The ring-breaking dynamics of ${\mathrm{C}}_6{\mathrm{H}}_6$ in its three dimers $[{\left({\mathrm{C}}_6{\mathrm{H}}_6\right)}_2,$ ${\mathrm{C}}_6{\mathrm{H}}_6\mathrm{Ar},$ and ${\mathrm{C}}_6{\mathrm{H}}_6\mathrm{Kr}]$ are investigated by performing three-body coincidence measurements after interaction with a strong femtosecond laser. The measurements enabled the observation of three ring-breaking channels, resulting in products of ${\mathrm{C}}_1{\mathrm{H}}_3^{+}+{\mathrm{C}}_5{\mathrm{H}}_3^{+},$ ${\mathrm{C}}_2{\mathrm{H}}_3^{+}+{\mathrm{C}}_4{\mathrm{H}}_3^{+},$ and ${\mathrm{C}}_3{\mathrm{H}}_3^{+}+{\mathrm{C}}_3{\mathrm{H}}_3^{+}$ with the neighbor ions. Additionally, kinetic energies from intra- and intermolecular fragmentation are extracted. By using the neighbor ion as a reference, it is found that the lifetimes of corresponding dissociation states have a significant impact on the final angular distributions of the fragments. The vibration excitation of molecules induced by neighboring ions during the repelling process alters the relative ratio between the three observed ring-breaking channels. By examining the ring-breaking dynamics of aromatic molecules in different environments, this study provides valuable insights into molecular fragmentation in complex systems.

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• Atomic & molecular clusters
• Atomic & molecular processes in external fields
• Laser-cluster interaction
• Photodissociation
• Ultrafast phenomena