Abstract
ABSTRACT This article describes recent studies of atmospherically relevant reactions using spectroscopic techniques by our group at the Wadsworth Center. Heterogeneous reactions of SO2 with either HOBr or HOCl on ice have been studied using a coated-wall flow reactor coupled with differentially pumped quadrupole mass spectrometer, and the reaction of NO2+HI has been investigated using Fourier transform infrared spectroscopy (FTIR). Reaction probabilities or rate constants have been determined at relevant atmospheric temperatures. Specular reflection-absorption infrared spectroscopy and the temperature programmed desorption technique were employed to study the adsorption of oxalic acid on a Cu surface at 175 K. Reflection-absorption infrared spectroscopy showed that oxalic acid is molecularly adsorbed on the Cu surface. The results obtained from these studies provide a better understanding of atmospheric reactions at a molecular level and enable an assessment of the relative importance of the reactions in the atmosphere.
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