singlet-singlet annihilation

https://doi.org/10.1351/goldbook.S05697
See:
annihilation (in radiochemistry, in photochemistry)
,
spin conservation rule
Source:
PAC, 1996, 68, 2223. (Glossary of terms used in photochemistry (IUPAC Recommendations 1996)) on page 2273 [Terms] [Paper]