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All problems were repaired and were of short duration. The bonding of molecules to surfaces is of interest to a wide variety of researchers in surface and interface science. The advantage of XES for this experiment is that by tuning the incoming photon energy, experimenters can selectively excite electrons from one nitrogen atom or the other of the adsorbed N2 molecule, and not from the nickel surface. The group used this approach to produce separate spectra for each nitrogen atom. Also, the spectra show new molecular states that arise from interaction of molecular pi states with nickel d states.