Photodissociation dynamics of ICH2Cl → CH2Cl + I*/I: photofragment translational spectroscopy at 304 and 277 nm

Abstract

The photodissociation dynamics of ICH₂Cl → CH₂Cl + I*/I at 304 and 277 nm has been investigated with our mini-TOF photofragment translational spectrometer with a weak acceleration field of <1 V cm⁻¹. Many peaks are resolved or partially resolved in the TOF spectra and the photofragment translational spectra (PTS) of both the I*(²P_1/2) channel and the I(²P_3/2) channel. These resolved peaks are assigned to the C–Cl stretch vibrational states of the CH₂Cl fragment. The rotational energy E_R of the CH₂Cl fragment is highly excited due to its asymmetric structure. The value of E_R/E_T is measured to be about 0.71. In the I* channel, the partitioning of the available energy E_avl into the translational energy E_T, the rotational energy E_R, and the vibrational energy E_V for each resolved vibrational state has been calculated.