fine-structure

fine structure

[fahyn]
noun Physics.
a group of lines that are observed in the spectra of certain elements, as hydrogen, and that are caused by various couplings of the azimuthal quantum number and the angular momentum quantum number.


Origin:
1915–20

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fine structure
 
n
Compare hyperfine structure the splitting of a spectral line into two or more closely spaced components as a result of interaction between the spin and orbital angular momenta of the atomic electrons

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