Abstract
Breakup dynamics of ${\mathrm{C}}_{2}\mathrm{H}{{}_{2}}^{3+}$ $\ensuremath{\rightarrow}$ ${\mathrm{H}}^{+}+{\mathrm{H}}^{+}+\mathrm{C}{{}_{2}}^{+}$ induced by 50-keV/u ${\mathrm{Ne}}^{8+}$ ion impact is investigated employing a reaction microscope. All three ionic fragments in the final state are detected in coincidence, and their momentum vectors as well as the kinetic energies are determined. The kinetic-energy correlation spectrum of the two protons displays very rich structures. Utilizing the Newton diagrams and the Dalitz plots, different dissociation mechanisms corresponding to these structures are identified. It was found that, besides the concerted and sequential breakup, fragmentation mechanisms associated with different vibration modes including molecular bending and asymmetric stretching also make significant contributions. We analyzed the correlation between different fragmentation mechanisms and the kinetic-energy release (KER) and found that the sequential process occurs with higher KER while, in contrast, the concerted process mainly contributes to the lower KER. This behavior is entirely opposite to the breakup of the ${\mathrm{CO}}_{2}$ molecule.
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