A wavelength dispersive X–ray spectrometer for small area X–ray fluorescence spectroscopy at SPring–8 BL39XU

“…The energy resolution of the von Hamos spectrometer (ÁE VHS ) is determined by three contributions: ÁE D and ÁE cr are the Darwin width and stress-induced intrinsic broadening from the cylindrically bent crystal, respectively, while ÁE G is the angular divergence associated with the finite vertical size of the detector pixel (V pxl ) and the incident X-ray beam at the sample position (V beam ). These are convoluted assuming each of them is in a Gaussian profile for simplicity (Hayakawa et al, 1999),…”

Section: Experimental Setup At the Xss Hutchmentioning

confidence: 99%

Resonant X-ray emission spectroscopy using self-seeded hard X-ray pulses at PAL-XFEL

Choi,

Park,

Kim

et al. 2023

J Synchrotron Radiat

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Self-seeded hard X-ray pulses at PAL-XFEL were used to commission a resonant X-ray emission spectroscopy experiment with a von Hamos spectrometer. The self-seeded beam, generated through forward Bragg diffraction of the [202] peak in a 100 µm-thick diamond crystal, exhibited an average bandwidth of 0.54 eV at 11.223 keV. A coordinated scanning scheme of electron bunch energy, diamond crystal angle and silicon monochromator allowed us to map the Ir Lβ2 X-ray emission lines of IrO2 powder across the Ir L 3-absorption edge, from 11.212 to 11.242 keV with an energy step of 0.3 eV. This work provides a reference for hard X-ray emission spectroscopy experiments utilizing self-seeded pulses with a narrow bandwidth, eventually applicable for pump–probe studies in solid-state and diluted systems.

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“…ΔΘ summarizes any angular deviation from the exact Bragg angle. 29 ΔΘS = s 2 /OP is the angular divergence in the plane of diffraction caused by the finite source size s 2 along the dispersion direction Z. ΔΘD = D/OP is the angular divergence limited by the spatial resolution of the detector D. OP = 2R/sin(Θ B ) is the optical path length between the sample and the detector.…”

Section: Geometrical Contributionmentioning

confidence: 99%