The quantum mechanics of angular momentum is fascinating. It is also very basic to much of quantum mechanics. It is a model for dealing with other systems of particles
In chapter 5.4, it was already mentioned that angular
momentum of particles comes in two basic kinds. Orbital angular
momentum is a result of the angular motion of particles, while spin is
built-in angular momentum of the particles.
Orbital angular momentum is usually indicated by
However, this chapter will use