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Chemical Imaging of Surfaces with Sum Frequency Generation Vibrational Spectroscopy.
Accounts of Chemical Research ( IF 18.3 ) Pub Date : 2020-05-21 , DOI: 10.1021/acs.accounts.0c00057
Syed Alamdar Shah 1 , Steven Baldelli 1
Affiliation  

Surface chemistry is a key area of study in the chemical sciences, and many system properties are dominated by the chemistry at the interface between two bulk media. While the interface may have a large influence on the system behavior, there are relatively few molecules at the interface compared to the bulk; thus, probing their unique properties has become a specialized field in physical chemistry. In addition to the heterogeneous phase chemistry, surfaces also present spatial heterogeneity (Chemistry in Two Dimensions). This 2D chemistry affects the properties as much as the heterogeneous phases. If we consider the Cartesian z-axis as defining the dimension across the interface between the two bulk phases, then the xy plane is the 2D region of the surface. We might even consider that the majority of surface chemistry has been concerned with this z-dimension, i.e., surface structure, partition excess, thermodynamics, etc. relative to the bulk, where the 2D distribution was only considered on average. This treatment is understandable since few techniques provide the spatial and chemical resolution needed to deduce the effects of 2D heterogeneity on the surface properties. It is desirable to use an all-optical technique for interface studies because the optical methods provide the chemical specificity through spectroscopy. Also, the use of second-order spectroscopy is typically surface-sensitive without background subtractions or enhancement mechanisms that could limit the range of systems to be investigated.

中文翻译:

用和频生成振动光谱对表面进行化学成像。

表面化学是化学科学中的一个关键研究领域,许多系统特性都由两种体相介质之间的界面处的化学作用决定。尽管界面可能会对系统行为产生很大的影响,但与主体相比,界面处的分子相对较少。因此,探究它们的独特性质已成为物理化学的专业领域。除异相化学外,表面还具有空间异质性(二维化学)。这种2D化学作用对性能的影响与异相一样多。如果我们认为笛卡尔的z轴定义了两个本体相之间的界面尺寸,则xy平面是曲面的2D区域。我们甚至可能认为大多数表面化学都与z维有关,即相对于整体(二维分布仅被平均考虑)的表面结构,分配过量,热力学等。这种处理是可以理解的,因为很少有技术可以提供推断二维异质性对表面性能的影响所需的空间和化学分辨率。期望使用全光学技术进行界面研究,因为光学方法通过光谱学提供了化学特异性。同样,二阶光谱学的使用通常是表面敏感的,没有背景消减或增强机制,这可能会限制要研究的系统范围。
更新日期:2020-05-21
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