https://wikimd.com/index.php?action=history&feed=atom&title=PhotochemistryPhotochemistry - Revision history2026-04-23T09:14:09ZRevision history for this page on the wikiMediaWiki 1.44.2https://wikimd.com/index.php?title=Photochemistry&diff=6322884&oldid=prevPrab: CSV import2025-02-18T11:25:07Z<p>CSV import</p>
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<p><b>New page</b></p><div>'''Photochemistry''' is the branch of [[Chemistry|chemistry]] concerned with the chemical effects of [[Light|light]]. Generally, this term is used to denote the events that occur in the presence of light, but it also includes the chemical reaction of light, which is known as [[Photophysics|photophysics]]. <br />
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== Overview ==<br />
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Photochemistry involves the absorption of light by atoms or molecules, leading to a series of chemical reactions. The absorbed light is usually in the visible or ultraviolet part of the [[Electromagnetic spectrum|electromagnetic spectrum]]. A molecule, or small atomic particle, will absorb a quantity of light and jump to a high energy state. The energy absorbed can result in the breaking of chemical bonds, and the creation of new bonds. This process is responsible for the production of [[Ozone|ozone]] in the Earth's [[Stratosphere|stratosphere]], and the process of [[Photosynthesis|photosynthesis]] in plants.<br />
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== Laws of Photochemistry ==<br />
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The laws of photochemistry, first outlined by [[Theodor Grotthuss|Theodor Grotthuss]] and [[Christian Johann Dietrich Ehrenberg|Christian Ehrenberg]], state that only the light absorbed by a molecule can be effective in producing a photochemical reaction and that for each photon of light absorbed by a chemical system, only one molecule is activated for a photochemical reaction.<br />
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== Applications ==<br />
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Photochemistry has many practical applications, including [[Photodynamic therapy|photodynamic therapy]], the use of light to kill cancer cells, and [[Photolithography|photolithography]], the use of light to create patterns on a semiconductor surface.<br />
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== See also ==<br />
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* [[Photobiology]]<br />
* [[Photophysics]]<br />
* [[Quantum mechanics]]<br />
* [[Spectroscopy]]<br />
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== References ==<br />
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<references /><br />
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[[Category:Chemistry]]<br />
[[Category:Physical chemistry]]<br />
[[Category:Photochemistry]]<br />
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