Infrared spectra of high coverage CO adsorption structures on Pt(111)
Infrared spectra of high coverage CO adsorption structures on Pt(111)
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DOI：
10.1016/j.susc.2010.04.021
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发表时间：
2010-08-15
期刊：
影响因子：
1.9
通讯作者：
Sterrer, Martin
中科院分区：
文献类型：
--
作者：
Carrasco, Esther;Aumer, Andreas;Sterrer, Martin
采用偏振调制红外反射吸收光谱（PM-IRAS）和和频产生光谱（SFG）研究了CO在Pt（111）表面的吸附。在10 ~（-7）~ 100 mbar、200 ~ 300 K的温度范围内，连续暴露于CO气体中，在2110 cm（-1）和2097 cm（-1）处探测到两个CO在顶信号。形成较高的波数信号被发现是动力学限制低于200 K和一个稳定的c（4 × 2）吸附层在超高真空的存在下。根据本研究的结果和之前的实验发现，两个顶部信号与Pt（111）上不同的CO压缩层有关，其中θ>0.5、六边形莫尔晶格和矩形重合晶格。(C)2010 Elsevier B. V.保留所有权利。
The adsorption of carbon monoxide on Pt(111) was studied using polarization modulation infrared reflection absorption spectroscopy (PM-IRAS) and sum frequency generation (SFG) spectroscopy. Two CO on-top signals at 2110 cm(-1) and 2097 cm(-1) have been detected under continuous CO exposure in a pressure range from 10(-7) to 100 mbar and at temperatures between 200 K and 300 K. The formation of the higher wavenumber signal is found to be kinetically limited below 200 K and by the presence of a stable c(4 x 2) adlayer in UHV. On the basis of the results presented in this study and previous experimental findings the two on-top signals are related to different CO compression layers on Pt(111) with theta>0.5, hexagonal Moire lattices and rectangular coincident site lattices. (C) 2010 Elsevier B.V. All rights reserved.