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![[Figure 6]](ok5171fig6mag.jpg)
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Figure 6
Relationship between the measurement time required to acquire an XAFS spectrum in extension of the EXAFS region (spectrum time resolution) and the photon count per point, for different beamlines and measurement types. The photon-energy range is 8.03–9.57 keV (Ni K edge), with 530 points, and the photon count per point is normalized to match the number of points by step-scan XAFS. The region (i) in the figure assumes that there is an overhead of 0.5 s per spectral-measurement point during the monochromator and undulator-gap scanning when the incident X-ray flux is in the range of 1 × 1010–1 × 1013 photons s−1. The regions (ii)–(v) in the figure are classified based on the following references: (ii) QXAFS with DCM at bending magnet (BM) beamlines, or with fixed undulator gap (Nomura et al., 2007  ; Dent et al., 2009; Uruga et al., 2009; Liu et al., 2012; Okajima et al., 2013; Mathon et al., 2015; Tabuchi et al., 2016; Chu et al., 2017); (iii) super QXAFS with CCM at BM/wiggler beamlines (Stötzel et al., 2008; Khalid et al., 2011; Müller et al., 2016); (iv) super QXAFS with CCM, and tapered and fixed undulator gap (Nonaka et al., 2012; Ishiguro et al., 2014, 2016; Ozawa et al., 2018; Caliebe et al., 2019; Bornmann et al., 2019; Uruga et al., 2019); and (v) undulator-gap synchronized QXAFS with DCM (Krempaský et al., 2010; Izquierdo et al., 2012; Chernikov et al., 2016; Hidas et al., 2022). The present work corresponds to the pink star, achieving both the shortest acquisition time and the highest photon flux among reported undulator-gap synchronized QXAFS systems. |
![[Figure 6]](ok5171fig6.jpg)
 | JOURNAL OF SYNCHROTRON RADIATION |
ISSN: 1600-5775
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