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Methyl torsional potentials of rotational isomers of m-methylanisole studied by spectral hole-burning spectroscopy |
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| Authors: | Hiroshi Kojima Kosaku Sakeda Teijiro Ichimura Masao Takayanagi |
| Affiliation: | a Department of Chemistry and Materials Science, Tokyo Institute of Technology, 2-12-1 Ohokayama, Meguro, Tokyo 152-8551, Japan b Department of Environmental Science and Technology, Faculty of Engineering, Shinshu University, Wakasato, Nagano 380-8553, Japan c Graduate School of BASE (Bio-Applications and Systems Engineering), Tokyo University of Agriculture and Technology, Naka-cho, Koganei, Tokyo 184-8588, Japan d Emeritus of Institute for Molecular Science, Myodaiji, Okazaki 444-8585, Japan |
| Abstract: | Laser-induced fluorescence (LIF) excitation spectra of m-methylanisole in a supersonic jet were measured. Two series of progressions were observed in the spectrum, originating at 36048 and 36115 cm−1, which were successfully assigned to the transitions to the methyl internal rotational vibronic levels of the two isomers, i.e. cis and trans isomers, with the aid of hole-burning spectrum measurements and quantum-chemical calculations. The progression for the trans isomer was observed up to the 6a1 band, while only the 3a1 band in addition to the 0a1 and 1e bands was observed for the cis isomer. This finding can be explained by the conformational change upon the electronic excitation; the 60° rotation of the methyl torsional angle takes place for the trans isomer but not for the cis isomer. |
| Keywords: | m-Methylanisole Rotational isomerism Methyl torsional potential Laser-induced fluorescence spectroscopy Hole-burning spectroscopy |
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