Recent content by FountainPen

Thanks for explaining what He II is. I thought there would be some sort of mathematical way to determine the transition without brute force. Oh well.

Homework Statement What is the electronic transition of He II when it emits 468.6 nm photon.Homework Equations \frac{1}{\lambda}=4R\left(\frac{1}{m^2}-\frac{1}{n^2}\right)The Attempt at a Solution I know it is a pashen-alpha line from googling but I don't know how to find that from this...