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| | | #REDIRECT: [[Hydroxyl radical]] |
| #REDIRECT [[hydroxyl radical]] | |
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| == hydroxyl radical ==
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| <div class="definition"><div class="short_definition">The hydroxyl radical, OH, is responsible for the [[oxidation]] of most of the compounds that are released into, or formed in, the [[atmosphere]].</div><br/> <div class="paragraph">It is ubiquitous in the atmosphere, although its mean concentration is about 10<sup>6</sup>cm<sup>-3</sup> and the [[mixing ratio]] seldom exceeds 1 ppt (1 part in 10<sup>12</sup>). In the [[lower atmosphere]] it is formed by the reaction of excited [[oxygen]] atoms O(<sup>1</sup>D) with water or by the reaction of [[hydroperoxyl radicals]] with [[nitric oxide]]. In the [[stratosphere]] it is involved in ozone-destroying [[catalytic cycles]]. The capacity of the atmosphere to clean itself via the occurrence of oxidation reactions (oxidizing capacity) is usually related to the level of OH present.</div><br/> </div><div class="reference">Levy, H. 1972. Photochemistry of the lower troposphere. Planet. Space Sci.. 20. 919–935. </div><br/>
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