Abstract
Benzene cation is a prototypical complex system that exhibits ultrafast conical intersections of different electronic states located close to the Franck-Condon region, yet little information is available about the dynamics of the cationic excited states. Here we utilize femtosecond time-resolved strong field ionization-photo fragmentation (SFI-PF) method to prepare and probe the electronic states of benzene cations. The transient of both the parent ion and the daughter ions are obtained, which present distinct behaviors at different pulse energies of the SFI laser. The results provide the first experimental evidence of B2E2g-X2E1g ultrafast relaxation of benzene cation, which occurs in about 250-270 fs. Our study should pave the way to revealing the ultrafast photochemistry of complex molecular cations.
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