The FemtoSpeX facility of the BESSY II storage ring is dedicated to ultrafast optical-pump & soft x-ray probe experiments. Experimental end-stations for experiments in transmission, reflection, and diffraction geometry are available.
Pontius, N., Holldack, K., Schüßler-Langeheine, C., Kachel, T., & Mitzner, R. (2016). The FemtoSpeX facility at BESSY II. Journal of Large-Scale Research Facilities JLSRF, 2. https://doi.org/10.17815/jlsrf-2-71