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The rates and outcomes of virtually all photophysical and photochemicalprocesses are determined by Conical Intersections. These are regions ofdegeneracy between electronic states on the nuclear landscape of moleculeswhere electrons and nuclei evolve on comparable timescales and become stronglycoupled, enabling radiationless relaxation channels upon optical excitation.Due to their ultrafast nature and vast complexity, monitoring ConicalIntersections experimentally is an open challenge. We present a simulationstudy on the ultrafast photorelaxation of uracil, which demonstrates a newwindow into Conical Intersections obtained by recording the transientwavepacket coherence during this passage with an x-ray free electron laserpulse. We report two major findings. First, we find that the vibronic coherenceat the conical intersection lives for several hundred femtoseconds and can bemeasured during this entire time. Second, the time-dependent energy splittinglandscape of the participating vibrational and electronic states is directlyextracted from Wigner spectrograms of the signal. These offer a novel physicalpicture of the quantum Conical Intersection pathways through visualizing theirtransient vibronic coherence distributions. The path of a nuclear wavepacketaround the Conical Intersection is directly mapped by the proposed experiment.

Visualizing Conical Intersection Passages via Vibronic Coherence Maps Generated by Stimulated Ultrafast X--Ray Raman Signals