Abstract

Laser-induced excitation and wavelength-resolved emission spectra of the methoxy (CH3O) radical have been obtained in a supersonic jet environment. Fluorescence in the near ultraviolet from several vibronic bands belonging to the A2A1-X2E electronic system of CH3O has been dispersed by a 0.6 m monochromator with a resolution of 0.3 nm. A complete set of vibrational frequencies with all assignments for the X2E state of CH3O has been obtained. To the best of our knowledge, the dispersed spectra of CH3O for the 220 and 210310 bands are presented here for the first time. The vibrational constants determined by a least-squares fit for the ν3 mode are ω″e = 1071 cm−1 and ω″ex″e = 8.4 cm−1. For the Jahn-Teller active ν6 mode, the vibrational and anharmonic constants ω″e = 786 cm−1 and ω″ex″e = 55 cm−1, respectively, have been obtained for the first time.

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