radiationless deactivation

Also contains definition of: radiationless decay
https://doi.org/10.1351/goldbook.R05056
Loss of electronic @E02250@ without photon emission or chemical change. Often, ultrafast radiationless decays are mediated by conical intersections.
Source:
PAC, 2007, 79, 293. (Glossary of terms used in photochemistry, 3rd edition (IUPAC Recommendations 2006)) on page 410 [Terms] [Paper]