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- W2068998601 abstract "The experimental determination of the mass accommodation coefficient of H2SO4 vapor on aqueous sulfuric acid and the gas-phase diffusion coefficient of H2SO4 vapor in N2/H2O at 303 K is reported. The measurements were carried out under laminar flow conditions in a coated wall tubular flow reactor coupled to a chemical ionization mass spectrometer for gas-phase detection. Wall loss rates of H2SO4 vapor, from which both the mass accommodation coefficient and the gas diffusion coefficient were determined, were measured as a function of total reactor pressure, water vapor concentration, and sulfuric acid vapor concentration. The observed wall loss rate coefficient depends linearly on the inverse of the total reactor pressure (0.54−10 Torr) and is independent of the aqueous sulfuric acid composition over the range 73−98 wt %, which was varied by the addition of water vapor. A kinetic model based on the additivity of kinetic resistances that couples gas-phase diffusion and mass accommodation to the measured H2SO4 vapor loss rate has been applied to the data. The model yields a lower limit of 0.43 with a best fit value of 0.65. The mass accommodation coefficient is independent of the liquid H2SO4/H2O composition over the range investigated. The gas-phase diffusion coefficient for H2SO4 vapor in N2/H2O (H2O mixing ratio ≤0.32) was determined to be 66.8 ± 1.1 Torr cm2 s-1. The resistance model agrees well with a more rigorous approximate solution to the full continuity equation describing mass transport and kinetics. The atmospheric implications of the reported results are discussed." @default.
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- W2068998601 date "1998-11-11" @default.
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- W2068998601 title "Mass Accommodation Coefficient of H<sub>2</sub>SO<sub>4</sub>Vapor on Aqueous Sulfuric Acid Surfaces and Gaseous Diffusion Coefficient of H<sub>2</sub>SO<sub>4</sub>in N<sub>2</sub>/H<sub>2</sub>O" @default.
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- W2068998601 doi "https://doi.org/10.1021/jp982809s" @default.
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