from The American Heritage® Dictionary of the English Language, 4th Edition
- n. 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
- n. a closely spaced structure of lines in the spectrum of an atom or molecule due to nuclear isotopic effects and/or to nuclear spin
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