Hyper-Raman optical activity of biologically relevant chiral molecules

Hyper-Raman optical activity of biologically relevant chiral molecules
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生物相关手性分子的超拉曼光学活性

DOI:
10.1117/12.2545530
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发表时间:
2020
期刊:
Hyper-Raman optical activity of biologically relevant chiral molecules
影响因子:
--
通讯作者:
Khodaparast, Giti A.
Khodaparast, Giti A.
中科院分区:
--
文献类型:
--
作者:
Marble, Christopher B.;Xu, Xingqi;Keppler, Mark A.;Gil, Eddie M.;Petrov, Georgi I.;Wang, Dawei;Yakovlev, Vladislav V.;Razeghi, Manijeh;Lewis, Jay S.;Khodaparast, Giti A.

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拉曼散射的光学活性提供了对手性分子的绝对构型和构象的深入了解。拉曼旋光性(罗阿)的应用受到长积分时间的限制,这是由于散射光对手性的灵敏度相对较低(通常为10- 3至10-5)。我们应用罗阿技术超拉曼散射使用入射圆偏振光和直角散射几何。我们探讨的灵敏度超拉曼散射手性相比,自发拉曼光学活性。使用在532 nm附近的激发波长,光漂白被最小化,而超拉曼散射受益于电子共振增强。对于S/R-2-丁醇和L/D-酒石酸,我们无法在1%的灵敏度水平下检测到超拉曼光学活性。我们还探讨了寄生热效应,这可以通过改变用于激发超拉曼散射的激光源的重复率来减轻。
The optical activity of Raman scattering provides insight into the absolute configuration and conformation of chiral molecules. Applications of Raman optical activity (ROA) are limited by long integration times due to a relatively low sensitivity of the scattered light to chirality (typically 10-3to 10-5). We apply ROA techniques to hyper-Raman scattering using incident circularly polarized light and a right-angle scattering geometry. We explore the sensitivity of hyper- Raman scattering to chirality as compared to spontaneous Raman optical activity. Using the excitation wavelength at around 532 nm, the photobleaching is minimized, while the hyper-Raman scattering benefits from the electronic resonant enhancement. For S/R-2-butanol and L/D-tartaric acid, we were unable to detect the hyper-Raman optical activity at the sensitivity level of 1%. We also explored parasitic thermal effects which can be mitigating by varying the repetition rate of the laser source used for excitation of hyper-Raman scattering.
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