Near-Infrared Excited Raman Optical Activity
Near-Infrared Excited Raman Optical Activity
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近红外激发拉曼光学活性
DOI：
10.1366/000370207782217752
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发表时间：
2007
影响因子：
3.5
通讯作者：
N. Halas
中科院分区：
文献类型：
--
作者：
L. Nafie;B. Brinson;Xiao;D. A. Rice;O. M. Rahim;R. Dukor;N. Halas
采用780 nm激光激发，测量了S-（-）-α-蒎烯和L-丙氨酰-L-丙氨酸的近红外散射圆偏振拉曼旋光（SCP-ROA）。这是在488和532 nm之间的蓝色到绿色可见光区域之外的罗阿的第一次测量。在532和780 nm激发下测量的拉曼和ROA强度的比较表明，观察到预期的频率对拉曼散射的四次方依赖性和相应的罗阿的五次方依赖性。可以得出结论，在该频率依赖性内，使用具有532 nm激发的商业仪器的拉曼和罗阿测量的相同水平的效率随着改变为780 nm处的近红外激发而保持。
Measurements of near-infrared scattered circular polarization Raman optical activity (SCP-ROA) are presented using laser excitation at 780 nm for samples of S-(—)-α-pinene and L-alanyl-L-alanine. These are the first measurements of ROA outside the blue-to-green visible region between 488 and 532 nm. Comparison of Raman and ROA intensities measured with excitation at 532 and 780 nm demonstrate that the expected frequency to the fourth-power dependence for Raman scattering and the corresponding fifth-power dependence for ROA are observed. It can be concluded that, to within this frequency dependence, the same level of efficiency of Raman and ROA measurements using commercial instrumentation with 532 nm excitation is maintained with the change to near-infrared excitation at 780 nm.