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Toward a reduction of the bimolecular reaction model for titan's ionosphere

✍ Scribed by Nathalie Carrasco; Sylvain Plessis; Michel Dobrijevic; Pascal Pernot

Publisher
John Wiley and Sons
Year
2008
Tongue
English
Weight
219 KB
Volume
40
Category
Article
ISSN
0538-8066

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✦ Synopsis

Abstract

The aim of this paper is to highlight the skeletal chemistry responsible for the rich ionospheric chemistry observed in Titan's atmosphere. The present database is represented by about 700 ion–molecule reactions, which are not all important to describe the system. Our criterion to reduce the list of reactions is to reproduce a reference mass spectrum within its uncertainties. This reference mass spectrum is obtained with the complete reaction database and with neutral densities optimized for the INMS mass spectrum measured at 1200 km during the T5 flyby. We compared two mechanism reduction methods, brute force screening and global sensitivity analysis. The analysis of the residual scheme with only 35 bimolecular reactions highlights several patterns, concerning in particular ionic growth processes and introduction of nitrogen to the ionic species. Β© 2008 Wiley Periodicals, Inc. Int J Chem Kinet 40: 699–709, 2008

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