Figure 5.

Newton diagrams for channel III—the sequential breakup of 1-IP²⁺ (left column) and 2-IP²⁺ (right column) that yields I⁺ + CH⁺₃ and involves the Coulomb explosion into I⁺ + C₃H⁺₇ as the primary step. Fragment momenta are plotted in the COM frame of the parent ion in panels (a,b) and in the COM of the C₃H⁺₇ intermediate in panels (c,d), i.e., the native frame of the secondary dissociation step. Each panel is normalized separately.