Surface chemistry is notoriously difficult to study, in part, due to the decreased number of molecules that contribute to the properties compared to the bulk phase but often has significant effects on the chemical activity of the material. This is especially true in topics such as corrosion, catalysis, wetting, and many others in nature and industry. Sum frequency generation (SFG) spectroscopy was developed for interface studies due to its high molecular selectivity and surface sensitivity, which is quite useful to study the effects of structural inhomogeneity in microscopy. Compressive sensing (CS) combined with SFG spectroscopy minimizes the imaging time while still producing quality images. Selected systems are presented here to demonstrate the capability of CS-SFG microscopy. CS-SFG microscopy successfully distinguished the static monolayer molecular mixtures, the orientations and adsorption of adsorbed molecules by the dip-coating technique, and the localized CO behaviors on polycrystalline Pt electrodes. Further discussion includes dynamic imaging as a future direction in CS-SFG microscopy. As materials and surfaces become more complex, imaging with chemical contrast becomes indispensable to understanding their performance and CS-SFG microscopy seems highly beneficial in this respect.

中文翻译：

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表面光谱成像—和频产生显微镜（SFGM）结合压缩感测（CS）技术

众所周知，表面化学很难研究，部分原因是与本体相相比，减少了对特性有贡献的分子数量，但通常会对材料的化学活性产生重大影响。在诸如腐蚀，催化，润湿以及自然界和工业界的许多其他主题中尤其如此。总和频率生成（SFG）光谱技术因其高的分子选择性和表面敏感性而被开发用于界面研究，对于研究显微镜中结构不均匀性的影响非常有用。压缩传感（CS）与SFG光谱技术相结合，可将成像时间减至最少，同时仍可产生高质量的图像。此处介绍了一些选定的系统，以证明CS-SFG显微镜的功能。CS-SFG显微镜通过浸涂技术成功地区分了静态单层分子混合物，吸附分子的方向和吸附以及多晶Pt电极上的局部CO行为。进一步的讨论包括将动态成像作为CS-SFG显微镜的未来方向。随着材料和表面变得越来越复杂，化学对比度成像对于理解其性能变得必不可少，而CS-SFG显微镜在这方面似乎非常有益。