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abstraction > mathematical concept > number > quantity > radiation measurement > spectral feature > set of lines > fine structure

fine structure comparison table

Subject	is a kind of	has definition
set of lines	spectral feature	A set of absorption or emission lines in the spectra of a celestial object
fine structure	set of lines	Splitting of spectral lines by the spin-orbit energy - i.e., the potential energy of the inherent electron magnetic moment in the atom's own magnetic field.

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