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  A study of the photolysis and OH-initiated oxidation of acrolein and trans-crotonaldehyde

Magneron, I., Thévenet, R., Mellouki, A., Le Bras, G., Moortgat, G. K., & Wirtz, K. (2002). A study of the photolysis and OH-initiated oxidation of acrolein and trans-crotonaldehyde. Journal of Physical Chemistry A, 106(11), 2526-2537.

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Genre: Zeitschriftenartikel
Alternativer Titel : J. Phys. Chem. A

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 Urheber:
Magneron, I., Autor
Thévenet, R., Autor
Mellouki, A., Autor
Le Bras, G., Autor
Moortgat, G. K.1, Autor           
Wirtz, K., Autor
Affiliations:
1Atmospheric Chemistry, Max Planck Institute for Chemistry, Max Planck Society, ou_1826285              

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 Zusammenfassung: Experiments have been conducted in the laboratory and in the outdoor smog chamber (EUPHORE) to study the photolysis and the OH-initiated oxidation of (1) acrolein (CH2=CHCHO) and (2) traps-crotonaldehyde (CH3CH=CHCHO). In addition, the UV-visible absorption spectra for these two unsaturated aldehydes have been determined at (298 2) K, and the rate constants for OH reactions have been measured using PLP-LIF technique as function of pressure (20-300) Torr in the temperature range (243-372) K. The obtained rate constant values are k(1) = (6.55 +/- 1.22) . 10(-12) exp[(333 +/- 54)/T] and k(2) = (5.77 +/- 1.14) . 10(-12) exp[(533 +/- 58)/T] cm(3) molecule(-1) s(-1). From both midday photolysis rates J(1) less than or equal to 2 . 10(-6) s(-1) for acrolein and J(2) less than or equal to 1.2 . 10(-5) s(-1) for traps-crotonaldehyde, measured at EUPHORE during summer, and UV-visible absorption cross sections, very low effective quantum yields were derived: Phi(eff) less than or equal to 0.005 for acrolein, and Phieff less than or equal to (0.030 +/- 0.006) for traps-crotonaldehyde. The major primary products of the OH-initiated oxidation were glyoxal and glycolaldehyde for acrolein and glyoxal and acetaldehyde for tracts-crotonaldehyde. The obtained results indicate that at least 20% of the reaction of OH with acrolein proceeds by addition to the double bond. The atmospheric implications of the data are discussed. The major loss process is reaction with OH for the two aldehydes. Their atmospheric lifetimes are of few hours, and their impact mainly at a local scale will be the net HOx (OH, HO2) production through their photooxidation and that of the shorter chain carbonyl compounds produced.

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Sprache(n): eng - English
 Datum: 2002-03-21
 Publikationsstatus: Erschienen
 Seiten: -
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: Expertenbegutachtung
 Identifikatoren: eDoc: 14645
ISI: 000174551200019
 Art des Abschluß: -

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Titel: Journal of Physical Chemistry A
  Alternativer Titel : J. Phys. Chem. A
Genre der Quelle: Zeitschrift
 Urheber:
Affiliations:
Ort, Verlag, Ausgabe: -
Seiten: - Band / Heft: 106 (11) Artikelnummer: - Start- / Endseite: 2526 - 2537 Identifikator: ISSN: 1089-5639