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muonium

[myoo-oh-nee-uh m] /myuˈoʊ ni əm/
noun, Physics.
1.
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.
Origin
1955-1960
1955-60; mu(on) + -onium, probably extracted from positronium
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples for muonium
  • He was conducting a laser experiment used to measure the energy levels of muonium, an atom consisting of a muon and an electron.
  • Helium gas is used to inhibit muonium formation by positive muons.
Encyclopedia Article for muonium

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.

Learn more about muonium with a free trial on Britannica.com
Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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