The Elusive HO3 Radical: Kinetics of formation, thermochemistry and atmospheric role

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• Prof. Ian Smith, Department of Chemistry, University of Cambridge
• Monday 02 November 2009, 14:15-15:15
• Unilever Lecture Theatre, Department of Chemistry.

If you have a question about this talk, please contact Dr Francis Pope.

The HO3 radical has attracted considerable attention recently from both experimentalists and theoreticians, but there remains no reliable experimental information on its enthalpy of formation (delfHo) – or, equivalently, the dissociation energy D(0) of the HO-OO bond.

I shall describe new low temperature experiments performed in a continuous flow CRESU apparatus in Rennes which yield both third-order rate constants for the reaction, OH O2 M → HO3 + M at temperatures between 55 and 80 K, and the measurement of equilibrium constants for the reaction at ca. 90 K from which values of delfHo and D(0) can be derived. D(0) is approximately half the upper bound to this quantity derived by Lester and co-workers, indicating that the formation of HO3 will have only a slight influence on the chemistry of the Earth’s atmosphere.

This talk is part of the Centre for Atmospheric Science seminars, Chemistry Dept. series.

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