High accuracy energy determination and calibration of synchrotron radiation by powder diffraction

► Energy calibration in synchrotron environments where hysteresis is common. ► About 0.1 eV accuracies for a wide range of energy. ► Consecutive runs with the same monochromator and detuning can yield 10-20 sigma discrepancies. ► Offset errors can be critical for comparison to theory and for XANES interpretation. ► Slope errors and offset are significant for XAFS bond lengths and interatomic distances.