Adsorption and structure dependent desorption of CO on Co(0001)

被引：122

作者：

Lahtinen, J ^{[1
]}

Vaari, J ^{[1
]}

Kauraala, K ^{[1
]}

机构：

[1] Helsinki Univ Technol, Phys Lab, Helsinki 02015, Finland

来源：

SURFACE SCIENCE | 1998年 / 418卷 / 03期

关键词：

carbon monoxide; cobalt; low energy electron diffraction (LEED); low index single crystal surfaces; surface structure; thermal desorption spectroscopy; X-ray photoelectron spectroscopy;

D O I：

10.1016/S0039-6028(98)00711-0

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 adsorption of CO on the Co(0001) surface at room temperature and at 180 K has been studied using work function measurements, X-ray photoelectron spectroscopy, thermal desorption spectroscopy (TDS) and low energy electron diffraction. At low coverages and at room temperature the standard (root 3 x root 3)R30 degrees-CO structure was observed. By decreasing the temperature and increasing the CO exposure, other stable structures were found on the surface. The (root 7/3 x root 7/3)R10.9 degrees-CO structure was found in a small coverage range around theta = 0.43 ML and the (root 127 x root 12/7)R10.9 degrees structure with theta = 0.58 a;at saturation exposures. Each of the structures were attached to a specific desorption regime in the TDS spectrum. The position of the C 1s and O 1s core levels indicate single adsorption site in the two lower coverage structure and two different adsorption sites for the most dense adsorption layer. (C) 1998 Elsevier Science B.V. All rights reserved.

引用

页码：502 / 510

页数：9

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