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

L. N. Krasnoperov, E. N. Chesnokov, H. Stark, A. R. Ravishankara

Research output: Contribution to conferencePaperpeer-review

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).

Original languageEnglish (US)
Pages63-64
Number of pages2
StatePublished - Jan 1 2004
Event30th International Symposium on Combustion, Abstracts of Symposium Papers - Chicago, IL, United States
Duration: Jul 25 2004Jul 30 2004

Other

Other30th International Symposium on Combustion, Abstracts of Symposium Papers
CountryUnited States
CityChicago, IL
Period7/25/047/30/04

All Science Journal Classification (ASJC) codes

  • Engineering(all)

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