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| With decreasing concentration, the number of CS2 molecules located at single β-carotene molecule increases relatively，so intermolecular interaction of β-carotene is weakened. In addition, the large density of CS2 reduces the purturbation of external environment, and the CC bonding of β-carotene is forced evenly, which induces further enhancement degree of structural order of β-carotene molecule. The lower the concentration is, the more rapid the enhancement in induced degree of structural order of β-carotene is. So electronic delocalization is enhanced in β-carotene chain by high degree of structural order of β-carotene[25]. Furthermore, this fact can be proved by two hands. With decreasing concentration, firstly, the UV-visible spectrum of β-carotene in CS2 progressively narrows, and secondly, the depolarization ratio of the CC stretching modes of β-carotene in CS2 becomes large in the Raman spectra. According to D.Yu.Paraschuk and Kobryanskii’s a qualitative nonlinear model of coherent weekly damped electron-lattice vibrations[4], the degree of delocalization of π electron is enhanced, so the density of mobile π electrons between adjacent carbon sites in the β-carotene chain strongly modulates the strength of their covalent bonding giving a high electron-phonon coupling, which results in the peculiar phenomenon that RSCS is extremely high. |
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ouyangshunli(金币+10,VIP+0): 9-17 12:54
ouyangshunli(金币+10,VIP+0): 9-17 12:54
| 以降低浓度,CS2分子位于单β-carotene分子间相互作用,所以相对增加的β-carotene减弱。此外,大的密度降低purturbation CS2版的外部环境和CC粘合β-carotene被迫均匀,导致进一步的提高程度β-carotene分子结构的顺序。较低的浓度,更迅速增强感应度β-carotene结构的。所以在β-carotene增强电子非内国化程度高,结构的β-carotene(25)。另外,这一事实可以证明,两只手。首先,以降低浓度、紫外光谱的β-carotene逐渐变窄,CS2版的极化率的模式的延伸β-carotene抄送成为大在CS2拉曼光谱。根据D.Yu.Paraschuk和Kobryanskii是一个定性模型的非线性阻尼振动的相干每周electron-lattice[4],非内国化程度的增强,所以π电子密度之间的移动π电子站点β-carotene相邻碳链强烈剌激强度的共价结合给人们提供了一种高electron-phonon耦合等因素的影响,导致了奇特的现象,构建极高。 |
2楼2009-09-17 08:09:12
jw227
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ouyangshunli(金币+10,VIP+0): 9-17 12:54
ouyangshunli(金币+10,VIP+0): 9-17 12:54
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随着浓度降低，在单一的β-胡萝卜素分子周围二硫化碳分子数目相对增加，所以β-胡萝卜素分子内作用降低。此外，大密度的二硫化碳减少外部环境的无序程度，并且β-胡萝卜素的碳碳键被迫平均化，这诱使β-胡萝卜素分子的结构有序性进一步提高。浓度越低，诱导β-胡萝卜素的结构有序性的作用越迅速，所以，β-胡萝卜素分子的结构有序性提高了β- 胡萝卜素支链中的电荷离域程度。而且，这一事实可以通过两方面证明。首先，随着浓度降低，β-胡萝卜素在二硫化碳中的紫外可见光谱谱宽逐步缩小，第二，β- 胡萝卜素在二硫化碳中碳碳键拉伸模式的极化率在拉曼光谱中变大。根据D.Yu.Paraschuk和 Kobryanskii的连贯周阻尼电子晶格振动？？？？？（coherent weekly damped electron-lattice vibrations??????）定量非线性模型，π电子离域化程度提高，β-胡萝卜素支链中相邻碳的游离π电子密度强烈调节其共价键的强度，造成很高的电声子耦合，导致RSCS极高的特殊现象 purturbation 应该是 perturbation |
3楼2009-09-17 09:20:14
