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. Author manuscript; available in PMC: 2018 Jun 19.
Published in final edited form as: Phys Rev Lett. 2018 Mar 30;120(13):133203. doi: 10.1103/PhysRevLett.120.133203

FIG. 1.

FIG. 1

(a) Experimental setup. The incoming XFEL pulses are focused onto the liquid jet. The simulated x-ray emission is detected using a flat analyzer crystal and a position sensitive 2d detector. (b) Sketch of stimulated x-ray emission. The arrows represent incoming (green) and emitted (red) photons, while the circles indicate the excited (filled) and nonexcited (open) Mn ions respectively. (c) Detected number of photons in the Mn Kα1 region (5 eV integration window) as a function of the nominal incoming XFEL pulse energy for the 5M MnCl2 solution. The actual pulse energy on target is ~20% of the nominal pulse energy shown in the figure. The 50 strongest shots in each 0.1 mJ interval are shown in orange, all other shots in black.