Photodissociation, photolysis, or photodecomposition is a chemical reaction in which a chemical compound is broken down by photons. It is defined as the interaction of one or more photons with one target molecule. Photodissociation is not limited to visible light. Any photon with sufficient energy can affect the chemical bonds of a chemical compou...
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http://en.wikipedia.org/wiki/Photodissociation
(from the article `comet`) ...the kinetics of fast ion-molecular reactions would prevail. The reactions might reshuffle the original molecules present in the nucleus into new ... ...the Earth gradually changed the properties of its atmosphere, producing a gaseous mixture rich in carbon dioxide (CO2), carbon monoxide (CO), and ... ......
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http://www.britannica.com/eb/a-z/p/60
The breakup of molecules through exposure to light. It occurs, for example, at the edges of a cloud of cool molecular gas when illuminated by ultraviolet radiation from nearby hot stars.
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http://www.daviddarling.info/encyclopedia/P/photodissociation.html
The splitting of a molecule by photon normally from the Sun.
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http://www.physicalgeography.net/physgeoglos/p.html
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