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abstraction > mathematical concept > number > quantity > radiation measurement > spectral feature > set of lines > set of molecular lines > R-branch
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R-branch comparison table
Subject is a kind of has definition
set of molecular linesset of lines 
R-branchset of molecular linesA set of lines in the spectra of molecules corresponding to unit decreases in rotational energy.

Next set of molecular lines: band head    Up: set of molecular lines    Previous set of molecular lines: Q-branch