polyatomic fragment
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https://doi.org/10.1351/goldbook.09412
Ion or neutral particle composed of three or more atoms.
Source:
PAC, 2020,
92
, 1781. 'Glossary of methods and terms used in surface chemical analysis (IUPAC Recommendations 2020)' on page 1842 (https://doi.org/10.1515/pac-2019-0404)