Intensity distribution in the overtone spectra of methyl halides: A local mode analysis of the spectra of methyl halides and methyl cyanide
1987; American Institute of Physics; Volume: 87; Issue: 7 Linguagem: Inglês
10.1063/1.452977
ISSN1520-9032
AutoresMohamed Ahmed, Bryan R. Henry,
Tópico(s)Molecular Spectroscopy and Structure
ResumoThe CH-stretching overtone spectra of CH3Cl, CH3Br, CH3I, and CH3CN are measured at room temperature in the liquid phase in the regions of ΔvCH=2–6. We successfully analyze these spectra with a harmonically coupled local mode model. The local mode parameters ω, ωx, and γ′ω, the coupling parameter between the methyl CH bonds, are determined. Oscillator strengths are obtained from the spectra of the three methyl halides. We demonstrate that these oscillator strengths fit the simple intensity distribution law derived by Medvedev. A parameter determined from this fit is used to discuss the sensitivity of the CH bond potential to the successive replacement of one, two, or three hydrogen atoms of methane by halogens.
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