DESY 2 articles published in JoVE Chemistry An Experimental Protocol for Femtosecond NIR/UV - XUV Pump-Probe Experiments with Free-Electron Lasers Daniel Rolles1, Rebecca Boll2,3, Benjamin Erk2, Dimitrios Rompotis2, Bastian Manschwetus2 1J.R. Macdonald Laboratory, Department of Physics, Kansas State University, 2Deutsches Elektronen-Synchrotron DESY, 3European XFEL GmbH This protocol describes the key steps for performing and analyzing pump-probe experiments combining a femtosecond optical laser with a free-electron laser in order to study ultrafast photochemical reactions in gas-phase molecules. Chemistry Microfluidic Chips for In Situ Crystal X-ray Diffraction and In Situ Dynamic Light Scattering for Serial Crystallography Yannig Gicquel*1,2, Robin Schubert*3,4,5, Svetlana Kapis3, Gleb Bourenkov6, Thomas Schneider6, Markus Perbandt3,4, Christian Betzel3,4,5, Henry N. Chapman1,2,4, Michael Heymann1,7 1Center for Free Electron Laser Science, DESY, 2Department of Physics, University of Hamburg, 3Institute for Biochemistry and Molecular Biology, Laboratory for Structural Biology of Infection and Inflammation, University of Hamburg, 4The Hamburg Center for Ultrafast Imaging, University of Hamburg, 5Integrated Biology Infrastructure Life-Science Facility at the European XFEL (XBI), 6European Molecular Biology Laboratory, EMBL c/o DESY, 7Department of Cellular and Molecular Biophysics, Max Planck Institute of Biochemistry This protocol describes in detail how to fabricate and operate microfluidic devices for X-ray diffraction data collection at room temperature. Additionally, it describes how to monitor protein crystallization by dynamic light scattering and how to process and analyze obtained diffraction data.
