Reaction of phenylperoxy radicals with NO2 at 298 K
Abstract
In the present work, phenylperoxy radicals were generated by stationary 254 nm photolysis of iodobenzene and nitrosobenzene in the presence of O2 and NO2 at 298 K and a total pressure of 1 bar (M = N2). Experiments were performed on time scales of seconds or minutes in a temperature controlled photoreactor made of quartz (v = 209 L). Major gas phase products identified and quantified in situ by long-path IR absorption include N2O5, NO, HONO, HNO3, CO, and o-nitrophenol. In addition, evidence is presented for the formation of an aerosol consisting of p-nitrophenol. The occurrence of N2O5 as a major product in both reaction systems, the strong loss of NO2 in the iodobenzene system and the comparison of measured product distributions with the results of numerical model calculations suggest that the reaction