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高压拉曼光谱方法研究联苯分子费米共振

High pressure Raman investigation on the Fermi resonance of biphenyl

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【作者】 周密李占龙陆国会李东飞孙成林高淑琴里佐威

【Author】 Zhou Mi Li Zhan-Long Lu Guo-Hui Li Dong-Fei Sun Cheng-Lin Gao Shu-Qin Li Zuo-Wei(State Key Laboratory of Superhard Materials,College of Physics,Jilin University,Changchun 130012,China)

【机构】 超硬材料国家重点实验室物理学院吉林大学

【摘要】 测量了0—15GPa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8GPa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.

【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.

【关键词】 联苯费米共振高压拉曼光谱
【Key words】 biphenylFermi resonancehigh pressureRaman spectroscopy
【基金】 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~~
  • 【文献出处】 物理学报 ,Acta Physica Sinica , 编辑部邮箱 ,2011年05期
  • 【分类号】O561.3
  • 【被引频次】3
  • 【下载频次】184
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