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A narrow distribution of [14Pro+2H]2+ cluster formed from the 50:50 L/D solution is (a) mobility selected and activated with (b) 50V and (c) 120V in the IA2 region. At the relatively low activation voltage (50V), the [14Pro+2H]2+ cluster evaporates neutral monomers. At the higher activation voltage (120V), the doubly charge clusters fission to produce singly charged proline clusters.
