| 高压拉曼光谱方法研究联苯分子费米共振 |
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| 引用本文： | 周密,李占龙,陆国会,李东飞,孙成林,高淑琴,里佐威.高压拉曼光谱方法研究联苯分子费米共振[J].物理学报,2011,60(5):50702-050702. |
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| 作者姓名： | 周密 李占龙 陆国会 李东飞 孙成林 高淑琴 里佐威 |
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| 作者单位： | 超硬材料国家重点实验室,物理学院,吉林大学,长春 130012 |
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| 基金项目： | 国家自然科学基金(批准号:10974067),吉林省科技厅项目(批准号:20090534, 20101508),吉林大学科学前沿与交叉学科创新项目(批准号: 200903322), 吉林大学青年教师创新项目(批准号:201001007),吉林大学研究生创新基金(批准号: 20101055)资助的课题. |
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| 摘 要： | 测量了0—15 GPa压强下联苯分子的拉曼光谱. 结果表明,随压强增加,分子内和分子间π-π共轭和离域效应增强,谱线的绝对强度变大、蓝移. 联苯分子的两费米共振谱线强度比Rf/a减少,频率差Δ增加,当压强为8 GPa时,费米共振现象消失,利用Betran理论得出了固有频率差Δ0和耦合系数ω随压强的变化关系,通过高压下相变进行了解释,并探讨了高压下费米共振耦合变弱的机理.
关键词：
联苯
费米共振
高压
拉曼光谱
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| 关 键 词： | 联苯 费米共振 高压 拉曼光谱 |
| 收稿时间： | 2010-07-23 |
| 修稿时间： | 8/1/2010 12:00:00 AM |
High pressure Raman investigation on the Fermi resonance of biphenyl |
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| Zhou Mi,Li Zhan-Long,Lu Guo-Hui,Li Dong-Fei,Sun Cheng-Lin,Gao Shu-Qin,Li Zuo-Wei.High pressure Raman investigation on the Fermi resonance of biphenyl[J].Acta Physica Sinica,2011,60(5):50702-050702. |
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| Authors: | Zhou Mi Li Zhan-Long Lu Guo-Hui Li Dong-Fei Sun Cheng-Lin Gao Shu-Qin Li Zuo-Wei |
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| Affiliation: | State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China;State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China;State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China;State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China;State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China;State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China;State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China |
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| Abstract: | Raman spectra of biphenyl have been obtained under pressures up to 15 GPa. The results indicated that with the increase of pressure, the effect of inter- and intra-molecular π-πconjugation and delocation increases, accompanied by the intensity enhancement of the Raman bands, and blue shift of the frequency. The intensity ratio (Rf/a) of two Fermi resonance bands υ'6 + υ' 1 and υ' 8 decreases, and the frequency difference Δ increases with the pressure. The Fermi resonance phenomenon disappears when the pressure goos up to 8 GPa. Using J.F. Bertran's theory, we obtained the relationship of the inherent frequency difference Δ0 and coupling coefficient ω with pressure. This phenomenon was explained by high-pressure phase transition. The mechanism of high pressure induced Fermi resonance weakening was also discussed. |
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| Keywords: | biphenyl Fermi resonance high pressure Raman spectroscopy |
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