State and velocity distributions of Cl atoms produced in the photodissociation of ICI at 237 nm

Abstract

Photofragment spectroscopy of ICI molecules photodissociated at 237 nm is studied by 2 + 1 resonance-enhanced multi-photon ionization and time of flight techniques. Doppler profiles of the chlorine atom fragments in two spin—orbit states show that chlorine atoms in the ground state, 2P3/2, are produced from a perpendicular dissociative transition, and chlorine atoms in the excited state, 2P12, arise from a parallel transition. The possible electronically excited states leading to dissociation in both the perpendicular and parallel cases are considered.