Vibrational Raman optical activity in forward scattering: Trans‐pinane and β‐pinene
Vibrational Raman optical activity in forward scattering: Trans‐pinane and β‐pinene
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前向散射中的振动拉曼光学活性：反式蒎烯和β-蒎烯
DOI：
10.1002/jrs.1250210609
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发表时间：
1990
影响因子：
2.5
通讯作者：
W. Hug
中科院分区：
文献类型：
--
作者：
L. Barron;L. Hecht;A. Gargaro;W. Hug
振动拉曼旋光性（罗阿）的第一次测量已经进行了采用前向散射几何。第一个例子是（+）-反式-蒎烷和（-）-β-蒎烯的前向散射罗阿光谱。与相应的后向和直角散射光谱的比较证实了罗阿的键极化率理论是一个很好的近似的反式-蒎烷，并明确确定了一个大的各向同性贡献的罗阿β-蒎烯带在716和765 cm−1归因于烯烃亚甲基扭曲和一个骨架模式的蒎烷结构之间的相互作用。除非存在大的各向同性贡献，这是不寻常的，前向散射是迄今为止最不利的罗阿测量策略，这可以解释最近试图观察相干反斯托克斯拉曼散射中的罗阿的失败。
The first measurements of vibrational Raman optical activity (ROA) have been performed employing a forward scattering geometry. Forward-scattered ROA spectra of (+)-trans-pinane and (−)-β-pinene are presented as first examples. Comparison with the corresponding backward-and right-angle-scattered spectra confirmed that the bond polarizability theory of ROA is a good approximation for trans-pinane, and has identified unequivocally a large isotropic contribution to the ROA in β-pinene bands at 716 and 765 cm−1 ascribed to interactions between the olefinic methylene twist and a skeletal mode of the pinane structure. Unless large isotropic contributions are present, which is unusual, forward scattering is by far the least favourable of the ROA measurement strategies, which might explain the failure of recent attempts to observe ROA in coherent anti-Stokes Raman scattering.