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When an excited electron returns to its ground state a photon is emitted.

Suppose that the electron's spin skip from +1/2 to -1/2 (around z)and that the photon has a momentum parallel to z.

I suppose that this photon has a circular polarization around z (Is it true?)

The problem is that there is no spin alone conservation but total angular momentum conservation.

Knowing all about |e> and |g> what can we calculate about the polarization of the emitted photon?

Have you links?

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# Polarization of an emitted photon

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