Dissociation of dimethyl sulfide on water ice initiated by low-energy (<20 eV) electrons
Literature Information
Hassan Abdoul-Carime, Léon Sanche
Dimethyl sulfide (CH3SCH3) is the most widespread of biogenic sulfur compounds responsible for sulfur aerosol production in the atmosphere. Here, we show that low-energy electrons, produced by ionization in the upper troposphere, can dissociate DMS and generate a variety of anion fragments, e.g., H−, CH2−, CH3−, S−, SH−, SCH2− and SCH3− as well as their neutral counterparts, e.g., CH3SCH2, HSCH3, SCH3, (CH3)2, CH2CH3, CH4, CH3, respectively. The ions H−, CH2− and CH3− arise from dissociative electron attachment (DEA) below 13 eV and from direct dipolar dissociation above that energy. The other anions, which contain a sulfur atom, appear to be formed only via DEA. The anion desorption yields for CH3SCH3 adsorbed on water ice were measured between 1 and 18 eV. In units of 10−3 anion per incident electron and per cm3, these yields averaged over the 1–18 eV range are 60 (H−), 0.1 (CH2−), 1.0 (CH3−), 1.2 (S−), 0.1 (SH−), 0.1 (SCH2−) and 0.3 (SCH3−).
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