Product Branching Ratios of the HCO + NO2 Reaction

Abstract

The reaction of HCO radicals with NO2 was studied at 298 K using time-resolved infrared diode laser spectroscopy to detect CO, CO2, and NO products. HCO was formed by the reaction of photolytically produced chlorine atoms with H2CO. After quantifying product yields and considering likely secondary reactions, we obtain the following product branching ratios: CO + NO + OH accounts for 63 ± 5%, and H + NO + CO2 accounts for the remaining 37 ± 5%. Upper limits of 10% are estimated for the CO + HONO and HNO + CO2 channels.