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With the development of X‐ray free‐electron lasers (XFELs), producing pulses of femtosecond durations comparable with the coherence times of X‐ray fluorescence, it has become possible to observe intensity–intensity correlations due to the interference of emission from independent atoms. This has been used to compare durations of X‐ray pulses and to measure the size of a focusedX‐ray beam, for example...
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