In this work, the Zeeman effect.  Simple and complex.  The electron moves in the atom. Since this motion is not rectilinear, the electron has an angular momentum (in classical physics, the angular momentum of particle relative to some origin is determined by the vector product of its radius vector and momentum, here m - the mass of the particle, v - its velocity, r - the radius vector). This formula is considered inapplicable for microparticles, since the radius and velocity cannot be determined simultaneously (See to the uncertainty relation). The moment of momentum because of the movement in space is called orbital.  According to quantum theory, the modulus of the orbital momentum vector is equal to here l - the number of orbital quantum which takes the values ​​0, 1, 2, ... Thus, the angular momentum of the electron L, like the energy, is quantized, namely, takes discrete values.

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