Abstract
We demonstrate the rotating-crystal method in femtosecond x-ray diffraction. Structural dynamics of a photoexcited bismuth crystal is mapped in a pump-probe scheme by measuring intensity changes of many Bragg reflections simultaneously.
Highlights
Femtosecond x-ray diffraction provides direct insight into structural dynamics of crystalline materials on the length scale of chemical bonds and the ultrashort time scale of atomic motions
Structural dynamics of a photoexcited bismuth crystal is mapped in a pump-probe scheme by measuring intensity changes of many Bragg reflections simultaneously
We have demonstrated the powder diffraction method in a femtosecond optical pump - x-ray probe approach to measure the transient reflectivity of many Bragg reflections simultaneously [3]
Summary
Femtosecond x-ray diffraction provides direct insight into structural dynamics of crystalline materials on the length scale of chemical bonds and the ultrashort time scale of atomic motions. The spatial resolution R is determined by the x-ray wavelength λ and the highest measurable diffraction angle 2Θ: R = λ/ (4π sin Θ). Almost all ultrafast x-ray diffraction experiments have measured individual Bragg reflections at a time from a single crystal with a stationary orientation. We have demonstrated the powder diffraction method in a femtosecond optical pump - x-ray probe approach to measure the transient reflectivity of many Bragg reflections simultaneously [3]. This experiment revealed a unknown concerted transfer of electrons and protons in ammonium sulfate. We realized a rotating crystal experiment on bismuth which is presented in the following
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