Figure 2.

Newton diagrams for the breakup of (a) 1-IP^2+/3+ and (b) 2-IP^2+/3+ into (I⁺ + CH⁺₃ + C₂H₄/C₂H⁺₄). The correlation of I⁺ and CH⁺₃ has been calculated using a 2-fold contingent covariance analysis, wherein the momentum of the third fragment is deduced through momentum conservation in the center-of-mass (COM) frame. Three dissociation channels that contribute are²⁸ (I) sequential and (II) concerted three-body breakup of IP³⁺ and (III, IV) sequential three-body breakup of IP²⁺. In panels (c,d), the signals from the (III) sequential breakup of IP²⁺, where I⁺ is the primary fragment, have been separated while (e,f) show the isolated signals that correspond to (IV) sequential breakup of IP²⁺ with a primary CH⁺₃ product. Each panel is normalized separately.