Onium

Not to be confused with onium ions such as ammonium.
Antimatter
A Feynman diagram showing the annihilation of an electron and a positron (antielectron), creating a photon that later decays into an new electron–positron pair.
Antiparticles

Onia

Concepts and phenomena
Devices
Uses
Scientists

An onium (plural: onia) is a bound state of a particle and its antiparticle.[1] These states are usually named by adding the suffix -onium to the name of one of the constituent particles (replacing an -on suffix when present), with one exception for "muonium"; a muon–antimuon bound pair is called "true muonium" to avoid confusion with old nomenclature.[a]

  1. ^ Walker, D.C. (1983). Muon and Muonium Chemistry. Cambridge University Press. p. 5. ISBN 978-0-521-24241-7. Retrieved 23 June 2020.


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