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Meaning of photoionization

pho•to•i•o•ni•za•tion

Pronunciation: (fō"tō-ī"u-nu-zā'shun), [key]
— n. Physics.
  1. the phenomenon in which the absorption of electromagnetic radiation by an atom in a gas induces the atom to emit a bound electron and thereby become ionized.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.