Spin is a physical quantity, brought the concept of quantum pure, there is no concept of Spin within classical mechanics. Spin essentially as an angular momentum of particle behavior specific to intrinsic properties and there is a physical quantity analogous as in classical mechanics. This concept was launched by g. s. Goudsmith and Uhlenbeck in 1925 to explain the separation of the spectral line emitted by atoms. In this article, I will present the theory of Spin operators elelctron, private eye-private function problem and Davisson-Germer experiment to verify the wave nature of the electron de Broglie's theory before.
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