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rotational sum rule

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rotational sum rule [rō′tā·shən·əl ′səm ‚rül]
(spectroscopy)
The rule that, for a molecule which behaves as a symmetric top, the sum of the line strengths corresponding to transitions to or from a given rotational level is proportional to the statistical weight of that level, that is, to 2J+1, whereJis the total angular momentum quantum number of the level.


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