Onium

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]

^ 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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[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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