Skip to Main content Skip to Navigation
Theses

Etude spectroscopique et chimique de la surface du satellite Io

Abstract : The aim of this study is to contribute to a better understanding of Io's surface chemical composition. For this purpose, we combined a thermochemical model of Ionian volcanic gases with a spectroscopic and chemical experimental study of low temperature condensed molecules.
The thermochemical study is carried out using an improved volcanic gases model, in order to predict the most probable molecules ejected by Io's volcanoes and to follow them during their cooling and the condensation of some of them.
The experimental study concerns disulfur monoxide, S2O, a major component predicted by the thermochemical model, and its polymer, polysulfur oxide. We reproduced S2O low temperature condensation, followed its polymerization and measured its infrared spectra in laboratory, under conditions of temperature, pressure, mixing with SO2 and UV-visible radiation simulating Ionian ones.
On the one hand, this study improves our knowledge of S2O and of its polymerization mechanism and gives a better idea of polysulfur oxide's structure. On the other hand, our experiments and our spectroscopic results compared to Io's infrared and visible spectra lead us to the conclusion that S2O can not be responsible for red volcanic deposits on Io and that Io's surface is probably mainly composed of sulfur dioxide and a mixture of sulfur S8 and sulfur polymer. To these dominant components, some polysulfur oxide could be added, possibly localized in more restricted volcanic areas.
Document type :
Theses
Complete list of metadata

https://tel.archives-ouvertes.fr/tel-00067964
Contributor : Donia Baklouti <>
Submitted on : Wednesday, May 10, 2006 - 10:25:42 AM
Last modification on : Friday, November 6, 2020 - 3:44:16 AM
Long-term archiving on: : Saturday, April 3, 2010 - 9:43:09 PM

Identifiers

  • HAL Id : tel-00067964, version 1

Collections

UJF | CNRS | INSU | OSUG | UGA

Citation

Donia Baklouti. Etude spectroscopique et chimique de la surface du satellite Io. Autre. Université Joseph-Fourier - Grenoble I, 2006. Français. ⟨tel-00067964⟩

Share

Metrics

Record views

438

Files downloads

2499