Citation:
Abstract:
We present in this work a high-resolution Fourier transform infrared study of the OH-bending vibrational band of 13have investigated the 1070–1400 cm1 spectral region at 0.002 cm1 resolution using the modified Bomem DA3.002 FourierCH3 1338 cm1 transform spectrometer at the Steacie Institute for Molecular Sciences at the National Research Council of Canada in Ottawa. Thisstudy has led to (i) determination of excited-state J(J 1) subband expansion coefficients and (ii) characterization of a variety ofinteractions coupling the different vibrational modes, notably a strong Fermi resonance between the OH bend and the torsionallyexcited CH3 have been fitted to J(J 1) power-series expansions in order to obtain the subband origins and the state-specific energy expansioncoefficients for both the OH-bending and excited torsional CH3 and the first excited torsional CH3 asymmetry splitting of the (n K)v (122)runusual behavior, but a quantitative analysis of the vibrational coupling is restricted by limited knowledge of the unperturbedpositions of the interacting levels. All these interactions provide relaxation channels for intramolecular vibrational redistributionamong the lower vibrational modes in 13CH3OH-bending state display an inverted pattern compared to the ground state. © 1998 Academic Press