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abstraction > mathematical concept > number > quantity > radiation measurement > spectral feature > set of lines > set of molecular lines > Q-branch

Q-branch
subject			fact

Q-branch	has definition A set of lines in the spectra of molecules corresponding to changes in vibrational energy with none in rotational energy.
	is a kind of set of molecular lines
set of molecular lines	has species molecule
spectral feature	has wavelength
	has width
	occurs in
radiation measurement	has unit radiation unit
number	has value