Isomers of SO3: Infrared absorption of OSOO in solid argon

Shen‐Horng Jou, Min‐yi Shen, Chin‐hui Yu, Yuan‐Pern Lee
<span title="1996-04-15">1996</span> <i title="AIP Publishing"> <a target="_blank" rel="noopener" href="https://fatcat.wiki/container/hnc5ddfunnd3taca63uf5ggldm" style="color: black;">Journal of Chemical Physics</a> </i> &nbsp;
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 Ϫ1 . 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
more &raquo; ... ne 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.
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