uXAS/uXES

Contact person: Olivier Mathon mathon@esrf.fr

A unique μXAS/μXES setup is available at ID24-DCM to study complex and diluted systems at ambient conditions, at low temperature or at high pressure. It combines high spatial resolution (500 nm FWHM) and high energy resolution fluorescence detection measured through a 5-crystal-analysers spectrometer.  The beamline has also recently received and integrated a new 7-elements SDD fluorescence detector for PFY XAS measurements. Combined with the high flux of ID24-DCM, all these instruments can be used to lower the detection limit down to the ppm level (or below depending on the matrix). It is particularly suited for natural sample related to geo and environmental sciences, but all applications requiring HERFD, XES, VtC or RIXS are welcome. Figures  below present the setup and one example of XANES recorded on a natural ultra-diluted sample.

Figure 6: XAS/XES setup. Top right data, Ce L₃ edge in natural apatite recorded simultaneously in PFY and HERFD mode (courtesy of C. Bonnet/M. Munoz)

Figure 7: Pt L₃ XANES recorded on a natural FeMn oceanic crust sampled in HERFD mode. The Pt concentration is 2 ppm (courtesy of J. Liao/A. Koschinsky).

Note also , that the μXAS/μXES setup is now equipped with a dynaflow cryostat specially designed to protect the sample during μXES measurements.

Left panel: Dynaflow cryostat combined to the μXES station. Right panel: Sample holder can afford up to twelve 5 mm pellets or 1-inch samples.