multiplet intensity rules

multiplet intensity rules

[′məl·tə·plət in′ten·səd·ē ‚rülz]
(spectroscopy)
Rules for the relative intensities of spectral lines in a spin-orbit multiplet, stating that the sum of the intensities of all lines which start from a common initial level, or end on a common final level, is proportional to 2 J +1, where J is the total angular momentum of the initial level or final level respectively.
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