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Fourier Transform Infrared Spectroscopy (FTIR), is used to characterize thin films of sulfur dioxide trapped in excess of amorphous water ice and to study the photo-oxidation of pure solid SO 2 or of SO 2 diluted in water ice. These laboratory experiments were undertaken in an attempt to find information on the formation of hydrated sulfuric acid detected on Europa's surface. Vibrational spectra at 30 K of mixed films containing SO 2 with an excess of water depend on the deposition conditions. A metastable (SO 2 ) m (H 2 O) n phase and a solid solution of SO 2 in water ice have been evidenced. Irradiation at 266 nm of mixed films SO 2 /O 3 /H 2 O produces sulfur trioxide and hydrogen peroxide without traces of sulfuric acid. Irradiation of films of pure SO 2 , under 200 nm, leads to sulfur trioxide and to ozone. When SO 2 is diluted in amorphous water ice, new weak bands that appear after irradiation suggest the formation of sulfuric acid. PACS No.: 82.50Hp
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Schriver-Mazzuoli et al. (2003) studied this question.
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