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(a) Mutual storage product ion/ion spectrum resulting from the charge inversion ion/ion reaction of mass-selected [PE O-38:5 + H]+ (m/z 752.5) cations and [PDPA – 2H]2− dianions. Note that the mutual storage product ion denoted with an asterisk (*) at m/z 716.5 results from the charge inversion of a precursor ion co-isolated with the m/z 752.5 cation population. (b) MS3 ion-trap CID spectrum of the ion at m/z 750.5 obtained after ion/ion reaction
