Wang Y, Glenz A, Muhler M, Wöll Ch
Lehrstuhl für Physikalische Chemie I, Ruhr-Universität Bochum, 44780 Bochum, Germany.
Rev Sci Instrum. 2009 Nov;80(11):113108. doi: 10.1063/1.3257677.
A newly designed ultrahigh vacuum (UHV) infrared spectroscopy apparatus dedicated to the spectroscopic characterization of oxides, singles crystals as well as powders, is described. It combines a state-of-the-art vacuum Fourier transform infrared (FTIR) spectrometer (Bruker, VERTEX 80v) with a novel UHV system (PREVAC) consisting of load-lock, distribution, measurement, and magazine chambers. The innovative design allows carrying out both reflection-absorption IR spectroscopy experiments at grazing incidence on well-defined oxide single crystal surfaces and FTIR transmission measurements for powder particles. A further unique feature of the apparatus is the entirely evacuated optical path to avoid background signals from gas phase H(2)O, CO(2), and other species, thus creating the possibility to record high-quality IR data with high sensitivity and stability, an essential prerequisite for monitoring molecular species adsorbed on oxide single-crystal surfaces. The unique performance of this new apparatus with regard to the spectroscopic characterization of adsorbates on oxide single crystals as well as on powder particles is demonstrated by case studies for two different materials, TiO(2) and ZnO.
本文描述了一种新设计的超高真空（UHV）红外光谱仪，该仪器专门用于氧化物、单晶以及粉末的光谱表征。它将一台先进的真空傅里叶变换红外（FTIR）光谱仪（布鲁克，VERTEX 80v）与一个新型的超高真空系统（PREVAC）相结合，该系统由气闸室、分配室、测量室和样品库室组成。这种创新设计使得既能在掠入射角下对清晰定义的氧化物单晶表面进行反射吸收红外光谱实验，又能对粉末颗粒进行傅里叶变换红外透射测量。该仪器的另一个独特之处在于其光路完全真空，以避免来自气相H₂O、CO₂和其他物质的背景信号，从而有可能以高灵敏度和稳定性记录高质量的红外数据，这是监测吸附在氧化物单晶表面的分子物种的必要前提。通过对两种不同材料TiO₂和ZnO的案例研究，展示了这种新仪器在氧化物单晶以及粉末颗粒上吸附物光谱表征方面的独特性能。
