The geometric and electronic structure of TCNQ and TCNQ+Mn on Ag(001) and Cu(001) surfaces
The geometric and electronic structure of TCNQ and TCNQ+Mn on Ag(001) and Cu(001) surfaces
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DOI：
10.1016/j.elspec.2015.02.010
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发表时间：
2015-10-01
影响因子：
1.9
通讯作者：
Schneider, C. M.
中科院分区：
文献类型：
--
作者：
Feyer, V.;Graus, M.;Schneider, C. M.
铜和银表面可以作为模型系统来研究有机分子吸附后的结构形成和界面结合。用LEED和光电子动量显微镜研究了TCNQ在Cu（0 0 1）和Ag（0 0 1）表面以及TCNQ+Mn在Ag（0 0 1）表面的有序单分子膜的几何结构和电子结构. TCNQ在Cu（0 0 1）上形成了一个不可替代的超结构，而在Ag（0 0 1）上则形成了两个依赖于覆盖率的可替代超结构.随后Mn在TCNQ/Ag（0 0 1）上的吸附导致形成长程有序的混合金属-有机超结构，其也可与Ag（0 0 1）基底结合。光电子能谱（PES）数据表明，在所有研究的界面上，TCNQ的LUMO都被来自衬底的电荷转移所填充，Mn的共吸附导致TCNQ的HOMO和LUMO相对于TCNQ/Ag（0 0 1）的能量移动为2 30 meV.利用PES中TCNQ LUMO的特征性角度依赖性强度图案来研究相应晶胞中分子的方位角取向。角分辨PES数据进行了进一步分析，以确定吸附层中的横向带色散效应，但没有观察到显着的色散。(C)2015 Elsevier B. V.版权所有。
Copper and silver surfaces can be used as model systems to study structure formation and interfacial bonding upon adsorption of organic molecules. We have investigated the geometric and electronic structure of ordered monolayers of TCNQ on Cu(0 0 1) and Ag(0 0 1) and of TCNQ+Mn on Ag(0 0 1) surfaces by LEED and photoelectron momentum microscopy. While TCNQ forms an incommensurable superstructure on Cu(0 0 1), two coverage-dependant, commensurable superstructures are established on Ag(0 0 1). Subsequent adsorption of Mn on top of TCNQ/Ag(0 0 1) results in the formation of a long-range ordered mixed metal-organic superstructure, which is also commensurable with the Ag(0 0 1) substrate. The photoelectron spectroscopy (PES) data shows a filling of the TCNQ LUMO by charge transfer from the substrate for all investigated interfaces and the coadsorption of Mn leads to an energy shift of the TCNQ HOMO and LUMO of 230 meV with respect to TCNQ/Ag(0 01). The characteristic angle-dependent intensity pattern of the TCNQ LUMO in PES was utilized to investigate the azimuthal orientation of the molecules in the respective unit cells. The angle-resolved PES data was further analyzed to identify lateral band dispersion effects in the adsorbate layers, but no significant dispersion was observed. (C) 2015 Elsevier B.V. All rights reserved.