Laboratory analogues simulating titan's atmospheric aerosols: Compared chemical compositions of grains and thin films
| Autor: | Arnaud Etcheberry, Nathalie Carrasco, Jackie Vigneron, François Jomard, Guy Cernogora |
|---|---|
| Přispěvatelé: | PLANETO - LATMOS, Laboratoire Atmosphères, Milieux, Observations Spatiales (LATMOS), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Institut Universitaire de France (IUF), Ministère de l'Education nationale, de l’Enseignement supérieur et de la Recherche (M.E.N.E.S.R.), Groupe d'Etude de la Matière Condensée (GEMAC), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Centre National de la Recherche Scientifique (CNRS), Institut Lavoisier de Versailles (ILV), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), European Research Council (ERC), European Project: 636829,H2020,ERC-2014-STG,PRIMCHEM(2015) |
| Rok vydání: | 2016 |
| Předmět: |
Earth and Planetary Astrophysics (astro-ph.EP)
Materials science 010504 meteorology & atmospheric sciences Analytical chemistry [SDU.ASTR.EP]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP] FOS: Physical sciences chemistry.chemical_element Astronomy and Astrophysics 01 natural sciences Nitrogen Atmosphere Secondary ion mass spectrometry symbols.namesake chemistry X-ray photoelectron spectroscopy Space and Planetary Science Elemental analysis 0103 physical sciences Radiative transfer symbols Thin film Titan (rocket family) 010303 astronomy & astrophysics Astrophysics - Earth and Planetary Astrophysics 0105 earth and related environmental sciences |
| Zdroj: | Planetary and Space Science Planetary and Space Science, Elsevier, 2016, 128, pp.52-57. ⟨10.1016/j.pss.2016.05.006⟩ Planetary and Space Science, 2016, 128, pp.52-57. ⟨10.1016/j.pss.2016.05.006⟩ |
| ISSN: | 0032-0633 |
| DOI: | 10.1016/j.pss.2016.05.006 |
| Popis: | International audience; Two sorts of solid organic samples can be produced in laboratory experiments simulating Titan's atmospheric reactivity: grains in the volume and thin films on the reactor walls. We expect that grains are more representative of Titan's atmospheric aerosols, but films are used to provide optical indices for radiative models of Titan's atmosphere.The aim of the present study is to address if these two sorts of analogues are chemically equivalent or not, when produced in the same N2-CH4 plasma discharge. The chemical compositions of both these materials are measured by using elemental analysis, XPS analysis and Secondary Ion Mass Spectrometry. The main parameter probed is the CH4/N2 ratio to explore various possible chemical regimes. We find that films are homogeneous but significantly less rich in nitrogen and hydrogen than grains produced in the same experimental conditions. This surprising difference in their chemical compositions could be explained by the efficient etching occurring on the films, which stay in the discharge during the whole plasma duration, whereas the grains are ejected after a few minutes. The higher nitrogen content in the grains possibly involves a higher optical absorption than the one measured on the films, with a possible impact on Titan's radiative models. |
| Databáze: | OpenAIRE |
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