Absorption cross section determination of biogenic C 5-aldehydes in the actinic region

Absorption cross sections for C 5-aldehydes were determined in the actinic region. Photolysis rate coefficients were estimated along the troposphere. UV absorption cross sections ( σ λ ) for 3-methylbutanal, trans-2-methyl-2-butenal, and 3-methyl-2-butenal have been determined between 255 and 390 nm...

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Bibliographic Details
Published inChemical physics letters Vol. 454; no. 4; pp. 184 - 189
Main Authors Lanza, Beatriz, Jiménez, Elena, Ballesteros, Bernabé, Albaladejo, José
Format Journal Article
LanguageEnglish
Published Elsevier B.V 20.03.2008
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Summary:Absorption cross sections for C 5-aldehydes were determined in the actinic region. Photolysis rate coefficients were estimated along the troposphere. UV absorption cross sections ( σ λ ) for 3-methylbutanal, trans-2-methyl-2-butenal, and 3-methyl-2-butenal have been determined between 255 and 390 nm and as a function of temperature (273–305 K). A D 2 lamp and a 0.5 m spectrograph coupled to a charged-couple device were employed in these measurements. σ λ values were found to be independent of temperature in the range studied. The cross section data reported in this Letter were used to provide estimates of the photolysis rate coefficients ( J i ) for these compounds as a function of altitude in the troposphere. Photolysis and OH reaction both appear to be important in determining the atmospheric fate of these compounds.
ISSN:0009-2614
1873-4448
DOI:10.1016/j.cplett.2008.02.020