I am trying to evaluate the inner product $<2S_{\frac{1}{2}},F',F'_{3}|\delta^{3}(x)\sigma_{i}P_{i}|2P_{\frac{1}{2}},F,F_{3}>$ It's written in the form $<nl_{j},F,F_{3}|$ Where $P_{i}$ in the momemtum operator for electron wave function , $j$ is the total angular momemtum of electron and $F$,$F_{3}$ are the total angular momemtum and it's projection along z axis.I tried solving it using Clebsch Gordon coefficients but couldn't get the answer. Any idea on how to solve it?
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