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Influence of pressure effect on Fermi resonance in binary solution |
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)† |
a State Laboratory of Superhard Materials, Jilin University, Changchun 130021, China; b School of Science, Qingdao Technological University, Qingdao 266033, China; c College of Physics, Jilin University, Changchun 130021, China |
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Abstract 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.
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Received: 17 February 2010
Revised: 11 March 2010
Accepted manuscript online:
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PACS:
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61.25.Em
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(Molecular liquids)
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62.50.-p
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(High-pressure effects in solids and liquids)
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78.30.Cp
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Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 10774057 and 10974067). |
Cite this article:
Jiang Xiu-Lan(蒋秀兰), Yang Guang(杨光), Li Dong-Fei(李东飞), Zhou Mi(周密), Sun Cheng-Lin(孙成林), Gao Shu-Qin(高淑琴), and Li Zuo-Wei(里佐威) Influence of pressure effect on Fermi resonance in binary solution 2010 Chin. Phys. B 19 103301
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