When an electron generates a photon by a change of motion, does that mean the electron is solely responsible for generating the photon? Or, is the electron part of a system of particles and fields so when it changes its momentum the photon could be generated by the systems field interactions rather than by the single electron. Eg. The electron is interacting with the atomic system field that binds it to the system nucleus and when the electron changes momentum it affects the interaction by the electron changing its speed relative to the systems nucleus field motion/spin. A de-synchronized moving electric charge in a moving magnetic field generates? If the electron is in synchronized motion with the systems field then nothing is generated?