The numbers following are the results of a lab experiment to find the spectral lines of Helium in a gas discharge tube. The lines I got were roughly:
703nm, 660nm, 590nm, 500nm, 490nm, 470nm, 450nm.
The question is, what possible electron transitions could the electrons have went though?
Energy level of hydrogen like atoms is given by:
The Attempt at a Solution
I'm getting some crazy answers like transitions from n=20 to n=5, or n=9 to n=5. Intuitively, this does not seem to be correct, although my intuition is based on the hydrogen atom which has visible lines only at n=x to n=2.
So... is this correct?