The first one consisted of the measurements of the
concentrations of SO2 and CH3 formed in reaction 1 as a
function of the consumed concentration of oxygen atoms.
Relatively short reaction times (typically 2.5 3 ms) and high
DMSO concentrations (5 1013 molecule cm 3) were used
in these experiments in order to minimize the influence of
secondary reactions on the detected concentrations of CH3 and
SO2.Br2 (2 1014 molecule cm 3) was added through inlet
5, so that O was detected as BrO and CH3 as CH3Br (see the
Experimental Section).