| 光谱学与光谱分析 |
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| Study on the Turning Effect of the Energy Gap of π Electron on Atomic Vibration in Conjugated Linear Polymer |
| HE Xin2, 4, SUN Mei-jiao1, 2, LI Shuo2, GAO Shu-qin2, SUN Cheng-lin2, LI Zuo-wei1, 2, HE Zhi1, SONG Wen-zhi3* |
1. State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China
2. College of Physics, Jilin University, Changchun 130012, China
3. China-Japan Union Hospital，Jilin University，Changchun 130031，China
4. Material Science and Technology College, Jilin University, Changchun 130012, China |
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Abstract The Visible absorption and Raman spectra of β-carotene were measured in dimethyl sulfoxide in temperature ranging from 81 to 25 ℃ and in carbon disulfide in pressure range from 0.04 to 0.60 GPa, respectively. The results indicated that the visible absorption and Raman spectra are both red-shifted, Raman scattering cross section increase with the temperature decreasing. And with the pressure increasing, the visible absorption spectra are red-shifted, but the frequency shift towards higher frequencies in the Raman spectra, the Raman scattering cross section decrease unexpectedly. The latter can’t be explained by the model of “effective conjugation length” and “coherent weakly damped electron-lattice vibrations”. In this paper, we combined electron-vibration coupling rule with theoretical calculations and found that the electron-phonon coupling constant had a certain changing trend with the temperature and pressure variation, which Indicate that the interaction between π-electron and CC bond vibration was essential for this experiment result. Thus, the turning effect of energy gap of the π on CC vibration mode is responsible for such phenomenon.
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Received: 2015-04-14
Accepted: 2015-08-16
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Corresponding Authors:
SONG Wen-zhi
E-mail: songwz@jlu.edu.cn
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| [1] |
GONG Nan1, CAO Xian-wen1, SUN Cheng-lin1, FANG Wen-hui3, YUAN Ju-hui2, GAO Shu-qin1, LI Zuo-wei1, CHEN Wei2*, FU Hao-yang1*. Effects of External Fields on CC Atomic Vibrations Modulated by Electron Band Gap[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2018, 38(08): 2462-2467. |
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ZHANG Xue2, SUN Mei-jiao2, LI Shuo2, LIU Tie-cheng1, 2*, SUN Cheng-lin1, 2, LI Zuo-wei2 . Resonance Raman Spectra of Linear Polymer Molecule [J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2014, 34(05): 1275-1278. |
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