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For years, scientists have tried to determine if a transient fusing of molecular oxygen and the hydroxyl radical (·OH) plays a significant role in atmospheric chemistry. Sébastien D. Le Picard of the University of Rennes, in France, and colleagues say they have the answer: No (Science 2010, 328, 1258). Experiments and theory have both suggested that ·OH, which acts as a chemical mop to sweep up many atmospheric pollutants, could be temporarily sequestered as part of the hydrogen trioxy radical (HO·3). Picard’s group used laser-induced fluorescence to monitor reactions of ·OH in the presence of O2 over a range of temperatures. From these experiments, they were able to determine the thermodynamics of HO–O2 bond formation and dissociation. The bond between ·OH and O2, they show, is too weak to allow formation of substantive or lasting quantities of HO·3. They conclude that the fraction of ·OH bound to O2 is less than 0.1% at all altitudes in Earth’s atmosphere.
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