As quantum mechanical particles, both the proton and an electron have a property called spin – the particles act as if they were spinning on their axes. Because the proton is about 2000 times heavier than the electron, a simple picture of an atom is analogous to the Solar System: the heavy proton sits at the center of the system, while the electron orbits it. The hydrogen atom is composed of a proton and an electron, held together by their electric attraction.
How does the hydrogen atom produce spin-flip radiation?
