# Where can I find the energy spectrum of larger atoms (e.g. Nd$^{3+}$)?

I would like to find a ressource where the binding energies of the outer electrons of larger atoms are listed.

I'm discussing Neodymium lasers and I think it would be nice to have a graphic with all the different energy levels that will be used during the lasing process.

I would ideally have a nice picture similar to this one from Neodymium.

Image source: Hyperphysics, http://hyperphysics.phy-astr.gsu.edu/hbase/quantum/lithium.html, accessed 25. October 2020.

The data for levels would be on the NIST database, but I don't know where or how you could generate a chart of levels and transitions as you ask for (except by hand, of course). The data base does have details of multiply ionized states as well. To find $$\mathrm{Nd}^{3+}$$ you would search for "Nd IV", as "ND I" (and "Nd $$0$$" means the neutral states), and they use roman numerals to increment from that.