Dual analyzer system for surface analysis dedicated for angle-resolved photoelectron spectroscopy at liquid surfaces and interfaces.
Dual analyzer system for surface analysis dedicated for angle-resolved photoelectron spectroscopy at liquid surfaces and interfaces.
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DOI：
10.1063/1.4942943
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发表时间：
2016-04
期刊：
影响因子：
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通讯作者：
Inga Niedermaier;C. Kolbeck;H. Steinrück;F. Maier
中科院分区：
文献类型：
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作者：
Inga Niedermaier;C. Kolbeck;H. Steinrück;F. Maier
利用基于超高真空（UHV）的表面科学技术的强大工具箱对液体表面和界面的研究通常必须克服真空系统内的液体蒸发问题。然而，在过去的十年中，在室温下蒸汽压可以忽略不计的新型液体，特别是离子液体（IL），已经出现了表面科学研究。已经证明，特别是角分辨X射线光电子能谱（ARXPS）允许在分子水平上研究发生在气-液和液-固界面的现象。结果不仅与IL系统相关，而且与一般液体相关。在所有这些先前的ARXPS研究中，样品保持器必须倾斜以改变发射的光电子的极性检测角，这将液体系统限制为涂覆平坦固体载体的非常薄的粘性IL膜。我们现在报告的概念和实现的一个新的和独特的实验室“双分析仪系统表面分析（DASSA）”，使快速ARXPS，紫外光电子能谱，XPS成像，和低能量离子散射在水平面上的宏观厚的非挥发性液体样品。它包括一个UHV室，配备有两个电子分析仪，用于同时测量相对于表面法线的0°和80°发射。DASSA的性能上的第一个宏观液体系统将被证明。
The investigation of liquid surfaces and interfaces with the powerful toolbox of ultra-high vacuum (UHV)-based surface science techniques generally has to overcome the issue of liquid evaporation within the vacuum system. In the last decade, however, new classes of liquids with negligible vapor pressure at room temperature-in particular, ionic liquids (ILs)-have emerged for surface science studies. It has been demonstrated that particularly angle-resolved X-ray Photoelectron Spectroscopy (ARXPS) allows for investigating phenomena that occur at gas-liquid and liquid-solid interfaces on the molecular level. The results are not only relevant for IL systems but also for liquids in general. In all of these previous ARXPS studies, the sample holder had to be tilted in order to change the polar detection angle of emitted photoelectrons, which restricted the liquid systems to very thin viscous IL films coating a flat solid support. We now report on the concept and realization of a new and unique laboratory "Dual Analyzer System for Surface Analysis (DASSA)" which enables fast ARXPS, UV photoelectron spectroscopy, imaging XPS, and low-energy ion scattering at the horizontal surface plane of macroscopically thick non-volatile liquid samples. It comprises a UHV chamber equipped with two electron analyzers mounted for simultaneous measurements in 0° and 80° emission relative to the surface normal. The performance of DASSA on a first macroscopic liquid system will be demonstrated.