symmetry number, \(s\)

https://doi.org/10.1351/goldbook.S06214
The symmetry number of a molecule is obtained by imagining all identical atoms to be labelled, and then counting the number of different but equivalent arrangements that can be obtained by rotating (but not reflecting) the molecule. In the statistical-mechanical treatment of @C01023@, the @P04439@ for each molecular species must be divided by its symmetry number.
Sources:
Green Book, 2nd ed., p. 40 [Terms] [Book]
PAC, 1996, 68, 149. (A glossary of terms used in chemical kinetics, including reaction dynamics (IUPAC Recommendations 1996)) on page 189 [Terms] [Paper]
Citation: 'symmetry number' in IUPAC Compendium of Chemical Terminology, 3rd ed. International Union of Pure and Applied Chemistry; 2006. Online version 3.0.1, 2019. https://doi.org/10.1351/goldbook.S06214 RIS BibTex EndNote
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Last revised: February 24, 2014