Spectroscopy of the C-H stretching vibrational band in selected organic molecules

Jiří Šebek, Roie Knaanie, Brian Albee, Eric O. Potma, R. Benny Gerber*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

22 Scopus citations


The vibrational spectroscopy of C-H stretches in organic molecules is of considerable importance for the characterization of these systems and for exploration of their properties. These stretches are strongly anharmonic, and thus methods including anharmonicity have to be used. The vibrational self-consistent field (VSCF) is applied to the following organic compounds: acetone, dimethylacetylene, neopentane, toluene, ethylene, and cyclopropane. The computed spectra are compared to new experimental data, including Raman measurements of all molecules except cyclopropane and IR of acetone, neopentane, and ethylene. A high level of agreement is found for all of the molecules. The characteristic features of CH3 and CH2 groups are studied and analyzed in detail. A reliable, unambiguous assignment of vibrational modes to spectral peaks is provided. Several characteristic features of CH3 and CH2 vibrations in polyatomic molecules are clarified, providing easier assignments for different types of organic molecules.

Original languageAmerican English
Pages (from-to)7442-7452
Number of pages11
JournalJournal of Physical Chemistry A
Issue number32
StatePublished - 15 Aug 2013


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