Photolysis of Methyl Vinyl Ketone at 193.3 nm: Quantum Yield Determinations of Methyl and Vinyl Radicals

Article abstract of DOI:10.1021/j100110a007

The primary dissociation processes in the photolysis of methyl vinyl ketone (MVK) at 193.3 nm have been investigated.A quantum yield of close to unity for the formation of both CH3 and C2H3 radicals has been determined using real-time absorption data in conjunction with gas chromatographic analysis of final products.Detailed kinetic modeling of the system indicates a rate constant of (1.5 +/- 0.3) x 10^-10 cm³ molecule^-1 s^-1 for the cross-combination of methyl with vinyl radicals.A combination/disproportionation ratio for the vinyl-vinyl system of 3.2 +/- 0.7 was obtained.The ultraviolet absorption spectrum and absorption cross-sections of methyl vinyl ketone over the wavelength range from 160 to 200 nm were measured.