发光学报, 2013, 34 (10): 1373, 网络出版: 2013-10-24  

溶剂极性对β胡萝卜素分子电子-声子耦合的影响

Effect of Solvent Polarity on The Electron-phonon Coupling Constants of β-carotene
作者单位
1 吉林大学 超硬材料国家重点实验室, 吉林 长春130012
2 吉林大学 物理学院, 吉林 长春130012
摘要
引用一种带有量纲的电子-声子相互作用常数, 很容易建立它与黄昆因子的关系式, 进而计算出类胡萝卜素分子每个碳碳振动模的电子-声子耦合常数。测量了β胡萝卜素分子在极性溶剂1, 2-二氯乙烷和非极性溶剂环己烷中20~60 ℃的温度范围内紫外-可见吸收光谱和共振拉曼光谱。结果表明, 在极性溶剂1, 2-二氯乙烷中,β胡萝卜素分子的碳碳键拉曼散射截面小,黄昆因子、电子-声子耦合数比非极性溶剂中大。为了解释这种现象, 我们引入线性多烯分子的两种模型, 即F A C Oliveria引入的有效共轭长度模型和D Yu Paraschuk提出的相干弱阻尼电子-晶格振动模型。
Abstract
The relation between electron-phonon coupling constants with dimension and Huang-Ryes factor is easily established as we reference the electron-phonon coupling constants. Then we work out every C-C bond vibration mode of electron-phonon coupling constants of carotenoid. The UV-Vis absorption and Raman spectra of β-carotene in polar 1,2-dicholoroethane and nonpolar cyclohexane were characterized at the temperature range from 20~60 ℃.The results showed that the Raman scattering cross-section for C—C bond of β-carotene in polar solvent 1,2-dicholoroethane is small, Huang-Ryes factor and electron-phonon coupling constants are larger than those in nonpolar solvent. The experiment phenomena were explained by Onsager solvent effects theory, effective conjugated length and coherent weakly damped electron-lattice vibration.

徐胜楠, 孙美娇, 孙尚, 刘天元, 朱坤博, 孙成林, 里佐威. 溶剂极性对β胡萝卜素分子电子-声子耦合的影响[J]. 发光学报, 2013, 34(10): 1373. XU Sheng-nan, SUN Mei-jiao, SUN Shang, LIU Tian-yuan, ZHU Kun-bo, SUN Cheng-lin, LI Zuo-wei. Effect of Solvent Polarity on The Electron-phonon Coupling Constants of β-carotene[J]. Chinese Journal of Luminescence, 2013, 34(10): 1373.

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