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Spectra showing melittin cations prior to (a) and after (b) ion/ion reaction with PDCH anions. Application of -7 VDC during anion injection and reaction time (c) effectively prevents the ion/ion reaction from proceeding. Application of -7 VDC during anion injection time only (d) increases the capture efficiency of the reagent anions, increasing their number density in the trap, which allows the charge reduction reaction to proceed further during the set reaction time.
