NO2 adsorption on Ni(100): A comparison of NO2 with CO2 adsorption

Geisler, H.; Odörfer, G.; Illing, G.; Jaeger, R.; Freund, Hans-Joachim; Watson, G.; Plummer, E.W.; Neuber, M.; Neumann, M.

doi:10.1016/0039-6028(90)90557-O

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NO₂ adsorption on Ni(100): A comparison of NO₂ with CO₂ adsorption

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Geisler, H., Odörfer, G., Illing, G., Jaeger, R., Freund, H.-J., Watson, G., et al. (1990). NO₂ adsorption on Ni(100): A comparison of NO₂ with CO₂ adsorption. Surface Science, 234(3), 237-250. doi:10.1016/0039-6028(90)90557-O.

Cite as: https://hdl.handle.net/21.11116/0000-000E-7163-3

Abstract

NO₂ adsorption has been studied on Ni(100) at temperatures between 90 and 400 K via HREELS, ARUPS, XPS and NEXAFS. It is shown that NO₂ dissociates at low temperatures and small exposures forming atomic oxygen and molecularly adsorbed NO. HREELS data of NO/Ni(100) in comparison with those of NO+O/Ni(100) indicate that the molecular axis of NO in the coadsorbed layer is tilted away from the surface normal. After saturation of the dissociative adsorption NO₂ will chemisorb on the surface. This has been followed by HREELS and XPS. NEXAFS data indicate that the chemisorbed NO₂ moiety is adsorbed with the molecular plane perpendicular to the surface plane and the nitrogen end down. At high NO₂ exposures and at low temperatures physisorbed N₂O₄ is formed on top of this relatively complex chemisorbed layer. It is likely that the molecular plane of N₂O₄ is oriented parallel to the metal surface. The adsorption of NO₂ on Ni(100) is compared with other NO₂ adsorption systems, and it is shown in comparison with the HREELS data of another triatomic, i.e. CO₂, that the vibrational spectra represent finger prints of the adsorption geometry of these triatomic molecules.