Surface Action Spectroscopy: A Review and a Perspective on a New Technique to Study Vibrations at Surfaces,The Chemical Record

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Surface Action Spectroscopy: A Review and a Perspective on a New Technique to Study Vibrations at Surfaces
The Chemical Record ( IF 7.0 ) Pub Date : 2020-11-06 , DOI: 10.1002/tcr.202000111
Y Liu ₁ , Z Wu _{1,

2} , H Kuhlenbeck ₁ , H-J Freund ₁

Affiliation

A new vibrational spectroscopy method aimed at the investigation of solid surfaces in ultrahigh vacuum, called “Surface Action Spectroscopy (SAS)”, is described and the first results are reviewed. This technique is based on ideas and experiments performed in the gas phase. A surface is exposed to a messenger species at low temperature. This messenger species is desorbed via absorption of tunable infrared light from a free-electron laser and the desorption rate of the messenger species is recorded via mass spectrometry. It is shown that the technique is extremely surface sensitive and we discuss the basic mechanisms of the technique. We show a feasibility study on a V₂O₃(0001) surface, where we know the surface structure. We then proceed to the example of iron oxide films to study the surface structure in parallel with calculations of the surface phonons, which allow us to confirm the surface structure of Fe₃O₄(111) to be Fe_tet terminated. It also provides evidence for the so-called biphase structure. To conclude, we discuss possibilities to apply the technique to interesting questions in model and real catalysis, since the technique may provide interesting information independent of long-range order of the sample.

中文翻译：

表面作用光谱学：一种研究表面振动的新技术的回顾和展望

描述了一种新的振动光谱方法，旨在研究超高真空中的固体表面，称为“表面作用光谱 (SAS)”，并回顾了第一个结果。该技术基于在气相中进行的想法和实验。表面在低温下暴露于信使物种。这种信使物质通过吸收来自自由电子激光器的可调红外光而解吸，信使物质的解吸速率通过质谱法记录。它表明该技术对表面非常敏感，我们讨论了该技术的基本机制。我们展示了对 V ₂ O ₃的可行性研究(0001) 表面，我们知道表面结构。然后，我们继续以氧化铁膜为例，在计算表面声子的同时研究表面结构，这使我们能够确认 Fe ₃ O ₄ (111)的表面结构是 Fe _tet终止的。它还为所谓的双相结构提供了证据。总之，我们讨论了将该技术应用于模型和实际催化中有趣问题的可能性，因为该技术可以提供独立于样本的长程顺序的有趣信息。

更新日期：2020-11-06

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