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量子力学 · 学部

Quantum Angular Momentum

The operator algebra that controls orbital and spin angular momentum.

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Algebra

Angular momentum operators satisfy

[Ji,Jj]=iϵijkJk.[J_i,J_j]=i\hbar\epsilon_{ijk}J_k.

Eigenvalues

The simultaneous eigenstates of J2J^2 and JzJ_z obey

J2jm=2j(j+1)jm,Jzjm=mjm.J^2|jm\rangle=\hbar^2j(j+1)|jm\rangle, \qquad J_z|jm\rangle=\hbar m|jm\rangle.
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