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

R-branch
subject			fact

R-branch	has definition A set of lines in the spectra of molecules corresponding to unit decreases 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