Ion processing of ices and the origin of SO2 and O3 on the icy surfaces of the icy jovian satellites
Journal
Date Issued
2016
Author(s)
Boduch, P.
•
Brunetto, R.
•
Ding, J. J.
•
Domaracka, A.
•
Kaňuchová, Z.
•
•
Rothard, H.
•
Strazzulla, G.
Abstract
We present new experimental results relative to 144 keV S^9+ or Ar^9+ ion implantation in targets made of oxygen rich frozen gases (O_2, CO_2) and mixtures with water ice. Spectra in the UV (200-400 nm) range have been obtained before and after implantation. The targets have been selected because they can be representative of the parent molecules from which SO_2 and O_3, observed to be present on the surfaces of Jupiter's icy Moons, could be formed due to radiolysis induced by the abundant magnetospheric ions. The results indicate that sulfur dioxide is not detectable after sulfur implantation in oxygen bearing species. Ozone is formed after argon and sulfur ion implantation. Sulfur implantation in O_2 and CO_2 targets also induces the formation of a band centered at about 255 nm (that we tentatively attribute to SO_3^- radicals). In the mixtures with water the band appears initially at the same wavelength and shifts to about 247 nm at higher ion fluences possibly indicating the formation of sulfite (HSO_3^-) ions. An absorption band observed on Ganymede is well fitted by using three components: ozone, sulfite ions and a not identified component having an absorption band centered at 298 nm.
In all of the studied cases ion implantation produces a spectral reddening over the investigated spectral range (200-400 nm) that well mimics the observed spectral slopes of Jupiter's icy satellites.
Volume
277
Start page
424
Issn Identifier
0019-1035
Ads BibCode
2016Icar..277..424B
Rights
open.access
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