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![[Figure 3]](ok5123fig3mag.jpg)
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Figure 3
(a, b) Elastic and (c, d) emission scans for the alignment of the five-analyzer spectrometer with a nominal radius of curvature of 1000 mm. The elastic scans were performed on water and emission scans were performed on Cu foil, using the fourth reflection of Si(111) crystal with the 79.43° Bragg angle. (a) Elastic peaks measured at selected values of the Rowland circle radius, R, showing that large deviations from the optimal value result in peak broadening and reduction in the peak height. (b) Elastic peaks measured at the optimal R for all analyzers. The peaks for each SBCA are normalized by the peak maximum intensity observed in the corresponding scan series (c, d). In (c, d) a similar alignment procedure to the one used for the elastic scans is followed, but these scans display the Cu Kα1 emission peak. (e) The elastic peak maximum intensity as a function of R for all SBCAs. Colored circles show the values obtained from each scan. Solid lines show the third-order polynomial fit of the data. The average of the polynomial fits of all SBCA data (dashed black line) is used to determine the position of the curve maximum, which is used as the optimal R value (dashed blue line). For clarity, all the curves are normalized by the maximum of the corresponding polynomial fits. Panel (f) is the same as (e), but for the Cu Kα1 emission peak. Panels (b), (d), (e), and (f) use the same color scheme to show SBCA-specific data. |
![[Figure 3]](ok5123fig3.jpg)
 | JOURNAL OF SYNCHROTRON RADIATION |
ISSN: 1600-5775
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