# Selection rules for Hydrogen

1. Oct 25, 2010

### barnflakes

Why is there no allowed transition from the $2s^2 S_{\frac{1}{2}}$ state to the $2p^2 P_{\frac{3}{2}}$ state in the attached image? It seems to fulfill the selection rules $\Delta l = \pm 1$ and $\Delta j = 0, \pm 1$. This is for electric dipole transitions by the way.

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2. Oct 26, 2010

### DrDu

I guess that only optical transitions are shown in the diagram while this transition would be somewhere in the radio frequency region.