UV Photolysis in a C2H2F2Br2 Mixture with Oxygen

Photolysis of C2H2F2Br2 Mixture with O2 in the Oxygen Pressure Range 1–3.5 Torr

“…Earlier, to interpret the experimental data obtained by us during the photolysis of C 2 H 2 F 2 Br 2 in a mixture with oxygen at oxygen pressures exceeding 12 Torr, we proposed the following photolysis scheme of C 2 H 2 F 2 Br 2 at a wavelength of 253.7nm [1]:…”

“…We have previously shown [1] that at sufficiently high oxygen pressures the quantum yield of the photolysis of C 2 H 2 F 2 Br 2 is equal to unity; i.e., the formation of the second bromine atom in reaction (I) does not occur. In this study, we carried out photolysis at oxygen pressures in the range of 1 to 3.5 Torr on the assumption that, possibly, under these conditions, reaction (I) will compete with reaction (II).…”

“…It was determined in [1] that the ratio of constants k IV /k III is 2.6; thus, expression (1) can be represented as follows:…”

“…Earlier, in [1], we studied the photolysis of C 2 H 2 F 2 Br 2 in the pressure range from 4 to 30 Torr in a mixture with oxygen at pressures of the latter ranging from 12 to 500 Torr. Interest in this hydrocarbon containing bromine atoms is caused by the fact that it is a hydrogen-containing analog of C 2 F 4 Br 2 (halon 2402).…”

“…In contrast to [1], this study was carried out at oxygen pressures not exceeding 3.5 Torr, which made it possible to obtain additional results.…”