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TheMEX2 beamlineis a bend magnet source X-ray absorption spectroscopy beamline covering the energy range of 1.7 to 3.3 keV, specifically targeting the elements phosphorous, sulfur, chlorine, and silicon. A design goal of MEX2 is to provide a large (3 mm V x 5 mm H), collimated (i.e. not focussed) homogeneous, low-flux density beam suitable for analysis of homogeneous, beam-sensitive samples.
MEX2 offers simultaneous drain current and fluorescence-mode analysis under high vacuum (1E-5) for solid samples or fluorescence-mode for liquid samples under a helium atmosphere. For solids, powder samples are thinly spread on carbon tape already adhered to the sample holder, allowing up to 30 samples to be mounted onto one holder. This loading technique is especially efficient for environmental scientists measuring soils.
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MEX2 User cabin
Note: In response to requests for a motorised sample rotation stage integrated into the beamline control system, which would double the capacity for automated operation, a motorised stage has been ordered and is scheduled for integration in early 2025.
An example of work conducted at the MEX2 beamline by CSIRO scientists: This study demonstrated that Fe(II)-catalyzed recrystallization significantly improves phosphorus (P) extractability by redistributing it within the mineral structure and onto the mineral surface or into the aqueous solution. The findings have important implications for developing sustainable methods for phosphorus extraction in mining and for managing phosphorus behavior in natural environments.
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Credit: Niloofar Karimian, CSIRO
Link to this study: https://doi.org/10.1021/acs.est.4c03574
Types of measurements
MEX2 can make measurements in:
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Drain current and fluorescence spectra can be collected at the same time.
How to prepare your samples?
MEX2 uses a ruler mounting system that allows many samples to be stacked one above the other. The document below will guide you through the sample preparation for MEX2. We've designed a sample mount kit specifically for MEX2 users, as shown in the picture below.
If you’d like to receive the kit before starting your beamtime, please contact the beamline scientists well in advance, and they will assist you with the process.
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Using the Sample Mounting System for solid or powder MEX2 samples:
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All instructions regarding sample exchange procedures under vacuum and Helium at MEX2 can be found in the link below: