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The upgrade of the laser pump time‐resolved X‐ray probes, namely time‐resolved X‐ray absorption spectroscopy (TR‐XAS) and X‐ray diffraction (TR‐XRD), implemented at the Beijing Synchrotron Radiation Facility, is described. The improvements include a superbunch fill, a high‐efficiency fluorescence collection, an efficient spatial overlap protocol and a new data‐acquisition scheme. After upgrade, the adequate TR‐XAS signal is now obtained in a 0.3 mM solution, compared with a 6 mM solution in our previous report. Furthermore, to extend application in photophysics, the TR‐XAS probe is applied on SrCoO2.5 thin film. And for the first time, TR‐XAS is combined with TR‐XRD to simultaneously detect the kinetic trace of structural changes in thin film. [ABSTRACT FROM AUTHOR]

A new setup and commissioning of transient X-ray absorption spectroscopy are described, based on the high-repetition-rate laser pump/X-ray probe method, at the 1W2B wiggler beamline at the Beijing Synchrotron Radiation Facility. A high-repetition-rate and high-power laser is incorporated into the setup with in-house-built avalanche photodiodes as detectors. A simple acquisition scheme was applied to obtain laser-on and laser-off signals simultaneously. The capability of picosecond transient X-ray absorption spectroscopy measurement was demonstrated for a photo-induced spin-crossover iron complex in 6 m M solution with 155 kHz repetition rate. [ABSTRACT FROM AUTHOR]