Elementary reactions of formyl (HCO) radical studied by laser photolysis-transient absorption spectroscopy

Document Type

Conference Proceeding

Publication Date

1-1-2004

Abstract

Several elementary reactions of formyl radical of combustion importance were studied using pulsed laser photolysis coupled to transient UV-visible absorption spectroscopy: HCO → H + CO (1), HCO + HCO → products (2) HCO + CH3 → products (3). Reaction 1 was studied over the buffer gas (He) 0.8-100 bar and 498-769 K. Reactions 2 and 3, as well as the UV absorption spectrum of HCO, were studied at 298 and 588 K, and the buffer gas (He) pressure l bar. Pulsed laser photolysis of acetaldehyde, propionaldehyde, and acetone, was used to prepare mixtures of free radicals. The experimental data indicate pressure dependence of the rate constant of dissociation of formyl radical 1, which was attributed to the early pressure fall-off expected based on the theory of isolated resonances. The maximum absorption cross-section of HCO is 7.3 × 10-18 sq cm/molecule at 230 nm (temperature independent within the experimental error).

Identifier

10344236011 (Scopus)

Publication Title

International Symposium on Combustion Abstracts of Accepted Papers

First Page

63

Last Page

64

Grant

31640-AC6

Fund Ref

American Chemical Society

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