ABSTRACT Energy‐dispersive X‐ray absorption spectroscopy (ED‐XAS) enables microsecond time‐resolved operando investigations, furnishing critical atomic and electronic structural insights into nonequilibrium states within complex systems. This technique is distinguished by three key advantages: high data acquisition speed, a small focal spot with high photon flux, and exceptional stability in both energy scale and focal spot position during measurements. The ED‐XAS beamline (BL05U) at the Shanghai Synchrotron Radiation Facility (SSRF) is China's first ED‐XAS beamline with key parameters: photon flux of 2.52 × 10 12 photons/s·300 eV BW@7.2 keV, X‐ray energy range of 5–25 keV, beam size of 3.52 μm (H) × 21.56 μm (V) at the sample position, and time resolution of tens of microseconds—realized through 1D/2D position‐sensitive detectors (PSDs) with frame rates up to 400 kHz. This paper systematically presents the performance of BL05U across frontier application scenarios in time‐resolved ED‐XAS, hard X‐ray magnetic circular dichroism (XMCD), extreme‐condition ED‐XAS, and pump‐probe ED‐XAS, along with their typical applications in addressing challenging scientific questions in materials science, chemistry, and physics.
Liu et al. (Mon,) studied this question.