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Pure and Applied Chemistry

The Scientific Journal of IUPAC

Ed. by Burrows, Hugh / Stohner, Jürgen

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Volume 73, Issue 2


Names for muonium and hydrogen atoms and their ions(IUPAC Recommendations 2001)

W. H. Koppenol
  • Corresponding author
  • Laboratorium für Anorganische Chemie, Eidgenössische Technische Hochschule, Zürich, Switzerland
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Published Online: 2009-01-01 | DOI: https://doi.org/10.1351/pac200173020377

Muons are short-lived species with an elementary positive or negative charge and a mass 207 times that of the electron. These recommendations concern positive muons, given the short lifetime of negative muons. A positive muon mimics a light hydrogen nucleus, and names are given in analogy to existing names for hydrogen-containing compounds. A particle consisting of a positive muon and an electron (µ+ e -) is named "muonium" and has the symbol Mu. Examples: "muonium chloride," MuCl, is the equivalent of deuterium chloride, 2 HCl or DCl; "muoniomethane", CH 3 Mu, is the product of the muoniation of methane;and NaMu is "sodium muonide."

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Published Online: 2009-01-01

Published in Print: 2001-01-01

Citation Information: Pure and Applied Chemistry, Volume 73, Issue 2, Pages 377–379, ISSN (Online) 1365-3075, ISSN (Print) 0033-4545, DOI: https://doi.org/10.1351/pac200173020377.

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