muonium

muonium
/myooh oh"nee euhm/, n. Physics.
an electron and a positively charged muon bound together by electrical attraction in the same manner as the electron and proton in a hydrogen atom.
[1955-60; MU(ON) + -onium, prob. extracted from POSITRONIUM]

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      short-lived quasi-atom composed of a positive muon (an antiparticle), as nucleus, and an ordinary negative electron. It is formed when a positive muon captures an atomic electron after being slowed down in matter. Muoniums form a few compounds with gases such as nitrogen dioxide and ethylene. Muonium research throws some light on the puzzling nature of muons (essentially heavy electrons) and their relation to ordinary electrons.

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Universalium. 2010.

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