The term generally used to describe @I03183@ of any species by photons. The process may, for example, be written
Electrons and photons do not 'impact' molecules or atoms; they interact with them in ways that result in various electronic excitations including @I03183@. For this reason it is recommended that in @M03746@ the terms 'electron impact' and 'photon impact' not be used.
Orange Book, 2nd ed., p. 203 [Terms] [Book]
PAC, 1991, 63, 1541. (Recommendations for nomenclature and symbolism for mass spectroscopy (including an appendix of terms used in vacuum technology). (Recommendations 1991)) on page 1548 [Terms] [Paper]
PAC, 1996, 68, 2223. (Glossary of terms used in photochemistry (IUPAC Recommendations 1996)) on page 2261 [Terms] [Paper]