Mid- and far-infrared absorption spectroscopy of Titan’s aerosols analogues

Autor: Carrie M. Anderson, Cyril Szopa, Paul Dumas, Guy Cernogora, Sandrine Vinatier, Alexandre Giuliani, Nathalie Carrasco, Ahmed Mahjoub, Jean-Jacques Correia, Thomas Gautier
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), Laboratoire d'études spatiales et d'instrumentation en astrophysique (LESIA), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Synchrotron SOLEIL (SSOLEIL), Centre National de la Recherche Scientifique (CNRS), NASA Goddard Space Flight Center (GSFC), 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), CNRS (PNP) [ANR-09-JCJC-0038], SOLEIL synchrotron facility [20100103]
Rok vydání: 2012
Předmět:
Zdroj: Icarus
Icarus, 2012, 221 (1), pp.320-327. ⟨10.1016/j.icarus.2012.07.025⟩
Icarus, Elsevier, 2012, 221 (1), pp.320-327. ⟨10.1016/j.icarus.2012.07.025⟩
ISSN: 0019-1035
1090-2643
DOI: 10.1016/j.icarus.2012.07.025
Popis: International audience; In this work we present mid- and far-Infrared absorption spectra of Titan's aerosol analogues produced in the PAMPRE experimental setup. The evolution of the linear absorption coefficient ε (cm-1) is given as a function of the wavenumber. We provide a complete dataset regarding the influence that the concentration of methane vapor in the gas mixture has on the tholin spectra. Among other effects, the intensity of the 2900 cm-1 (3.4 μm) pattern (attributed to methyl stretching modes) increases when the methane concentration increases. More generally, tholins produced with low methane concentrations seem to be more amine based polymers, whereas tholins produced with higher methane concentrations contains more aliphatic carbon based structures. Moreover, it is shown that the position of the bands around 2900 cm-1 depends on the chemical environment of the methyl functional group. We conclude that the presence of these absorption bands in Titan's atmosphere, as measured with the VIMS instrument onboard Cassini is in agreement with an aerosol contribution. We also compare the far-infrared spectrum of tholin to spectra of Titan's aerosols derived from recent Cassini-CIRS observations displaying many similarities, particularly with absorption bands at 325 cm-1, 515 cm-1, and the methyl attributed 1380 cm-1 and 1450 cm-1 bands.
Databáze: OpenAIRE
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