Abstract

High-resolution Fourier-transform spectra of the lower vibrational fundamentals of the 13CD3OH isotopomer of methanol are under investigation in the 800–1350-cm−1 region, including the ν8 in-plane CD3-rocking (A), ν7 CO-stretching (A), ν5 CD3-deformation (A), and ν4 OH-bending (A) bands. The torsion–vibration–rotation energy-level manifold for these lower modes displays numerous perturbations that are due to torsion–vibration interactions and contains a variety of features of interest in the excited-state energy-level patterns. Analyses of the bands show that there are major problems in formulating effective Hamiltonians and in determining reliable molecular constants for the excited states because of strong torsion–vibration coupling. Assignments for five far-infrared laser transition systems have been deduced; these involve the CD3-rocking, CO-stretching, and CD3-deformation states.

© 1994 Optical Society of America

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