Raman spectra of CH3CN and CD3CN were measured at ambient pressure and room temperature. The new Fermi resonance theoretical model, which was built based on the perturbation theory, was used to calculate the parameters of ν2～ν3+ν4 Fermi resonance of CH3CN with isotopic substitution method. In addition, we also compared the calculation results with the new theoretical model and the Bertran equations. The new theoretical model can be used not only to calculate the original intensity of the Fermi doublet, but also to calculate the frequencies of the Fermi doublet in absence of the Fermi resonance with the transition dipole moments of the two observed transitions. Besides, we also gave a detailed analysis on the difference between the calculated results based on the Bertran equations and the calculated results in the present work.
～
Fermi
resonance of CH3CN with isotopic substitution method. In addition,
we also compared the calculation results with the new theoretical model and the
Bertran equations. The new theoretical model can be used not only to calculate
the original intensity of the Fermi doublet, but also to calculate the
frequencies of the Fermi doublet in absence of the Fermi resonance with the
transition dipole moments of the two observed transitions. Besides, we also
gave a detailed analysis on the difference between the calculated results based
on the Bertran equations and the calculated results in the present work.
.
Study the ν2～ν3+ν4 Fermi Resonance of CH3CN. Chinese Journal of Light Scattering. 2016, 28(4): 330-333 https://doi.org/10.13883/j.issn1004-5929.201604009
