Absorption cross-section measurements of the vinyl radical in the 440–460 nm region by cavity ring-down spectroscopy

Absorption cross-sections of the vinyl radical (C2H3) have been determined in the spectral range 440–460 nm, using laser photolysis coupled with a cavity ring-down spectroscopic detection technique. The disappearance rate of vinyl radical by its absorption in à 2A″–X̃ 2A′ transition was probed by visible cavity ring-down spectroscopy. Based on a reaction kinetics simulation, the absorption cross-sections of the vinyl radical were estimated.