Photodissociation Dynamics of Weakly Bound Ion-Neutral Clusters: SO2.O2+

摘要

A photodissociation study of SO2 O2+ is presented. The experiments were carried out on mass selected ion beams that were crossed with a polarized laser beam and then photoproducts were mass and energy analyzed. The SO2 O2+ ions were formed by three body association reactions in a pressure and temperature dependent ion source. Studies were carried out at wavelengths of 582, 514, 488, 458, and 357 + or - 7 nm using an argon ion laser/dye laser system. Both O2+/SO2 and SO2+/02 photoproducts were observed and the branching ratio measured as a function of lambda. In addition, product kinetic energy distributions and angular distributions (asymmetry parameters) were measured and statistical phase space theory calculations were carried out. The results indicate the O2+/SO2 products are formed from photon absorption to a bound excite state at all wavelengths followed by internal conversion to the ground state and statistical vibrational predissociation. Keywords: Photodissociation, Weakly bound ion neutral, Clusters, Sulfides, Oxygen.