Energy dependences of reactions between some atomic ions and SF6, and reevaluation of appearance potentials (SF+5/SF6) and D(SF5–F)

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Abstract
The reactions of Ar+, N+, and Kr+ with SF6 have been investigated using a selected ion flow drift tube in the energy regime from thermal to a few eV relative kinetic energy of the reactants, KEcm, and the reaction of Xe+ with SF6 from 2 to 5 eV, KEcm, SF+5 is the dominant ionic product in all cases with the exception of the endoergic Xe+ reaction, where SF+3 was observed to be the product ion, the rate coefficient increasing dramatically with KEcm. The reaction involving Ar+ and N+ are fast (k∼10−9 cm3 s−1) and vary only slightly with energy. In the case of Kr+ the 2P3/2 state reacts fast (k∼6×10−10 cm3 s−1), while the 2P1/2 state is about an order of magnitude less reactive. The finding of the Kr+ (2P3/2) reaction leads to values AP (SF+5/SF6) ≤14.0 eV and D(SF5–F)=3.83±0.1 eV.