VIBRATIONAL AND ROTATIONAL EFFECTS ON FRAGMENTATION OF CF3I VIA (2-ENHANCED MULTIPHOTON IONIZATION(1) RESONANCE)

The fragmentation behavior of CF3I in the resonance-enhanced multiphot on ionization (REMPI) spectrum through the electronic C state is inves tigated. Rotational bandshape simulations are used to establish the ex istence of an inhomogeneous predissociation of the resonant intermedia te state. Differences in the rotational profiles with parent and fragm ent ion detection suggest rotational state dependence of the dissociat ion of the electronically excited CF3I+ ion. In addition, a vibrationa l mode dependence is observed in the ratio of I+ to CF3I+ signal, with levels involving excitation Of nu3, the symmetric C-1 stretch, exhibi ting a higher ratio than other vibrationally excited levels with a sim ilar amount of vibrational energy.