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Single-shot absorption measurements have been performed using the multi-keVX-rays generated by a laser wakefield accelerator. A 200 TW laser was used todrive a laser wakefield accelerator in a mode which produced broadband electronbeams with a maximum energy above 1 GeV and a broad divergence of $\approx15$miliradians FWHM. Betatron oscillations of these electrons generated$1.2\pm0.2\times10^6$ photons/eV in the 5 keV region, with a signal-to-noiseratio of approximately 300:1. This was sufficient to allow high-resolutionXANES measurements at the K-edge of a titanium sample in a single shot. Wedemonstrate that this source is capable of single-shot, simultaneousmeasurements of both the electron and ion distributions in matter heated to eVtemperatures by comparison with DFT simulations. The unique combination of ahigh-flux, large bandwidth, few femtosecond duration X-ray pulse synchronisedto a high-power laser will enable key advances in the study of ultra-fastenergetic processes such as electron-ion equilibration.

Single-shot multi-keV X-ray absorption spectroscopy using an ultrashort laser wakefield accelerator source