Difference in effect of temperature on absorption and Raman spectra between all-trans-β-carotene and

• 作 者: 曲冠男 李硕 孙成林 刘天元 吴咏玲 孙尚 单肖宁 门志伟 陈伟 里佐威 高淑琴
• 机 构: College of Physics,Jilin University,State Key Laboratory of Superhard Materials,College of Physics,J
• 出 处: Chinese Physics B
• 发表日期: 2012年12期
• 关键词: carotene phonon coherent conjugated sulfoxide extremely explained decreasing vis

Temperature dependencies(81℃-18℃) of visible absorption and Raman spectra of all-trans-β-carotene and all-trans-retinol extremely diluted in dimethyl sulfoxide are investigated in order to clarify temperature effects on different polyenes.Their absorption spectra are identified to be redshifted with temperature decreasing.Moreover, all-trans-β-carotene is more sensitive to temperature due to the presence of a longer length of conjugated system.The characteristic energy responsible for the conformational changes in all-trans-β-carotene is smaller than that in all-transretinol. Both of the Raman scattering cross sections increase with temperature decreasing.The results are explained with electron-phonon coupling theory and coherent weakly damped electron-lattice vibrations model.

Temperature dependencies (81 ° C-18 ° C) of visible absorption and Raman spectra of all-trans-β-carotene and all-trans-retinol extremely diluted in dimethyl sulfoxide are investigated in order to clarify temperature effects on different polyenes. Their absorption spectra are identified to be redshifted with temperature decreasing. More-all-trans-β-carotene is more sensitive to temperature due to the presence of a longer length of conjugated system. The characteristic energy responsible for the conformational changes in all-trans-β-carotene Both smaller than that in all-transretinol. Both of the Raman scattering cross sections increase with temperature decreasing. The results were explained with electron-phonon coupling theory and coherent weakly damped electron-lattice vibrations model.