The vibrationless bands of the methyl 4p 2A″2 ←X̃ 2AA″2 0–0 Rydberg transition have been recorded by mass selected (2+1) REMPI spectroscopy using photolytically generated CH3 and CD3 radicals. A least-squares analysis of the spectra determines values for the band origin and the rotational constants B′, D′N, DNK, and (C′−C″). Linewidths in the CH3 spectrum show a pronounced rotational level dependence and by means of a spectral simulation a heterogeneous predissociation is identified and shown to be induced by a perpendicular Coriolis coupling mechanism.
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Black et al. (1988) studied this question.
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