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. 2010 Aug;1(5):1–7. doi: 10.1038/ncomms1057

Figure 4. Effect of NO coadsorption on Ni(001).

Figure 4

XPS data recorded on a Ni(001) surface after exposure of ~6,000 L NO. The measurements were taken before (blue) and after (red) annealing at ~615 K. The O1s (a) and N1s (b) XP spectra clearly show that only the physisorbed NO is removed after annealing. The N/O intensity ratio is reduced after heating by a negligible extent, which suggests that the Ni(001) surface remained covered with nitrogen- and oxygen containing species even after annealing. We tentatively assign these species to chemisorbed Ni–oxygen/Ni–nitrogen and (NO)x. 'a.u.' represents arbitrary units.