
In atomic physics, hyperfine structure is the different effects leading to small shifts and splittings in the energy levels of atoms, molecules and ions. The name is a reference to the fine structure which results from the interaction between the magnetic moments associated with electron spin and the electrons` orbital angular momentum. Hyperfine....
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in spectroscopy, the splitting of a spectral line into a number of components. The splitting is caused by nuclear effects and cannot be observed in ... [4 related articles]
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http://www.britannica.com/eb/a-z/h/91

the multiplet of peaks you see in the ESR spectrum. The source of this splitting is the magnetic field arising from nuclear magnetic momets within the molecule. Generally, for molecules with a spin of I, you see 2n+1 peaks coming from the splitting. The appearance of the peaks is governed by pascal`s triangle, much like the ...
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http://www.chemistry-dictionary.com/definition/hyperfine+structure.php

The splitting of spectral lines into two or more very closely spaced components caused by interaction between the intrinsic spin of electrons and the intrinsic spin of the atomic nuclei they orbit. The splitting is much closer than in fine structure and only visible at the highest spectral resolutio...
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the splitting of the lines of an atomic spectrum, produced by the angular momentum of the nucleus of the atom. Cf. fine structure.
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https://www.infoplease.com/dictionary/hyperfine-structure
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