Abstract

The intensity ratio of the methyl symmetric deformation mode (ca. 1375 cm⁻¹) and a band at ca. 1440 cm⁻¹ can be employed empirically to determine the presence of methyl groups directly attached to ethylenic carbon atoms. Spectra of approximately 70 di- and trisubstituted acyclic and cyclic compounds containing ethylene methyls were examined. A good correlation was obtained between the number of methyl groups and the intensity ratios.

Infrared Band Assignments for the 2900 cm⁻¹ Region Methyl Group Vibrations in XC₆H₄COOCH₃, XC₆H₄CH₃, and XC₆H₄COCH₃ Molecules

Marie-Thèrèse Forel, Nelson Fuson, and Marie-Louise Josien
J. Opt. Soc. Am. 50(12) 1228-1231 (1960)

Organic semiconductor distributed feedback (DFB) laser as excitation source in Raman spectroscopy

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Coherent anti-Stokes Raman spectroscopy measurement of ethylene in combustion

Andrew D. Cutler, Emanuela C. A. Gallo, and Luca M. L. Cantu
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Improvement of sensitivity in the analysis of vibrational properties of thin films by use of in situ ellipsometry: applications to hydrogenated amorphous carbon films

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J. Opt. Soc. Am. B 16(7) 1044-1048 (1999)

Raman spectroscopy: techniques and applications in the life sciences

Dustin W. Shipp, Faris Sinjab, and Ioan Notingher
Adv. Opt. Photon. 9(2) 315-428 (2017)