Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999dps....31.5008m&link_type=abstract
American Astronomical Society, DPS meeting #31, #50.08
Astronomy and Astrophysics
Astronomy
Scientific paper
Hydrogen peroxide has been identified on Europa (Carlson et al. 1999) based in part on the 3.50 micron absorption feature observed in Galileo NIMS spectra. The observed feature was fitted with laboratory reflectance spectra of H_2O + H_2O_2. Since condensed phase molecules on Europa (H_2O, CO_2, SO_2, and H_2O_2) are bombarded with a significant flux of energetic particles (H(+) , O(n+) , S(n+) and e(-) ), we examined the proton irradiation of H_2O at 80 K and the conditions for the IR detection of H_2O_2 near 3.5 microns. Contrary to expectations, H_2O_2 was not detected if pure H_2O ice was irradiated at 80 K. This was an unexpected result since, H_2O_2 was detected if pure H_2O was irradiated at 18 K. We find, however, that if H_2O ice contains either O_2 or CO_2 then H_2O_2 is detected after irradiation at 80 K (Moore and Hudson, 1999). The source of O_2 for the H_2O ice on Europa could come from surface interactions with the tenuous oxygen atmosphere, or from the bombardment of the surface by O(n+) . Carlson, R. W., M. S. et al. Science 1999, 283, 2062-2064 Moore, M. H. and R. L. Hudson Icarus (submitted).
Hudson Reggie L.
Moore Marla H.
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