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The chemical composition of Titan organic haze is poorly known. To addressthis issue, laboratory analogs named tholins are synthesized, and analyzed bymethods requiring often an extraction process in a carrier solvent. Thesemethods exclude the analysis of the insoluble tholins fraction and assume ahypothetical chemical equivalence between soluble and insoluble fractions. Inthis work, we present a powerful complementary analysis method recentlydeveloped on the DESIRS VUV synchrotron beamline at SOLEIL. It involves a softpyrolysis of tholins at ~230 deg C and an electron ion coincidence analysis ofthe emitted volatiles compounds photoionized by the tunable synchrotronradiation. By comparison with reference photoelectron spectra (PES), thespectral information collected on the detected molecules yields their isomericstructure. The method is more readily applied to light species, while forheavier ones the number of possibilities and the lack of PES reference spectrain the literature limit its analysis. A notable pattern in the analyzed tholinsis the presence of species containing adjacent doubly-bonded N atoms, whichmight be a signature of heterogeneous incorporation of N2 in tholins.

the journal of physical chemistry. a/the journal of physical chemistry. a.

Molecular Isomer Identification of Titan Tholins Organic Aerosols by  Photoelectron/Photoion Coincidence Spectroscopy Coupled to VUV Synchrotron  Radiation