Photoionization is the physical process in which an ion is formed from the interaction of a photon with an atom or molecule.[2]
- ^ "Hubble finds ghosts of quasars past". ESA/Hubble Press Release. Retrieved 23 April 2015.
- ^ IUPAC, Compendium of Chemical Terminology, 2nd ed. (the "Gold Book") (1997). Online corrected version: (2006–) "photoionization". doi:10.1351/goldbook.P04620