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photochemical reaction

   Also found in: Dictionary/thesaurus, Acronyms, Wikipedia, Hutchinson 0.56 sec.

photochemical reaction

Chemical reaction initiated by absorption of energy in the form of visible (light), ultraviolet, or infrared radiation. Primary photochemical processes occur as an immediate result, and secondary processes may follow. The most important example is photosynthesis. Vision depends on photochemical reactions that occur in the eye (see retina; rhodopsin). In photographic film and paper, light activates their silver salts to a state that is easy to reduce to metallic silver grains during development. Bleaching of laundry, tanning of human skin, formation of Earth's ozone layer, and many industrial reactions are also photochemical. Certain air pollutants (see smog) become more reactive and form noxious compounds in photochemical reactions.



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Photochemical reactions in clear Arctic lakes prevent toxic methylmercury from poisoning fish and other aquatic life.
Light cleaning by Moreira, Naila / Science News
Once released into the atmosphere, reactions with species induced by sunlight and nitrogen oxides convert BD and ISO into several photochemical reaction products.
Effects of 1,3-butadiene, isoprene, and their photochemical ... by Jaspers, Ilona / Environmental Health Perspectives
As the surface erodes very slowly over time, the next few microns will then go through the same photochemical reaction.
New polymer uses sunlight to arm itself against UV damage by Naitove, Matthew H. / Plastics Technology
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