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题名: A Short-Wavelength Raman Optical Activity Spectrometer with Laser Source at 457nm for the Characterization of Chiral Molecules
作者: Zhang, Ying1;  Wang, Peng1, 2;  Jia, Guoqing1;  Cheng, Feng1;  Feng, Zhaochi1;  Li, Can1
关键词: Raman optical activity ;  ROA ;  short-wavelength laser ;  457nm ROA ;  enhanced ROA signal-to-noise ratio
刊名: APPLIED SPECTROSCOPY
发表日期: 2017-09-01
DOI: 10.1177/0003702817712260
卷: 71, 期:9, 页:2211-2217
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Technology
类目[WOS]: Instruments & Instrumentation ;  Spectroscopy
研究领域[WOS]: Instruments & Instrumentation ;  Spectroscopy
英文摘要: Developing a high-sensitivity Raman optical activity (ROA) spectrometer has been regarded as one of the great challenges in chiral science and technology. Herein, we report our recent progress on the development of a short-wavelength ROA (sw-ROA) spectrometer with the excitation line at 457nm, which shows obviously improved signal-to-noise (S/N) ratio compared with the currently available 532nm ROA spectrometer. This could be ascribed to the fifth-power of frequency dependence for ROA intensity together with the potential advantage of avoiding fluorescence for most molecules. The required laser power at the sample for being able to obtain a reliable ROA spectrum is less than 150 milliwatts (mW) for most samples. In the case of neat S--pinene sample, the ROA signal can be acquired with the laser power at sample as low as 5 mW with the total exposure time of 5min. The concentration of S--pinene sample can be reduced to 10% (v/v) by diluting with ethanol. These results demonstrate the great potential of sw-ROA (457nm) working with decreased laser power, shortened acquisition time, and lower sample concentration. The applicability of sw-ROA (457nm) has also been demonstrated by measuring representative chiral samples, including carbohydrates, amino acids, protein in aqueous solution, and chiral organic molecule in organic solvents.
关键词[WOS]: ACTIVITY SPECTROSCOPY ;  SCATTERING
语种: 英语
WOS记录号: WOS:000408851300016
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/149961
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian, Peoples R China
2.Univ Chinese Acad Sci, Beijing, Peoples R China

Recommended Citation:
Zhang, Ying,Wang, Peng,Jia, Guoqing,et al. A Short-Wavelength Raman Optical Activity Spectrometer with Laser Source at 457nm for the Characterization of Chiral Molecules[J]. APPLIED SPECTROSCOPY,2017,71(9):2211-2217.
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