Experimental evidence for water formation via ozone hydrogenation on dust grains at 10 K

Abstract

The formation of water molecules from the reaction between ozone (O3) and D-atoms is studied experimentally for the first time. Ozone is deposited on non-porous amorphous solid water ice (H2O), and D-atoms are then sent onto the sample held at 10 K. HDO molecules are detected during the desorption of the whole substrate where isotope mixing takes place, indicating that water synthesis has occurred. The efficiency of water formation via hydrogenation of ozone is of the same order of magnitude of that found for reactions involving O atoms or O2 molecules and exhibits no apparent activation barrier. These experiments validate the assumption made by models using ozone as one of the precursors of water formation via solid-state chemistry on interstellar dust grains.

16 pages, 2 figures, to be published on ApJL

References in corpus (5)

• Simulation of the Formation and Morphology of Ice Mantles on Interstellar Grains
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• Formation of hydrogen peroxide and water from the reaction of cold hydrogen atoms with solid oxygen at 10K
• Mobility of D atoms on porous amorphous water ice surfaces under interstellar conditions
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