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

被引：7

作者：

Caputi, LS ^{[1
]}

Chiarello, G ^{[1
]}

Amoddeo, A ^{[1
]}

Agostino, RG ^{[1
]}

Papagno, L ^{[1
]}

Colavita, E ^{[1
]}

机构：

[1] UNIV CALABRIA,DIPARTIMENTO FIS,I-87036 RENDE,COSENZA,ITALY

来源：

SURFACE SCIENCE | 1996年 / 356卷 / 1-3期

关键词：

carbon monoxide; chemisorption; electron energy loss spectroscopy; low energy electron diffraction (LEED); low index single crystal surfaces; nickel; nitrogen oxides; photoelectron diffraction;

D O I：

10.1016/0039-6028(96)00009-X

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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.

引用

页码：189 / 194

页数：6

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