Ciro Santilli
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Hyperfine structure | 🗖 nosplit | ↑ parent "Spectral lines of atoms and molecules" | 65

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Small splits present in all levels due to interaction between the electron spin and the nuclear spin if it is present, i.e. the nucleus has an even number of nucleons.
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Appears to be explained by quantum electrodynamics but not the Dirac equation. TODO confirm.
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TODO how it differs from Lamb shift?
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