Abstract
The asymmetry splittings of $K$-doublet levels in excited vibrational state of methyl alcohol are found to be sensitive indicators of intermode interactions. Fourier transform spectra reveal giant $K$ doubling of the ${(n\ensuremath{\tau}K)}^{V}={(122)}^{r}$ C${\mathrm{H}}_{3}$-rocking levels due to a near resonance with the CO stretch. Several spectral anomalies are thereby explained, and a significant far-infrared laser transition system is reassigned. The $K$-doublet splittings will provide a useful tool for the study of torsion-mediated mode coupling and intramolecular energy transfer channels in methanol.
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