Step-type and step-density influences on CO adsorption probed by reflection absorption infrared spectroscopy using a curved Pt(1 1 1) surface
Step-type and step-density influences on CO adsorption probed by reflection absorption infrared spectroscopy using a curved Pt(1 1 1) surface
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利用弯曲 Pt(1 1 1) 表面反射吸收红外光谱探测阶梯类型和阶梯密度对 CO 吸附的影响
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
L. Juurlink
中科院分区：
文献类型：
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作者：
A. Walsh;Richard Lent;Sabine V. Auras;M. Gleeson;O. Berg;L. Juurlink
与平面单晶相比，弯曲晶体提供的连续变化的结构为研究表面的物理和化学过程提供了许多有利条件。然而，曲面的曲率也带来了实验挑战。特别是对于红外光谱，通常用掠入射反射吸收红外光谱(RAIRS)来探测金属样品上的吸附。在这个几何学中，凸晶充当一个强发散的镜子。作者描述了如何为RAIRS解决由圆柱面引入的实验困难。一个互补的镜子，直接放置在真空室内弯曲晶体的下场，最大限度地减少了样品产生的发散。通过简单地将红外焦点移过样品，作者以高灵敏度和空间分辨率探测作为局部阶跃类型和阶跃密度的函数的吸附振动光谱。耗时的样本交换和同伴..。
In comparison to flat single crystals, the continuous variation of structure provided by curved crystals offers many benefits for the study of physical and chemical processes at surfaces. However, the curvature of the surface also creates experimental challenges. For infrared spectroscopy, in particular, adsorbates on metal samples are typically probed by grazing-incidence reflection-absorption infrared spectroscopy (RAIRS). In this geometry, a convex crystal acts as a strongly diverging mirror. The authors describe how the experimental difficulties introduced by a cylindrical surface can be resolved for RAIRS. A complementary mirror, placed directly downfield of the curved crystal within the vacuum chamber, minimizes the divergence created by the sample. By simply translating the infrared focus across the sample, the authors probe adsorbate vibrational spectra as a function of local step-type and step-density with high sensitivity and spatial resolution. Time-consuming sample exchange, and the concomitan...