Thomas-Reiche-Kuhn sum rule

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Sum rule in quantum mechanics — In quantum mechanics, a sum rule is a formula for transitions between energy levels, in which the sum of the transition strengths is expressed in a simple form. Sum rules are used to describe the properties of many physical systems, including… … Wikipedia
Oscillator strength — An atom or a molecule can absorb light and undergo a transition from one quantum state to another. The oscillator strength is a dimensionless quantity to express the strength of the transition. The oscillator strength f12 of a transition from a… … Wikipedia
Kramers-Heisenberg formula — The Kramers Heisenberg dispersion formula is an expression for the cross section for scattering of a photon by an atomic electron. It was derived before the advent of quantum mechanics by Hendrik Kramers and Werner Heisenberg in 1925, based on… … Wikipedia

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