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

Thank you for your answers.