Abstract
The 0 0 0 band of the CH 3 3p z 2A 2″ ← X̃ 2A 2″ Rydberg transition has been recorded using the (2 + 1) resonance-enhanced multi-photon ionization (REMPI) of CH 3 at 333 nm. CH 3 was generated in a discharge flow reactor at room temperature and in a hot-filament-assisted chemical vapor deposition (HFCVD) reactor at temperatures of 820 to 1700 K. By means of spectral simulation the rotational constants, B 0′ and C 0′, and the rotational state-dependent predissociation rates of the 3p z 2A 2″ state were determined. Based on these constants and the well-known rotational and vibrational ground-state constants, relative intensities of the CH 3 REMPI spectra were calculated for temperatures up to 2300 K. These spectra were used to evaluate relative CH 3 concentrations from measured REMPI peak intensities of the dominant Q branch.
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