A study of the Raman spectra of alkanes in the Fermi-resonance region

The experimental and theoretically predicted Raman spectra for the first few alkanes in the homologous series: methane, ethane, propane and butane are presented for the region 2700–3100 cmK1. The structure of the spectra is rather complex. Analysis of the results obtained shows that Fermi resonance occurs between the CH stretching vibrations in the 3000 cmK1 region and the 2n overtones of deformation vibrations in the low frequency (1450–1500 cmK1) region. q 2004 Elsevier B.V. All rights reserved