Abstract
An upper limit for the gas phase absorption cross sections for H2SO4 over the wavelength range 195 to 330 nm has been determined. Absorption measurements were made using a diode array spectrometer and a 100 cm long heated absorption cell. Gas phase H2SO4 was generated in a gas flow by titrating (equilibrating) known amounts of SO3 via the reaction at elevated temperatures, ∼ 500 K. Upper limits to the H2SO4 absorption cross sections were obtained, <1 × 10−21 cm² molecule−1, and provide an upper limit to the atmospheric photolysis rate of H2SO4. The implications of this cross section limit to stratospheric sulfur chemistry are discussed.
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