Physics
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011iaus..280e..45d&link_type=abstract
The Molecular Universe, Proceedings of the 280th Symposium of the International Astronomical Union held in Toledo, Spain, May 30
Physics
Scientific paper
Water is observed in many astrophysical environments in both gas and solid phase. Water by its specific properties, is probably the main molecule that structures the gas-solid interaction. In cold environments, its synthesis is supposed to occur directly in solid phase, and then, water ice mantles act as a catalytic matrix for subsequent synthesis of various molecules. When the medium begin to warm again, water sublimates and nourishes the gas phase, for example in comets or in star forming regions. Over the last 4 years, water formation on cold surfaces has been studied experimentally. Different precursors (O, O2, O3) have been used to understand the complex mechanisms that take place. Although there are still numerous open questions, at now, it is clear that water is easily formed by different pathways, and that the ice formed has an amorphous structure. The presentation will be the opportunity to resume the major progresses in this area. The recent observations of the ortho/para (o/p) ratio of water with Herschel satellite have similarities with previous observations of o/p ratio of water in comets. Some experimental work have been recently reported in this domain, mostly studies in rare gas matrices or H2/H2O systems. In the presentation, definition of gas phase o/p ratio will be recalled, and possible mechanisms of conversion will be explained. Finally, I will discuss if microphysics properties of water desorption can explain the o/p ratio values observed.
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