HREELS study on CO adsorbed on clean, nitrided and oxidized Fe/Ru(001) surfaces

Abstract

CO adsorption on as-deposited, nitrided and oxidized FeRu(001) surfaces was investigated using high resolution electron energy loss spectroscopy (HREELS), temperature programmed desorption (TPD), Auger electron spectroscopy (AES) and low energy electron diffraction (LEED). The behaviour of CO on FeRu(001) was compared to that on low Miller index planes of an Fe single crystal. It was found that the as-deposited Fe(1ML)Ru(001) surface resembles the Fe(110) surface. A single CO species with a ν(C−O) of 1860–1990 cm−1 was found on the as-deposited surface. A new molecular adsorption state appeared on the annealed FeRu(001) surface. This species has a higher C−O stretching frequency and a higher desorption temperature than the other species. The effects of nitridation and oxidation of FeRu(001) on CO adsorption were also investigated.