I don't really understand the hyperfine structure. I understand, that the magnetic dipole moment of the nucleus interacts with the spin of an electron, causing a split between the energy levels of spin states (like the Zeeman effect?). However, I do not understand how/why is there an oscillating transition between these states?
I've read that a spin correlated radical pair will oscillate between triplet and singlet states due to the effects of the hyperfine interaction. Is this oscillation caused by absorption and re-emission of photons?
Also, how can an external magnetic field influence this oscillation?
I've tried to read a lot of literature on this online but unfortunately, I am not a physicist, I do not know enough physics or mathematics to understand a lot of the explanations. (I only know basic electrodynamics and chemistry). I'm just trying to get an intuitive model, an idea of what is happening. I need it to understand magnetic field effects on biological systems.
If someone could explain this to me (even in layman's terms), I'd be really glad. Thank you.