2003 Surface chemistry

Surface chemistryG 7000 Low-Temperature Oxidation of Nitrided Iron Surfaces. — As revealed by XPS,

reflection absorption IR spectroscopy, and mass spectrometry FexNyOz, NO+, as well as nitrite/nitrito- and nitrate-type species form on nitrided Fe surfaces exposed to O2 and H2O at low temperatures (< 150 K). No molecular N2 is produced during reactions with oxygen or water in contrast to oxidation on other transition metal nitrides. Upon an-nealing of the oxidized overlayer, nitrogen desorbs exclusively as NO between 250 and 400 K. In contrast to oxygen, the reactivity of nitrided Fe surfaces toward water is lim-ited to the production of adsorbed N—O species. — (TORRES, J.; PERRY, C. C.; BRANSFIELD, S. J.; FAIRBROTHER*, D. H.; J. Phys. Chem. B 107 (2003) 23, 5558-5567; Dep. Chem., Johns Hopkins Univ., Baltimore, MD 21218, USA; Eng.) — W. Pewestorf

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