中国物理B ›› 2012, Vol. 21 ›› Issue (8): 83301-083301.doi: 10.1088/1674-1056/21/8/083301

• ATOMIC AND MOLECULAR PHYSICS • 上一篇    下一篇

The effect of anti-hydrogen bond on Fermi resonance: A Raman spectroscopic study of the Fermi doublet ν1ν12 of liquid pyridine

李东飞a b, 高淑琴b, 孙成林a b, 里佐威a b   

  1. a State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China;
    b College of Physics, Jilin University, Changchun 130012, China
  • 收稿日期:2011-07-09 修回日期:2011-11-11 出版日期:2012-07-01 发布日期:2012-07-01
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No. 10974067) and the Graduate Innovation Fund of Jilin University, China (Grant No. 20101055).

The effect of anti-hydrogen bond on Fermi resonance: A Raman spectroscopic study of the Fermi doublet ν1ν12 of liquid pyridine

Li Dong-Fei (李东飞)a b, Gao Shu-Qin (高淑琴)b, Sun Cheng-Lin (孙成林)a b, Li Zuo-Wei (里佐威 )a b   

  1. a State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China;
    b College of Physics, Jilin University, Changchun 130012, China
  • Received:2011-07-09 Revised:2011-11-11 Online:2012-07-01 Published:2012-07-01
  • Contact: Li Zuo-Wei E-mail:zuowei_li@163.com
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 10974067) and the Graduate Innovation Fund of Jilin University, China (Grant No. 20101055).

摘要: The effects of anti-hydrogen bond on the ν1ν12 Fermi resonance (FR) of pyridine are experimentally investigated by using Raman scattering spectroscopy. Three systems, pyridine/water, pyridine/formamide, pyridine/carbon tetrachloride, provide varying degrees of strength for the diluent-pyridine anti-hydrogen bond complex. Water forms a stronger anti-hydrogen bond with pyridine than with formamide, and in the case of adding non-polar solvent carbon tetrachloride, which is neither a hydrogen bond donor nor an acceptor and incapable of forming hydrogen bond with pyridine, the intermolecular distance of pyridine will increase and the interaction of pyridine molecules will reduce. The dilution studies are performed on the three systems. Comparing with the values of Fermi coupling coefficient W of the ring breathing mode ν 1 and triangle mode ν 12 of pyridine at different volume concentrations, which are calculated according to the Bertran equations, in three systems, we find that the solution with the strongest anti-hydrogen bond, water, shows the fastest change in the ν1ν12 Fermi coupling coefficient W with the volume concentration varying, followed by the formamide and carbon tetrachloride solutions. These results suggest that the stronger anti-hydrogen bond-forming effect will cause a greater reduction in the strength of the ν1ν12 FR of pyridine. According to the mechanism of the formation of anti-hydrogen bond in the complexes and the FR theory, a qualitative explanation for the anti-hydrogen bond effect in reducing the strength of the ν1ν12 FR of pyridine is given.

关键词: Fermi resonance, Raman spectrum, anti-hydrogen bond

Abstract: The effects of anti-hydrogen bond on the ν1ν12 Fermi resonance (FR) of pyridine are experimentally investigated by using Raman scattering spectroscopy. Three systems, pyridine/water, pyridine/formamide, pyridine/carbon tetrachloride, provide varying degrees of strength for the diluent-pyridine anti-hydrogen bond complex. Water forms a stronger anti-hydrogen bond with pyridine than with formamide, and in the case of adding non-polar solvent carbon tetrachloride, which is neither a hydrogen bond donor nor an acceptor and incapable of forming hydrogen bond with pyridine, the intermolecular distance of pyridine will increase and the interaction of pyridine molecules will reduce. The dilution studies are performed on the three systems. Comparing with the values of Fermi coupling coefficient W of the ring breathing mode ν 1 and triangle mode ν 12 of pyridine at different volume concentrations, which are calculated according to the Bertran equations, in three systems, we find that the solution with the strongest anti-hydrogen bond, water, shows the fastest change in the ν1ν12 Fermi coupling coefficient W with the volume concentration varying, followed by the formamide and carbon tetrachloride solutions. These results suggest that the stronger anti-hydrogen bond-forming effect will cause a greater reduction in the strength of the ν1ν12 FR of pyridine. According to the mechanism of the formation of anti-hydrogen bond in the complexes and the FR theory, a qualitative explanation for the anti-hydrogen bond effect in reducing the strength of the ν1ν12 FR of pyridine is given.

Key words: Fermi resonance, Raman spectrum, anti-hydrogen bond

中图分类号:  (Raman and Rayleigh spectra (including optical scattering) ?)

  • 33.20.Fb
42.62.Fi (Laser spectroscopy)