 The MO diagram correlates with the experimental photoelectron spectrum for nitrogen.The 1σ electrons can be matched to a peak at 410 eV (broad), the 2σg electrons at 37 eV (broad), the 2σu electrons at 19 eV (doublet), the 1πu4 electrons at 17 eV (multiplets), and finally the 3σg2 at 15.5 eV (sharp).Oxygen has a similar setup to H2, but now we consider 2s and 2p orbitals.