Question: Write down all the possible third-order RayleighSchrdinger diagrams that have an initial state of a photon and a final state of an emitted phonon and

Write down all the possible third-order Rayleigh–Schrödinger diagrams that have an initial state of a photon and a final state of an emitted phonon and a photon, for two electron bands c and v. If you apply a selection rule that phonons do not cause electrons to change bands, which diagrams are eliminated?

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