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. 2015 Jun 8;6:7377. doi: 10.1038/ncomms8377

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(a) Tetragonal crystal structure of BaFe₂As₂ in the presence of the A_1g phonon mode, parametrized by the Fe–As–Fe bond angle α. (b) Schematic of the experimental setup with the incoming infrared (IR) pump (red) and the X-ray probe pulse (blue). The temporal evolution of the diffraction pattern from the photo-excited BaFe₂As₂ single crystal was measured with a CSPAD-140k area detector. Δt is the time delay of the probe pulse with respect to the pump pulse.