Laboratory studies of molecular growth in the titan ionosphere (Articolo in rivista)

Type
Label
  • Laboratory studies of molecular growth in the titan ionosphere (Articolo in rivista) (literal)
Anno
  • 2009-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1021/jp9050353 (literal)
Alternative label
  • Thissen R. (1); Vuitton V. (1); Lavvas P. (2); Lemaire J. (3); Dehon C. (3); Dutuit O. (1); Smith M. A. (2,4); Turchini S. (5); Catone D. (5); Yelle R. V. (1,2); Pernot P. (3); Somogyi A. (4); Coreno M. (6) (2009)
    Laboratory studies of molecular growth in the titan ionosphere
    in The journal of physical chemistry. A. (Online)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Thissen R. (1); Vuitton V. (1); Lavvas P. (2); Lemaire J. (3); Dehon C. (3); Dutuit O. (1); Smith M. A. (2,4); Turchini S. (5); Catone D. (5); Yelle R. V. (1,2); Pernot P. (3); Somogyi A. (4); Coreno M. (6) (literal)
Pagina inizio
  • 11211 (literal)
Pagina fine
  • 11220 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 113 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#note
  • http://dx.doi.org/10.1021/jp9050353 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • (1) Université J. Fourier, France; (2) Lunar and Planetary Laboratory, University of Arizona; (3) Université Paris-Sud; (4) Department of Chemistry and Biochemistry, University of Arizona; (5) CNR-ISM, Italy; (6) CNR-IMIP, Elettra Sincrotrone, Italy (literal)
Titolo
  • Laboratory studies of molecular growth in the titan ionosphere (literal)
Abstract
  • Experimental simulations of the initial steps of the ion-molecule reactions occurring in the ionosphere of Titan were performed at the synchrotron source Elettra in Italy. The measurements consisted of irradiating gas mixtures with a monochromatic photon beam, from the methane ionization threshold at 12.6 eV, up to and beyond the molecular nitrogen dissociative ionization threshold at 24.3 eV. Three gas mixtures of increasing complexity were used: N2/CH4 (0.96/0.04), N2/CH4/C2H2 (0.96/0.04/0.001), and N2/CH4/C2H2/C2H4 (0.96/0.04/0.001/0.001). The resulting ions were detected with a high-resolution (1 T) FT-ICR mass spectrometer as a function of time and VUV photon energy. In order to interpret the experimental results, a Titan ionospheric model was adapted to the laboratory conditions. This model had previously allowed the identification of the ions detected in the Titan upper atmosphere by the ion neutral mass spectrometer (INMS) onboard the Cassini spacecraft. Comparison between observed and modeled ion densities validates the kinetic model (reactions, rate constants, product branching ratios) for the primary steps of molecular growth. It also reveals differences that we attribute to an intense surface chemistry. This result implies that heterogeneous chemistry on aerosols might efficiently produce HCN and NH3 in the Titan upper atmosphere. (literal)
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