Reaction Enthalpies for M⁺L = M⁺ + L, Where M⁺ = Na⁺ and K⁺ and L = Acetamide, N-Methylacetamide, N,N-Dimethylacetamide, Glycine, and Glycylglycine, from Determinations of the Collision-Induced Dissociation Thresholds

With electrospray (ES), ions present in solution can be transferred to the gas phase. The method provides unique opportunities for studies of hitherto inaccessible ions. Collision-induced dissociation threshold measurements of gas phase ions produced by ES are described. The thresholds for the reactions M + L = M + + L, where M + is Na + or K + and L is acetone, dimethyl sulfoxide, acetamide, N -methylacetamide, N, N -dimethylacetamide, glycine, glycinamide, succinamide, and glycylglycine, were determined. Enthalpy changes for the reaction were derived from these data.