Abstract
Mercury-xenon arc lamp photolysis of argon matrix samples at 12 K containing hydrogen sulfide and sulfur dioxide produced eight new infrared absorptions at 2591, 1209, 1093, 762, 476, 450, 340 and 270 cm −1 . Extensive deuterium and oxygen-18 isotopic substitutions studies, and normal-coordinate calculations on all isotopomers, allow the assignment of these absorptions to eight vibrational modes of sulfinic acid. The HSO 2 H molecule is formed by in situ hydrogen atom addition to matrix-isolated sulfur dioxide molecules. This is the first infrared spectroscopic observation of this reactive molecule
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