https://doi.org/10.1351/goldbook.A00366
- (in radiochemistry) An interaction between a particle and its antiparticlein which they both disappear.
- (in photochemistry) Two atoms or molecular entities both in an excited electronic stateinteract often (usually upon collision) to produce one atom or molecular entity in an excitedelectronic stateand another in its groundelectronic state. This phenomenon (annihilation) is sometimes referred to asenergy pooling.See:singlet-singlet annihilation,spin conservation rule,triplet-triplet annihilation