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## Quantum yield
The For example, in a chemical photodegradation process, when a molecule falls apart after absorbing a light quantum, the quantum yield is the number of destroyed molecules divided by the number of photons absorbed by the system. Since not all photons are absorbed productively, the typical quantum yield will be less than 1. Quantum yields greater than 1 are possible for photo-induced or radiation-induced chain reactions, in which a single photon may trigger a long chain of transformations. One example is the reaction of hydrogen with chlorine, in which a few hundred molecules of hydrochloric acid are typically formed per quantum of blue light absorbed. In optical spectroscopy, the ## See alsoQuantum Efficiency Categories: Radiation | Spectroscopy | Photochemistry |

This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Quantum_yield". A list of authors is available in Wikipedia. |