The observation of local structures of water-oil interfaces by fourth-order coherent Raman spectroscopy

在这项研究中，我们发展了四阶相干拉曼光谱和时间域红外-可见-可见和频产生，用于检测水-油界面等界面的分子结构。在研究过程中，得到了界面结构变化引起的晶格振动光谱、各种埋藏界面的分子振动光谱以及液-液界面二次谐波产生的强度变化。这些结果是观察化学反应过程中界面和中间结构的里程碑，这些界面和中间结构一直难以检测。

In this research, we have developped the fourth-order coherent Raman spectroscopy, and time-domain infrared-visible-visible sum-frequency generation for detection of molecular structures of interfaces such as water-oil interfaces. During the study, spectra of lattice vibrations, molecular vibrations of various buried interfaces, and intensity change of second-harmonic generation of liquid-liquid interfaces derived from the change of interfacial structures. These results are the milestones toward the observation of interfaces and intermediate structures during chemical reactions that have been difficult to detect.