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Abstract: The formation of water molecules from the reaction between ozone O3 andD-atoms is studied experimentally for the first time. Ozone is deposited onnon-porous amorphous solid water ice H2O, and D-atoms are then sent onto thesample held at 10 K. HDO molecules are detected during the desorption of thewhole substrate where isotope mixing takes place, indicating that watersynthesis has occurred. The efficiency of water formation via hydrogenation ofozone is of the same order of magnitude of that found for reactions involving Oatoms or O2 molecules and exhibits no apparent activation barrier. Theseexperiments validate the assumption made by models using ozone as one of theprecursors of water formation via solid-state chemistry on interstellar dustgrains.



Author: H. Mokrane, H. Chaabouni, M. Accolla, E. Congiu, F. Dulieu, M. Chehrouri, J.L. Lemaire

Source: https://arxiv.org/



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