Journal Article Research Support, Non-U.S. Gov't XFEL coherent X-ray diffraction imaging serial femtosecond crystallography EC 3.2.1.17 Muramidase NiO Research Support, N.I.H., Extramural X-ray emission spectroscopy X-ray free-electron laser X-ray free-electron lasers XFELs beam profile coherence coherent diffraction imaging oxidation pulse energy pump and probe single-particle analysis single-particle diffraction three-dimensional morphology three-dimensional reconstruction time-resolved X-ray crystallography ultrafast dynamics wide-angle X-ray diffraction