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We report gas-phase reactions of free iron-oxide clusters, Fe_nO_m^+, and their Ar adducts with methane in the context of chemical processes in Mars’ atmosphere. Methane activation was observed to pro...duce Fe_nO_mCH_2^+/Fe_nO_mCD_2^+ and Fe_nO_mC^+, where the reactivity exhibited size and composition dependence. For example, the rate coefficients of methane activation for Fe_3O^+ and Fe_4O^+ were estimated to be 1 × 10^<−13> and 3 × 10^<−13> cm^3 s^<−1>, respectively. Based on these reaction rate coefficients, the presence of iron-oxide clusters/particles with a density as low as 10^7 cm^<−3> in Mars’ atmosphere would explain the rapid loss of methane observed recently by the Curiosity rover.続きを見る
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Mendeley出力
