Thomas-Reiche-Kuhn sum rule

Thomas-Reiche-Kuhn sum rule

[′täm·əs ′rīk·ə ′kyün ′səm ‚rül]
(atomic physics)
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is known variously as the f-sum rule, the oscillator-strength sum rule, and the Thomas-Reiche-Kuhn sum rule. The f-sum rule may also be regarded as a high-frequency limit of the Kramers-Kronig relations (5); in this case, the multiplication by [omega] before Eq.