Journal Article Research Support, Non-U.S. Gov't ultrafast X-ray diffraction Evaluation Study X-ray switching beamline instrumentation coherent phonons ferroelectric switching heat diffusion hybrid pixel X-ray detector jitter nanostructures optical excitation optical pump optical pump X-ray probe optics pulse shortening pump–probe X-ray diffraction sagittal X-ray diffraction surface acoustic waves surface deformation synchrotron radiation thermal transport thin film time-resolved time-resolved X-ray diffraction timing triggering