  Many recent experimental ultrafast spectroscopy studies have hinted at
non-adiabatic dynamics indicating the existence of conical intersections, but
their direct observation remains a challenge. The rapid change of the energy
gap between the electronic states complicated their observation by requiring
bandwidths of several electron volts. In this manuscript, we propose to use the
combined information of different X-ray pump-probe techniques to identify the
conical intersection. We theoretically study the conical intersection in
pyrrole using transient X-ray absorption, time-resolved X-ray spontaneous
emission, and linear off-resonant Raman spectroscopy to gather evidence of the
curve crossing.
