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New evaluation of N+, N2+ and N2++ ion-molecule reactions relevant for the chemistry of Titan's ionosphere

Christian Alcaraz 1 Odile Dutuit 2 Roland Thissen 2 H. Soldi-Lose 2, 3 Jan Zabka 4 P. Francheschi 5 Olivier Witasse 6 Cyril Simon 7 Jean Lilensten 7
1 LURE - Laboratoire pour l'Utilisation du Rayonnement Electromagnétique (LURE)
2 Laboratoire de Chimie Physique
3 Institut für Chemie
4 J. Heyrovský Institute of Physical Chemistry
5 Dipartimento di Fisica [Povo]
6 ESTEC - European Space Research and Technology Centre
7 LPG - Laboratoire de Planétologie de Grenoble
Abstract : In the next weeks and years, the Cassini-Huygens mission will bring some new discoveries on the upper atmosphere of Titan. In this context, it is important to well caracterize the ion production and decay processes for a good understanding of the ionosphere chemistry. In Titan's ionosphere, the dissociative and non-dissociative photoionisation of N2 by solar vacuum ultra-violet are the principal processes responsible for the production of N+, N+2 and N++ 2 primary ions during the day. We will first discuss how these processes can lead to species with internal excitation (electronic and/or vibrational) and also with translational energy [1-3]. The subsequent reactions of these primary ions have been measured in laboratory experiments [1,4] and compared to the literature values [5-7] used in ionospheric models. We will show how the rate constants and the branching ratios to secondary products can be strongly affected by the primary ion internal and translational energy. Consequences on the ionospheric models are discussed.
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Conference papers
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https://hal-insu.archives-ouvertes.fr/insu-00366579
Contributor : Béatrice Pibaret-Bourdon <>
Submitted on : Monday, March 9, 2009 - 10:06:41 AM
Last modification on : Wednesday, December 23, 2020 - 3:04:03 PM

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  • HAL Id : insu-00366579, version 1

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Christian Alcaraz, Odile Dutuit, Roland Thissen, H. Soldi-Lose, Jan Zabka, et al.. New evaluation of N+, N2+ and N2++ ion-molecule reactions relevant for the chemistry of Titan's ionosphere. EGU General Assembly 2005, Apr 2005, Vienne, Austria. ⟨insu-00366579⟩

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