| 光谱学与光谱分析 |
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| Study of Fermi Resonance Characteristic of CS2 in THF |
| LI Shuai-peng1,2, LIN Xiao-long2, ZHANG Feng-qin2, JIANG Yong-heng1,2*, SUN Yu3, LI Si-yuan3, ZHU Dong-you3, LIU Meng-hui3 |
1. State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China
2. College of Physics, Jilin University, Changchun 130023, China
3. College of Automotive Engineering, Jilin University, Changchun 130022, China |
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Abstract In the present paper, an innovative experiment was done. The authors measured the Raman spectra of CS2 mixed with THF at different volume fractions. According to the J. F. Bertran theory, we analyzed the changing regularity of ν1-2ν2 Fermi resonance along with the different concentration. It was shown that the characteristic parameters of Fermi resonance in solution, such as spectra intensity, frequency space, coupling coefficient and anharmonic constant, will make changes along with solution concentration variation. Because of the existing of solvent effects, the spectra intensity decreases gradually, and the coupling coefficient increases gradually. The explanation of such changes is that the vibration spectra are affected not only by scattering coefficient, but also by more weak hydrogen bonds formation. In addition, the asymmetric frequency shift of the Raman spectra was also found in the paper. The fundamental frequency ν1 basically has no shifts, but the overtone frequency 2ν2 moves towards the high wave number gradually, which is inconsistent with the theory of symmetrical movement. According to the study of molecular microcosmic action, the formation and mechanism of the weak hydrogen bond can preferably explain the above phenomenon. The research has a major influence on the further study of solvent effects in Fermi resonance. And the paper will also provide certain reference value for the study of molecule vibration spectra in solution.
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Received: 2013-06-14
Accepted: 2013-09-18
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Corresponding Authors:
JIANG Yong-heng
E-mail: yonghengj@126.com
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