Exploring Resonance Raman Scattering with 4-Nitrophenol
Exploring Resonance Raman Scattering with 4-Nitrophenol
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DOI：
10.1021/acs.jchemed.2c00210
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发表时间：
2022-08
影响因子：
3
通讯作者：
C. L. Jahncke;Wen-Yi Zhang;Bethany M. DeMuynck;A. D. Hill
中科院分区：
文献类型：
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作者：
C. L. Jahncke;Wen-Yi Zhang;Bethany M. DeMuynck;A. D. Hill
拉曼散射是揭示分子振动的有力工具，但作为一种非线性光学现象，其信号可以通过红外光谱中没有直接类似物的共振增强等机制发生变化。在这项工作中，对4-硝基苯酚及其共轭碱进行的补充测量使学生能够直接控制负责增强的变量。通过添加二极管激光器改变样品的紫外-可见吸光度与pH值和激发颜色，学生可以探索共振拉曼散射的标准：只有共轭碱和405 nm激光相结合才能产生增强。对实验的调整使其适合于高级本科实验室或独立探究项目。
Raman scattering is a powerful tool for revealing the vibrations of molecules, but as a nonlinear optical phenomenon, its signals can change via mechanisms like resonance enhancement that have no direct analogue in infrared spectroscopy. In this work, complementary measurements conducted on 4-nitrophenol and its conjugate base allow students to directly control the variables responsible for enhancement. Changing sample UV–vis absorbance with pH and excitation color with the addition of a diode laser allows students to explore the criteria for resonance Raman scattering: only the conjugate base and 405 nm laser in combination produce enhancement. Adjustments to the experiment make it suitable for either an upper-level undergraduate course lab or an independent inquiry project.