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Pure Appl. Chem. Vol. 73, No. 2, pp. 377-379 (2001)

Pure and Applied Chemistry

Vol. 73, Issue 2

INORGANIC CHEMISTRY DIVISION
COMMISSION ON NOMENCLATURE OF INORGANIC CHEMISTRY

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

W. H. Koppenol

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

Abstract: 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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