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Quantum Spin
Linked via "Stern-Gerlach experiment"
Stern-Gerlach Experiment and Spin Measurement
The existence of quantum spin was definitively established through the Stern-Gerlach experiment (1922). In this experiment, a beam of neutral silver atoms (whose net orbital angular momentum cancels out, leaving only the electron spin) is passed through an inhomogeneous magnetic field.
Classically, one would expect the beam to spread into a continuous line corresponding to all possible orientations of the magnetic dipole moment. However, the beam splits dist…