CONFIRMATION OF VIBRATION COUPLING IN THE SYMMETRIC CH STRETCH AS REVEALED BY COHERENCE-DETECTED FTMW-IR SPECTROSCOPY OF CH$_3$OD.
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Date
2009
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Publisher
Ohio State University
Abstract
\maketitle Rotational state-selection with E-species transitions ($3_0\leftarrow 3_{-1}$,$2_0\leftarrow 3_1$,$1_0\leftarrow 1_1$) is employed to record the infrared spectra in the range 2750-2900 cm$^{-1}$. The observed spectra of CH$_3$OD contain only one vibrational band origin whereas 12 interacting vibrational bands of CH$_3$OH are observed in the same interval. There are no interacting vibrational bands in the CH$_3$OD spectra because the first tier states are shifted out of resonance. This observation confirms that the dominant coupling pathway in the $\nu _3$ CH stretch of CH$_3$OH is the third order coupling of the CH stretch to a combination of the COH bend and an HCH bend, which subsequently couples to high order combination bands involving torsional excitation.
Description
Author Institution: Department of Chemistry, The University of Akron, Akron OH 44325; Department of Chemistry, University of Virginia, McCormick Rd., P.O. Box 400319, Charlottesville, VA 22904