Sub-Doppler Infrared Spectra and Torsion–Rotation Energy Manifold of Methanol in the CH-Stretch Fundamental Region
✍ Scribed by Li-Hong Xu; Xiaoliang Wang; Thomas J. Cronin; David S. Perry; Gerald T. Fraser; Alan S. Pine
- Publisher
- Elsevier Science
- Year
- 1997
- Tongue
- English
- Weight
- 438 KB
- Volume
- 185
- Category
- Article
- ISSN
- 0022-2852
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✦ Synopsis
The infrared spectrum of jet-cooled methanol in the CH-stretch fundamental region has been investigated by two sub-Doppler laser techniques: optothermally detected molecular-beam electric resonance and direct-absorption slit-jet spectroscopy. With the aid of microwave-infrared double resonance and ground state combination differences, 27 subbands in the frequency range 2967 to 3027 cm 01 have been assigned to the n 2 fundamental. Perturbation systems in the K Å 0 E, 01 E, and 02 E symmetry subbands have been analyzed to yield matrix elements of 0.013, 0.041, and 0.75 cm 01 , respectively. The A-E torsional tunneling splitting for J Å 0 of the n 2 vibration of 03.26 cm 01 is of opposite sign and a factor of three smaller in magnitude than the ground state value of /9.12 cm 01 .