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- W651844275 abstract "Electron-induced polymerization processes and charging events that can occur within Titan’s atmosphere or on its surface were simulated using electron irradiation and dissociative electron attachment (DEA) studies of nitrogen-containing organic condensates. The DEA studies probe the desorption of H− from hydrogen cyanide (HCN), acetonitrile (CH3CN), and aminoacetonitrile (NH2CH2CN) ices, as well as from synthesized tholin materials condensed or deposited onto a graphite substrate maintained at low temperature (90–130 K). The peak cross sections for H− desorption during low-energy (3–15 eV) electron irradiation were measured and range from 3 × 10−21 to 2 × 10−18 cm2. Chemical and structural transformations of HCN ice upon 2 keV electron irradiation were investigated using X-ray photoelectron and Fourier-transform infrared spectroscopy techniques. The electron-beam processed materials displayed optical properties very similar to tholins produced by conventional discharge methods. Electron and negative ion trapping lead to 1011 charges cm−2 on a flat surface which, assuming a radius of 0.05 μm for Titan aerosols, is ∼628 charges/radius (in μm). The facile charge trapping indicates that electron interactions with nitriles and complex tholin-like molecules could affect the conductivity of Titan’s atmosphere due to the formation of large negative ion complexes. These negatively charged complexes can also precipitate onto Titan’s surface and possibly contribute to surface reactions and the formation of dunes." @default.
- W651844275 created "2016-06-24" @default.
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- W651844275 date "2015-09-01" @default.
- W651844275 modified "2023-10-16" @default.
- W651844275 title "Electron-molecule chemistry and charging processes on organic ices and Titan’s icy aerosol surrogates" @default.
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- W651844275 doi "https://doi.org/10.1016/j.icarus.2015.06.006" @default.
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