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[foh-toh-ahy-uh-nuh-zey-shuh n]
See more synonyms for photoionization on Thesaurus.com
noun 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.
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Origin of photoionization

1910–15; photo- + ionization
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018