Abstract
Recent studies have shown that the reaction between acetyl radicals and O 2 at low pressures leads to the direct fast formation of OH radical, but the nature of co-products is controversial. Laser photolysis coupled to TDLAS (10–200 Torr, 298 K) has been employed to directly monitor two possible co-products of this reaction, CO and formaldehyde. Only CH 2O has been detected in yield of 0.29 ± 0.13, but with time constants much slow than the OH formation under these conditions; the observed CH 2O-time profiles are compatible with the known mechanism of peroxyacetyl secondary reactions.
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