光谱学与光谱分析 |
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Effect of Pressure on Electron-Phonon Coupling Constants of All-Trans-β-Carotene |
SUN Mei-jiao1,2, WANG Kai1, XU Sheng-nan2, QU Guan-nan2, LI Shuo2, SUN Cheng-lin2, ZHOU Mi2*, LI Zuo-wei2 |
1. State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China 2. College of Physics, Jilin University, Changchun 130012, China |
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Abstract The present paper cited that R.Tubino and other people introduced a kind of electron-phonon coupling constants with dimension, which can establish the relation with the Huang-Rhys factor and calculate the electron-phonon coupling constants of every C—C bond vibration mode. There are many reports about the visible absorption and Raman spectra of all-trans-β-carotene with pressure. But the study about the Raman scattering cross section and the Huang-Rhys factor with pressure have not been reported now. Visible absorption and Raman spectra of all-trans-β-carotene were measured in carbon disulfide in the pressure range from 0.04 to 0.60 GPa. The results indicated that the visible absorption spectra of β-carotene in nonpolar solvent carbon disulfide are red-shifted with pressure increasing, but the frequency shifts towards higher frequencies in the Raman spectra, the Raman scattering cross section decreases, Huang-Rhys factor increases, and the electron-phonon coupling constants of CC bond vibration modes increase. The mechanism is that all-trans-β-carotene caused by compression and a decrease in the structurally ordered properties of the molecules leads to narrow energy gap of the π, shortens effective conjugation length, hinders delocalization of π-electron, decreases the Raman scattering cross section, and increases the Huang-Rhys factor and the electron-phonon coupling constants.
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Received: 2013-05-13
Accepted: 2013-08-26
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Corresponding Authors:
ZHOU Mi
E-mail: mzhou@jlu.edu.cn
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