V. Daele et G. Poulet, KINETICS AND PRODUCTS OF THE REACTIONS OF CH3O2 WITH CL AND CLO, Journal de chimie physique et de physico-chimie biologique, 93(6), 1996, pp. 1081-1099
The mechanisms of the reactions CH3O2 + Cl --> products (1) and CH3O2
+ ClO --> products (2) have been studied at 298 K using a discharge no
w reactor coupled to laser induced fluorescence for the detection of C
H3O, observed as a product of both reactions, and mass spectrometry fo
r the detection of other species. In the kinetic study of reaction (1)
, the channel producing the Criegee radical, CH2O2, has been found to
be preponderant compared to the CH3O forming channel : CH3O2 + Cl -->
CH3O + ClO (1a), k(1a) = (2.0 +/- 0.4) x 10(-11) cm(3) molecule(-1) s(
-1) and CH3O2 + Cl --> CH2O2 + HCl (1b), k(1b) = (2.0 +/- 0.4) x 10(-1
0) cm(3) molecule(-1) s(-1). The study of reaction (2) aimed at identi
fying the reaction pathways : CH3O2 + ClO --> CH3O + ClOO (2a) and CH3
O2 + ClO --> CH3OCl + O-2 (2b). The branching ratio for the first chan
nel has been determined : alpha(2a) = 0.3 + 0.1. These results are com
pared with other recent literature data and their atmospheric implicat
ion is briefly discussed.