Fig. 1.

Experimental setup allowing for the use of stochastic X-ray pulses in two-dimensional spectroscopy. The spectral distribution of the incident photons was detected using a thin crystal transmissive spectrometer before they were focused by a movable Be lens stack on the liquid jet sample. The spectral distribution of the emitted X-ray photons was monitored for two X-ray emission lines with one dedicated von Hamos spectrometer, respectively. All spectrometers allow for a single-shot collection of the X-ray spectra with high energy resolution as is shown in the displayed spectra which were acquired for a single SASE pulse (insets)