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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Published in | Chemical physics letters Vol. 454; no. 4; pp. 184 - 189 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
Elsevier B.V
20.03.2008
|
Online Access | Get full text |
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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. |
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ISSN: | 0009-2614 1873-4448 |
DOI: | 10.1016/j.cplett.2008.02.020 |