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physical phenomena > event > atomic process > ionization > photoionization

photoionization comparison table

Subject	is a kind of	has definition
ionization	atomic process	Loss or gain by an atom of one or more electrons, by which process the atom becomes an ion and instead of being neutral, has a charge: positive if it has lost an electron, negative if it has gained one. High temperature is particularly conducive to ionization.
photoionization	ionization	The ionization of an atom or molecule by the absorption of a high-energy photon by the particle. It is an important source of opacity in stars.

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