Pressure and temperature-dependent quantum yields for the photodissociation of acetone between 279 and 327.5 nm
Article first published online: 20 MAR 2004
Copyright 2004 by the American Geophysical Union.
Geophysical Research Letters
Volume 31, Issue 6, March 2004
How to Cite
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., , , , and (
- Issue published online: 20 MAR 2004
- Article first published online: 20 MAR 2004
- Manuscript Accepted: 16 FEB 2004
- Manuscript Revised: 11 NOV 2003
- Manuscript Received: 8 OCT 2003
 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.