Visible Light Transitions in Li++ (Z=3)

[ChiefKeeper92]

1. Assuming that the wavelengths of visible light lie between about 300nm and 700nm, what transitions in Li++ (hydrogenic lithium ions, Z=3) would be visible. Identify each transition by initial and final principal quantum number n. Also identify those transitions that are also seen in hydrogen (3->2, 4->2, 5->2 in hydrogen)

2. E=13.6eV*(Z^2)*((1/n)^2-(1/m)^2)
λ=1240/E


3. I ran through it but I keep getting the same wavelengths as hydrogen. I don't know what I'm doing wrong. Do I multiply n*Z on the bottom before I square it?

 

[Spinnor]

About 2/3 the way down this link,

http://hyperphysics.phy-astr.gsu.edu/hbase/hyde.html

There is a calculator that allows you to plug in z, n_initial, and n_final and get both wavelength and energy.

Hope this helps.