Photodissociation of Weakly Bound Ion-Molecule Clusters: Kr.SO2(+)

摘要

A photodissociation study of Krypton Sulfurdioxide (+) is presented. Kr-SO2(+) was formed by three-body recombination of S02(+) with Kr in a high pressure ion source. Two ionic products, Kr(+) and SO2(+) were observed when the ion beam was crossed with a focused laser beam. Wavelengths of 458, 488, 514, and 585 nm were used. Product relative kinetic energy distributions, product angular distributions (asymmetry parameters), and product branching ratios were obtained. A statistical phase space calculation was carried out for the SO2(+) Kr product channel. These results suggest either the SO2(+) product is both vibrationally and was electronically excited or a new electronic state of SO2 (+) at approx 1.5 eV is formed. Product relative kinetic energy distributions and angular distributions suggest the Kr(+) ionic product is produced nonstatistically, probably via direct transition to a repulsive state(s) that correlate to Kr(+)(2P 3/2)/SO2(+) products. The Kr(+)/SO2 and SO2(+)/Kr products come from two noninterconverting sets of photoexcited states.