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A method to calibrate and stabilize the incident X-ray energy for anomalous diffraction data collection is provided and has been successfully used at the single-crystal diffraction beamline 1W2B at the Beijing Synchrotron Radiation Facilities. Employing a feedback loop to control the movement of the double-crystal monochromator, this new method enables the incident X-ray energy to be kept within a 0.2 eV range at the inflection point of the absorption edge.

Supporting information

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Portable Document Format (PDF) file https://doi.org/10.1107/S1600577517006312/rv5065sup1.pdf
Flowcharts of peak-peak monitoring and inflection-peak monitoring of the incident X-ray energy


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