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| 低浓度下二硫化碳中A的拉曼散射截面随浓度降低而变大这一异常现象，这是弱阻尼电子-核相干振动和弱阻尼电子耦合跃迁共振拉曼效应共同作用结果。随着浓度降低，A分子结构有序性增加产生弱阻尼相干振动是散射截面增大的主要原因。CS2是一种密度大的非极性分子。A在CS2中，随着浓度降低，A分子逐渐分散，是自身相互作用减少和消失。CS2密度大减少了各种外场因素引起的浮动，使A在CS2中各CC键受力均匀。CS2非极性静电作用使A的π电子离域扩展，分子结构有序性加强。不同浓度下紫外-可见光谱变窄，退偏比的变化都证明了这一事实。 |
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ouyangshunli(金币+20,VIP+0):谢谢你的帮助 2-16 08:44
ouyangshunli(金币+20,VIP+0):谢谢你的帮助 2-16 08:44
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At low concentration, carbon bisulfide displays an abnormal phenomenon that Raman scattering cross section of A increases with decreasing concentration, which is due to weakly damped electron-nuclear coherent vibration and weak electronic coupling damping resonance Raman effect transitions. As concentration is decreased, weak coherent vibration damping is produced by the increasing of order of A molecular structure. CS2 is a non-polar molecule with large density. A will be gradually dispersed in CS2 with the decrease of concentration, resulting in the decreasing and vanishing of self-interaction. The density of CS2 reduces the effect of external factors, and C-C bonding performs uniform forces on A. The nonpolarity electrostatic interaction of CS2 expands the n electronic delocalization of A, and strengths the order of the molecular structure. This fact can be proved by the narrow of UV-visible spectrum in various concentration and the change of depolarization ratio. |
2楼2009-02-15 20:30:43