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 (https://doi.org/10.1351/pac199668122223)