| Definition: | number the product of which by the reduced Planck constant is the value of the component of the spin (113-05-09) onto a quantization axis NOTE 1 In the quantization direction z, the component of the spin is quantized as Sz = msħ, ms = s, s − 1, …, − s, where ms is spin magnetic quantum number and s is spin quantum number. NOTE 2 The quantization direction often can be chosen arbitrarily. In the presence of a magnetic field, the best choice for the quantization axis is the direction of the magnetic flux density.
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