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The fragmentation dynamics of 2,6- and 3,5-difluoroiodobenzene after iodine4$d$ inner-shell photoionization with soft X-rays are studied using coincidentelectron and ion momentum imaging. By analyzing the momentum correlationbetween iodine and fluorine cations in three-fold ion coincidence events, wecan distinguish the two isomers experimentally. Classical Coulomb explosionsimulations are in overall agreement with the experimentally determinedfragment ion kinetic energies and momentum correlations and point towarddifferent fragmentation mechanisms and time scales. While most three-bodyfragmentation channels show clear evidence for sequential fragmentation on atime scale larger than the rotational period of the fragments, the breakup intoiodine and fluorine cations and a third charged co-fragment appears to occurwithin a few hundred femtoseconds -- a time scale larger than the rotationalperiod of the fragments, the breakup in other channels appears to occur withina few hundred femtoseconds.

Isomer-Dependent Fragmentation Dynamics of Inner-Shell Photoionized Difluoroiodobenzene