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)
Caputi LS;Chiarello G;AGOSTINO, Raffaele Giuseppe;
1996-01-01
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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
