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photoionization
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 target being considered. For photon energies below the ionization threshold, the photoionization cross-section is near zero. But with the development of pulsed lasers it has become possible to create extremely intense, coherent light where multi-photon ionization may occur. At even higher intensities (around of infrared or visible light), non-perturbative phenomena such as ''barrier suppression ionization'' and ''rescattering ionization'' are observed.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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