University of Cambridge > Talks.cam > Centre for Atmospheric Science seminars, Chemistry Dept. > The Elusive HO3 Radical: Kinetics of formation, thermochemistry and atmospheric role

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

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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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