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. Author manuscript; available in PMC: 2019 Dec 5.
Published in final edited form as: J Am Chem Soc. 2018 Nov 16;140(48):16807–16820. doi: 10.1021/jacs.8b10313

Figure 3.

Figure 3.

Basic schematic of cryostat and sample arrangement for PFY-EXAFS (A) and HERFD-EXAFS (B) measurements. The PFY detection methodology (A) collects all fluorescence emission events within the set detection energy window, including events from the sample (blue) and background contamination (red). The analyzer crystals of the HERFD-EXAFS setup (B), arranged in a Rowland geometry (C), selects fluorescent events arising from the sample (blue) to the spectrometer detector. The detection of all other fluorescent events (red) is greatly suppressed by the spectrometer as they do not satisfy Braggs’ law of the spectrometer geometry.