The XAS beamline employs hard X-rays, spanning 5 - 31 keV. Please see the XAS page on the Australian Synchrotron website here for more details on the XAS photon delivery system. The energy range is accessed via three ‘beamline modes’ covering the low (5-9 keV aka Mode 1), medium (9-19 keV aka Mode 2), and high (15-31 keV aka Mode 3) energies, which allows access to most of the periodic table. Note that to setup a beamline mode, or to switch between modes, approximately one day of downtime is required. Therefore, all Mode 1 experiments are scheduled back-to-back, followed by all Mode 2 experiments, then all of Mode 3. Note also that in Mode 1, an additional harmonic rejection mirror (HRM) is required for V, Cr, and Mn K-edges. It takes up to 3 hours to insert and align the HRM, and up to 2 hours to remove. Bear this in mind when you plan your experiments. Consider if, for you, the measurement of V, Cr, and Mn K-edges are better performed at the MEX-1 Beamline.
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If users would like to analyse edges in different energy modes, they MUST submit a separate proposal for each mode. We recommend that separate proposals have the same content but different sample tables, and be designated ‘Part 1,' ‘Part 2,' etc. |
Elements in Red are analysed in Mode 1, Blue are commonly analysed in Mode 2, and Yellow are commonly analysed in Mode 3.
Titanium is only possible under certain circumstances - please contact us, or go to the MEX-1 Beamline.
Copper XANES can be analysed in Mode 1.
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With the two new MEX Beamlines now online, it is important to reflect on the capability overlap between XAS and MEX. For example, operationally, the XAS Beamline is particularly well suited to energies at or and above the Mn K-edge and as such users may prefer to approach the MEX Beamline for the lower energies (MEX covers energies down to about 1.7 keV). Whilst MEX offers less flux than XAS, this should not pose a problem for transmission or moderately dilute samples measured in fluorescence mode (>1000 ppm). |