Abstract

Two double-resonance techniques have been used to confirm previously proposed assignments of infrared transitions in the CH₃¹⁸OH molecule. The techniques involve a cw CO₂ laser, and they complement each other. The infrared–infrared double-resonance technique is used for probing accidental coincidences between the CO₂ laser lines and Stark-tuned levels of E symmetry. Two such coincidences have been assigned, and the permanent electric dipole moment components μ_a″ and μ_a′ have been determined, for the first time to our knowledge, in this molecule for the ground state and the CO stretch state, respectively. The infrared radio-frequency double-resonance technique has been used to probe a level of A symmetry. This observation has permitted a more accurate determination of molecular asymmetry parameters with (n, K) = (0, 3) in both vibrational levels.

© 1991 Optical Society of America

Infrared–infrared double-resonance spectra of ¹³CH₃OH and ¹²CH₃OH

J. C. Petersen
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Infrared radio-frequency double resonance of ¹³CH₃OH

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Infrared–microwave double-resonance spectroscopy of CH₃OH by use of sidebands of CO₂ laser lines

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