中国物理B ›› 2010, Vol. 19 ›› Issue (10): 103301-103301.doi: 10.1088/1674-1056/19/10/103301
李东飞1, 孙成林1, 周密2, 杨光3, 高淑琴3, 里佐威3, 蒋秀兰4
Jiang Xiu-Lan(蒋秀兰)a)b), Yang Guang(杨光)a)c), Li Dong-Fei(李东飞)c), Zhou Mi(周密)a), Sun Cheng-Lin(孙成林)c), Gao Shu-Qin(高淑琴) a)c), and Li Zuo-Wei(里佐威)a)c)†
摘要: The Fermi resonance behaviours of the two groups of binary solutions --- pyridine and methanol, benzene and carbon tetrachloride, under different pressures are investigated according to their Raman spectra. The effect of pressure on Fermi resonance in binary solution differs significantly from that in pure liquid. In a binary solution, with the intermolecular distance shortening, the intermolecular interaction potential increases, the shift rates of the Raman spectral lines increase, the spectral line splitting occurs ahead of that in pure liquid, and the wavenumber separation Δ0 between the unperturbed harmonic levels shifts more quickly, too. The Fermi resonance parameters, the coupling coefficient W and the intensity ratio R of the two Raman bands, decrease rapidly with pressure increasing, and the pressure at which Fermi resonance phenomenon disappears is much lower than that in pure liquid, especially in the solution whose molecules are of the same polarity. This article is valuable in the identification and the assignment of spectral lines under high pressure, as well as the study of high pressure effect, intermolecular interaction, and solvent effects in different cases, etc.
中图分类号: (Molecular liquids)