Abstract
The rate constants for the gas-phase reactions of methyl- and ethylperoxy radicals with NO were studied at room temperature (298 ′ 2 K) and 4 Torr of pressure (He buffer) by using a laser flash photolysis coupled with time-resolved negative ionization mass spectrometry technique. The alkyl peroxy radicals were generated by the reaction of corresponding alkyl radicals with excess O 2 , where alkyl radicals were prepared by laser photolysis of several precursor molecules. The rate constants were determined to be k(CH 3 O 2 + NO) = (9.9 ′ 2.1) x 10 - 1 2 and k(C 2 H 5 O 2 + NO) = (11.0 ′ 0.8) x 10 - 1 2 cm 3 molecule - 1 s - 1 which are about a factor of 1.3 larger than the previous recommendations.
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