SCHEDULED MAINTENANCE
Kinetic, mechanistic and temperature dependence study of Cl reactions with CH3OC(O)H and CH3CH2OC(O)H. Atmospheric implications
Abstract
Reactions of Cl atoms with CH3OC(O)H (1) and CH3CH2OC(O)H (2) have been studied using the Discharge Flow-Mass Spectrometric (DF-MS) method. The study has been carried out at 1 Torr total pressure under pseudo-first-order conditions in the temperature range 253 K to 333 K to approach the tropospheric temperature profile. The measured room temperature rate coefficients are k(1) = (1.01 ± 0.15) × 10−12 cm3 molecule−1 s−1 and k(2) = (8.78 ± 1.22) × 10−12 cm3 molecule−1 s−1 (errors are 2σ) and the fitted Arrhenius expressions, k(1) = (1.7 ± 1.4) × 10−11 exp −(810 ± 250)/T cm3 molecule−1 s−1 and k(2) = (5.5 ± 4.8) × 10−11 exp −(556 ± 268)/T cm3 molecule−1 s−1 (errors are 2σ). The reactions proceed through the abstraction of an H atom to form HCl and the corresponding radical. At 298 K and 1 Torr, yields on HCl of 0.95 ± 0.09 (error is 2σ) for reaction (1) and 0.96 ± 0.11 (error is 2σ) for reaction (2) have been measured. The tropospheric lifetimes are calculated and discussed.
Please wait while we load your content...
