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Area of Science:

  • Chemical Physics
  • Materials Science
  • Spectroscopy

Background:

  • Studying transient species in liquid phase reactions requires high time resolution and sensitivity.
  • Traditional X-ray spectroscopy methods often lack the necessary flux or temporal resolution for dynamic processes.

Purpose of the Study:

  • To develop and implement an efficient nonresonant X-ray emission spectroscopy (XES) technique for transient species in liquids.
  • To achieve high flux and picosecond-to-microsecond time resolution for tracking photoexcited systems.

Main Methods:

  • Microfocusing of synchrotron undulator radiation (5-12 keV) using beryllium compound refractive lenses.
  • Overlapping the X-ray microbeam with a high-repetition-rate optical laser on a fast-moving liquid jet.
  • Utilizing a dispersive spectrometer geometry for X-ray emission spectroscopy.

Main Results:

  • Achieved usable flux above 10^15 photons/s at 8 keV on target.
  • Enabled tracking of photoexcited systems in the liquid phase with time resolutions from tens of picoseconds to microseconds.
  • Captured the full emission spectrum, including weak valence-to-core signals sensitive to electronic properties.

Conclusions:

  • The developed microfocused XES technique is efficient for studying transient species in liquids.
  • This method provides crucial insights into chemically relevant electronic properties of dynamic systems.
  • The high flux and time resolution open new avenues for ultrafast chemical dynamics research.