hyperfine structure

small shifts and splittings in the energy levels of atoms, molecules and ions

en-GB/ˈhaɪpəˌfaɪn ˈstɹʌkt͡ʃə/
en-US/ˈhaɪpɚfaɪn ˈstɹʌkt͡ʃɚ/

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fine structurestructure