Abstract
Beamline 8 is a bending magnet beamline at Synchrotron Light Research Institute (SLRI) in Thailand and has been opened for synchrotron users to perform X-ray absorption fine structure (XAFS) spectroscopy since 2006. The beamline was originally equipped with a double crystal monochromator (DCM) using a vertical entrance slit in order to limit divergence of a white beam, thus optimizing photon energy resolution at a cost of photon flux. In 2016 the beamline was upgraded with a vertical collimating mirror to decrease beam divergence. The maximum photon flux is consequently increased to 3 × 1011 photons s−1 (100 mA)−1 at the phosphorus K-edge (2145.5 eV). This enhances beamline utilization for phosphorus speciation and analysis of local atomic structures in diluted samples (>50 mg/kg of phosphorus). Furthermore, the highest photon energy of the beamline has been extended from 10 keV to 13 keV, enabling several heavy elements such as lead to be studied while the lowest photon energy currently covers the sodium K-edge. To demonstrate improved XAFS performance, XAFS experiments were carried out on selected samples (NaCl, Na3PO4·12H2O, PbO, PbO4, PbCO3, PbS, soil, and historical paint); quality of the experimental spectra was evaluated in terms of signal-to-noise ratio and appearance of XAFS characteristic features.
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