Ultrafast X-ray diffraction in liquid, solution and gas: present status and future prospects.

Area of Science:

• * Physics
• * Chemistry
• * Structural Biology

Background:

• * Time-resolved X-ray diffraction (TRXRD) uses 100 ps X-ray pulses from synchrotrons to study reaction dynamics and protein structural changes.
• * The development of X-ray free-electron lasers (XFELs) offers significantly shorter pulse durations, higher photon flux, and improved coherence.

Purpose of the Study:

• * To present potential applications of femtosecond X-ray diffraction using XFELs.
• * To highlight the revolutionary impact of XFELs on studying ultrafast dynamics.
• * To explore the prospect of single-molecule diffraction experiments.

Main Methods:

• * Utilizing highly coherent sub-100 femtosecond (fs) X-ray pulses from XFELs.
• * Applying time-resolved X-ray diffraction techniques.
• * Investigating chemical reactions, solvation dynamics, and protein structural transitions.

Main Results:

• * Femtosecond X-ray diffraction experiments will monitor ultrafast reaction dynamics and coherent rovibrational wave packets in real time.
• * XFELs enable enhanced capabilities for studying molecular processes at unprecedented temporal resolution.
• * High photon flux and coherence open possibilities for single-molecule diffraction studies.

Conclusions:

• * XFELs are poised to revolutionize time-resolved diffraction studies of chemical and biological systems.
• * Femtosecond resolution will provide real-time insights into molecular motions and transformations.
• * Future research directions include single-molecule studies and complex dynamic processes.