Abstract
The vibrationless bands of the methyl 4p 2A‘2 ←X 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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