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Thermally-induced chemical reactions between oxidants and astrophysically-relevant compounds

Presentation #220.06 in the session Laboratory Investigations (Poster + Lightning Talk)

Published onOct 23, 2023
Thermally-induced chemical reactions between oxidants and astrophysically-relevant compounds

We have shown previously that thermally-driven chemical reactions can occur under the low temperature conditions found on icy airless bodies. Motivated by the Iogenic sulfur ions impinging Europa, we have mainly focused on the degree to which various sulfur compounds react with radiolytically produced oxidants O3 and H2O2. These studies have shown that the spatial distribution of many of these compounds will be strongly affected by thermally-driven reactions. Recently, we have extended our work to see what other non-sulfur bearing molecules may react under low temperature conditions. Here, we present laboratory results on the efficiency of oxidant reactions involving NH3, providing identification of the main products and stable residues formed during these experiments, as well as activation energies for these reactions to occur. Our results should have implications for many icy objects in the Outer Solar System where NH3 is present in the surface or sub-surface ice.

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