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- W1646155308 abstract "Noble gases are an important component of the atomic population in the universe. It is generally admitted that these elements are inert and do not participate in molecular structures, except the puzzling X-halides compounds. However, this statement may not be relevant when positive ions are involved, especially is the case of the interstellar medium where positive ions do exist in space as free flyers. These species are mainly protonated species formed by proton transfer from H3+ that plays in the gas phase the role taken by H3O+ in the aqueous phase on Earth. The fact that H3+ may be a possible partner for accreting noble gases is a reasonable assumption since it is the simplest ion derived from the most abundant molecule in the universe and largely involved in the formation of positive ions by proton transfer. This assumption is comforted by recent detection of this molecular ion in a large variety of environments: in star forming regions, in diffuse interstellar media and at the poles of the giant planets of our solar system. In particular, it has also been detected under its deuterated form H2D+ in protoplanetary disks. In that context, we show that molecular complexes with H3+ are stable enough to trap noble gases at low temperatures in hydrogen-rich regions and can serve as a mean to retain these species in the outer solar nebula gasphase. We then argue that H3+ would impede the noble gases to be incorporated in clathrate hydrates during the cooling of the solar nebula. This allows us to explain the deficiency in noble gases observed in comets. We also discuss the possible role of H3+ in the sequestration of noble gases in the production region of solids that were accreted when forming Titan in order to explain the deficiency in noble gases measured by the Huygens probe. If the mechanism of noble gases trapping via H3+ has been efficient in the formation region of these solids, we then predict that the abundances of noble gases are solar in Saturn’s atmosphere while abundances of carbon, nitrogen and sulfur should be oversolar." @default.
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- W1646155308 date "2006-01-01" @default.
- W1646155308 modified "2023-10-16" @default.
- W1646155308 title "H3+ as a sequestrator of noble gases in the outer solar nebula" @default.
- W1646155308 hasPublicationYear "2006" @default.
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