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The rate constant of self-reaction of silyl radicals, SiH3 + SiH3 → products (1), was measured at 300 K over an extended buffer gas pressure range (1−100 bar, He) using excimer laser pulsed photoly...

Oxalyl chloride, (COCl)2, has been characterized as a photolytic source of chlorine atoms for kinetic studies. UV absorption spectrum of oxalyl chloride, as well as the photodissociation yield of chlorine atoms resulting from the photodissociation of oxalyl chloride at 193 nm (ArF excimer laser) in helium as a bath gas at pHe = 1, 10, and 100 bar, were measured using laser pulsed photolysisUV−vis transient absorption spectroscopy. The photodissociation yield of chlorine atoms was determined from the measurements of photodepletion of oxalyl chloride via its absorption at 210.0 nm as well as via 270−390 nm UV absorption build-up caused by molecular chlorine formed in the recombination of chlorine atoms. The photodissosiation yield of chlorine atoms (the number of Cl atoms appeared per one dissociated oxalyl chloride molecule) is independent of helium pressure over the pressure range 1−100 bar. The photodissociation yields of chlorine atoms at 298 K were measured as 2.01 ± 0.08 and 1.97 ± 0.12 at pHe = 10 ba...