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Pressure and temperature-dependent quantum yields for the photodissociation of acetone between 279 and 327.5 nm
 

Summary: Pressure and temperature-dependent quantum yields for the
photodissociation of acetone between 279 and 327.5 nm
M. A. Blitz, D. E. Heard, and M. J. Pilling
Department of Chemistry, University of Leeds, Leeds, UK
S. R. Arnold and M. P. Chipperfield
School of the Environment, University of Leeds, Leeds, UK
Received 8 October 2003; revised 11 November 2003; accepted 16 February 2004; published 20 March 2004.
[1] The photodissociation of acetone has been studied over
the wavelength (l) range 279327.5 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 l, 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 2.510 longer,
dependent upon latitude and season, than if the previously
recommended QYs are used. INDEX TERMS: 0317

  

Source: Arnold, Steve - School of Earth and Environment, University of Leeds

 

Collections: Environmental Sciences and Ecology