improper rotation axis symbol: Sn

https://doi.org/10.1351/goldbook.08615
In spectroscopy, a rotation-reflection axis, which is a symmetry element such that rotation by 2π/n about the axis followed by reflection through a plane perpendicular to the axis transforms an object into itself.
Note:
In crystallography, a rotation-inversion axis, which is a symmetry element such that rotation by 2π/n about the axis followed by inversion through the centre of symmetry transforms an object into itself.
Source:
PAC, 2021, 93, 647. (Glossary of methods and terms used in analytical spectroscopy (IUPAC Recommendations 2019)) on page 750 [Terms] [Paper]
Citation: 'improper rotation axis' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.08615 RIS BibTex EndNote
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