The 1Der for pair distribution function analysis

Here we show how the 1Der detector on the Empyrean platform offers real choice, versatility and excellence in Total Scattering measurements for Pair Distribution Function (PDF) analysis. The 1Der detector brings a whole new capability to an Empyrean system which can be configured to provide an all-in-one measurement solution, enabling seamless transition between classic powder X-ray diffraction (XRD) and novel PDF measurements.

By including measurement of disorder in a material, PDF analysis is becoming increasingly widespread and is used as a companion to classic phase analysis with crystal structure refinement, to give a complete view of a material [1]. No material is perfectly crystalline, and scientists are becoming ever more interested in the role that imperfections and amorphous regions play in defining the functional properties of complex crystals [2]. Here we show that, with full digital control of detector length and energy acceptance window, the 1Der can switch seamlessly between configurations and hence facilitate multiple applications on one system.
We demonstrate two experimental set-ups for total scattering measurements on the Empyrean system and show high-quality PDF data using HighScore analysis software. The results on test samples show excellent agreement with known atomic spacings. Together these results illustrate the versatility and performance of the 1Der detector in total scattering experiments.
The examples shown here employ an incident beam slit system, which can be considered as an entry level optic. There are also multiple incident beam options for the Empyrean including focussing mirrors and Bragg BrentanoHD optics, ask your local representative for more information!

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