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1. 吉林大学 物理学院, 吉林 长春 130012
2. 吉林大学 超硬材料国家重点实验室, 吉林 长春 130012
收稿日期:2013-06-17,
修回日期:2013-07-16,
纸质出版日期:2013-10-10
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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): 1373-1379
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): 1373-1379
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): 1373-1379 DOI: 10.3788/fgxb20133410.1373.
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): 1373-1379 DOI: 10.3788/fgxb20133410.1373.
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
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。
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 -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 CC bond of -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.
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