1 Laboratory of Environmental Science and Technology, Xinjiang Technical Institute of Physics & Chemistry; Key Laboratory of Functional Materials and Devices for Special Environments, 74610 Chinese Academy of Sciences, Urumqi , China.
2 74610 University of Chinese Academy of Sciences, Beijing, China.
Appl Spectrosc. 2018 Jan;72(1):122-128. doi: 10.1177/0003702817742053. Epub 2017 Nov 15.
We present a novel ultrahigh vacuum (UHV) compatible polarization modulation infrared reflection absorption spectroscopy (PM-IRRAS) system that is designed for in situ surface spectroscopic characterization on a transferable single crystalline sample. The innovative design of manipulator rod and high-pressure cell (HPC) ensures free movement of the sample between the preparation chamber and the HPC, and perfect separation of them during high pressure experiments. The pressure in the HPC can be varied from UHV (10 mbar) to ambient pressure (1000 mbar) while keeping the preparation chamber under UHV conditions. The design of the transferable sample holder and receiving stage allows precise temperature measurement and allows convenient sample changing. In situ IRRAS measurements under variable pressure and temperature can be conducted either in the conventional mode or with polarization modulation. Other surface characterization methods can also use the preparation chamber; thus, the system is endowed with the capability for systematic investigations of surface catalytic reactions. A case study of CO adsorption and oxidation on Pt(111) demonstrates the performance of the system.
我们提出了一种新颖的超高真空 (UHV) 兼容的极化调制红外反射吸收光谱 (PM-IRRAS) 系统，旨在对可转移单晶样品进行原位表面光谱特性研究。操纵杆和高压腔 (HPC) 的创新设计确保了样品在制备腔和 HPC 之间的自由移动，并且在高压实验期间它们之间可以完美分离。HPC 中的压力可以从 UHV（10 mbar）变化到环境压力（1000 mbar），而制备腔保持在 UHV 条件下。可转移样品架和接收台的设计允许精确的温度测量，并方便样品更换。在可变压力和温度下进行原位 IRRAS 测量，可以采用传统模式或极化调制模式。其他表面特性研究方法也可以使用制备腔，因此，该系统具有进行系统的表面催化反应研究的能力。CO 在 Pt(111)上的吸附和氧化的案例研究展示了该系统的性能。
