FUV Photoionization of Titan Atmospheric Aerosols
| Autor: | Dusan K. Bozanic, Laurent Nahon, Sarah Tigrine, Nathalie Carrasco, Gustavo A. Garcia |
|---|---|
| Přispěvatelé: | PLANETO - LATMOS, Laboratoire Atmosphères, Milieux, Observations Spatiales (LATMOS), Sorbonne Université (SU)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS), Synchrotron SOLEIL (SSOLEIL), 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.), Vinča Institute of Nuclear Sciences, University of Belgrade [Belgrade], European Project: 636829,H2020,ERC-2014-STG,PRIMCHEM(2015), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) |
| Rok vydání: | 2018 |
| Předmět: |
010504 meteorology & atmospheric sciences
FOS: Physical sciences Photoionization Astrophysics Electron Radiation laboratory: molecular [methods] 7. Clean energy 01 natural sciences law.invention symbols.namesake law Ionization 0103 physical sciences 010303 astronomy & astrophysics 0105 earth and related environmental sciences Earth and Planetary Astrophysics (astro-ph.EP) Physics [PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph] [SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph] Astronomy and Astrophysics atmospheres [planets and satellites] Synchrotron molecular processes Atmosphere of Earth Beamline 13. Climate action Space and Planetary Science symbols laboratory: solid state [methods] planetary systems [ultraviolet] Titan (rocket family) atmospheric effects Astrophysics - Earth and Planetary Astrophysics |
| Zdroj: | The Astrophysical Journal The Astrophysical journal letters The Astrophysical journal letters, Bristol : IOP Publishing, 2018, 867 (2), pp.art.164. ⟨10.3847/1538-4357/aae4d8⟩ The Astrophysical journal letters, 2018, 867 (2), pp.art.164. ⟨10.3847/1538-4357/aae4d8⟩ |
| ISSN: | 1538-4357 2041-8205 2041-8213 |
| DOI: | 10.3847/1538-4357/aae4d8 |
| Popis: | International audience; Thanks to the Cassini–Huygens mission, it is now established that the first aerosols in Titan's upper atmosphere are found from an altitude of ~1200 km. Once they are formed and through their descent toward the surface, these nanoparticles are submitted to persistent far-ultraviolet (FUV) radiation that can reach lower atmospheric layers. Such an interaction has an impact, especially on the chemistry and charge budget of the atmospheric compounds. Models are useful to understand this photoprocessing, but they lack important input data such as the photoemission threshold or the absolute photoabsorption/emission cross sections of the aerosols. In order to quantify the photoemission processes, analogs of Titan's aerosols have been studied with the DESIRS FUV beamline at the synchrotron SOLEIL as isolated substrate-free nanoparticles. We present here the corresponding angle-resolved photoelectron spectroscopy data recorded at different FUV photon energies. The results show a very low photoionization threshold (6.0 ± 0.1 eV ~ 207 nm) and very high absolute ionization cross sections (~106 Mb), indicating that FUV photoemission from aerosols is an intense source of slow electrons that has to be taken into account in photochemical models of Titan's atmosphere. |
| Databáze: | OpenAIRE |
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