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UV absorption cross-sections of a series of dimethylbenzaldehydes.

Abstract : The ultraviolet absorption cross-sections of 2,4-, 2,5-, 2,6-, 3,4- and 3,5- dimethylbenzaldehydes are reported in the wavelength range 240-320 nm. The measurements were carried out in the temperature range 318-363 K using two different experimental systems (D 2 lamp-monochromator and D 2 lamp-diode array). The absorption spectra of the five aldehydes have been found to exhibit relatively high absorption cross-sections in the region of the tropospheric interest with maxima around 290 nm. This work provides the first UV cross-section measurements for these aromatic aldehydes. The obtained cross-section values enable us to estimate the tropospheric photolysis lifetimes of these compounds. The results suggest that photolysis could be an important removal process for these species in the troposphere.
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Submitted on : Monday, February 20, 2012 - 9:55:35 AM
Last modification on : Thursday, October 14, 2021 - 1:10:03 PM

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Gisèle El Dib, Abdelkhaleq Chakir, Abdelwahid Mellouki. UV absorption cross-sections of a series of dimethylbenzaldehydes.. Journal of Physical Chemistry A, American Chemical Society, 2008, 112 (37), pp.8731-6. ⟨10.1021/jp803874e⟩. ⟨hal-00671953⟩



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