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photoionization

[foh-toh-ahy-uh-nuh-zey-shuh n] /ˌfoʊ toʊˌaɪ ə nəˈzeɪ ʃən/
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.
Origin
1910-1915
1910-15; photo- + ionization
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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