A semi-classical explanation of the Stern-Gerlach experiment and the quantization of electron spin

The spatial quantization of electron intrinsic spin at its two and only discrete values (-1/2)ħ spin down and (+1/2)ħ spin up at the z-axis under the influence of an external magnetic field B is explained using classical mechanics and the Stern-Gerlach experiment. The key for deciphering this centuries old riddle was the realization of the unified electromagnetic flux manifold of the charge and intrinsic magnetic moment of the electron. ©The Author, 2021