Performance and status of beamline BL8 at SLRI for X-ray absorption spectroscopy

Abstract

Beamline BL8 of the Synchrotron Light Research Institute (Thailand) is routinely operated for X-ray absorption spectroscopy (XAS) in an intermediate photon energy range (1.25-10 keV). The photon energy is scanned by using a double-crystal monochromator, the crystal pair of which can be interchanged among KTP(011), InSb(111), Si(111) and Ge(220). The experimental set-up conveniently facilitates XAS measurements in transmission and fluorescence-yield modes at several K-edges of elements ranging from magnesium to zinc. Instrumentation and specification of the beamline and the XAS station are described, together with the determination of the available photon flux [0.1-6 × 10(10) photon s(-1) (100 mA)(-1)], energy resolution (1-5 × 10(-4)) and stability of photon energy calibration (0.07 eV), representing the beamline performance. Data quality and accuracy of XANES and EXAFS measured at BL8 are compared with those of other well established beamlines. A noted distinction of BL8 is its relatively high sensitivity for studying phosphorous, sulfur and chlorine in diluted systems and its maximum beam size of 14 mm (width) × 1 mm (height), which is suitable for bulk characterization.

X-ray and optical spectroscopic study of the coloration of red glass used in 19th century decorative mosaics at the Temple of the Emerald Buddha

“…Cu K-edge (8979 eV) XAS spectra of the red glasses were acquired in fluorescence mode at the beamline BL8 [17] of the Synchrotron Light Research Institute in Nakhon Ratchasima, Thailand. The incident beam is unfocused, monochromated by Ge(220) double crystals, 10 mm in the horizontal and 1 mm in the vertical with flux of about 10 9 photons per second.…”

Evolution of phosphorus speciation with depth in an agricultural soil profile

“…Phosphorus K-edge XANES spectra were collected at beam line BL8 (Klysubun et al, 2012) at the Synchrotron Light Research Institute (SLRI) in Nakhon Ratchasima, Thailand. Prior to XANES analysis, the samples were milled and sieved (b0.05 mm) to minimize self-absorption effects.…”

Influence of Y and La substitution on particle size, structural and magnetic properties of nanosized nickel ferrite prepared by using citrate precursor method

“…The diffraction peaks were modeled by pseudo-Voigt function. X-ray absorption near edge structure spectra (XANES) of the samples NiLa 0.1 Fe 1.9 O 4 and NiY 0.1 Fe 1.9 O 4 and pure standards (ferrous oxide and hematite) were collected in transmission mode at BL8 [23] of the Synchrotron Light Research Institute (Thailand) to determine oxidation state of iron ion in the samples. A double crystal monochromator Ge (220) was used to scan the energy of the synchrotron X-ray beam.…”