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GEOPHYSICAL RESEARCH LETTERS,
VOL. 31,
L06111,
5 PP., 2004
doi:10.1029/2003GL018793
Pressure and temperature-dependent quantum yields for the photodissociation of acetone between 279 and 327.5 nm
Department of Chemistry, University of Leeds, Leeds, UK
Department of Chemistry, University of Leeds, Leeds, UK
Department of Chemistry, University of Leeds, Leeds, UK
School of the Environment, University of Leeds, Leeds, UK
School of the Environment, University of Leeds, Leeds, UK
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.
Received 8 October 2003; accepted 16 February 2004; published 20 March 2004.
Citation: (2004), Pressure and temperature-dependent quantum yields for the photodissociation of acetone between 279 and 327.5 nm, Geophys. Res. Lett., 31, L06111, doi:10.1029/2003GL018793.
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