Infrared Absorption Spectra of SSO^- Anion in Solid Argon

Abstract

When a high-frequency discharged CS 2:O 2:Ar sample was condensed at 4 K, new absorptions at 1003.1 and 567.7 cm -1 were produced. Isotopic substitution ( 13 CS 2 /O 2, C 34 S 2 /O 2, CS 2 / 18 O 2, and mixtures) shows that these new absorptions are due to S−O and S−S stretching vibrations, which involve two inequivalent S atoms and one O atom. The photosensitive behavior and the agreement with frequencies and isotopic frequency ratios from quantum chemical calculations substantiate assignment of these absorptions to the SSO - anion, which was predicted to have a bent structure with elongated S−S and S−O bond lengths relative to those of S 2 O.