Spin quantum number
Quantum number parameterizing spin and angular momentum / From Wikipedia, the free encyclopedia
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In physics and chemistry, the spin quantum number is a quantum number (designated s) that describes the intrinsic angular momentum (or spin angular momentum, or simply spin) of an electron or other particle. It has the same value for all particles of the same type, such as s = 1/2 for all electrons. It is an integer for all bosons, such as photons, and a half-odd-integer for all fermions, such as electrons and protons.
This article may be too technical for most readers to understand. (February 2024) |
The component of the spin along a specified axis is given by the spin magnetic quantum number, conventionally written ms.[1][2] The value of ms is the component of spin angular momentum, in units of the reduced Planck constant ħ, parallel to a given direction (conventionally labelled the z–axis). It can take values ranging from +s to −s in integer increments. For an electron, ms can be either ++1/2 or −+1/2 .