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À. , T. F. Bell, U. S. Inan, and M. Platino, Centre d'Etudes des Environnements Terrestres et Planétaires, Centre National de la Recherche Scientifique, Université Versailles Saint- Quentin-en-Yvelines, 10 avenue de l'Europe, F-78140, P. M. E. Décréau, Laboratoire de Physique et Chimie de l'Environnement , Centre National de la Recherche Scientifique, 3 A avenue de la Recherche Scientifique, F-45071 Orléans cedex 02