Abstract
The coupling of CH stretching with methyl internal rotation (torsion) causes complexity in methyl CH stretching overtone spectra. We have used a CH stretching methyl torsion model to simulate the methyl band overtone profiles. Room-temperature vapor phase overtone spectra of acetic acid (ΔvCH = 4−5) and 2-methylfuran (ΔvCH = 4−5) have been recorded in the methyl CH stretching regions. These combined with previously studied molecules acetone, acetaldehyde, toluene, methylpyridines, and xylenes provide a series of molecules with gradually varying barrier heights.
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