The probable reaction mechanism for the reaction of methyl and chlorine mon
oxide radicals has been studied using the G2MP2 method. Among the six possi
ble pathways, the present calculations show that production of methoxyl rad
ical and chlorine atom, and formaldehyde and hydrogen chloride are the two
most significant, and their reaction barriers are very close in energy. Sim
ple RRKM calculations have been performed to compare these two main channel
s in detail. On the basis of detailed comparison with the experimental resu
lts, the present theoretical results are generally considered to be good.