New insight on the photofragmentation of CH2I2

An experimental and theoretical investigation of the VUV photofragmentation of CH2I2 molecule is reported. The work focuses on the I-loss channel. The experimental results demonstrate that at energies lower than 12 eV diiodomethane radical cation dissociates only into the CH2I+ ion and an I atom while the theoretical calculationsshow that isomerisation of [CH2I2]+ into iso-diiodomethane [CH2I-I]+ intermediates can occur before the loss ofiodine atom.