Abstract
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−1have been assigned to the ν2fundamental. Perturbation systems in theK′ = 0E, −1E, and −2Esymmetry subbands have been analyzed to yield matrix elements of 0.013, 0.041, and 0.75 cm−1, respectively. TheA–Etorsional tunneling splitting forJ= 0 of the ν2vibration of −3.26 cm−1is of opposite sign and a factor of three smaller in magnitude than the ground state value of +9.12 cm−1.
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