In reply to [email protected]'s message of Wed, 13 May 2020 20:10:56 +0000: Hi, [snip] >It is also widely considered that angular momentum (AM) is also quantized >during physical system total energy transitions. Thus, if a system is >deconstructed such as Andrew suggests happens when a system emits a photon, >then (assuming conservation of angular momentum) the AM of each of the >separate parts of the original physical system should add up to the quantized >AM of the original physical system.
AFAIK the spin angular momentum of a photon is h-bar. If you look at the quantum rules for permitted transitions, then you will see that the change in total angular momentum of the electron has to be at least h-bar, as this is the amount needed to create a free photon. I suspect that they are usually emitted along the axis of rotation of the particle emitting them, i.e. perpendicular to the plane of rotation of the particle, and are circularly polarized. [snip]
