Reactions of N2+ and N4+ ions with O2 are studied under single-collision conditions in a guided-ion beam mass spectrometer. Reactant ions are formed in a flow tube source to ensure thermalization. N4+ is found to undergo charge transfer to O2 more efficiently than does N2+. The cross section for the latter reaction has a complex shape which is interpreted in terms of vertical transitions to form ground and excited state O2+. For reaction of N4+, the necessity of ligand exchange as an initial step is discussed. Cross sections for several other products, N2O+, O+, NO +, and N+, are measured for the first time in both systems and found to be formed only in endothermic reactions. Evidence is presented that the first three of these products arise from an N2O+ intermediate for both systems. The present results are compared to and contrasted with previous measurements.
|Number of pages||15|
|Journal||Journal of Chemical Physics|
|State||Published - 1991|