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(2+n) 2-D REMPI spectra of CH3I were recorded for the excitation energy region 64880 cm-1 – 71480 cm-1. Signals for individual ions were integrated to obtain 1D-REMPI spectra of C+, I+ and CH3+. The first two fragments displayed only sharp atomic lines that were compared to values provided by NIST. CH3+ showed broad molecular absorption peaks that were assigned to Rydberg states. Along with the Rydberg states observed, two vibrational band due to the CH3* radical were observed, one of which could not be found in previous experiments.
I+ signals were observed in every measurement, unlike other ion fragments. This suggests that CH3I readily breaks into CH3 and I fragments. This is explained via the dissociation schematic of CH3I which involves two pathways for forming I atoms.
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