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Other atmospheric trace constituents, such as nitrous
oxide (N2O), water vapor,
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and freons, can also be photolyzed. They produce highly
reactive radicals that
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keep ozone abundances lower than they would otherwise be.
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These radicals include: nitric oxide (NO), atomic chlorine (Cl),
bromine (Br)
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radicals, and hydroxyl (OH) radicals.
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These radicals can destroy stratospheric ozone through “catalytic
cycles”.
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A catalytic cycle is a set of chemical reactions facilitated by the
presence of a
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catalyst.
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A catalyst is a substance that increases the rate of a chemical
reaction but is
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itself unchanged by the reaction.
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