Physics
Scientific paper
May 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusm.p23a..06c&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #P23A-06
Physics
5410 Composition (1060, 3672), 5422 Ices, 6218 Jovian Satellites, 6280 Saturnian Satellites
Scientific paper
Absorption bands at 1259 and 1142 cm-1 in H2O-O2 ice mixtures irradiated with 0.8 MeV protons at 9 K, have been assigned to the HO3 and HO2 radicals respectively. The assignment of these bands is based upon isotopic shift measurements when 18O2 is used. These bands are also observed in irradiated H2O-O3 and pure H2O2 ices. In each case, they are formed by the following reactions: H + O3 → HO3
H + O2 → HO2
While neither radical has been observed in ice using infrared spectroscopy before, the HO2 radical is known to form in irradiated water ice, but remarkably, the lesser known HO3 is the more prominent spectral feature.
These species are probably formed in the surfaces of icy outer solar system bodies where O2 and O3 have already been observed. Their ability to remain trapped in ice is unknown and their reactivity at typical surface temperatures may prevent signficant concentrations being produced. However, even as intermediate species, due to their reactivity they may constitute an important component of the oxidant population in such ices. If they can remain trapped, they may provide a potential energy source for organic reactions or even microbial life in places such as Europa's sub-surface ocean.
Cooper Paul D.
Hudson Reggie L.
Moore Marla H.
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