Abstract
Single-photon direct absorption and resonance-enhanced multiphoton ionization excitation spectra were recorded for CH 3I in a jet-cooled molecular beam. The rovibrationally cold molecules yield lineshapes that are lifetime broadened by predissociation. Lorentzian fits were used to extract lifetimes for specific vibronic excitation in the B̃ and C̃ Rydberg states. The measured lifetimes of the B̃ state are 0.87 ps (origin), 0.83 ps (ν 2), 0.92 ps (ν 3), and 0.67 ps (ν 6). The C̃ state origin has a lifetime of 0.25 ps. These results are compared to previous measurements and discussed in terms of possible mode-specific predissociation.
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