Other
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufm.p32b..04o&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #P32B-04
Other
5421 Interactions With Particles And Fields, 5422 Ices, 5470 Surface Materials And Properties
Scientific paper
It is well known that the bombardment of ice covered surfaces in the outer solar system leads to chemical transformations and alteration of molecular compositions. Among the major radiolysis products remaining trapped within the ice are highly reactive, oxygen rich molecules and radicals. Studies of pure ices have revealed much information about production and survival of oxidants, but real systems are full of impurities and the ability of these oxidizers to react and alter other embedded impurities gives rise to significant indirect channels for radiation-induced chemistry. Observational and experimental evidence indicates that the presence of CO2 is correlated with carbonaceous surfaces rather than strictly the presence of carbon bearing molecules. Graphitic substrate interactions with ice overlayers impede oxidant formation by scavenging of reactively scattered O, O+, OH and other fast, hot fragments. These interfacial reactions consume graphitic and carbonaceous particles and produce formic acid, formaldehyde, CO and CO2. This talk will focus on the role of ice: grain interfacial reactions in determining the potential oxidant inventory.
Grieves Gregory A.
Orlando Thomas M.
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