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Absolute rate constants for F + CH3CHO and CH3CO + O2, relative rate study of CH3CO + NO, and the product distribution of the F + CH3CHO reaction

✍ Scribed by Jens Sehested; Lene K. Christensen; Ole J. Nielsen; Timothy J. Wallington

Publisher: John Wiley and Sons
Year: 1998
Tongue: English
Weight: 204 KB
Volume: 30
Category: Article
ISSN: 0538-8066
DOI: 10.1002/(sici)1097-4601(1998)30:12<913::aid-kin6>3.0.co;2-5

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✦ Synopsis

Using a pulse-radiolysis transient UV-VIS absorption system, rate constants for the reactions of F atoms with CH 3 CHO (1) and CH 3 CO radicals with O 2 (2) and NO (3) at 295 K and 1000 mbar total pressure of SF 6 was determined to be

By monitoring the for-Ϫ12 Ϫ11 3 Ϫ1 Ϫ1 (4.4 Ϯ 0.7) ϫ 10 , and k ϭ (2.4 Ϯ 0.7) ϫ 10 cm molecule s . 3 mation of CH 3 C(O)O 2 radicals ( Ͼ 250nm) and NO 2 ( ϭ 400.5nm) following radiolysis of SF 6 /CH 3 CHO/O 2 and SF 6 /CH 3 CHO/O 2 /NO mixtures, respectively, it was deduced that reaction of F atoms with CH 3 CHO gives (65 Ϯ 9)% CH 3 CO and (35 Ϯ 9)% HC(O)CH 2 radicals. Finally, the data obtained here suggest that decomposition of HC(O)CH 2 O radicals via C9C bond scission occurs at a rate of

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