All H3O+ reactions proceed by proton transfer, non-dissociative for all compounds, except for 2-methyl-butanal, where two minor channels resulting from fragmentation after protonation are observed.
Association is the only pathway in the NO+/MVK and NO+/glyoxal reaction. Hydride ion transfer is the major process occurring in all the other NO+ reactions. Elimination of CHO for pivaldehyde and association for MaCR are also non-negligible channels in their reaction with NO+.
All O2+ reactions result in the parent cation by charge transfer and in at least one fragment ion.
Hydration of the product ions has been investigated by adding water vapor in the reaction zone. A method is proposed to derive the three-body association rate constants of the product ions with water and to estimate the rate constants of the reactions of the hydrated precursor ions H3O+·H2O and NO+·H2O with the reactants.