Abstract
Acetyl and benzoyl radicals were formed by photolyzing acetone, acetylacetone and acetophenone. The radical decays were observed in real time using a photoionization mass spectrometer. Acetylacetone photolysis appeared to form only acetyl + acetonyl radicals rather than acetoacetyl + methyl radicals. The photolysis of acetophenone formed both benzoyl + methyl radicals and acetyl + phenyl radicals, with the former split appearing to dominate. The rate constant for the reaction of acetyl radicals with O 2 was determined to be (2.0 ± 0.4) × 10 −12 cm 3 molecule −1 s −1. The reaction betweem benzoyl and O 2 was faster, with a rate constant of (5.7 ± 1.4) × 10 −12 cm 3 molecule −1 s −1. Both these reactions appeared to be at or near their high pressure limits. Similar measurements were made for acetyl and benzoyl radicals reacting with NO.
Published Version
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