High Resolution Fourier Transform Far Infrared Spectroscopy of CH3OD

✍ Scribed by Indranath Mukhopadhyay; Pradeep Kumar Gupta; Giovanni Moruzzi; Brenda P. Winnewisser; Manfred Winnewisser

• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 235 KB
• Volume: 186
• Category: Article
• ISSN: 0022-2852
• DOI: 10.1006/jmsp.1997.7422

✦ Synopsis

The high resolution Fourier transform far infrared spectrum of the torsion rotation band of CH 3 OD has been recorded in the range 20-350 cm 01 at a resolution of 0.002 cm 01 . The spectrum shows splitting of the lines due to strong torsional, rotational, and vibrational interactions in the molecule. Assignments were possible for rotational subbands in the ground torsional state (n Å 0) for K values up to 15 and J values of up to 30, for all the symmetry species. In addition, some subbands were also identified which involve torsionally excited states. A total of 63 b-type subband origins, including 6 Q-branch origins obtained from microwave (MW) and millimeter-wave (MMW) studies, were fitted to a semiempirical model. The molecular parameters so determined were able to reproduce the subband origins almost to within experimental uncertainty. The torsional-rotational state-dependent effective molecular parameters and the asymmetry splitting parameters have also been determined. These should prove valuable in the assignment of transitions involving torsionally excited states in the ground vibrational state.