# Selection rules for Hydrogen

#### temp050505

Good afternoon,

Does the selection rules have a condition on $\Delta n$ ? I have not found a website or a book that show transitions between $2S_{1/2}$ and $2P_{3/2}$, that's why I was wondering if $\Delta n = 0$, with respect to the other selection rules, are allowed transitions.

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#### blue_leaf77

$\Delta n = 0$ is not a restriction for a transition to occur, in fact when one takes spin-orbit effect into account the levels of constant $n$ split further and transitions among them can happen.