Recent content by Sebacide

This is the series: $$\sum_{n=1}^{+\infty}\sin(n)\sin\left(\frac{1}{n}\right)\left(\cos\left(\frac{1}{\sqrt{n}}\right)-1\right)$$

Hi, thank you for your help: I thought the same, but during class it was mentioned the ##\Delta \Lambda=0## only. So, if I have to describe the possible transition between two fixed electonic states, I have to separate the case in which one of the two lamdas is not zero and the one they are zero?

Hello! I have a question about selection rules and electronic transitions of a diatomic molecule: I can't find a good explanation about that, and there's so much confusion about the right rules to use. I studied that on Bransden-Joachain's "Physics of atoms and molecules", but there (to whom...