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Pure and Applied Chemistry

The Scientific Journal of IUPAC

Ed. by Burrows, Hugh / Weir, Ron / Stohner, Jürgen

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

W. H. Koppenol1

1Laboratorium für Anorganische Chemie, Eidgenössische Technische Hochschule, Zürich, Switzerland

Citation Information: Pure and Applied Chemistry. Volume 73, Issue 2, Pages 377–379, ISSN (Online) 1365-3075, ISSN (Print) 0033-4545, DOI: 10.1351/pac200173020377, January 2009

Publication History

Published Online:

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."


  • 1

    2013, None, 109, S. 65 [CrossRef], McKenzieIain, Annual Reports Section "C" (Physical Chemistry), Annu. Rep. Prog. Chem., Sect. C: Phys. Chem., 0260-1826, The positive muon and μSR spectroscopy: powerful tools for investigating the structure and dynamics of free radicals and spin probes in complex systems

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