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8.2: Total Angular Momentum
Orbital angular momentum
Spin angular momentum
Total angular momentum
L, Lz, S, SzJ and Jz are quantized.
Spin-Orbit Coupling
• An effect of the spins of the electron and the orbital angular
momentum interaction is called spin-orbit coupling.
• The dipole potential energy
.
• The spin magnetic moment 
•
•
.
is the magnetic field due to the proton.
where cos a is the angle between
.