TITLE

Photo-oxidation of SO2 and of SO2 trapped in amorphous water ice studied by IR spectroscopy. Implications for Jupiter 's satellite Europa

AUTHOR(S)
Schriver-Mazzuoli, L.; Schriver, A.; Chaabouni, H.
PUB. DATE
January 2003
SOURCE
Canadian Journal of Physics;Jan2003, Vol. 81 Issue 1/2, p301
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
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 photooxidation of pure solid SO[SUB2] or of SO[SUB2] 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[SUB2] with an excess of water depend on the deposition conditions. A metastable SO[SUB2])[SUBm](H[SUB2]O)[SUBn] phase and a solid solution of SO[SUB2] in water ice have been evidenced. Irradiation at 266 nm of mixed films SO[SUB2]/O[SUB3]/H[SUB2]O produces sulfur trioxide and hydrogen peroxide without traces of sulfuric acid. Irradiation of films of pure SO[SUB2], under 200 nm, leads to sulfur trioxide and to ozone.When SO[SUB2] is diluted in amorphous water ice, new weak bands that appear after irradiation suggest the formation of sulfuric acid.
ACCESSION #
9989022

 

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