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Studies on Adsorption System of Carbon Monoxide on Cs/Ru(1OO) Surface by Using Synchrotron Radiation
Wang Jian,Zhang Hanjie,Yan Chaojun,Li Haiyang,Bao Shining,Xu Yabo,Liu Fengqin,Kui Rexi,Qian Haijie
Author NameAffiliation
Wang Jian Physics Department, Zhejiang University, Hangzhou 310027 
Zhang Hanjie Physics Department, Zhejiang University, Hangzhou 310027 
Yan Chaojun Physics Department, Zhejiang University, Hangzhou 310027 
Li Haiyang Physics Department, Zhejiang University, Hangzhou 310027 
Bao Shining Physics Department, Zhejiang University, Hangzhou 310027 
Xu Yabo Physics Department, Zhejiang University, Hangzhou 310027 
Liu Fengqin Laboratory for Synchrotron Radiation, Institute of High Energy Physics, Academia Sinica, Beijing 100039 
Kui Rexi Laboratory for Synchrotron Radiation, Institute of High Energy Physics, Academia Sinica, Beijing 100039 
Qian Haijie Laboratory for Synchrotron Radiation, Institute of High Energy Physics, Academia Sinica, Beijing 100039 
Abstract:
The molecular orbits of CO are rearranged under the strong influence of coadsorbed Cs atoms. HREELS study shown that there are two molecular adsorption states of CO on a Cs pre-covered Ru(1010) surface. One with high C-O stretch frequency similar to that on clean Ru(1010) surface, the other with low C-O stretch frequency due to the strong short-range interaction between the CO molecule and the Cs atom. ARUPS experiment results shown the peak for CO on dean Ru(1010) surface, at 7.5eV BE attributed to the 5σ and 1πorbits, is split into two peaks with one at 6.3 eV BE and the other at 7.8 eV BE. Two concrete models has been proposed to describe the short-range alkali metal-CO interaction, the sp2 rehybridization model and the direct interaction model. The experiment results confirm that the sp2 rehybridization model must be reasonable. According this model, the Me-CO bond rehybridizes to sp2 forming new a and πt bonds (a1' b1' b2 orbits in the C2v point group) According The p-polarized ARUPS results, the peak at 6.3eV BE, comes from one of a π type lb2 orbits, shows an anti-symmetry character about the plane parallel to the <0001>crystallographic direction in the surface. Another π type orbit 1b1 is still at 7.8eV BE overlapping with 5a1 orbit.
Key words:  Synchrotron radiation, CO, Cs/Ru(100)
FundProject:国家自然科学基金和浙江省自然科学基金资助项目
用同步辐射光研究CO在Cs/Ru(100)表面的吸附
汪健,张寒洁,颜朝军,李海洋,鲍世宁,徐亚伯,刘凤琴,奎热西,钱海杰
摘要:
(CO+Cs)/Ru(1010)共吸附的体系中,CO分子由于受CS原子强烈影响,分子轨道发生重新杂化组合.CO分子原来在清洁Ru(1010)表面上结合能位于7.5eV处相重叠的5σ和1π轨道对应谱峰分裂为两峰,结合能分别位于6.3和7.8eV处.其中6.3eV处的谱峰来自CO分子1π轨道的一支,它显示出该分子轨道沿衬底<0001>晶向的镜面反对称性.CO分子1π轨道的另一支和5σ轨道在结合能7.8eV处相重叠.
关键词:  同步辐射  CO  Cs/Ru(1010)表面
DOI:10.1088/1674-0068/13/2/243-248
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