In this case, the concentrations of
SO2 and CH3 were simulated using a reaction mechanism
including reaction 1 forming 2CH3 SO2, reaction 12 and
reaction 2. The wall loss processes of O atoms and CH3 radicals
were considered to be negligible compared with the fast gasphase chemistry. One can note an excellent agreement (within
10%) between the experimental concentrations of products and
those calculated with the branching ratio of unity for the SO2
2CH3 channel of reaction 1.