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The unknown ultrafast structural dynamics of C 2 F 4 I 2, depicting possible species involved in the reaction. Before photoexcitation, the C 2 F 4 I 2 molecules present as a mixture of anti (blue) and gauche (green) conformers. Photoinduced primary iodine dissociation depletes each conformer by different portions (purple-bordered box) depending on absorption cross-section and quantum yields. This also leaves the remaining conformational mixture C 2 F 4 I 2 whose anti -to- gauche ratio is perturbed from the dynamic equilibrium (magenta-bordered box).

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