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Femtosecond time-resolved powder diffraction experiments using hard X-ray free-electron lasers.
C Blome1, Th Tschentscher, J Davaasambuu
1HASYLAB at DESY, Notkestrasse 85, D-22607 Hamburg, Germany. christian.blome@desy.de
Journal of Synchrotron Radiation
|October 22, 2005
Summary
High-brilliance X-ray sources like free-electron lasers (FELs) will revolutionize ultrafast science. Time-resolved single-shot powder diffraction experiments are feasible with FELs, enabling new discoveries.
Area of Science:
- Physics
- Chemistry
- Biology
- Material Research
- Life Sciences
- Ultrafast Science
Background:
- High-brilliance X-ray radiation from free-electron laser (FEL) sources is expected to significantly impact various scientific fields.
- Current ultrafast X-ray diffraction experiments are limited by the X-ray flux of existing sources.
Purpose of the Study:
- To discuss the feasibility of time-resolved single-shot powder diffraction experiments using intense FEL pulses.
- To outline the experimental requirements for such experiments.
Main Methods:
- Estimation of detector count rates for diffraction from a model compound.
- Consideration of a wide q-regime and high resolving power.
- Analysis based on LCLS radiation parameters.
Main Results:
- FELs provide intense, short X-ray pulses (approx. 10(12) photons, 100 fs duration, 10(-3) monochromaticity).
- Single-shot experiments are feasible with LCLS parameters.
- High-resolution powder diffraction may require reducing the FEL radiation bandwidth.
Conclusions:
- FELs will enable new types of ultrafast science experiments, leading to the discovery of new phenomena.
- Time-resolved single-shot powder diffraction is a viable technique with FELs.
- Optimizing FEL bandwidth is crucial for high-resolution diffraction studies.