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

fine structure
subject			fact

fine structure	has definition 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.
	is a kind of set of lines
spectral feature	has wavelength
	has width
	occurs in
	has species
radiation measurement	has unit radiation unit
number	has value