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abstraction > mathematical concept > number > quantity > radiation measurement > spectral feature > set of lines > multiplet > doublet

doublet
subject			fact

doublet	has definition In a spectrum, a pair of associated lines arising from transitions having a common lower energy level.
	is a kind of multiplet
spectral feature	has wavelength
	has width
	occurs in
	has species
radiation measurement	has unit radiation unit
number	has value