He+ Energy Level Diagram: Interaction Effects?

[MonsieurWise]

For drawing a energy level diagram of He+ (singly ionized He), do I draw it without the interaction of the "outside" electron, thus no effect of orbital angular quantum number l (because there's only 1 electron left). Or should I draw it with the interaction with the "outside" electron, leading to the effect the orbital angular quantum number l make on the energy level? Because if I'm not wrong, the effect of l on energy levels is based on electron interaction, right? (I'm trying to draw an energy diagram explaining the spectrum of Helium)

 

[Bob S]

If it is singly ionized helium, with only one electron bound in any quantum state, then the energy levels are like an isolated hydrogen atom with a doubly-charged proton, except that the reduced mass correction is less. This is a gas molecule, so it is not close to a loose electron or to other molecules in a solid or liquid.

 

[MonsieurWise]

Thank you, so there will be no effect of the 2nd quantum number on the energy level of He+, right?
Thanks!

 

[Bob S]

If you mean for the He+ ion excited states, that there is no effect on n and l ( l <= n-1), it is a single-electron atom and should be hydrogen-like. So it has both fine structure and hyperfine structure, Lamb shifts, etc..