VERSATILE ULTRAFAST ELECTRON DIFFRACTION SETUP

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Ultrafast lasers provided the "first light" in sufficiently short pulses to monitor atomic motion on the relevant timescales; below a millionth of a millionth of a second, to literally catch atoms on the fly as in stop-motion photography. However, the spatial resolution in optical microscopy is limited to about the size of a big virus. This is about ten thousand times too coarse to observe the molecular structure at its finest detail, down to its fundamental building blocks - atoms.