In chemistry, photocatalysis is the acceleration of a photoreaction in the presence of a catalyst. In catalysed photolysis, light is absorbed by an adsorbed substrate. In photogenerated catalysis, the photocatalytic activity (PCA) depends on the ability of the catalyst to create electron–hole pairs, which generate free radicals (e.g. hydroxyl ra...
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http://en.wikipedia.org/wiki/Photocatalysis
(fo″to-kә-tal´ĭ-sis) promotion or stimulation of a chemical reaction by light. adj., photocatalyt´ic., adj.
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http://www.encyclo.co.uk/local/21001
photocatalysis 1. The promotion or stimulation of a reaction by light. 2. A change in the rate of a chemical reaction due to the action of light. 3. The acceleration or deceleration of the speed at which a chemical reaction occurs, caused by electromagnetic radiation and especially visible light.
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http://www.wordinfo.info/words/index/info/view_unit/2803/5
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