The coadsorption of CO and NO on Ni(lll) at room temperature has been studied by HREELS, LEED and angle-scanned XPD techniques. The experiments have been carried out by first exposing the clean surface to one gas up to the observation of a c(4 x 2) LEED pattern, and then by monitoring the step-wise addition of the other. CO does not modify or adsorb on a c(4 x 2)-NO layer, while 1 L NO causes the complete desorption of a c(4 x 2)-CO layer. The LEED pattern is always c(4 x 2), even if both CO and NO species are present on the surface. For NO exposures lower than 1 L of the GO-covered Ni(lll) surface, XPD measurements show that NO molecules are in a bent geometry, while CO molecules are perpendicular to the surface. Our results indicate that the NO-Ni interaction is very weakly affected by the presence of coadsorbed CO.

HREELS, LEED and angle-scanned XPD investigation of the coadsorption of CO and NO on Ni(111)

Chiarello G;AGOSTINO, Raffaele Giuseppe;
1996

Abstract

The coadsorption of CO and NO on Ni(lll) at room temperature has been studied by HREELS, LEED and angle-scanned XPD techniques. The experiments have been carried out by first exposing the clean surface to one gas up to the observation of a c(4 x 2) LEED pattern, and then by monitoring the step-wise addition of the other. CO does not modify or adsorb on a c(4 x 2)-NO layer, while 1 L NO causes the complete desorption of a c(4 x 2)-CO layer. The LEED pattern is always c(4 x 2), even if both CO and NO species are present on the surface. For NO exposures lower than 1 L of the GO-covered Ni(lll) surface, XPD measurements show that NO molecules are in a bent geometry, while CO molecules are perpendicular to the surface. Our results indicate that the NO-Ni interaction is very weakly affected by the presence of coadsorbed CO.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/20.500.11770/134534
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