Landé interval rule
Rule in atomic physics / From Wikipedia, the free encyclopedia
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In atomic physics, the Landé interval rule [1] states that, due to weak angular momentum coupling (either spin-orbit or spin-spin coupling), the energy splitting between successive sub-levels are proportional to the total angular momentum quantum number (J or F) of the sub-level with the larger of their total angular momentum value (J or F). [2][3]