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abstraction > mathematical concept > number > quantity > radiation measurement > spectral feature > spectral line > emission line > radio recombination line

radio recombination line
subject			fact

radio recombination line	has definition Radio recombination lines are the result of electron transitions between high-n (n > 50) levels in an atom or ion.
	is a kind of emission line
emission line	has antonym absorption line
spectral line	has transition
	has equivalent width
spectral feature	has wavelength
	has width
	occurs in
	has species
radiation measurement	has unit radiation unit
number	has value