| Abstract
| - Differentially pumped X-ray photoelectron spectroscopy has been used to study the surface composition ofsulfuric acid (H2SO4) and sulfuric acid/water mixtures in equilibrium with various atmospheric species. Nitricacid uptake in sulfuric acid solutions was observed below ≈ 220K. Compared to the theoretically predictedbulk composition, a significant enrichment of nitrogen was observed at the interface. The uptake of backgroundwater in sulfuric acid below 200 K was responsible for the reversible uptake of CO2, moderated through theformation of carbonic acid (H2CO3). For CH2O, Cl2, NO, and NO2, no observable surface species were observedover the temperature range studied (≈180−298 K).
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