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annelationannulation
annihilation
  1. (in radiochemistry) An interaction between a particle and its antiparticle in which they both disappear.
    Source:
    Orange Book, p. 211
  2. (in photochemistry) Two atoms or molecular entities both in an excited electronic state interact often (usually upon collision) to produce one atom or molecular entity in an excited electronic state and another in its ground electronic state. This phenomenon (annihilation) is sometimes referred to as energy pooling.
    See: singlet-singlet annihilation, spin-conservation rule, triplet-triplet annihilation
    Source:
    PAC, 1996, 68, 2223 (Glossary of terms used in photochemistry (IUPAC Recommendations 1996)) on page 2228
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Cite as: IUPAC Compendium of Chemical Terminology, Electronic version, http://goldbook.iupac.org/A00366.html.
Transformed and rewritten from PDF version (entry http://www.iupac.org/goldbook/A00366.pdf)
by: Miloslav Nic, Jiri Jirat, Bedrich Kosata, ICT Prague, Czech Republic
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