Dichromatic irradiation studies of C2a3Πu radical formation with TEA CO2 laser heating of C2H3Br/CF2HCl mixtures

The process of Infrared Multiphoton Dissociation (IRMPD) was studied in a mixture of vinyl bromide/chlorodifluoromethane (VBr, C 2 H 3 Br/CF 2 HCl) using single and double infrared pulsed transverse excitations atmospheric CO 2 laser beams. The dissociation of VBr was investigated using FTIR, and the product composition was analysed, and various dissociation routes were proposed. The study found that the VBr molecules were more heavily dissociated when exposed to the CF 2 HCl environment than without it. By using a time-resolved LIF, the kinetics reactions with CF 2 HCl were explored under pseudo-first-order conditions, and the quenching rate constant for the interaction between CF 2 HCl and C 2 d 3 Π g was published using the classical Stern–Volmer model. The impact of pulsed laser heating on the generation of C 2 a 3 Π u radicals was also observed. The decrease in the intensity of the C 2 ( a 3 Π u ) LIF signal was due to faster recombination of the C 2 a 3 Π u radicals, together with a decrease in V - V ′ energy transfer and the pressure oscillations produced by the effect of pulsed laser heating in the irradiated volume and the experimental conditions. Graphical abstract