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Electron transfer ion/ion reactions of doubly charged tryptic peptide HGTVVLTALGGILK from myoglobin with azobenzene radical anions (a) with no activation; (b) with multi-frequency activation, an amplitude of 2.8 Vp-p; (c) with multi-frequency activation, an amplitude of 3.0 Vp-p; (d) with multi-frequency activation, an amplitude of 3.2 Vp-p. (The peaks labeled with asterisks are present during the isolation.)
