UV absorption spectrum of CH3OCH2 radicals and kinetics of the reaction of CH3OCH2O2 radicals with NO and NO2 in the gas phase

Alkyl and alkylperoxy radicals originating from dimethyl ether have been studied in the gas phase at 296 K. A pulse radiolysis-UV absorption technique was used. Absorption cross-sections were quantified over the wavelength range 220–350 nm. At 230 nm, σCH3OCH2 = (4.2 ± 0.5) × 10−18 cm2 molecule−1 has been obtained. Rate constants for the reaction of the alkylperoxy radical with NO and NO2 were determined to be (9.1 ± 1.0) × 10−12 cm3 molecule−1 s−1 and (7.9 ± 0.4) × 10−12 cm3 molecule−1 s−1, respectively.