from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun Any of the spectral lines formed from the splitting of broader spectral lines as a result of the interaction between the magnetic moments of electrons and atomic nuclei.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun physics a closely spaced structure of
linesin the spectrumof an atomor moleculedue to nuclear isotopic effectsand/or to nuclear spin
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