Adsorption of carbon monoxide on Au(110)-(1 x 2)

被引：127
作者：
Gottfried, JM [1 ]
Schmidt, KJ [1 ]
Schroeder, SLM [1 ]
Christmann, K [1 ]
机构：
[1] Free Univ Berlin, Inst Chem, D-14195 Berlin, Germany
来源：
SURFACE SCIENCE | 2003年 / 536卷 / 1-3期
关键词：
carbon monoxide; gold; physical adsorption; chemisorption; thermal desorption spectroscopy; photoelectron spectroscopy; work function measurements; near edge extended x-ray absorption fine structure (NEXAFS);
D O I：
10.1016/S0039-6028(03)00595-8
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 carbon monoxide on a gold (11 0)-(l x 2) surface was studied between 28 and 300 K by means of TDS, UPS, DeltaPhi, NEXAFS, and LEED. Below 150 K, CO adsorbs non-dissociatively with high initial sticking probability (S-0 = 0.9 at 28 K). The isosteric heat of CO adsorption is 59 kJ/mol for Theta(CO) --> 0 and decreases strongly with coverage, indicating weak chemisorption and substantial CO-CO repulsion, in agreements with TDS results. Thermal desorption spectra show at least five desorption states corresponding to desorption energies between 38 and 8 kJ/mol. According to TDS, chemisorbed and physisorbed CO coexist in the first layer, a result that is corroborated by UV photoemission spectra. CO adsorption has a complex influence on DeltaPhi and leads to a work function reduction of -0.95 eV at monolayer coverage. TDS and entropy measurements suggest that the state of chemisorbed CO at 160 K is best described by the model of a two-dimensional gas. No ordered CO overlayer structures were observed in the whole coverage and temperature range. (C) 2003 Elsevier Science B.V. All rights reserved.
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页码：206 / 224
页数：19
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