Laser spectrometry and kinetics of selected elementary reactions of the acetonyl radical

Krisztina Imrik, Edit Farkas, Gábor Vasvári, István Szilágyi, Dariusz Sarzyński, S. Dóbé, T. Bérces, Ferenc Márta

Research output: Contribution to journalArticle

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Abstract

The laser induced fluorescence excitation spectrum (LIF) and the ultraviolet absorption spectrum (TA) of the acetonyl radical (CH 3C(O)CH2) were remeasured by using the time-resolved fast discharge flow (DF) and laser flash photolysis (LP) experimental techniques (T = 298 K). The absorption cross section of σ(acetonyl, 207 nm) = (3.16 ± 0.61) x 10-18 cm2 molecule-1 was determined calibrated against the acetyl-peroxyl radical (CH3C(O) O2) in LP/TA measurements. The kinetics of the reactions of CH 3C(O)CH2 with the open shell reaction partners O 2 (1), NO (2), NO2 (3) and H (4) were studied by using the DF method with LIF detection of the acetonyl radical at 298 ± 1 K and 2.85 ± 0.05 mbar He pressure. The rate constants for the overall reactions were determined in units of cm3 molecule-1 s-1 to be k1 = (3.49 ± 0.51) × 10 -13, k2 = (1.04 ± 0.19) × 10-11, k3 = (3.25 ± 0.65) × 10-11 and k4 ≥ 3 × 10-10 with 2σ accuracy given. The acetonyl radical was found to react similarly to alkyl radicals by comparison with literature results. A reduced reactivity was observed toward O2 and NO that might be attributed to the resonance stabilisation of the acetonyl radical. No such effect was observed for the NO2 and H atom reactions.

Original languageEnglish
Pages (from-to)3958-3968
Number of pages11
JournalPhysical Chemistry Chemical Physics
Volume6
Issue number15
DOIs
Publication statusPublished - Aug 7 2004

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Spectrometry
Photolysis
Kinetics
Lasers
kinetics
laser induced fluorescence
spectroscopy
lasers
Molecules
flash
photolysis
Absorption spectra
Rate constants
Stabilization
Fluorescence
methylidyne
Atoms
ultraviolet absorption
ultraviolet spectra
absorption cross sections

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Atomic and Molecular Physics, and Optics

Cite this

Imrik, K., Farkas, E., Vasvári, G., Szilágyi, I., Sarzyński, D., Dóbé, S., ... Márta, F. (2004). Laser spectrometry and kinetics of selected elementary reactions of the acetonyl radical. Physical Chemistry Chemical Physics, 6(15), 3958-3968. https://doi.org/10.1039/b404889j

Laser spectrometry and kinetics of selected elementary reactions of the acetonyl radical. / Imrik, Krisztina; Farkas, Edit; Vasvári, Gábor; Szilágyi, István; Sarzyński, Dariusz; Dóbé, S.; Bérces, T.; Márta, Ferenc.

In: Physical Chemistry Chemical Physics, Vol. 6, No. 15, 07.08.2004, p. 3958-3968.

Research output: Contribution to journalArticle

Imrik, Krisztina ; Farkas, Edit ; Vasvári, Gábor ; Szilágyi, István ; Sarzyński, Dariusz ; Dóbé, S. ; Bérces, T. ; Márta, Ferenc. / Laser spectrometry and kinetics of selected elementary reactions of the acetonyl radical. In: Physical Chemistry Chemical Physics. 2004 ; Vol. 6, No. 15. pp. 3958-3968.
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