{"id":5262,"date":"2025-07-02T17:02:24","date_gmt":"2025-07-02T15:02:24","guid":{"rendered":"https:\/\/academiespatiale.fr\/?post_type=tribe_events&p=5262"},"modified":"2025-07-02T17:02:25","modified_gmt":"2025-07-02T15:02:25","slug":"seminaire-oxygen-ion-irradiation-of-titan-aerosol-analogs","status":"publish","type":"tribe_events","link":"https:\/\/academiespatiale.fr\/index.php\/event\/seminaire-oxygen-ion-irradiation-of-titan-aerosol-analogs\/","title":{"rendered":"[S\u00c9MINAIRE] Oxygen ion irradiation of Titan Aerosol Analogs"},"content":{"rendered":"
\n\t

\n\t\t\n\t\t\t10 juillet 2025\t\t<\/span>\n\n\t\t\t\t\t\n\t\t\t\t : \t\t\t<\/span>\n\t\t\t\n\t\t\t\t11h30\t\t\t<\/span>\n\t\t\n\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t–\t\t\t\t<\/span>\n\t\t\t\n\t\t\t\t\t\t\t\n\t\t\t\t\t12h00\t\t\t\t<\/span>\n\t\t\t\n\t\t\t\t\t\t<\/p>\n<\/div>\n\n\n\n

<\/span>
\n

V\u00e9ronique Vuitton, directrice adjointe de l’IPAG (Institut de Plan\u00e9tologie et d’Astrophysique de Grenoble), pr\u00e9sente un s\u00e9minaire intitul\u00e9 \u00ab\u00a0Oxygen ion irradiation of Titan aerosol analogs\u00a0\u00bb. Le s\u00e9minaire aura lieu \u00e0 11h30 au LATMOS.<\/p>\n\n\n\n

\n
\n
\n\n\n\n

Jeudi 10 juillet 2025 \u00e0 11h30<\/strong><\/p>\n\n\n\n

LATMOS
Salle 2202
11, boulevard d’Alembert
Guyancourt<\/p>\n\n\n\n

En visioconf\u00e9rence<\/strong>
https:\/\/cnrs.zoom.us\/j\/97562357072?pwd=hoxS0DBjm869mVVQBamGbNQVy6ymk4.1<\/a><\/p>\n\n\n\n

\n<\/div>\n\n\n\n
\n
\"\"<\/figure>\n<\/div>\n<\/div>\n\n\n\n

The Cassini-Huygens mission detected macromolecules, attributed to polycyclic aromatic (nitrogen bearing) hydrocarbons (PANHs) in Titan\u2019s upper atmosphere and energetic water ions, originating from Enceladus\u2019 geysers, in the vicinity of Titan. When entering Titan\u2019s atmosphere, a fraction of the water ions must collide with the macromolecules but the impact on the atmospheric chemistry is unclear.<\/p>\n\n\n\n

In this work, we have irradiated laboratory analogs of Titan\u2019s aerosols with energetic water ions, at ion accelerators located in France and Hungary. During the irradiation, we monitored the infrared absorption spectra of the samples and we measured the material sputtered into the gas phase with a mass spectrometer. We subsequently obtained the elemental, isotopic and molecular content of the samples at the end of the irradiation with mass spectrometers.<\/p>\n\n\n\n

We show that the irradiation of the samples leads to their destruction, through both formation of new macromolecules in the solid phase and sputtering of light species into the gas phase. Thousands of molecules with m\/z up to 500 are detected in the solid phase and are attributed to PANHs. Moreover, a fraction of the incoming oxygen implants in this complex mixture. At the same time, N2<\/sub>, small nitriles and hydrocarbons, are sputtered into the gas phase, throughout the irradiation. These experimental results suggest that ion deposition in Titan\u2019s atmosphere may play a role in the rapid molecular growth occurring at high altitudes as well as in the formation of some gas phase trace species.<\/p>\n\n\n\n

Plus d’infos
\u2192 Oxygen ion irradiation of Titan aerosol analogs \u2013 Institut Pierre-Simon Laplace<\/a><\/p>\n\n\n\t

\n\t\t
\n\t\t\t