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Abstract
Pair distribution functions from individual femtosecond X-ray pulses have the potential to elucidate the structure of transient states in matter, such as those found in liquid systems. To demonstrate this possibility an experiment was conducted at the Materials Imaging and Dynamics instrument of European X-ray Free Electron Laser Facility. We utilized the large field of view detector configuration, exploiting single high-flux X-ray pulses of femtosecond duration at 23 keV photon energy. After deconvolution from the pattern termination function, we show here pair distribution functions of liquid water at approximately 260 K. These results demonstrate that current X-ray free electron laser methods can acquire pair distribution functions on the femtosecond timescale that have potential to capture transient state of liquids.