2019
DOI: 10.1126/sciadv.aaw5841
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Low-temperature synthesis of polycyclic aromatic hydrocarbons in Titan’s surface ices and on airless bodies

Abstract: Model ices related to Titan’s surface show that polycyclic aromatic hydrocarbons are not solely formed in Titan’s atmosphere.

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Cited by 41 publications
(44 citation statements)
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“…The authors demonstrated the formation of polymeric residues after warming up irradiated ices whose infrared features correspond, for the most part, to those observed by the CIRS and VIMS (Visible and Infrared Mapping Spectrometer) instruments in the aerosol layer present in the stratosphere of Titan. Although recent experimental works focused on the fate of acetylene (Abplanalp et al., 2019) or N 2 /CH 4 ices (Vasconcelos et al., 2020), no study has been performed on the fate of benzene ices at such stratospheric altitudes. As benzene is expected to condense below 100 km, that is, at altitudes mainly impacted by solar UV photons λ > 230 nm (Gudipati et al., 2013; Lavvas et al., 2008; Wilson, 2004), understanding the evolution of pure benzene ices submitted to low‐energy photons is essential in identifying its subsequent contribution to the formation of aerosols that will participate in the organic layer that covers Titan's surface.…”
Section: Introductionmentioning
confidence: 99%
“…The authors demonstrated the formation of polymeric residues after warming up irradiated ices whose infrared features correspond, for the most part, to those observed by the CIRS and VIMS (Visible and Infrared Mapping Spectrometer) instruments in the aerosol layer present in the stratosphere of Titan. Although recent experimental works focused on the fate of acetylene (Abplanalp et al., 2019) or N 2 /CH 4 ices (Vasconcelos et al., 2020), no study has been performed on the fate of benzene ices at such stratospheric altitudes. As benzene is expected to condense below 100 km, that is, at altitudes mainly impacted by solar UV photons λ > 230 nm (Gudipati et al., 2013; Lavvas et al., 2008; Wilson, 2004), understanding the evolution of pure benzene ices submitted to low‐energy photons is essential in identifying its subsequent contribution to the formation of aerosols that will participate in the organic layer that covers Titan's surface.…”
Section: Introductionmentioning
confidence: 99%
“…To identify individual molecules prepared during the exposure of the acetylene‐ammonia ices to ionizing radiation, photoionization reflectron time‐of‐flight mass spectrometry (PI‐ReToF‐MS) was exploited during the TPD phase. This method represents a unique isomer‐selective approach of photoionizing and discriminating molecules in the gas phase based on distinct adiabatic ionization energies (IE) of structural isomers (Figure 2, Table S9) by systematically tuning the photon energies above and below the IE of the isomer(s) of interest [2,51,71] . The sublimation profiles report the ion counts versus temperature of distinctive mass‐to‐charge ratios (m/z) (Figure 4).…”
Section: Resultsmentioning
confidence: 99%
“…For the last decade, the elucidation of the fundamental reaction pathways leading to structural isomers – molecules with the same molecular formula, but distinct connectivities of atoms – of complex organic molecules (COMs) in the interstellar medium (ISM) has received considerable interest from the astrochemistry and physical chemistry communities [1–3] . This is because structural isomers have been recognized as tracers of physical and chemical conditions of, e. g., cold molecular clouds like TMC‐1 and of star‐forming regions like SgrB2, which are used to test chemical models through astrochemical modeling combined with astronomical observations [4] .…”
Section: Introductionmentioning
confidence: 99%
“…25 Alternatively, resonance-enhanced multiphoton ionization (REMPI) followed by a mass-resolved detection in a ReTOF-MS often selectively ionizes individual isomers of, for example, polycyclic aromatic molecules upon their sublimation (Figure 4). 3…”
Section: Introductionmentioning
confidence: 99%