Photoionization is the physical process in which an ion is formed from the interaction of a photon with an atom or molecule. ==Cross section== Not every photon which encounters an atom or ion will photoionize it. The probability of photoionization is related to the photoionization cross-section, which depends on the energy of the photon and the ta...
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http://en.wikipedia.org/wiki/Photoionization
The ionization of an atom or molecule by the absorption of a high-energy photon. It is an important source of opacity in stars.
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http://www.daviddarling.info/encyclopedia/P/photoionization.html
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