Raman Optical Activity Spectroscopy
Raman Optical Activity Spectroscopy
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拉曼旋光光谱
DOI：
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
W. Hug
中科院分区：
文献类型：
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作者：
W. Hug
圆偏振光与拉曼散射中手性物质的非对映相互作用称为拉曼光学活性(ROA)。在其历史背景下，简要讨论了在传输中测量振动光学活性和通过散射测量振动光学活性的相对优点。选择散射几何和偏振方案的可能性可以提供传输实验中没有的信息，积分圆差散射截面相当于圆差消光系数。理论表达式被转换成一种形式，允许以图形表示在振动分子中产生拉曼和ROA强度的方式。结果表明，从头计算的ROA背向散射谱与测量的ROA背向散射谱有很好的一致性，适当地求和ROA强度是电子分布手性对ROA影响的量度。
关键词：
振动光学活性；
ROA的测量；
对居留权的解释；
电子手性的影响；
原子贡献模式
The diastereomeric interaction of circularly polarized light with chiral matter in Raman scattering is called Raman optical activity (ROA). The relative merits of measuring vibrational optical activity in transmission and by scattering are briefly discussed in their historic context. The possibility of choosing the scattering geometry and the polarization scheme can provide information not available from a transmission experiment, with the integral circular difference scattering cross sections the equivalent of circular difference extinction coefficients. The theoretical expressions are cast into a form which allows a graphical representation of the way in which Raman and ROA intensities are generated in a vibrating molecule. It is shown that excellent agreement between ab initio computed and measured ROA backscattering spectra is possible, and that appropriately summed ROA intensities are a measure of the influence the chirality of the electron distribution has on the ROA.
Keywords:
vibrational optical activity;
measurement of ROA;
interpretation of ROA;
influence of electronic chirality;
atomic contribution pattern