Physics
Scientific paper
Mar 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3106111b&link_type=abstract
Geophysical Research Letters, Volume 31, Issue 6, CiteID L06111
Physics
23
Atmospheric Composition And Structure: Chemical Kinetic And Photochemical Properties, Atmospheric Composition And Structure: Constituent Sources And Sinks, Atmospheric Composition And Structure: Pollution-Urban And Regional (0305), Atmospheric Composition And Structure: Troposphere-Composition And Chemistry
Scientific paper
The photodissociation of acetone has been studied over the wavelength (λ) range 279-327.5 nm as a function of temperature (T) and pressure (p) using a spectroscopic method to monitor the acetyl (CH3CO) radical fragment. Above 310 nm the quantum yield (QY) is substantially smaller than previous measurements, and decreases with T. The QYs for production of CH3CO + CH3 and CH3 + CH3 + CO have been parameterised as a function of λ, p and T and used to calculate the altitude dependence of the photolysis frequency. In the upper troposphere (UT) the acetone photolysis lifetime is a factor of 2.5-10 longer, dependent upon latitude and season, than if the previously recommended QYs are used.
Arnold Steve R.
Blitz M. A.
Chipperfield Martyn P.
Heard Dwayne E.
Pilling Michael J.
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