 926±4 cm−1, respectively. The B̃′ state seems to be a valence state with relatively strong predissociation for v′≥3 levels.