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IEVref:113-05-41ID:
Language:enStatus: Standard
Term: hyperfine level
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Definition: each of the energy levels of an atom or molecule resulting from the splitting of an electronic level due mainly to the coupling of electron and nucleus magnetic moments

NOTE The transition between the two hyperfine levels of the ground state of the caesium 133 atom is used for the definition of the second in SI (see 112-02-04).


Publication date:2011-04
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Internal notes:2017-06-02: Cleanup - Remove Attached Image 113-05-41en.gif
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