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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, 2HCl or DCl; “muoniomethane”, CH3Mu, is the product of the muoniation of methane; and NaMu is “sodium muonide.”
Pure Appl. Chem., Vol. 73, No. 2, pp. 377–380, 2001.
IUPAC Recommendations 2001
© 2001 IUPAC
IUPAC permission is acknowledged
Abstract
The effects resulting from the interaction of electromagnetic radiation with matter provide evidence for microscopic behavior. These observations lead us to propose models that enable understanding or predicting the properties of the material studied. Usually these models are associated with principles and concepts related to quantum mechanics. This topic will present the basic concepts necessary to understand the spectroscopic effects associated with the phenomenon of absorption and emission of light.
Keywords
Spectroscopy, Born-Oppenheimer approximation, radiation, density of energy, Einstein coefficients, Beer-Lambert Law, selection rules, Morse potential, Franck-Condon Principle
Author
Adalberto B. M. S. Bassi
Universidade Estadual de Campinas, Instituto de Química
Translated by
João C. de Andrade
Revised by
Carol C. Collins
