二元溶液中基频拉曼散射系数随浓度变化对费米共振的影响

在二硫化碳(CS₂)和苯(C₆H₆)的二元溶液中,随着相对体积浓度而变化,C₆H₆的基频ν_１(992 cm-1) 的拉曼散射系数随浓度减小而增加,而CS₂的基频ν₁(656 cm-1)的拉曼散射系数则随浓度增加而增加。文章测量了这二元溶液相对不同体积浓度的拉曼光谱。结果表明,尽管CS₂和C₆H₆的基频ν₁的强度都随着浓度变化而发生较大变化,但C₆H₆的基频ν₁对其参与的ν₁+ν₆～ν₈费米共振几乎没有影响,而CS₂的基频ν₁强度的变化不仅对ν₁～2ν₂费米共振产生较大影响,还使基频ν₂发生变化。文章给出了实验结果,并用Bertran费米共振理论和群论给予了解释。

Effect of the Change in Fundamental Raman Scattering Coefficient with the Concentration on Fermi Resonance in Binary Solution

The Raman scattering coefficients of the fundamental ν1 (992 cm~(-1)) of C_6H_6 and the fundamental ν1 (656 cm~(-1)) of CS_2 changed dramatically with relative concentration of the binary solution of CS_2 and C_6H_6.The Raman spectra of the binary solution with different relative concentrations were measured.The results show that both the ν1 fundamentals intensities changed dramatically with the relative concentration of the solution and the fundamental ν1 of C_6H_6 has little effect on the Fermi resonance ν1+ν6～ν8.On the contrary,the change in the ν1 fundamental intensity of the CS_2 changed which has more effect not only on the Fermi resonance ν1～2_(ν2) but also on the ν2 fundamental.In this report,the experimental results were analyzed based on the J.F.Bertran theory and group theory.