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Production of neutral species in Titan's ionosphere through dissociative recombination of ions

hal.structure.identifierLaboratoire de Chimie Physique D'Orsay [LCPO]
dc.contributor.authorPLESSIS, Sylvain
hal.structure.identifierPLANETO - LATMOS
dc.contributor.authorCARRASCO, Nathalie
hal.structure.identifierSSE 2012
dc.contributor.authorDOBRIJEVIC, M.
hal.structure.identifierLaboratoire de Chimie Physique D'Orsay [LCPO]
dc.contributor.authorPERNOT, Pascal
dc.date.issued2012
dc.identifier.issn0019-1035
dc.description.abstractEnThe production rates of neutral species by Dissociative Recombination (DR) of molecular ions with electrons in the ionosphere of Titan are quantified by a new model, including, for the first time, all the available kinetic data on this process. The calculation is based on the ion densities measured by the INMS instrument on Cassini orbiter during flyby T19 at 1100 km altitude. These production rates are compared with those predicted by photochemical models: we calculate that for many neutral species, DR has larger production rates than neutral chemistry. Concerning molecular growth in Titan's ionosphere, DR is shown to have two antagonistic effects: (1) a global chemical lysis of ions through C-C and C-N bond breaking (missed by the "H-loss" DR paradigm); and (2) an enhancement of the neutral chemistry by production of reactive radicals, such as C2H or NH2. Further exploration of this chemistry requires the development of ionospheric coupled models taking explicitly into account the richness of the DR process and the strong impact of ions on the budget of neutral species. This study emphasizes also the urgent need of additional experimental studies about DR of molecular ions, with two priorities: evaluation of the impact of the temperature of ions on the rates and fragmentation patterns, and the systematic study of the fragmentation patterns of CxHyView the MathML source ions with more than 4 heavy atoms (m/z > 60 u)
dc.language.isoen
dc.publisherElsevier
dc.subject.enchemistry
dc.subject.enTitan
dc.subject.enAtmospheres
dc.subject.enIonospheres
dc.title.enProduction of neutral species in Titan's ionosphere through dissociative recombination of ions
dc.typeArticle de revue
dc.identifier.doi10.1016/j.icarus.2012.02.032
dc.subject.halPlanète et Univers [physics]/Astrophysique [astro-ph]/Planétologie et astrophysique de la terre [astro-ph.EP]
dc.subject.halPhysique [physics]/Astrophysique [astro-ph]/Planétologie et astrophysique de la terre [astro-ph.EP]
bordeaux.journalIcarus
bordeaux.page254-266
bordeaux.volume219
bordeaux.issue1
bordeaux.peerReviewedoui
hal.identifierhal-00677447
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00677447v1
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