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The dynamics following laser-induced molecular photodissociation of gas-phaseCH$_{2}$BrI at 271.6 nm were investigated by time-resolved Coulomb explosionimaging using intense near-IR femtosecond laser pulses. The observeddelay-dependent photofragment momenta reveal that CH$_{2}$BrI undergoes C-Icleavage, depositing 65.6% of the available energy into internal productstates, and that absorption of a second UV photon breaks the C-Br bond ofCH$_{2}$Br. Simulations confirm that this mechanism is consistent with previousdata recorded at 248 nm, demonstrating the sensitivity of Coulomb explosionimaging as a real-time probe of chemical dynamics.

Coulomb explosion imaging of concurrent CH$_{2}$BrI photodissociation dynamics