Abstract
Sulfur trioxide (SO 3 ) isolated in solid argon at 12 K was irradiated with light at 193 nm from an ArF excimer laser. Recombination of photofragments O and SO 2 produces OSOO that absorbs at 1229.6, 1041.3, and 597.6 cm -1 . The assignments are based on observed 34 S- and 18 O-isotopic shifts. Theoretical calculations using the B-P86 and the B3-LYP density functional methods were carried out for five isomers of SO 3 ; energies and vibrational wave numbers were predicted for each one. Observed line positions, infrared intensities, and isotopic shifts fit well with those predicted for cis-OSOO at the B-P86 level. Further irradiation of the matrix sample with emission at 248 nm from a KrF laser bleached OSOO and enhanced absorption lines of SO 2 and, to a lesser extent, of SO 3 . The mechanism of formation of OSOO in a matrix cage is discussed. © 1996 American Institute of Physics.