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Avoiding multiphoton artifacts

Ultrafast pump-probe crystallography experiments with x-ray free-electron lasers have now resolved structural changes in several light-sensitive proteins. A major experimental question has been how to set up the pump laser to increase the occupancy of excited states in the crystal but not cause multiphoton excitation. Grünbein et al. studied how incident laser pulses would be…

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John Bolton calls Trump unskilled as president plans Phoenix speech in the middle of pandemic– live

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