REACTIONS OF NITRIC-OXIDE WITH SULFUR SPECIES - INFRARED-SPECTRA AND DENSITY-FUNCTIONAL THEORY CALCULATIONS FOR SNO, SNO+, SSNO, AND SNNO IN SOLID ARGON

Nitrogen oxide sulfide species were produced by codeposition of argon/ nitric oxide with sulfur species from an argon/sulfur vapor microwave discharge or by deposition of an argon/nitrogen/oxygen/sulfur vapor di scharge mixture on a 12 K CsI window. These two new synthetic routes c onfirmed the identification of the SNO radical and produced the linear SNO+ cation and the higher sulfur-containing nitric oxide complex spe cies SSNO at 1772.5 and 670.9 cm(-1). Codeposition of nitric oxide wit h an argon/nitrogen/sulfur vapor discharge produced a new band at 1815 .2 cm(-1), which is assigned to the N-O stretching vibration in the mi xed dimer ONNS species. Reaction of superheated sulfur vapor with argo n/nitric oxide gave only the 1772.5 and 670.9 cm(-1) bands for SSNO wi th no SNO. In contrast codeposition of Ar/O-2 and Ar/NO produced a tra ce of NO2, but the analogous dioxygen-nitric oxide complex was not obs erved. Density functional theory was used to calculate structures and frequencies for these product species.