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Diffuse Reflectance-Based Femtosecond Stimulated Raman Spectroscopy of Opaque Suspensions
Analytical Chemistry ( IF 6.7 ) Pub Date : 2023-10-18 , DOI: 10.1021/acs.analchem.3c02491
Steven A Diaz 1 , David W McCamant 1
Affiliation  

By augmentation of the collection optics utilized in transmission-based femtosecond stimulated Raman spectroscopy (FSRS), two novel diffuse reflectance-based femtosecond stimulated Raman spectroscopy (drFSRS) techniques were developed. These techniques were then used to collect the Raman spectra of opaque systems, those being cyclohexane-intercalated poly(tetrafluoroethylene) microbeads and ethanol in 1% intralipid solutions. The resulting drFSRS data from the cyclohexane:PTFE system show significant distortion of the depolarization ratio of the 803 cm–1 cyclohexane peak, indicating a loss of incident pump:probe polarization in a scattering environment. The drFSRS data from the ethanol in 1% intralipid solution demonstrate less signal strength but equal spectral resolution when compared to transmission-based FSRS of the same sample. The results presented in this Technical Note demonstrate the current capabilities of collecting stimulated Raman spectra of opaque systems using drFSRS.

中文翻译:

基于漫反射的不透明悬浮液飞秒受激拉曼光谱

通过增强基于透射的飞秒受激拉曼光谱 (FSRS) 中使用的收集光学器件,开发了两种新型的基于漫反射的飞秒受激拉曼光谱 (drFSRS) 技术。然后使用这些技术收集不透明系统的拉曼光谱,这些系统是环己烷嵌入的聚四氟乙烯微珠和乙醇在 1% 脂肪乳溶液中的溶液。环己烷:PTFE 系统所得的 drFSRS 数据显示 803 cm –1环己烷峰的去偏振比显着失真,表明散射环境中入射泵:探头偏振的损失。与同一样品的基于传输的 FSRS 相比,1% 脂肪乳溶液中的乙醇的 drFSRS 数据显示信号强度较低,但光谱分辨率相同。本技术说明中提供的结果证明了当前使用 drFSRS 收集不透明系统受激拉曼光谱的能力。
更新日期:2023-10-18
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