Torsion-rotation far-infrared spectrum of O-18 methanol |
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Authors: | R M Lees R R J Goulding Saibei Zhao I Mukhopadhyay and J W C Johns |
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Institution: | (1) Department of Physics, University of New Brunswick, E3B 5A3 Fredericton, New Brunswick, Canada;(2) Department of Physics, Memorial University of Newfoundland, A1B 3X7 St. John's, Newfoundland, Canada;(3) Laser Programme, Centre for Advanced Technology, 452 013 Indore, M. P., India;(4) Steacie Institute of Molecular Sciences, National Research Council of Canada, K1A 0R6 Ottawa, Ontario, Canada |
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Abstract: | High-resolution Fourier transform spectra have been recorded from 15–470 cm–1 for the far-infrared trosion-rotation band of O-18 methanol in the vibrational ground state. So far, 57 subbands have been assigned in the 15–220 cm–1 region for a wide range of rotational and torsional states, and their J-independent origins have been determined to an estimated accuracy of ±0.01 cm–1. The observed origins were found to deviate in many cases by several tenths of a cm–1 from the values calculated with the previous molecular parameters. Together with 4 known microwave origins, the new data have been fitted to a model torsion-rotation Hamiltonian in order to refine the set ofb-type molecular constants for the ground state. With the new parameter set, the experimental subband origins are reproduced with an rms error of ±0.02 cm–1, representing a substantial improvement over the earlier situation. The spectroscopic results have also been of great assistance with our assignments of optically-pumped FIR laser emission in CH3
18OH, in providing FIR data for checking the identification of the IR-pump/FIR-laser transition systems through combination loop relations. |
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Keywords: | far-infrared FT spectroscopy methanol torsion CH3
18OH |
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