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a) Negative ion nano-electrospray ionization mass spectrum of 9-anthracenecarboxylic acid. b) Ion trap collision-induced dissociation of deprotonated 9- anthracenecarboxylic acid. The ion labeled [R+H2O]− is an ion molecule reaction product formed during the collisional activation period and prior to ejection of the reagent anion, [R]−. c) ETD spectrum derived from the reaction of the reagent anion, [R]−, of 9-anthracenecarboxylic acid with triply protonated KGAILKGAILR.
