Other
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011iaus..280p.394z&link_type=abstract
The Molecular Universe, Posters from the proceedings of the 280th Symposium of the International Astronomical Union held in Tole
Other
Scientific paper
OH radicals have been experimentally observed in interstellar space. Further, it has been proposed that these radicals might be involved in the formation of important molecules in the interstellar clouds, such as H2O, H2O2 and CO2. In order to gain some more insights such reactions, we investigated the best way to produce and isolate OH radicals in water ice. To this end, experiments were carried out in a chamber maintained at low pressure (10-7 mbars) with non-energetic OH radicals at as low temperatures as 3.5 K. Thus, it may be possible to avoid subsequent reactions and to isolate reactional intermediates. To prepare non-energetic OH radicals, gas mixtures containing water molecules were subjected to a microwave discharge. The samples obtained by further condensation of the species formed were then probed by mean of TF-IR spectroscopy. When pure water is subjected to the microwave discharge, the results obtained clearly show that OH radicals are produced, but unfortunately subsequent reactions occur and lead to the formation of water molecules, and only a small amount of OH radicals is caught inside this water ice. On the other hand, it was possible to generate samples containing much higher amounts of OH radicals by subjecting water/rare gas mixtures (instead of pure water) to the microwave discharge, especially when 10% of water is diluted into He. The reactivity of OH radicals with small molecules relevant in the context of interstellar chemistry, was further investigated.
Joshi Pankaj
Krim Lahouari
Zins Emilie-Laure
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