Resonant X-ray emission spectroscopy using self-seeded hard X-ray pulses at PAL-XFEL

Area of Science:

• Atomic and Molecular Physics
• Materials Science
• Spectroscopy

Background:

• Hard X-ray emission spectroscopy (XES) is crucial for probing electronic structures.
• Narrow bandwidth X-ray pulses are essential for high-resolution XES.
• PAL-XFEL offers self-seeded X-ray pulses for advanced experiments.

Purpose of the Study:

• To commission a resonant X-ray emission spectroscopy experiment using self-seeded hard X-ray pulses.
• To demonstrate the capability of mapping X-ray emission lines with high energy resolution.
• To establish a reference for future XES experiments with narrow bandwidth pulses.

Main Methods:

• Utilized self-seeded hard X-ray pulses from PAL-XFEL.
• Employed a von Hamos spectrometer for X-ray detection.
• Implemented a coordinated scanning scheme involving electron bunch energy, diamond crystal angle, and silicon monochromator.

Main Results:

• Successfully commissioned a resonant X-ray emission spectroscopy experiment.
• Achieved an average X-ray pulse bandwidth of 0.54 eV at 11.223 keV.
• Mapped the Ir Lβ2 X-ray emission lines of IrO2 powder across the Ir L3-absorption edge with a 0.3 eV energy step.

Conclusions:

• The developed method provides a reliable reference for hard X-ray emission spectroscopy experiments.
• The use of narrow bandwidth self-seeded pulses enhances spectral resolution and accuracy.
• This technique is applicable for future pump-probe studies in solid-state and diluted systems.