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a.) Post-ion/ion reaction mass spectrum following the reaction of cations formed from a mixture of six proteins (see inset for pre-ion/ion reaction mass spectrum of the protein mixture) with anions derived from PFO in Q0. b.) Post-ion/ion product ion spectrum of the protein mixture obtained under the same conditions as for 5a but with the application of a 12 kHz, 7 Vp-p frequency. The asterisks indicate noise peaks.
