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

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

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

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

Chemistry and Environmental Science

Research output: Contribution to conference › Paper › peer-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 language	English (US)
Pages	63-64
Number of pages	2
State	Published - 2004
Event	30th International Symposium on Combustion, Abstracts of Symposium Papers - Chicago, IL, United States Duration: Jul 25 2004 → Jul 30 2004

Other

Other	30th International Symposium on Combustion, Abstracts of Symposium Papers
Country/Territory	United States
City	Chicago, IL
Period	7/25/04 → 7/30/04

All Science Journal Classification (ASJC) codes

General Engineering

Cite this

@conference{fcfb01a81436487ba2d7e4f69c6ce5de,

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

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).",

author = "Krasnoperov, {L. N.} and Chesnokov, {E. N.} and H. Stark and Ravishankara, {A. R.}",

year = "2004",

language = "English (US)",

pages = "63--64",

note = "30th International Symposium on Combustion, Abstracts of Symposium Papers ; Conference date: 25-07-2004 Through 30-07-2004",

}

TY - CONF

T1 - Elementary reactions of formyl (HCO) radical studied by laser photolysis-transient absorption spectroscopy

AU - Krasnoperov, L. N.

AU - Chesnokov, E. N.

AU - Stark, H.

AU - Ravishankara, A. R.

PY - 2004

Y1 - 2004

N2 - 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).

AB - 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).

UR - http://www.scopus.com/inward/record.url?scp=10344236011&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=10344236011&partnerID=8YFLogxK

M3 - Paper

AN - SCOPUS:10344236011

SP - 63

EP - 64

T2 - 30th International Symposium on Combustion, Abstracts of Symposium Papers

Y2 - 25 July 2004 through 30 July 2004

ER -

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

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