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Photoionization
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{{Short description|Ion formation via a photon interacting with a molecule or atom}} {{Use American English|date = April 2019}} [[File:Hubble green filaments 20150402.jpg|thumb|300px|Photoionization is the process that makes once-invisible filaments in deep space glow.<ref>{{cite news|title=Hubble finds ghosts of quasars past|url=http://www.spacetelescope.org/news/heic1507/|access-date=23 April 2015|work=ESA/Hubble Press Release}}</ref>]] '''Photoionization''' is the physical process in which an ion is formed from the interaction of a [[photon]] with an [[atom]] or [[molecule]].<ref>{{GoldBookRef|title=photoionization|file=P04620}}</ref>
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