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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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pan0827
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doudounba(金币+1,VIP+0):感谢你对我求助的关心，以前有一段文章您帮改的很好，从你的态度你也很是对小木虫更是关心负责，你的疑问，我已在下面说明！ 9-19 14:41
doudounba(金币+1,VIP+0):感谢你对我求助的关心，以前有一段文章您帮改的很好，从你的态度你也很是对小木虫更是关心负责，你的疑问，我已在下面说明！ 9-19 14:41
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doudounba(金币+15,VIP+0): 9-18 15:48
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| The number of CS2 molecules located at single β-carotene molecule increases with decrease in concentration, and thus the intermolecular interaction of β-carotene is weakened. In addition, the large density of CS2 prevents the purturbation of external environment, and the CC bonding of β-carotene is forced evenly, which could cause further improvement of structural order of β-carotene molecule. The lower the concentration is, the larger the enhancement is. Therefore, the electronic delocalization is enhanced in β-carotene chain by high degree of structural order of β-carotene[25]. This fact can be proved by two hands. Firstly, with decreasing concentration, the UV-visible spectrum of β-carotene in CS2 progressively becomes narrow. Secondly, the depolarization ratio of the CC stretching modes of β-carotene in CS2 becomes larger in the Raman spectra. According to the previous report by D.Yu.Paraschuk and Kobryanskii, 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. |
4楼2009-09-17 18:48:43
5楼2009-09-18 10:34:37
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