Reactions of O− with N2, N2O, SO2, NH3, CH4, and C2H4 and C2H2− with O2 from 300 °K to relative kinetic energies of ∼2 eV

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Abstract
The energy dependences of the reaction rate constants of O− ions with the neutral species N2, N2O, SO2, NH3, CH4, and C2H4 have been measured from thermal energy to approximately 2 eV relative kinetic energy. The energy dependences of the over‐all reaction rate constants do not fit available theories for collision rate constants. The reaction of O− with C2H4 produces four different negative‐ion product channels, in addition to the associative‐detachment channel. The branching ratios are found to change drastically with reactant energy. The reactions establish the following upper limits on electron affinities: EA(:C=CH2) 2H3) ≳0.4 eV. The reactions also establish an upper limit for the heat of formation of the ion C2H3O− (ΔHf°<−0.62 eV).